drm/i915: kill resource streamer support

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 RS years ago, but nothing ever landed or shipped
because there was no performance improvement.

This removes it from kernel keeping the uapi defines around for
compatibility.

v2: - re-add the inadvertent removal of CTX_CTRL_INHIBIT_SYN_CTX_SWITCH
- don't bother trying to document removed params on uapi header:
applications should know that from the query.
(from Chris)

v3: - disable CTX_CTRL_RS_CTX_ENABLE istead of removing it
- reword commit message after Daniele confirmed no performance
regression on his machine
- reword commit message to make clear RS is being removed due to
never been used
v4: - move I915_EXEC_RESOURCE_STREAMER to __I915_EXEC_ILLEGAL_FLAGS so
the check on ioctl() is made much earlier by
i915_gem_check_execbuffer() (suggested by Tvrtko)

Signed-off-by: Lucas De Marchi <[e-mail]>
Acked-by: Daniele Ceraolo Spurio <[e-mail]>
Reviewed-by: Tvrtko Ursulin <[e-mail]>
Signed-off-by: Chris Wilson <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_drv.c

···
 			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);

drivers/gpu/drm/i915/i915_drv.h

···
 #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

drivers/gpu/drm/i915/i915_gem_execbuffer.c

···
 #define BATCH_OFFSET_BIAS (256*1024)
 
 #define __I915_EXEC_ILLEGAL_FLAGS \
-	(__I915_EXEC_UNKNOWN_FLAGS | I915_EXEC_CONSTANTS_MASK)
+	(__I915_EXEC_UNKNOWN_FLAGS | \
+	 I915_EXEC_CONSTANTS_MASK  | \
+	 I915_EXEC_RESOURCE_STREAMER)
 
 /* Catch emission of unexpected errors for CI! */
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
···
 	eb.engine = eb_select_engine(eb.i915, file, args);
 	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_FENCE_IN) {
 		in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2));

drivers/gpu/drm/i915/i915_pci.c

···
 	.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
···
 	.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,
···
 	.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, \
···
 	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 = {

drivers/gpu/drm/i915/intel_device_info.h

···
 	func(has_psr); \
 	func(has_rc6); \
 	func(has_rc6p); \
-	func(has_resource_streamer); \
 	func(has_runtime_pm); \
 	func(has_snoop); \
 	func(has_coherent_ggtt); \

drivers/gpu/drm/i915/intel_lrc.c

···
 
 	/* 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);
 
···
 
 	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_CTRL_RS_CTX_ENABLE) |
+		_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH));
 	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);

drivers/gpu/drm/i915/intel_ringbuffer.c

···
 		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);

drivers/gpu/drm/i915/intel_ringbuffer.h

···
 					 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;