On 17.02.2023 19:54, Matt Roper wrote:
MTL's primary GT can continue to use the same engine TLB invalidation
programming as past Xe_HP-based platforms. However the media GT needs
some special handling:
* Invalidation registers on the media GT are singleton registers
(unlike the primary GT where they are still MCR).
* Since the GSC is now exposed as an engine, there's a new register to
use for TLB invalidation. The offset is identical to the compute
engine offset, but this is expected --- compute engines only exist on
the primary GT while the GSC only exists on the media GT.
* Although there's only a single GSC engine instance, it inexplicably
uses bit 1 to request invalidations rather than bit 0.
Cc: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
---
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 52 ++++++++++++++++-------
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 +
2 files changed, 38 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index f3a91e7f85f7..af8e158fbd84 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1166,6 +1166,11 @@ static int intel_engine_init_tlb_invalidation(struct
intel_engine_cs *engine)
[COPY_ENGINE_CLASS].mcr_reg = XEHP_BLT_TLB_INV_CR,
[COMPUTE_CLASS].mcr_reg = XEHP_COMPCTX_TLB_INV_CR,
};
+ static const union intel_engine_tlb_inv_reg xelpmp_regs[] = {
+ [VIDEO_DECODE_CLASS].reg = GEN12_VD_TLB_INV_CR,
+ [VIDEO_ENHANCEMENT_CLASS].reg = GEN12_VE_TLB_INV_CR,
+ [OTHER_CLASS].reg = XELPMP_GSC_TLB_INV_CR,
+ };
struct drm_i915_private *i915 = engine->i915;
const unsigned int instance = engine->instance;
const unsigned int class = engine->class;
@@ -1185,19 +1190,28 @@ static int intel_engine_init_tlb_invalidation(struct
intel_engine_cs *engine)
* 12.00 -> 12.50 transition multi cast handling is required too.
*/
- if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 50) ||
- GRAPHICS_VER_FULL(i915) == IP_VER(12, 55)) {
- regs = xehp_regs;
- num = ARRAY_SIZE(xehp_regs);
- } else if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 0) ||
- GRAPHICS_VER_FULL(i915) == IP_VER(12, 10)) {
- regs = gen12_regs;
- num = ARRAY_SIZE(gen12_regs);
- } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11) {
- regs = gen8_regs;
- num = ARRAY_SIZE(gen8_regs);
- } else if (GRAPHICS_VER(i915) < 8) {
- return 0;
+ if (engine->gt->type == GT_MEDIA) {
+ if (MEDIA_VER_FULL(i915) == IP_VER(13, 0)) {
+ regs = xelpmp_regs;
+ num = ARRAY_SIZE(xelpmp_regs);
+ }
As I understand currently only GEN13 of media can have GT_MEDIA, so
fallback to gt_WARN_ONCE below is expected behavior.
+ } else {
+ if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 71) ||
12.71 is not yet present in i915_pci.c, maybe they should be added
together, up to you.
+ GRAPHICS_VER_FULL(i915) == IP_VER(12, 70) > +
GRAPHICS_VER_FULL(i915) == IP_VER(12, 50) ||
+ GRAPHICS_VER_FULL(i915) == IP_VER(12, 55)) {
+ regs = xehp_regs;
+ num = ARRAY_SIZE(xehp_regs);
+ } else if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 0) ||
+ GRAPHICS_VER_FULL(i915) == IP_VER(12, 10)) {
+ regs = gen12_regs;
+ num = ARRAY_SIZE(gen12_regs);
+ } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11)
{
+ regs = gen8_regs;
+ num = ARRAY_SIZE(gen8_regs);
+ } else if (GRAPHICS_VER(i915) < 8) {
+ return 0;
+ }
}
if (gt_WARN_ONCE(engine->gt, !num,
@@ -1212,7 +1226,14 @@ static int intel_engine_init_tlb_invalidation(struct
intel_engine_cs *engine)
reg = regs[class];
- if (regs == gen8_regs && class == VIDEO_DECODE_CLASS && instance == 1) {
+ if (class == OTHER_CLASS) {
Maybe it would be safer:
if (regs == xelpmp_regs && class == OTHER_CLASS)
+ /*
+ * There's only a single GSC instance, but it uses register bit
+ * 1 instead of either 0 or OTHER_GSC_INSTANCE.
+ */
+ GEM_WARN_ON(instance != OTHER_GSC_INSTANCE);
+ val = 1;
+ } else if (regs == gen8_regs && class == VIDEO_DECODE_CLASS && instance
== 1) {
reg.reg = GEN8_M2TCR;
val = 0;
} else {
@@ -1228,7 +1249,8 @@ static int intel_engine_init_tlb_invalidation(struct
intel_engine_cs *engine)
if (GRAPHICS_VER(i915) >= 12 &&
(engine->class == VIDEO_DECODE_CLASS ||
engine->class == VIDEO_ENHANCEMENT_CLASS ||
- engine->class == COMPUTE_CLASS))
+ engine->class == COMPUTE_CLASS ||
+ engine->class == OTHER_CLASS))
This is little surprise, I would expect non-masked reg for single
instance, but it follows bspec, so OK.
Reviewed-by: Andrzej Hajda <andrzej.ha...@intel.com>
Regards
Andrzej
engine->tlb_inv.request = _MASKED_BIT_ENABLE(val);
else
engine->tlb_inv.request = val;
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 416976d396ba..423e3e9c564b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1090,6 +1090,7 @@
#define XEHP_BLT_TLB_INV_CR MCR_REG(0xcee4)
#define GEN12_COMPCTX_TLB_INV_CR _MMIO(0xcf04)
#define XEHP_COMPCTX_TLB_INV_CR MCR_REG(0xcf04)
+#define XELPMP_GSC_TLB_INV_CR _MMIO(0xcf04) /* media GT
only */
#define XEHP_MERT_MOD_CTRL MCR_REG(0xcf28)
#define RENDER_MOD_CTRL MCR_REG(0xcf2c)
