On Fri, May 27, 2022 at 09:33:47AM -0700, Matt Roper wrote:
> For PVC, the base die and compute tile have separate stepping values
> that we need to track; we'll use the existing graphics_step field to
> represent the compute tile stepping and add a new 'basedie_step' field.
>
> Unlike past platforms, steppings for these components are represented by
> specific bitfields within the PCI revision ID, and we shouldn't make
> assumptions about the non-CT, non-BD bits staying 0. Let's update our
> stepping code accordingly.
>
> Bspec: 44484
Reviewed-by: Matt Atwood <matthew.s.atwood@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 13 ++++++
> drivers/gpu/drm/i915/intel_step.c | 70 ++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_step.h | 4 +-
> 3 files changed, 85 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 74b3caccd839..ec1b3484fdaf 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -943,6 +943,7 @@ static inline struct intel_gt *to_gt(struct drm_i915_private *i915)
> #define INTEL_DISPLAY_STEP(__i915) (RUNTIME_INFO(__i915)->step.display_step)
> #define INTEL_GRAPHICS_STEP(__i915) (RUNTIME_INFO(__i915)->step.graphics_step)
> #define INTEL_MEDIA_STEP(__i915) (RUNTIME_INFO(__i915)->step.media_step)
> +#define INTEL_BASEDIE_STEP(__i915) (RUNTIME_INFO(__i915)->step.basedie_step)
>
> #define IS_DISPLAY_STEP(__i915, since, until) \
> (drm_WARN_ON(&(__i915)->drm, INTEL_DISPLAY_STEP(__i915) == STEP_NONE), \
> @@ -956,6 +957,10 @@ static inline struct intel_gt *to_gt(struct drm_i915_private *i915)
> (drm_WARN_ON(&(__i915)->drm, INTEL_MEDIA_STEP(__i915) == STEP_NONE), \
> INTEL_MEDIA_STEP(__i915) >= (since) && INTEL_MEDIA_STEP(__i915) < (until))
>
> +#define IS_BASEDIE_STEP(__i915, since, until) \
> + (drm_WARN_ON(&(__i915)->drm, INTEL_BASEDIE_STEP(__i915) == STEP_NONE), \
> + INTEL_BASEDIE_STEP(__i915) >= (since) && INTEL_BASEDIE_STEP(__i915) < (until))
> +
> static __always_inline unsigned int
> __platform_mask_index(const struct intel_runtime_info *info,
> enum intel_platform p)
> @@ -1208,6 +1213,14 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
> (IS_DG2(__i915) && \
> IS_DISPLAY_STEP(__i915, since, until))
>
> +#define IS_PVC_BD_STEP(__i915, since, until) \
> + (IS_PONTEVECCHIO(__i915) && \
> + IS_BASEDIE_STEP(__i915, since, until))
> +
> +#define IS_PVC_CT_STEP(__i915, since, until) \
> + (IS_PONTEVECCHIO(__i915) && \
> + IS_GRAPHICS_STEP(__i915, since, until))
> +
> #define IS_LP(dev_priv) (INTEL_INFO(dev_priv)->is_lp)
> #define IS_GEN9_LP(dev_priv) (GRAPHICS_VER(dev_priv) == 9 && IS_LP(dev_priv))
> #define IS_GEN9_BC(dev_priv) (GRAPHICS_VER(dev_priv) == 9 && !IS_LP(dev_priv))
> diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
> index 74e8e4680028..42b3133d8387 100644
> --- a/drivers/gpu/drm/i915/intel_step.c
> +++ b/drivers/gpu/drm/i915/intel_step.c
> @@ -135,6 +135,8 @@ static const struct intel_step_info adlp_n_revids[] = {
> [0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_D0 },
> };
>
> +static void pvc_step_init(struct drm_i915_private *i915, int pci_revid);
> +
> void intel_step_init(struct drm_i915_private *i915)
> {
> const struct intel_step_info *revids = NULL;
> @@ -142,7 +144,10 @@ void intel_step_init(struct drm_i915_private *i915)
> int revid = INTEL_REVID(i915);
> struct intel_step_info step = {};
>
> - if (IS_DG2_G10(i915)) {
> + if (IS_PONTEVECCHIO(i915)) {
> + pvc_step_init(i915, revid);
> + return;
> + } else if (IS_DG2_G10(i915)) {
> revids = dg2_g10_revid_step_tbl;
> size = ARRAY_SIZE(dg2_g10_revid_step_tbl);
> } else if (IS_DG2_G11(i915)) {
> @@ -235,6 +240,69 @@ void intel_step_init(struct drm_i915_private *i915)
> RUNTIME_INFO(i915)->step = step;
> }
>
> +#define PVC_BD_REVID GENMASK(5, 3)
> +#define PVC_CT_REVID GENMASK(2, 0)
> +
> +static const int pvc_bd_subids[] = {
> + [0x0] = STEP_A0,
> + [0x3] = STEP_B0,
> + [0x4] = STEP_B1,
> + [0x5] = STEP_B3,
> +};
> +
> +static const int pvc_ct_subids[] = {
> + [0x3] = STEP_A0,
> + [0x5] = STEP_B0,
> + [0x6] = STEP_B1,
> + [0x7] = STEP_C0,
> +};
> +
> +static int
> +pvc_step_lookup(struct drm_i915_private *i915, const char *type,
> + const int *table, int size, int subid)
> +{
> + if (subid < size && table[subid] != STEP_NONE)
> + return table[subid];
> +
> + drm_warn(&i915->drm, "Unknown %s id 0x%02x\n", type, subid);
> +
> + /*
> + * As on other platforms, try to use the next higher ID if we land on a
> + * gap in the table.
> + */
> + while (subid < size && table[subid] == STEP_NONE)
> + subid++;
> +
> + if (subid < size) {
> + drm_dbg(&i915->drm, "Using steppings for %s id 0x%02x\n",
> + type, subid);
> + return table[subid];
> + }
> +
> + drm_dbg(&i915->drm, "Using future steppings\n");
> + return STEP_FUTURE;
> +}
> +
> +/*
> + * PVC needs special handling since we don't lookup the
> + * revid in a table, but rather specific bitfields within
> + * the revid for various components.
> + */
> +static void pvc_step_init(struct drm_i915_private *i915, int pci_revid)
> +{
> + int ct_subid, bd_subid;
> +
> + bd_subid = FIELD_GET(PVC_BD_REVID, pci_revid);
> + ct_subid = FIELD_GET(PVC_CT_REVID, pci_revid);
> +
> + RUNTIME_INFO(i915)->step.basedie_step =
> + pvc_step_lookup(i915, "Base Die", pvc_bd_subids,
> + ARRAY_SIZE(pvc_bd_subids), bd_subid);
> + RUNTIME_INFO(i915)->step.graphics_step =
> + pvc_step_lookup(i915, "Compute Tile", pvc_ct_subids,
> + ARRAY_SIZE(pvc_ct_subids), ct_subid);
> +}
> +
> #define STEP_NAME_CASE(name) \
> case STEP_##name: \
> return #name;
> diff --git a/drivers/gpu/drm/i915/intel_step.h b/drivers/gpu/drm/i915/intel_step.h
> index d71a99bd5179..a6b12bfa9744 100644
> --- a/drivers/gpu/drm/i915/intel_step.h
> +++ b/drivers/gpu/drm/i915/intel_step.h
> @@ -11,9 +11,10 @@
> struct drm_i915_private;
>
> struct intel_step_info {
> - u8 graphics_step;
> + u8 graphics_step; /* Represents the compute tile on Xe_HPC */
> u8 display_step;
> u8 media_step;
> + u8 basedie_step;
> };
>
> #define STEP_ENUM_VAL(name) STEP_##name,
> @@ -25,6 +26,7 @@ struct intel_step_info {
> func(B0) \
> func(B1) \
> func(B2) \
> + func(B3) \
> func(C0) \
> func(C1) \
> func(D0) \
> --
> 2.35.3
>
