On Fri, Aug 22, 2014 at 08:39:11PM +0100, Arun Siluvery wrote:
> For BDW workarounds are currently initialized in init_clock_gating() but
> they are lost during reset, suspend/resume etc; this patch moves the WAs
> that are part of register state context to render ring init fn otherwise
> default context ends up with incorrect values as they don't get initialized
> until init_clock_gating fn.
>
> v2: Add workarounds to golden render state
> This method has its own issues, first of all this is different for
> each gen and it is generated using a tool so adding new workaround
> and mainitaining them across gens is not a straightforward process.
>
> v3: Use LRIs to emit these workarounds (Ville)
> Instead of modifying the golden render state the same LRIs are
> emitted from within the driver.
>
> For: VIZ-4092
> Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem_context.c | 6 +++
> drivers/gpu/drm/i915/intel_pm.c | 48 ----------------------
> drivers/gpu/drm/i915/intel_ringbuffer.c | 70 +++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_ringbuffer.h | 7 ++++
> 4 files changed, 83 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 9683e62..2debce4 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -631,20 +631,26 @@ static int do_switch(struct intel_engine_cs *ring,
> }
>
> uninitialized = !to->legacy_hw_ctx.initialized && from == NULL;
> to->legacy_hw_ctx.initialized = true;
>
> done:
> i915_gem_context_reference(to);
> ring->last_context = to;
>
> if (uninitialized) {
> + if (IS_BROADWELL(ring->dev)) {
> + ret = bdw_init_workarounds(ring);
> + if (ret)
> + DRM_ERROR("init workarounds: %d\n", ret);
> + }
> +
> ret = i915_gem_render_state_init(ring);
> if (ret)
> DRM_ERROR("init render state: %d\n", ret);
> }
>
> return 0;
>
> unpin_out:
> if (ring->id == RCS)
> i915_gem_object_ggtt_unpin(to->legacy_hw_ctx.rcs_state);
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index c8f744c..668acd9 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -5507,101 +5507,53 @@ static void gen8_init_clock_gating(struct drm_device *dev)
> struct drm_i915_private *dev_priv = dev->dev_private;
> enum pipe pipe;
>
> I915_WRITE(WM3_LP_ILK, 0);
> I915_WRITE(WM2_LP_ILK, 0);
> I915_WRITE(WM1_LP_ILK, 0);
>
> /* FIXME(BDW): Check all the w/a, some might only apply to
> * pre-production hw. */
>
> - /* WaDisablePartialInstShootdown:bdw */
> - I915_WRITE(GEN8_ROW_CHICKEN,
> - _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE));
> -
> - /* WaDisableThreadStallDopClockGating:bdw */
> - /* FIXME: Unclear whether we really need this on production bdw. */
> - I915_WRITE(GEN8_ROW_CHICKEN,
> - _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE));
>
> - /*
> - * This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for
> - * pre-production hardware
> - */
> - I915_WRITE(HALF_SLICE_CHICKEN3,
> - _MASKED_BIT_ENABLE(GEN8_CENTROID_PIXEL_OPT_DIS));
> - I915_WRITE(HALF_SLICE_CHICKEN3,
> - _MASKED_BIT_ENABLE(GEN8_SAMPLER_POWER_BYPASS_DIS));
> I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_BWGTLB_DISABLE));
>
> I915_WRITE(_3D_CHICKEN3,
> _MASKED_BIT_ENABLE(_3D_CHICKEN_SDE_LIMIT_FIFO_POLY_DEPTH(2)));
>
> - I915_WRITE(COMMON_SLICE_CHICKEN2,
> - _MASKED_BIT_ENABLE(GEN8_CSC2_SBE_VUE_CACHE_CONSERVATIVE));
> -
> - I915_WRITE(GEN7_HALF_SLICE_CHICKEN1,
> - _MASKED_BIT_ENABLE(GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE));
> -
> - /* WaDisableDopClockGating:bdw May not be needed for production */
> - I915_WRITE(GEN7_ROW_CHICKEN2,
> - _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
>
> /* WaSwitchSolVfFArbitrationPriority:bdw */
> I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
>
> /* WaPsrDPAMaskVBlankInSRD:bdw */
> I915_WRITE(CHICKEN_PAR1_1,
> I915_READ(CHICKEN_PAR1_1) | DPA_MASK_VBLANK_SRD);
>
> /* WaPsrDPRSUnmaskVBlankInSRD:bdw */
> for_each_pipe(pipe) {
> I915_WRITE(CHICKEN_PIPESL_1(pipe),
> I915_READ(CHICKEN_PIPESL_1(pipe)) |
> BDW_DPRS_MASK_VBLANK_SRD);
> }
>
> - /* Use Force Non-Coherent whenever executing a 3D context. This is a
> - * workaround for for a possible hang in the unlikely event a TLB
> - * invalidation occurs during a PSD flush.
> - */
> - I915_WRITE(HDC_CHICKEN0,
> - I915_READ(HDC_CHICKEN0) |
> - _MASKED_BIT_ENABLE(HDC_FORCE_NON_COHERENT));
> -
> /* WaVSRefCountFullforceMissDisable:bdw */
> /* WaDSRefCountFullforceMissDisable:bdw */
> I915_WRITE(GEN7_FF_THREAD_MODE,
> I915_READ(GEN7_FF_THREAD_MODE) &
> ~(GEN8_FF_DS_REF_CNT_FFME | GEN7_FF_VS_REF_CNT_FFME));
>
> - /*
> - * BSpec recommends 8x4 when MSAA is used,
> - * however in practice 16x4 seems fastest.
> - *
> - * Note that PS/WM thread counts depend on the WIZ hashing
> - * disable bit, which we don't touch here, but it's good
> - * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
> - */
> - I915_WRITE(GEN7_GT_MODE,
> - GEN6_WIZ_HASHING_MASK | GEN6_WIZ_HASHING_16x4);
> -
> I915_WRITE(GEN6_RC_SLEEP_PSMI_CONTROL,
> _MASKED_BIT_ENABLE(GEN8_RC_SEMA_IDLE_MSG_DISABLE));
>
> /* WaDisableSDEUnitClockGating:bdw */
> I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
> GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
> -
> - /* Wa4x4STCOptimizationDisable:bdw */
> - I915_WRITE(CACHE_MODE_1,
> - _MASKED_BIT_ENABLE(GEN8_4x4_STC_OPTIMIZATION_DISABLE));
> }
>
> static void haswell_init_clock_gating(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
>
> ilk_init_lp_watermarks(dev);
>
> /* L3 caching of data atomics doesn't work -- disable it. */
> I915_WRITE(HSW_SCRATCH1, HSW_SCRATCH1_L3_DATA_ATOMICS_DISABLE);
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 13543f8..9e24073 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -643,20 +643,90 @@ intel_init_pipe_control(struct intel_engine_cs *ring)
> return 0;
>
> err_unpin:
> i915_gem_object_ggtt_unpin(ring->scratch.obj);
> err_unref:
> drm_gem_object_unreference(&ring->scratch.obj->base);
> err:
> return ret;
> }
>
> +int bdw_init_workarounds(struct intel_engine_cs *ring)
> +{
> + int ret;
> +
> + /*
> + * workarounds applied in this fn are part of register state context,
> + * they need to be re-initialized followed by gpu reset, suspend/resume,
> + * module reload.
> + */
> +
> + /*
> + * update the number of dwords required based on the
> + * actual number of workarounds applied
> + */
> + ret = intel_ring_begin(ring, 24);
> + if (ret)
> + return ret;
> +
> + /* WaDisablePartialInstShootdown:bdw */
> + /* WaDisableThreadStallDopClockGating:bdw */
> + /* FIXME: Unclear whether we really need this on production bdw. */
> + INTEL_RING_EMIT_WA(ring, GEN8_ROW_CHICKEN,
> + _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE
> + | STALL_DOP_GATING_DISABLE));
> +
> + /* WaDisableDopClockGating:bdw May not be needed for production */
> + INTEL_RING_EMIT_WA(ring, GEN7_ROW_CHICKEN2,
> + _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
> +
> + /*
> + * This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for
> + * pre-production hardware
> + */
> + INTEL_RING_EMIT_WA(ring, HALF_SLICE_CHICKEN3,
> + _MASKED_BIT_ENABLE(GEN8_CENTROID_PIXEL_OPT_DIS
> + | GEN8_SAMPLER_POWER_BYPASS_DIS));
> +
> + INTEL_RING_EMIT_WA(ring, GEN7_HALF_SLICE_CHICKEN1,
> + _MASKED_BIT_ENABLE(GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE));
> +
> + INTEL_RING_EMIT_WA(ring, COMMON_SLICE_CHICKEN2,
> + _MASKED_BIT_ENABLE(GEN8_CSC2_SBE_VUE_CACHE_CONSERVATIVE));
> +
> + /* Use Force Non-Coherent whenever executing a 3D context. This is a
> + * workaround for for a possible hang in the unlikely event a TLB
> + * invalidation occurs during a PSD flush.
> + */
> + INTEL_RING_EMIT_WA(ring, HDC_CHICKEN0,
> + _MASKED_BIT_ENABLE(HDC_FORCE_NON_COHERENT));
> +
> + /* Wa4x4STCOptimizationDisable:bdw */
> + INTEL_RING_EMIT_WA(ring, CACHE_MODE_1,
> + _MASKED_BIT_ENABLE(GEN8_4x4_STC_OPTIMIZATION_DISABLE));
> +
> + /*
> + * BSpec recommends 8x4 when MSAA is used,
> + * however in practice 16x4 seems fastest.
> + *
> + * Note that PS/WM thread counts depend on the WIZ hashing
> + * disable bit, which we don't touch here, but it's good
> + * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
> + */
> + INTEL_RING_EMIT_WA(ring, GEN7_GT_MODE,
> + GEN6_WIZ_HASHING_MASK | GEN6_WIZ_HASHING_16x4);
> +
> + intel_ring_advance(ring);
> +
> + return 0;
> +}
> +
> static int init_render_ring(struct intel_engine_cs *ring)
> {
> struct drm_device *dev = ring->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> int ret = init_ring_common(ring);
> if (ret)
> return ret;
>
> /* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
> if (INTEL_INFO(dev)->gen >= 4 && INTEL_INFO(dev)->gen < 7)
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
> index 9cbf7b0..77fe667 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
> @@ -66,20 +66,26 @@ struct intel_hw_status_page {
> break; \
> } \
> ring->semaphore.signal_ggtt[RCS] = GEN8_SIGNAL_OFFSET(ring, RCS); \
> ring->semaphore.signal_ggtt[VCS] = GEN8_SIGNAL_OFFSET(ring, VCS); \
> ring->semaphore.signal_ggtt[BCS] = GEN8_SIGNAL_OFFSET(ring, BCS); \
> ring->semaphore.signal_ggtt[VECS] = GEN8_SIGNAL_OFFSET(ring, VECS); \
> ring->semaphore.signal_ggtt[VCS2] = GEN8_SIGNAL_OFFSET(ring, VCS2); \
> ring->semaphore.signal_ggtt[ring->id] = MI_SEMAPHORE_SYNC_INVALID; \
> } while(0)
>
> +#define INTEL_RING_EMIT_WA(_ring, _wa_reg, _wa_val) ({ \
> + intel_ring_emit(_ring, MI_LOAD_REGISTER_IMM(1)); \
> + intel_ring_emit(_ring, _wa_reg); \
> + intel_ring_emit(_ring, _wa_val); \
> + })
do {} while (0) would suffice since the macro doesn't return anything.
Not sure why it's a macro actually. A static function in intel_ringbuffer.c
would do just as well. If you want to keep it a macro, the argument
evaluations should have () around them.
I was also going to say that you could just call it ring_emit_lri() or
something, but I guess you plan to add the debugfs w/a stuff there which
makes the current name more appropriate. I'll let others bikeshed the
debugfs stuff since I have no real opinion on it.
Apart from that the patch seems good to me.
> +
> enum intel_ring_hangcheck_action {
> HANGCHECK_IDLE = 0,
> HANGCHECK_WAIT,
> HANGCHECK_ACTIVE,
> HANGCHECK_ACTIVE_LOOP,
> HANGCHECK_KICK,
> HANGCHECK_HUNG,
> };
>
> #define HANGCHECK_SCORE_RING_HUNG 31
> @@ -411,20 +417,21 @@ int intel_ring_flush_all_caches(struct intel_engine_cs *ring);
> int intel_ring_invalidate_all_caches(struct intel_engine_cs *ring);
>
> void intel_fini_pipe_control(struct intel_engine_cs *ring);
> int intel_init_pipe_control(struct intel_engine_cs *ring);
>
> int intel_init_render_ring_buffer(struct drm_device *dev);
> int intel_init_bsd_ring_buffer(struct drm_device *dev);
> int intel_init_bsd2_ring_buffer(struct drm_device *dev);
> int intel_init_blt_ring_buffer(struct drm_device *dev);
> int intel_init_vebox_ring_buffer(struct drm_device *dev);
> +int bdw_init_workarounds(struct intel_engine_cs *ring);
>
> u64 intel_ring_get_active_head(struct intel_engine_cs *ring);
> void intel_ring_setup_status_page(struct intel_engine_cs *ring);
>
> static inline u32 intel_ring_get_tail(struct intel_ringbuffer *ringbuf)
> {
> return ringbuf->tail;
> }
>
> static inline u32 intel_ring_get_seqno(struct intel_engine_cs *ring)
> --
> 2.0.4
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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