On Mon, 19 Nov 2007 15:04:18 -0700
Alex Chiang <[email protected]> wrote:
> Documentation/accounting/getdelays.c | 43 +-
> Documentation/feature-removal-schedule.txt | 9 -
> Documentation/hwmon/sysfs-interface | 31 +
> Documentation/markers.txt | 6 +-
> <snip>
Clearly something went horrifically wrong here....
* Kristen Carlson Accardi <[email protected]>:
> On Mon, 19 Nov 2007 15:04:18 -0700
> Alex Chiang <[email protected]> wrote:
>
> > Documentation/accounting/getdelays.c | 43 +-
> > Documentation/feature-removal-schedule.txt | 9 -
> > Documentation/hwmon/sysfs-interface | 31 +
> > Documentation/markers.txt | 6 +-
> > <snip>
>
> Clearly something went horrifically wrong here....
Ugh, seems that stacked git got very confused when I did a
git-fetch && git-rebase origin. Also, guess it figures that I
shouldn't try and send a patch as I'm running out the door. :-/
Sorry about that.
Here is the correct version of Patch 4/4, v4. Note the small
changes in acpiphp and pciehp to disregard -EBUSY as an error
condition when returned from pci_hp_register. If you try and load
both drivers, whoever is in 2nd place will let you know that
another driver has already claimed the slot.
I didn't have the courage to go through and modify all the other
pcihp drivers, so if you have a system with both acpiphp and
shpcphp/cpciphp/etc., the dmesg output may be a little noisy (but
the behavior should be correct).
I'll have to digest Gary's recommendation for a boot-time kernel
option tomorrow.
Thanks.
From: Alex Chiang <[email protected]>
Detect all physical PCI slots as described by ACPI, and create
entries in /sys/bus/pci/slots/.
Not all physical slots are hotpluggable, and the acpiphp module
does not detect them. Now we know the physical PCI geography of
our system, without caring about hotplug.
v3 -> v4:
Always attempt to call pci_create_slot from pcihp_core to
cover cases of
a) user did not say Y to Kconfig option ACPI_PCI_SLOT
b) native PCIe hotplug driver registering on a
non-ACPI system.
Return -EBUSY if an hp driver attempts to register a slot
that is already registered to another driver. Do not
consider that to be an error condition in acpiphp and pciehp.
v2 -> v3:
Add Kconfig option to driver, allowing users to [de]config
this driver. If configured, take slightly different code
paths in pci_hp_register and pci_hp_deregister.
v1 -> v2:
Now recursively discovering p2p bridges and slots
underneath them. Hopefully, this will prevent us
from trying to register the same slot multiple times.
Signed-off-by: Alex Chiang <[email protected]>
---
drivers/acpi/Kconfig | 9 ++
drivers/acpi/Makefile | 1 +
drivers/acpi/pci_slot.c | 203 ++++++++++++++++++++++++++++++++
drivers/pci/hotplug/acpiphp_core.c | 2 +
drivers/pci/hotplug/acpiphp_glue.c | 7 +-
drivers/pci/hotplug/pci_hotplug_core.c | 22 +++-
drivers/pci/hotplug/pciehp_core.c | 11 ++-
drivers/pci/slot.c | 5 +
9 files changed, 256 insertions(+), 6 deletions(-)
create mode 100644 drivers/acpi/pci_slot.c
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ce9dead..c6da1e0 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -292,6 +292,15 @@ config ACPI_EC
the battery and thermal drivers. If you are compiling for a
mobile system, say Y.
+config ACPI_PCI_SLOT
+ bool "PCI slot detection driver"
+ default n
+ help
+ This driver will attempt to discover all PCI slots in your system,
+ and creates entries in /sys/bus/pci/slots/. This feature can
+ help you correlate PCI bus addresses with the physical geography
+ of your slots. If you are unsure, say N.
+
config ACPI_POWER
bool
default y
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 54e3ab0..d89000e 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_ACPI_DOCK) += dock.o
obj-$(CONFIG_ACPI_BAY) += bay.o
obj-$(CONFIG_ACPI_VIDEO) += video.o
obj-y += pci_root.o pci_link.o pci_irq.o pci_bind.o
+obj-$(CONFIG_ACPI_PCI_SLOT) += pci_slot.o
obj-$(CONFIG_ACPI_POWER) += power.o
obj-$(CONFIG_ACPI_PROCESSOR) += processor.o
obj-$(CONFIG_ACPI_CONTAINER) += container.o
diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
new file mode 100644
index 0000000..22f076b
--- /dev/null
+++ b/drivers/acpi/pci_slot.c
@@ -0,0 +1,203 @@
+/*
+ * pci_slot.c - ACPI PCI Slot Driver
+ *
+ * The code here is heavily leveraged from the acpiphp module.
+ * Thanks to Matthew Wilcox <[email protected]> for much guidance.
+ *
+ * Copyright (C) 2007 Alex Chiang <[email protected]>
+ * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
+ *
+ * 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 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, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+#define _COMPONENT ACPI_PCI_COMPONENT
+ACPI_MODULE_NAME("pci_slot");
+
+#define MY_NAME "pci_slot"
+#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
+#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
+
+static int acpi_pci_slot_add(acpi_handle handle);
+static void acpi_pci_slot_remove(acpi_handle handle);
+
+static struct acpi_pci_driver acpi_pci_slot_driver = {
+ .add = acpi_pci_slot_add,
+ .remove = acpi_pci_slot_remove,
+};
+
+/*
+ * register_slot - callback function to discover / create physical PCI slots
+ * @handle: any device underneath an acpi_pci_root (sometimes it's a slot
+ * device, sometimes not)
+ * @context: struct pci_bus
+ * The possible error conditions are non-fatal, so we always return
+ * AE_OK, as to not terminate our namespace walk prematurely.
+ */
+static acpi_status
+register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ int device;
+ unsigned long adr, sun;
+ acpi_status status;
+ char name[KOBJ_NAME_LEN];
+
+ struct pci_slot *pci_slot;
+ struct pci_bus *pci_bus = context;
+
+ status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+ device = (adr >> 16) & 0xffff;
+
+ /* No _SUN == not a slot == bail */
+ status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+
+ snprintf(name, sizeof(name), "%u", (u32)sun);
+ pci_slot = pci_create_slot(pci_bus, device, name);
+ if (IS_ERR(pci_slot)) {
+ err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
+ return AE_OK;
+ }
+
+ return AE_OK;
+}
+
+/*
+ * find_p2p_bridge - callback function to discover p2p bridges
+ */
+static acpi_status
+find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ int device, function;
+ unsigned long adr;
+ acpi_status status;
+ acpi_handle dummy_handle;
+
+ struct pci_dev *dev;
+ struct pci_bus *pci_bus = context;
+
+ status = acpi_get_handle(handle, "_ADR", &dummy_handle);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+
+ status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+
+ device = (adr >> 16) & 0xffff;
+ function = adr & 0xffff;
+
+ dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
+ if (!dev || !dev->subordinate)
+ goto out;
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+ register_slot, dev->subordinate, NULL);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+ find_p2p_bridge, dev->subordinate, NULL);
+out:
+ pci_dev_put(dev);
+ return AE_OK;
+}
+
+#define ACPI_STA_FUNCTIONING (0x00000008)
+
+/*
+ * acpi_pci_slot_add - walk namespace under a PCI root bridge
+ * @handle: points to an acpi_pci_root
+ */
+static int
+acpi_pci_slot_add(acpi_handle handle)
+{
+ int seg, bus;
+ unsigned long tmp;
+ acpi_status status;
+ acpi_handle dummy_handle;
+ struct pci_bus *pci_bus;
+
+ /* If the bridge doesn't have _STA, we assume it is always there */
+ status = acpi_get_handle(handle, "_STA", &dummy_handle);
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
+ if (ACPI_FAILURE(status)) {
+ info("%s: _STA evaluation failure\n", __FUNCTION__);
+ return 0;
+ }
+ if ((tmp & ACPI_STA_FUNCTIONING) == 0)
+ /* don't register this object */
+ return 0;
+ }
+
+ status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
+ seg = ACPI_SUCCESS(status) ? tmp : 0;
+
+ status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
+ bus = ACPI_SUCCESS(status) ? tmp : 0;
+
+ pci_bus = pci_find_bus(seg, bus);
+ if (!pci_bus)
+ return 0;
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+ register_slot, pci_bus, NULL);
+ if (ACPI_FAILURE(status)) {
+ err("%s: register_slot failure - %d\n", __FUNCTION__, status);
+ return status;
+ }
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+ find_p2p_bridge, pci_bus, NULL);
+ if (ACPI_FAILURE(status))
+ err("%s: find_p2p_bridge failure - %d\n", __FUNCTION__, status);
+
+ return status;
+}
+
+static int __init
+acpi_pci_slot_init(void)
+{
+ acpi_pci_register_driver(&acpi_pci_slot_driver);
+ return 0;
+}
+
+/*
+ * acpi_pci_slot_remove and acpi_pci_slot_exit are empty for now, since
+ * /sys/bus/pci/slots/ entries shouldn't ever really go away.
+ */
+static void
+acpi_pci_slot_remove(acpi_handle handle)
+{
+}
+
+static void __exit
+acpi_pci_slot_exit(void)
+{
+}
+
+module_init(acpi_pci_slot_init);
+module_exit(acpi_pci_slot_exit);
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index 34b8d0b..518dcd6 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -346,6 +346,8 @@ int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
retval = pci_hp_register(slot->hotplug_slot,
acpiphp_slot->bridge->pci_bus,
acpiphp_slot->device);
+ if (retval == -EBUSY)
+ goto error_hpslot;
if (retval) {
err("pci_hp_register failed with error %d\n", retval);
goto error_hpslot;
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 02a2fd7..bb0eada 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -259,7 +259,12 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
bridge->pci_bus->number, slot->device);
retval = acpiphp_register_hotplug_slot(slot);
if (retval) {
- warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
+ if (retval == -EBUSY)
+ warn("Slot %d already registered by another "
+ "hotplug driver\n", slot->sun);
+ else
+ warn("acpiphp_register_hotplug_slot failed "
+ "(err code = 0x%x)\n", retval);
goto err_exit;
}
}
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 1be5b0d..61ade06 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -567,6 +567,14 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr)
return -EINVAL;
}
+ /*
+ * No problems if we call this interface from both ACPI_PCI_SLOT
+ * driver and call it here again. If we've already created the
+ * pci_slot, the interface will just return without error.
+ *
+ * We need this second call if we haven't already created the
+ * pci_slot (in the case of native PCIe hp slot).
+ */
pci_slot = pci_create_slot(bus, slot_nr, slot->name);
if (IS_ERR(pci_slot))
return PTR_ERR(pci_slot);
@@ -581,7 +589,7 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr)
list_add(&slot->slot_list, &pci_hotplug_slot_list);
result = fs_add_slot(pci_slot);
- dbg ("Added slot %s to the list\n", slot->name);
+ dbg("Added slot %s to the list\n", slot->name);
return result;
}
@@ -610,8 +618,18 @@ int pci_hp_deregister(struct hotplug_slot *hotplug)
slot = hotplug->pci_slot;
fs_remove_slot(slot);
- pci_destroy_slot(slot);
dbg("Removed slot %s from the list\n", hotplug->name);
+#ifdef CONFIG_ACPI_PCI_SLOT
+ /*
+ * If we are using the ACPI-PCI slot driver, we don't want to
+ * destroy the pci_slot object. Rather, just release the
+ * hotplug_slot associated with it.
+ */
+ hotplug_release(slot);
+ slot->release = NULL;
+#else
+ pci_destroy_slot(slot);
+#endif
return 0;
}
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 19aa33e..299f6fa 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -246,8 +246,10 @@ static int init_slots(struct controller *ctrl)
retval = pci_hp_register(hotplug_slot,
ctrl->pci_dev->subordinate,
slot->device);
+ if (retval == -EBUSY)
+ goto error_info;
if (retval) {
- err ("pci_hp_register failed with error %d\n", retval);
+ err("pci_hp_register failed with error %d\n", retval);
goto error_info;
}
/* create additional sysfs entries */
@@ -452,7 +454,12 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_
/* Setup the slot information structures */
rc = init_slots(ctrl);
if (rc) {
- err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
+ if (rc == -EBUSY)
+ warn("%s: slot already registered by another "
+ "hotplug driver\n", PCIE_MODULE_NAME);
+ else
+ err("%s: slot initialization failed\n",
+ PCIE_MODULE_NAME);
goto err_out_release_ctlr;
}
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index f4ca61b..d2dc5dd 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -93,6 +93,11 @@ struct pci_slot *pci_slot_add_hotplug(struct pci_bus *parent, int slot_nr,
goto out;
}
+ if (slot->release) {
+ slot = ERR_PTR(-EBUSY);
+ goto out;
+ }
+
slot->release = release;
out:
up_write(&pci_bus_sem);
--
1.5.3.1.1.g1e61
On Mon, 19 Nov 2007, Alex Chiang wrote:
> Ugh, seems that stacked git got very confused when I did a
> git-fetch && git-rebase origin. Also, guess it figures that I
Being a very heavy stgit user myself, I have to say you must give up git
rebase on any stgit branch, and use stg rebase instead... otherwise, bad
things can, and do happen.
Also, don't trust the stgit release schedule, it is "release eventually" and
not something more sensible, like "release often". Instead, track the stgit
git tree.
I wish git learned to do the basic stgit's business by itself :(
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh