Re: [PATCH 3/4] drm/i915/gt: rename legacy engine->hw_id to engine->gen6_hw_id

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On 21/07/2021 00:20, Lucas De Marchi wrote:
We kept adding new engines and for that increasing hw_id unnecessarily:
it's not used since GRAPHICS_VER == 8. Prepend "gen6" to the field and
try to pack it in the structs to give a hint this field is actually not
used in recent platforms.

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/intel_engine_cs.c    | 12 ++++++------
  drivers/gpu/drm/i915/gt/intel_engine_types.h |  2 +-
  drivers/gpu/drm/i915/i915_reg.h              |  2 +-
  3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index a11f69f2e46e..508221de411c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -42,7 +42,7 @@
#define MAX_MMIO_BASES 3
  struct engine_info {
-	unsigned int hw_id;
+	u8 gen6_hw_id;
  	u8 class;
  	u8 instance;
  	/* mmio bases table *must* be sorted in reverse graphics_ver order */
@@ -54,7 +54,7 @@ struct engine_info {
static const struct engine_info intel_engines[] = {
  	[RCS0] = {
-		.hw_id = RCS0_HW,
+		.gen6_hw_id = RCS0_HW,
  		.class = RENDER_CLASS,
  		.instance = 0,
  		.mmio_bases = {
@@ -62,7 +62,7 @@ static const struct engine_info intel_engines[] = {
  		},
  	},
  	[BCS0] = {
-		.hw_id = BCS0_HW,
+		.gen6_hw_id = BCS0_HW,
  		.class = COPY_ENGINE_CLASS,
  		.instance = 0,
  		.mmio_bases = {
@@ -70,7 +70,7 @@ static const struct engine_info intel_engines[] = {
  		},
  	},
  	[VCS0] = {
-		.hw_id = VCS0_HW,
+		.gen6_hw_id = VCS0_HW,
  		.class = VIDEO_DECODE_CLASS,
  		.instance = 0,
  		.mmio_bases = {
@@ -102,7 +102,7 @@ static const struct engine_info intel_engines[] = {
  		},
  	},
  	[VECS0] = {
-		.hw_id = VECS0_HW,
+		.gen6_hw_id = VECS0_HW,
  		.class = VIDEO_ENHANCEMENT_CLASS,
  		.instance = 0,
  		.mmio_bases = {
@@ -290,7 +290,7 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
  	engine->i915 = i915;
  	engine->gt = gt;
  	engine->uncore = gt->uncore;
-	engine->hw_id = info->hw_id;
+	engine->gen6_hw_id = info->gen6_hw_id;
  	guc_class = engine_class_to_guc_class(info->class);
  	engine->guc_id = MAKE_GUC_ID(guc_class, info->instance);
  	engine->mmio_base = __engine_mmio_base(i915, info->mmio_bases);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index a107eb58ffa2..266422d8d1b1 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -264,11 +264,11 @@ struct intel_engine_cs {
  	enum intel_engine_id id;
  	enum intel_engine_id legacy_idx;
- unsigned int hw_id;
  	unsigned int guc_id;
intel_engine_mask_t mask; + u8 gen6_hw_id;
  	u8 class;
  	u8 instance;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 943fe485c662..8750ffce9d61 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2572,7 +2572,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
  #define   ARB_MODE_BWGTLB_DISABLE (1 << 9)
  #define   ARB_MODE_SWIZZLE_BDW	(1 << 1)
  #define RENDER_HWS_PGA_GEN7	_MMIO(0x04080)
-#define RING_FAULT_REG(engine)	_MMIO(0x4094 + 0x100 * (engine)->hw_id)
+#define RING_FAULT_REG(engine)	_MMIO(0x4094 + 0x100 * (engine)->gen6_hw_id)
  #define GEN8_RING_FAULT_REG	_MMIO(0x4094)
  #define GEN12_RING_FAULT_REG	_MMIO(0xcec4)
  #define   GEN8_RING_FAULT_ENGINE_ID(x)	(((x) >> 12) & 0x7)


Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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