From: Arun Siluvery Date: Fri, 19 Jun 2015 17:37:13 +0000 (+0100) Subject: drm/i915/gen8: Add WaFlushCoherentL3CacheLinesAtContextSwitch workaround X-Git-Tag: Ubuntu-5.2.0-15.16~10712^2~36^2~234 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=c82435bbe5aca62fc54615ff8ba78134bfa33866;p=mirror_ubuntu-eoan-kernel.git drm/i915/gen8: Add WaFlushCoherentL3CacheLinesAtContextSwitch workaround In Indirect context w/a batch buffer, +WaFlushCoherentL3CacheLinesAtContextSwitch:bdw v2: Add LRI commands to set/reset bit that invalidates coherent lines, update WA to include programming restrictions and exclude CHV as it is not required (Ville) v3: Avoid unnecessary read when it can be done by reading register once (Chris). Cc: Chris Wilson Cc: Dave Gordon Signed-off-by: Rafael Barbalho Signed-off-by: Arun Siluvery Acked-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 64caa470f2c6..b8e2259fe9ee 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -431,6 +431,7 @@ #define PIPE_CONTROL_INDIRECT_STATE_DISABLE (1<<9) #define PIPE_CONTROL_NOTIFY (1<<8) #define PIPE_CONTROL_FLUSH_ENABLE (1<<7) /* gen7+ */ +#define PIPE_CONTROL_DC_FLUSH_ENABLE (1<<5) #define PIPE_CONTROL_VF_CACHE_INVALIDATE (1<<4) #define PIPE_CONTROL_CONST_CACHE_INVALIDATE (1<<3) #define PIPE_CONTROL_STATE_CACHE_INVALIDATE (1<<2) @@ -5811,6 +5812,7 @@ enum skl_disp_power_wells { #define GEN8_L3SQCREG4 0xb118 #define GEN8_LQSC_RO_PERF_DIS (1<<27) +#define GEN8_LQSC_FLUSH_COHERENT_LINES (1<<21) /* GEN8 chicken */ #define HDC_CHICKEN0 0x7300 diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index a1198baf34aa..2b65d29c4801 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1143,6 +1143,29 @@ static int gen8_init_indirectctx_bb(struct intel_engine_cs *ring, /* WaDisableCtxRestoreArbitration:bdw,chv */ wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_DISABLE); + /* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */ + if (IS_BROADWELL(ring->dev)) { + struct drm_i915_private *dev_priv = to_i915(ring->dev); + uint32_t l3sqc4_flush = (I915_READ(GEN8_L3SQCREG4) | + GEN8_LQSC_FLUSH_COHERENT_LINES); + + wa_ctx_emit(batch, MI_LOAD_REGISTER_IMM(1)); + wa_ctx_emit(batch, GEN8_L3SQCREG4); + wa_ctx_emit(batch, l3sqc4_flush); + + wa_ctx_emit(batch, GFX_OP_PIPE_CONTROL(6)); + wa_ctx_emit(batch, (PIPE_CONTROL_CS_STALL | + PIPE_CONTROL_DC_FLUSH_ENABLE)); + wa_ctx_emit(batch, 0); + wa_ctx_emit(batch, 0); + wa_ctx_emit(batch, 0); + wa_ctx_emit(batch, 0); + + wa_ctx_emit(batch, MI_LOAD_REGISTER_IMM(1)); + wa_ctx_emit(batch, GEN8_L3SQCREG4); + wa_ctx_emit(batch, l3sqc4_flush & ~GEN8_LQSC_FLUSH_COHERENT_LINES); + } + /* Pad to end of cacheline */ while (index % CACHELINE_DWORDS) wa_ctx_emit(batch, MI_NOOP);