Although gen11 and gen12 architectures supported the concept of multiple slices, in practice all the platforms that were actually designed only had a single slice (i.e., note the parameters to 'intel_sseu_set_info' that we pass for each platform). We can simplify the code slightly by dropping the multi-slice logic from gen11+ platforms.
v2: - Promote drm_dbg to drm_WARN_ON if the slice fuse register reports unexpected fusing. (Tvrtko)
Cc: Tvrtko Ursulin tvrtko.ursulin@linux.intel.com Signed-off-by: Matt Roper matthew.d.roper@intel.com --- drivers/gpu/drm/i915/gt/intel_sseu.c | 76 +++++++++++++--------------- 1 file changed, 36 insertions(+), 40 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c index b5fd479a7b85..7e5222ad2f98 100644 --- a/drivers/gpu/drm/i915/gt/intel_sseu.c +++ b/drivers/gpu/drm/i915/gt/intel_sseu.c @@ -119,52 +119,37 @@ static u16 compute_eu_total(const struct sseu_dev_info *sseu) return total; }
-static u32 get_ss_stride_mask(struct sseu_dev_info *sseu, u8 s, u32 ss_en) -{ - u32 ss_mask; - - ss_mask = ss_en >> (s * sseu->max_subslices); - ss_mask &= GENMASK(sseu->max_subslices - 1, 0); - - return ss_mask; -} - -static void gen11_compute_sseu_info(struct sseu_dev_info *sseu, u8 s_en, +static void gen11_compute_sseu_info(struct sseu_dev_info *sseu, u32 g_ss_en, u32 c_ss_en, u16 eu_en) { - int s, ss; + u32 valid_ss_mask = GENMASK(sseu->max_subslices - 1, 0); + int ss;
/* g_ss_en/c_ss_en represent entire subslice mask across all slices */ GEM_BUG_ON(sseu->max_slices * sseu->max_subslices > sizeof(g_ss_en) * BITS_PER_BYTE);
- for (s = 0; s < sseu->max_slices; s++) { - if ((s_en & BIT(s)) == 0) - continue; + sseu->slice_mask |= BIT(0);
- sseu->slice_mask |= BIT(s); - - /* - * XeHP introduces the concept of compute vs geometry DSS. To - * reduce variation between GENs around subslice usage, store a - * mask for both the geometry and compute enabled masks since - * userspace will need to be able to query these masks - * independently. Also compute a total enabled subslice count - * for the purposes of selecting subslices to use in a - * particular GEM context. - */ - intel_sseu_set_subslices(sseu, s, sseu->compute_subslice_mask, - get_ss_stride_mask(sseu, s, c_ss_en)); - intel_sseu_set_subslices(sseu, s, sseu->geometry_subslice_mask, - get_ss_stride_mask(sseu, s, g_ss_en)); - intel_sseu_set_subslices(sseu, s, sseu->subslice_mask, - get_ss_stride_mask(sseu, s, - g_ss_en | c_ss_en)); + /* + * XeHP introduces the concept of compute vs geometry DSS. To reduce + * variation between GENs around subslice usage, store a mask for both + * the geometry and compute enabled masks since userspace will need to + * be able to query these masks independently. Also compute a total + * enabled subslice count for the purposes of selecting subslices to + * use in a particular GEM context. + */ + intel_sseu_set_subslices(sseu, 0, sseu->compute_subslice_mask, + c_ss_en & valid_ss_mask); + intel_sseu_set_subslices(sseu, 0, sseu->geometry_subslice_mask, + g_ss_en & valid_ss_mask); + intel_sseu_set_subslices(sseu, 0, sseu->subslice_mask, + (g_ss_en | c_ss_en) & valid_ss_mask); + + for (ss = 0; ss < sseu->max_subslices; ss++) + if (intel_sseu_has_subslice(sseu, 0, ss)) + sseu_set_eus(sseu, 0, ss, eu_en);
- for (ss = 0; ss < sseu->max_subslices; ss++) - if (intel_sseu_has_subslice(sseu, s, ss)) - sseu_set_eus(sseu, s, ss, eu_en); - } sseu->eu_per_subslice = hweight16(eu_en); sseu->eu_total = compute_eu_total(sseu); } @@ -196,7 +181,7 @@ static void xehp_sseu_info_init(struct intel_gt *gt) if (eu_en_fuse & BIT(eu)) eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1);
- gen11_compute_sseu_info(sseu, 0x1, g_dss_en, c_dss_en, eu_en); + gen11_compute_sseu_info(sseu, g_dss_en, c_dss_en, eu_en); }
static void gen12_sseu_info_init(struct intel_gt *gt) @@ -216,8 +201,13 @@ static void gen12_sseu_info_init(struct intel_gt *gt) */ intel_sseu_set_info(sseu, 1, 6, 16);
+ /* + * Although gen12 architecture supported multiple slices, TGL, RKL, + * DG1, and ADL only had a single slice. + */ s_en = intel_uncore_read(uncore, GEN11_GT_SLICE_ENABLE) & GEN11_GT_S_ENA_MASK; + drm_WARN_ON(>->i915->drm, s_en != 0x1);
g_dss_en = intel_uncore_read(uncore, GEN12_GT_GEOMETRY_DSS_ENABLE);
@@ -229,7 +219,7 @@ static void gen12_sseu_info_init(struct intel_gt *gt) if (eu_en_fuse & BIT(eu)) eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1);
- gen11_compute_sseu_info(sseu, s_en, g_dss_en, 0, eu_en); + gen11_compute_sseu_info(sseu, g_dss_en, 0, eu_en);
/* TGL only supports slice-level power gating */ sseu->has_slice_pg = 1; @@ -248,14 +238,20 @@ static void gen11_sseu_info_init(struct intel_gt *gt) else intel_sseu_set_info(sseu, 1, 8, 8);
+ /* + * Although gen11 architecture supported multiple slices, ICL and + * EHL/JSL only had a single slice in practice. + */ s_en = intel_uncore_read(uncore, GEN11_GT_SLICE_ENABLE) & GEN11_GT_S_ENA_MASK; + drm_WARN_ON(>->i915->drm, s_en != 0x1); + ss_en = ~intel_uncore_read(uncore, GEN11_GT_SUBSLICE_DISABLE);
eu_en = ~(intel_uncore_read(uncore, GEN11_EU_DISABLE) & GEN11_EU_DIS_MASK);
- gen11_compute_sseu_info(sseu, s_en, ss_en, 0, eu_en); + gen11_compute_sseu_info(sseu, ss_en, 0, eu_en);
/* ICL has no power gating restrictions. */ sseu->has_slice_pg = 1;