[PATCH 2/2] drm/i915: kill resource streamer

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After disabling resource streamer on ICL (due to it actually not
existing there), I got feedback that there have been some experimental
patches for mesa to use it, but nothing ever landed nor shipped.

This is a tentative to remove it from kernel keeping the uapi defines
around for compatibility. We may need to keep CTX_CTRL_RS_CTX_ENABLE on
some platforms - Daniele mentioned there's possible performance regression
in gem_latency if this bit is not set. On this patch, I'm just removing
it in order to get proper numbers.

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.c            |  2 +-
 drivers/gpu/drm/i915/i915_drv.h            |  2 --
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 15 ++-------------
 drivers/gpu/drm/i915/i915_pci.c            |  4 ----
 drivers/gpu/drm/i915/intel_device_info.h   |  1 -
 drivers/gpu/drm/i915/intel_lrc.c           |  8 ++------
 drivers/gpu/drm/i915/intel_ringbuffer.c    |  4 +---
 drivers/gpu/drm/i915/intel_ringbuffer.h    |  1 -
 include/uapi/drm/i915_drm.h                |  1 +
 tools/include/uapi/drm/i915_drm.h          |  1 +
 10 files changed, 8 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0db3c83cce29..6715e37ee66b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -370,7 +370,7 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data,
 			value = 2;
 		break;
 	case I915_PARAM_HAS_RESOURCE_STREAMER:
-		value = HAS_RESOURCE_STREAMER(dev_priv);
+		value = 0;
 		break;
 	case I915_PARAM_HAS_POOLED_EU:
 		value = HAS_POOLED_EU(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bec0a2796c37..bd69e4b120a8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2609,8 +2609,6 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define USES_GUC_SUBMISSION(dev_priv)	intel_uc_is_using_guc_submission()
 #define USES_HUC(dev_priv)		intel_uc_is_using_huc()
 
-#define HAS_RESOURCE_STREAMER(dev_priv) ((dev_priv)->info.has_resource_streamer)
-
 #define HAS_POOLED_EU(dev_priv)	((dev_priv)->info.has_pooled_eu)
 
 #define INTEL_PCH_DEVICE_ID_MASK		0xff80
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1932bc227942..a5eec97a40fe 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -2221,19 +2221,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	if (!eb.engine)
 		return -EINVAL;
 
-	if (args->flags & I915_EXEC_RESOURCE_STREAMER) {
-		if (!HAS_RESOURCE_STREAMER(eb.i915)) {
-			DRM_DEBUG("RS is only allowed for Haswell and Gen8 - Gen10\n");
-			return -EINVAL;
-		}
-		if (eb.engine->id != RCS) {
-			DRM_DEBUG("RS is not available on %s\n",
-				 eb.engine->name);
-			return -EINVAL;
-		}
-
-		eb.batch_flags |= I915_DISPATCH_RS;
-	}
+	if (args->flags & I915_EXEC_RESOURCE_STREAMER)
+		DRM_DEBUG("RS is removed from all Gens: ignoring.\n");
 
 	if (args->flags & I915_EXEC_FENCE_IN) {
 		in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2));
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index c03ba0fe0845..7af19097dce8 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -360,7 +360,6 @@ static const struct intel_device_info intel_valleyview_info = {
 	.has_ddi = 1, \
 	.has_fpga_dbg = 1, \
 	.has_psr = 1, \
-	.has_resource_streamer = 1, \
 	.has_dp_mst = 1, \
 	.has_rc6p = 0 /* RC6p removed-by HSW */, \
 	.has_runtime_pm = 1
@@ -433,7 +432,6 @@ static const struct intel_device_info intel_cherryview_info = {
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
 	.has_64bit_reloc = 1,
 	.has_runtime_pm = 1,
-	.has_resource_streamer = 1,
 	.has_rc6 = 1,
 	.has_logical_ring_contexts = 1,
 	.has_gmch_display = 1,
@@ -506,7 +504,6 @@ static const struct intel_device_info intel_skylake_gt4_info = {
 	.has_runtime_pm = 1, \
 	.has_pooled_eu = 0, \
 	.has_csr = 1, \
-	.has_resource_streamer = 1, \
 	.has_rc6 = 1, \
 	.has_dp_mst = 1, \
 	.has_logical_ring_contexts = 1, \
@@ -593,7 +590,6 @@ static const struct intel_device_info intel_cannonlake_info = {
 	GEN(11), \
 	.ddb_size = 2048, \
 	.has_csr = 0, \
-	.has_resource_streamer = 0, \
 	.has_logical_ring_elsq = 1
 
 static const struct intel_device_info intel_icelake_11_info = {
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 633f9fbf72ea..6814cc7dfcd3 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -103,7 +103,6 @@ enum intel_platform {
 	func(has_psr); \
 	func(has_rc6); \
 	func(has_rc6p); \
-	func(has_resource_streamer); \
 	func(has_runtime_pm); \
 	func(has_snoop); \
 	func(unfenced_needs_alignment); \
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ab89dabc2965..843a940bcc58 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2138,8 +2138,7 @@ static int gen8_emit_bb_start(struct i915_request *rq,
 
 	/* FIXME(BDW): Address space and security selectors. */
 	*cs++ = MI_BATCH_BUFFER_START_GEN8 |
-		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8)) |
-		(flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0);
+		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8));
 	*cs++ = lower_32_bits(offset);
 	*cs++ = upper_32_bits(offset);
 
@@ -2657,10 +2656,7 @@ static void execlists_init_reg_state(u32 *regs,
 
 	CTX_REG(regs, CTX_CONTEXT_CONTROL, RING_CONTEXT_CONTROL(engine),
 		_MASKED_BIT_DISABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
-				    CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT) |
-		_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
-				   (HAS_RESOURCE_STREAMER(dev_priv) ?
-				   CTX_CTRL_RS_CTX_ENABLE : 0)));
+				    CTX_CTRL_ENGINE_CTX_SAVE_INHIBIT));
 	CTX_REG(regs, CTX_RING_HEAD, RING_HEAD(base), 0);
 	CTX_REG(regs, CTX_RING_TAIL, RING_TAIL(base), 0);
 	CTX_REG(regs, CTX_RING_BUFFER_START, RING_START(base), 0);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 700f94c371b3..a76b974c398d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1979,9 +1979,7 @@ hsw_emit_bb_start(struct i915_request *rq,
 		return PTR_ERR(cs);
 
 	*cs++ = MI_BATCH_BUFFER_START | (dispatch_flags & I915_DISPATCH_SECURE ?
-		0 : MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW) |
-		(dispatch_flags & I915_DISPATCH_RS ?
-		MI_BATCH_RESOURCE_STREAMER : 0);
+		0 : MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW);
 	/* bit0-7 is the length on GEN6+ */
 	*cs++ = offset;
 	intel_ring_advance(rq, cs);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index ce6cc2a6cf7a..efec5b14ddb0 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -472,7 +472,6 @@ struct intel_engine_cs {
 					 unsigned int dispatch_flags);
 #define I915_DISPATCH_SECURE BIT(0)
 #define I915_DISPATCH_PINNED BIT(1)
-#define I915_DISPATCH_RS     BIT(2)
 	void		(*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
 	int		emit_breadcrumb_sz;
 
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 7f5634ce8e88..179e0477dbc6 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -449,6 +449,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_SUBSLICE_TOTAL	 33
 #define I915_PARAM_EU_TOTAL		 34
 #define I915_PARAM_HAS_GPU_RESET	 35
+/* Deprecated: do not use */
 #define I915_PARAM_HAS_RESOURCE_STREAMER 36
 #define I915_PARAM_HAS_EXEC_SOFTPIN	 37
 #define I915_PARAM_HAS_POOLED_EU	 38
diff --git a/tools/include/uapi/drm/i915_drm.h b/tools/include/uapi/drm/i915_drm.h
index 7f5634ce8e88..179e0477dbc6 100644
--- a/tools/include/uapi/drm/i915_drm.h
+++ b/tools/include/uapi/drm/i915_drm.h
@@ -449,6 +449,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_SUBSLICE_TOTAL	 33
 #define I915_PARAM_EU_TOTAL		 34
 #define I915_PARAM_HAS_GPU_RESET	 35
+/* Deprecated: do not use */
 #define I915_PARAM_HAS_RESOURCE_STREAMER 36
 #define I915_PARAM_HAS_EXEC_SOFTPIN	 37
 #define I915_PARAM_HAS_POOLED_EU	 38
-- 
2.17.1

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