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Merge branches 'pci/hotplug', 'pci/pci_is_bridge' and 'pci/virtualization' into next

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* pci/hotplug:
  PCI: cpqphp: Fix possible null pointer dereference
  NVMe: Implement PCIe reset notification callback
  PCI: Notify driver before and after device reset

* pci/pci_is_bridge:
  pcmcia: Use pci_is_bridge() to simplify code
  PCI: pciehp: Use pci_is_bridge() to simplify code
  PCI: acpiphp: Use pci_is_bridge() to simplify code
  PCI: cpcihp: Use pci_is_bridge() to simplify code
  PCI: shpchp: Use pci_is_bridge() to simplify code
  PCI: rpaphp: Use pci_is_bridge() to simplify code
  sparc/PCI: Use pci_is_bridge() to simplify code
  powerpc/PCI: Use pci_is_bridge() to simplify code
  ia64/PCI: Use pci_is_bridge() to simplify code
  x86/PCI: Use pci_is_bridge() to simplify code
  PCI: Use pci_is_bridge() to simplify code
  PCI: Add new pci_is_bridge() interface
  PCI: Rename pci_is_bridge() to pci_has_subordinate()

* pci/virtualization:
  PCI: Introduce new device binding path using pci_dev.driver_override

Conflicts:
	drivers/pci/pci-sysfs.c
This commit is contained in:
Bjorn Helgaas 2014-05-28 16:21:07 -06:00
commit d1a2523d2a
22 changed files with 154 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
Documentation/ABI/testing/sysfs-bus-pci
View File

@ -250,3 +250,24 @@ Description:
valid. For example, writing a 2 to this file when sriov_numvfs
is not 0 and not 2 already will return an error. Writing a 10
when the value of sriov_totalvfs is 8 will return an error.
What: /sys/bus/pci/devices/.../driver_override
Date: April 2014
Contact: Alex Williamson <alex.williamson@redhat.com>
Description:
This file allows the driver for a device to be specified which
will override standard static and dynamic ID matching. When
specified, only a driver with a name matching the value written
to driver_override will have an opportunity to bind to the
device. The override is specified by writing a string to the
driver_override file (echo pci-stub > driver_override) and
may be cleared with an empty string (echo > driver_override).
This returns the device to standard matching rules binding.
Writing to driver_override does not automatically unbind the
device from its current driver or make any attempt to
automatically load the specified driver. If no driver with a
matching name is currently loaded in the kernel, the device
will not bind to any driver. This also allows devices to
opt-out of driver binding using a driver_override name such as
"none". Only a single driver may be specified in the override,
there is no support for parsing delimiters.

4
arch/ia64/pci/fixup.c
View File

@ -49,9 +49,7 @@ static void pci_fixup_video(struct pci_dev *pdev)
* type BRIDGE, or CARDBUS. Host to PCI controllers use
* PCI header type NORMAL.
*/
if (bridge
&&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
if (bridge && (pci_is_bridge(bridge))) {
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
&config);
if (!(config & PCI_BRIDGE_CTL_VGA))

3
arch/powerpc/kernel/pci-hotplug.c
View File

@ -98,8 +98,7 @@ void pcibios_add_pci_devices(struct pci_bus * bus)
max = bus->busn_res.start;
for (pass = 0; pass < 2; pass++) {
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (pci_is_bridge(dev))
max = pci_scan_bridge(bus, dev,
max, pass);
}

3
arch/powerpc/kernel/pci_of_scan.c
View File

@ -362,8 +362,7 @@ static void __of_scan_bus(struct device_node *node, struct pci_bus *bus,
/* Now scan child busses */
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
if (pci_is_bridge(dev)) {
of_scan_pci_bridge(dev);
}
}

3
arch/sparc/kernel/pci.c
View File

@ -543,8 +543,7 @@ static void pci_of_scan_bus(struct pci_pbm_info *pbm,
printk("PCI: dev header type: %x\n",
dev->hdr_type);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (pci_is_bridge(dev))
of_scan_pci_bridge(pbm, child, dev);
}
}

4
arch/x86/pci/fixup.c
View File

@ -338,9 +338,7 @@ static void pci_fixup_video(struct pci_dev *pdev)
* type BRIDGE, or CARDBUS. Host to PCI controllers use
* PCI header type NORMAL.
*/
if (bridge
&& ((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
|| (bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
if (bridge && (pci_is_bridge(bridge))) {
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
&config);
if (!(config & PCI_BRIDGE_CTL_VGA))

11
drivers/block/nvme-core.c
View File

@ -2775,6 +2775,16 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return result;
}
static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
{
struct nvme_dev *dev = pci_get_drvdata(pdev);
if (prepare)
nvme_dev_shutdown(dev);
else
nvme_dev_resume(dev);
}
static void nvme_shutdown(struct pci_dev *pdev)
{
struct nvme_dev *dev = pci_get_drvdata(pdev);
@ -2839,6 +2849,7 @@ static const struct pci_error_handlers nvme_err_handler = {
.link_reset = nvme_link_reset,
.slot_reset = nvme_slot_reset,
.resume = nvme_error_resume,
.reset_notify = nvme_reset_notify,
};
/* Move to pci_ids.h later */

3
drivers/pci/hotplug/acpiphp_glue.c
View File

@ -515,8 +515,7 @@ static void enable_slot(struct acpiphp_slot *slot)
if (PCI_SLOT(dev->devfn) != slot->device)
continue;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
if (pci_is_bridge(dev)) {
max = pci_scan_bridge(bus, dev, max, pass);
if (pass && dev->subordinate) {
check_hotplug_bridge(slot, dev);

3
drivers/pci/hotplug/cpci_hotplug_pci.c
View File

@ -289,8 +289,7 @@ int cpci_configure_slot(struct slot *slot)
list_for_each_entry(dev, &parent->devices, bus_list)
if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
continue;
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
if (pci_is_bridge(dev))
pci_hp_add_bridge(dev);

3
drivers/pci/hotplug/cpqphp_ctrl.c
View File

@ -709,7 +709,8 @@ static struct pci_resource *get_max_resource(struct pci_resource **head, u32 siz
temp = temp->next;
}
temp->next = max->next;
if (temp)
temp->next = max->next;
}
max->next = NULL;

3
drivers/pci/hotplug/pciehp_pci.c
View File

@ -62,8 +62,7 @@ int pciehp_configure_device(struct slot *p_slot)
}
list_for_each_entry(dev, &parent->devices, bus_list)
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
if (pci_is_bridge(dev))
pci_hp_add_bridge(dev);
pci_assign_unassigned_bridge_resources(bridge);

3
drivers/pci/hotplug/rpadlpar_core.c
View File

@ -157,8 +157,7 @@ static void dlpar_pci_add_bus(struct device_node *dn)
}
/* Scan below the new bridge */
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (pci_is_bridge(dev))
of_scan_pci_bridge(dev);
/* Map IO space for child bus, which may or may not succeed */

3
drivers/pci/hotplug/shpchp_pci.c
View File

@ -64,8 +64,7 @@ int shpchp_configure_device(struct slot *p_slot)
list_for_each_entry(dev, &parent->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != p_slot->device)
continue;
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
if (pci_is_bridge(dev))
pci_hp_add_bridge(dev);
}

8
drivers/pci/pci-acpi.c
View File

@ -309,13 +309,7 @@ static struct acpi_device *acpi_pci_find_companion(struct device *dev)
bool check_children;
u64 addr;
/*
* pci_is_bridge() is not suitable here, because pci_dev->subordinate
* is set only after acpi_pci_find_device() has been called for the
* given device.
*/
check_children = pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE
|| pci_dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
check_children = pci_is_bridge(pci_dev);
/* Please ref to ACPI spec for the syntax of _ADR */
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,

33
drivers/pci/pci-driver.c
View File

@ -236,6 +236,13 @@ const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
return NULL;
}
static const struct pci_device_id pci_device_id_any = {
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
};
/**
* pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
* @drv: the PCI driver to match against
@ -249,18 +256,30 @@ static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
struct pci_dev *dev)
{
struct pci_dynid *dynid;
const struct pci_device_id *found_id = NULL;
/* When driver_override is set, only bind to the matching driver */
if (dev->driver_override && strcmp(dev->driver_override, drv->name))
return NULL;
/* Look at the dynamic ids first, before the static ones */
spin_lock(&drv->dynids.lock);
list_for_each_entry(dynid, &drv->dynids.list, node) {
if (pci_match_one_device(&dynid->id, dev)) {
spin_unlock(&drv->dynids.lock);
return &dynid->id;
found_id = &dynid->id;
break;
}
}
spin_unlock(&drv->dynids.lock);
return pci_match_id(drv->id_table, dev);
if (!found_id)
found_id = pci_match_id(drv->id_table, dev);
/* driver_override will always match, send a dummy id */
if (!found_id && dev->driver_override)
found_id = &pci_device_id_any;
return found_id;
}
struct drv_dev_and_id {
@ -600,14 +619,14 @@ static void pci_pm_default_resume(struct pci_dev *pci_dev)
{
pci_fixup_device(pci_fixup_resume, pci_dev);
if (!pci_is_bridge(pci_dev))
if (!pci_has_subordinate(pci_dev))
pci_enable_wake(pci_dev, PCI_D0, false);
}
static void pci_pm_default_suspend(struct pci_dev *pci_dev)
{
/* Disable non-bridge devices without PM support */
if (!pci_is_bridge(pci_dev))
if (!pci_has_subordinate(pci_dev))
pci_disable_enabled_device(pci_dev);
}
@ -737,7 +756,7 @@ static int pci_pm_suspend_noirq(struct device *dev)
if (!pci_dev->state_saved) {
pci_save_state(pci_dev);
if (!pci_is_bridge(pci_dev))
if (!pci_has_subordinate(pci_dev))
pci_prepare_to_sleep(pci_dev);
}
@ -991,7 +1010,7 @@ static int pci_pm_poweroff_noirq(struct device *dev)
return error;
}
if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
pci_prepare_to_sleep(pci_dev);
/*

40
drivers/pci/pci-sysfs.c
View File

@ -514,6 +514,45 @@ static struct device_attribute sriov_numvfs_attr =
sriov_numvfs_show, sriov_numvfs_store);
#endif /* CONFIG_PCI_IOV */
static ssize_t driver_override_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
char *driver_override, *old = pdev->driver_override, *cp;
if (count > PATH_MAX)
return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);
if (!driver_override)
return -ENOMEM;
cp = strchr(driver_override, '\n');
if (cp)
*cp = '\0';
if (strlen(driver_override)) {
pdev->driver_override = driver_override;
} else {
kfree(driver_override);
pdev->driver_override = NULL;
}
kfree(old);
return count;
}
static ssize_t driver_override_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%s\n", pdev->driver_override);
}
static DEVICE_ATTR_RW(driver_override);
static struct attribute *pci_dev_attrs[] = {
&dev_attr_resource.attr,
&dev_attr_vendor.attr,
@ -539,6 +578,7 @@ static struct attribute *pci_dev_attrs[] = {
#ifdef CONFIG_OF
&dev_attr_devspec.attr,
#endif
&dev_attr_driver_override.attr,
NULL,
};

21
drivers/pci/pci.c
View File

@ -3305,8 +3305,27 @@ static void pci_dev_unlock(struct pci_dev *dev)
pci_cfg_access_unlock(dev);
}
/**
* pci_reset_notify - notify device driver of reset
* @dev: device to be notified of reset
* @prepare: 'true' if device is about to be reset; 'false' if reset attempt
* completed
*
* Must be called prior to device access being disabled and after device
* access is restored.
*/
static void pci_reset_notify(struct pci_dev *dev, bool prepare)
{
const struct pci_error_handlers *err_handler =
dev->driver ? dev->driver->err_handler : NULL;
if (err_handler && err_handler->reset_notify)
err_handler->reset_notify(dev, prepare);
}
static void pci_dev_save_and_disable(struct pci_dev *dev)
{
pci_reset_notify(dev, true);
/*
* Wake-up device prior to save. PM registers default to D0 after
* reset and a simple register restore doesn't reliably return
@ -3328,6 +3347,7 @@ static void pci_dev_save_and_disable(struct pci_dev *dev)
static void pci_dev_restore(struct pci_dev *dev)
{
pci_restore_state(dev);
pci_reset_notify(dev, false);
}
static int pci_dev_reset(struct pci_dev *dev, int probe)
@ -3344,6 +3364,7 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
return rc;
}
/**
* __pci_reset_function - reset a PCI device function
* @dev: PCI device to reset

2
drivers/pci/pci.h
View File

@ -77,7 +77,7 @@ static inline void pci_wakeup_event(struct pci_dev *dev)
pm_wakeup_event(&dev->dev, 100);
}
static inline bool pci_is_bridge(struct pci_dev *pci_dev)
static inline bool pci_has_subordinate(struct pci_dev *pci_dev)
{
return !!(pci_dev->subordinate);
}

4
drivers/pci/probe.c
View File

@ -1225,6 +1225,7 @@ static void pci_release_dev(struct device *dev)
pci_release_of_node(pci_dev);
pcibios_release_device(pci_dev);
pci_bus_put(pci_dev->bus);
kfree(pci_dev->driver_override);
kfree(pci_dev);
}
@ -1680,8 +1681,7 @@ unsigned int pci_scan_child_bus(struct pci_bus *bus)
for (pass=0; pass < 2; pass++)
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (pci_is_bridge(dev))
max = pci_scan_bridge(bus, dev, max, pass);
}

4
drivers/pci/setup-bus.c
View File

@ -1716,9 +1716,7 @@ void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
down_read(&pci_bus_sem);
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (dev->subordinate)
if (pci_is_bridge(dev) && pci_has_subordinate(dev))
__pci_bus_size_bridges(dev->subordinate,
&add_list);
up_read(&pci_bus_sem);

3
drivers/pcmcia/cardbus.c
View File

@ -78,8 +78,7 @@ int __ref cb_alloc(struct pcmcia_socket *s)
max = bus->busn_res.start;
for (pass = 0; pass < 2; pass++)
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (pci_is_bridge(dev))
max = pci_scan_bridge(bus, dev, max, pass);
/*

17
include/linux/pci.h
View File

@ -365,6 +365,7 @@ struct pci_dev {
#endif
phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */
size_t romlen; /* Length of ROM if it's not from the BAR */
char *driver_override; /* Driver name to force a match */
};
static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
@ -477,6 +478,19 @@ static inline bool pci_is_root_bus(struct pci_bus *pbus)
return !(pbus->parent);
}
/**
* pci_is_bridge - check if the PCI device is a bridge
* @dev: PCI device
*
* Return true if the PCI device is bridge whether it has subordinate
* or not.
*/
static inline bool pci_is_bridge(struct pci_dev *dev)
{
return dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
}
static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
{
dev = pci_physfn(dev);
@ -603,6 +617,9 @@ struct pci_error_handlers {
/* PCI slot has been reset */
pci_ers_result_t (*slot_reset)(struct pci_dev *dev);
/* PCI function reset prepare or completed */
void (*reset_notify)(struct pci_dev *dev, bool prepare);
/* Device driver may resume normal operations */
void (*resume)(struct pci_dev *dev);
};