From 17be812e76eee0fc46747ce3ef87eab39f9d565c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 25 Apr 2022 20:53:16 +0530 Subject: [PATCH] drm/i915/selftests: Skip poisoning SET_PREDICATE_RESULT on dg2 When predication is enabled all commands baring a few (such as MI_BB_END) are nop'ed. If we accidentally enable predication while poisoning the context, not only is the rest of the poisoning skipped (thus disabling the test), but the closing instructions of the poison request are nop'ed. Not only do we then not signal the waiting context, but we even prevent re-enabling arbitration and the GPU will not perform a context switch at the end of the request. Cc: Joonas Lahtinen Suggested-by: CQ Tang Signed-off-by: Chris Wilson Signed-off-by: Ramalingam C Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20220425152317.4275-3-ramalingam.c@intel.com --- drivers/gpu/drm/i915/gt/intel_engine_regs.h | 1 + drivers/gpu/drm/i915/gt/selftest_lrc.c | 17 ++++++++++++++++- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_regs.h b/drivers/gpu/drm/i915/gt/intel_engine_regs.h index 594a629..1dab554 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_regs.h @@ -193,6 +193,7 @@ #define RING_TIMESTAMP_UDW(base) _MMIO((base) + 0x358 + 4) #define RING_CONTEXT_STATUS_PTR(base) _MMIO((base) + 0x3a0) #define RING_CTX_TIMESTAMP(base) _MMIO((base) + 0x3a8) /* gen8+ */ +#define RING_PREDICATE_RESULT(base) _MMIO((base) + 0x3b8) #define RING_FORCE_TO_NONPRIV(base, i) _MMIO(((base) + 0x4D0) + (i) * 4) #define RING_FORCE_TO_NONPRIV_ADDRESS_MASK REG_GENMASK(25, 2) #define RING_FORCE_TO_NONPRIV_ACCESS_RW (0 << 28) /* CFL+ & Gen11+ */ diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c index 8dc7b88..8b2c11d 100644 --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c @@ -945,6 +945,19 @@ create_user_vma(struct i915_address_space *vm, unsigned long size) return vma; } +static u32 safe_poison(u32 offset, u32 poison) +{ + /* + * Do not enable predication as it will nop all subsequent commands, + * not only disabling the tests (by preventing all the other SRM) but + * also preventing the arbitration events at the end of the request. + */ + if (offset == i915_mmio_reg_offset(RING_PREDICATE_RESULT(0))) + poison &= ~REG_BIT(0); + + return poison; +} + static struct i915_vma * store_context(struct intel_context *ce, struct i915_vma *scratch) { @@ -1154,7 +1167,9 @@ static struct i915_vma *load_context(struct intel_context *ce, u32 poison) *cs++ = MI_LOAD_REGISTER_IMM(len); while (len--) { *cs++ = hw[dw]; - *cs++ = poison; + *cs++ = safe_poison(hw[dw] & get_lri_mask(ce->engine, + MI_LRI_LRM_CS_MMIO), + poison); dw += 2; } } while (dw < PAGE_SIZE / sizeof(u32) && -- 2.7.4