[PATCH v6 10/11] drm/xe/configfs: Only allow configurations for supported devices

[Michal Wajdeczko]

Since we already lookup for the real PCI device before we allow
to create its directory config, we might also check if the found
device matches our driver PCI ID list. This will prevent creation
of the directory configs for the unsupported devices.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
v2: rebased
v3: don't use -ECANCELED, print message instead (Rodrigo, John)
---
 drivers/gpu/drm/xe/xe_configfs.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_configfs.c b/drivers/gpu/drm/xe/xe_configfs.c
index 5f145ccdf535..0e2da7907afc 100644
--- a/drivers/gpu/drm/xe/xe_configfs.c
+++ b/drivers/gpu/drm/xe/xe_configfs.c
@@ -275,11 +275,22 @@ static const struct config_item_type xe_config_device_type = {
 	.ct_owner	= THIS_MODULE,
 };
 
+static const struct xe_device_desc *xe_match_desc(struct pci_dev *pdev)
+{
+	struct device_driver *driver = driver_find("xe", &pci_bus_type);
+	struct pci_driver *drv = to_pci_driver(driver);
+	const struct pci_device_id *ids = drv ? drv->id_table : NULL;
+	const struct pci_device_id *found = pci_match_id(ids, pdev);
+
+	return found ? (const void *)found->driver_data : NULL;
+}
+
 static struct config_group *xe_config_make_device_group(struct config_group *group,
 							const char *name)
 {
 	unsigned int domain, bus, slot, function;
 	struct xe_config_group_device *dev;
+	const struct xe_device_desc *match;
 	struct pci_dev *pdev;
 	char canonical[16];
 	int ret;
@@ -297,8 +308,16 @@ static struct config_group *xe_config_make_device_group(struct config_group *gro
 	pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(slot, function));
 	if (!pdev)
 		return ERR_PTR(-ENODEV);
+
+	match = xe_match_desc(pdev);
+	if (!match)
+		pci_info(pdev, "xe driver does not support configuration of this device\n");
+
 	pci_dev_put(pdev);
 
+	if (!match)
+		return ERR_PTR(-ENOENT);
+
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return ERR_PTR(-ENOMEM);
-- 
2.47.1