From: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Apply WABB blit for Wa_16018031267 / Wa_16018063123.
Additionally, update the lrc selftest to exercise the new
WABB changes.
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@xxxxxxxxx>
Co-developed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_engine_regs.h | 3 +
drivers/gpu/drm/i915/gt/intel_gt_types.h | 3 +
drivers/gpu/drm/i915/gt/intel_lrc.c | 114 +++++++++++++++++++-
drivers/gpu/drm/i915/gt/selftest_lrc.c | 65 +++++++----
drivers/gpu/drm/i915/i915_drv.h | 5 +
5 files changed, 169 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_regs.h b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
index 6b9d9f837669..2e06bea73297 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
@@ -118,6 +118,9 @@
#define CCID_EXTENDED_STATE_RESTORE BIT(2)
#define CCID_EXTENDED_STATE_SAVE BIT(3)
#define RING_BB_PER_CTX_PTR(base) _MMIO((base) + 0x1c0) /* gen8+ */
+#define PER_CTX_BB_FORCE BIT(2)
+#define PER_CTX_BB_VALID BIT(0)
+
#define RING_INDIRECT_CTX(base) _MMIO((base) + 0x1c4) /* gen8+ */
#define RING_INDIRECT_CTX_OFFSET(base) _MMIO((base) + 0x1c8) /* gen8+ */
#define ECOSKPD(base) _MMIO((base) + 0x1d0)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index def7dd0eb6f1..81989659ff78 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -307,6 +307,9 @@ enum intel_gt_scratch_field {
/* 8 bytes */
INTEL_GT_SCRATCH_FIELD_COHERENTL3_WA = 256,
+
+ /* 8 bytes */
+ INTEL_GT_SCRATCH_FIELD_DUMMY_BLIT = 384,
};
#define intel_gt_support_legacy_fencing(gt) ((gt)->ggtt->num_fences > 0)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 967fe4d77a87..444ad1977b10 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -828,6 +828,18 @@ lrc_ring_indirect_offset_default(const struct intel_engine_cs *engine)
return 0;
}
+static void
+lrc_setup_bb_per_ctx(u32 *regs,
+ const struct intel_engine_cs *engine,
+ u32 ctx_bb_ggtt_addr)
+{
+ GEM_BUG_ON(lrc_ring_wa_bb_per_ctx(engine) == -1);
+ regs[lrc_ring_wa_bb_per_ctx(engine) + 1] =
+ ctx_bb_ggtt_addr |
+ PER_CTX_BB_FORCE |
+ PER_CTX_BB_VALID;
+}
+
static void
lrc_setup_indirect_ctx(u32 *regs,
const struct intel_engine_cs *engine,
@@ -997,7 +1009,18 @@ static u32 context_wa_bb_offset(const struct intel_context *ce)
return PAGE_SIZE * ce->wa_bb_page;
}
-static u32 *context_indirect_bb(const struct intel_context *ce)
+/**
+ * context_wabb -
+ * Generates the location of the desired batch buffer used for workarounds
+ * @ce: The context used for the workaround.
+ * @per_ctx: When enabled, the function returns the location of
+ * the PER_CTX_BB. When disabled, the function returns
+ * the location of the INDIRECT_CTX.
+ *
+ * Returns: The location of the PER_CTX_BB or INDIRECT_CTX in the ce
+ * context, depending on if per_ctx is true or false, respectively.
+ */
+static u32 *context_wabb(const struct intel_context *ce, bool per_ctx)
{
void *ptr;
@@ -1006,6 +1029,7 @@ static u32 *context_indirect_bb(const struct intel_context *ce)
ptr = ce->lrc_reg_state;
ptr -= LRC_STATE_OFFSET; /* back to start of context image */
ptr += context_wa_bb_offset(ce);
+ ptr += per_ctx ? PAGE_SIZE : 0;
return ptr;
}
@@ -1082,7 +1106,8 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
if (GRAPHICS_VER(engine->i915) >= 12) {
ce->wa_bb_page = context_size / PAGE_SIZE;
- context_size += PAGE_SIZE;
+ /* INDIRECT_CTX and PER_CTX_BB need separate pages. */
+ context_size += PAGE_SIZE * 2;
}
if (intel_context_is_parent(ce) && intel_engine_uses_guc(engine)) {
@@ -1370,12 +1395,94 @@ gen12_emit_indirect_ctx_xcs(const struct intel_context *ce, u32 *cs)
return gen12_emit_aux_table_inv(ce->engine, cs);
}
+static u32 *xehp_emit_fastcolor_blt_wabb(const struct intel_context *ce, u32 *cs)
+{
+ struct intel_gt *gt = ce->engine->gt;
+ int mocs = gt->mocs.uc_index << 1;
+ u32 addr = intel_gt_scratch_offset(gt, INTEL_GT_SCRATCH_FIELD_DUMMY_BLIT);
+
+ /**
+ * Wa_16018031267 / Wa_16018063123 requires that SW forces the
+ * main copy engine arbitration into round robin mode. We
+ * additionally need to submit the following WABB blt command
+ * to produce 4 subblits with each subblit generating 0 byte
+ * write requests as WABB:
+ *
+ * XY_FASTCOLOR_BLT
+ * BG0 -> 5100000E
+ * BG1 -> 0000003F (Dest pitch)
+ * BG2 -> 00000000 (X1, Y1) = (0, 0)
+ * BG3 -> 00040001 (X2, Y2) = (1, 4)
+ * BG4 -> scratch
+ * BG5 -> scratch
+ * BG6-12 -> 00000000
+ * BG13 -> 20004004 (Surf. Width= 2,Surf. Height = 5 )
+ * BG14 -> 00000010 (Qpitch = 4)
+ * BG15 -> 00000000
+ */
+ *cs++ = XY_FAST_COLOR_BLT_CMD | (16 - 2);
+ *cs++ = FIELD_PREP(XY_FAST_COLOR_BLT_MOCS_MASK, mocs) | 0x3f;
+ *cs++ = 0;
+ *cs++ = 4 << 16 | 1;
+ *cs++ = addr;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0;
+ *cs++ = 0x20004004;
+ *cs++ = 0x10;
+ *cs++ = 0;
+
+ *cs++ = MI_BATCH_BUFFER_END;
+
+ return cs;
+}
+
+static u32 *
+xehp_emit_per_ctx_bb(const struct intel_context *ce, u32 *cs)
+{
+ /* Wa_16018031267, Wa_16018063123 */
+ if (ce->engine->class == COPY_ENGINE_CLASS &&
+ NEEDS_FASTCOLOR_BLT_WABB(ce->engine->i915))
+ cs = xehp_emit_fastcolor_blt_wabb(ce, cs);
+
+ return cs;
+}
+
+
+static void
+setup_per_ctx_bb(const struct intel_context *ce,
+ const struct intel_engine_cs *engine,
+ u32 *(*emit)(const struct intel_context *, u32 *))
+{
+ /* Place PER_CTX_BB on next page after INDIRECT_CTX */
+ u32 * const start = context_wabb(ce, true);
+ u32 *cs;
+
+ cs = emit(ce, start);
+
+ /* Skip PER_CTX_BB setup when not needed. */
+ if (cs == start)
+ return;
+
+ GEM_BUG_ON(cs - start > I915_GTT_PAGE_SIZE / sizeof(*cs));
+ while ((unsigned long)cs % CACHELINE_BYTES)
+ *cs++ = MI_NOOP;
+
+ lrc_setup_bb_per_ctx(ce->lrc_reg_state, engine,
+ lrc_indirect_bb(ce) + PAGE_SIZE / sizeof(*cs));
+}
+
static void
setup_indirect_ctx_bb(const struct intel_context *ce,
const struct intel_engine_cs *engine,
u32 *(*emit)(const struct intel_context *, u32 *))
{
- u32 * const start = context_indirect_bb(ce);
+ u32 * const start = context_wabb(ce, false);
u32 *cs;
cs = emit(ce, start);
@@ -1474,6 +1581,7 @@ u32 lrc_update_regs(const struct intel_context *ce,
/* Mutually exclusive wrt to global indirect bb */
GEM_BUG_ON(engine->wa_ctx.indirect_ctx.size);
setup_indirect_ctx_bb(ce, engine, fn);
+ setup_per_ctx_bb(ce, engine, xehp_emit_per_ctx_bb);
}
return lrc_descriptor(ce) | CTX_DESC_FORCE_RESTORE;
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 5f826b6dcf5d..f1dce05bbfb7 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -1555,7 +1555,7 @@ static int live_lrc_isolation(void *arg)
return err;
}
-static int indirect_ctx_submit_req(struct intel_context *ce)
+static int wabb_ctx_submit_req(struct intel_context *ce)
{
struct i915_request *rq;
int err = 0;
@@ -1579,7 +1579,8 @@ static int indirect_ctx_submit_req(struct intel_context *ce)
#define CTX_BB_CANARY_INDEX (CTX_BB_CANARY_OFFSET / sizeof(u32))
static u32 *
-emit_indirect_ctx_bb_canary(const struct intel_context *ce, u32 *cs)
+emit_wabb_ctx_canary(const struct intel_context *ce,
+ u32 *cs, bool per_ctx)
{
*cs++ = MI_STORE_REGISTER_MEM_GEN8 |
MI_SRM_LRM_GLOBAL_GTT |
@@ -1587,26 +1588,43 @@ emit_indirect_ctx_bb_canary(const struct intel_context *ce, u32 *cs)
*cs++ = i915_mmio_reg_offset(RING_START(0));
*cs++ = i915_ggtt_offset(ce->state) +
context_wa_bb_offset(ce) +
- CTX_BB_CANARY_OFFSET;
+ CTX_BB_CANARY_OFFSET +
+ (per_ctx ? PAGE_SIZE : 0);
*cs++ = 0;
return cs;
}
+static u32 *
+emit_indirect_ctx_bb_canary(const struct intel_context *ce, u32 *cs)
+{
+ return emit_wabb_ctx_canary(ce, cs, false);
+}
+
+static u32 *
+emit_per_ctx_bb_canary(const struct intel_context *ce, u32 *cs)
+{
+ return emit_wabb_ctx_canary(ce, cs, true);
+}
+
static void
-indirect_ctx_bb_setup(struct intel_context *ce)
+wabb_ctx_setup(struct intel_context *ce, bool per_ctx)
{
- u32 *cs = context_indirect_bb(ce);
+ u32 *cs = context_wabb(ce, per_ctx);
cs[CTX_BB_CANARY_INDEX] = 0xdeadf00d;
- setup_indirect_ctx_bb(ce, ce->engine, emit_indirect_ctx_bb_canary);
+ if (per_ctx)
+ setup_per_ctx_bb(ce, ce->engine, emit_per_ctx_bb_canary);
+ else
+ setup_indirect_ctx_bb(ce, ce->engine, emit_indirect_ctx_bb_canary);
}
-static bool check_ring_start(struct intel_context *ce)
+static bool check_ring_start(struct intel_context *ce, bool per_ctx)
{
const u32 * const ctx_bb = (void *)(ce->lrc_reg_state) -
- LRC_STATE_OFFSET + context_wa_bb_offset(ce);
+ LRC_STATE_OFFSET + context_wa_bb_offset(ce) +
+ (per_ctx ? PAGE_SIZE / sizeof(u32) : 0);
if (ctx_bb[CTX_BB_CANARY_INDEX] == ce->lrc_reg_state[CTX_RING_START])
return true;
@@ -1618,21 +1636,21 @@ static bool check_ring_start(struct intel_context *ce)
return false;
}
-static int indirect_ctx_bb_check(struct intel_context *ce)
+static int wabb_ctx_check(struct intel_context *ce, bool per_ctx)
{
int err;
- err = indirect_ctx_submit_req(ce);
+ err = wabb_ctx_submit_req(ce);
if (err)
return err;
- if (!check_ring_start(ce))
+ if (!check_ring_start(ce, per_ctx))
return -EINVAL;
return 0;
}
-static int __live_lrc_indirect_ctx_bb(struct intel_engine_cs *engine)
+static int __lrc_wabb_ctx(struct intel_engine_cs *engine, bool per_ctx)
{
struct intel_context *a, *b;
int err;
@@ -1667,14 +1685,14 @@ static int __live_lrc_indirect_ctx_bb(struct intel_engine_cs *engine)
* As ring start is restored apriori of starting the indirect ctx bb and
* as it will be different for each context, it fits to this purpose.
*/
- indirect_ctx_bb_setup(a);
- indirect_ctx_bb_setup(b);
+ wabb_ctx_setup(a, per_ctx);
+ wabb_ctx_setup(b, per_ctx);
- err = indirect_ctx_bb_check(a);
+ err = wabb_ctx_check(a, per_ctx);
if (err)
goto unpin_b;
- err = indirect_ctx_bb_check(b);
+ err = wabb_ctx_check(b, per_ctx);
unpin_b:
intel_context_unpin(b);
@@ -1688,7 +1706,7 @@ static int __live_lrc_indirect_ctx_bb(struct intel_engine_cs *engine)
return err;
}
-static int live_lrc_indirect_ctx_bb(void *arg)
+static int lrc_wabb_ctx(void *arg, bool per_ctx)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
@@ -1697,7 +1715,7 @@ static int live_lrc_indirect_ctx_bb(void *arg)
for_each_engine(engine, gt, id) {
intel_engine_pm_get(engine);
- err = __live_lrc_indirect_ctx_bb(engine);
+ err = __lrc_wabb_ctx(engine, per_ctx);
intel_engine_pm_put(engine);
if (igt_flush_test(gt->i915))
@@ -1710,6 +1728,16 @@ static int live_lrc_indirect_ctx_bb(void *arg)
return err;
}
+static int live_lrc_indirect_ctx_bb(void *arg)
+{
+ return lrc_wabb_ctx(arg, false);
+}
+
+static int live_lrc_per_ctx_bb(void *arg)
+{
+ return lrc_wabb_ctx(arg, true);
+}
+
static void garbage_reset(struct intel_engine_cs *engine,
struct i915_request *rq)
{
@@ -1947,6 +1975,7 @@ int intel_lrc_live_selftests(struct drm_i915_private *i915)
SUBTEST(live_lrc_garbage),
SUBTEST(live_pphwsp_runtime),
SUBTEST(live_lrc_indirect_ctx_bb),
+ SUBTEST(live_lrc_per_ctx_bb),
};
if (!HAS_LOGICAL_RING_CONTEXTS(i915))
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 87ffc477c3b1..15b54b3beaa5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -813,4 +813,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
#define HAS_LMEMBAR_SMEM_STOLEN(i915) (!HAS_LMEM(i915) && \
GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
+#define NEEDS_FASTCOLOR_BLT_WABB(i915) (GRAPHICS_VER_FULL(i915) == IP_VER(12, 70) || \
+ GRAPHICS_VER_FULL(i915) == IP_VER(12, 71) || \
+ IS_PONTEVECCHIO(i915) || \
+ IS_DG2(i915))
+
#endif
--
2.25.1
