[Intel-gfx] [PATCH v3 4/8] drm/i915: switch KBL to the new stepping scheme
Souza, Jose
jose.souza at intel.com
Thu Mar 25 20:54:50 UTC 2021
On Mon, 2021-03-08 at 15:56 +0200, Jani Nikula wrote:
> Add new symbolic names for revision ids, and convert KBL revids to use
> them via the new stepping check macros.
>
> This also fixes theoretical out of bounds access to kbl_revids array.
>
> v2: Rename stepping->step
>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
>
> ---
>
> The initialization sounds like an early part of
> intel_device_info_runtime_init(), and indeed touches runtime info.
> ---
> drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 2 +-
> drivers/gpu/drm/i915/gt/intel_workarounds.c | 6 +-
> drivers/gpu/drm/i915/i915_drv.c | 3 +-
> drivers/gpu/drm/i915/i915_drv.h | 24 ++-----
> drivers/gpu/drm/i915/intel_pm.c | 4 +-
> drivers/gpu/drm/i915/intel_step.c | 69 ++++++++++++++++++---
> drivers/gpu/drm/i915/intel_step.h | 11 +++-
> 7 files changed, 82 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> index cac80af7ad1c..74e8acc72da0 100644
> --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
> @@ -42,7 +42,7 @@ int gen8_emit_flush_rcs(struct i915_request *rq, u32 mode)
> vf_flush_wa = true;
>
>
> /* WaForGAMHang:kbl */
> - if (IS_KBL_GT_REVID(rq->engine->i915, 0, KBL_REVID_B0))
> + if (IS_KBL_GT_STEP(rq->engine->i915, 0, STEP_B0))
> dc_flush_wa = true;
> }
>
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 2827d4f2e086..0c502a733779 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -481,7 +481,7 @@ static void kbl_ctx_workarounds_init(struct intel_engine_cs *engine,
> gen9_ctx_workarounds_init(engine, wal);
>
>
> /* WaToEnableHwFixForPushConstHWBug:kbl */
> - if (IS_KBL_GT_REVID(i915, KBL_REVID_C0, REVID_FOREVER))
> + if (IS_KBL_GT_STEP(i915, STEP_C0, STEP_FOREVER))
> wa_masked_en(wal, COMMON_SLICE_CHICKEN2,
> GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
>
>
> @@ -899,7 +899,7 @@ kbl_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
> gen9_gt_workarounds_init(i915, wal);
>
>
> /* WaDisableDynamicCreditSharing:kbl */
> - if (IS_KBL_GT_REVID(i915, 0, KBL_REVID_B0))
> + if (IS_KBL_GT_STEP(i915, 0, STEP_B0))
> wa_write_or(wal,
> GAMT_CHKN_BIT_REG,
> GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING);
> @@ -2020,7 +2020,7 @@ xcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
> struct drm_i915_private *i915 = engine->i915;
>
>
> /* WaKBLVECSSemaphoreWaitPoll:kbl */
> - if (IS_KBL_GT_REVID(i915, KBL_REVID_A0, KBL_REVID_E0)) {
> + if (IS_KBL_GT_STEP(i915, STEP_A0, STEP_E0)) {
> wa_write(wal,
> RING_SEMA_WAIT_POLL(engine->mmio_base),
> 1);
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 3edd5e47ad68..83214ffe6cf1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -273,7 +273,7 @@ static void intel_detect_preproduction_hw(struct drm_i915_private *dev_priv)
> pre |= IS_HSW_EARLY_SDV(dev_priv);
> pre |= IS_SKL_REVID(dev_priv, 0, SKL_REVID_F0);
> pre |= IS_BXT_REVID(dev_priv, 0, BXT_REVID_B_LAST);
> - pre |= IS_KBL_GT_REVID(dev_priv, 0, KBL_REVID_A0);
> + pre |= IS_KBL_GT_STEP(dev_priv, 0, STEP_A0);
> pre |= IS_GLK_REVID(dev_priv, 0, GLK_REVID_A2);
>
>
> if (pre) {
> @@ -307,6 +307,7 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
> return -ENODEV;
>
>
> intel_device_info_subplatform_init(dev_priv);
> + intel_step_init(dev_priv);
>
>
> intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);
> intel_uncore_init_early(&dev_priv->uncore, dev_priv);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index a543b1ad9ba9..7f259aab4226 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1475,26 +1475,10 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
> #define IS_BXT_REVID(dev_priv, since, until) \
> (IS_BROXTON(dev_priv) && IS_REVID(dev_priv, since, until))
>
>
> -enum {
> - KBL_REVID_A0,
> - KBL_REVID_B0,
> - KBL_REVID_B1,
> - KBL_REVID_C0,
> - KBL_REVID_D0,
> - KBL_REVID_D1,
> - KBL_REVID_E0,
> - KBL_REVID_F0,
> - KBL_REVID_G0,
> -};
> -
> -#define IS_KBL_GT_REVID(dev_priv, since, until) \
> - (IS_KABYLAKE(dev_priv) && \
> - kbl_revids[INTEL_REVID(dev_priv)].gt_stepping >= since && \
> - kbl_revids[INTEL_REVID(dev_priv)].gt_stepping <= until)
> -#define IS_KBL_DISP_REVID(dev_priv, since, until) \
> - (IS_KABYLAKE(dev_priv) && \
> - kbl_revids[INTEL_REVID(dev_priv)].disp_stepping >= since && \
> - kbl_revids[INTEL_REVID(dev_priv)].disp_stepping <= until)
> +#define IS_KBL_GT_STEP(dev_priv, since, until) \
> + (IS_KABYLAKE(dev_priv) && IS_GT_STEP(dev_priv, since, until))
> +#define IS_KBL_DISPLAY_STEP(dev_priv, since, until) \
> + (IS_KABYLAKE(dev_priv) && IS_DISPLAY_STEP(dev_priv, since, until))
>
>
> #define GLK_REVID_A0 0x0
> #define GLK_REVID_A1 0x1
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 854ffecd98d9..fd8d2732f68b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -7213,12 +7213,12 @@ static void kbl_init_clock_gating(struct drm_i915_private *dev_priv)
> FBC_LLC_FULLY_OPEN);
>
>
> /* WaDisableSDEUnitClockGating:kbl */
> - if (IS_KBL_GT_REVID(dev_priv, 0, KBL_REVID_B0))
> + if (IS_KBL_GT_STEP(dev_priv, 0, STEP_B0))
> intel_uncore_write(&dev_priv->uncore, GEN8_UCGCTL6, intel_uncore_read(&dev_priv->uncore, GEN8_UCGCTL6) |
> GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
>
>
> /* WaDisableGamClockGating:kbl */
> - if (IS_KBL_GT_REVID(dev_priv, 0, KBL_REVID_B0))
> + if (IS_KBL_GT_STEP(dev_priv, 0, STEP_B0))
> intel_uncore_write(&dev_priv->uncore, GEN6_UCGCTL1, intel_uncore_read(&dev_priv->uncore, GEN6_UCGCTL1) |
> GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
>
>
> diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
> index e19820cbe8e3..aaa9494b0f4f 100644
> --- a/drivers/gpu/drm/i915/intel_step.c
> +++ b/drivers/gpu/drm/i915/intel_step.c
> @@ -13,15 +13,17 @@
> * can test against in a regular manner.
> */
>
>
> -const struct i915_rev_steppings kbl_revids[] = {
> - [0] = { .gt_stepping = KBL_REVID_A0, .disp_stepping = KBL_REVID_A0 },
> - [1] = { .gt_stepping = KBL_REVID_B0, .disp_stepping = KBL_REVID_B0 },
> - [2] = { .gt_stepping = KBL_REVID_C0, .disp_stepping = KBL_REVID_B0 },
> - [3] = { .gt_stepping = KBL_REVID_D0, .disp_stepping = KBL_REVID_B0 },
> - [4] = { .gt_stepping = KBL_REVID_F0, .disp_stepping = KBL_REVID_C0 },
> - [5] = { .gt_stepping = KBL_REVID_C0, .disp_stepping = KBL_REVID_B1 },
> - [6] = { .gt_stepping = KBL_REVID_D1, .disp_stepping = KBL_REVID_B1 },
> - [7] = { .gt_stepping = KBL_REVID_G0, .disp_stepping = KBL_REVID_C0 },
> +
> +/* FIXME: what about REVID_E0 */
> +static const struct i915_rev_steppings kbl_revids[] = {
> + [0] = { .gt_stepping = STEP_A0, .disp_stepping = STEP_A0 },
> + [1] = { .gt_stepping = STEP_B0, .disp_stepping = STEP_B0 },
> + [2] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B0 },
> + [3] = { .gt_stepping = STEP_D0, .disp_stepping = STEP_B0 },
> + [4] = { .gt_stepping = STEP_F0, .disp_stepping = STEP_C0 },
> + [5] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B1 },
> + [6] = { .gt_stepping = STEP_D1, .disp_stepping = STEP_B1 },
> + [7] = { .gt_stepping = STEP_G0, .disp_stepping = STEP_C0 },
> };
>
>
> const struct i915_rev_steppings tgl_uy_revid_step_tbl[] = {
> @@ -44,3 +46,52 @@ const struct i915_rev_steppings adls_revid_step_tbl[] = {
> [0x8] = { .gt_stepping = STEP_C0, .disp_stepping = STEP_B0 },
> [0xC] = { .gt_stepping = STEP_D0, .disp_stepping = STEP_C0 },
> };
> +
> +void intel_step_init(struct drm_i915_private *i915)
> +{
> + const struct i915_rev_steppings *revids = NULL;
> + int size = 0;
> + int revid = INTEL_REVID(i915);
> + struct i915_rev_steppings step = {};
> +
> + if (IS_KABYLAKE(i915)) {
> + revids = kbl_revids;
> + size = ARRAY_SIZE(kbl_revids);
> + }
> +
> + /* Not using the stepping scheme for the platform yet. */
> + if (!revids)
> + return;
> +
> + if (revid < size && revids[revid].gt_stepping != STEP_NONE) {
> + step = revids[revid];
> + } else {
> + drm_dbg(&i915->drm, "Unknown revid 0x%02x\n", revid);
This should be more than dbg so we can caught this and fix it.
Other than that:
Reviewed-by: José Roberto de Souza <jose.souza at intel.com>
> +
> + /*
> + * If we hit a gap in the revid array, use the information for
> + * the next revid.
> + *
> + * This may be wrong in all sorts of ways, especially if the
> + * steppings in the array are not monotonically increasing, but
> + * it's better than defaulting to 0.
> + */
> + while (revid < size && revids[revid].gt_stepping == STEP_NONE)
> + revid++;
> +
> + if (revid < size) {
> + drm_dbg(&i915->drm, "Using steppings for revid 0x%02x\n",
> + revid);
> + step = revids[revid];
> + } else {
> + drm_dbg(&i915->drm, "Using future steppings\n");
> + step.gt_stepping = STEP_FUTURE;
> + step.disp_stepping = STEP_FUTURE;
> + }
> + }
> +
> + if (drm_WARN_ON(&i915->drm, step.gt_stepping == STEP_NONE))
> + return;
> +
> + RUNTIME_INFO(i915)->step = step;
> +}
> diff --git a/drivers/gpu/drm/i915/intel_step.h b/drivers/gpu/drm/i915/intel_step.h
> index 8b3ef19d935b..b29e15f71214 100644
> --- a/drivers/gpu/drm/i915/intel_step.h
> +++ b/drivers/gpu/drm/i915/intel_step.h
> @@ -8,6 +8,8 @@
>
>
> #include <linux/types.h>
>
>
> +struct drm_i915_private;
> +
> struct i915_rev_steppings {
> u8 gt_stepping;
> u8 disp_stepping;
> @@ -17,7 +19,6 @@ struct i915_rev_steppings {
> #define TGL_REVID_STEP_TBL_SIZE 2
> #define ADLS_REVID_STEP_TBL_SIZE 13
>
>
> -extern const struct i915_rev_steppings kbl_revids[];
> extern const struct i915_rev_steppings tgl_uy_revid_step_tbl[TGL_UY_REVID_STEP_TBL_SIZE];
> extern const struct i915_rev_steppings tgl_revid_step_tbl[TGL_REVID_STEP_TBL_SIZE];
> extern const struct i915_rev_steppings adls_revid_step_tbl[ADLS_REVID_STEP_TBL_SIZE];
> @@ -34,6 +35,14 @@ enum intel_step {
> STEP_B1,
> STEP_C0,
> STEP_D0,
> + STEP_D1,
> + STEP_E0,
> + STEP_F0,
> + STEP_G0,
> + STEP_FUTURE,
> + STEP_FOREVER,
> };
>
>
> +void intel_step_init(struct drm_i915_private *i915);
> +
> #endif /* __INTEL_STEP_H__ */
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