drm/xe/vf: Obtain value of GMDID register from GuC

VFs don't have access to the GMDID register and must obtain it
value using GuC VF ABI KLV query. Add function for doing that.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240523192240.844-4-michal.wajdeczko@intel.com

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
index 237486a80fb5e1bf02d90914ff1d6da6a1e80a8e..5b8771f831f7a66cc3916ba9fa614648ee2c4871 100644 (file)
--- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
@@ -284,6 +284,35 @@ static int guc_action_query_single_klv64(struct xe_guc *guc, u32 key, u64 *value
        return 0;
 }
 
+/**
+ * xe_gt_sriov_vf_gmdid - Query GMDID over MMIO.
+ * @gt: the &xe_gt
+ *
+ * This function is for VF use only.
+ *
+ * Return: value of GMDID KLV on success or 0 on failure.
+ */
+u32 xe_gt_sriov_vf_gmdid(struct xe_gt *gt)
+{
+       const char *type = xe_gt_is_media_type(gt) ? "media" : "graphics";
+       struct xe_guc *guc = &gt->uc.guc;
+       u32 value;
+       int err;
+
+       xe_gt_assert(gt, IS_SRIOV_VF(gt_to_xe(gt)));
+       xe_gt_assert(gt, gt->sriov.vf.guc_version.major > 1 || gt->sriov.vf.guc_version.minor >= 2);
+
+       err = guc_action_query_single_klv32(guc, GUC_KLV_GLOBAL_CFG_GMD_ID_KEY, &value);
+       if (unlikely(err)) {
+               xe_gt_sriov_err(gt, "Failed to obtain %s GMDID (%pe)\n",
+                               type, ERR_PTR(err));
+               return 0;
+       }
+
+       xe_gt_sriov_dbg(gt, "%s GMDID = %#x\n", type, value);
+       return value;
+}
+
 static int vf_get_ggtt_info(struct xe_gt *gt)
 {
        struct xe_gt_sriov_vf_selfconfig *config = &gt->sriov.vf.self_config;

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
index be69c1025320ad1b5ee3cd6d186837d4b03d285f..0391ed72a57053fc6f45ef926bc8ab7a97618e07 100644 (file)
--- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
@@ -17,6 +17,7 @@ int xe_gt_sriov_vf_query_config(struct xe_gt *gt);
 int xe_gt_sriov_vf_connect(struct xe_gt *gt);
 int xe_gt_sriov_vf_query_runtime(struct xe_gt *gt);
 
+u32 xe_gt_sriov_vf_gmdid(struct xe_gt *gt);
 u16 xe_gt_sriov_vf_guc_ids(struct xe_gt *gt);
 u32 xe_gt_sriov_vf_read32(struct xe_gt *gt, struct xe_reg reg);