diff options
| -rw-r--r-- | drivers/gpu/drm/xe/xe_configfs.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_configfs.c b/drivers/gpu/drm/xe/xe_configfs.c index 29a12d02443d..1025d3979b06 100644 --- a/drivers/gpu/drm/xe/xe_configfs.c +++ b/drivers/gpu/drm/xe/xe_configfs.c @@ -75,6 +75,8 @@ * * # echo 1 > /sys/kernel/config/xe/0000:03:00.0/survivability_mode * + * This attribute can only be set before binding to the device. + * * Allowed engines: * ---------------- * @@ -99,6 +101,8 @@ * available for migrations, but it's disabled. This is intended for debugging * purposes only. * + * This attribute can only be set before binding to the device. + * * PSMI * ---- * @@ -109,6 +113,8 @@ * * # echo 1 > /sys/kernel/config/xe/0000:03:00.0/enable_psmi * + * This attribute can only be set before binding to the device. + * * Remove devices * ============== * @@ -169,6 +175,32 @@ static struct xe_config_device *to_xe_config_device(struct config_item *item) return &to_xe_config_group_device(item)->config; } +static bool is_bound(struct xe_config_group_device *dev) +{ + unsigned int domain, bus, slot, function; + struct pci_dev *pdev; + const char *name; + bool ret; + + lockdep_assert_held(&dev->lock); + + name = dev->group.cg_item.ci_name; + if (sscanf(name, "%x:%x:%x.%x", &domain, &bus, &slot, &function) != 4) + return false; + + pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(slot, function)); + if (!pdev) + return false; + + ret = pci_get_drvdata(pdev); + pci_dev_put(pdev); + + if (ret) + pci_dbg(pdev, "Already bound to driver\n"); + + return ret; +} + static ssize_t survivability_mode_show(struct config_item *item, char *page) { struct xe_config_device *dev = to_xe_config_device(item); @@ -187,6 +219,9 @@ static ssize_t survivability_mode_store(struct config_item *item, const char *pa return ret; guard(mutex)(&dev->lock); + if (is_bound(dev)) + return -EBUSY; + dev->config.survivability_mode = survivability_mode; return len; @@ -270,6 +305,9 @@ static ssize_t engines_allowed_store(struct config_item *item, const char *page, } guard(mutex)(&dev->lock); + if (is_bound(dev)) + return -EBUSY; + dev->config.engines_allowed = val; return len; @@ -293,6 +331,9 @@ static ssize_t enable_psmi_store(struct config_item *item, const char *page, siz return ret; guard(mutex)(&dev->lock); + if (is_bound(dev)) + return -EBUSY; + dev->config.enable_psmi = val; return len; |