From: Michal Wajdeczko <michal.wajdeczko@intel.com>
Date: Thu, 23 May 2024 19:22:37 +0000 (+0200)
Subject: drm/xe/vf: Obtain value of GMDID register from GuC
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=2948b24233cfe3c8f2c071b6c83efc3e05881023;p=users%2Fwilly%2Fxarray.git

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 237486a80fb5..5b8771f831f7 100644
--- 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 be69c1025320..0391ed72a570 100644
--- 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);