drm/i915/guc: Keep iosys_map of ads_blob around

Convert intel_guc_ads_create() and initialization to use iosys_map
rather than plain pointer and save it in the guc struct. This will help
with additional updates to the ads_blob after the
creation/initialization by abstracting the IO vs system memory.

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220216174147.3073235-5-lucas.demarchi@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc.h

@@ -6,8 +6,9 @@
 #ifndef _INTEL_GUC_H_
 #define _INTEL_GUC_H_
 
-#include <linux/xarray.h>
 #include <linux/delay.h>
+#include <linux/iosys-map.h>
+#include <linux/xarray.h>
 
 #include "intel_uncore.h"
 #include "intel_guc_fw.h"
@@ -148,6 +149,7 @@ struct intel_guc {
 	struct i915_vma *ads_vma;
 	/** @ads_blob: contents of the GuC ADS */
 	struct __guc_ads_blob *ads_blob;
+	struct iosys_map ads_map;
 	/** @ads_regset_size: size of the save/restore regsets in the ADS */
 	u32 ads_regset_size;
 	/**

drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c

@@ -666,6 +666,11 @@ int intel_guc_ads_create(struct intel_guc *guc)
 	if (ret)
 		return ret;
 
+	if (i915_gem_object_is_lmem(guc->ads_vma->obj))
+		iosys_map_set_vaddr_iomem(&guc->ads_map, (void __iomem *)guc->ads_blob);
+	else
+		iosys_map_set_vaddr(&guc->ads_map, guc->ads_blob);
+
 	__guc_ads_init(guc);
 
 	return 0;
@@ -687,6 +692,7 @@ void intel_guc_ads_destroy(struct intel_guc *guc)
 {
 	i915_vma_unpin_and_release(&guc->ads_vma, I915_VMA_RELEASE_MAP);
 	guc->ads_blob = NULL;
+	iosys_map_clear(&guc->ads_map);
 	kfree(guc->ads_regset);
 }