[2/2] drm/i915: move gen8 irq shifts to intel_lrc.c

Commit Message

Daniele Ceraolo Spurio March 12, 2018, 11:47 p.m. UTC

The only usage outside the intel_lrc.c file is in the ringbuffer
init, but the irq mask calculated there is then overwritten for
all engines that have a non-zero shift, so we can drop it.

This change is not aimed at code saving but at removing from
intel_engines information that does not apply to all gens that have
the engine. When checking without the temporary WARN_ON, code size
is basically unchanged.

v2: make the irq_shifts array static const
v3: rebase, move irq_shifts array to logical_ring_default_irqs

Suggested-by: Michel Thierry <[e-mail]>
Signed-off-by: Daniele Ceraolo Spurio <[e-mail]>
Cc: Chris Wilson <[e-mail]>
Reviewed-by: Chris Wilson <[e-mail]> #v2
---
 drivers/gpu/drm/i915/intel_engine_cs.c  | 10 ----------
 drivers/gpu/drm/i915/intel_lrc.c        | 14 +++++++++++++-
 drivers/gpu/drm/i915/intel_ringbuffer.c |  4 ++--
 drivers/gpu/drm/i915/intel_ringbuffer.h |  1 -
 4 files changed, 15 insertions(+), 14 deletions(-)

Comments

Chris Wilson March 13, 2018, 12:05 a.m. UTC | #1

Quoting Daniele Ceraolo Spurio (2018-03-12 23:47:48)
> The only usage outside the intel_lrc.c file is in the ringbuffer
> init, but the irq mask calculated there is then overwritten for
> all engines that have a non-zero shift, so we can drop it.
> 
> This change is not aimed at code saving but at removing from
> intel_engines information that does not apply to all gens that have
> the engine. When checking without the temporary WARN_ON, code size
> is basically unchanged.
> 
> v2: make the irq_shifts array static const
> v3: rebase, move irq_shifts array to logical_ring_default_irqs
> 
> Suggested-by: Michel Thierry <[e-mail]>
> Signed-off-by: Daniele Ceraolo Spurio <[e-mail]>
> Cc: Chris Wilson <[e-mail]>
> Reviewed-by: Chris Wilson <[e-mail]> #v2
> ---
> index 5e8f6896d059..aa1587c213aa 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -2118,7 +2118,19 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
>  static inline void
>  logical_ring_default_irqs(struct intel_engine_cs *engine)
>  {
> -       unsigned shift = engine->irq_shift;
> +       /* irq shifts for gen 8-10 */

You can plonk the array inside the gen8-10 branch so you don't even need
the comment.

> +       const unsigned int irq_shifts[] = {
> +               [RCS] = GEN8_RCS_IRQ_SHIFT,
> +               [BCS] = GEN8_BCS_IRQ_SHIFT,
> +               [VCS] = GEN8_VCS1_IRQ_SHIFT,
> +               [VCS2] = GEN8_VCS2_IRQ_SHIFT,
> +               [VECS] = GEN8_VECS_IRQ_SHIFT,
> +       };

Make it u8.

Reviewed-by: Chris Wilson <[e-mail]>

You'll need to resend as a new thread as patchwork doesn't handle a
series gaining patches gracefully.
-Chris

Patch

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 28031bdba79b..dd0860d350bc 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -92,7 +92,6 @@  struct engine_info {
 		u32 gen : 8;
 		u32 base : 24;
 	} mmio_bases[MAX_MMIO_BASES];
-	unsigned irq_shift;
 };
 
 static const struct engine_info intel_engines[] = {
@@ -104,7 +103,6 @@  static const struct engine_info intel_engines[] = {
 		.mmio_bases = {
 			{ .gen = 1, .base = RENDER_RING_BASE }
 		},
-		.irq_shift = GEN8_RCS_IRQ_SHIFT,
 	},
 	[BCS] = {
 		.hw_id = BCS_HW,
@@ -114,7 +112,6 @@  static const struct engine_info intel_engines[] = {
 		.mmio_bases = {
 			{ .gen = 6, .base = BLT_RING_BASE }
 		},
-		.irq_shift = GEN8_BCS_IRQ_SHIFT,
 	},
 	[VCS] = {
 		.hw_id = VCS_HW,
@@ -126,7 +123,6 @@  static const struct engine_info intel_engines[] = {
 			{ .gen = 6, .base = GEN6_BSD_RING_BASE },
 			{ .gen = 4, .base = BSD_RING_BASE }
 		},
-		.irq_shift = GEN8_VCS1_IRQ_SHIFT,
 	},
 	[VCS2] = {
 		.hw_id = VCS2_HW,
@@ -137,7 +133,6 @@  static const struct engine_info intel_engines[] = {
 			{ .gen = 11, .base = GEN11_BSD2_RING_BASE },
 			{ .gen = 8, .base = GEN8_BSD2_RING_BASE }
 		},
-		.irq_shift = GEN8_VCS2_IRQ_SHIFT,
 	},
 	[VCS3] = {
 		.hw_id = VCS3_HW,
@@ -147,7 +142,6 @@  static const struct engine_info intel_engines[] = {
 		.mmio_bases = {
 			{ .gen = 11, .base = GEN11_BSD3_RING_BASE }
 		},
-		.irq_shift = 0, /* not used */
 	},
 	[VCS4] = {
 		.hw_id = VCS4_HW,
@@ -157,7 +151,6 @@  static const struct engine_info intel_engines[] = {
 		.mmio_bases = {
 			{ .gen = 11, .base = GEN11_BSD4_RING_BASE }
 		},
-		.irq_shift = 0, /* not used */
 	},
 	[VECS] = {
 		.hw_id = VECS_HW,
@@ -168,7 +161,6 @@  static const struct engine_info intel_engines[] = {
 			{ .gen = 11, .base = GEN11_VEBOX_RING_BASE },
 			{ .gen = 7, .base = VEBOX_RING_BASE }
 		},
-		.irq_shift = GEN8_VECS_IRQ_SHIFT,
 	},
 	[VECS2] = {
 		.hw_id = VECS2_HW,
@@ -178,7 +170,6 @@  static const struct engine_info intel_engines[] = {
 		.mmio_bases = {
 			{ .gen = 11, .base = GEN11_VEBOX2_RING_BASE }
 		},
-		.irq_shift = 0, /* not used */
 	},
 };
 
@@ -301,7 +292,6 @@  intel_engine_setup(struct drm_i915_private *dev_priv,
 	__sprint_engine_name(engine->name, info);
 	engine->hw_id = engine->guc_id = info->hw_id;
 	engine->mmio_base = __engine_mmio_base(dev_priv, info->mmio_bases);
-	engine->irq_shift = info->irq_shift;
 	engine->class = info->class;
 	engine->instance = info->instance;
 
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 5e8f6896d059..aa1587c213aa 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2118,7 +2118,19 @@  logical_ring_default_vfuncs(struct intel_engine_cs *engine)
 static inline void
 logical_ring_default_irqs(struct intel_engine_cs *engine)
 {
-	unsigned shift = engine->irq_shift;
+	/* irq shifts for gen 8-10 */
+	const unsigned int irq_shifts[] = {
+		[RCS] = GEN8_RCS_IRQ_SHIFT,
+		[BCS] = GEN8_BCS_IRQ_SHIFT,
+		[VCS] = GEN8_VCS1_IRQ_SHIFT,
+		[VCS2] = GEN8_VCS2_IRQ_SHIFT,
+		[VECS] = GEN8_VECS_IRQ_SHIFT,
+	};
+	unsigned shift = 0;
+
+	if (INTEL_GEN(engine->i915) < 11)
+		shift = irq_shifts[engine->id];
+
 	engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
 	engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
 }
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3b478769a8c1..72d6167c519a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1944,8 +1944,6 @@  static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
 static void intel_ring_init_irq(struct drm_i915_private *dev_priv,
 				struct intel_engine_cs *engine)
 {
-	engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << engine->irq_shift;
-
 	if (INTEL_GEN(dev_priv) >= 6) {
 		engine->irq_enable = gen6_irq_enable;
 		engine->irq_disable = gen6_irq_disable;
@@ -2030,6 +2028,8 @@  int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
 	if (HAS_L3_DPF(dev_priv))
 		engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
 
+	engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
+
 	if (INTEL_GEN(dev_priv) >= 6) {
 		engine->init_context = intel_rcs_ctx_init;
 		engine->emit_flush = gen7_render_ring_flush;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index c31258d27e20..719ed05c7ad2 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -331,7 +331,6 @@  struct intel_engine_cs {
 	u8 instance;
 	u32 context_size;
 	u32 mmio_base;
-	unsigned int irq_shift;
 
 	struct intel_ring *buffer;
 	struct intel_timeline *timeline;