Added the following domain attributes for the FSL PAMU driver:
1. Added new iommu stash attribute, which allows setting of the
LIODN specific stash id parameter through IOMMU API.
2. Added an attribute for enabling/disabling DMA to a particular
memory window.
3. Added domain attribute to check for PAMUV1 specific constraints.
Signed-off-by: Varun Sethi <[email protected]>
---
v16 changes:
- rebased to 3.10-rc6
v15 changes:
- Moved fsl_pamu_stash.h under arch/powerpc/include/asm.
v14 changes:
- Add FSL prefix to PAMU attributes.
v13 changes:
- created a new file include/linux/fsl_pamu_stash.h for stash
attributes.
v12 changes:
- Moved PAMU specifc stash ids and structures to PAMU header file.
- no change in v11.
- no change in v10.
arch/powerpc/include/asm/fsl_pamu_stash.h | 39 +++++++++++++++++++++++++++++
include/linux/iommu.h | 16 ++++++++++++
2 files changed, 55 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/include/asm/fsl_pamu_stash.h
diff --git a/arch/powerpc/include/asm/fsl_pamu_stash.h b/arch/powerpc/include/asm/fsl_pamu_stash.h
new file mode 100644
index 0000000..caa1b21
--- /dev/null
+++ b/arch/powerpc/include/asm/fsl_pamu_stash.h
@@ -0,0 +1,39 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ */
+
+#ifndef __FSL_PAMU_STASH_H
+#define __FSL_PAMU_STASH_H
+
+/* cache stash targets */
+enum pamu_stash_target {
+ PAMU_ATTR_CACHE_L1 = 1,
+ PAMU_ATTR_CACHE_L2,
+ PAMU_ATTR_CACHE_L3,
+};
+
+/*
+ * This attribute allows configuring stashig specific parameters
+ * in the PAMU hardware.
+ */
+
+struct pamu_stash_attribute {
+ u32 cpu; /* cpu number */
+ u32 cache; /* cache to stash to: L1,L2,L3 */
+};
+
+#endif /* __FSL_PAMU_STASH_H */
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 3aeb730..7ea319e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -58,10 +58,26 @@ struct iommu_domain {
#define IOMMU_CAP_CACHE_COHERENCY 0x1
#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
+/*
+ * Following constraints are specifc to FSL_PAMUV1:
+ * -aperture must be power of 2, and naturally aligned
+ * -number of windows must be power of 2, and address space size
+ * of each window is determined by aperture size / # of windows
+ * -the actual size of the mapped region of a window must be power
+ * of 2 starting with 4KB and physical address must be naturally
+ * aligned.
+ * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
+ * The caller can invoke iommu_domain_get_attr to check if the underlying
+ * iommu implementation supports these constraints.
+ */
+
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
DOMAIN_ATTR_PAGING,
DOMAIN_ATTR_WINDOWS,
+ DOMAIN_ATTR_FSL_PAMU_STASH,
+ DOMAIN_ATTR_FSL_PAMU_ENABLE,
+ DOMAIN_ATTR_FSL_PAMUV1,
DOMAIN_ATTR_MAX,
};
--
1.7.4.1
Following is a brief description of the PAMU hardware:
PAMU determines what action to take and whether to authorize the action on
the basis of the memory address, a Logical IO Device Number (LIODN), and
PAACT table (logically) indexed by LIODN and address. Hardware devices which
need to access memory must provide an LIODN in addition to the memory address.
Peripheral Access Authorization and Control Tables (PAACTs) are the primary
data structures used by PAMU. A PAACT is a table of peripheral access
authorization and control entries (PAACE).Each PAACE defines the range of
I/O bus address space that is accessible by the LIOD and the associated access
capabilities.
There are two types of PAACTs: primary PAACT (PPAACT) and secondary PAACT
(SPAACT).A given physical I/O device may be able to act as one or more
independent logical I/O devices (LIODs). Each such logical I/O device is
assigned an identifier called logical I/O device number (LIODN). A LIODN is
allocated a contiguous portion of the I/O bus address space called the DSA window
for performing DSA operations. The DSA window may optionally be divided into
multiple sub-windows, each of which may be used to map to a region in system
storage space. The first sub-window is referred to as the primary sub-window
and the remaining are called secondary sub-windows.
This patch provides the PAMU driver (fsl_pamu.c) and the corresponding IOMMU
API implementation (fsl_pamu_domain.c). The PAMU hardware driver (fsl_pamu.c)
has been derived from the work done by Ashish Kalra and Timur Tabi.
Signed-off-by: Timur Tabi <[email protected]>
Signed-off-by: Varun Sethi <[email protected]>
---
changes in v16
- rebased to kernel 3.10-rc6
changes in v15:
- Updated path for fsl_pamu_stash.h.
changes in v14:
- Use updated PAMU specific attributes.
changes in v13:
- Use the new header drivers/iommu/pci.h
- fix geometry configured check.
changes in v12:
- Use is_power_of_2 for checking alignement.
- Check for multifucntion PCI device ACS flags for determining device groups.
- Fix get_stash_id function.
- Don't crash in case of access violations, disable the LIODN.
- Don't use list_empty while traversing list using list for each entry.
- Move stash structure and ids to PAMU header files.
- Fix geometry size calculation.
changes in v11:
- changed iova to dma_addr_t in iova_to_phys API.
changes in v10:
- Support for new guts compatibe string for T4 & B4 devices.
- Modified comment about port ID and mentioned the errata number.
- Fixed the issue where data pointer was not freed in case of a an error.
- Pass data pointer while freeing irq.
- Whle initializing the SPAACE entry clear the valid bit.
changes in v9:
- Merged and createad a single function to delete
a device from domain list.
- Refactored the add_device API code.
- Renamed the paace and spaace init fucntions.
- Renamed functions for mapping windows and subwindows.
- Changed the MAX LIODN value to MAX value u-boot can
program.
- Hard coded maximum number of subwindows.
changes in v8:
- implemented the new API for window based IOMMUs.
changes in v7:
- Set max_subwidows in the geometry attribute.
- Add checking for maximum supported LIODN value.
- Use upper_32_bits and lower_32_bits macros while
intializing PAMU data structures.
changes in v6:
- Simplified complex conditional statements.
- Fixed indentation issues.
- Added comments for IOMMU API implementation.
changes in v5:
- Addressed comments from Timur.
changes in v4:
- Addressed comments from Timur and Scott.
changes in v3:
- Addressed comments by Kumar Gala
- dynamic fspi allocation
- fixed alignment check in map and unmap
arch/powerpc/sysdev/fsl_pci.h | 5 +
drivers/iommu/Kconfig | 10 +
drivers/iommu/Makefile | 1 +
drivers/iommu/fsl_pamu.c | 1309 +++++++++++++++++++++++++++++++++++++++
drivers/iommu/fsl_pamu.h | 410 ++++++++++++
drivers/iommu/fsl_pamu_domain.c | 1142 ++++++++++++++++++++++++++++++++++
drivers/iommu/fsl_pamu_domain.h | 85 +++
7 files changed, 2962 insertions(+), 0 deletions(-)
create mode 100644 drivers/iommu/fsl_pamu.c
create mode 100644 drivers/iommu/fsl_pamu.h
create mode 100644 drivers/iommu/fsl_pamu_domain.c
create mode 100644 drivers/iommu/fsl_pamu_domain.h
diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index 72b5625..1e01291 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h
@@ -16,6 +16,11 @@
struct platform_device;
+
+/* FSL PCI controller BRR1 register */
+#define PCI_FSL_BRR1 0xbf8
+#define PCI_FSL_BRR1_VER 0xffff
+
#define PCIE_LTSSM 0x0404 /* PCIE Link Training and Status */
#define PCIE_LTSSM_L0 0x16 /* L0 state */
#define PCIE_IP_REV_2_2 0x02080202 /* PCIE IP block version Rev2.2 */
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c332fb9..f97db88 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -17,6 +17,16 @@ config OF_IOMMU
def_bool y
depends on OF
+config FSL_PAMU
+ bool "Freescale IOMMU support"
+ depends on PPC_E500MC
+ select IOMMU_API
+ select GENERIC_ALLOCATOR
+ help
+ Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
+ PAMU can authorize memory access, remap the memory address, and remap I/O
+ transaction types.
+
# MSM IOMMU support
config MSM_IOMMU
bool "MSM IOMMU Support"
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index ef0e520..027d1af 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
obj-$(CONFIG_SHMOBILE_IOMMU) += shmobile-iommu.o
obj-$(CONFIG_SHMOBILE_IPMMU) += shmobile-ipmmu.o
+obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
new file mode 100644
index 0000000..d9a27c5
--- /dev/null
+++ b/drivers/iommu/fsl_pamu.c
@@ -0,0 +1,1309 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ */
+
+#define pr_fmt(fmt) "fsl-pamu: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/iommu.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/of_platform.h>
+#include <linux/bootmem.h>
+#include <linux/genalloc.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/fsl_guts.h>
+
+#include "fsl_pamu.h"
+
+/* define indexes for each operation mapping scenario */
+#define OMI_QMAN 0x00
+#define OMI_FMAN 0x01
+#define OMI_QMAN_PRIV 0x02
+#define OMI_CAAM 0x03
+
+#define make64(high, low) (((u64)(high) << 32) | (low))
+
+struct pamu_isr_data {
+ void __iomem *pamu_reg_base; /* Base address of PAMU regs*/
+ unsigned int count; /* The number of PAMUs */
+};
+
+static struct paace *ppaact;
+static struct paace *spaact;
+static struct ome *omt;
+
+/*
+ * Table for matching compatible strings, for device tree
+ * guts node, for QorIQ SOCs.
+ * "fsl,qoriq-device-config-2.0" corresponds to T4 & B4
+ * SOCs. For the older SOCs "fsl,qoriq-device-config-1.0"
+ * string would be used.
+*/
+static const struct of_device_id guts_device_ids[] = {
+ { .compatible = "fsl,qoriq-device-config-1.0", },
+ { .compatible = "fsl,qoriq-device-config-2.0", },
+ {}
+};
+
+
+/*
+ * Table for matching compatible strings, for device tree
+ * L3 cache controller node.
+ * "fsl,t4240-l3-cache-controller" corresponds to T4,
+ * "fsl,b4860-l3-cache-controller" corresponds to B4 &
+ * "fsl,p4080-l3-cache-controller" corresponds to other,
+ * SOCs.
+*/
+static const struct of_device_id l3_device_ids[] = {
+ { .compatible = "fsl,t4240-l3-cache-controller", },
+ { .compatible = "fsl,b4860-l3-cache-controller", },
+ { .compatible = "fsl,p4080-l3-cache-controller", },
+ {}
+};
+
+/* maximum subwindows permitted per liodn */
+static u32 max_subwindow_count;
+
+/* Pool for fspi allocation */
+struct gen_pool *spaace_pool;
+
+/**
+ * pamu_get_max_subwin_cnt() - Return the maximum supported
+ * subwindow count per liodn.
+ *
+ */
+u32 pamu_get_max_subwin_cnt()
+{
+ return max_subwindow_count;
+}
+
+/**
+ * pamu_get_ppaace() - Return the primary PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns the ppace pointer upon success else return
+ * null.
+ */
+static struct paace *pamu_get_ppaace(int liodn)
+{
+ if (!ppaact || liodn >= PAACE_NUMBER_ENTRIES) {
+ pr_err("PPAACT doesn't exist\n");
+ return NULL;
+ }
+
+ return &ppaact[liodn];
+}
+
+/**
+ * pamu_enable_liodn() - Set valid bit of PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_enable_liodn(int liodn)
+{
+ struct paace *ppaace;
+
+ ppaace = pamu_get_ppaace(liodn);
+ if (!ppaace) {
+ pr_err("Invalid primary paace entry\n");
+ return -ENOENT;
+ }
+
+ if (!get_bf(ppaace->addr_bitfields, PPAACE_AF_WSE)) {
+ pr_err("liodn %d not configured\n", liodn);
+ return -EINVAL;
+ }
+
+ /* Ensure that all other stores to the ppaace complete first */
+ mb();
+
+ set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
+ mb();
+
+ return 0;
+}
+
+/**
+ * pamu_disable_liodn() - Clears valid bit of PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_disable_liodn(int liodn)
+{
+ struct paace *ppaace;
+
+ ppaace = pamu_get_ppaace(liodn);
+ if (!ppaace) {
+ pr_err("Invalid primary paace entry\n");
+ return -ENOENT;
+ }
+
+ set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
+ mb();
+
+ return 0;
+}
+
+/* Derive the window size encoding for a particular PAACE entry */
+static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
+{
+ /* Bug if not a power of 2 */
+ BUG_ON(!is_power_of_2(addrspace_size));
+
+ /* window size is 2^(WSE+1) bytes */
+ return __ffs(addrspace_size) - 1;
+}
+
+/* Derive the PAACE window count encoding for the subwindow count */
+static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
+{
+ /* window count is 2^(WCE+1) bytes */
+ return __ffs(subwindow_cnt) - 1;
+}
+
+/*
+ * Set the PAACE type as primary and set the coherency required domain
+ * attribute
+ */
+static void pamu_init_ppaace(struct paace *ppaace)
+{
+ set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
+
+ set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+ PAACE_M_COHERENCE_REQ);
+}
+
+/*
+ * Set the PAACE type as secondary and set the coherency required domain
+ * attribute.
+ */
+static void pamu_init_spaace(struct paace *spaace)
+{
+ set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
+ set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+ PAACE_M_COHERENCE_REQ);
+}
+
+/*
+ * Return the spaace (corresponding to the secondary window index)
+ * for a particular ppaace.
+ */
+static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
+{
+ u32 subwin_cnt;
+ struct paace *spaace = NULL;
+
+ subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);
+
+ if (wnum < subwin_cnt)
+ spaace = &spaact[paace->fspi + wnum];
+ else
+ pr_err("secondary paace out of bounds\n");
+
+ return spaace;
+}
+
+/**
+ * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
+ * required for primary PAACE in the secondary
+ * PAACE table.
+ * @subwin_cnt: Number of subwindows to be reserved.
+ *
+ * A PPAACE entry may have a number of associated subwindows. A subwindow
+ * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
+ * the index (fspi) of the first SPAACE entry in the SPAACT table. This
+ * function returns the index of the first SPAACE entry. The remaining
+ * SPAACE entries are reserved contiguously from that index.
+ *
+ * Returns a valid fspi index in the range of 0 - SPAACE_NUMBER_ENTRIES on success.
+ * If no SPAACE entry is available or the allocator can not reserve the required
+ * number of contiguous entries function returns ULONG_MAX indicating a failure.
+ *
+*/
+static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
+{
+ unsigned long spaace_addr;
+
+ spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
+ if (!spaace_addr)
+ return ULONG_MAX;
+
+ return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
+}
+
+/* Release the subwindows reserved for a particular LIODN */
+void pamu_free_subwins(int liodn)
+{
+ struct paace *ppaace;
+ u32 subwin_cnt, size;
+
+ ppaace = pamu_get_ppaace(liodn);
+ if (!ppaace) {
+ pr_err("Invalid liodn entry\n");
+ return;
+ }
+
+ if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
+ subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
+ size = (subwin_cnt - 1) * sizeof(struct paace);
+ gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
+ }
+}
+
+/*
+ * Function used for updating stash destination for the coressponding
+ * LIODN.
+ */
+int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
+{
+ struct paace *paace;
+
+ paace = pamu_get_ppaace(liodn);
+ if (!paace) {
+ pr_err("Invalid liodn entry\n");
+ return -ENOENT;
+ }
+ if (subwin) {
+ paace = pamu_get_spaace(paace, subwin - 1);
+ if (!paace) {
+ return -ENOENT;
+ }
+ }
+ set_bf(paace->impl_attr, PAACE_IA_CID, value);
+
+ mb();
+
+ return 0;
+}
+
+/* Disable a subwindow corresponding to the LIODN */
+int pamu_disable_spaace(int liodn, u32 subwin)
+{
+ struct paace *paace;
+
+ paace = pamu_get_ppaace(liodn);
+ if (!paace) {
+ pr_err("Invalid liodn entry\n");
+ return -ENOENT;
+ }
+ if (subwin) {
+ paace = pamu_get_spaace(paace, subwin - 1);
+ if (!paace) {
+ return -ENOENT;
+ }
+ set_bf(paace->addr_bitfields, PAACE_AF_V,
+ PAACE_V_INVALID);
+ } else {
+ set_bf(paace->addr_bitfields, PAACE_AF_AP,
+ PAACE_AP_PERMS_DENIED);
+ }
+
+ mb();
+
+ return 0;
+}
+
+
+/**
+ * pamu_config_paace() - Sets up PPAACE entry for specified liodn
+ *
+ * @liodn: Logical IO device number
+ * @win_addr: starting address of DSA window
+ * @win-size: size of DSA window
+ * @omi: Operation mapping index -- if ~omi == 0 then omi not defined
+ * @rpn: real (true physical) page number
+ * @stashid: cache stash id for associated cpu -- if ~stashid == 0 then
+ * stashid not defined
+ * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
+ * snoopid not defined
+ * @subwin_cnt: number of sub-windows
+ * @prot: window permissions
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
+ u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
+ u32 subwin_cnt, int prot)
+{
+ struct paace *ppaace;
+ unsigned long fspi;
+
+ if (!is_power_of_2(win_size) || win_size < PAMU_PAGE_SIZE) {
+ pr_err("window size too small or not a power of two %llx\n", win_size);
+ return -EINVAL;
+ }
+
+ if (win_addr & (win_size - 1)) {
+ pr_err("window address is not aligned with window size\n");
+ return -EINVAL;
+ }
+
+ ppaace = pamu_get_ppaace(liodn);
+ if (!ppaace) {
+ return -ENOENT;
+ }
+
+ /* window size is 2^(WSE+1) bytes */
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE,
+ map_addrspace_size_to_wse(win_size));
+
+ pamu_init_ppaace(ppaace);
+
+ ppaace->wbah = win_addr >> (PAMU_PAGE_SHIFT + 20);
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL,
+ (win_addr >> PAMU_PAGE_SHIFT));
+
+ /* set up operation mapping if it's configured */
+ if (omi < OME_NUMBER_ENTRIES) {
+ set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+ ppaace->op_encode.index_ot.omi = omi;
+ } else if (~omi != 0) {
+ pr_err("bad operation mapping index: %d\n", omi);
+ return -EINVAL;
+ }
+
+ /* configure stash id */
+ if (~stashid != 0)
+ set_bf(ppaace->impl_attr, PAACE_IA_CID, stashid);
+
+ /* configure snoop id */
+ if (~snoopid != 0)
+ ppaace->domain_attr.to_host.snpid = snoopid;
+
+ if (subwin_cnt) {
+ /* The first entry is in the primary PAACE instead */
+ fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
+ if (fspi == ULONG_MAX) {
+ pr_err("spaace indexes exhausted\n");
+ return -EINVAL;
+ }
+
+ /* window count is 2^(WCE+1) bytes */
+ set_bf(ppaace->impl_attr, PAACE_IA_WCE,
+ map_subwindow_cnt_to_wce(subwin_cnt));
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0x1);
+ ppaace->fspi = fspi;
+ } else {
+ set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
+ ppaace->twbah = rpn >> 20;
+ set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
+ set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
+ set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
+ }
+ mb();
+
+ return 0;
+}
+
+/**
+ * pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
+ *
+ * @liodn: Logical IO device number
+ * @subwin_cnt: number of sub-windows associated with dma-window
+ * @subwin: subwindow index
+ * @subwin_size: size of subwindow
+ * @omi: Operation mapping index
+ * @rpn: real (true physical) page number
+ * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
+ * snoopid not defined
+ * @stashid: cache stash id for associated cpu
+ * @enable: enable/disable subwindow after reconfiguration
+ * @prot: sub window permissions
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
+ phys_addr_t subwin_size, u32 omi, unsigned long rpn,
+ u32 snoopid, u32 stashid, int enable, int prot)
+{
+ struct paace *paace;
+
+
+ /* setup sub-windows */
+ if (!subwin_cnt) {
+ pr_err("Invalid subwindow count\n");
+ return -EINVAL;
+ }
+
+ paace = pamu_get_ppaace(liodn);
+ if (subwin > 0 && subwin < subwin_cnt && paace) {
+ paace = pamu_get_spaace(paace, subwin - 1);
+
+ if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
+ pamu_init_spaace(paace);
+ set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
+ }
+ }
+
+ if (!paace) {
+ pr_err("Invalid liodn entry\n");
+ return -ENOENT;
+ }
+
+ if (!is_power_of_2(subwin_size) || subwin_size < PAMU_PAGE_SIZE) {
+ pr_err("subwindow size out of range, or not a power of 2\n");
+ return -EINVAL;
+ }
+
+ if (rpn == ULONG_MAX) {
+ pr_err("real page number out of range\n");
+ return -EINVAL;
+ }
+
+ /* window size is 2^(WSE+1) bytes */
+ set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
+ map_addrspace_size_to_wse(subwin_size));
+
+ set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
+ paace->twbah = rpn >> 20;
+ set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
+ set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
+
+ /* configure snoop id */
+ if (~snoopid != 0)
+ paace->domain_attr.to_host.snpid = snoopid;
+
+ /* set up operation mapping if it's configured */
+ if (omi < OME_NUMBER_ENTRIES) {
+ set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+ paace->op_encode.index_ot.omi = omi;
+ } else if (~omi != 0) {
+ pr_err("bad operation mapping index: %d\n", omi);
+ return -EINVAL;
+ }
+
+ if (~stashid != 0)
+ set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
+
+ smp_wmb();
+
+ if (enable)
+ set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
+
+ mb();
+
+ return 0;
+}
+
+/**
+* get_ome_index() - Returns the index in the operation mapping table
+* for device.
+* @*omi_index: pointer for storing the index value
+*
+*/
+void get_ome_index(u32 *omi_index, struct device *dev)
+{
+ if (of_device_is_compatible(dev->of_node, "fsl,qman-portal"))
+ *omi_index = OMI_QMAN;
+ if (of_device_is_compatible(dev->of_node, "fsl,qman"))
+ *omi_index = OMI_QMAN_PRIV;
+}
+
+/**
+ * get_stash_id - Returns stash destination id corresponding to a
+ * cache type and vcpu.
+ * @stash_dest_hint: L1, L2 or L3
+ * @vcpu: vpcu target for a particular cache type.
+ *
+ * Returs stash on success or ~(u32)0 on failure.
+ *
+ */
+u32 get_stash_id(u32 stash_dest_hint, u32 vcpu)
+{
+ const u32 *prop;
+ struct device_node *node;
+ u32 cache_level;
+ int len, found = 0;
+ int i;
+
+ /* Fastpath, exit early if L3/CPC cache is target for stashing */
+ if (stash_dest_hint == PAMU_ATTR_CACHE_L3) {
+ node = of_find_matching_node(NULL, l3_device_ids);
+ if (node) {
+ prop = of_get_property(node, "cache-stash-id", 0);
+ if (!prop) {
+ pr_err("missing cache-stash-id at %s\n", node->full_name);
+ of_node_put(node);
+ return ~(u32)0;
+ }
+ of_node_put(node);
+ return be32_to_cpup(prop);
+ }
+ return ~(u32)0;
+ }
+
+ for_each_node_by_type(node, "cpu") {
+ prop = of_get_property(node, "reg", &len);
+ for (i = 0; i < len / sizeof(u32); i++) {
+ if (be32_to_cpup(&prop[i]) == vcpu) {
+ found = 1;
+ goto found_cpu_node;
+ }
+ }
+ }
+found_cpu_node:
+
+ /* find the hwnode that represents the cache */
+ for (cache_level = PAMU_ATTR_CACHE_L1; (cache_level < PAMU_ATTR_CACHE_L3) && found; cache_level++) {
+ if (stash_dest_hint == cache_level) {
+ prop = of_get_property(node, "cache-stash-id", 0);
+ if (!prop) {
+ pr_err("missing cache-stash-id at %s\n", node->full_name);
+ of_node_put(node);
+ return ~(u32)0;
+ }
+ of_node_put(node);
+ return be32_to_cpup(prop);
+ }
+
+ prop = of_get_property(node, "next-level-cache", 0);
+ if (!prop) {
+ pr_err("can't find next-level-cache at %s\n",
+ node->full_name);
+ of_node_put(node);
+ return ~(u32)0; /* can't traverse any further */
+ }
+ of_node_put(node);
+
+ /* advance to next node in cache hierarchy */
+ node = of_find_node_by_phandle(*prop);
+ if (!node) {
+ pr_err("Invalid node for cache hierarchy %s\n",
+ node->full_name);
+ return ~(u32)0;
+ }
+ }
+
+ pr_err("stash dest not found for %d on vcpu %d\n",
+ stash_dest_hint, vcpu);
+ return ~(u32)0;
+}
+
+/* Identify if the PAACT table entry belongs to QMAN, BMAN or QMAN Portal */
+#define QMAN_PAACE 1
+#define QMAN_PORTAL_PAACE 2
+#define BMAN_PAACE 3
+
+/**
+ * Setup operation mapping and stash destinations for QMAN and QMAN portal.
+ * Memory accesses to QMAN and BMAN private memory need not be coherent, so
+ * clear the PAACE entry coherency attribute for them.
+ */
+static void setup_qbman_paace(struct paace *ppaace, int paace_type)
+{
+ switch (paace_type) {
+ case QMAN_PAACE:
+ set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+ ppaace->op_encode.index_ot.omi = OMI_QMAN_PRIV;
+ /* setup QMAN Private data stashing for the L3 cache */
+ set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
+ set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+ 0);
+ break;
+ case QMAN_PORTAL_PAACE:
+ set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+ ppaace->op_encode.index_ot.omi = OMI_QMAN;
+ /*Set DQRR and Frame stashing for the L3 cache */
+ set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
+ break;
+ case BMAN_PAACE:
+ set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+ 0);
+ break;
+ }
+}
+
+/**
+ * Setup the operation mapping table for various devices. This is a static
+ * table where each table index corresponds to a particular device. PAMU uses
+ * this table to translate device transaction to appropriate corenet
+ * transaction.
+ */
+static void __init setup_omt(struct ome *omt)
+{
+ struct ome *ome;
+
+ /* Configure OMI_QMAN */
+ ome = &omt[OMI_QMAN];
+
+ ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
+ ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
+ ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+ ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSAO;
+
+ ome->moe[IOE_DIRECT0_IDX] = EOE_VALID | EOE_LDEC;
+ ome->moe[IOE_DIRECT1_IDX] = EOE_VALID | EOE_LDECPE;
+
+ /* Configure OMI_FMAN */
+ ome = &omt[OMI_FMAN];
+ ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
+ ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+
+ /* Configure OMI_QMAN private */
+ ome = &omt[OMI_QMAN_PRIV];
+ ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
+ ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+ ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
+ ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSA;
+
+ /* Configure OMI_CAAM */
+ ome = &omt[OMI_CAAM];
+ ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
+ ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+}
+
+/*
+ * Get the maximum number of PAACT table entries
+ * and subwindows supported by PAMU
+ */
+static void get_pamu_cap_values(unsigned long pamu_reg_base)
+{
+ u32 pc_val;
+
+ pc_val = in_be32((u32 *)(pamu_reg_base + PAMU_PC3));
+ /* Maximum number of subwindows per liodn */
+ max_subwindow_count = 1 << (1 + PAMU_PC3_MWCE(pc_val));
+}
+
+/* Setup PAMU registers pointing to PAACT, SPAACT and OMT */
+int setup_one_pamu(unsigned long pamu_reg_base, unsigned long pamu_reg_size,
+ phys_addr_t ppaact_phys, phys_addr_t spaact_phys,
+ phys_addr_t omt_phys)
+{
+ u32 *pc;
+ struct pamu_mmap_regs *pamu_regs;
+
+ pc = (u32 *) (pamu_reg_base + PAMU_PC);
+ pamu_regs = (struct pamu_mmap_regs *)
+ (pamu_reg_base + PAMU_MMAP_REGS_BASE);
+
+ /* set up pointers to corenet control blocks */
+
+ out_be32(&pamu_regs->ppbah, upper_32_bits(ppaact_phys));
+ out_be32(&pamu_regs->ppbal, lower_32_bits(ppaact_phys));
+ ppaact_phys = ppaact_phys + PAACT_SIZE;
+ out_be32(&pamu_regs->pplah, upper_32_bits(ppaact_phys));
+ out_be32(&pamu_regs->pplal, lower_32_bits(ppaact_phys));
+
+ out_be32(&pamu_regs->spbah, upper_32_bits(spaact_phys));
+ out_be32(&pamu_regs->spbal, lower_32_bits(spaact_phys));
+ spaact_phys = spaact_phys + SPAACT_SIZE;
+ out_be32(&pamu_regs->splah, upper_32_bits(spaact_phys));
+ out_be32(&pamu_regs->splal, lower_32_bits(spaact_phys));
+
+ out_be32(&pamu_regs->obah, upper_32_bits(omt_phys));
+ out_be32(&pamu_regs->obal, lower_32_bits(omt_phys));
+ omt_phys = omt_phys + OMT_SIZE;
+ out_be32(&pamu_regs->olah, upper_32_bits(omt_phys));
+ out_be32(&pamu_regs->olal, lower_32_bits(omt_phys));
+
+ /*
+ * set PAMU enable bit,
+ * allow ppaact & omt to be cached
+ * & enable PAMU access violation interrupts.
+ */
+
+ out_be32((u32 *)(pamu_reg_base + PAMU_PICS),
+ PAMU_ACCESS_VIOLATION_ENABLE);
+ out_be32(pc, PAMU_PC_PE | PAMU_PC_OCE | PAMU_PC_SPCC | PAMU_PC_PPCC);
+ return 0;
+}
+
+/* Enable all device LIODNS */
+static void __init setup_liodns(void)
+{
+ int i, len;
+ struct paace *ppaace;
+ struct device_node *node = NULL;
+ const u32 *prop;
+
+ for_each_node_with_property(node, "fsl,liodn") {
+ prop = of_get_property(node, "fsl,liodn", &len);
+ for (i = 0; i < len / sizeof(u32); i++) {
+ int liodn;
+
+ liodn = be32_to_cpup(&prop[i]);
+ if (liodn >= PAACE_NUMBER_ENTRIES) {
+ pr_err("Invalid LIODN value %d\n", liodn);
+ continue;
+ }
+ ppaace = pamu_get_ppaace(liodn);
+ pamu_init_ppaace(ppaace);
+ /* window size is 2^(WSE+1) bytes */
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE, 35);
+ ppaace->wbah = 0;
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL, 0);
+ set_bf(ppaace->impl_attr, PAACE_IA_ATM,
+ PAACE_ATM_NO_XLATE);
+ set_bf(ppaace->addr_bitfields, PAACE_AF_AP,
+ PAACE_AP_PERMS_ALL);
+ if (of_device_is_compatible(node, "fsl,qman-portal"))
+ setup_qbman_paace(ppaace, QMAN_PORTAL_PAACE);
+ if (of_device_is_compatible(node, "fsl,qman"))
+ setup_qbman_paace(ppaace, QMAN_PAACE);
+ if (of_device_is_compatible(node, "fsl,bman"))
+ setup_qbman_paace(ppaace, BMAN_PAACE);
+ mb();
+ pamu_enable_liodn(liodn);
+ }
+ }
+}
+
+irqreturn_t pamu_av_isr(int irq, void *arg)
+{
+ struct pamu_isr_data *data = arg;
+ phys_addr_t phys;
+ unsigned int i, j, ret;
+
+ pr_emerg("fsl-pamu: access violation interrupt\n");
+
+ for (i = 0; i < data->count; i++) {
+ void __iomem *p = data->pamu_reg_base + i * PAMU_OFFSET;
+ u32 pics = in_be32(p + PAMU_PICS);
+
+ if (pics & PAMU_ACCESS_VIOLATION_STAT) {
+ u32 avs1 = in_be32(p + PAMU_AVS1);
+ struct paace *paace;
+
+ pr_emerg("POES1=%08x\n", in_be32(p + PAMU_POES1));
+ pr_emerg("POES2=%08x\n", in_be32(p + PAMU_POES2));
+ pr_emerg("AVS1=%08x\n", avs1);
+ pr_emerg("AVS2=%08x\n", in_be32(p + PAMU_AVS2));
+ pr_emerg("AVA=%016llx\n", make64(in_be32(p + PAMU_AVAH),
+ in_be32(p + PAMU_AVAL)));
+ pr_emerg("UDAD=%08x\n", in_be32(p + PAMU_UDAD));
+ pr_emerg("POEA=%016llx\n", make64(in_be32(p + PAMU_POEAH),
+ in_be32(p + PAMU_POEAL)));
+
+ phys = make64(in_be32(p + PAMU_POEAH),
+ in_be32(p + PAMU_POEAL));
+
+ /* Assume that POEA points to a PAACE */
+ if (phys) {
+ u32 *paace = phys_to_virt(phys);
+
+ /* Only the first four words are relevant */
+ for (j = 0; j < 4; j++)
+ pr_emerg("PAACE[%u]=%08x\n", j, in_be32(paace + j));
+ }
+
+ /* clear access violation condition */
+ out_be32((p + PAMU_AVS1), avs1 & PAMU_AV_MASK);
+ paace = pamu_get_ppaace(avs1 >> PAMU_AVS1_LIODN_SHIFT);
+ BUG_ON(!paace);
+ /* check if we got a violation for a disabled LIODN */
+ if (!get_bf(paace->addr_bitfields, PAACE_AF_V)) {
+ /*
+ * As per hardware erratum A-003638, access
+ * violation can be reported for a disabled
+ * LIODN. If we hit that condition, disable
+ * access violation reporting.
+ */
+ pics &= ~PAMU_ACCESS_VIOLATION_ENABLE;
+ } else {
+ /* Disable the LIODN */
+ ret = pamu_disable_liodn(avs1 >> PAMU_AVS1_LIODN_SHIFT);
+ BUG_ON(ret);
+ pr_emerg("Disabling liodn %x\n", avs1 >> PAMU_AVS1_LIODN_SHIFT);
+ }
+ out_be32((p + PAMU_PICS), pics);
+ }
+ }
+
+
+ return IRQ_HANDLED;
+}
+
+#define LAWAR_EN 0x80000000
+#define LAWAR_TARGET_MASK 0x0FF00000
+#define LAWAR_TARGET_SHIFT 20
+#define LAWAR_SIZE_MASK 0x0000003F
+#define LAWAR_CSDID_MASK 0x000FF000
+#define LAWAR_CSDID_SHIFT 12
+
+#define LAW_SIZE_4K 0xb
+
+struct ccsr_law {
+ u32 lawbarh; /* LAWn base address high */
+ u32 lawbarl; /* LAWn base address low */
+ u32 lawar; /* LAWn attributes */
+ u32 reserved;
+};
+
+/*
+ * Create a coherence subdomain for a given memory block.
+ */
+static int __init create_csd(phys_addr_t phys, size_t size, u32 csd_port_id)
+{
+ struct device_node *np;
+ const __be32 *iprop;
+ void __iomem *lac = NULL; /* Local Access Control registers */
+ struct ccsr_law __iomem *law;
+ void __iomem *ccm = NULL;
+ u32 __iomem *csdids;
+ unsigned int i, num_laws, num_csds;
+ u32 law_target = 0;
+ u32 csd_id = 0;
+ int ret = 0;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,corenet-law");
+ if (!np)
+ return -ENODEV;
+
+ iprop = of_get_property(np, "fsl,num-laws", NULL);
+ if (!iprop) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ num_laws = be32_to_cpup(iprop);
+ if (!num_laws) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ lac = of_iomap(np, 0);
+ if (!lac) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ /* LAW registers are at offset 0xC00 */
+ law = lac + 0xC00;
+
+ of_node_put(np);
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,corenet-cf");
+ if (!np) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ iprop = of_get_property(np, "fsl,ccf-num-csdids", NULL);
+ if (!iprop) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ num_csds = be32_to_cpup(iprop);
+ if (!num_csds) {
+ ret = -ENODEV;
+ goto error;
+ }
+
+ ccm = of_iomap(np, 0);
+ if (!ccm) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ /* The undocumented CSDID registers are at offset 0x600 */
+ csdids = ccm + 0x600;
+
+ of_node_put(np);
+ np = NULL;
+
+ /* Find an unused coherence subdomain ID */
+ for (csd_id = 0; csd_id < num_csds; csd_id++) {
+ if (!csdids[csd_id])
+ break;
+ }
+
+ /* Store the Port ID in the (undocumented) proper CIDMRxx register */
+ csdids[csd_id] = csd_port_id;
+
+ /* Find the DDR LAW that maps to our buffer. */
+ for (i = 0; i < num_laws; i++) {
+ if (law[i].lawar & LAWAR_EN) {
+ phys_addr_t law_start, law_end;
+
+ law_start = make64(law[i].lawbarh, law[i].lawbarl);
+ law_end = law_start +
+ (2ULL << (law[i].lawar & LAWAR_SIZE_MASK));
+
+ if (law_start <= phys && phys < law_end) {
+ law_target = law[i].lawar & LAWAR_TARGET_MASK;
+ break;
+ }
+ }
+ }
+
+ if (i == 0 || i == num_laws) {
+ /* This should never happen*/
+ ret = -ENOENT;
+ goto error;
+ }
+
+ /* Find a free LAW entry */
+ while (law[--i].lawar & LAWAR_EN) {
+ if (i == 0) {
+ /* No higher priority LAW slots available */
+ ret = -ENOENT;
+ goto error;
+ }
+ }
+
+ law[i].lawbarh = upper_32_bits(phys);
+ law[i].lawbarl = lower_32_bits(phys);
+ wmb();
+ law[i].lawar = LAWAR_EN | law_target | (csd_id << LAWAR_CSDID_SHIFT) |
+ (LAW_SIZE_4K + get_order(size));
+ wmb();
+
+error:
+ if (ccm)
+ iounmap(ccm);
+
+ if (lac)
+ iounmap(lac);
+
+ if (np)
+ of_node_put(np);
+
+ return ret;
+}
+
+/*
+ * Table of SVRs and the corresponding PORT_ID values. Port ID corresponds to a
+ * bit map of snoopers for a given range of memory mapped by a LAW.
+ *
+ * All future CoreNet-enabled SOCs will have this erratum(A-004510) fixed, so this
+ * table should never need to be updated. SVRs are guaranteed to be unique, so
+ * there is no worry that a future SOC will inadvertently have one of these
+ * values.
+ */
+static const struct {
+ u32 svr;
+ u32 port_id;
+} port_id_map[] = {
+ {0x82100010, 0xFF000000}, /* P2040 1.0 */
+ {0x82100011, 0xFF000000}, /* P2040 1.1 */
+ {0x82100110, 0xFF000000}, /* P2041 1.0 */
+ {0x82100111, 0xFF000000}, /* P2041 1.1 */
+ {0x82110310, 0xFF000000}, /* P3041 1.0 */
+ {0x82110311, 0xFF000000}, /* P3041 1.1 */
+ {0x82010020, 0xFFF80000}, /* P4040 2.0 */
+ {0x82000020, 0xFFF80000}, /* P4080 2.0 */
+ {0x82210010, 0xFC000000}, /* P5010 1.0 */
+ {0x82210020, 0xFC000000}, /* P5010 2.0 */
+ {0x82200010, 0xFC000000}, /* P5020 1.0 */
+ {0x82050010, 0xFF800000}, /* P5021 1.0 */
+ {0x82040010, 0xFF800000}, /* P5040 1.0 */
+};
+
+#define SVR_SECURITY 0x80000 /* The Security (E) bit */
+
+static int __init fsl_pamu_probe(struct platform_device *pdev)
+{
+ void __iomem *pamu_regs = NULL;
+ struct ccsr_guts __iomem *guts_regs = NULL;
+ u32 pamubypenr, pamu_counter;
+ unsigned long pamu_reg_off;
+ unsigned long pamu_reg_base;
+ struct pamu_isr_data *data = NULL;
+ struct device_node *guts_node;
+ u64 size;
+ struct page *p;
+ int ret = 0;
+ int irq;
+ phys_addr_t ppaact_phys;
+ phys_addr_t spaact_phys;
+ phys_addr_t omt_phys;
+ size_t mem_size = 0;
+ unsigned int order = 0;
+ u32 csd_port_id = 0;
+ unsigned i;
+ /*
+ * enumerate all PAMUs and allocate and setup PAMU tables
+ * for each of them,
+ * NOTE : All PAMUs share the same LIODN tables.
+ */
+
+ pamu_regs = of_iomap(pdev->dev.of_node, 0);
+ if (!pamu_regs) {
+ dev_err(&pdev->dev, "ioremap of PAMU node failed\n");
+ return -ENOMEM;
+ }
+ of_get_address(pdev->dev.of_node, 0, &size, NULL);
+
+ irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (irq == NO_IRQ) {
+ dev_warn(&pdev->dev, "no interrupts listed in PAMU node\n");
+ goto error;
+ }
+
+ data = kzalloc(sizeof(struct pamu_isr_data), GFP_KERNEL);
+ if (!data) {
+ dev_err(&pdev->dev, "PAMU isr data memory allocation failed\n");
+ ret = -ENOMEM;
+ goto error;
+ }
+ data->pamu_reg_base = pamu_regs;
+ data->count = size / PAMU_OFFSET;
+
+ /* The ISR needs access to the regs, so we won't iounmap them */
+ ret = request_irq(irq, pamu_av_isr, 0, "pamu", data);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "error %i installing ISR for irq %i\n",
+ ret, irq);
+ goto error;
+ }
+
+ guts_node = of_find_matching_node(NULL, guts_device_ids);
+ if (!guts_node) {
+ dev_err(&pdev->dev, "could not find GUTS node %s\n",
+ pdev->dev.of_node->full_name);
+ ret = -ENODEV;
+ goto error;
+ }
+
+ guts_regs = of_iomap(guts_node, 0);
+ of_node_put(guts_node);
+ if (!guts_regs) {
+ dev_err(&pdev->dev, "ioremap of GUTS node failed\n");
+ ret = -ENODEV;
+ goto error;
+ }
+
+ /* read in the PAMU capability registers */
+ get_pamu_cap_values((unsigned long)pamu_regs);
+ /*
+ * To simplify the allocation of a coherency domain, we allocate the
+ * PAACT and the OMT in the same memory buffer. Unfortunately, this
+ * wastes more memory compared to allocating the buffers separately.
+ */
+ /* Determine how much memory we need */
+ mem_size = (PAGE_SIZE << get_order(PAACT_SIZE)) +
+ (PAGE_SIZE << get_order(SPAACT_SIZE)) +
+ (PAGE_SIZE << get_order(OMT_SIZE));
+ order = get_order(mem_size);
+
+ p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!p) {
+ dev_err(&pdev->dev, "unable to allocate PAACT/SPAACT/OMT block\n");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ ppaact = page_address(p);
+ ppaact_phys = page_to_phys(p);
+
+ /* Make sure the memory is naturally aligned */
+ if (ppaact_phys & ((PAGE_SIZE << order) - 1)) {
+ dev_err(&pdev->dev, "PAACT/OMT block is unaligned\n");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ spaact = (void *)ppaact + (PAGE_SIZE << get_order(PAACT_SIZE));
+ omt = (void *)spaact + (PAGE_SIZE << get_order(SPAACT_SIZE));
+
+ dev_dbg(&pdev->dev, "ppaact virt=%p phys=0x%llx\n", ppaact,
+ (unsigned long long) ppaact_phys);
+
+ /* Check to see if we need to implement the work-around on this SOC */
+
+ /* Determine the Port ID for our coherence subdomain */
+ for (i = 0; i < ARRAY_SIZE(port_id_map); i++) {
+ if (port_id_map[i].svr == (mfspr(SPRN_SVR) & ~SVR_SECURITY)) {
+ csd_port_id = port_id_map[i].port_id;
+ dev_dbg(&pdev->dev, "found matching SVR %08x\n",
+ port_id_map[i].svr);
+ break;
+ }
+ }
+
+ if (csd_port_id) {
+ dev_dbg(&pdev->dev, "creating coherency subdomain at address "
+ "0x%llx, size %zu, port id 0x%08x", ppaact_phys,
+ mem_size, csd_port_id);
+
+ ret = create_csd(ppaact_phys, mem_size, csd_port_id);
+ if (ret) {
+ dev_err(&pdev->dev, "could not create coherence "
+ "subdomain\n");
+ return ret;
+ }
+ }
+
+ spaact_phys = virt_to_phys(spaact);
+ omt_phys = virt_to_phys(omt);
+
+ spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1);
+ if (!spaace_pool) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "PAMU : failed to allocate spaace gen pool\n");
+ goto error;
+ }
+
+ ret = gen_pool_add(spaace_pool, (unsigned long)spaact, SPAACT_SIZE, -1);
+ if (ret)
+ goto error_genpool;
+
+ pamubypenr = in_be32(&guts_regs->pamubypenr);
+
+ for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < size;
+ pamu_reg_off += PAMU_OFFSET, pamu_counter >>= 1) {
+
+ pamu_reg_base = (unsigned long) pamu_regs + pamu_reg_off;
+ setup_one_pamu(pamu_reg_base, pamu_reg_off, ppaact_phys,
+ spaact_phys, omt_phys);
+ /* Disable PAMU bypass for this PAMU */
+ pamubypenr &= ~pamu_counter;
+ }
+
+ setup_omt(omt);
+
+ /* Enable all relevant PAMU(s) */
+ out_be32(&guts_regs->pamubypenr, pamubypenr);
+
+ iounmap(guts_regs);
+
+ /* Enable DMA for the LIODNs in the device tree*/
+
+ setup_liodns();
+
+ return 0;
+
+error_genpool:
+ gen_pool_destroy(spaace_pool);
+
+error:
+ if (irq != NO_IRQ)
+ free_irq(irq, data);
+
+ if (data) {
+ memset(data, 0, sizeof(struct pamu_isr_data));
+ kfree(data);
+ }
+
+ if (pamu_regs)
+ iounmap(pamu_regs);
+
+ if (guts_regs)
+ iounmap(guts_regs);
+
+ if (ppaact)
+ free_pages((unsigned long)ppaact, order);
+
+ ppaact = NULL;
+
+ return ret;
+}
+
+static const struct of_device_id fsl_of_pamu_ids[] = {
+ {
+ .compatible = "fsl,p4080-pamu",
+ },
+ {
+ .compatible = "fsl,pamu",
+ },
+ {},
+};
+
+static struct platform_driver fsl_of_pamu_driver = {
+ .driver = {
+ .name = "fsl-of-pamu",
+ .owner = THIS_MODULE,
+ },
+ .probe = fsl_pamu_probe,
+};
+
+static __init int fsl_pamu_init(void)
+{
+ struct platform_device *pdev = NULL;
+ struct device_node *np;
+ int ret;
+
+ /*
+ * The normal OF process calls the probe function at some
+ * indeterminate later time, after most drivers have loaded. This is
+ * too late for us, because PAMU clients (like the Qman driver)
+ * depend on PAMU being initialized early.
+ *
+ * So instead, we "manually" call our probe function by creating the
+ * platform devices ourselves.
+ */
+
+ /*
+ * We assume that there is only one PAMU node in the device tree. A
+ * single PAMU node represents all of the PAMU devices in the SOC
+ * already. Everything else already makes that assumption, and the
+ * binding for the PAMU nodes doesn't allow for any parent-child
+ * relationships anyway. In other words, support for more than one
+ * PAMU node would require significant changes to a lot of code.
+ */
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,pamu");
+ if (!np) {
+ pr_err("fsl-pamu: could not find a PAMU node\n");
+ return -ENODEV;
+ }
+
+ ret = platform_driver_register(&fsl_of_pamu_driver);
+ if (ret) {
+ pr_err("fsl-pamu: could not register driver (err=%i)\n", ret);
+ goto error_driver_register;
+ }
+
+ pdev = platform_device_alloc("fsl-of-pamu", 0);
+ if (!pdev) {
+ pr_err("fsl-pamu: could not allocate device %s\n",
+ np->full_name);
+ ret = -ENOMEM;
+ goto error_device_alloc;
+ }
+ pdev->dev.of_node = of_node_get(np);
+
+ ret = pamu_domain_init();
+ if (ret)
+ goto error_device_add;
+
+ ret = platform_device_add(pdev);
+ if (ret) {
+ pr_err("fsl-pamu: could not add device %s (err=%i)\n",
+ np->full_name, ret);
+ goto error_device_add;
+ }
+
+ return 0;
+
+error_device_add:
+ of_node_put(pdev->dev.of_node);
+ pdev->dev.of_node = NULL;
+
+ platform_device_put(pdev);
+
+error_device_alloc:
+ platform_driver_unregister(&fsl_of_pamu_driver);
+
+error_driver_register:
+ of_node_put(np);
+
+ return ret;
+}
+arch_initcall(fsl_pamu_init);
diff --git a/drivers/iommu/fsl_pamu.h b/drivers/iommu/fsl_pamu.h
new file mode 100644
index 0000000..8fc1a12
--- /dev/null
+++ b/drivers/iommu/fsl_pamu.h
@@ -0,0 +1,410 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ */
+
+#ifndef __FSL_PAMU_H
+#define __FSL_PAMU_H
+
+#include <asm/fsl_pamu_stash.h>
+
+/* Bit Field macros
+ * v = bit field variable; m = mask, m##_SHIFT = shift, x = value to load
+ */
+#define set_bf(v, m, x) (v = ((v) & ~(m)) | (((x) << (m##_SHIFT)) & (m)))
+#define get_bf(v, m) (((v) & (m)) >> (m##_SHIFT))
+
+/* PAMU CCSR space */
+#define PAMU_PGC 0x00000000 /* Allows all peripheral accesses */
+#define PAMU_PE 0x40000000 /* enable PAMU */
+
+/* PAMU_OFFSET to the next pamu space in ccsr */
+#define PAMU_OFFSET 0x1000
+
+#define PAMU_MMAP_REGS_BASE 0
+
+struct pamu_mmap_regs {
+ u32 ppbah;
+ u32 ppbal;
+ u32 pplah;
+ u32 pplal;
+ u32 spbah;
+ u32 spbal;
+ u32 splah;
+ u32 splal;
+ u32 obah;
+ u32 obal;
+ u32 olah;
+ u32 olal;
+};
+
+/* PAMU Error Registers */
+#define PAMU_POES1 0x0040
+#define PAMU_POES2 0x0044
+#define PAMU_POEAH 0x0048
+#define PAMU_POEAL 0x004C
+#define PAMU_AVS1 0x0050
+#define PAMU_AVS1_AV 0x1
+#define PAMU_AVS1_OTV 0x6
+#define PAMU_AVS1_APV 0x78
+#define PAMU_AVS1_WAV 0x380
+#define PAMU_AVS1_LAV 0x1c00
+#define PAMU_AVS1_GCV 0x2000
+#define PAMU_AVS1_PDV 0x4000
+#define PAMU_AV_MASK (PAMU_AVS1_AV | PAMU_AVS1_OTV | PAMU_AVS1_APV | PAMU_AVS1_WAV \
+ | PAMU_AVS1_LAV | PAMU_AVS1_GCV | PAMU_AVS1_PDV)
+#define PAMU_AVS1_LIODN_SHIFT 16
+#define PAMU_LAV_LIODN_NOT_IN_PPAACT 0x400
+
+#define PAMU_AVS2 0x0054
+#define PAMU_AVAH 0x0058
+#define PAMU_AVAL 0x005C
+#define PAMU_EECTL 0x0060
+#define PAMU_EEDIS 0x0064
+#define PAMU_EEINTEN 0x0068
+#define PAMU_EEDET 0x006C
+#define PAMU_EEATTR 0x0070
+#define PAMU_EEAHI 0x0074
+#define PAMU_EEALO 0x0078
+#define PAMU_EEDHI 0X007C
+#define PAMU_EEDLO 0x0080
+#define PAMU_EECC 0x0084
+#define PAMU_UDAD 0x0090
+
+/* PAMU Revision Registers */
+#define PAMU_PR1 0x0BF8
+#define PAMU_PR2 0x0BFC
+
+/* PAMU version mask */
+#define PAMU_PR1_MASK 0xffff
+
+/* PAMU Capabilities Registers */
+#define PAMU_PC1 0x0C00
+#define PAMU_PC2 0x0C04
+#define PAMU_PC3 0x0C08
+#define PAMU_PC4 0x0C0C
+
+/* PAMU Control Register */
+#define PAMU_PC 0x0C10
+
+/* PAMU control defs */
+#define PAMU_CONTROL 0x0C10
+#define PAMU_PC_PGC 0x80000000 /* PAMU gate closed bit */
+#define PAMU_PC_PE 0x40000000 /* PAMU enable bit */
+#define PAMU_PC_SPCC 0x00000010 /* sPAACE cache enable */
+#define PAMU_PC_PPCC 0x00000001 /* pPAACE cache enable */
+#define PAMU_PC_OCE 0x00001000 /* OMT cache enable */
+
+#define PAMU_PFA1 0x0C14
+#define PAMU_PFA2 0x0C18
+
+#define PAMU_PC2_MLIODN(X) ((X) >> 16)
+#define PAMU_PC3_MWCE(X) (((X) >> 21) & 0xf)
+
+/* PAMU Interrupt control and Status Register */
+#define PAMU_PICS 0x0C1C
+#define PAMU_ACCESS_VIOLATION_STAT 0x8
+#define PAMU_ACCESS_VIOLATION_ENABLE 0x4
+
+/* PAMU Debug Registers */
+#define PAMU_PD1 0x0F00
+#define PAMU_PD2 0x0F04
+#define PAMU_PD3 0x0F08
+#define PAMU_PD4 0x0F0C
+
+#define PAACE_AP_PERMS_DENIED 0x0
+#define PAACE_AP_PERMS_QUERY 0x1
+#define PAACE_AP_PERMS_UPDATE 0x2
+#define PAACE_AP_PERMS_ALL 0x3
+
+#define PAACE_DD_TO_HOST 0x0
+#define PAACE_DD_TO_IO 0x1
+#define PAACE_PT_PRIMARY 0x0
+#define PAACE_PT_SECONDARY 0x1
+#define PAACE_V_INVALID 0x0
+#define PAACE_V_VALID 0x1
+#define PAACE_MW_SUBWINDOWS 0x1
+
+#define PAACE_WSE_4K 0xB
+#define PAACE_WSE_8K 0xC
+#define PAACE_WSE_16K 0xD
+#define PAACE_WSE_32K 0xE
+#define PAACE_WSE_64K 0xF
+#define PAACE_WSE_128K 0x10
+#define PAACE_WSE_256K 0x11
+#define PAACE_WSE_512K 0x12
+#define PAACE_WSE_1M 0x13
+#define PAACE_WSE_2M 0x14
+#define PAACE_WSE_4M 0x15
+#define PAACE_WSE_8M 0x16
+#define PAACE_WSE_16M 0x17
+#define PAACE_WSE_32M 0x18
+#define PAACE_WSE_64M 0x19
+#define PAACE_WSE_128M 0x1A
+#define PAACE_WSE_256M 0x1B
+#define PAACE_WSE_512M 0x1C
+#define PAACE_WSE_1G 0x1D
+#define PAACE_WSE_2G 0x1E
+#define PAACE_WSE_4G 0x1F
+
+#define PAACE_DID_PCI_EXPRESS_1 0x00
+#define PAACE_DID_PCI_EXPRESS_2 0x01
+#define PAACE_DID_PCI_EXPRESS_3 0x02
+#define PAACE_DID_PCI_EXPRESS_4 0x03
+#define PAACE_DID_LOCAL_BUS 0x04
+#define PAACE_DID_SRIO 0x0C
+#define PAACE_DID_MEM_1 0x10
+#define PAACE_DID_MEM_2 0x11
+#define PAACE_DID_MEM_3 0x12
+#define PAACE_DID_MEM_4 0x13
+#define PAACE_DID_MEM_1_2 0x14
+#define PAACE_DID_MEM_3_4 0x15
+#define PAACE_DID_MEM_1_4 0x16
+#define PAACE_DID_BM_SW_PORTAL 0x18
+#define PAACE_DID_PAMU 0x1C
+#define PAACE_DID_CAAM 0x21
+#define PAACE_DID_QM_SW_PORTAL 0x3C
+#define PAACE_DID_CORE0_INST 0x80
+#define PAACE_DID_CORE0_DATA 0x81
+#define PAACE_DID_CORE1_INST 0x82
+#define PAACE_DID_CORE1_DATA 0x83
+#define PAACE_DID_CORE2_INST 0x84
+#define PAACE_DID_CORE2_DATA 0x85
+#define PAACE_DID_CORE3_INST 0x86
+#define PAACE_DID_CORE3_DATA 0x87
+#define PAACE_DID_CORE4_INST 0x88
+#define PAACE_DID_CORE4_DATA 0x89
+#define PAACE_DID_CORE5_INST 0x8A
+#define PAACE_DID_CORE5_DATA 0x8B
+#define PAACE_DID_CORE6_INST 0x8C
+#define PAACE_DID_CORE6_DATA 0x8D
+#define PAACE_DID_CORE7_INST 0x8E
+#define PAACE_DID_CORE7_DATA 0x8F
+#define PAACE_DID_BROADCAST 0xFF
+
+#define PAACE_ATM_NO_XLATE 0x00
+#define PAACE_ATM_WINDOW_XLATE 0x01
+#define PAACE_ATM_PAGE_XLATE 0x02
+#define PAACE_ATM_WIN_PG_XLATE \
+ (PAACE_ATM_WINDOW_XLATE | PAACE_ATM_PAGE_XLATE)
+#define PAACE_OTM_NO_XLATE 0x00
+#define PAACE_OTM_IMMEDIATE 0x01
+#define PAACE_OTM_INDEXED 0x02
+#define PAACE_OTM_RESERVED 0x03
+
+#define PAACE_M_COHERENCE_REQ 0x01
+
+#define PAACE_PID_0 0x0
+#define PAACE_PID_1 0x1
+#define PAACE_PID_2 0x2
+#define PAACE_PID_3 0x3
+#define PAACE_PID_4 0x4
+#define PAACE_PID_5 0x5
+#define PAACE_PID_6 0x6
+#define PAACE_PID_7 0x7
+
+#define PAACE_TCEF_FORMAT0_8B 0x00
+#define PAACE_TCEF_FORMAT1_RSVD 0x01
+/*
+ * Hard coded value for the PAACT size to accomodate
+ * maximum LIODN value generated by u-boot.
+ */
+#define PAACE_NUMBER_ENTRIES 0x500
+/* Hard coded value for the SPAACT size */
+#define SPAACE_NUMBER_ENTRIES 0x800
+
+#define OME_NUMBER_ENTRIES 16
+
+/* PAACE Bit Field Defines */
+#define PPAACE_AF_WBAL 0xfffff000
+#define PPAACE_AF_WBAL_SHIFT 12
+#define PPAACE_AF_WSE 0x00000fc0
+#define PPAACE_AF_WSE_SHIFT 6
+#define PPAACE_AF_MW 0x00000020
+#define PPAACE_AF_MW_SHIFT 5
+
+#define SPAACE_AF_LIODN 0xffff0000
+#define SPAACE_AF_LIODN_SHIFT 16
+
+#define PAACE_AF_AP 0x00000018
+#define PAACE_AF_AP_SHIFT 3
+#define PAACE_AF_DD 0x00000004
+#define PAACE_AF_DD_SHIFT 2
+#define PAACE_AF_PT 0x00000002
+#define PAACE_AF_PT_SHIFT 1
+#define PAACE_AF_V 0x00000001
+#define PAACE_AF_V_SHIFT 0
+
+#define PAACE_DA_HOST_CR 0x80
+#define PAACE_DA_HOST_CR_SHIFT 7
+
+#define PAACE_IA_CID 0x00FF0000
+#define PAACE_IA_CID_SHIFT 16
+#define PAACE_IA_WCE 0x000000F0
+#define PAACE_IA_WCE_SHIFT 4
+#define PAACE_IA_ATM 0x0000000C
+#define PAACE_IA_ATM_SHIFT 2
+#define PAACE_IA_OTM 0x00000003
+#define PAACE_IA_OTM_SHIFT 0
+
+#define PAACE_WIN_TWBAL 0xfffff000
+#define PAACE_WIN_TWBAL_SHIFT 12
+#define PAACE_WIN_SWSE 0x00000fc0
+#define PAACE_WIN_SWSE_SHIFT 6
+
+/* PAMU Data Structures */
+/* primary / secondary paact structure */
+struct paace {
+ /* PAACE Offset 0x00 */
+ u32 wbah; /* only valid for Primary PAACE */
+ u32 addr_bitfields; /* See P/S PAACE_AF_* */
+
+ /* PAACE Offset 0x08 */
+ /* Interpretation of first 32 bits dependent on DD above */
+ union {
+ struct {
+ /* Destination ID, see PAACE_DID_* defines */
+ u8 did;
+ /* Partition ID */
+ u8 pid;
+ /* Snoop ID */
+ u8 snpid;
+ /* coherency_required : 1 reserved : 7 */
+ u8 coherency_required; /* See PAACE_DA_* */
+ } to_host;
+ struct {
+ /* Destination ID, see PAACE_DID_* defines */
+ u8 did;
+ u8 reserved1;
+ u16 reserved2;
+ } to_io;
+ } domain_attr;
+
+ /* Implementation attributes + window count + address & operation translation modes */
+ u32 impl_attr; /* See PAACE_IA_* */
+
+ /* PAACE Offset 0x10 */
+ /* Translated window base address */
+ u32 twbah;
+ u32 win_bitfields; /* See PAACE_WIN_* */
+
+ /* PAACE Offset 0x18 */
+ /* first secondary paace entry */
+ u32 fspi; /* only valid for Primary PAACE */
+ union {
+ struct {
+ u8 ioea;
+ u8 moea;
+ u8 ioeb;
+ u8 moeb;
+ } immed_ot;
+ struct {
+ u16 reserved;
+ u16 omi;
+ } index_ot;
+ } op_encode;
+
+ /* PAACE Offsets 0x20-0x38 */
+ u32 reserved[8]; /* not currently implemented */
+};
+
+/* OME : Operation mapping entry
+ * MOE : Mapped Operation Encodings
+ * The operation mapping table is table containing operation mapping entries (OME).
+ * The index of a particular OME is programmed in the PAACE entry for translation
+ * in bound I/O operations corresponding to an LIODN. The OMT is used for translation
+ * specifically in case of the indexed translation mode. Each OME contains a 128
+ * byte mapped operation encoding (MOE), where each byte represents an MOE.
+ */
+#define NUM_MOE 128
+struct ome {
+ u8 moe[NUM_MOE];
+} __attribute__((packed));
+
+#define PAACT_SIZE (sizeof(struct paace) * PAACE_NUMBER_ENTRIES)
+#define SPAACT_SIZE (sizeof(struct paace) * SPAACE_NUMBER_ENTRIES)
+#define OMT_SIZE (sizeof(struct ome) * OME_NUMBER_ENTRIES)
+
+#define PAMU_PAGE_SHIFT 12
+#define PAMU_PAGE_SIZE 4096ULL
+
+#define IOE_READ 0x00
+#define IOE_READ_IDX 0x00
+#define IOE_WRITE 0x81
+#define IOE_WRITE_IDX 0x01
+#define IOE_EREAD0 0x82 /* Enhanced read type 0 */
+#define IOE_EREAD0_IDX 0x02 /* Enhanced read type 0 */
+#define IOE_EWRITE0 0x83 /* Enhanced write type 0 */
+#define IOE_EWRITE0_IDX 0x03 /* Enhanced write type 0 */
+#define IOE_DIRECT0 0x84 /* Directive type 0 */
+#define IOE_DIRECT0_IDX 0x04 /* Directive type 0 */
+#define IOE_EREAD1 0x85 /* Enhanced read type 1 */
+#define IOE_EREAD1_IDX 0x05 /* Enhanced read type 1 */
+#define IOE_EWRITE1 0x86 /* Enhanced write type 1 */
+#define IOE_EWRITE1_IDX 0x06 /* Enhanced write type 1 */
+#define IOE_DIRECT1 0x87 /* Directive type 1 */
+#define IOE_DIRECT1_IDX 0x07 /* Directive type 1 */
+#define IOE_RAC 0x8c /* Read with Atomic clear */
+#define IOE_RAC_IDX 0x0c /* Read with Atomic clear */
+#define IOE_RAS 0x8d /* Read with Atomic set */
+#define IOE_RAS_IDX 0x0d /* Read with Atomic set */
+#define IOE_RAD 0x8e /* Read with Atomic decrement */
+#define IOE_RAD_IDX 0x0e /* Read with Atomic decrement */
+#define IOE_RAI 0x8f /* Read with Atomic increment */
+#define IOE_RAI_IDX 0x0f /* Read with Atomic increment */
+
+#define EOE_READ 0x00
+#define EOE_WRITE 0x01
+#define EOE_RAC 0x0c /* Read with Atomic clear */
+#define EOE_RAS 0x0d /* Read with Atomic set */
+#define EOE_RAD 0x0e /* Read with Atomic decrement */
+#define EOE_RAI 0x0f /* Read with Atomic increment */
+#define EOE_LDEC 0x10 /* Load external cache */
+#define EOE_LDECL 0x11 /* Load external cache with stash lock */
+#define EOE_LDECPE 0x12 /* Load external cache with preferred exclusive */
+#define EOE_LDECPEL 0x13 /* Load external cache with preferred exclusive and lock */
+#define EOE_LDECFE 0x14 /* Load external cache with forced exclusive */
+#define EOE_LDECFEL 0x15 /* Load external cache with forced exclusive and lock */
+#define EOE_RSA 0x16 /* Read with stash allocate */
+#define EOE_RSAU 0x17 /* Read with stash allocate and unlock */
+#define EOE_READI 0x18 /* Read with invalidate */
+#define EOE_RWNITC 0x19 /* Read with no intention to cache */
+#define EOE_WCI 0x1a /* Write cache inhibited */
+#define EOE_WWSA 0x1b /* Write with stash allocate */
+#define EOE_WWSAL 0x1c /* Write with stash allocate and lock */
+#define EOE_WWSAO 0x1d /* Write with stash allocate only */
+#define EOE_WWSAOL 0x1e /* Write with stash allocate only and lock */
+#define EOE_VALID 0x80
+
+/* Function prototypes */
+int pamu_domain_init(void);
+int pamu_enable_liodn(int liodn);
+int pamu_disable_liodn(int liodn);
+void pamu_free_subwins(int liodn);
+int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
+ u32 omi, unsigned long rpn, u32 snoopid, uint32_t stashid,
+ u32 subwin_cnt, int prot);
+int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
+ phys_addr_t subwin_size, u32 omi, unsigned long rpn,
+ uint32_t snoopid, u32 stashid, int enable, int prot);
+
+u32 get_stash_id(u32 stash_dest_hint, u32 vcpu);
+void get_ome_index(u32 *omi_index, struct device *dev);
+int pamu_update_paace_stash(int liodn, u32 subwin, u32 value);
+int pamu_disable_spaace(int liodn, u32 subwin);
+u32 pamu_get_max_subwin_cnt(void);
+
+#endif /* __FSL_PAMU_H */
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
new file mode 100644
index 0000000..5496c4c
--- /dev/null
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -0,0 +1,1142 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ * Author: Varun Sethi <[email protected]>
+ *
+ */
+
+#define pr_fmt(fmt) "fsl-pamu-domain: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/iommu.h>
+#include <linux/notifier.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/of_platform.h>
+#include <linux/bootmem.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include <asm/pci-bridge.h>
+#include <sysdev/fsl_pci.h>
+
+#include "fsl_pamu_domain.h"
+#include "pci.h"
+
+/*
+ * Global spinlock that needs to be held while
+ * configuring PAMU.
+ */
+static DEFINE_SPINLOCK(iommu_lock);
+
+static struct kmem_cache *fsl_pamu_domain_cache;
+static struct kmem_cache *iommu_devinfo_cache;
+static DEFINE_SPINLOCK(device_domain_lock);
+
+static int __init iommu_init_mempool(void)
+{
+
+ fsl_pamu_domain_cache = kmem_cache_create("fsl_pamu_domain",
+ sizeof(struct fsl_dma_domain),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+
+ NULL);
+ if (!fsl_pamu_domain_cache) {
+ pr_err("Couldn't create fsl iommu_domain cache\n");
+ return -ENOMEM;
+ }
+
+ iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
+ sizeof(struct device_domain_info),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!iommu_devinfo_cache) {
+ pr_err("Couldn't create devinfo cache\n");
+ kmem_cache_destroy(fsl_pamu_domain_cache);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, dma_addr_t iova)
+{
+ u32 win_cnt = dma_domain->win_cnt;
+ struct dma_window *win_ptr =
+ &dma_domain->win_arr[0];
+ struct iommu_domain_geometry *geom;
+
+ geom = &dma_domain->iommu_domain->geometry;
+
+ if (!win_cnt || !dma_domain->geom_size) {
+ pr_err("Number of windows/geometry not configured for the domain\n");
+ return 0;
+ }
+
+ if (win_cnt > 1) {
+ u64 subwin_size;
+ dma_addr_t subwin_iova;
+ u32 wnd;
+
+ subwin_size = dma_domain->geom_size >> ilog2(win_cnt);
+ subwin_iova = iova & ~(subwin_size - 1);
+ wnd = (subwin_iova - geom->aperture_start) >> ilog2(subwin_size);
+ win_ptr = &dma_domain->win_arr[wnd];
+ }
+
+ if (win_ptr->valid)
+ return (win_ptr->paddr + (iova & (win_ptr->size - 1)));
+
+ return 0;
+}
+
+static int map_subwins(int liodn, struct fsl_dma_domain *dma_domain)
+{
+ struct dma_window *sub_win_ptr =
+ &dma_domain->win_arr[0];
+ int i, ret;
+ unsigned long rpn, flags;
+
+ for (i = 0; i < dma_domain->win_cnt; i++) {
+ if (sub_win_ptr[i].valid) {
+ rpn = sub_win_ptr[i].paddr >>
+ PAMU_PAGE_SHIFT;
+ spin_lock_irqsave(&iommu_lock, flags);
+ ret = pamu_config_spaace(liodn, dma_domain->win_cnt, i,
+ sub_win_ptr[i].size,
+ ~(u32)0,
+ rpn,
+ dma_domain->snoop_id,
+ dma_domain->stash_id,
+ (i > 0) ? 1 : 0,
+ sub_win_ptr[i].prot);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ if (ret) {
+ pr_err("PAMU SPAACE configuration failed for liodn %d\n",
+ liodn);
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static int map_win(int liodn, struct fsl_dma_domain *dma_domain)
+{
+ int ret;
+ struct dma_window *wnd = &dma_domain->win_arr[0];
+ phys_addr_t wnd_addr = dma_domain->iommu_domain->geometry.aperture_start;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu_lock, flags);
+ ret = pamu_config_ppaace(liodn, wnd_addr,
+ wnd->size,
+ ~(u32)0,
+ wnd->paddr >> PAMU_PAGE_SHIFT,
+ dma_domain->snoop_id, dma_domain->stash_id,
+ 0, wnd->prot);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ if (ret)
+ pr_err("PAMU PAACE configuration failed for liodn %d\n",
+ liodn);
+
+ return ret;
+}
+
+/* Map the DMA window corresponding to the LIODN */
+static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain)
+{
+ if (dma_domain->win_cnt > 1)
+ return map_subwins(liodn, dma_domain);
+ else
+ return map_win(liodn, dma_domain);
+
+}
+
+/* Update window/subwindow mapping for the LIODN */
+static int update_liodn(int liodn, struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+ int ret;
+ struct dma_window *wnd = &dma_domain->win_arr[wnd_nr];
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu_lock, flags);
+ if (dma_domain->win_cnt > 1) {
+ ret = pamu_config_spaace(liodn, dma_domain->win_cnt, wnd_nr,
+ wnd->size,
+ ~(u32)0,
+ wnd->paddr >> PAMU_PAGE_SHIFT,
+ dma_domain->snoop_id,
+ dma_domain->stash_id,
+ (wnd_nr > 0) ? 1 : 0,
+ wnd->prot);
+ if (ret)
+ pr_err("Subwindow reconfiguration failed for liodn %d\n", liodn);
+ } else {
+ phys_addr_t wnd_addr;
+
+ wnd_addr = dma_domain->iommu_domain->geometry.aperture_start;
+
+ ret = pamu_config_ppaace(liodn, wnd_addr,
+ wnd->size,
+ ~(u32)0,
+ wnd->paddr >> PAMU_PAGE_SHIFT,
+ dma_domain->snoop_id, dma_domain->stash_id,
+ 0, wnd->prot);
+ if (ret)
+ pr_err("Window reconfiguration failed for liodn %d\n", liodn);
+ }
+
+ spin_unlock_irqrestore(&iommu_lock, flags);
+
+ return ret;
+}
+
+static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
+ u32 val)
+{
+ int ret = 0, i;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu_lock, flags);
+ if (!dma_domain->win_arr) {
+ pr_err("Windows not configured, stash destination update failed for liodn %d\n", liodn);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < dma_domain->win_cnt; i++) {
+ ret = pamu_update_paace_stash(liodn, i, val);
+ if (ret) {
+ pr_err("Failed to update SPAACE %d field for liodn %d\n ", i, liodn);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ return ret;
+ }
+ }
+
+ spin_unlock_irqrestore(&iommu_lock, flags);
+
+ return ret;
+}
+
+/* Set the geometry parameters for a LIODN */
+static int pamu_set_liodn(int liodn, struct device *dev,
+ struct fsl_dma_domain *dma_domain,
+ struct iommu_domain_geometry *geom_attr,
+ u32 win_cnt)
+{
+ phys_addr_t window_addr, window_size;
+ phys_addr_t subwin_size;
+ int ret = 0, i;
+ u32 omi_index = ~(u32)0;
+ unsigned long flags;
+
+ /*
+ * Configure the omi_index at the geometry setup time.
+ * This is a static value which depends on the type of
+ * device and would not change thereafter.
+ */
+ get_ome_index(&omi_index, dev);
+
+ window_addr = geom_attr->aperture_start;
+ window_size = dma_domain->geom_size;
+
+ spin_lock_irqsave(&iommu_lock, flags);
+ ret = pamu_disable_liodn(liodn);
+ if (!ret)
+ ret = pamu_config_ppaace(liodn, window_addr, window_size, omi_index,
+ 0, dma_domain->snoop_id,
+ dma_domain->stash_id, win_cnt, 0);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ if (ret) {
+ pr_err("PAMU PAACE configuration failed for liodn %d, win_cnt =%d\n", liodn, win_cnt);
+ return ret;
+ }
+
+ if (win_cnt > 1) {
+ subwin_size = window_size >> ilog2(win_cnt);
+ for (i = 0; i < win_cnt; i++) {
+ spin_lock_irqsave(&iommu_lock, flags);
+ ret = pamu_disable_spaace(liodn, i);
+ if (!ret)
+ ret = pamu_config_spaace(liodn, win_cnt, i,
+ subwin_size, omi_index,
+ 0, dma_domain->snoop_id,
+ dma_domain->stash_id,
+ 0, 0);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ if (ret) {
+ pr_err("PAMU SPAACE configuration failed for liodn %d\n", liodn);
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static int check_size(u64 size, dma_addr_t iova)
+{
+ /*
+ * Size must be a power of two and at least be equal
+ * to PAMU page size.
+ */
+ if (!is_power_of_2(size) || size < PAMU_PAGE_SIZE) {
+ pr_err("%s: size too small or not a power of two\n", __func__);
+ return -EINVAL;
+ }
+
+ /* iova must be page size aligned*/
+ if (iova & (size - 1)) {
+ pr_err("%s: address is not aligned with window size\n", __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
+{
+ struct fsl_dma_domain *domain;
+
+ domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
+ if (!domain)
+ return NULL;
+
+ domain->stash_id = ~(u32)0;
+ domain->snoop_id = ~(u32)0;
+ domain->win_cnt = pamu_get_max_subwin_cnt();
+ domain->geom_size = 0;
+
+ INIT_LIST_HEAD(&domain->devices);
+
+ spin_lock_init(&domain->domain_lock);
+
+ return domain;
+}
+
+static inline struct device_domain_info *find_domain(struct device *dev)
+{
+ return dev->archdata.iommu_domain;
+}
+
+static void remove_device_ref(struct device_domain_info *info, u32 win_cnt)
+{
+ unsigned long flags;
+
+ list_del(&info->link);
+ spin_lock_irqsave(&iommu_lock, flags);
+ if (win_cnt > 1)
+ pamu_free_subwins(info->liodn);
+ pamu_disable_liodn(info->liodn);
+ spin_unlock_irqrestore(&iommu_lock, flags);
+ spin_lock_irqsave(&device_domain_lock, flags);
+ info->dev->archdata.iommu_domain = NULL;
+ kmem_cache_free(iommu_devinfo_cache, info);
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+}
+
+static void detach_device(struct device *dev, struct fsl_dma_domain *dma_domain)
+{
+ struct device_domain_info *info, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ /* Remove the device from the domain device list */
+ list_for_each_entry_safe(info, tmp, &dma_domain->devices, link) {
+ if (!dev || (info->dev == dev))
+ remove_device_ref(info, dma_domain->win_cnt);
+ }
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+}
+
+static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct device *dev)
+{
+ struct device_domain_info *info, *old_domain_info;
+ unsigned long flags;
+
+ spin_lock_irqsave(&device_domain_lock, flags);
+ /*
+ * Check here if the device is already attached to domain or not.
+ * If the device is already attached to a domain detach it.
+ */
+ old_domain_info = find_domain(dev);
+ if (old_domain_info && old_domain_info->domain != dma_domain) {
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+ detach_device(dev, old_domain_info->domain);
+ spin_lock_irqsave(&device_domain_lock, flags);
+ }
+
+ info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_ATOMIC);
+
+ info->dev = dev;
+ info->liodn = liodn;
+ info->domain = dma_domain;
+
+ list_add(&info->link, &dma_domain->devices);
+ /*
+ * In case of devices with multiple LIODNs just store
+ * the info for the first LIODN as all
+ * LIODNs share the same domain
+ */
+ if (!old_domain_info)
+ dev->archdata.iommu_domain = info;
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+
+}
+
+static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain,
+ dma_addr_t iova)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+
+ if ((iova < domain->geometry.aperture_start) ||
+ iova > (domain->geometry.aperture_end))
+ return 0;
+
+ return get_phys_addr(dma_domain, iova);
+}
+
+static int fsl_pamu_domain_has_cap(struct iommu_domain *domain,
+ unsigned long cap)
+{
+ return cap == IOMMU_CAP_CACHE_COHERENCY;
+}
+
+static void fsl_pamu_domain_destroy(struct iommu_domain *domain)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+
+ domain->priv = NULL;
+
+ /* remove all the devices from the device list */
+ detach_device(NULL, dma_domain);
+
+ dma_domain->enabled = 0;
+ dma_domain->mapped = 0;
+
+ kmem_cache_free(fsl_pamu_domain_cache, dma_domain);
+}
+
+static int fsl_pamu_domain_init(struct iommu_domain *domain)
+{
+ struct fsl_dma_domain *dma_domain;
+
+ dma_domain = iommu_alloc_dma_domain();
+ if (!dma_domain) {
+ pr_err("dma_domain allocation failed\n");
+ return -ENOMEM;
+ }
+ domain->priv = dma_domain;
+ dma_domain->iommu_domain = domain;
+ /* defaul geometry 64 GB i.e. maximum system address */
+ domain->geometry.aperture_start = 0;
+ domain->geometry.aperture_end = (1ULL << 36) - 1;
+ domain->geometry.force_aperture = true;
+
+ return 0;
+}
+
+/* Configure geometry settings for all LIODNs associated with domain */
+static int pamu_set_domain_geometry(struct fsl_dma_domain *dma_domain,
+ struct iommu_domain_geometry *geom_attr,
+ u32 win_cnt)
+{
+ struct device_domain_info *info;
+ int ret = 0;
+
+ list_for_each_entry(info, &dma_domain->devices, link) {
+ ret = pamu_set_liodn(info->liodn, info->dev, dma_domain,
+ geom_attr, win_cnt);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/* Update stash destination for all LIODNs associated with the domain */
+static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
+{
+ struct device_domain_info *info;
+ int ret = 0;
+
+ list_for_each_entry(info, &dma_domain->devices, link) {
+ ret = update_liodn_stash(info->liodn, dma_domain, val);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/* Update domain mappings for all LIODNs associated with the domain */
+static int update_domain_mapping(struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+ struct device_domain_info *info;
+ int ret = 0;
+
+ list_for_each_entry(info, &dma_domain->devices, link) {
+ ret = update_liodn(info->liodn, dma_domain, wnd_nr);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static int disable_domain_win(struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+ struct device_domain_info *info;
+ int ret = 0;
+
+ list_for_each_entry(info, &dma_domain->devices, link) {
+ if (dma_domain->win_cnt == 1 && dma_domain->enabled) {
+ ret = pamu_disable_liodn(info->liodn);
+ if (!ret)
+ dma_domain->enabled = 0;
+ } else {
+ ret = pamu_disable_spaace(info->liodn, wnd_nr);
+ }
+ }
+
+ return ret;
+}
+
+static void fsl_pamu_window_disable(struct iommu_domain *domain, u32 wnd_nr)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ if (!dma_domain->win_arr) {
+ pr_err("Number of windows not configured\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return;
+ }
+
+ if (wnd_nr >= dma_domain->win_cnt) {
+ pr_err("Invalid window index\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return;
+ }
+
+ if (dma_domain->win_arr[wnd_nr].valid) {
+ ret = disable_domain_win(dma_domain, wnd_nr);
+ if (!ret) {
+ dma_domain->win_arr[wnd_nr].valid = 0;
+ dma_domain->mapped--;
+ }
+ }
+
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+}
+
+static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr,
+ phys_addr_t paddr, u64 size, int prot)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ struct dma_window *wnd;
+ int pamu_prot = 0;
+ int ret;
+ unsigned long flags;
+ u64 win_size;
+
+ if (prot & IOMMU_READ)
+ pamu_prot |= PAACE_AP_PERMS_QUERY;
+ if (prot & IOMMU_WRITE)
+ pamu_prot |= PAACE_AP_PERMS_UPDATE;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ if (!dma_domain->win_arr) {
+ pr_err("Number of windows not configured\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -ENODEV;
+ }
+
+ if (wnd_nr >= dma_domain->win_cnt) {
+ pr_err("Invalid window index\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+
+ win_size = dma_domain->geom_size >> ilog2(dma_domain->win_cnt);
+ if (size > win_size) {
+ pr_err("Invalid window size \n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+
+ if (dma_domain->win_cnt == 1) {
+ if (dma_domain->enabled) {
+ pr_err("Disable the window before updating the mapping\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EBUSY;
+ }
+
+ ret = check_size(size, domain->geometry.aperture_start);
+ if (ret) {
+ pr_err("Aperture start not aligned to the size\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+ }
+
+ wnd = &dma_domain->win_arr[wnd_nr];
+ if (!wnd->valid) {
+ wnd->paddr = paddr;
+ wnd->size = size;
+ wnd->prot = pamu_prot;
+
+ ret = update_domain_mapping(dma_domain, wnd_nr);
+ if (!ret) {
+ wnd->valid = 1;
+ dma_domain->mapped++;
+ }
+ } else {
+ pr_err("Disable the window before updating the mapping\n");
+ ret = -EBUSY;
+ }
+
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return ret;
+}
+
+/*
+ * Attach the LIODN to the DMA domain and configure the geometry
+ * and window mappings.
+ */
+static int handle_attach_device(struct fsl_dma_domain *dma_domain,
+ struct device *dev, const u32 *liodn,
+ int num)
+{
+ unsigned long flags;
+ struct iommu_domain *domain = dma_domain->iommu_domain;
+ int ret = 0;
+ int i;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ for (i = 0; i < num; i++) {
+
+ /* Ensure that LIODN value is valid */
+ if (liodn[i] >= PAACE_NUMBER_ENTRIES) {
+ pr_err("Invalid liodn %d, attach device failed for %s\n",
+ liodn[i], dev->of_node->full_name);
+ ret = -EINVAL;
+ break;
+ }
+
+ attach_device(dma_domain, liodn[i], dev);
+ /*
+ * Check if geometry has already been configured
+ * for the domain. If yes, set the geometry for
+ * the LIODN.
+ */
+ if (dma_domain->win_arr) {
+ u32 win_cnt = dma_domain->win_cnt > 1 ? dma_domain->win_cnt : 0;
+ ret = pamu_set_liodn(liodn[i], dev, dma_domain,
+ &domain->geometry,
+ win_cnt);
+ if (ret)
+ break;
+ if (dma_domain->mapped) {
+ /*
+ * Create window/subwindow mapping for
+ * the LIODN.
+ */
+ ret = map_liodn(liodn[i], dma_domain);
+ if (ret)
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return ret;
+}
+
+static int fsl_pamu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ const u32 *liodn;
+ u32 liodn_cnt;
+ int len, ret = 0;
+ struct pci_dev *pdev = NULL;
+ struct pci_controller *pci_ctl;
+
+ /*
+ * Use LIODN of the PCI controller while attaching a
+ * PCI device.
+ */
+ if (dev->bus == &pci_bus_type) {
+ pdev = to_pci_dev(dev);
+ pci_ctl = pci_bus_to_host(pdev->bus);
+ /*
+ * make dev point to pci controller device
+ * so we can get the LIODN programmed by
+ * u-boot.
+ */
+ dev = pci_ctl->parent;
+ }
+
+ liodn = of_get_property(dev->of_node, "fsl,liodn", &len);
+ if (liodn) {
+ liodn_cnt = len / sizeof(u32);
+ ret = handle_attach_device(dma_domain, dev,
+ liodn, liodn_cnt);
+ } else {
+ pr_err("missing fsl,liodn property at %s\n",
+ dev->of_node->full_name);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void fsl_pamu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ const u32 *prop;
+ int len;
+ struct pci_dev *pdev = NULL;
+ struct pci_controller *pci_ctl;
+
+ /*
+ * Use LIODN of the PCI controller while detaching a
+ * PCI device.
+ */
+ if (dev->bus == &pci_bus_type) {
+ pdev = to_pci_dev(dev);
+ pci_ctl = pci_bus_to_host(pdev->bus);
+ /*
+ * make dev point to pci controller device
+ * so we can get the LIODN programmed by
+ * u-boot.
+ */
+ dev = pci_ctl->parent;
+ }
+
+ prop = of_get_property(dev->of_node, "fsl,liodn", &len);
+ if (prop)
+ detach_device(dev, dma_domain);
+ else
+ pr_err("missing fsl,liodn property at %s\n",
+ dev->of_node->full_name);
+}
+
+static int configure_domain_geometry(struct iommu_domain *domain, void *data)
+{
+ struct iommu_domain_geometry *geom_attr = data;
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ dma_addr_t geom_size;
+ unsigned long flags;
+
+ geom_size = geom_attr->aperture_end - geom_attr->aperture_start + 1;
+ /*
+ * Sanity check the geometry size. Also, we do not support
+ * DMA outside of the geometry.
+ */
+ if (check_size(geom_size, geom_attr->aperture_start) ||
+ !geom_attr->force_aperture) {
+ pr_err("Invalid PAMU geometry attributes\n");
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ if (dma_domain->enabled) {
+ pr_err("Can't set geometry attributes as domain is active\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EBUSY;
+ }
+
+ /* Copy the domain geometry information */
+ memcpy(&domain->geometry, geom_attr,
+ sizeof(struct iommu_domain_geometry));
+ dma_domain->geom_size = geom_size;
+
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return 0;
+}
+
+/* Set the domain stash attribute */
+static int configure_domain_stash(struct fsl_dma_domain *dma_domain, void *data)
+{
+ struct pamu_stash_attribute *stash_attr = data;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+
+ memcpy(&dma_domain->dma_stash, stash_attr,
+ sizeof(struct pamu_stash_attribute));
+
+ dma_domain->stash_id = get_stash_id(stash_attr->cache,
+ stash_attr->cpu);
+ if (dma_domain->stash_id == ~(u32)0) {
+ pr_err("Invalid stash attributes\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+
+ ret = update_domain_stash(dma_domain, dma_domain->stash_id);
+
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return ret;
+}
+
+/* Configure domain dma state i.e. enable/disable DMA*/
+static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool enable)
+{
+ struct device_domain_info *info;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+
+ if (enable && !dma_domain->mapped) {
+ pr_err("Can't enable DMA domain without valid mapping\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -ENODEV;
+ }
+
+ dma_domain->enabled = enable;
+ list_for_each_entry(info, &dma_domain->devices,
+ link) {
+ ret = (enable) ? pamu_enable_liodn(info->liodn) :
+ pamu_disable_liodn(info->liodn);
+ if (ret)
+ pr_err("Unable to set dma state for liodn %d",
+ info->liodn);
+ }
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return 0;
+}
+
+static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
+ enum iommu_attr attr_type, void *data)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ int ret = 0;
+
+
+ switch (attr_type) {
+ case DOMAIN_ATTR_GEOMETRY:
+ ret = configure_domain_geometry(domain, data);
+ break;
+ case DOMAIN_ATTR_FSL_PAMU_STASH:
+ ret = configure_domain_stash(dma_domain, data);
+ break;
+ case DOMAIN_ATTR_FSL_PAMU_ENABLE:
+ ret = configure_domain_dma_state(dma_domain, *(int *)data);
+ break;
+ default:
+ pr_err("Unsupported attribute type\n");
+ ret = -EINVAL;
+ break;
+ };
+
+ return ret;
+}
+
+static int fsl_pamu_get_domain_attr(struct iommu_domain *domain,
+ enum iommu_attr attr_type, void *data)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ int ret = 0;
+
+
+ switch (attr_type) {
+ case DOMAIN_ATTR_FSL_PAMU_STASH:
+ memcpy((struct pamu_stash_attribute *) data, &dma_domain->dma_stash,
+ sizeof(struct pamu_stash_attribute));
+ break;
+ case DOMAIN_ATTR_FSL_PAMU_ENABLE:
+ *(int *)data = dma_domain->enabled;
+ break;
+ case DOMAIN_ATTR_FSL_PAMUV1:
+ *(int *)data = DOMAIN_ATTR_FSL_PAMUV1;
+ break;
+ default:
+ pr_err("Unsupported attribute type\n");
+ ret = -EINVAL;
+ break;
+ };
+
+ return ret;
+}
+
+#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
+
+static struct iommu_group *get_device_iommu_group(struct device *dev)
+{
+ struct iommu_group *group;
+
+ group = iommu_group_get(dev);
+ if (!group)
+ group = iommu_group_alloc();
+
+ return group;
+}
+
+static bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
+{
+ u32 version;
+
+ /* Check the PCI controller version number by readding BRR1 register */
+ version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
+ version &= PCI_FSL_BRR1_VER;
+ /* If PCI controller version is >= 0x204 we can partition endpoints*/
+ if (version >= 0x204)
+ return 1;
+
+ return 0;
+}
+
+static struct iommu_group *get_peer_pci_device_group(struct pci_dev *pdev)
+{
+ struct iommu_group *group = NULL;
+
+ /* check if this is the first device on the bus*/
+ if (pdev->bus_list.next == pdev->bus_list.prev) {
+ struct pci_bus *bus = pdev->bus->parent;
+ /* Traverese the parent bus list to get
+ * pdev & dev for the sibling device.
+ */
+ while (bus) {
+ if (!list_empty(&bus->devices)) {
+ pdev = container_of(bus->devices.next,
+ struct pci_dev, bus_list);
+ group = iommu_group_get(&pdev->dev);
+ break;
+ } else
+ bus = bus->parent;
+ }
+ } else {
+ /*
+ * Get the pdev & dev for the sibling device
+ */
+ pdev = container_of(pdev->bus_list.prev,
+ struct pci_dev, bus_list);
+ group = iommu_group_get(&pdev->dev);
+ }
+
+ return group;
+}
+
+static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
+{
+ struct iommu_group *group = NULL;
+ struct pci_dev *bridge, *dma_pdev = NULL;
+ struct pci_controller *pci_ctl;
+ bool pci_endpt_partioning;
+
+ pci_ctl = pci_bus_to_host(pdev->bus);
+ pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl);
+ /* We can partition PCIe devices so assign device group to the device */
+ if (pci_endpt_partioning) {
+ bridge = pci_find_upstream_pcie_bridge(pdev);
+ if (bridge) {
+ if (pci_is_pcie(bridge))
+ dma_pdev = pci_get_domain_bus_and_slot(
+ pci_domain_nr(pdev->bus),
+ bridge->subordinate->number, 0);
+ if (!dma_pdev)
+ dma_pdev = pci_dev_get(bridge);
+ } else
+ dma_pdev = pci_dev_get(pdev);
+
+ /* Account for quirked devices */
+ swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
+
+ /*
+ * If it's a multifunction device that does not support our
+ * required ACS flags, add to the same group as function 0.
+ */
+ if (dma_pdev->multifunction &&
+ !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS))
+ swap_pci_ref(&dma_pdev,
+ pci_get_slot(dma_pdev->bus,
+ PCI_DEVFN(PCI_SLOT(dma_pdev->devfn),
+ 0)));
+
+ group = get_device_iommu_group(&pdev->dev);
+ pci_dev_put(pdev);
+ /*
+ * PCIe controller is not a paritionable entity
+ * free the controller device iommu_group.
+ */
+ if (pci_ctl->parent->iommu_group)
+ iommu_group_remove_device(pci_ctl->parent);
+ } else {
+ /*
+ * All devices connected to the controller will share the
+ * PCI controllers device group. If this is the first
+ * device to be probed for the pci controller, copy the
+ * device group information from the PCI controller device
+ * node and remove the PCI controller iommu group.
+ * For subsequent devices, the iommu group information can
+ * be obtained from sibling devices (i.e. from the bus_devices
+ * link list).
+ */
+ if (pci_ctl->parent->iommu_group) {
+ group = get_device_iommu_group(pci_ctl->parent);
+ iommu_group_remove_device(pci_ctl->parent);
+ } else
+ group = get_peer_pci_device_group(pdev);
+ }
+
+ return group;
+}
+
+static int fsl_pamu_add_device(struct device *dev)
+{
+ struct iommu_group *group = NULL;
+ struct pci_dev *pdev;
+ const u32 *prop;
+ int ret, len;
+
+ /*
+ * For platform devices we allocate a separate group for
+ * each of the devices.
+ */
+ if (dev->bus == &pci_bus_type) {
+ pdev = to_pci_dev(dev);
+ /* Don't create device groups for virtual PCI bridges */
+ if (pdev->subordinate)
+ return 0;
+
+ group = get_pci_device_group(pdev);
+
+ } else {
+ prop = of_get_property(dev->of_node, "fsl,liodn", &len);
+ if (prop)
+ group = get_device_iommu_group(dev);
+ }
+
+ if (!group || IS_ERR(group))
+ return PTR_ERR(group);
+
+ ret = iommu_group_add_device(group, dev);
+
+ iommu_group_put(group);
+ return ret;
+}
+
+static void fsl_pamu_remove_device(struct device *dev)
+{
+ iommu_group_remove_device(dev);
+}
+
+static int fsl_pamu_set_windows(struct iommu_domain *domain, u32 w_count)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dma_domain->domain_lock, flags);
+ /* Ensure domain is inactive i.e. DMA should be disabled for the domain */
+ if (dma_domain->enabled) {
+ pr_err("Can't set geometry attributes as domain is active\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EBUSY;
+ }
+
+ /* Ensure that the geometry has been set for the domain */
+ if (!dma_domain->geom_size) {
+ pr_err("Please configure geometry before setting the number of windows\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+
+ /*
+ * Ensure we have valid window count i.e. it should be less than
+ * maximum permissible limit and should be a power of two.
+ */
+ if (w_count > pamu_get_max_subwin_cnt() || !is_power_of_2(w_count)) {
+ pr_err("Invalid window count\n");
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -EINVAL;
+ }
+
+ ret = pamu_set_domain_geometry(dma_domain, &domain->geometry,
+ ((w_count > 1) ? w_count : 0));
+ if (!ret) {
+ if (dma_domain->win_arr)
+ kfree(dma_domain->win_arr);
+ dma_domain->win_arr = kzalloc(sizeof(struct dma_window) *
+ w_count, GFP_ATOMIC);
+ if (!dma_domain->win_arr) {
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+ return -ENOMEM;
+ }
+ dma_domain->win_cnt = w_count;
+ }
+ spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+ return ret;
+}
+
+static u32 fsl_pamu_get_windows(struct iommu_domain *domain)
+{
+ struct fsl_dma_domain *dma_domain = domain->priv;
+
+ return dma_domain->win_cnt;
+}
+
+static struct iommu_ops fsl_pamu_ops = {
+ .domain_init = fsl_pamu_domain_init,
+ .domain_destroy = fsl_pamu_domain_destroy,
+ .attach_dev = fsl_pamu_attach_device,
+ .detach_dev = fsl_pamu_detach_device,
+ .domain_window_enable = fsl_pamu_window_enable,
+ .domain_window_disable = fsl_pamu_window_disable,
+ .domain_get_windows = fsl_pamu_get_windows,
+ .domain_set_windows = fsl_pamu_set_windows,
+ .iova_to_phys = fsl_pamu_iova_to_phys,
+ .domain_has_cap = fsl_pamu_domain_has_cap,
+ .domain_set_attr = fsl_pamu_set_domain_attr,
+ .domain_get_attr = fsl_pamu_get_domain_attr,
+ .add_device = fsl_pamu_add_device,
+ .remove_device = fsl_pamu_remove_device,
+};
+
+int pamu_domain_init()
+{
+ int ret = 0;
+
+ ret = iommu_init_mempool();
+ if (ret)
+ return ret;
+
+ bus_set_iommu(&platform_bus_type, &fsl_pamu_ops);
+ bus_set_iommu(&pci_bus_type, &fsl_pamu_ops);
+
+ return ret;
+}
diff --git a/drivers/iommu/fsl_pamu_domain.h b/drivers/iommu/fsl_pamu_domain.h
new file mode 100644
index 0000000..c90293f
--- /dev/null
+++ b/drivers/iommu/fsl_pamu_domain.h
@@ -0,0 +1,85 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ */
+
+#ifndef __FSL_PAMU_DOMAIN_H
+#define __FSL_PAMU_DOMAIN_H
+
+#include "fsl_pamu.h"
+
+struct dma_window {
+ phys_addr_t paddr;
+ u64 size;
+ int valid;
+ int prot;
+};
+
+struct fsl_dma_domain {
+ /*
+ * Indicates the geometry size for the domain.
+ * This would be set when the geometry is
+ * configured for the domain.
+ */
+ dma_addr_t geom_size;
+ /*
+ * Number of windows assocaited with this domain.
+ * During domain initialization, it is set to the
+ * the maximum number of subwindows allowed for a LIODN.
+ * Minimum value for this is 1 indicating a single PAMU
+ * window, without any sub windows. Value can be set/
+ * queried by set_attr/get_attr API for DOMAIN_ATTR_WINDOWS.
+ * Value can only be set once the geometry has been configured.
+ */
+ u32 win_cnt;
+ /*
+ * win_arr contains information of the configured
+ * windows for a domain. This is allocated only
+ * when the number of windows for the domain are
+ * set.
+ */
+ struct dma_window *win_arr;
+ /* list of devices associated with the domain */
+ struct list_head devices;
+ /* dma_domain states:
+ * mapped - A particular mapping has been created
+ * within the configured geometry.
+ * enabled - DMA has been enabled for the given
+ * domain. This translates to setting of the
+ * valid bit for the primary PAACE in the PAMU
+ * PAACT table. Domain geometry should be set and
+ * it must have a valid mapping before DMA can be
+ * enabled for it.
+ *
+ */
+ int mapped;
+ int enabled;
+ /* stash_id obtained from the stash attribute details */
+ u32 stash_id;
+ struct pamu_stash_attribute dma_stash;
+ u32 snoop_id;
+ struct iommu_domain *iommu_domain;
+ spinlock_t domain_lock;
+};
+
+/* domain-device relationship */
+struct device_domain_info {
+ struct list_head link; /* link to domain siblings */
+ struct device *dev;
+ u32 liodn;
+ struct fsl_dma_domain *domain; /* pointer to domain */
+};
+#endif /* __FSL_PAMU_DOMAIN_H */
--
1.7.4.1
Add an iommu domain pointer to device (powerpc) archdata. Devices
are attached to iommu domains and this pointer provides a mechanism
to correlate between a device and the associated iommu domain. This
field is set when a device is attached to a domain.
Signed-off-by: Varun Sethi <[email protected]>
Acked-by: Kumar Gala <[email protected]>
---
- no change in v11.
- no change in v10.
- Added CONFIG_IOMMU_API in v9.
arch/powerpc/include/asm/device.h | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
index 77e97dd..38faede 100644
--- a/arch/powerpc/include/asm/device.h
+++ b/arch/powerpc/include/asm/device.h
@@ -28,6 +28,9 @@ struct dev_archdata {
void *iommu_table_base;
} dma_data;
+#ifdef CONFIG_IOMMU_API
+ void *iommu_domain;
+#endif
#ifdef CONFIG_SWIOTLB
dma_addr_t max_direct_dma_addr;
#endif
--
1.7.4.1
On Thu, Jun 20, 2013 at 09:31:28PM +0530, Varun Sethi wrote:
> This patch provides the PAMU driver (fsl_pamu.c) and the corresponding IOMMU
> API implementation (fsl_pamu_domain.c). The PAMU hardware driver (fsl_pamu.c)
> has been derived from the work done by Ashish Kalra and Timur Tabi.
AlexW,
can you please have a look at the group-code again and ack the patch if
it looks right to you?
Thanks,
Joerg
On Thu, 2013-06-20 at 21:31 +0530, Varun Sethi wrote:
> +#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
> +
> +static struct iommu_group *get_device_iommu_group(struct device *dev)
> +{
> + struct iommu_group *group;
> +
> + group = iommu_group_get(dev);
> + if (!group)
> + group = iommu_group_alloc();
> +
> + return group;
> +}
> +
[snip]
> +
This really gets parent or peer, right?
> +static struct iommu_group *get_peer_pci_device_group(struct pci_dev *pdev)
> +{
> + struct iommu_group *group = NULL;
> +
> + /* check if this is the first device on the bus*/
> + if (pdev->bus_list.next == pdev->bus_list.prev) {
It's a list_head, use list functions. The list implementation should be
treated as opaque.
if (list_is_singular(&pdev->bus_list))
> + struct pci_bus *bus = pdev->bus->parent;
> + /* Traverese the parent bus list to get
> + * pdev & dev for the sibling device.
> + */
> + while (bus) {
> + if (!list_empty(&bus->devices)) {
> + pdev = container_of(bus->devices.next,
> + struct pci_dev, bus_list);
pdev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
> + group = iommu_group_get(&pdev->dev);
> + break;
> + } else
> + bus = bus->parent;
Is this ever reached? Don't you always have bus->self?
> + }
> + } else {
> + /*
> + * Get the pdev & dev for the sibling device
> + */
> + pdev = container_of(pdev->bus_list.prev,
> + struct pci_dev, bus_list);
How do you know if you're at the head or tail of the list?
struct pci_dev *tmp;
list_for_each_entry(tmp, &pdev->bus_list, bus_list) {
if (tmp == pdev)
continue;
group = iommu_group_get(&tmp->dev);
break;
}
> + group = iommu_group_get(&pdev->dev);
> + }
> +
> + return group;
> +}
> +
> +static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
> +{
> + struct iommu_group *group = NULL;
> + struct pci_dev *bridge, *dma_pdev = NULL;
> + struct pci_controller *pci_ctl;
> + bool pci_endpt_partioning;
> +
> + pci_ctl = pci_bus_to_host(pdev->bus);
> + pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl);
> + /* We can partition PCIe devices so assign device group to the device */
> + if (pci_endpt_partioning) {
> + bridge = pci_find_upstream_pcie_bridge(pdev);
> + if (bridge) {
> + if (pci_is_pcie(bridge))
> + dma_pdev = pci_get_domain_bus_and_slot(
> + pci_domain_nr(pdev->bus),
> + bridge->subordinate->number, 0);
> + if (!dma_pdev)
> + dma_pdev = pci_dev_get(bridge);
> + } else
> + dma_pdev = pci_dev_get(pdev);
> +
> + /* Account for quirked devices */
> + swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
> +
> + /*
> + * If it's a multifunction device that does not support our
> + * required ACS flags, add to the same group as function 0.
> + */
See c14d2690 in Joerg's next tree, using function 0 was a poor
assumption.
> + if (dma_pdev->multifunction &&
> + !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS))
> + swap_pci_ref(&dma_pdev,
> + pci_get_slot(dma_pdev->bus,
> + PCI_DEVFN(PCI_SLOT(dma_pdev->devfn),
> + 0)));
> +
> + group = get_device_iommu_group(&pdev->dev);
> + pci_dev_put(pdev);
What was the point of all the above if we use pdev here instead of
dma_pdev? Wrong device and broken reference counting. This also isn't
testing ACS all the way up to the root complex or controller.
> + /*
> + * PCIe controller is not a paritionable entity
> + * free the controller device iommu_group.
> + */
> + if (pci_ctl->parent->iommu_group)
> + iommu_group_remove_device(pci_ctl->parent);
> + } else {
> + /*
> + * All devices connected to the controller will share the
> + * PCI controllers device group. If this is the first
> + * device to be probed for the pci controller, copy the
> + * device group information from the PCI controller device
> + * node and remove the PCI controller iommu group.
> + * For subsequent devices, the iommu group information can
> + * be obtained from sibling devices (i.e. from the bus_devices
> + * link list).
> + */
> + if (pci_ctl->parent->iommu_group) {
> + group = get_device_iommu_group(pci_ctl->parent);
> + iommu_group_remove_device(pci_ctl->parent);
> + } else
> + group = get_peer_pci_device_group(pdev);
> + }
> +
> + return group;
> +}
> +
> +static int fsl_pamu_add_device(struct device *dev)
> +{
> + struct iommu_group *group = NULL;
> + struct pci_dev *pdev;
> + const u32 *prop;
> + int ret, len;
> +
> + /*
> + * For platform devices we allocate a separate group for
> + * each of the devices.
> + */
> + if (dev->bus == &pci_bus_type) {
> + pdev = to_pci_dev(dev);
> + /* Don't create device groups for virtual PCI bridges */
> + if (pdev->subordinate)
> + return 0;
> +
> + group = get_pci_device_group(pdev);
> +
> + } else {
> + prop = of_get_property(dev->of_node, "fsl,liodn", &len);
> + if (prop)
> + group = get_device_iommu_group(dev);
> + }
> +
> + if (!group || IS_ERR(group))
> + return PTR_ERR(group);
> +
> + ret = iommu_group_add_device(group, dev);
> +
> + iommu_group_put(group);
> + return ret;
> +}
> +
> +static void fsl_pamu_remove_device(struct device *dev)
> +{
> + iommu_group_remove_device(dev);
> +}
> -----Original Message-----
> From: Alex Williamson [mailto:[email protected]]
> Sent: Tuesday, June 25, 2013 10:27 AM
> To: Sethi Varun-B16395
> Cc: [email protected]; [email protected]; linuxppc-
> [email protected]; [email protected];
> [email protected]; [email protected]; Yoder Stuart-B08248;
> Wood Scott-B07421; Timur Tabi
> Subject: Re: [PATCH 3/3 v16] iommu/fsl: Freescale PAMU driver and iommu
> implementation.
>
> On Thu, 2013-06-20 at 21:31 +0530, Varun Sethi wrote:
>
> > +#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR |
> PCI_ACS_UF)
> > +
> > +static struct iommu_group *get_device_iommu_group(struct device *dev)
> > +{
> > + struct iommu_group *group;
> > +
> > + group = iommu_group_get(dev);
> > + if (!group)
> > + group = iommu_group_alloc();
> > +
> > + return group;
> > +}
> > +
> [snip]
> > +
>
> This really gets parent or peer, right?
>
> > +static struct iommu_group *get_peer_pci_device_group(struct pci_dev
> > +*pdev) {
> > + struct iommu_group *group = NULL;
> > +
> > + /* check if this is the first device on the bus*/
> > + if (pdev->bus_list.next == pdev->bus_list.prev) {
>
> It's a list_head, use list functions. The list implementation should be
> treated as opaque.
>
> if (list_is_singular(&pdev->bus_list))
>
> > + struct pci_bus *bus = pdev->bus->parent;
> > + /* Traverese the parent bus list to get
> > + * pdev & dev for the sibling device.
> > + */
> > + while (bus) {
> > + if (!list_empty(&bus->devices)) {
> > + pdev = container_of(bus->devices.next,
> > + struct pci_dev, bus_list);
>
> pdev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
>
> > + group = iommu_group_get(&pdev->dev);
> > + break;
> > + } else
> > + bus = bus->parent;
>
> Is this ever reached? Don't you always have bus->self?
>
[Sethi Varun-B16395] Not sure I understand. Trying to get the group information from the parent bus, if there are no sibling devices on the current bus.
> > + }
> > + } else {
> > + /*
> > + * Get the pdev & dev for the sibling device
> > + */
> > + pdev = container_of(pdev->bus_list.prev,
> > + struct pci_dev, bus_list);
>
> How do you know if you're at the head or tail of the list?
>
> struct pci_dev *tmp;
> list_for_each_entry(tmp, &pdev->bus_list, bus_list) {
> if (tmp == pdev)
> continue;
>
> group = iommu_group_get(&tmp->dev);
> break;
> }
>
> > + group = iommu_group_get(&pdev->dev);
> > + }
> > +
> > + return group;
> > +}
> > +
> > +static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
> > +{
> > + struct iommu_group *group = NULL;
> > + struct pci_dev *bridge, *dma_pdev = NULL;
> > + struct pci_controller *pci_ctl;
> > + bool pci_endpt_partioning;
> > +
> > + pci_ctl = pci_bus_to_host(pdev->bus);
> > + pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl);
> > + /* We can partition PCIe devices so assign device group to the
> device */
> > + if (pci_endpt_partioning) {
> > + bridge = pci_find_upstream_pcie_bridge(pdev);
> > + if (bridge) {
> > + if (pci_is_pcie(bridge))
> > + dma_pdev = pci_get_domain_bus_and_slot(
> > + pci_domain_nr(pdev->bus),
> > + bridge->subordinate->number, 0);
> > + if (!dma_pdev)
> > + dma_pdev = pci_dev_get(bridge);
> > + } else
> > + dma_pdev = pci_dev_get(pdev);
> > +
> > + /* Account for quirked devices */
> > + swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
> > +
> > + /*
> > + * If it's a multifunction device that does not support our
> > + * required ACS flags, add to the same group as function 0.
> > + */
>
> See c14d2690 in Joerg's next tree, using function 0 was a poor
> assumption.
[Sethi Varun-B16395] ok.
>
> > + if (dma_pdev->multifunction &&
> > + !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS))
> > + swap_pci_ref(&dma_pdev,
> > + pci_get_slot(dma_pdev->bus,
> > + PCI_DEVFN(PCI_SLOT(dma_pdev-
> >devfn),
> > + 0)));
> > +
> > + group = get_device_iommu_group(&pdev->dev);
> > + pci_dev_put(pdev);
>
> What was the point of all the above if we use pdev here instead of
> dma_pdev? Wrong device and broken reference counting.
[Sethi Varun-B16395] Will fix this
This also isn't
> testing ACS all the way up to the root complex or controller.
[Sethi Varun-B16395] In our case the IOMMU can differentiate transactions based on the LIODN. The PCIe controller can generate a unique LIODN based on the bus,device,function number. I believe this would even be true for devices connected to a PCIe bridge (and not on the root bus). So, do we still need to check for ACS up to the root node?
-Varun
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On Wed, 2013-06-26 at 06:24 +0000, Sethi Varun-B16395 wrote:
>
> > -----Original Message-----
> > From: Alex Williamson [mailto:[email protected]]
> > Sent: Tuesday, June 25, 2013 10:27 AM
> > To: Sethi Varun-B16395
> > Cc: [email protected]; [email protected]; linuxppc-
> > [email protected]; [email protected];
> > [email protected]; [email protected]; Yoder Stuart-B08248;
> > Wood Scott-B07421; Timur Tabi
> > Subject: Re: [PATCH 3/3 v16] iommu/fsl: Freescale PAMU driver and iommu
> > implementation.
> >
> > On Thu, 2013-06-20 at 21:31 +0530, Varun Sethi wrote:
> >
> > > +#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR |
> > PCI_ACS_UF)
> > > +
> > > +static struct iommu_group *get_device_iommu_group(struct device *dev)
> > > +{
> > > + struct iommu_group *group;
> > > +
> > > + group = iommu_group_get(dev);
> > > + if (!group)
> > > + group = iommu_group_alloc();
> > > +
> > > + return group;
> > > +}
> > > +
> > [snip]
> > > +
> >
> > This really gets parent or peer, right?
> >
> > > +static struct iommu_group *get_peer_pci_device_group(struct pci_dev
> > > +*pdev) {
> > > + struct iommu_group *group = NULL;
> > > +
> > > + /* check if this is the first device on the bus*/
> > > + if (pdev->bus_list.next == pdev->bus_list.prev) {
> >
> > It's a list_head, use list functions. The list implementation should be
> > treated as opaque.
> >
> > if (list_is_singular(&pdev->bus_list))
> >
> > > + struct pci_bus *bus = pdev->bus->parent;
> > > + /* Traverese the parent bus list to get
> > > + * pdev & dev for the sibling device.
> > > + */
> > > + while (bus) {
> > > + if (!list_empty(&bus->devices)) {
> > > + pdev = container_of(bus->devices.next,
> > > + struct pci_dev, bus_list);
> >
> > pdev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
> >
> > > + group = iommu_group_get(&pdev->dev);
> > > + break;
> > > + } else
> > > + bus = bus->parent;
> >
> > Is this ever reached? Don't you always have bus->self?
> >
> [Sethi Varun-B16395] Not sure I understand. Trying to get the group
> information from the parent bus, if there are no sibling devices on
> the current bus.
I assume there's always a bridge on a bus, but maybe that bridge
(parent->self) is not in the list of parent->devices? Is that the case?
If not, then there's always a device on the bus, the bridge that created
it.
> > > + }
> > > + } else {
> > > + /*
> > > + * Get the pdev & dev for the sibling device
> > > + */
> > > + pdev = container_of(pdev->bus_list.prev,
> > > + struct pci_dev, bus_list);
> >
> > How do you know if you're at the head or tail of the list?
> >
> > struct pci_dev *tmp;
> > list_for_each_entry(tmp, &pdev->bus_list, bus_list) {
> > if (tmp == pdev)
> > continue;
> >
> > group = iommu_group_get(&tmp->dev);
> > break;
> > }
> >
> > > + group = iommu_group_get(&pdev->dev);
> > > + }
> > > +
> > > + return group;
> > > +}
> > > +
> > > +static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
> > > +{
> > > + struct iommu_group *group = NULL;
> > > + struct pci_dev *bridge, *dma_pdev = NULL;
> > > + struct pci_controller *pci_ctl;
> > > + bool pci_endpt_partioning;
> > > +
> > > + pci_ctl = pci_bus_to_host(pdev->bus);
> > > + pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl);
> > > + /* We can partition PCIe devices so assign device group to the
> > device */
> > > + if (pci_endpt_partioning) {
> > > + bridge = pci_find_upstream_pcie_bridge(pdev);
> > > + if (bridge) {
> > > + if (pci_is_pcie(bridge))
> > > + dma_pdev = pci_get_domain_bus_and_slot(
> > > + pci_domain_nr(pdev->bus),
> > > + bridge->subordinate->number, 0);
> > > + if (!dma_pdev)
> > > + dma_pdev = pci_dev_get(bridge);
> > > + } else
> > > + dma_pdev = pci_dev_get(pdev);
> > > +
> > > + /* Account for quirked devices */
> > > + swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
> > > +
> > > + /*
> > > + * If it's a multifunction device that does not support our
> > > + * required ACS flags, add to the same group as function 0.
> > > + */
> >
> > See c14d2690 in Joerg's next tree, using function 0 was a poor
> > assumption.
> [Sethi Varun-B16395] ok.
>
> >
> > > + if (dma_pdev->multifunction &&
> > > + !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS))
> > > + swap_pci_ref(&dma_pdev,
> > > + pci_get_slot(dma_pdev->bus,
> > > + PCI_DEVFN(PCI_SLOT(dma_pdev-
> > >devfn),
> > > + 0)));
> > > +
> > > + group = get_device_iommu_group(&pdev->dev);
> > > + pci_dev_put(pdev);
> >
> > What was the point of all the above if we use pdev here instead of
> > dma_pdev? Wrong device and broken reference counting.
> [Sethi Varun-B16395] Will fix this
>
> This also isn't
> > testing ACS all the way up to the root complex or controller.
> [Sethi Varun-B16395] In our case the IOMMU can differentiate
> transactions based on the LIODN. The PCIe controller can generate a
> unique LIODN based on the bus,device,function number. I believe this
> would even be true for devices connected to a PCIe bridge (and not on
> the root bus). So, do we still need to check for ACS up to the root
> node?
ACS is the PCI capability that tells us whether a device allows
peer-to-peer or requires all DMA to be forwarded upstream. At any step
along the way from an endpoint to the IOMMU the transaction can be
re-routed. We therefore need to test the ACS property not only of the
endpoint, but every device between the endpoint and the IOMMU to form
the IOMMU groups. An IOMMU cannot isolate a device if a DMA access is
re-routed by a link in the topology that prevents the IOMMU from even
being part of the transaction. Thanks,
Alex