[PATCH 08/19] drm/i915/guc: Convert engine record to dma_buf_map

[Lucas De Marchi <lucas.demarchi@intel.com>]

Use dma_buf_map to read fields from the dma_blob so access to IO and
system memory is abstracted away.

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>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c        | 14 ++++++--------
 drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h        |  3 ++-
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 11 +++++++----
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
index 2ffe5836f95e..fe1e71adfca1 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -698,18 +698,16 @@ void intel_guc_ads_reset(struct intel_guc *guc)
 
 u32 intel_guc_engine_usage_offset(struct intel_guc *guc)
 {
-	struct __guc_ads_blob *blob = guc->ads_blob;
-	u32 base = intel_guc_ggtt_offset(guc, guc->ads_vma);
-	u32 offset = base + ptr_offset(blob, engine_usage);
-
-	return offset;
+	return intel_guc_ggtt_offset(guc, guc->ads_vma) +
+		offsetof(struct __guc_ads_blob, engine_usage);
 }
 
-struct guc_engine_usage_record *intel_guc_engine_usage(struct intel_engine_cs *engine)
+struct dma_buf_map intel_guc_engine_usage_record_map(struct intel_engine_cs *engine)
 {
 	struct intel_guc *guc = &engine->gt->uc.guc;
-	struct __guc_ads_blob *blob = guc->ads_blob;
 	u8 guc_class = engine_class_to_guc_class(engine->class);
+	size_t offset = offsetof(struct __guc_ads_blob,
+				 engine_usage.engines[guc_class][ilog2(engine->logical_mask)]);
 
-	return &blob->engine_usage.engines[guc_class][ilog2(engine->logical_mask)];
+	return DMA_BUF_MAP_INIT_OFFSET(&guc->ads_map, offset);
 }
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h
index e74c110facff..27f5b1f9ddac 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h
@@ -7,6 +7,7 @@
 #define _INTEL_GUC_ADS_H_
 
 #include <linux/types.h>
+#include <linux/dma-buf-map.h>
 
 struct intel_guc;
 struct drm_printer;
@@ -18,7 +19,7 @@ void intel_guc_ads_init_late(struct intel_guc *guc);
 void intel_guc_ads_reset(struct intel_guc *guc);
 void intel_guc_ads_print_policy_info(struct intel_guc *guc,
 				     struct drm_printer *p);
-struct guc_engine_usage_record *intel_guc_engine_usage(struct intel_engine_cs *engine);
+struct dma_buf_map intel_guc_engine_usage_record_map(struct intel_engine_cs *engine);
 u32 intel_guc_engine_usage_offset(struct intel_guc *guc);
 
 #endif
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index db9615dcb0ec..57bfb4ad0ab8 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1125,14 +1125,17 @@ __extend_last_switch(struct intel_guc *guc, u64 *prev_start, u32 new_start)
 	*prev_start = ((u64)gt_stamp_hi << 32) | new_start;
 }
 
+#define record_read(map_, field_) \
+	dma_buf_map_read_field(map_, struct guc_engine_usage_record, field_)
+
 static void guc_update_engine_gt_clks(struct intel_engine_cs *engine)
 {
-	struct guc_engine_usage_record *rec = intel_guc_engine_usage(engine);
+	struct dma_buf_map rec_map = intel_guc_engine_usage_record_map(engine);
 	struct intel_engine_guc_stats *stats = &engine->stats.guc;
 	struct intel_guc *guc = &engine->gt->uc.guc;
-	u32 last_switch = rec->last_switch_in_stamp;
-	u32 ctx_id = rec->current_context_index;
-	u32 total = rec->total_runtime;
+	u32 last_switch = record_read(&rec_map, last_switch_in_stamp);
+	u32 ctx_id = record_read(&rec_map, current_context_index);
+	u32 total = record_read(&rec_map, total_runtime);
 
 	lockdep_assert_held(&guc->timestamp.lock);
 
-- 
2.35.0