Re: [Intel-gfx] [PATCH 07/53] drm/i915/xehp: Extra media engines - Part 1 (engine definitions)

From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Matt Roper <matthew.d.roper@intel.com>, intel-gfx@lists.freedesktop.org
Cc: Tomas Winkler <tomas.winkler@intel.com>, dri-devel@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 07/53] drm/i915/xehp: Extra media engines - Part 1 (engine definitions)
Date: Fri, 2 Jul 2021 13:22:59 +0100	[thread overview]
Message-ID: <01bcc598-8ebd-cc3f-1aa4-9d4dcc6f51f1@linux.intel.com> (raw)
In-Reply-To: <20210701202427.1547543-8-matthew.d.roper@intel.com>

On 01/07/2021 21:23, Matt Roper wrote:
> From: John Harrison <John.C.Harrison@Intel.com>
> 
> Xe_HP can have a lot of extra media engines. This patch adds the basic
> definitions for them.
> 
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
> ---
>   drivers/gpu/drm/i915/gt/gen8_engine_cs.c     |  7 ++-
>   drivers/gpu/drm/i915/gt/intel_engine_cs.c    | 50 ++++++++++++++++++++
>   drivers/gpu/drm/i915/gt/intel_engine_types.h | 14 ++++--
>   drivers/gpu/drm/i915/i915_reg.h              |  6 +++
>   4 files changed, 69 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> index 87b06572fd2e..35edc55720f4 100644
> --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> @@ -279,7 +279,7 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
>   	if (mode & EMIT_INVALIDATE)
>   		aux_inv = rq->engine->mask & ~BIT(BCS0);
>   	if (aux_inv)
> -		cmd += 2 * hweight8(aux_inv) + 2;
> +		cmd += 2 * hweight32(aux_inv) + 2;
>   
>   	cs = intel_ring_begin(rq, cmd);
>   	if (IS_ERR(cs))
> @@ -313,9 +313,8 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
>   		struct intel_engine_cs *engine;
>   		unsigned int tmp;
>   
> -		*cs++ = MI_LOAD_REGISTER_IMM(hweight8(aux_inv));
> -		for_each_engine_masked(engine, rq->engine->gt,
> -				       aux_inv, tmp) {
> +		*cs++ = MI_LOAD_REGISTER_IMM(hweight32(aux_inv));
> +		for_each_engine_masked(engine, rq->engine->gt, aux_inv, tmp) {
>   			*cs++ = i915_mmio_reg_offset(aux_inv_reg(engine));
>   			*cs++ = AUX_INV;
>   		}
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> index 4ab2c9abb943..6e2aa1acc4d4 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> @@ -104,6 +104,38 @@ static const struct engine_info intel_engines[] = {
>   			{ .graphics_ver = 11, .base = GEN11_BSD4_RING_BASE }
>   		},
>   	},
> +	[VCS4] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_DECODE_CLASS,
> +		.instance = 4,
> +		.mmio_bases = {
> +			{ .graphics_ver = 11, .base = XEHP_BSD5_RING_BASE }
> +		},
> +	},
> +	[VCS5] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_DECODE_CLASS,
> +		.instance = 5,
> +		.mmio_bases = {
> +			{ .graphics_ver = 12, .base = XEHP_BSD6_RING_BASE }
> +		},
> +	},
> +	[VCS6] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_DECODE_CLASS,
> +		.instance = 6,
> +		.mmio_bases = {
> +			{ .graphics_ver = 12, .base = XEHP_BSD7_RING_BASE }
> +		},
> +	},
> +	[VCS7] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_DECODE_CLASS,
> +		.instance = 7,
> +		.mmio_bases = {
> +			{ .graphics_ver = 12, .base = XEHP_BSD8_RING_BASE }
> +		},
> +	},
>   	[VECS0] = {
>   		.hw_id = VECS0_HW,
>   		.class = VIDEO_ENHANCEMENT_CLASS,
> @@ -121,6 +153,22 @@ static const struct engine_info intel_engines[] = {
>   			{ .graphics_ver = 11, .base = GEN11_VEBOX2_RING_BASE }
>   		},
>   	},
> +	[VECS2] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_ENHANCEMENT_CLASS,
> +		.instance = 2,
> +		.mmio_bases = {
> +			{ .graphics_ver = 12, .base = XEHP_VEBOX3_RING_BASE }
> +		},
> +	},
> +	[VECS3] = {
> +		.hw_id = 0, /* not used in GEN12+, see MI_SEMAPHORE_SIGNAL */
> +		.class = VIDEO_ENHANCEMENT_CLASS,
> +		.instance = 3,
> +		.mmio_bases = {
> +			{ .graphics_ver = 12, .base = XEHP_VEBOX4_RING_BASE }
> +		},
> +	},
>   };
>   
>   /**
> @@ -269,6 +317,8 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
>   
>   	BUILD_BUG_ON(MAX_ENGINE_CLASS >= BIT(GEN11_ENGINE_CLASS_WIDTH));
>   	BUILD_BUG_ON(MAX_ENGINE_INSTANCE >= BIT(GEN11_ENGINE_INSTANCE_WIDTH));
> +	BUILD_BUG_ON(I915_MAX_VCS > (MAX_ENGINE_INSTANCE + 1));
> +	BUILD_BUG_ON(I915_MAX_VECS > (MAX_ENGINE_INSTANCE + 1));
>   
>   	if (GEM_DEBUG_WARN_ON(id >= ARRAY_SIZE(gt->engine)))
>   		return -EINVAL;
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> index 5b91068ab277..b25f594a7e4b 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> @@ -46,7 +46,7 @@
>   #define COPY_ENGINE_CLASS	3
>   #define OTHER_CLASS		4
>   #define MAX_ENGINE_CLASS	4
> -#define MAX_ENGINE_INSTANCE	3
> +#define MAX_ENGINE_INSTANCE	7
>   
>   #define I915_MAX_SLICES	3
>   #define I915_MAX_SUBSLICES 8
> @@ -64,7 +64,7 @@ struct intel_gt;
>   struct intel_ring;
>   struct intel_uncore;
>   
> -typedef u8 intel_engine_mask_t;
> +typedef u32 intel_engine_mask_t;

u16 would be enough but it's probably pointless unless it makes it 
better considering what I'll write next.

What I'd do is reorder the fields in struct intel_gt_info to avoid 
padding, probably just pulling l3bank_mask up to be second is best.

Similar for struct intel_device_info because there's a ton of those and 
so historically we were actually laying it out with care. A perfect 
solution while keeping logical grouping might not be possible but worth 
having a look.

Regards,

Tvrtko

>   #define ALL_ENGINES ((intel_engine_mask_t)~0ul)
>   
>   struct intel_hw_status_page {
> @@ -101,8 +101,8 @@ struct i915_ctx_workarounds {
>   	struct i915_vma *vma;
>   };
>   
> -#define I915_MAX_VCS	4
> -#define I915_MAX_VECS	2
> +#define I915_MAX_VCS	8
> +#define I915_MAX_VECS	4
>   
>   /*
>    * Engine IDs definitions.
> @@ -115,9 +115,15 @@ enum intel_engine_id {
>   	VCS1,
>   	VCS2,
>   	VCS3,
> +	VCS4,
> +	VCS5,
> +	VCS6,
> +	VCS7,
>   #define _VCS(n) (VCS0 + (n))
>   	VECS0,
>   	VECS1,
> +	VECS2,
> +	VECS3,
>   #define _VECS(n) (VECS0 + (n))
>   	I915_NUM_ENGINES
>   #define INVALID_ENGINE ((enum intel_engine_id)-1)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index f7dad8541417..d4546e871833 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2516,9 +2516,15 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>   #define GEN11_BSD2_RING_BASE	0x1c4000
>   #define GEN11_BSD3_RING_BASE	0x1d0000
>   #define GEN11_BSD4_RING_BASE	0x1d4000
> +#define XEHP_BSD5_RING_BASE	0x1e0000
> +#define XEHP_BSD6_RING_BASE	0x1e4000
> +#define XEHP_BSD7_RING_BASE	0x1f0000
> +#define XEHP_BSD8_RING_BASE	0x1f4000
>   #define VEBOX_RING_BASE		0x1a000
>   #define GEN11_VEBOX_RING_BASE		0x1c8000
>   #define GEN11_VEBOX2_RING_BASE		0x1d8000
> +#define XEHP_VEBOX3_RING_BASE		0x1e8000
> +#define XEHP_VEBOX4_RING_BASE		0x1f8000
>   #define BLT_RING_BASE		0x22000
>   #define RING_TAIL(base)		_MMIO((base) + 0x30)
>   #define RING_HEAD(base)		_MMIO((base) + 0x34)
> 
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