1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/gen2_engine_cs.c b/drivers/gpu/drm/i915/gt/gen2_engine_cs.c
new file mode 100644
index 000000000..b491a6491
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen2_engine_cs.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "gen2_engine_cs.h"
+#include "i915_drv.h"
+#include "intel_engine.h"
+#include "intel_gpu_commands.h"
+#include "intel_gt.h"
+#include "intel_gt_irq.h"
+#include "intel_ring.h"
+
+int gen2_emit_flush(struct i915_request *rq, u32 mode)
+{
+	unsigned int num_store_dw = 12;
+	u32 cmd, *cs;
+
+	cmd = MI_FLUSH;
+	if (mode & EMIT_INVALIDATE)
+		cmd |= MI_READ_FLUSH;
+
+	cs = intel_ring_begin(rq, 2 + 4 * num_store_dw);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = cmd;
+	while (num_store_dw--) {
+		*cs++ = MI_STORE_DWORD_INDEX;
+		*cs++ = I915_GEM_HWS_SCRATCH * sizeof(u32);
+		*cs++ = 0;
+		*cs++ = MI_FLUSH | MI_NO_WRITE_FLUSH;
+	}
+	*cs++ = cmd;
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen4_emit_flush_rcs(struct i915_request *rq, u32 mode)
+{
+	u32 cmd, *cs;
+	int i;
+
+	/*
+	 * read/write caches:
+	 *
+	 * I915_GEM_DOMAIN_RENDER is always invalidated, but is
+	 * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is
+	 * also flushed at 2d versus 3d pipeline switches.
+	 *
+	 * read-only caches:
+	 *
+	 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
+	 * MI_READ_FLUSH is set, and is always flushed on 965.
+	 *
+	 * I915_GEM_DOMAIN_COMMAND may not exist?
+	 *
+	 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
+	 * invalidated when MI_EXE_FLUSH is set.
+	 *
+	 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
+	 * invalidated with every MI_FLUSH.
+	 *
+	 * TLBs:
+	 *
+	 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
+	 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
+	 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
+	 * are flushed at any MI_FLUSH.
+	 */
+
+	cmd = MI_FLUSH;
+	if (mode & EMIT_INVALIDATE) {
+		cmd |= MI_EXE_FLUSH;
+		if (IS_G4X(rq->engine->i915) || IS_GEN(rq->engine->i915, 5))
+			cmd |= MI_INVALIDATE_ISP;
+	}
+
+	i = 2;
+	if (mode & EMIT_INVALIDATE)
+		i += 20;
+
+	cs = intel_ring_begin(rq, i);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = cmd;
+
+	/*
+	 * A random delay to let the CS invalidate take effect? Without this
+	 * delay, the GPU relocation path fails as the CS does not see
+	 * the updated contents. Just as important, if we apply the flushes
+	 * to the EMIT_FLUSH branch (i.e. immediately after the relocation
+	 * write and before the invalidate on the next batch), the relocations
+	 * still fail. This implies that is a delay following invalidation
+	 * that is required to reset the caches as opposed to a delay to
+	 * ensure the memory is written.
+	 */
+	if (mode & EMIT_INVALIDATE) {
+		*cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
+		*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+						INTEL_GT_SCRATCH_FIELD_DEFAULT) |
+			PIPE_CONTROL_GLOBAL_GTT;
+		*cs++ = 0;
+		*cs++ = 0;
+
+		for (i = 0; i < 12; i++)
+			*cs++ = MI_FLUSH;
+
+		*cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
+		*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+						INTEL_GT_SCRATCH_FIELD_DEFAULT) |
+			PIPE_CONTROL_GLOBAL_GTT;
+		*cs++ = 0;
+		*cs++ = 0;
+	}
+
+	*cs++ = cmd;
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen4_emit_flush_vcs(struct i915_request *rq, u32 mode)
+{
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = MI_FLUSH;
+	*cs++ = MI_NOOP;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+static u32 *__gen2_emit_breadcrumb(struct i915_request *rq, u32 *cs,
+				   int flush, int post)
+{
+	GEM_BUG_ON(i915_request_active_timeline(rq)->hwsp_ggtt != rq->engine->status_page.vma);
+	GEM_BUG_ON(offset_in_page(i915_request_active_timeline(rq)->hwsp_offset) != I915_GEM_HWS_SEQNO_ADDR);
+
+	*cs++ = MI_FLUSH;
+
+	while (flush--) {
+		*cs++ = MI_STORE_DWORD_INDEX;
+		*cs++ = I915_GEM_HWS_SCRATCH * sizeof(u32);
+		*cs++ = rq->fence.seqno;
+	}
+
+	while (post--) {
+		*cs++ = MI_STORE_DWORD_INDEX;
+		*cs++ = I915_GEM_HWS_SEQNO_ADDR;
+		*cs++ = rq->fence.seqno;
+	}
+
+	*cs++ = MI_USER_INTERRUPT;
+
+	rq->tail = intel_ring_offset(rq, cs);
+	assert_ring_tail_valid(rq->ring, rq->tail);
+
+	return cs;
+}
+
+u32 *gen3_emit_breadcrumb(struct i915_request *rq, u32 *cs)
+{
+	return __gen2_emit_breadcrumb(rq, cs, 16, 8);
+}
+
+u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
+{
+	return __gen2_emit_breadcrumb(rq, cs, 8, 8);
+}
+
+/* Just userspace ABI convention to limit the wa batch bo to a resonable size */
+#define I830_BATCH_LIMIT SZ_256K
+#define I830_TLB_ENTRIES (2)
+#define I830_WA_SIZE max(I830_TLB_ENTRIES * SZ_4K, I830_BATCH_LIMIT)
+int i830_emit_bb_start(struct i915_request *rq,
+		       u64 offset, u32 len,
+		       unsigned int dispatch_flags)
+{
+	u32 *cs, cs_offset =
+		intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_DEFAULT);
+
+	GEM_BUG_ON(rq->engine->gt->scratch->size < I830_WA_SIZE);
+
+	cs = intel_ring_begin(rq, 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/* Evict the invalid PTE TLBs */
+	*cs++ = COLOR_BLT_CMD | BLT_WRITE_RGBA;
+	*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | 4096;
+	*cs++ = I830_TLB_ENTRIES << 16 | 4; /* load each page */
+	*cs++ = cs_offset;
+	*cs++ = 0xdeadbeef;
+	*cs++ = MI_NOOP;
+	intel_ring_advance(rq, cs);
+
+	if ((dispatch_flags & I915_DISPATCH_PINNED) == 0) {
+		if (len > I830_BATCH_LIMIT)
+			return -ENOSPC;
+
+		cs = intel_ring_begin(rq, 6 + 2);
+		if (IS_ERR(cs))
+			return PTR_ERR(cs);
+
+		/*
+		 * Blit the batch (which has now all relocs applied) to the
+		 * stable batch scratch bo area (so that the CS never
+		 * stumbles over its tlb invalidation bug) ...
+		 */
+		*cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | 4096;
+		*cs++ = DIV_ROUND_UP(len, 4096) << 16 | 4096;
+		*cs++ = cs_offset;
+		*cs++ = 4096;
+		*cs++ = offset;
+
+		*cs++ = MI_FLUSH;
+		*cs++ = MI_NOOP;
+		intel_ring_advance(rq, cs);
+
+		/* ... and execute it. */
+		offset = cs_offset;
+	}
+
+	if (!(dispatch_flags & I915_DISPATCH_SECURE))
+		offset |= MI_BATCH_NON_SECURE;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
+	*cs++ = offset;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen3_emit_bb_start(struct i915_request *rq,
+		       u64 offset, u32 len,
+		       unsigned int dispatch_flags)
+{
+	u32 *cs;
+
+	if (!(dispatch_flags & I915_DISPATCH_SECURE))
+		offset |= MI_BATCH_NON_SECURE;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
+	*cs++ = offset;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen4_emit_bb_start(struct i915_request *rq,
+		       u64 offset, u32 length,
+		       unsigned int dispatch_flags)
+{
+	u32 security;
+	u32 *cs;
+
+	security = MI_BATCH_NON_SECURE_I965;
+	if (dispatch_flags & I915_DISPATCH_SECURE)
+		security = 0;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT | security;
+	*cs++ = offset;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+void gen2_irq_enable(struct intel_engine_cs *engine)
+{
+	struct drm_i915_private *i915 = engine->i915;
+
+	i915->irq_mask &= ~engine->irq_enable_mask;
+	intel_uncore_write16(&i915->uncore, GEN2_IMR, i915->irq_mask);
+	ENGINE_POSTING_READ16(engine, RING_IMR);
+}
+
+void gen2_irq_disable(struct intel_engine_cs *engine)
+{
+	struct drm_i915_private *i915 = engine->i915;
+
+	i915->irq_mask |= engine->irq_enable_mask;
+	intel_uncore_write16(&i915->uncore, GEN2_IMR, i915->irq_mask);
+}
+
+void gen3_irq_enable(struct intel_engine_cs *engine)
+{
+	engine->i915->irq_mask &= ~engine->irq_enable_mask;
+	intel_uncore_write(engine->uncore, GEN2_IMR, engine->i915->irq_mask);
+	intel_uncore_posting_read_fw(engine->uncore, GEN2_IMR);
+}
+
+void gen3_irq_disable(struct intel_engine_cs *engine)
+{
+	engine->i915->irq_mask |= engine->irq_enable_mask;
+	intel_uncore_write(engine->uncore, GEN2_IMR, engine->i915->irq_mask);
+}
+
+void gen5_irq_enable(struct intel_engine_cs *engine)
+{
+	gen5_gt_enable_irq(engine->gt, engine->irq_enable_mask);
+}
+
+void gen5_irq_disable(struct intel_engine_cs *engine)
+{
+	gen5_gt_disable_irq(engine->gt, engine->irq_enable_mask);
+}