From: Lukasz Laguna <lukasz.laguna@intel.com>
Date: Thu, 16 Oct 2025 12:22:33 +0000 (+0200)
Subject: drm/xe/pf: Always expose VRAM provisioning data on discrete GPUs
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=37c8c8d9c6ad0b34b662074b66fbe0dcde9d1fed;p=thirdparty%2Fkernel%2Flinux.git

drm/xe/pf: Always expose VRAM provisioning data on discrete GPUs

Currently, VRAM provisioning data is only exposed if the device supports
LMTT. While it should not be possible to modify VRAM provisioning on
platforms without LMTT, it is still useful to be able to read the VRAM
provisioning data on all discrete GPU platforms.

Expose the VRAM debugfs attributes whenever running on dGFX, adjusting
file permissions to read only when LMTT is not available.

Signed-off-by: Lukasz Laguna <lukasz.laguna@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20251016122233.3789-1-lukasz.laguna@intel.com
---

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
index b2e5c52978e6a..c0c0215c07036 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
@@ -1548,7 +1548,8 @@ int xe_gt_sriov_pf_config_set_lmem(struct xe_gt *gt, unsigned int vfid, u64 size
 {
 	int err;
 
-	xe_gt_assert(gt, xe_device_has_lmtt(gt_to_xe(gt)));
+	if (!xe_device_has_lmtt(gt_to_xe(gt)))
+		return -EPERM;
 
 	mutex_lock(xe_gt_sriov_pf_master_mutex(gt));
 	if (vfid)
diff --git a/drivers/gpu/drm/xe/xe_tile_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_tile_sriov_pf_debugfs.c
index c8df18af4d00c..6ba2332c77d41 100644
--- a/drivers/gpu/drm/xe/xe_tile_sriov_pf_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_tile_sriov_pf_debugfs.c
@@ -165,14 +165,17 @@ DEFINE_SRIOV_TILE_CONFIG_DEBUGFS_ATTRIBUTE(vram, lmem, u64, "%llu\n");
 
 static void pf_add_config_attrs(struct xe_tile *tile, struct dentry *dent, unsigned int vfid)
 {
+	struct xe_device *xe = tile->xe;
+
 	xe_tile_assert(tile, tile == extract_tile(dent));
 	xe_tile_assert(tile, vfid == extract_vfid(dent));
 
 	debugfs_create_file_unsafe(vfid ? "ggtt_quota" : "ggtt_spare",
 				   0644, dent, dent, &ggtt_fops);
-	if (xe_device_has_lmtt(tile->xe))
+	if (IS_DGFX(xe))
 		debugfs_create_file_unsafe(vfid ? "vram_quota" : "vram_spare",
-					   0644, dent, dent, &vram_fops);
+					   xe_device_has_lmtt(xe) ? 0644 : 0444,
+					   dent, dent, &vram_fops);
 }
 
 static void pf_populate_tile(struct xe_tile *tile, struct dentry *dent, unsigned int vfid)
@@ -188,7 +191,7 @@ static void pf_populate_tile(struct xe_tile *tile, struct dentry *dent, unsigned
 		drm_debugfs_create_files(pf_ggtt_info,
 					 ARRAY_SIZE(pf_ggtt_info),
 					 dent, minor);
-		if (xe_device_has_lmtt(xe))
+		if (IS_DGFX(xe))
 			drm_debugfs_create_files(pf_vram_info,
 						 ARRAY_SIZE(pf_vram_info),
 						 dent, minor);