drm/xe: Move BAR definitions to dedicated file

We should keep all hardware definitions separated from the driver
code. Move LMEM_BAR definition to new regs/xe_bars.h file and also
add there GTTMMADR_BAR definition to avoid using magic 0 resource.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240530133527.1328-3-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/regs/xe_bars.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+#ifndef _XE_BARS_H_
+#define _XE_BARS_H_
+
+#define GTTMMADR_BAR			0 /* MMIO + GTT */
+#define LMEM_BAR			2 /* VRAM */
+
+#endif

drivers/gpu/drm/xe/xe_mmio.c

@@ -12,6 +12,7 @@
 #include <drm/drm_managed.h>
 #include <drm/xe_drm.h>
 
+#include "regs/xe_bars.h"
 #include "regs/xe_engine_regs.h"
 #include "regs/xe_gt_regs.h"
 #include "regs/xe_regs.h"
@@ -435,7 +436,7 @@ int xe_mmio_init(struct xe_device *xe)
 	 * registers (0-4MB), reserved space (4MB-8MB) and GGTT (8MB-16MB).
 	 */
 	xe->mmio.size = pci_resource_len(pdev, mmio_bar);
-	xe->mmio.regs = pci_iomap(pdev, mmio_bar, 0);
+	xe->mmio.regs = pci_iomap(pdev, mmio_bar, GTTMMADR_BAR);
 	if (xe->mmio.regs == NULL) {
 		drm_err(&xe->drm, "failed to map registers\n");
 		return -EIO;

drivers/gpu/drm/xe/xe_mmio.h

@@ -11,8 +11,6 @@
 struct xe_device;
 struct xe_reg;
 
-#define LMEM_BAR		2
-
 int xe_mmio_init(struct xe_device *xe);
 int xe_mmio_probe_tiles(struct xe_device *xe);
 

drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c

@@ -13,6 +13,7 @@
 
 #include <generated/xe_wa_oob.h>
 
+#include "regs/xe_bars.h"
 #include "regs/xe_gt_regs.h"
 #include "regs/xe_regs.h"
 #include "xe_bo.h"