![Jia-Ju Bai](/assets/img/avatar_default.png)
pcistub_reg_add() is never called in atomic context. pcistub_reg_add() is only called by pcistub_quirk_add, which is only set in DRIVER_ATTR(). Despite never getting called from atomic context, pcistub_reg_add() calls kzalloc() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
1652 lines
40 KiB
C
1652 lines
40 KiB
C
/*
|
|
* PCI Stub Driver - Grabs devices in backend to be exported later
|
|
*
|
|
* Ryan Wilson <hap9@epoch.ncsc.mil>
|
|
* Chris Bookholt <hap10@epoch.ncsc.mil>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/atomic.h>
|
|
#include <xen/events.h>
|
|
#include <asm/xen/pci.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/interface/physdev.h>
|
|
#include "pciback.h"
|
|
#include "conf_space.h"
|
|
#include "conf_space_quirks.h"
|
|
|
|
#define PCISTUB_DRIVER_NAME "pciback"
|
|
|
|
static char *pci_devs_to_hide;
|
|
wait_queue_head_t xen_pcibk_aer_wait_queue;
|
|
/*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
|
|
* We want to avoid in middle of AER ops, xen_pcibk devices is being removed
|
|
*/
|
|
static DECLARE_RWSEM(pcistub_sem);
|
|
module_param_named(hide, pci_devs_to_hide, charp, 0444);
|
|
|
|
struct pcistub_device_id {
|
|
struct list_head slot_list;
|
|
int domain;
|
|
unsigned char bus;
|
|
unsigned int devfn;
|
|
};
|
|
static LIST_HEAD(pcistub_device_ids);
|
|
static DEFINE_SPINLOCK(device_ids_lock);
|
|
|
|
struct pcistub_device {
|
|
struct kref kref;
|
|
struct list_head dev_list;
|
|
spinlock_t lock;
|
|
|
|
struct pci_dev *dev;
|
|
struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
|
|
};
|
|
|
|
/* Access to pcistub_devices & seized_devices lists and the initialize_devices
|
|
* flag must be locked with pcistub_devices_lock
|
|
*/
|
|
static DEFINE_SPINLOCK(pcistub_devices_lock);
|
|
static LIST_HEAD(pcistub_devices);
|
|
|
|
/* wait for device_initcall before initializing our devices
|
|
* (see pcistub_init_devices_late)
|
|
*/
|
|
static int initialize_devices;
|
|
static LIST_HEAD(seized_devices);
|
|
|
|
static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
|
|
dev_dbg(&dev->dev, "pcistub_device_alloc\n");
|
|
|
|
psdev = kzalloc(sizeof(*psdev), GFP_KERNEL);
|
|
if (!psdev)
|
|
return NULL;
|
|
|
|
psdev->dev = pci_dev_get(dev);
|
|
if (!psdev->dev) {
|
|
kfree(psdev);
|
|
return NULL;
|
|
}
|
|
|
|
kref_init(&psdev->kref);
|
|
spin_lock_init(&psdev->lock);
|
|
|
|
return psdev;
|
|
}
|
|
|
|
/* Don't call this directly as it's called by pcistub_device_put */
|
|
static void pcistub_device_release(struct kref *kref)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct pci_dev *dev;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
|
|
psdev = container_of(kref, struct pcistub_device, kref);
|
|
dev = psdev->dev;
|
|
dev_data = pci_get_drvdata(dev);
|
|
|
|
dev_dbg(&dev->dev, "pcistub_device_release\n");
|
|
|
|
xen_unregister_device_domain_owner(dev);
|
|
|
|
/* Call the reset function which does not take lock as this
|
|
* is called from "unbind" which takes a device_lock mutex.
|
|
*/
|
|
__pci_reset_function_locked(dev);
|
|
if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
|
|
dev_info(&dev->dev, "Could not reload PCI state\n");
|
|
else
|
|
pci_restore_state(dev);
|
|
|
|
if (dev->msix_cap) {
|
|
struct physdev_pci_device ppdev = {
|
|
.seg = pci_domain_nr(dev->bus),
|
|
.bus = dev->bus->number,
|
|
.devfn = dev->devfn
|
|
};
|
|
int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
|
|
&ppdev);
|
|
|
|
if (err && err != -ENOSYS)
|
|
dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
|
|
err);
|
|
}
|
|
|
|
/* Disable the device */
|
|
xen_pcibk_reset_device(dev);
|
|
|
|
kfree(dev_data);
|
|
pci_set_drvdata(dev, NULL);
|
|
|
|
/* Clean-up the device */
|
|
xen_pcibk_config_free_dyn_fields(dev);
|
|
xen_pcibk_config_free_dev(dev);
|
|
|
|
pci_clear_dev_assigned(dev);
|
|
pci_dev_put(dev);
|
|
|
|
kfree(psdev);
|
|
}
|
|
|
|
static inline void pcistub_device_get(struct pcistub_device *psdev)
|
|
{
|
|
kref_get(&psdev->kref);
|
|
}
|
|
|
|
static inline void pcistub_device_put(struct pcistub_device *psdev)
|
|
{
|
|
kref_put(&psdev->kref, pcistub_device_release);
|
|
}
|
|
|
|
static struct pcistub_device *pcistub_device_find_locked(int domain, int bus,
|
|
int slot, int func)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (psdev->dev != NULL
|
|
&& domain == pci_domain_nr(psdev->dev->bus)
|
|
&& bus == psdev->dev->bus->number
|
|
&& slot == PCI_SLOT(psdev->dev->devfn)
|
|
&& func == PCI_FUNC(psdev->dev->devfn)) {
|
|
return psdev;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct pcistub_device *pcistub_device_find(int domain, int bus,
|
|
int slot, int func)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
psdev = pcistub_device_find_locked(domain, bus, slot, func);
|
|
if (psdev)
|
|
pcistub_device_get(psdev);
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
return psdev;
|
|
}
|
|
|
|
static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
|
|
struct pcistub_device *psdev)
|
|
{
|
|
struct pci_dev *pci_dev = NULL;
|
|
unsigned long flags;
|
|
|
|
pcistub_device_get(psdev);
|
|
|
|
spin_lock_irqsave(&psdev->lock, flags);
|
|
if (!psdev->pdev) {
|
|
psdev->pdev = pdev;
|
|
pci_dev = psdev->dev;
|
|
}
|
|
spin_unlock_irqrestore(&psdev->lock, flags);
|
|
|
|
if (!pci_dev)
|
|
pcistub_device_put(psdev);
|
|
|
|
return pci_dev;
|
|
}
|
|
|
|
struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
|
|
int domain, int bus,
|
|
int slot, int func)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct pci_dev *found_dev = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
psdev = pcistub_device_find_locked(domain, bus, slot, func);
|
|
if (psdev)
|
|
found_dev = pcistub_device_get_pci_dev(pdev, psdev);
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
return found_dev;
|
|
}
|
|
|
|
struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
|
|
struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct pci_dev *found_dev = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (psdev->dev == dev) {
|
|
found_dev = pcistub_device_get_pci_dev(pdev, psdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
return found_dev;
|
|
}
|
|
|
|
/*
|
|
* Called when:
|
|
* - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device
|
|
* - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove
|
|
* - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove
|
|
* - 'echo BDF > unbind' with a guest still using it. See pcistub_remove
|
|
*
|
|
* As such we have to be careful.
|
|
*
|
|
* To make this easier, the caller has to hold the device lock.
|
|
*/
|
|
void pcistub_put_pci_dev(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev, *found_psdev = NULL;
|
|
unsigned long flags;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (psdev->dev == dev) {
|
|
found_psdev = psdev;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
if (WARN_ON(!found_psdev))
|
|
return;
|
|
|
|
/*hold this lock for avoiding breaking link between
|
|
* pcistub and xen_pcibk when AER is in processing
|
|
*/
|
|
down_write(&pcistub_sem);
|
|
/* Cleanup our device
|
|
* (so it's ready for the next domain)
|
|
*/
|
|
device_lock_assert(&dev->dev);
|
|
__pci_reset_function_locked(dev);
|
|
|
|
dev_data = pci_get_drvdata(dev);
|
|
ret = pci_load_saved_state(dev, dev_data->pci_saved_state);
|
|
if (!ret) {
|
|
/*
|
|
* The usual sequence is pci_save_state & pci_restore_state
|
|
* but the guest might have messed the configuration space up.
|
|
* Use the initial version (when device was bound to us).
|
|
*/
|
|
pci_restore_state(dev);
|
|
} else
|
|
dev_info(&dev->dev, "Could not reload PCI state\n");
|
|
/* This disables the device. */
|
|
xen_pcibk_reset_device(dev);
|
|
|
|
/* And cleanup up our emulated fields. */
|
|
xen_pcibk_config_reset_dev(dev);
|
|
xen_pcibk_config_free_dyn_fields(dev);
|
|
|
|
xen_unregister_device_domain_owner(dev);
|
|
|
|
spin_lock_irqsave(&found_psdev->lock, flags);
|
|
found_psdev->pdev = NULL;
|
|
spin_unlock_irqrestore(&found_psdev->lock, flags);
|
|
|
|
pcistub_device_put(found_psdev);
|
|
up_write(&pcistub_sem);
|
|
}
|
|
|
|
static int pcistub_match_one(struct pci_dev *dev,
|
|
struct pcistub_device_id *pdev_id)
|
|
{
|
|
/* Match the specified device by domain, bus, slot, func and also if
|
|
* any of the device's parent bridges match.
|
|
*/
|
|
for (; dev != NULL; dev = dev->bus->self) {
|
|
if (pci_domain_nr(dev->bus) == pdev_id->domain
|
|
&& dev->bus->number == pdev_id->bus
|
|
&& dev->devfn == pdev_id->devfn)
|
|
return 1;
|
|
|
|
/* Sometimes topmost bridge links to itself. */
|
|
if (dev == dev->bus->self)
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcistub_match(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device_id *pdev_id;
|
|
unsigned long flags;
|
|
int found = 0;
|
|
|
|
spin_lock_irqsave(&device_ids_lock, flags);
|
|
list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
|
|
if (pcistub_match_one(dev, pdev_id)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&device_ids_lock, flags);
|
|
|
|
return found;
|
|
}
|
|
|
|
static int pcistub_init_device(struct pci_dev *dev)
|
|
{
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
int err = 0;
|
|
|
|
dev_dbg(&dev->dev, "initializing...\n");
|
|
|
|
/* The PCI backend is not intended to be a module (or to work with
|
|
* removable PCI devices (yet). If it were, xen_pcibk_config_free()
|
|
* would need to be called somewhere to free the memory allocated
|
|
* here and then to call kfree(pci_get_drvdata(psdev->dev)).
|
|
*/
|
|
dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
|
|
+ strlen(pci_name(dev)) + 1, GFP_KERNEL);
|
|
if (!dev_data) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pci_set_drvdata(dev, dev_data);
|
|
|
|
/*
|
|
* Setup name for fake IRQ handler. It will only be enabled
|
|
* once the device is turned on by the guest.
|
|
*/
|
|
sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
|
|
|
|
dev_dbg(&dev->dev, "initializing config\n");
|
|
|
|
init_waitqueue_head(&xen_pcibk_aer_wait_queue);
|
|
err = xen_pcibk_config_init_dev(dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* HACK: Force device (& ACPI) to determine what IRQ it's on - we
|
|
* must do this here because pcibios_enable_device may specify
|
|
* the pci device's true irq (and possibly its other resources)
|
|
* if they differ from what's in the configuration space.
|
|
* This makes the assumption that the device's resources won't
|
|
* change after this point (otherwise this code may break!)
|
|
*/
|
|
dev_dbg(&dev->dev, "enabling device\n");
|
|
err = pci_enable_device(dev);
|
|
if (err)
|
|
goto config_release;
|
|
|
|
if (dev->msix_cap) {
|
|
struct physdev_pci_device ppdev = {
|
|
.seg = pci_domain_nr(dev->bus),
|
|
.bus = dev->bus->number,
|
|
.devfn = dev->devfn
|
|
};
|
|
|
|
err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
|
|
if (err && err != -ENOSYS)
|
|
dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
|
|
err);
|
|
}
|
|
|
|
/* We need the device active to save the state. */
|
|
dev_dbg(&dev->dev, "save state of device\n");
|
|
pci_save_state(dev);
|
|
dev_data->pci_saved_state = pci_store_saved_state(dev);
|
|
if (!dev_data->pci_saved_state)
|
|
dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
|
|
else {
|
|
dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n");
|
|
__pci_reset_function_locked(dev);
|
|
pci_restore_state(dev);
|
|
}
|
|
/* Now disable the device (this also ensures some private device
|
|
* data is setup before we export)
|
|
*/
|
|
dev_dbg(&dev->dev, "reset device\n");
|
|
xen_pcibk_reset_device(dev);
|
|
|
|
pci_set_dev_assigned(dev);
|
|
return 0;
|
|
|
|
config_release:
|
|
xen_pcibk_config_free_dev(dev);
|
|
|
|
out:
|
|
pci_set_drvdata(dev, NULL);
|
|
kfree(dev_data);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Because some initialization still happens on
|
|
* devices during fs_initcall, we need to defer
|
|
* full initialization of our devices until
|
|
* device_initcall.
|
|
*/
|
|
static int __init pcistub_init_devices_late(void)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
while (!list_empty(&seized_devices)) {
|
|
psdev = container_of(seized_devices.next,
|
|
struct pcistub_device, dev_list);
|
|
list_del(&psdev->dev_list);
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
err = pcistub_init_device(psdev->dev);
|
|
if (err) {
|
|
dev_err(&psdev->dev->dev,
|
|
"error %d initializing device\n", err);
|
|
kfree(psdev);
|
|
psdev = NULL;
|
|
}
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
if (psdev)
|
|
list_add_tail(&psdev->dev_list, &pcistub_devices);
|
|
}
|
|
|
|
initialize_devices = 1;
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pcistub_device_id_add_list(struct pcistub_device_id *new,
|
|
int domain, int bus, unsigned int devfn)
|
|
{
|
|
struct pcistub_device_id *pci_dev_id;
|
|
unsigned long flags;
|
|
int found = 0;
|
|
|
|
spin_lock_irqsave(&device_ids_lock, flags);
|
|
|
|
list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
|
|
if (pci_dev_id->domain == domain && pci_dev_id->bus == bus &&
|
|
pci_dev_id->devfn == devfn) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
new->domain = domain;
|
|
new->bus = bus;
|
|
new->devfn = devfn;
|
|
list_add_tail(&new->slot_list, &pcistub_device_ids);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&device_ids_lock, flags);
|
|
|
|
if (found)
|
|
kfree(new);
|
|
}
|
|
|
|
static int pcistub_seize(struct pci_dev *dev,
|
|
struct pcistub_device_id *pci_dev_id)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
|
|
psdev = pcistub_device_alloc(dev);
|
|
if (!psdev) {
|
|
kfree(pci_dev_id);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
if (initialize_devices) {
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
/* don't want irqs disabled when calling pcistub_init_device */
|
|
err = pcistub_init_device(psdev->dev);
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
if (!err)
|
|
list_add(&psdev->dev_list, &pcistub_devices);
|
|
} else {
|
|
dev_dbg(&dev->dev, "deferring initialization\n");
|
|
list_add(&psdev->dev_list, &seized_devices);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
if (err) {
|
|
kfree(pci_dev_id);
|
|
pcistub_device_put(psdev);
|
|
} else if (pci_dev_id)
|
|
pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
|
|
dev->bus->number, dev->devfn);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
|
|
* other functions that take the sysfs lock. */
|
|
static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
|
|
{
|
|
int err = 0, match;
|
|
struct pcistub_device_id *pci_dev_id = NULL;
|
|
|
|
dev_dbg(&dev->dev, "probing...\n");
|
|
|
|
match = pcistub_match(dev);
|
|
|
|
if ((dev->driver_override &&
|
|
!strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
|
|
match) {
|
|
|
|
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
|
|
&& dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
|
|
dev_err(&dev->dev, "can't export pci devices that "
|
|
"don't have a normal (0) or bridge (1) "
|
|
"header type!\n");
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (!match) {
|
|
pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
|
|
if (!pci_dev_id) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
dev_info(&dev->dev, "seizing device\n");
|
|
err = pcistub_seize(dev, pci_dev_id);
|
|
} else
|
|
/* Didn't find the device */
|
|
err = -ENODEV;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
|
|
* other functions that take the sysfs lock. */
|
|
static void pcistub_remove(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev, *found_psdev = NULL;
|
|
unsigned long flags;
|
|
|
|
dev_dbg(&dev->dev, "removing\n");
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
|
|
xen_pcibk_config_quirk_release(dev);
|
|
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (psdev->dev == dev) {
|
|
found_psdev = psdev;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
if (found_psdev) {
|
|
dev_dbg(&dev->dev, "found device to remove %s\n",
|
|
found_psdev->pdev ? "- in-use" : "");
|
|
|
|
if (found_psdev->pdev) {
|
|
int domid = xen_find_device_domain_owner(dev);
|
|
|
|
pr_warn("****** removing device %s while still in-use by domain %d! ******\n",
|
|
pci_name(found_psdev->dev), domid);
|
|
pr_warn("****** driver domain may still access this device's i/o resources!\n");
|
|
pr_warn("****** shutdown driver domain before binding device\n");
|
|
pr_warn("****** to other drivers or domains\n");
|
|
|
|
/* N.B. This ends up calling pcistub_put_pci_dev which ends up
|
|
* doing the FLR. */
|
|
xen_pcibk_release_pci_dev(found_psdev->pdev,
|
|
found_psdev->dev,
|
|
false /* caller holds the lock. */);
|
|
}
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
list_del(&found_psdev->dev_list);
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
|
|
/* the final put for releasing from the list */
|
|
pcistub_device_put(found_psdev);
|
|
}
|
|
}
|
|
|
|
static const struct pci_device_id pcistub_ids[] = {
|
|
{
|
|
.vendor = PCI_ANY_ID,
|
|
.device = PCI_ANY_ID,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
},
|
|
{0,},
|
|
};
|
|
|
|
#define PCI_NODENAME_MAX 40
|
|
static void kill_domain_by_device(struct pcistub_device *psdev)
|
|
{
|
|
struct xenbus_transaction xbt;
|
|
int err;
|
|
char nodename[PCI_NODENAME_MAX];
|
|
|
|
BUG_ON(!psdev);
|
|
snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
|
|
psdev->pdev->xdev->otherend_id);
|
|
|
|
again:
|
|
err = xenbus_transaction_start(&xbt);
|
|
if (err) {
|
|
dev_err(&psdev->dev->dev,
|
|
"error %d when start xenbus transaction\n", err);
|
|
return;
|
|
}
|
|
/*PV AER handlers will set this flag*/
|
|
xenbus_printf(xbt, nodename, "aerState" , "aerfail");
|
|
err = xenbus_transaction_end(xbt, 0);
|
|
if (err) {
|
|
if (err == -EAGAIN)
|
|
goto again;
|
|
dev_err(&psdev->dev->dev,
|
|
"error %d when end xenbus transaction\n", err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
|
|
* backend need to have cooperation. In xen_pcibk, those steps will do similar
|
|
* jobs: send service request and waiting for front_end response.
|
|
*/
|
|
static pci_ers_result_t common_process(struct pcistub_device *psdev,
|
|
pci_channel_state_t state, int aer_cmd,
|
|
pci_ers_result_t result)
|
|
{
|
|
pci_ers_result_t res = result;
|
|
struct xen_pcie_aer_op *aer_op;
|
|
struct xen_pcibk_device *pdev = psdev->pdev;
|
|
struct xen_pci_sharedinfo *sh_info = pdev->sh_info;
|
|
int ret;
|
|
|
|
/*with PV AER drivers*/
|
|
aer_op = &(sh_info->aer_op);
|
|
aer_op->cmd = aer_cmd ;
|
|
/*useful for error_detected callback*/
|
|
aer_op->err = state;
|
|
/*pcifront_end BDF*/
|
|
ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
|
|
&aer_op->domain, &aer_op->bus, &aer_op->devfn);
|
|
if (!ret) {
|
|
dev_err(&psdev->dev->dev,
|
|
DRV_NAME ": failed to get pcifront device\n");
|
|
return PCI_ERS_RESULT_NONE;
|
|
}
|
|
wmb();
|
|
|
|
dev_dbg(&psdev->dev->dev,
|
|
DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
|
|
aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
|
|
/*local flag to mark there's aer request, xen_pcibk callback will use
|
|
* this flag to judge whether we need to check pci-front give aer
|
|
* service ack signal
|
|
*/
|
|
set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
|
|
|
|
/*It is possible that a pcifront conf_read_write ops request invokes
|
|
* the callback which cause the spurious execution of wake_up.
|
|
* Yet it is harmless and better than a spinlock here
|
|
*/
|
|
set_bit(_XEN_PCIB_active,
|
|
(unsigned long *)&sh_info->flags);
|
|
wmb();
|
|
notify_remote_via_irq(pdev->evtchn_irq);
|
|
|
|
ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
|
|
!(test_bit(_XEN_PCIB_active, (unsigned long *)
|
|
&sh_info->flags)), 300*HZ);
|
|
|
|
if (!ret) {
|
|
if (test_bit(_XEN_PCIB_active,
|
|
(unsigned long *)&sh_info->flags)) {
|
|
dev_err(&psdev->dev->dev,
|
|
"pcifront aer process not responding!\n");
|
|
clear_bit(_XEN_PCIB_active,
|
|
(unsigned long *)&sh_info->flags);
|
|
aer_op->err = PCI_ERS_RESULT_NONE;
|
|
return res;
|
|
}
|
|
}
|
|
clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
|
|
|
|
if (test_bit(_XEN_PCIF_active,
|
|
(unsigned long *)&sh_info->flags)) {
|
|
dev_dbg(&psdev->dev->dev,
|
|
"schedule pci_conf service in " DRV_NAME "\n");
|
|
xen_pcibk_test_and_schedule_op(psdev->pdev);
|
|
}
|
|
|
|
res = (pci_ers_result_t)aer_op->err;
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
|
|
* of the device driver could provide this service, and then wait for pcifront
|
|
* ack.
|
|
* @dev: pointer to PCI devices
|
|
* return value is used by aer_core do_recovery policy
|
|
*/
|
|
static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
pci_ers_result_t result;
|
|
|
|
result = PCI_ERS_RESULT_RECOVERED;
|
|
dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
|
|
dev->bus->number, dev->devfn);
|
|
|
|
down_write(&pcistub_sem);
|
|
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
|
|
dev->bus->number,
|
|
PCI_SLOT(dev->devfn),
|
|
PCI_FUNC(dev->devfn));
|
|
|
|
if (!psdev || !psdev->pdev) {
|
|
dev_err(&dev->dev,
|
|
DRV_NAME " device is not found/assigned\n");
|
|
goto end;
|
|
}
|
|
|
|
if (!psdev->pdev->sh_info) {
|
|
dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
|
|
" by HVM, kill it\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
|
|
if (!test_bit(_XEN_PCIB_AERHANDLER,
|
|
(unsigned long *)&psdev->pdev->sh_info->flags)) {
|
|
dev_err(&dev->dev,
|
|
"guest with no AER driver should have been killed\n");
|
|
goto end;
|
|
}
|
|
result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
|
|
|
|
if (result == PCI_ERS_RESULT_NONE ||
|
|
result == PCI_ERS_RESULT_DISCONNECT) {
|
|
dev_dbg(&dev->dev,
|
|
"No AER slot_reset service or disconnected!\n");
|
|
kill_domain_by_device(psdev);
|
|
}
|
|
end:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
up_write(&pcistub_sem);
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
/*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
|
|
* in case of the device driver could provide this service, and then wait
|
|
* for pcifront ack
|
|
* @dev: pointer to PCI devices
|
|
* return value is used by aer_core do_recovery policy
|
|
*/
|
|
|
|
static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
pci_ers_result_t result;
|
|
|
|
result = PCI_ERS_RESULT_RECOVERED;
|
|
dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
|
|
dev->bus->number, dev->devfn);
|
|
|
|
down_write(&pcistub_sem);
|
|
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
|
|
dev->bus->number,
|
|
PCI_SLOT(dev->devfn),
|
|
PCI_FUNC(dev->devfn));
|
|
|
|
if (!psdev || !psdev->pdev) {
|
|
dev_err(&dev->dev,
|
|
DRV_NAME " device is not found/assigned\n");
|
|
goto end;
|
|
}
|
|
|
|
if (!psdev->pdev->sh_info) {
|
|
dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
|
|
" by HVM, kill it\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
|
|
if (!test_bit(_XEN_PCIB_AERHANDLER,
|
|
(unsigned long *)&psdev->pdev->sh_info->flags)) {
|
|
dev_err(&dev->dev,
|
|
"guest with no AER driver should have been killed\n");
|
|
goto end;
|
|
}
|
|
result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
|
|
|
|
if (result == PCI_ERS_RESULT_NONE ||
|
|
result == PCI_ERS_RESULT_DISCONNECT) {
|
|
dev_dbg(&dev->dev,
|
|
"No AER mmio_enabled service or disconnected!\n");
|
|
kill_domain_by_device(psdev);
|
|
}
|
|
end:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
up_write(&pcistub_sem);
|
|
return result;
|
|
}
|
|
|
|
/*xen_pcibk_error_detected: it will send the error_detected request to pcifront
|
|
* in case of the device driver could provide this service, and then wait
|
|
* for pcifront ack.
|
|
* @dev: pointer to PCI devices
|
|
* @error: the current PCI connection state
|
|
* return value is used by aer_core do_recovery policy
|
|
*/
|
|
|
|
static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
|
|
pci_channel_state_t error)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
pci_ers_result_t result;
|
|
|
|
result = PCI_ERS_RESULT_CAN_RECOVER;
|
|
dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
|
|
dev->bus->number, dev->devfn);
|
|
|
|
down_write(&pcistub_sem);
|
|
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
|
|
dev->bus->number,
|
|
PCI_SLOT(dev->devfn),
|
|
PCI_FUNC(dev->devfn));
|
|
|
|
if (!psdev || !psdev->pdev) {
|
|
dev_err(&dev->dev,
|
|
DRV_NAME " device is not found/assigned\n");
|
|
goto end;
|
|
}
|
|
|
|
if (!psdev->pdev->sh_info) {
|
|
dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
|
|
" by HVM, kill it\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
|
|
/*Guest owns the device yet no aer handler regiested, kill guest*/
|
|
if (!test_bit(_XEN_PCIB_AERHANDLER,
|
|
(unsigned long *)&psdev->pdev->sh_info->flags)) {
|
|
dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
|
|
|
|
if (result == PCI_ERS_RESULT_NONE ||
|
|
result == PCI_ERS_RESULT_DISCONNECT) {
|
|
dev_dbg(&dev->dev,
|
|
"No AER error_detected service or disconnected!\n");
|
|
kill_domain_by_device(psdev);
|
|
}
|
|
end:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
up_write(&pcistub_sem);
|
|
return result;
|
|
}
|
|
|
|
/*xen_pcibk_error_resume: it will send the error_resume request to pcifront
|
|
* in case of the device driver could provide this service, and then wait
|
|
* for pcifront ack.
|
|
* @dev: pointer to PCI devices
|
|
*/
|
|
|
|
static void xen_pcibk_error_resume(struct pci_dev *dev)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
|
|
dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
|
|
dev->bus->number, dev->devfn);
|
|
|
|
down_write(&pcistub_sem);
|
|
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
|
|
dev->bus->number,
|
|
PCI_SLOT(dev->devfn),
|
|
PCI_FUNC(dev->devfn));
|
|
|
|
if (!psdev || !psdev->pdev) {
|
|
dev_err(&dev->dev,
|
|
DRV_NAME " device is not found/assigned\n");
|
|
goto end;
|
|
}
|
|
|
|
if (!psdev->pdev->sh_info) {
|
|
dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
|
|
" by HVM, kill it\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
|
|
if (!test_bit(_XEN_PCIB_AERHANDLER,
|
|
(unsigned long *)&psdev->pdev->sh_info->flags)) {
|
|
dev_err(&dev->dev,
|
|
"guest with no AER driver should have been killed\n");
|
|
kill_domain_by_device(psdev);
|
|
goto end;
|
|
}
|
|
common_process(psdev, 1, XEN_PCI_OP_aer_resume,
|
|
PCI_ERS_RESULT_RECOVERED);
|
|
end:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
up_write(&pcistub_sem);
|
|
return;
|
|
}
|
|
|
|
/*add xen_pcibk AER handling*/
|
|
static const struct pci_error_handlers xen_pcibk_error_handler = {
|
|
.error_detected = xen_pcibk_error_detected,
|
|
.mmio_enabled = xen_pcibk_mmio_enabled,
|
|
.slot_reset = xen_pcibk_slot_reset,
|
|
.resume = xen_pcibk_error_resume,
|
|
};
|
|
|
|
/*
|
|
* Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
|
|
* for a normal device. I don't want it to be loaded automatically.
|
|
*/
|
|
|
|
static struct pci_driver xen_pcibk_pci_driver = {
|
|
/* The name should be xen_pciback, but until the tools are updated
|
|
* we will keep it as pciback. */
|
|
.name = PCISTUB_DRIVER_NAME,
|
|
.id_table = pcistub_ids,
|
|
.probe = pcistub_probe,
|
|
.remove = pcistub_remove,
|
|
.err_handler = &xen_pcibk_error_handler,
|
|
};
|
|
|
|
static inline int str_to_slot(const char *buf, int *domain, int *bus,
|
|
int *slot, int *func)
|
|
{
|
|
int parsed = 0;
|
|
|
|
switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func,
|
|
&parsed)) {
|
|
case 3:
|
|
*func = -1;
|
|
sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed);
|
|
break;
|
|
case 2:
|
|
*slot = *func = -1;
|
|
sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed);
|
|
break;
|
|
}
|
|
if (parsed && !buf[parsed])
|
|
return 0;
|
|
|
|
/* try again without domain */
|
|
*domain = 0;
|
|
switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) {
|
|
case 2:
|
|
*func = -1;
|
|
sscanf(buf, " %x:%x.* %n", bus, slot, &parsed);
|
|
break;
|
|
case 1:
|
|
*slot = *func = -1;
|
|
sscanf(buf, " %x:*.* %n", bus, &parsed);
|
|
break;
|
|
}
|
|
if (parsed && !buf[parsed])
|
|
return 0;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
|
|
*slot, int *func, int *reg, int *size, int *mask)
|
|
{
|
|
int parsed = 0;
|
|
|
|
sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func,
|
|
reg, size, mask, &parsed);
|
|
if (parsed && !buf[parsed])
|
|
return 0;
|
|
|
|
/* try again without domain */
|
|
*domain = 0;
|
|
sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size,
|
|
mask, &parsed);
|
|
if (parsed && !buf[parsed])
|
|
return 0;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int pcistub_device_id_add(int domain, int bus, int slot, int func)
|
|
{
|
|
struct pcistub_device_id *pci_dev_id;
|
|
int rc = 0, devfn = PCI_DEVFN(slot, func);
|
|
|
|
if (slot < 0) {
|
|
for (slot = 0; !rc && slot < 32; ++slot)
|
|
rc = pcistub_device_id_add(domain, bus, slot, func);
|
|
return rc;
|
|
}
|
|
|
|
if (func < 0) {
|
|
for (func = 0; !rc && func < 8; ++func)
|
|
rc = pcistub_device_id_add(domain, bus, slot, func);
|
|
return rc;
|
|
}
|
|
|
|
if ((
|
|
#if !defined(MODULE) /* pci_domains_supported is not being exported */ \
|
|
|| !defined(CONFIG_PCI_DOMAINS)
|
|
!pci_domains_supported ? domain :
|
|
#endif
|
|
domain < 0 || domain > 0xffff)
|
|
|| bus < 0 || bus > 0xff
|
|
|| PCI_SLOT(devfn) != slot
|
|
|| PCI_FUNC(devfn) != func)
|
|
return -EINVAL;
|
|
|
|
pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
|
|
if (!pci_dev_id)
|
|
return -ENOMEM;
|
|
|
|
pr_debug("wants to seize %04x:%02x:%02x.%d\n",
|
|
domain, bus, slot, func);
|
|
|
|
pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
|
|
{
|
|
struct pcistub_device_id *pci_dev_id, *t;
|
|
int err = -ENOENT;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&device_ids_lock, flags);
|
|
list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
|
|
slot_list) {
|
|
if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
|
|
&& (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
|
|
&& (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
|
|
/* Don't break; here because it's possible the same
|
|
* slot could be in the list more than once
|
|
*/
|
|
list_del(&pci_dev_id->slot_list);
|
|
kfree(pci_dev_id);
|
|
|
|
err = 0;
|
|
|
|
pr_debug("removed %04x:%02x:%02x.%d from seize list\n",
|
|
domain, bus, slot, func);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&device_ids_lock, flags);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pcistub_reg_add(int domain, int bus, int slot, int func,
|
|
unsigned int reg, unsigned int size,
|
|
unsigned int mask)
|
|
{
|
|
int err = 0;
|
|
struct pcistub_device *psdev;
|
|
struct pci_dev *dev;
|
|
struct config_field *field;
|
|
|
|
if (reg > 0xfff || (size < 4 && (mask >> (size * 8))))
|
|
return -EINVAL;
|
|
|
|
psdev = pcistub_device_find(domain, bus, slot, func);
|
|
if (!psdev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
dev = psdev->dev;
|
|
|
|
field = kzalloc(sizeof(*field), GFP_KERNEL);
|
|
if (!field) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
field->offset = reg;
|
|
field->size = size;
|
|
field->mask = mask;
|
|
field->init = NULL;
|
|
field->reset = NULL;
|
|
field->release = NULL;
|
|
field->clean = xen_pcibk_config_field_free;
|
|
|
|
err = xen_pcibk_config_quirks_add_field(dev, field);
|
|
if (err)
|
|
kfree(field);
|
|
out:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
return err;
|
|
}
|
|
|
|
static ssize_t new_slot_store(struct device_driver *drv, const char *buf,
|
|
size_t count)
|
|
{
|
|
int domain, bus, slot, func;
|
|
int err;
|
|
|
|
err = str_to_slot(buf, &domain, &bus, &slot, &func);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = pcistub_device_id_add(domain, bus, slot, func);
|
|
|
|
out:
|
|
if (!err)
|
|
err = count;
|
|
return err;
|
|
}
|
|
static DRIVER_ATTR_WO(new_slot);
|
|
|
|
static ssize_t remove_slot_store(struct device_driver *drv, const char *buf,
|
|
size_t count)
|
|
{
|
|
int domain, bus, slot, func;
|
|
int err;
|
|
|
|
err = str_to_slot(buf, &domain, &bus, &slot, &func);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = pcistub_device_id_remove(domain, bus, slot, func);
|
|
|
|
out:
|
|
if (!err)
|
|
err = count;
|
|
return err;
|
|
}
|
|
static DRIVER_ATTR_WO(remove_slot);
|
|
|
|
static ssize_t slots_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct pcistub_device_id *pci_dev_id;
|
|
size_t count = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&device_ids_lock, flags);
|
|
list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
|
|
if (count >= PAGE_SIZE)
|
|
break;
|
|
|
|
count += scnprintf(buf + count, PAGE_SIZE - count,
|
|
"%04x:%02x:%02x.%d\n",
|
|
pci_dev_id->domain, pci_dev_id->bus,
|
|
PCI_SLOT(pci_dev_id->devfn),
|
|
PCI_FUNC(pci_dev_id->devfn));
|
|
}
|
|
spin_unlock_irqrestore(&device_ids_lock, flags);
|
|
|
|
return count;
|
|
}
|
|
static DRIVER_ATTR_RO(slots);
|
|
|
|
static ssize_t irq_handlers_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
size_t count = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (count >= PAGE_SIZE)
|
|
break;
|
|
if (!psdev->dev)
|
|
continue;
|
|
dev_data = pci_get_drvdata(psdev->dev);
|
|
if (!dev_data)
|
|
continue;
|
|
count +=
|
|
scnprintf(buf + count, PAGE_SIZE - count,
|
|
"%s:%s:%sing:%ld\n",
|
|
pci_name(psdev->dev),
|
|
dev_data->isr_on ? "on" : "off",
|
|
dev_data->ack_intr ? "ack" : "not ack",
|
|
dev_data->handled);
|
|
}
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
return count;
|
|
}
|
|
static DRIVER_ATTR_RO(irq_handlers);
|
|
|
|
static ssize_t irq_handler_state_store(struct device_driver *drv,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
int domain, bus, slot, func;
|
|
int err;
|
|
|
|
err = str_to_slot(buf, &domain, &bus, &slot, &func);
|
|
if (err)
|
|
return err;
|
|
|
|
psdev = pcistub_device_find(domain, bus, slot, func);
|
|
if (!psdev) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
dev_data = pci_get_drvdata(psdev->dev);
|
|
if (!dev_data) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
|
|
dev_data->irq_name, dev_data->isr_on,
|
|
!dev_data->isr_on);
|
|
|
|
dev_data->isr_on = !(dev_data->isr_on);
|
|
if (dev_data->isr_on)
|
|
dev_data->ack_intr = 1;
|
|
out:
|
|
if (psdev)
|
|
pcistub_device_put(psdev);
|
|
if (!err)
|
|
err = count;
|
|
return err;
|
|
}
|
|
static DRIVER_ATTR_WO(irq_handler_state);
|
|
|
|
static ssize_t quirks_store(struct device_driver *drv, const char *buf,
|
|
size_t count)
|
|
{
|
|
int domain, bus, slot, func, reg, size, mask;
|
|
int err;
|
|
|
|
err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size,
|
|
&mask);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
|
|
|
|
out:
|
|
if (!err)
|
|
err = count;
|
|
return err;
|
|
}
|
|
|
|
static ssize_t quirks_show(struct device_driver *drv, char *buf)
|
|
{
|
|
int count = 0;
|
|
unsigned long flags;
|
|
struct xen_pcibk_config_quirk *quirk;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
const struct config_field *field;
|
|
const struct config_field_entry *cfg_entry;
|
|
|
|
spin_lock_irqsave(&device_ids_lock, flags);
|
|
list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
count += scnprintf(buf + count, PAGE_SIZE - count,
|
|
"%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
|
|
quirk->pdev->bus->number,
|
|
PCI_SLOT(quirk->pdev->devfn),
|
|
PCI_FUNC(quirk->pdev->devfn),
|
|
quirk->devid.vendor, quirk->devid.device,
|
|
quirk->devid.subvendor,
|
|
quirk->devid.subdevice);
|
|
|
|
dev_data = pci_get_drvdata(quirk->pdev);
|
|
|
|
list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
|
|
field = cfg_entry->field;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
count += scnprintf(buf + count, PAGE_SIZE - count,
|
|
"\t\t%08x:%01x:%08x\n",
|
|
cfg_entry->base_offset +
|
|
field->offset, field->size,
|
|
field->mask);
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&device_ids_lock, flags);
|
|
|
|
return count;
|
|
}
|
|
static DRIVER_ATTR_RW(quirks);
|
|
|
|
static ssize_t permissive_store(struct device_driver *drv, const char *buf,
|
|
size_t count)
|
|
{
|
|
int domain, bus, slot, func;
|
|
int err;
|
|
struct pcistub_device *psdev;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
|
|
err = str_to_slot(buf, &domain, &bus, &slot, &func);
|
|
if (err)
|
|
goto out;
|
|
|
|
psdev = pcistub_device_find(domain, bus, slot, func);
|
|
if (!psdev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
dev_data = pci_get_drvdata(psdev->dev);
|
|
/* the driver data for a device should never be null at this point */
|
|
if (!dev_data) {
|
|
err = -ENXIO;
|
|
goto release;
|
|
}
|
|
if (!dev_data->permissive) {
|
|
dev_data->permissive = 1;
|
|
/* Let user know that what they're doing could be unsafe */
|
|
dev_warn(&psdev->dev->dev, "enabling permissive mode "
|
|
"configuration space accesses!\n");
|
|
dev_warn(&psdev->dev->dev,
|
|
"permissive mode is potentially unsafe!\n");
|
|
}
|
|
release:
|
|
pcistub_device_put(psdev);
|
|
out:
|
|
if (!err)
|
|
err = count;
|
|
return err;
|
|
}
|
|
|
|
static ssize_t permissive_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct pcistub_device *psdev;
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
size_t count = 0;
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (count >= PAGE_SIZE)
|
|
break;
|
|
if (!psdev->dev)
|
|
continue;
|
|
dev_data = pci_get_drvdata(psdev->dev);
|
|
if (!dev_data || !dev_data->permissive)
|
|
continue;
|
|
count +=
|
|
scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
|
|
pci_name(psdev->dev));
|
|
}
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
return count;
|
|
}
|
|
static DRIVER_ATTR_RW(permissive);
|
|
|
|
static void pcistub_exit(void)
|
|
{
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_remove_slot);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_permissive);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_irq_handlers);
|
|
driver_remove_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_irq_handler_state);
|
|
pci_unregister_driver(&xen_pcibk_pci_driver);
|
|
}
|
|
|
|
static int __init pcistub_init(void)
|
|
{
|
|
int pos = 0;
|
|
int err = 0;
|
|
int domain, bus, slot, func;
|
|
int parsed;
|
|
|
|
if (pci_devs_to_hide && *pci_devs_to_hide) {
|
|
do {
|
|
parsed = 0;
|
|
|
|
err = sscanf(pci_devs_to_hide + pos,
|
|
" (%x:%x:%x.%x) %n",
|
|
&domain, &bus, &slot, &func, &parsed);
|
|
switch (err) {
|
|
case 3:
|
|
func = -1;
|
|
sscanf(pci_devs_to_hide + pos,
|
|
" (%x:%x:%x.*) %n",
|
|
&domain, &bus, &slot, &parsed);
|
|
break;
|
|
case 2:
|
|
slot = func = -1;
|
|
sscanf(pci_devs_to_hide + pos,
|
|
" (%x:%x:*.*) %n",
|
|
&domain, &bus, &parsed);
|
|
break;
|
|
}
|
|
|
|
if (!parsed) {
|
|
domain = 0;
|
|
err = sscanf(pci_devs_to_hide + pos,
|
|
" (%x:%x.%x) %n",
|
|
&bus, &slot, &func, &parsed);
|
|
switch (err) {
|
|
case 2:
|
|
func = -1;
|
|
sscanf(pci_devs_to_hide + pos,
|
|
" (%x:%x.*) %n",
|
|
&bus, &slot, &parsed);
|
|
break;
|
|
case 1:
|
|
slot = func = -1;
|
|
sscanf(pci_devs_to_hide + pos,
|
|
" (%x:*.*) %n",
|
|
&bus, &parsed);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (parsed <= 0)
|
|
goto parse_error;
|
|
|
|
err = pcistub_device_id_add(domain, bus, slot, func);
|
|
if (err)
|
|
goto out;
|
|
|
|
pos += parsed;
|
|
} while (pci_devs_to_hide[pos]);
|
|
}
|
|
|
|
/* If we're the first PCI Device Driver to register, we're the
|
|
* first one to get offered PCI devices as they become
|
|
* available (and thus we can be the first to grab them)
|
|
*/
|
|
err = pci_register_driver(&xen_pcibk_pci_driver);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_new_slot);
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_remove_slot);
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_slots);
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_quirks);
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_permissive);
|
|
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_irq_handlers);
|
|
if (!err)
|
|
err = driver_create_file(&xen_pcibk_pci_driver.driver,
|
|
&driver_attr_irq_handler_state);
|
|
if (err)
|
|
pcistub_exit();
|
|
|
|
out:
|
|
return err;
|
|
|
|
parse_error:
|
|
pr_err("Error parsing pci_devs_to_hide at \"%s\"\n",
|
|
pci_devs_to_hide + pos);
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifndef MODULE
|
|
/*
|
|
* fs_initcall happens before device_initcall
|
|
* so xen_pcibk *should* get called first (b/c we
|
|
* want to suck up any device before other drivers
|
|
* get a chance by being the first pci device
|
|
* driver to register)
|
|
*/
|
|
fs_initcall(pcistub_init);
|
|
#endif
|
|
|
|
#ifdef CONFIG_PCI_IOV
|
|
static struct pcistub_device *find_vfs(const struct pci_dev *pdev)
|
|
{
|
|
struct pcistub_device *psdev = NULL;
|
|
unsigned long flags;
|
|
bool found = false;
|
|
|
|
spin_lock_irqsave(&pcistub_devices_lock, flags);
|
|
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
|
|
if (!psdev->pdev && psdev->dev != pdev
|
|
&& pci_physfn(psdev->dev) == pdev) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
|
|
if (found)
|
|
return psdev;
|
|
return NULL;
|
|
}
|
|
|
|
static int pci_stub_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
const struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
if (action != BUS_NOTIFY_UNBIND_DRIVER)
|
|
return NOTIFY_DONE;
|
|
|
|
if (!pdev->is_physfn)
|
|
return NOTIFY_DONE;
|
|
|
|
for (;;) {
|
|
struct pcistub_device *psdev = find_vfs(pdev);
|
|
if (!psdev)
|
|
break;
|
|
device_release_driver(&psdev->dev->dev);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block pci_stub_nb = {
|
|
.notifier_call = pci_stub_notifier,
|
|
};
|
|
#endif
|
|
|
|
static int __init xen_pcibk_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!xen_initial_domain())
|
|
return -ENODEV;
|
|
|
|
err = xen_pcibk_config_init();
|
|
if (err)
|
|
return err;
|
|
|
|
#ifdef MODULE
|
|
err = pcistub_init();
|
|
if (err < 0)
|
|
return err;
|
|
#endif
|
|
|
|
pcistub_init_devices_late();
|
|
err = xen_pcibk_xenbus_register();
|
|
if (err)
|
|
pcistub_exit();
|
|
#ifdef CONFIG_PCI_IOV
|
|
else
|
|
bus_register_notifier(&pci_bus_type, &pci_stub_nb);
|
|
#endif
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit xen_pcibk_cleanup(void)
|
|
{
|
|
#ifdef CONFIG_PCI_IOV
|
|
bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
|
|
#endif
|
|
xen_pcibk_xenbus_unregister();
|
|
pcistub_exit();
|
|
}
|
|
|
|
module_init(xen_pcibk_init);
|
|
module_exit(xen_pcibk_cleanup);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_ALIAS("xen-backend:pci");
|