drm/xe: Don't "peek" into GMD_ID

Now that MMIO init got moved to device early, we can use regular
xe_mmio_read helpers to get to GMD_ID register.
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_pci.c

@@ -21,6 +21,7 @@
 #include "xe_drv.h"
 #include "xe_gt.h"
 #include "xe_macros.h"
+#include "xe_mmio.h"
 #include "xe_module.h"
 #include "xe_pci_types.h"
 #include "xe_pm.h"
@@ -444,26 +445,22 @@ find_subplatform(const struct xe_device *xe, const struct xe_device_desc *desc)
 	return NULL;
 }
 
-static void peek_gmdid(struct xe_device *xe, u32 gmdid_offset, u32 *ver, u32 *revid)
+enum xe_gmdid_type {
+	GMDID_GRAPHICS,
+	GMDID_MEDIA
+};
+
+static void read_gmdid(struct xe_device *xe, enum xe_gmdid_type type, u32 *ver, u32 *revid)
 {
-	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
-	void __iomem *map = pci_iomap_range(pdev, 0, gmdid_offset, sizeof(u32));
+	struct xe_gt *gt = xe_root_mmio_gt(xe);
+	struct xe_reg gmdid_reg = GMD_ID;
 	u32 val;
 
-	if (!map) {
-		drm_err(&xe->drm, "Failed to read GMD_ID (%#x) from PCI BAR.\n",
-			gmdid_offset);
-		*ver = 0;
-		*revid = 0;
+	if (type == GMDID_MEDIA)
+		gmdid_reg.addr += MEDIA_GT_GSI_OFFSET;
 
-		return;
-	}
-
-	val = ioread32(map);
-	pci_iounmap(pdev, map);
-
-	*ver = REG_FIELD_GET(GMD_ID_ARCH_MASK, val) * 100 +
-		REG_FIELD_GET(GMD_ID_RELEASE_MASK, val);
+	val = xe_mmio_read32(gt, gmdid_reg);
+	*ver = REG_FIELD_GET(GMD_ID_ARCH_MASK, val) * 100 + REG_FIELD_GET(GMD_ID_RELEASE_MASK, val);
 	*revid = REG_FIELD_GET(GMD_ID_REVID, val);
 }
 
@@ -496,7 +493,8 @@ static void handle_gmdid(struct xe_device *xe,
 {
 	u32 ver;
 
-	peek_gmdid(xe, GMD_ID.addr, &ver, graphics_revid);
+	read_gmdid(xe, GMDID_GRAPHICS, &ver, graphics_revid);
+
 	for (int i = 0; i < ARRAY_SIZE(graphics_ip_map); i++) {
 		if (ver == graphics_ip_map[i].ver) {
 			xe->info.graphics_verx100 = ver;
@@ -511,7 +509,7 @@ static void handle_gmdid(struct xe_device *xe,
 			ver / 100, ver % 100);
 	}
 
-	peek_gmdid(xe, GMD_ID.addr + 0x380000, &ver, media_revid);
+	read_gmdid(xe, GMDID_MEDIA, &ver, media_revid);
 
 	/* Media may legitimately be fused off / not present */
 	if (ver == 0)