Latest revision after incorporating maintainer comments, mostly code
style and comments.
Is it too late to hope for a 4.4 inclusion? :)
v4 -> v5:
Updated struct comments to kernel-doc style.
Added comments to call out future work for enhanced irq sharing and
affinity mask settings.
Commended the potential list corruption if NMI, interrupt, and irq
teardown occur concurrently.
Using raw spinlock for irq list manipulation.
Fix IRQ flags: removed IRQF_SHARED.
Fixed the SoB in patch 1, added my Tested-by.
Keith Busch (5):
pci: skip child bus with conflicting resources
Export msi and irq functions for module use
x86-pci: allow pci domain specific dma ops
x86/pci: Initial commit for new VMD device driver
pciutils: Allow 32-bit domains
Jiang Liu (1):
msi: Relax msi_domain_alloc() to support parentless MSI irqdomains
arch/x86/Kconfig | 13 +
arch/x86/include/asm/device.h | 10 +
arch/x86/include/asm/hw_irq.h | 5 +
arch/x86/pci/Makefile | 2 +
arch/x86/pci/common.c | 38 +++
arch/x86/pci/vmd.c | 677 ++++++++++++++++++++++++++++++++++++++++++
drivers/pci/msi.c | 2 +
drivers/pci/probe.c | 10 +-
kernel/irq/irqdomain.c | 1 +
kernel/irq/msi.c | 8 +-
10 files changed, 761 insertions(+), 5 deletions(-)
create mode 100644 arch/x86/pci/vmd.c
--
2.6.2.307.g37023ba
From: Liu Jiang <[email protected]>
Previously msi_domain_alloc() assumes MSI irqdomains always have parent
irqdomains, but that's not true for the new Intel VMD devices. So relax
msi_domain_alloc() to support parentless MSI irqdomains.
Signed-off-by: Jiang Liu <[email protected]>
Tested-by: Keith Busch <[email protected]>
---
kernel/irq/msi.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 6b0c0b7..5e15cb4 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -109,9 +109,11 @@ static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
if (irq_find_mapping(domain, hwirq) > 0)
return -EEXIST;
- ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
- if (ret < 0)
- return ret;
+ if (domain->parent) {
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
+ if (ret < 0)
+ return ret;
+ }
for (i = 0; i < nr_irqs; i++) {
ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
--
2.6.2.307.g37023ba
And use the max bus resource from the parent rather than assume 255.
Signed-off-by: Keith Busch <[email protected]>
---
drivers/pci/probe.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f14a970..ae5a4b3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -856,7 +856,10 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
if (!child)
goto out;
child->primary = primary;
- pci_bus_insert_busn_res(child, secondary, subordinate);
+ if (!pci_bus_insert_busn_res(child, secondary, subordinate)) {
+ pci_remove_bus(child);
+ goto out;
+ }
child->bridge_ctl = bctl;
}
@@ -896,7 +899,10 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
child = pci_add_new_bus(bus, dev, max+1);
if (!child)
goto out;
- pci_bus_insert_busn_res(child, max+1, 0xff);
+ if (!pci_bus_insert_busn_res(child, max+1, bus->busn_res.end)) {
+ pci_remove_bus(child);
+ goto out;
+ }
}
max++;
buses = (buses & 0xff000000)
--
2.6.2.307.g37023ba
Signed-off-by: Keith Busch <[email protected]>
---
drivers/pci/msi.c | 2 ++
kernel/irq/irqdomain.c | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 45a5148..1aa1ad4 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1120,6 +1120,7 @@ struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
return to_pci_dev(desc->dev);
}
+EXPORT_SYMBOL_GPL(msi_desc_to_pci_dev);
void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
@@ -1279,6 +1280,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
domain->bus_token = DOMAIN_BUS_PCI_MSI;
return domain;
}
+EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
/**
* pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 22aa961..ca05cc8 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1058,6 +1058,7 @@ void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
__irq_set_handler(virq, handler, 0, handler_name);
irq_set_handler_data(virq, handler_data);
}
+EXPORT_SYMBOL(irq_domain_set_info);
/**
* irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
--
2.6.2.307.g37023ba
New x86 pci h/w will require dma operations specific to that domain. This
patch allows those domains to register their operations, and sets devices
as they are discovere3d in that domain to use them.
Signed-off-by: Keith Busch <[email protected]>
---
arch/x86/include/asm/device.h | 10 ++++++++++
arch/x86/pci/common.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h
index 03dd729..3b23897 100644
--- a/arch/x86/include/asm/device.h
+++ b/arch/x86/include/asm/device.h
@@ -10,6 +10,16 @@ struct dev_archdata {
#endif
};
+#if defined(CONFIG_X86_DEV_DMA_OPS) && defined(CONFIG_PCI_DOMAINS)
+struct dma_domain {
+ struct list_head node;
+ struct dma_map_ops *dma_ops;
+ int domain_nr;
+};
+extern void add_dma_domain(struct dma_domain *domain);
+extern void del_dma_domain(struct dma_domain *domain);
+#endif
+
struct pdev_archdata {
};
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index dc78a4a..e227ba2 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -641,6 +641,43 @@ unsigned int pcibios_assign_all_busses(void)
return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
}
+#if defined(CONFIG_X86_DEV_DMA_OPS) && defined(CONFIG_PCI_DOMAINS)
+LIST_HEAD(dma_domain_list);
+DEFINE_SPINLOCK(dma_domain_list_lock);
+
+void add_dma_domain(struct dma_domain *domain)
+{
+ spin_lock(&dma_domain_list_lock);
+ list_add(&domain->node, &dma_domain_list);
+ spin_unlock(&dma_domain_list_lock);
+}
+EXPORT_SYMBOL_GPL(add_dma_domain);
+
+void del_dma_domain(struct dma_domain *domain)
+{
+ spin_lock(&dma_domain_list_lock);
+ list_del(&domain->node);
+ spin_unlock(&dma_domain_list_lock);
+}
+EXPORT_SYMBOL_GPL(del_dma_domain);
+
+static void set_dma_domain_ops(struct pci_dev *pdev)
+{
+ struct dma_domain *domain;
+
+ spin_lock(&dma_domain_list_lock);
+ list_for_each_entry(domain, &dma_domain_list, node) {
+ if (pci_domain_nr(pdev->bus) == domain->domain_nr) {
+ pdev->dev.archdata.dma_ops = domain->dma_ops;
+ break;
+ }
+ }
+ spin_unlock(&dma_domain_list_lock);
+}
+#else
+static void set_dma_domain_ops(struct pci_dev *pdev) {}
+#endif
+
int pcibios_add_device(struct pci_dev *dev)
{
struct setup_data *data;
@@ -670,6 +707,7 @@ int pcibios_add_device(struct pci_dev *dev)
pa_data = data->next;
iounmap(data);
}
+ set_dma_domain_ops(dev);
return 0;
}
--
2.6.2.307.g37023ba
The Intel Volume Management Device (VMD) is an integrated endpoint on the
platform's PCIe root complex that acts as a host bridge to a secondary
PCIe domain. BIOS can reassign one or more root ports to appear within
a VMD domain instead of the primary domain. The immediate benefit is
that additional PCI-e domains allow more than 256 buses in a system by
letting bus number be reused across different domains.
VMD domains do not define ACPI _SEG, so to avoid domain clashing with
host bridges defining this segment, VMD domains start at 0x10000 which
is greater than the highest possible 16-bit ACPI defined _SEG.
This driver enumerates and enables the domain using the root bus
configuration interface provided by the PCI subsystem. The driver
provides configuration space accessor functions (pci_ops), bus and
memory resources, an MSI irq domain with irq_chip implementation, and
dma operations necessary to use devices in through the VMD endpoint's
interface.
VMD routes I/O as follows:
1) Configuration Space: BAR 0 ("CFGBAR") of VMD provides the base
address and size for configuration space register access to VMD-owned
root ports. It works similarly to MMCONFIG for extended configuration
space. Bus numbering is independent and does not conflict with the
primary domain.
2) MMIO Space: BARs 2 and 4 ("MEMBAR1" and "MEMBAR2") of VMD provide
the base address, size, and type for MMIO register access. These
addresses are not translated by VMD hardware; they are simply
reservations to be distributed to root ports' memory base/limit
registers and subdivided among devices downstream.
3) DMA: To interact appropriately with IOMMU, the source ID DMA read
and write requests are translated to the bus-device-function of the
VMD endpoint. Otherwise, DMA operates normally without VMD-specific
address translation.
4) Interrupts: Part of VMD's BAR 4 is reserved for VMD's MSI-X Table
and PBA. MSIs from VMD domain devices and ports are remapped to appear
if they were issued using one of VMD's MSI-X table entries. Each MSI
and MSI-X addresses of VMD-owned devices and ports have a special
format where the address refers to specific entries in VMD's MSI-X
table. As with DMA, the interrupt source id is translated to VMD's
bus-device-function.
The driver provides its own MSI and MSI-X configuration functions
specific to how MSI messages are used within the VMD domain,
and provides an irq_chip for independent IRQ allocation to relay
interrupts from VMD's interrupt handler to the appropriate device
driver's handler.
5) Errors: PCIe error message are intercepted by the root ports
normally (e.g. AER), except with VMD, system errors (i.e. firmware
first) are disabled by default. AER and hotplug interrupts are
translated in the same way as endpoint interrupts.
6) VMD does not support INTx interrupts or IO ports. Devices or drivers
requiring these features should either not be placed below VMD-owned
root ports, or VMD should be disabled by BIOS for such endpoints.
Signed-off-by: Keith Busch <[email protected]>
---
arch/x86/Kconfig | 13 +
arch/x86/include/asm/hw_irq.h | 5 +
arch/x86/pci/Makefile | 2 +
arch/x86/pci/vmd.c | 677 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 697 insertions(+)
create mode 100644 arch/x86/pci/vmd.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index db3622f..9a5ab69 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2665,6 +2665,19 @@ config PMC_ATOM
def_bool y
depends on PCI
+config VMD
+ depends on PCI_MSI
+ tristate "Volume Management Device Driver"
+ default N
+ ---help---
+ Adds support for the Intel Volume Manage Device (VMD). VMD is a
+ secondary PCI host bridge that allows PCI Express root ports,
+ and devices attached to them, to be removed from the default
+ PCI domain and placed within the VMD domain. This provides
+ additional bus resources than are otherwise possible with a
+ single domain. If you know your system provides one of these and
+ have devices attached to it, say Y; if you are not sure, say N.
+
source "net/Kconfig"
source "drivers/Kconfig"
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 1e3408e..79c35c4 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -108,6 +108,11 @@ struct irq_alloc_info {
struct IO_APIC_route_entry *ioapic_entry;
};
#endif
+#if IS_ENABLED(CONFIG_VMD)
+ struct {
+ struct msi_desc *desc;
+ };
+#endif
#ifdef CONFIG_DMAR_TABLE
struct {
int dmar_id;
diff --git a/arch/x86/pci/Makefile b/arch/x86/pci/Makefile
index 5c6fc35..97062a6 100644
--- a/arch/x86/pci/Makefile
+++ b/arch/x86/pci/Makefile
@@ -23,6 +23,8 @@ obj-y += bus_numa.o
obj-$(CONFIG_AMD_NB) += amd_bus.o
obj-$(CONFIG_PCI_CNB20LE_QUIRK) += broadcom_bus.o
+obj-$(CONFIG_VMD) += vmd.o
+
ifeq ($(CONFIG_PCI_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
endif
diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
new file mode 100644
index 0000000..52a0061
--- /dev/null
+++ b/arch/x86/pci/vmd.c
@@ -0,0 +1,677 @@
+/*
+ * Volume Management Device driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+
+#include <asm/irqdomain.h>
+#include <asm/device.h>
+#include <asm/msi.h>
+#include <asm/msidef.h>
+
+/*
+ * Lock for manipulating vmd irq lists.
+ */
+static DEFINE_RAW_SPINLOCK(list_lock);
+
+/**
+ * struct vmd_irq - private data to map driver irq to the VMD shared vector
+ * @node: list item for parent traversal.
+ * @rcu: rcu callback item for freeing.
+ * @irq: back pointer to parent.
+ * @virq: the virtual irq value provided to the requesting driver.
+ *
+ * Every MSI/MSI-x irq requested for a device in a VMD domain will be mapped to
+ * a VMD irq using this structure.
+ */
+struct vmd_irq {
+ struct list_head node;
+ struct rcu_head rcu;
+ struct vmd_irq_list *irq;
+ unsigned int virq;
+};
+
+/**
+ * struct vmd_irq_list - list of driver requested irq's mapping to a vmd vector
+ * &irq_list: list of child irq's the VMD one demuxes to.
+ * &vmd_vector: the h/w irq assigned to the VMD device.
+ * &index: index into the VMD MSI-x table; used for message routing.
+ * &count: number of child irqs assigned to this vector; used to track
+ * sharing.
+ */
+struct vmd_irq_list {
+ struct list_head irq_list;
+ unsigned int vmd_vector;
+ unsigned int index;
+ unsigned int count;
+};
+
+struct vmd_dev {
+ struct pci_dev *dev;
+
+ spinlock_t cfg_lock;
+ char __iomem *cfgbar;
+
+ int msix_count;
+ struct msix_entry *msix_entries;
+ struct vmd_irq_list *irqs;
+
+ struct pci_sysdata sysdata;
+ struct resource resources[3];
+ struct irq_domain *irq_domain;
+ struct pci_bus *bus;
+
+#ifdef CONFIG_X86_DEV_DMA_OPS
+ struct dma_map_ops dma_ops;
+ struct dma_domain dma_domain;
+#endif
+};
+
+static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
+{
+ return container_of(bus->sysdata, struct vmd_dev, sysdata);
+}
+
+/*
+ * Drivers managing a device in a VMD domain allocate their own irqs as before,
+ * but the MSI entry for the hardware it's driving will be programmed with a
+ * destination id for the VMD MSI-x table. The VMD device muxes interrupts in
+ * its domain into one of its own, and the VMD driver de-muxes these for the
+ * handlers sharing that VMD irq. The vmd irq_domain provides the operations
+ * and irq_chip to set this up.
+ */
+static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+ struct vmd_irq_list *irq = vmdirq->irq;
+
+ msg->address_hi = MSI_ADDR_BASE_HI;
+ msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_DEST_ID(irq->index);
+ msg->data = 0;
+}
+
+/*
+ * We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the irq mask/unmask ops.
+ */
+static void vmd_irq_enable(struct irq_data *data)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+
+ raw_spin_lock(&list_lock);
+ list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
+ raw_spin_unlock(&list_lock);
+
+ data->chip->irq_unmask(data);
+}
+
+static void vmd_irq_disable(struct irq_data *data)
+{
+ struct vmd_irq *vmdirq = data->chip_data;
+
+ data->chip->irq_mask(data);
+
+ raw_spin_lock(&list_lock);
+ list_del_rcu(&vmdirq->node);
+ raw_spin_unlock(&list_lock);
+}
+
+/*
+ * XXX: Stubbed until we develop acceptable way to not create conflicts with
+ * other devices sharing the same vector.
+ */
+static int vmd_irq_set_affinity(struct irq_data *data, const struct cpumask *dest,
+ bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip vmd_msi_controller = {
+ .name = "VMD-MSI",
+ .irq_enable = vmd_irq_enable,
+ .irq_disable = vmd_irq_disable,
+ .irq_compose_msi_msg = vmd_compose_msi_msg,
+ .irq_set_affinity = vmd_irq_set_affinity,
+};
+
+static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
+ msi_alloc_info_t *arg)
+{
+ return 0;
+}
+
+/*
+ * XXX: We can be even smarter selecting the best irq once we solve the
+ * affinity problem.
+ */
+static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd)
+{
+ int i, best = 0;
+
+ raw_spin_lock(&list_lock);
+ for (i = 1; i < vmd->msix_count; i++)
+ if (vmd->irqs[i].count < vmd->irqs[best].count)
+ best = i;
+ vmd->irqs[best].count++;
+ raw_spin_unlock(&list_lock);
+
+ return &vmd->irqs[best];
+}
+
+static int vmd_msi_init(struct irq_domain *domain,
+ struct msi_domain_info *info,
+ unsigned int virq, irq_hw_number_t hwirq,
+ msi_alloc_info_t *arg)
+{
+ struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(arg->desc)->bus);
+ struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
+
+ if (!vmdirq)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&vmdirq->node);
+ vmdirq->irq = vmd_next_irq(vmd);
+ vmdirq->virq = virq;
+
+ irq_domain_set_info(domain, virq, vmdirq->irq->vmd_vector,
+ info->chip, vmdirq, handle_simple_irq, vmd, NULL);
+ return 0;
+}
+
+static void vmd_msi_free(struct irq_domain *domain,
+ struct msi_domain_info *info,
+ unsigned int virq)
+{
+ struct vmd_irq *vmdirq = irq_get_chip_data(virq);
+
+ /* XXX: Potential optimization to rebalance */
+ raw_spin_lock(&list_lock);
+ vmdirq->irq->count--;
+ raw_spin_unlock(&list_lock);
+
+ kfree_rcu(vmdirq, rcu);
+}
+
+static int vmd_msi_prepare(struct irq_domain *domain,
+ struct device *dev, int nvec,
+ msi_alloc_info_t *arg)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
+
+ if (nvec > vmd->msix_count)
+ return vmd->msix_count;
+ memset(arg, 0, sizeof(*arg));
+ return 0;
+}
+
+static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->desc = desc;
+}
+
+static struct msi_domain_ops vmd_msi_domain_ops = {
+ .get_hwirq = vmd_get_hwirq,
+ .msi_init = vmd_msi_init,
+ .msi_free = vmd_msi_free,
+ .msi_prepare = vmd_msi_prepare,
+ .set_desc = vmd_set_desc,
+};
+
+static struct msi_domain_info vmd_msi_domain_info = {
+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX,
+ .ops = &vmd_msi_domain_ops,
+ .chip = &vmd_msi_controller,
+};
+
+#ifdef CONFIG_X86_DEV_DMA_OPS
+/*
+ * VMD replaces the requester id with its own. DMA mappings for devices in a
+ * VMD domain need to be mapped for the VMD device, not the device requiring
+ * the mapping.
+ */
+static struct device *dev_to_vmd_dev(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
+ return &vmd->dev->dev;
+}
+
+static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
+ gfp_t flag, struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->alloc(vdev, size, addr, flag, attrs);
+}
+
+static void vmd_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t addr, struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->free(vdev, size, vaddr, addr, attrs);
+}
+
+static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t addr,
+ size_t size, struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->mmap(vdev, vma, cpu_addr, addr, size,
+ attrs);
+}
+
+static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
+ void *cpu_addr, dma_addr_t addr,
+ size_t size, struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->get_sgtable(vdev, sgt, cpu_addr, addr,
+ size, attrs);
+}
+
+static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->map_page(vdev, page, offset, size, dir,
+ attrs);
+}
+
+static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->unmap_page(vdev, addr, size, dir, attrs);
+}
+
+static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->map_sg(vdev, sg, nents, dir, attrs);
+}
+
+static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->unmap_sg(vdev, sg, nents, dir, attrs);
+}
+
+static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->sync_single_for_cpu(vdev, addr, size, dir);
+}
+
+static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->sync_single_for_device(vdev, addr, size, dir);
+}
+
+static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->sync_sg_for_cpu(vdev, sg, nents, dir);
+}
+
+static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ vdev->archdata.dma_ops->sync_sg_for_device(vdev, sg, nents, dir);
+}
+
+static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->mapping_error(vdev, addr);
+}
+
+static int vmd_dma_supported(struct device *dev, u64 mask)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->dma_supported(vdev, mask);
+}
+
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+u64 vmd_get_required_mask(struct device *dev)
+{
+ struct device *vdev = dev_to_vmd_dev(dev);
+ return vdev->archdata.dma_ops->get_required_mask(vdev);
+}
+#endif
+
+static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
+{
+ struct dma_domain *domain = &vmd->dma_domain;
+
+ if (vmd->dev->dev.archdata.dma_ops)
+ del_dma_domain(domain);
+}
+
+#define ASSIGN_VMD_DMA_OPS(source, dest, fn) \
+ if (source->fn) dest->fn = vmd_##fn;
+static void vmd_setup_dma_ops(struct vmd_dev *vmd)
+{
+ struct dma_domain *domain = &vmd->dma_domain;
+ struct dma_map_ops *source = vmd->dev->dev.archdata.dma_ops;
+ struct dma_map_ops *dest = &vmd->dma_ops;
+
+ domain->domain_nr = vmd->sysdata.domain;
+ domain->dma_ops = dest;
+
+ if (!source)
+ return;
+ ASSIGN_VMD_DMA_OPS(source, dest, alloc);
+ ASSIGN_VMD_DMA_OPS(source, dest, free);
+ ASSIGN_VMD_DMA_OPS(source, dest, mmap);
+ ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
+ ASSIGN_VMD_DMA_OPS(source, dest, map_page);
+ ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
+ ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
+ ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
+ ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
+ ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
+ ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
+ ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
+ ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
+ ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+ ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
+#endif
+ add_dma_domain(domain);
+}
+#undef ASSIGN_VMD_DMA_OPS
+#else
+static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
+static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
+#endif
+
+/*
+ * CPU may deadlock if config space is not serialized on some versions of this
+ * hardware, so all config space access is done under a spinlock.
+ */
+static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
+ int len, u32 *value)
+{
+ int ret = 0;
+ unsigned long flags;
+ struct vmd_dev *vmd = vmd_from_bus(bus);
+ char __iomem *addr = vmd->cfgbar + (bus->number << 20) +
+ (devfn << 12) + reg;
+
+ if ((addr - vmd->cfgbar) + len >= resource_size(&vmd->dev->resource[0]))
+ return -EFAULT;
+
+ spin_lock_irqsave(&vmd->cfg_lock, flags);
+ switch (len) {
+ case 1:
+ *value = readb(addr);
+ break;
+ case 2:
+ *value = readw(addr);
+ break;
+ case 4:
+ *value = readl(addr);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ spin_unlock_irqrestore(&vmd->cfg_lock, flags);
+ return ret;
+}
+
+/*
+ * VMD h/w converts posted config writes to non-posted. The read-back in this
+ * function forces the completion so it returns only after the config space was
+ * written, as expected.
+ */
+static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
+ int len, u32 value)
+{
+ int ret = 0;
+ unsigned long flags;
+ struct vmd_dev *vmd = vmd_from_bus(bus);
+ char __iomem *addr = vmd->cfgbar + (bus->number << 20) +
+ (devfn << 12) + reg;
+
+ if ((addr - vmd->cfgbar) + len >= resource_size(&vmd->dev->resource[0]))
+ return -EFAULT;
+
+ spin_lock_irqsave(&vmd->cfg_lock, flags);
+ switch (len) {
+ case 1:
+ writeb(value, addr);
+ readb(addr);
+ break;
+ case 2:
+ writew(value, addr);
+ readw(addr);
+ break;
+ case 4:
+ writel(value, addr);
+ readl(addr);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ spin_unlock_irqrestore(&vmd->cfg_lock, flags);
+ return ret;
+}
+
+static struct pci_ops vmd_ops = {
+ .read = vmd_pci_read,
+ .write = vmd_pci_write,
+};
+
+/*
+ * VMD domains start at 10000h to not clash with domains defining ACPI _SEG.
+ */
+static int vmd_find_free_domain(void)
+{
+ int domain = 0xffff;
+ struct pci_bus *bus = NULL;
+
+ while ((bus = pci_find_next_bus(bus)) != NULL)
+ domain = max_t(int, domain, pci_domain_nr(bus));
+ return domain + 1;
+}
+
+static int vmd_enable_domain(struct vmd_dev *vmd)
+{
+ struct pci_sysdata *sd = &vmd->sysdata;
+ LIST_HEAD(resources);
+
+ vmd->resources[0] = (struct resource) {
+ .name = "VMD CFGBAR",
+ .start = 0,
+ .end = (resource_size(&vmd->dev->resource[0]) >> 20) - 1,
+ .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
+ };
+ vmd->resources[1] = (struct resource) {
+ .name = "VMD MEMBAR1",
+ .start = vmd->dev->resource[2].start,
+ .end = vmd->dev->resource[2].end,
+ .flags = (vmd->dev->resource[2].flags & ~IORESOURCE_SIZEALIGN) &
+ (!upper_32_bits(vmd->dev->resource[2].end) ?
+ ~IORESOURCE_MEM_64 : ~0),
+ };
+ vmd->resources[2] = (struct resource) {
+ .name = "VMD MEMBAR2",
+ .start = vmd->dev->resource[4].start + 0x2000,
+ .end = vmd->dev->resource[4].end,
+ .flags = (vmd->dev->resource[4].flags & ~IORESOURCE_SIZEALIGN) &
+ (!upper_32_bits(vmd->dev->resource[4].end) ?
+ ~IORESOURCE_MEM_64 : ~0),
+ };
+
+ sd->domain = vmd_find_free_domain();
+ if (sd->domain < 0)
+ return sd->domain;
+ sd->node = pcibus_to_node(vmd->dev->bus);
+
+ vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
+ NULL);
+ if (!vmd->irq_domain)
+ return -ENODEV;
+
+ pci_add_resource(&resources, &vmd->resources[0]);
+ pci_add_resource(&resources, &vmd->resources[1]);
+ pci_add_resource(&resources, &vmd->resources[2]);
+ vmd->bus = pci_create_root_bus(NULL, 0, &vmd_ops, sd, &resources);
+ if (!vmd->bus) {
+ pci_free_resource_list(&resources);
+ irq_domain_remove(vmd->irq_domain);
+ return -ENODEV;
+ }
+
+ vmd_setup_dma_ops(vmd);
+ dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+ pci_rescan_bus(vmd->bus);
+
+ WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj, "domain"),
+ "Can't create symlink to domain\n");
+ return 0;
+}
+
+/*
+ * XXX: potential corruption if NMI occurs when irq handler is walking this
+ * list and irq deletion occurs concurrently.
+ */
+static irqreturn_t vmd_irq(int irq, void *data)
+{
+ struct vmd_irq_list *irqs = data;
+ struct vmd_irq *vmdirq;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
+ generic_handle_irq(vmdirq->virq);
+ rcu_read_unlock();
+
+ return IRQ_HANDLED;
+}
+
+static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ struct vmd_dev *vmd;
+ int i, err;
+
+ if (resource_size(&dev->resource[0]) < (1 << 20))
+ return -ENOMEM;
+
+ vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
+ if (!vmd)
+ return -ENOMEM;
+
+ vmd->dev = dev;
+ err = pcim_enable_device(dev);
+ if (err < 0)
+ return err;
+
+ vmd->cfgbar = pcim_iomap(dev, 0, 0);
+ if (!vmd->cfgbar)
+ return -ENOMEM;
+
+ pci_set_master(dev);
+ if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
+ dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
+ return -ENODEV;
+
+ vmd->msix_count = pci_msix_vec_count(dev);
+ if (vmd->msix_count < 0)
+ return -ENODEV;
+
+ vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
+ GFP_KERNEL);
+ if (!vmd->irqs)
+ return -ENOMEM;
+
+ vmd->msix_entries = devm_kcalloc(&dev->dev, vmd->msix_count,
+ sizeof(*vmd->msix_entries), GFP_KERNEL);
+ if(!vmd->msix_entries)
+ return -ENOMEM;
+ for (i = 0; i < vmd->msix_count; i++)
+ vmd->msix_entries[i].entry = i;
+
+ vmd->msix_count = pci_enable_msix_range(vmd->dev, vmd->msix_entries, 1,
+ vmd->msix_count);
+ if (vmd->msix_count < 0)
+ return vmd->msix_count;
+
+ for (i = 0; i < vmd->msix_count; i++) {
+ INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
+ vmd->irqs[i].vmd_vector = vmd->msix_entries[i].vector;
+ vmd->irqs[i].index = i;
+
+ err = devm_request_irq(&dev->dev, vmd->irqs[i].vmd_vector,
+ vmd_irq, 0, "vmd", &vmd->irqs[i]);
+ if (err)
+ return err;
+ }
+ spin_lock_init(&vmd->cfg_lock);
+ pci_set_drvdata(dev, vmd);
+ err = vmd_enable_domain(vmd);
+ if (err)
+ return err;
+ return 0;
+}
+
+static void vmd_remove(struct pci_dev *dev)
+{
+ struct vmd_dev *vmd = pci_get_drvdata(dev);
+
+ pci_set_drvdata(dev, NULL);
+ sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
+ pci_stop_root_bus(vmd->bus);
+ pci_remove_root_bus(vmd->bus);
+ vmd_teardown_dma_ops(vmd);
+ irq_domain_remove(vmd->irq_domain);
+}
+
+static const struct pci_device_id vmd_ids[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, vmd_ids);
+
+static struct pci_driver vmd_drv = {
+ .name = "vmd",
+ .id_table = vmd_ids,
+ .probe = vmd_probe,
+ .remove = vmd_remove,
+};
+module_pci_driver(vmd_drv);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.4");
--
2.6.2.307.g37023ba
PCI-e segments will continue to use the lower 16 bits as required by
ACPI. Special domains may use the full 32-bits.
Signed-off-by: Keith Busch <[email protected]>
---
lib/filter.c | 2 +-
lib/pci.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/filter.c b/lib/filter.c
index d4254a0..075dc2f 100644
--- a/lib/filter.c
+++ b/lib/filter.c
@@ -45,7 +45,7 @@ pci_filter_parse_slot_v33(struct pci_filter *f, char *str)
if (str[0] && strcmp(str, "*"))
{
long int x = strtol(str, &e, 16);
- if ((e && *e) || (x < 0 || x > 0xffff))
+ if ((e && *e) || (x < 0))
return "Invalid domain number";
f->domain = x;
}
diff --git a/lib/pci.h b/lib/pci.h
index 10ba831..7e42765 100644
--- a/lib/pci.h
+++ b/lib/pci.h
@@ -119,7 +119,7 @@ struct pci_param *pci_walk_params(struct pci_access *acc, struct pci_param *prev
struct pci_dev {
struct pci_dev *next; /* Next device in the chain */
- u16 domain; /* PCI domain (host bridge) */
+ int32_t domain; /* PCI domain (host bridge) */
u8 bus, dev, func; /* Bus inside domain, device and function */
/* These fields are set by pci_fill_info() */
--
1.7.10.4
On Fri, 13 Nov 2015, Keith Busch wrote:
> Latest revision after incorporating maintainer comments, mostly code
> style and comments.
>
> Is it too late to hope for a 4.4 inclusion? :)
Hope dies last :)
On Fri, 13 Nov 2015, Keith Busch wrote:
> From: Liu Jiang <[email protected]>
>
> Previously msi_domain_alloc() assumes MSI irqdomains always have parent
> irqdomains, but that's not true for the new Intel VMD devices. So relax
> msi_domain_alloc() to support parentless MSI irqdomains.
>
> Signed-off-by: Jiang Liu <[email protected]>
> Tested-by: Keith Busch <[email protected]>
Just for the record. This still misses your S-O-B as you are conveying
the patch
Thanks,
tglx
On Fri, 13 Nov 2015, Keith Busch wrote:
> +/**
> + * struct vmd_irq_list - list of driver requested irq's mapping to a vmd vector
> + * &irq_list: list of child irq's the VMD one demuxes to.
Is "&" a new KernelDoc mechanism?
> +/*
> + * XXX: potential corruption if NMI occurs when irq handler is walking this
> + * list and irq deletion occurs concurrently.
I'm going to fix that before the driver hits the tree.
Thanks,
tglx
On Fri, Nov 13, 2015 at 04:27:07PM -0500, Thomas Gleixner wrote:
> On Fri, 13 Nov 2015, Keith Busch wrote:
> > +/**
> > + * struct vmd_irq_list - list of driver requested irq's mapping to a vmd vector
> > + * &irq_list: list of child irq's the VMD one demuxes to.
>
> Is "&" a new KernelDoc mechanism?
Curses!
It's a typo in my vi macro. So much for trying to be clever to save a
whole 20 seconds of manual typing...