Imre Deak <imre.deak@xxxxxxxxx> writes:
> From: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
>
> v2: (Imre)
> - Access only subslices that are known to exist.
> - Reset explictly the MCR selector to slice/sub-slice ID 0 after the
> readout.
> - Use the subslice INSTDONE bits for the hangcheck/subunits-stuck
> detection too.
> - Take the uncore lock for the MCR-select/subslice-readout sequence.
>
> Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 14 ++++--
> drivers/gpu/drm/i915/i915_gpu_error.c | 76 ++++++++++++++++++++++++++++++---
> drivers/gpu/drm/i915/i915_irq.c | 25 ++++++++---
> drivers/gpu/drm/i915/i915_reg.h | 5 +++
> drivers/gpu/drm/i915/intel_ringbuffer.h | 23 +++++++++-
> 5 files changed, 125 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 45244f9..0f84165 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1281,6 +1281,9 @@ static void i915_instdone_info(struct drm_i915_private *dev_priv,
> struct seq_file *m,
> struct intel_instdone *instdone)
> {
> + int slice;
> + int subslice;
> +
> seq_printf(m, "\t\tINSTDONE: 0x%08x\n",
> instdone->instdone);
>
> @@ -1293,10 +1296,13 @@ static void i915_instdone_info(struct drm_i915_private *dev_priv,
> if (INTEL_GEN(dev_priv) <= 6)
> return;
>
> - seq_printf(m, "\t\tSAMPLER_INSTDONE: 0x%08x\n",
> - instdone->sampler);
> - seq_printf(m, "\t\tROW_INSTDONE: 0x%08x\n",
> - instdone->row);
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> + seq_printf(m, "\t\tSAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice, instdone->sampler[slice][subslice]);
> +
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> + seq_printf(m, "\t\tROW_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice, instdone->row[slice][subslice]);
> }
>
> static int i915_hangcheck_info(struct seq_file *m, void *unused)
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 80fe101..06d4309 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -231,6 +231,9 @@ static const char *hangcheck_action_to_str(enum intel_engine_hangcheck_action a)
> static void error_print_instdone(struct drm_i915_error_state_buf *m,
> struct drm_i915_error_engine *ee)
> {
> + int slice;
> + int subslice;
> +
> err_printf(m, " INSTDONE: 0x%08x\n",
> ee->instdone.instdone);
>
> @@ -243,10 +246,15 @@ static void error_print_instdone(struct drm_i915_error_state_buf *m,
> if (INTEL_GEN(m->i915) <= 6)
> return;
>
> - err_printf(m, " SAMPLER_INSTDONE: 0x%08x\n",
> - ee->instdone.sampler);
> - err_printf(m, " ROW_INSTDONE: 0x%08x\n",
> - ee->instdone.row);
> + for_each_instdone_slice_subslice(m->i915, slice, subslice)
> + err_printf(m, " SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice,
> + ee->instdone.sampler[slice][subslice]);
> +
> + for_each_instdone_slice_subslice(m->i915, slice, subslice)
> + err_printf(m, " ROW_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice,
> + ee->instdone.row[slice][subslice]);
> }
>
> static void error_print_engine(struct drm_i915_error_state_buf *m,
> @@ -1534,12 +1542,52 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
> }
> }
>
> +static inline uint32_t
> +read_subslice_reg(struct drm_i915_private *dev_priv, int slice,
> + int subslice, i915_reg_t reg)
> +{
> + uint32_t mcr;
> + uint32_t ret;
> + enum forcewake_domains fw_domains;
> +
> + fw_domains = intel_uncore_forcewake_for_reg(dev_priv, reg,
> + FW_REG_READ);
> + fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
> + GEN8_MCR_SELECTOR,
> + FW_REG_READ | FW_REG_WRITE);
> +
> + spin_lock_irq(&dev_priv->uncore.lock);
> + intel_uncore_forcewake_get__locked(dev_priv, fw_domains);
> +
> + mcr = I915_READ_FW(GEN8_MCR_SELECTOR);
> + /*
> + * The HW expects the slice and sublice selectors to be reset to 0
> + * after reading out the registers.
> + */
> + WARN_ON_ONCE(mcr & (GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK));
> + mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
> + mcr |= GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
> + I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
> +
> + ret = I915_READ_FW(reg);
> +
> + mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
> + I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
> +
> + intel_uncore_forcewake_put__locked(dev_priv, fw_domains);
> + spin_unlock_irq(&dev_priv->uncore.lock);
> +
> + return ret;
> +}
> +
> /* NB: please notice the memset */
> void i915_get_engine_instdone(struct drm_i915_private *dev_priv,
> enum intel_engine_id engine_id,
> struct intel_instdone *instdone)
> {
> u32 mmio_base = dev_priv->engine[engine_id].mmio_base;
> + int slice;
> + int subslice;
>
> memset(instdone, 0, sizeof(*instdone));
>
> @@ -1551,8 +1599,24 @@ void i915_get_engine_instdone(struct drm_i915_private *dev_priv,
> break;
>
> instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
> - instdone->sampler = I915_READ(GEN7_SAMPLER_INSTDONE);
> - instdone->row = I915_READ(GEN7_ROW_INSTDONE);
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
> + instdone->sampler[slice][subslice] =
> + read_subslice_reg(dev_priv, slice, subslice,
> + GEN7_SAMPLER_INSTDONE);
> + instdone->row[slice][subslice] =
> + read_subslice_reg(dev_priv, slice, subslice,
> + GEN7_ROW_INSTDONE);
> + }
> + break;
> + case 7:
> + instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
> +
> + if (engine_id != RCS)
> + break;
> +
> + instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
> + instdone->sampler[0][0] = I915_READ(GEN7_SAMPLER_INSTDONE);
> + instdone->row[0][0] = I915_READ(GEN7_ROW_INSTDONE);
>
> break;
> case 6:
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 82cf823..d44f4d8 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2554,6 +2554,9 @@ static inline void
> i915_err_print_instdone(struct drm_i915_private *dev_priv,
> struct intel_instdone *instdone)
> {
> + int slice;
> + int subslice;
> +
> pr_err(" INSTDONE: 0x%08x\n", instdone->instdone);
>
> if (INTEL_GEN(dev_priv) <= 3)
> @@ -2564,8 +2567,13 @@ i915_err_print_instdone(struct drm_i915_private *dev_priv,
> if (INTEL_GEN(dev_priv) <= 6)
> return;
>
> - pr_err(" SAMPLER_INSTDONE: 0x%08x\n", instdone->sampler);
> - pr_err(" ROW_INSTDONE: 0x%08x\n", instdone->row);
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> + pr_err(" SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice, instdone->sampler[slice][subslice]);
> +
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> + pr_err(" ROW_INSTDONE[%d][%d]: 0x%08x\n",
> + slice, subslice, instdone->row[slice][subslice]);
> }
>
> static void i915_report_and_clear_eir(struct drm_i915_private *dev_priv)
> @@ -2982,6 +2990,8 @@ static bool subunits_stuck(struct intel_engine_cs *engine)
> struct intel_instdone instdone;
> struct intel_instdone *accu_instdone = &engine->hangcheck.instdone;
> bool stuck;
> + int slice;
> + int subslice;
>
> if (engine->id != RCS)
> return true;
> @@ -2997,10 +3007,13 @@ static bool subunits_stuck(struct intel_engine_cs *engine)
> &accu_instdone->instdone);
> stuck &= instdone_unchanged(instdone.slice_common,
> &accu_instdone->slice_common);
> - stuck &= instdone_unchanged(instdone.sampler,
> - &accu_instdone->sampler);
> - stuck &= instdone_unchanged(instdone.row,
> - &accu_instdone->row);
> +
> + for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
> + stuck &= instdone_unchanged(instdone.sampler[slice][subslice],
> + &accu_instdone->sampler[slice][subslice]);
> + stuck &= instdone_unchanged(instdone.row[slice][subslice],
> + &accu_instdone->row[slice][subslice]);
> + }
>
> return stuck;
> }
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index e84bc2e..24e741d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1708,6 +1708,11 @@ enum skl_disp_power_wells {
> #define GEN7_SC_INSTDONE _MMIO(0x7100)
> #define GEN7_SAMPLER_INSTDONE _MMIO(0xe160)
> #define GEN7_ROW_INSTDONE _MMIO(0xe164)
> +#define GEN8_MCR_SELECTOR _MMIO(0xfdc)
> +#define GEN8_MCR_SLICE(slice) (((slice) & 3) << 26)
> +#define GEN8_MCR_SLICE_MASK GEN8_MCR_SLICE(3)
> +#define GEN8_MCR_SUBSLICE(subslice) (((subslice) & 3) << 24)
There is some conflicting info about these changing on gen9 to widen
and shift the masks. So I am confused.
Can we easily test if we get sane slice/subslice states?
-Mika
> +#define GEN8_MCR_SUBSLICE_MASK GEN8_MCR_SUBSLICE(3)
> #define RING_IPEIR(base) _MMIO((base)+0x64)
> #define RING_IPEHR(base) _MMIO((base)+0x68)
> /*
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
> index afc3f1e..983d7da 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
> @@ -73,12 +73,31 @@ enum intel_engine_hangcheck_action {
>
> #define HANGCHECK_SCORE_RING_HUNG 31
>
> +#define I915_MAX_SLICES 3
> +#define I915_MAX_SUBSLICES 3
> +
> +#define instdone_slice_mask(dev_priv__) \
> + (INTEL_GEN(dev_priv__) == 7 ? \
> + 1 : INTEL_INFO(dev_priv__)->sseu.slice_mask)
> +
> +#define instdone_subslice_mask(dev_priv__) \
> + (INTEL_GEN(dev_priv__) == 7 ? \
> + 1 : INTEL_INFO(dev_priv__)->sseu.subslice_mask)
> +
> +#define for_each_instdone_slice_subslice(dev_priv__, slice__, subslice__) \
> + for ((slice__) = 0, (subslice__) = 0; \
> + (slice__) < I915_MAX_SLICES; \
> + (subslice__) = ((subslice__) + 1) < I915_MAX_SUBSLICES ? (subslice__) + 1 : 0, \
> + (slice__) += ((subslice__) == 0)) \
> + for_each_if((BIT(slice__) & instdone_slice_mask(dev_priv__)) && \
> + (BIT(subslice__) & instdone_subslice_mask(dev_priv__)))
> +
> struct intel_instdone {
> u32 instdone;
> /* The following exist only in the RCS engine */
> u32 slice_common;
> - u32 sampler;
> - u32 row;
> + u32 sampler[I915_MAX_SLICES][I915_MAX_SUBSLICES];
> + u32 row[I915_MAX_SLICES][I915_MAX_SUBSLICES];
> };
>
> struct intel_engine_hangcheck {
> --
> 2.5.0
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