diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_sseu.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_sseu.c | 900 |
1 files changed, 900 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c new file mode 100644 index 000000000..66f21c735 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_sseu.c @@ -0,0 +1,900 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2019 Intel Corporation + */ + +#include <linux/string_helpers.h> + +#include "i915_drv.h" +#include "intel_engine_regs.h" +#include "intel_gt_regs.h" +#include "intel_sseu.h" + +void intel_sseu_set_info(struct sseu_dev_info *sseu, u8 max_slices, + u8 max_subslices, u8 max_eus_per_subslice) +{ + sseu->max_slices = max_slices; + sseu->max_subslices = max_subslices; + sseu->max_eus_per_subslice = max_eus_per_subslice; +} + +unsigned int +intel_sseu_subslice_total(const struct sseu_dev_info *sseu) +{ + unsigned int i, total = 0; + + if (sseu->has_xehp_dss) + return bitmap_weight(sseu->subslice_mask.xehp, + XEHP_BITMAP_BITS(sseu->subslice_mask)); + + for (i = 0; i < ARRAY_SIZE(sseu->subslice_mask.hsw); i++) + total += hweight8(sseu->subslice_mask.hsw[i]); + + return total; +} + +unsigned int +intel_sseu_get_hsw_subslices(const struct sseu_dev_info *sseu, u8 slice) +{ + WARN_ON(sseu->has_xehp_dss); + if (WARN_ON(slice >= sseu->max_slices)) + return 0; + + return sseu->subslice_mask.hsw[slice]; +} + +static u16 sseu_get_eus(const struct sseu_dev_info *sseu, int slice, + int subslice) +{ + if (sseu->has_xehp_dss) { + WARN_ON(slice > 0); + return sseu->eu_mask.xehp[subslice]; + } else { + return sseu->eu_mask.hsw[slice][subslice]; + } +} + +static void sseu_set_eus(struct sseu_dev_info *sseu, int slice, int subslice, + u16 eu_mask) +{ + GEM_WARN_ON(eu_mask && __fls(eu_mask) >= sseu->max_eus_per_subslice); + if (sseu->has_xehp_dss) { + GEM_WARN_ON(slice > 0); + sseu->eu_mask.xehp[subslice] = eu_mask; + } else { + sseu->eu_mask.hsw[slice][subslice] = eu_mask; + } +} + +static u16 compute_eu_total(const struct sseu_dev_info *sseu) +{ + int s, ss, total = 0; + + for (s = 0; s < sseu->max_slices; s++) + for (ss = 0; ss < sseu->max_subslices; ss++) + if (sseu->has_xehp_dss) + total += hweight16(sseu->eu_mask.xehp[ss]); + else + total += hweight16(sseu->eu_mask.hsw[s][ss]); + + return total; +} + +/** + * intel_sseu_copy_eumask_to_user - Copy EU mask into a userspace buffer + * @to: Pointer to userspace buffer to copy to + * @sseu: SSEU structure containing EU mask to copy + * + * Copies the EU mask to a userspace buffer in the format expected by + * the query ioctl's topology queries. + * + * Returns the result of the copy_to_user() operation. + */ +int intel_sseu_copy_eumask_to_user(void __user *to, + const struct sseu_dev_info *sseu) +{ + u8 eu_mask[GEN_SS_MASK_SIZE * GEN_MAX_EU_STRIDE] = {}; + int eu_stride = GEN_SSEU_STRIDE(sseu->max_eus_per_subslice); + int len = sseu->max_slices * sseu->max_subslices * eu_stride; + int s, ss, i; + + for (s = 0; s < sseu->max_slices; s++) { + for (ss = 0; ss < sseu->max_subslices; ss++) { + int uapi_offset = + s * sseu->max_subslices * eu_stride + + ss * eu_stride; + u16 mask = sseu_get_eus(sseu, s, ss); + + for (i = 0; i < eu_stride; i++) + eu_mask[uapi_offset + i] = + (mask >> (BITS_PER_BYTE * i)) & 0xff; + } + } + + return copy_to_user(to, eu_mask, len); +} + +/** + * intel_sseu_copy_ssmask_to_user - Copy subslice mask into a userspace buffer + * @to: Pointer to userspace buffer to copy to + * @sseu: SSEU structure containing subslice mask to copy + * + * Copies the subslice mask to a userspace buffer in the format expected by + * the query ioctl's topology queries. + * + * Returns the result of the copy_to_user() operation. + */ +int intel_sseu_copy_ssmask_to_user(void __user *to, + const struct sseu_dev_info *sseu) +{ + u8 ss_mask[GEN_SS_MASK_SIZE] = {}; + int ss_stride = GEN_SSEU_STRIDE(sseu->max_subslices); + int len = sseu->max_slices * ss_stride; + int s, ss, i; + + for (s = 0; s < sseu->max_slices; s++) { + for (ss = 0; ss < sseu->max_subslices; ss++) { + i = s * ss_stride * BITS_PER_BYTE + ss; + + if (!intel_sseu_has_subslice(sseu, s, ss)) + continue; + + ss_mask[i / BITS_PER_BYTE] |= BIT(i % BITS_PER_BYTE); + } + } + + return copy_to_user(to, ss_mask, len); +} + +static void gen11_compute_sseu_info(struct sseu_dev_info *sseu, + u32 ss_en, u16 eu_en) +{ + u32 valid_ss_mask = GENMASK(sseu->max_subslices - 1, 0); + int ss; + + sseu->slice_mask |= BIT(0); + sseu->subslice_mask.hsw[0] = 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); + + sseu->eu_per_subslice = hweight16(eu_en); + sseu->eu_total = compute_eu_total(sseu); +} + +static void xehp_compute_sseu_info(struct sseu_dev_info *sseu, + u16 eu_en) +{ + int ss; + + sseu->slice_mask |= BIT(0); + + bitmap_or(sseu->subslice_mask.xehp, + sseu->compute_subslice_mask.xehp, + sseu->geometry_subslice_mask.xehp, + XEHP_BITMAP_BITS(sseu->subslice_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); + + sseu->eu_per_subslice = hweight16(eu_en); + sseu->eu_total = compute_eu_total(sseu); +} + +static void +xehp_load_dss_mask(struct intel_uncore *uncore, + intel_sseu_ss_mask_t *ssmask, + int numregs, + ...) +{ + va_list argp; + u32 fuse_val[I915_MAX_SS_FUSE_REGS] = {}; + int i; + + if (WARN_ON(numregs > I915_MAX_SS_FUSE_REGS)) + numregs = I915_MAX_SS_FUSE_REGS; + + va_start(argp, numregs); + for (i = 0; i < numregs; i++) + fuse_val[i] = intel_uncore_read(uncore, va_arg(argp, i915_reg_t)); + va_end(argp); + + bitmap_from_arr32(ssmask->xehp, fuse_val, numregs * 32); +} + +static void xehp_sseu_info_init(struct intel_gt *gt) +{ + struct sseu_dev_info *sseu = >->info.sseu; + struct intel_uncore *uncore = gt->uncore; + u16 eu_en = 0; + u8 eu_en_fuse; + int num_compute_regs, num_geometry_regs; + int eu; + + if (IS_PONTEVECCHIO(gt->i915)) { + num_geometry_regs = 0; + num_compute_regs = 2; + } else { + num_geometry_regs = 1; + num_compute_regs = 1; + } + + /* + * The concept of slice has been removed in Xe_HP. To be compatible + * with prior generations, assume a single slice across the entire + * device. Then calculate out the DSS for each workload type within + * that software slice. + */ + intel_sseu_set_info(sseu, 1, + 32 * max(num_geometry_regs, num_compute_regs), + HAS_ONE_EU_PER_FUSE_BIT(gt->i915) ? 8 : 16); + sseu->has_xehp_dss = 1; + + xehp_load_dss_mask(uncore, &sseu->geometry_subslice_mask, + num_geometry_regs, + GEN12_GT_GEOMETRY_DSS_ENABLE); + xehp_load_dss_mask(uncore, &sseu->compute_subslice_mask, + num_compute_regs, + GEN12_GT_COMPUTE_DSS_ENABLE, + XEHPC_GT_COMPUTE_DSS_ENABLE_EXT); + + eu_en_fuse = intel_uncore_read(uncore, XEHP_EU_ENABLE) & XEHP_EU_ENA_MASK; + + if (HAS_ONE_EU_PER_FUSE_BIT(gt->i915)) + eu_en = eu_en_fuse; + else + for (eu = 0; eu < sseu->max_eus_per_subslice / 2; eu++) + if (eu_en_fuse & BIT(eu)) + eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1); + + xehp_compute_sseu_info(sseu, eu_en); +} + +static void gen12_sseu_info_init(struct intel_gt *gt) +{ + struct sseu_dev_info *sseu = >->info.sseu; + struct intel_uncore *uncore = gt->uncore; + u32 g_dss_en; + u16 eu_en = 0; + u8 eu_en_fuse; + u8 s_en; + int eu; + + /* + * Gen12 has Dual-Subslices, which behave similarly to 2 gen11 SS. + * Instead of splitting these, provide userspace with an array + * of DSS to more closely represent the hardware resource. + */ + 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); + + /* one bit per pair of EUs */ + eu_en_fuse = ~(intel_uncore_read(uncore, GEN11_EU_DISABLE) & + GEN11_EU_DIS_MASK); + + for (eu = 0; eu < sseu->max_eus_per_subslice / 2; eu++) + if (eu_en_fuse & BIT(eu)) + eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1); + + gen11_compute_sseu_info(sseu, g_dss_en, eu_en); + + /* TGL only supports slice-level power gating */ + sseu->has_slice_pg = 1; +} + +static void gen11_sseu_info_init(struct intel_gt *gt) +{ + struct sseu_dev_info *sseu = >->info.sseu; + struct intel_uncore *uncore = gt->uncore; + u32 ss_en; + u8 eu_en; + u8 s_en; + + if (IS_JSL_EHL(gt->i915)) + intel_sseu_set_info(sseu, 1, 4, 8); + 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, ss_en, eu_en); + + /* ICL has no power gating restrictions. */ + sseu->has_slice_pg = 1; + sseu->has_subslice_pg = 1; + sseu->has_eu_pg = 1; +} + +static void cherryview_sseu_info_init(struct intel_gt *gt) +{ + struct sseu_dev_info *sseu = >->info.sseu; + u32 fuse; + + fuse = intel_uncore_read(gt->uncore, CHV_FUSE_GT); + + sseu->slice_mask = BIT(0); + intel_sseu_set_info(sseu, 1, 2, 8); + + if (!(fuse & CHV_FGT_DISABLE_SS0)) { + u8 disabled_mask = + ((fuse & CHV_FGT_EU_DIS_SS0_R0_MASK) >> + CHV_FGT_EU_DIS_SS0_R0_SHIFT) | + (((fuse & CHV_FGT_EU_DIS_SS0_R1_MASK) >> + CHV_FGT_EU_DIS_SS0_R1_SHIFT) << 4); + + sseu->subslice_mask.hsw[0] |= BIT(0); + sseu_set_eus(sseu, 0, 0, ~disabled_mask & 0xFF); + } + + if (!(fuse & CHV_FGT_DISABLE_SS1)) { + u8 disabled_mask = + ((fuse & CHV_FGT_EU_DIS_SS1_R0_MASK) >> + CHV_FGT_EU_DIS_SS1_R0_SHIFT) | + (((fuse & CHV_FGT_EU_DIS_SS1_R1_MASK) >> + CHV_FGT_EU_DIS_SS1_R1_SHIFT) << 4); + + sseu->subslice_mask.hsw[0] |= BIT(1); + sseu_set_eus(sseu, 0, 1, ~disabled_mask & 0xFF); + } + + sseu->eu_total = compute_eu_total(sseu); + + /* + * CHV expected to always have a uniform distribution of EU + * across subslices. + */ + sseu->eu_per_subslice = intel_sseu_subslice_total(sseu) ? + sseu->eu_total / + intel_sseu_subslice_total(sseu) : + 0; + /* + * CHV supports subslice power gating on devices with more than + * one subslice, and supports EU power gating on devices with + * more than one EU pair per subslice. + */ + sseu->has_slice_pg = 0; + sseu->has_subslice_pg = intel_sseu_subslice_total(sseu) > 1; + sseu->has_eu_pg = (sseu->eu_per_subslice > 2); +} + +static void gen9_sseu_info_init(struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + struct sseu_dev_info *sseu = >->info.sseu; + struct intel_uncore *uncore = gt->uncore; + u32 fuse2, eu_disable, subslice_mask; + const u8 eu_mask = 0xff; + int s, ss; + + fuse2 = intel_uncore_read(uncore, GEN8_FUSE2); + sseu->slice_mask = (fuse2 & GEN8_F2_S_ENA_MASK) >> GEN8_F2_S_ENA_SHIFT; + + /* BXT has a single slice and at most 3 subslices. */ + intel_sseu_set_info(sseu, IS_GEN9_LP(i915) ? 1 : 3, + IS_GEN9_LP(i915) ? 3 : 4, 8); + + /* + * The subslice disable field is global, i.e. it applies + * to each of the enabled slices. + */ + subslice_mask = (1 << sseu->max_subslices) - 1; + subslice_mask &= ~((fuse2 & GEN9_F2_SS_DIS_MASK) >> + GEN9_F2_SS_DIS_SHIFT); + + /* + * Iterate through enabled slices and subslices to + * count the total enabled EU. + */ + for (s = 0; s < sseu->max_slices; s++) { + if (!(sseu->slice_mask & BIT(s))) + /* skip disabled slice */ + continue; + + sseu->subslice_mask.hsw[s] = subslice_mask; + + eu_disable = intel_uncore_read(uncore, GEN9_EU_DISABLE(s)); + for (ss = 0; ss < sseu->max_subslices; ss++) { + int eu_per_ss; + u8 eu_disabled_mask; + + if (!intel_sseu_has_subslice(sseu, s, ss)) + /* skip disabled subslice */ + continue; + + eu_disabled_mask = (eu_disable >> (ss * 8)) & eu_mask; + + sseu_set_eus(sseu, s, ss, ~eu_disabled_mask & eu_mask); + + eu_per_ss = sseu->max_eus_per_subslice - + hweight8(eu_disabled_mask); + + /* + * Record which subslice(s) has(have) 7 EUs. we + * can tune the hash used to spread work among + * subslices if they are unbalanced. + */ + if (eu_per_ss == 7) + sseu->subslice_7eu[s] |= BIT(ss); + } + } + + sseu->eu_total = compute_eu_total(sseu); + + /* + * SKL is expected to always have a uniform distribution + * of EU across subslices with the exception that any one + * EU in any one subslice may be fused off for die + * recovery. BXT is expected to be perfectly uniform in EU + * distribution. + */ + sseu->eu_per_subslice = + intel_sseu_subslice_total(sseu) ? + DIV_ROUND_UP(sseu->eu_total, intel_sseu_subslice_total(sseu)) : + 0; + + /* + * SKL+ supports slice power gating on devices with more than + * one slice, and supports EU power gating on devices with + * more than one EU pair per subslice. BXT+ supports subslice + * power gating on devices with more than one subslice, and + * supports EU power gating on devices with more than one EU + * pair per subslice. + */ + sseu->has_slice_pg = + !IS_GEN9_LP(i915) && hweight8(sseu->slice_mask) > 1; + sseu->has_subslice_pg = + IS_GEN9_LP(i915) && intel_sseu_subslice_total(sseu) > 1; + sseu->has_eu_pg = sseu->eu_per_subslice > 2; + + if (IS_GEN9_LP(i915)) { +#define IS_SS_DISABLED(ss) (!(sseu->subslice_mask.hsw[0] & BIT(ss))) + RUNTIME_INFO(i915)->has_pooled_eu = hweight8(sseu->subslice_mask.hsw[0]) == 3; + + sseu->min_eu_in_pool = 0; + if (HAS_POOLED_EU(i915)) { + if (IS_SS_DISABLED(2) || IS_SS_DISABLED(0)) + sseu->min_eu_in_pool = 3; + else if (IS_SS_DISABLED(1)) + sseu->min_eu_in_pool = 6; + else + sseu->min_eu_in_pool = 9; + } +#undef IS_SS_DISABLED + } +} + +static void bdw_sseu_info_init(struct intel_gt *gt) +{ + struct sseu_dev_info *sseu = >->info.sseu; + struct intel_uncore *uncore = gt->uncore; + int s, ss; + u32 fuse2, subslice_mask, eu_disable[3]; /* s_max */ + u32 eu_disable0, eu_disable1, eu_disable2; + + fuse2 = intel_uncore_read(uncore, GEN8_FUSE2); + sseu->slice_mask = (fuse2 & GEN8_F2_S_ENA_MASK) >> GEN8_F2_S_ENA_SHIFT; + intel_sseu_set_info(sseu, 3, 3, 8); + + /* + * The subslice disable field is global, i.e. it applies + * to each of the enabled slices. + */ + subslice_mask = GENMASK(sseu->max_subslices - 1, 0); + subslice_mask &= ~((fuse2 & GEN8_F2_SS_DIS_MASK) >> + GEN8_F2_SS_DIS_SHIFT); + eu_disable0 = intel_uncore_read(uncore, GEN8_EU_DISABLE0); + eu_disable1 = intel_uncore_read(uncore, GEN8_EU_DISABLE1); + eu_disable2 = intel_uncore_read(uncore, GEN8_EU_DISABLE2); + eu_disable[0] = eu_disable0 & GEN8_EU_DIS0_S0_MASK; + eu_disable[1] = (eu_disable0 >> GEN8_EU_DIS0_S1_SHIFT) | + ((eu_disable1 & GEN8_EU_DIS1_S1_MASK) << + (32 - GEN8_EU_DIS0_S1_SHIFT)); + eu_disable[2] = (eu_disable1 >> GEN8_EU_DIS1_S2_SHIFT) | + ((eu_disable2 & GEN8_EU_DIS2_S2_MASK) << + (32 - GEN8_EU_DIS1_S2_SHIFT)); + + /* + * Iterate through enabled slices and subslices to + * count the total enabled EU. + */ + for (s = 0; s < sseu->max_slices; s++) { + if (!(sseu->slice_mask & BIT(s))) + /* skip disabled slice */ + continue; + + sseu->subslice_mask.hsw[s] = subslice_mask; + + for (ss = 0; ss < sseu->max_subslices; ss++) { + u8 eu_disabled_mask; + u32 n_disabled; + + if (!intel_sseu_has_subslice(sseu, s, ss)) + /* skip disabled subslice */ + continue; + + eu_disabled_mask = + eu_disable[s] >> (ss * sseu->max_eus_per_subslice); + + sseu_set_eus(sseu, s, ss, ~eu_disabled_mask & 0xFF); + + n_disabled = hweight8(eu_disabled_mask); + + /* + * Record which subslices have 7 EUs. + */ + if (sseu->max_eus_per_subslice - n_disabled == 7) + sseu->subslice_7eu[s] |= 1 << ss; + } + } + + sseu->eu_total = compute_eu_total(sseu); + + /* + * BDW is expected to always have a uniform distribution of EU across + * subslices with the exception that any one EU in any one subslice may + * be fused off for die recovery. + */ + sseu->eu_per_subslice = + intel_sseu_subslice_total(sseu) ? + DIV_ROUND_UP(sseu->eu_total, intel_sseu_subslice_total(sseu)) : + 0; + + /* + * BDW supports slice power gating on devices with more than + * one slice. + */ + sseu->has_slice_pg = hweight8(sseu->slice_mask) > 1; + sseu->has_subslice_pg = 0; + sseu->has_eu_pg = 0; +} + +static void hsw_sseu_info_init(struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + struct sseu_dev_info *sseu = >->info.sseu; + u32 fuse1; + u8 subslice_mask = 0; + int s, ss; + + /* + * There isn't a register to tell us how many slices/subslices. We + * work off the PCI-ids here. + */ + switch (INTEL_INFO(i915)->gt) { + default: + MISSING_CASE(INTEL_INFO(i915)->gt); + fallthrough; + case 1: + sseu->slice_mask = BIT(0); + subslice_mask = BIT(0); + break; + case 2: + sseu->slice_mask = BIT(0); + subslice_mask = BIT(0) | BIT(1); + break; + case 3: + sseu->slice_mask = BIT(0) | BIT(1); + subslice_mask = BIT(0) | BIT(1); + break; + } + + fuse1 = intel_uncore_read(gt->uncore, HSW_PAVP_FUSE1); + switch (REG_FIELD_GET(HSW_F1_EU_DIS_MASK, fuse1)) { + default: + MISSING_CASE(REG_FIELD_GET(HSW_F1_EU_DIS_MASK, fuse1)); + fallthrough; + case HSW_F1_EU_DIS_10EUS: + sseu->eu_per_subslice = 10; + break; + case HSW_F1_EU_DIS_8EUS: + sseu->eu_per_subslice = 8; + break; + case HSW_F1_EU_DIS_6EUS: + sseu->eu_per_subslice = 6; + break; + } + + intel_sseu_set_info(sseu, hweight8(sseu->slice_mask), + hweight8(subslice_mask), + sseu->eu_per_subslice); + + for (s = 0; s < sseu->max_slices; s++) { + sseu->subslice_mask.hsw[s] = subslice_mask; + + for (ss = 0; ss < sseu->max_subslices; ss++) { + sseu_set_eus(sseu, s, ss, + (1UL << sseu->eu_per_subslice) - 1); + } + } + + sseu->eu_total = compute_eu_total(sseu); + + /* No powergating for you. */ + sseu->has_slice_pg = 0; + sseu->has_subslice_pg = 0; + sseu->has_eu_pg = 0; +} + +void intel_sseu_info_init(struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + + if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) + xehp_sseu_info_init(gt); + else if (GRAPHICS_VER(i915) >= 12) + gen12_sseu_info_init(gt); + else if (GRAPHICS_VER(i915) >= 11) + gen11_sseu_info_init(gt); + else if (GRAPHICS_VER(i915) >= 9) + gen9_sseu_info_init(gt); + else if (IS_BROADWELL(i915)) + bdw_sseu_info_init(gt); + else if (IS_CHERRYVIEW(i915)) + cherryview_sseu_info_init(gt); + else if (IS_HASWELL(i915)) + hsw_sseu_info_init(gt); +} + +u32 intel_sseu_make_rpcs(struct intel_gt *gt, + const struct intel_sseu *req_sseu) +{ + struct drm_i915_private *i915 = gt->i915; + const struct sseu_dev_info *sseu = >->info.sseu; + bool subslice_pg = sseu->has_subslice_pg; + u8 slices, subslices; + u32 rpcs = 0; + + /* + * No explicit RPCS request is needed to ensure full + * slice/subslice/EU enablement prior to Gen9. + */ + if (GRAPHICS_VER(i915) < 9) + return 0; + + /* + * If i915/perf is active, we want a stable powergating configuration + * on the system. Use the configuration pinned by i915/perf. + */ + if (i915->perf.exclusive_stream) + req_sseu = &i915->perf.sseu; + + slices = hweight8(req_sseu->slice_mask); + subslices = hweight8(req_sseu->subslice_mask); + + /* + * Since the SScount bitfield in GEN8_R_PWR_CLK_STATE is only three bits + * wide and Icelake has up to eight subslices, specfial programming is + * needed in order to correctly enable all subslices. + * + * According to documentation software must consider the configuration + * as 2x4x8 and hardware will translate this to 1x8x8. + * + * Furthemore, even though SScount is three bits, maximum documented + * value for it is four. From this some rules/restrictions follow: + * + * 1. + * If enabled subslice count is greater than four, two whole slices must + * be enabled instead. + * + * 2. + * When more than one slice is enabled, hardware ignores the subslice + * count altogether. + * + * From these restrictions it follows that it is not possible to enable + * a count of subslices between the SScount maximum of four restriction, + * and the maximum available number on a particular SKU. Either all + * subslices are enabled, or a count between one and four on the first + * slice. + */ + if (GRAPHICS_VER(i915) == 11 && + slices == 1 && + subslices > min_t(u8, 4, hweight8(sseu->subslice_mask.hsw[0]) / 2)) { + GEM_BUG_ON(subslices & 1); + + subslice_pg = false; + slices *= 2; + } + + /* + * Starting in Gen9, render power gating can leave + * slice/subslice/EU in a partially enabled state. We + * must make an explicit request through RPCS for full + * enablement. + */ + if (sseu->has_slice_pg) { + u32 mask, val = slices; + + if (GRAPHICS_VER(i915) >= 11) { + mask = GEN11_RPCS_S_CNT_MASK; + val <<= GEN11_RPCS_S_CNT_SHIFT; + } else { + mask = GEN8_RPCS_S_CNT_MASK; + val <<= GEN8_RPCS_S_CNT_SHIFT; + } + + GEM_BUG_ON(val & ~mask); + val &= mask; + + rpcs |= GEN8_RPCS_ENABLE | GEN8_RPCS_S_CNT_ENABLE | val; + } + + if (subslice_pg) { + u32 val = subslices; + + val <<= GEN8_RPCS_SS_CNT_SHIFT; + + GEM_BUG_ON(val & ~GEN8_RPCS_SS_CNT_MASK); + val &= GEN8_RPCS_SS_CNT_MASK; + + rpcs |= GEN8_RPCS_ENABLE | GEN8_RPCS_SS_CNT_ENABLE | val; + } + + if (sseu->has_eu_pg) { + u32 val; + + val = req_sseu->min_eus_per_subslice << GEN8_RPCS_EU_MIN_SHIFT; + GEM_BUG_ON(val & ~GEN8_RPCS_EU_MIN_MASK); + val &= GEN8_RPCS_EU_MIN_MASK; + + rpcs |= val; + + val = req_sseu->max_eus_per_subslice << GEN8_RPCS_EU_MAX_SHIFT; + GEM_BUG_ON(val & ~GEN8_RPCS_EU_MAX_MASK); + val &= GEN8_RPCS_EU_MAX_MASK; + + rpcs |= val; + + rpcs |= GEN8_RPCS_ENABLE; + } + + return rpcs; +} + +void intel_sseu_dump(const struct sseu_dev_info *sseu, struct drm_printer *p) +{ + int s; + + if (sseu->has_xehp_dss) { + drm_printf(p, "subslice total: %u\n", + intel_sseu_subslice_total(sseu)); + drm_printf(p, "geometry dss mask=%*pb\n", + XEHP_BITMAP_BITS(sseu->geometry_subslice_mask), + sseu->geometry_subslice_mask.xehp); + drm_printf(p, "compute dss mask=%*pb\n", + XEHP_BITMAP_BITS(sseu->compute_subslice_mask), + sseu->compute_subslice_mask.xehp); + } else { + drm_printf(p, "slice total: %u, mask=%04x\n", + hweight8(sseu->slice_mask), sseu->slice_mask); + drm_printf(p, "subslice total: %u\n", + intel_sseu_subslice_total(sseu)); + + for (s = 0; s < sseu->max_slices; s++) { + u8 ss_mask = sseu->subslice_mask.hsw[s]; + + drm_printf(p, "slice%d: %u subslices, mask=%08x\n", + s, hweight8(ss_mask), ss_mask); + } + } + + drm_printf(p, "EU total: %u\n", sseu->eu_total); + drm_printf(p, "EU per subslice: %u\n", sseu->eu_per_subslice); + drm_printf(p, "has slice power gating: %s\n", + str_yes_no(sseu->has_slice_pg)); + drm_printf(p, "has subslice power gating: %s\n", + str_yes_no(sseu->has_subslice_pg)); + drm_printf(p, "has EU power gating: %s\n", + str_yes_no(sseu->has_eu_pg)); +} + +static void sseu_print_hsw_topology(const struct sseu_dev_info *sseu, + struct drm_printer *p) +{ + int s, ss; + + for (s = 0; s < sseu->max_slices; s++) { + u8 ss_mask = sseu->subslice_mask.hsw[s]; + + drm_printf(p, "slice%d: %u subslice(s) (0x%08x):\n", + s, hweight8(ss_mask), ss_mask); + + for (ss = 0; ss < sseu->max_subslices; ss++) { + u16 enabled_eus = sseu_get_eus(sseu, s, ss); + + drm_printf(p, "\tsubslice%d: %u EUs (0x%hx)\n", + ss, hweight16(enabled_eus), enabled_eus); + } + } +} + +static void sseu_print_xehp_topology(const struct sseu_dev_info *sseu, + struct drm_printer *p) +{ + int dss; + + for (dss = 0; dss < sseu->max_subslices; dss++) { + u16 enabled_eus = sseu_get_eus(sseu, 0, dss); + + drm_printf(p, "DSS_%02d: G:%3s C:%3s, %2u EUs (0x%04hx)\n", dss, + str_yes_no(test_bit(dss, sseu->geometry_subslice_mask.xehp)), + str_yes_no(test_bit(dss, sseu->compute_subslice_mask.xehp)), + hweight16(enabled_eus), enabled_eus); + } +} + +void intel_sseu_print_topology(struct drm_i915_private *i915, + const struct sseu_dev_info *sseu, + struct drm_printer *p) +{ + if (sseu->max_slices == 0) { + drm_printf(p, "Unavailable\n"); + } else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) { + sseu_print_xehp_topology(sseu, p); + } else { + sseu_print_hsw_topology(sseu, p); + } +} + +void intel_sseu_print_ss_info(const char *type, + const struct sseu_dev_info *sseu, + struct seq_file *m) +{ + int s; + + if (sseu->has_xehp_dss) { + seq_printf(m, " %s Geometry DSS: %u\n", type, + bitmap_weight(sseu->geometry_subslice_mask.xehp, + XEHP_BITMAP_BITS(sseu->geometry_subslice_mask))); + seq_printf(m, " %s Compute DSS: %u\n", type, + bitmap_weight(sseu->compute_subslice_mask.xehp, + XEHP_BITMAP_BITS(sseu->compute_subslice_mask))); + } else { + for (s = 0; s < fls(sseu->slice_mask); s++) + seq_printf(m, " %s Slice%i subslices: %u\n", type, + s, hweight8(sseu->subslice_mask.hsw[s])); + } +} + +u16 intel_slicemask_from_xehp_dssmask(intel_sseu_ss_mask_t dss_mask, + int dss_per_slice) +{ + intel_sseu_ss_mask_t per_slice_mask = {}; + unsigned long slice_mask = 0; + int i; + + WARN_ON(DIV_ROUND_UP(XEHP_BITMAP_BITS(dss_mask), dss_per_slice) > + 8 * sizeof(slice_mask)); + + bitmap_fill(per_slice_mask.xehp, dss_per_slice); + for (i = 0; !bitmap_empty(dss_mask.xehp, XEHP_BITMAP_BITS(dss_mask)); i++) { + if (bitmap_intersects(dss_mask.xehp, per_slice_mask.xehp, dss_per_slice)) + slice_mask |= BIT(i); + + bitmap_shift_right(dss_mask.xehp, dss_mask.xehp, dss_per_slice, + XEHP_BITMAP_BITS(dss_mask)); + } + + return slice_mask; +} |