| /* |
| * Copyright © 2016 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| */ |
| |
| #include "i915_drv.h" |
| |
| void intel_device_info_dump(struct drm_i915_private *dev_priv) |
| { |
| const struct intel_device_info *info = &dev_priv->info; |
| |
| #define PRINT_S(name) "%s" |
| #define SEP_EMPTY |
| #define PRINT_FLAG(name) info->name ? #name "," : "" |
| #define SEP_COMMA , |
| DRM_DEBUG_DRIVER("i915 device info: gen=%i, pciid=0x%04x rev=0x%02x flags=" |
| DEV_INFO_FOR_EACH_FLAG(PRINT_S, SEP_EMPTY), |
| info->gen, |
| dev_priv->drm.pdev->device, |
| dev_priv->drm.pdev->revision, |
| DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG, SEP_COMMA)); |
| #undef PRINT_S |
| #undef SEP_EMPTY |
| #undef PRINT_FLAG |
| #undef SEP_COMMA |
| } |
| |
| static void cherryview_sseu_info_init(struct drm_i915_private *dev_priv) |
| { |
| struct intel_device_info *info = mkwrite_device_info(dev_priv); |
| u32 fuse, eu_dis; |
| |
| fuse = I915_READ(CHV_FUSE_GT); |
| |
| info->slice_total = 1; |
| |
| if (!(fuse & CHV_FGT_DISABLE_SS0)) { |
| info->subslice_per_slice++; |
| eu_dis = fuse & (CHV_FGT_EU_DIS_SS0_R0_MASK | |
| CHV_FGT_EU_DIS_SS0_R1_MASK); |
| info->eu_total += 8 - hweight32(eu_dis); |
| } |
| |
| if (!(fuse & CHV_FGT_DISABLE_SS1)) { |
| info->subslice_per_slice++; |
| eu_dis = fuse & (CHV_FGT_EU_DIS_SS1_R0_MASK | |
| CHV_FGT_EU_DIS_SS1_R1_MASK); |
| info->eu_total += 8 - hweight32(eu_dis); |
| } |
| |
| info->subslice_total = info->subslice_per_slice; |
| /* |
| * CHV expected to always have a uniform distribution of EU |
| * across subslices. |
| */ |
| info->eu_per_subslice = info->subslice_total ? |
| info->eu_total / info->subslice_total : |
| 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. |
| */ |
| info->has_slice_pg = 0; |
| info->has_subslice_pg = (info->subslice_total > 1); |
| info->has_eu_pg = (info->eu_per_subslice > 2); |
| } |
| |
| static void gen9_sseu_info_init(struct drm_i915_private *dev_priv) |
| { |
| struct intel_device_info *info = mkwrite_device_info(dev_priv); |
| int s_max = 3, ss_max = 4, eu_max = 8; |
| int s, ss; |
| u32 fuse2, s_enable, ss_disable, eu_disable; |
| u8 eu_mask = 0xff; |
| |
| fuse2 = I915_READ(GEN8_FUSE2); |
| s_enable = (fuse2 & GEN8_F2_S_ENA_MASK) >> GEN8_F2_S_ENA_SHIFT; |
| ss_disable = (fuse2 & GEN9_F2_SS_DIS_MASK) >> GEN9_F2_SS_DIS_SHIFT; |
| |
| info->slice_total = hweight32(s_enable); |
| /* |
| * The subslice disable field is global, i.e. it applies |
| * to each of the enabled slices. |
| */ |
| info->subslice_per_slice = ss_max - hweight32(ss_disable); |
| info->subslice_total = info->slice_total * info->subslice_per_slice; |
| |
| /* |
| * Iterate through enabled slices and subslices to |
| * count the total enabled EU. |
| */ |
| for (s = 0; s < s_max; s++) { |
| if (!(s_enable & BIT(s))) |
| /* skip disabled slice */ |
| continue; |
| |
| eu_disable = I915_READ(GEN9_EU_DISABLE(s)); |
| for (ss = 0; ss < ss_max; ss++) { |
| int eu_per_ss; |
| |
| if (ss_disable & BIT(ss)) |
| /* skip disabled subslice */ |
| continue; |
| |
| eu_per_ss = eu_max - hweight8((eu_disable >> (ss*8)) & |
| eu_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) |
| info->subslice_7eu[s] |= BIT(ss); |
| |
| info->eu_total += eu_per_ss; |
| } |
| } |
| |
| /* |
| * 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. |
| */ |
| info->eu_per_subslice = info->subslice_total ? |
| DIV_ROUND_UP(info->eu_total, |
| info->subslice_total) : 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. |
| */ |
| info->has_slice_pg = |
| (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) && |
| info->slice_total > 1; |
| info->has_subslice_pg = |
| IS_BROXTON(dev_priv) && info->subslice_total > 1; |
| info->has_eu_pg = info->eu_per_subslice > 2; |
| |
| if (IS_BROXTON(dev_priv)) { |
| #define IS_SS_DISABLED(_ss_disable, ss) (_ss_disable & BIT(ss)) |
| /* |
| * There is a HW issue in 2x6 fused down parts that requires |
| * Pooled EU to be enabled as a WA. The pool configuration |
| * changes depending upon which subslice is fused down. This |
| * doesn't affect if the device has all 3 subslices enabled. |
| */ |
| /* WaEnablePooledEuFor2x6:bxt */ |
| info->has_pooled_eu = ((info->subslice_per_slice == 3) || |
| (info->subslice_per_slice == 2 && |
| INTEL_REVID(dev_priv) < BXT_REVID_C0)); |
| |
| info->min_eu_in_pool = 0; |
| if (info->has_pooled_eu) { |
| if (IS_SS_DISABLED(ss_disable, 0) || |
| IS_SS_DISABLED(ss_disable, 2)) |
| info->min_eu_in_pool = 3; |
| else if (IS_SS_DISABLED(ss_disable, 1)) |
| info->min_eu_in_pool = 6; |
| else |
| info->min_eu_in_pool = 9; |
| } |
| #undef IS_SS_DISABLED |
| } |
| } |
| |
| static void broadwell_sseu_info_init(struct drm_i915_private *dev_priv) |
| { |
| struct intel_device_info *info = mkwrite_device_info(dev_priv); |
| const int s_max = 3, ss_max = 3, eu_max = 8; |
| int s, ss; |
| u32 fuse2, eu_disable[s_max], s_enable, ss_disable; |
| |
| fuse2 = I915_READ(GEN8_FUSE2); |
| s_enable = (fuse2 & GEN8_F2_S_ENA_MASK) >> GEN8_F2_S_ENA_SHIFT; |
| ss_disable = (fuse2 & GEN8_F2_SS_DIS_MASK) >> GEN8_F2_SS_DIS_SHIFT; |
| |
| eu_disable[0] = I915_READ(GEN8_EU_DISABLE0) & GEN8_EU_DIS0_S0_MASK; |
| eu_disable[1] = (I915_READ(GEN8_EU_DISABLE0) >> GEN8_EU_DIS0_S1_SHIFT) | |
| ((I915_READ(GEN8_EU_DISABLE1) & GEN8_EU_DIS1_S1_MASK) << |
| (32 - GEN8_EU_DIS0_S1_SHIFT)); |
| eu_disable[2] = (I915_READ(GEN8_EU_DISABLE1) >> GEN8_EU_DIS1_S2_SHIFT) | |
| ((I915_READ(GEN8_EU_DISABLE2) & GEN8_EU_DIS2_S2_MASK) << |
| (32 - GEN8_EU_DIS1_S2_SHIFT)); |
| |
| info->slice_total = hweight32(s_enable); |
| |
| /* |
| * The subslice disable field is global, i.e. it applies |
| * to each of the enabled slices. |
| */ |
| info->subslice_per_slice = ss_max - hweight32(ss_disable); |
| info->subslice_total = info->slice_total * info->subslice_per_slice; |
| |
| /* |
| * Iterate through enabled slices and subslices to |
| * count the total enabled EU. |
| */ |
| for (s = 0; s < s_max; s++) { |
| if (!(s_enable & (0x1 << s))) |
| /* skip disabled slice */ |
| continue; |
| |
| for (ss = 0; ss < ss_max; ss++) { |
| u32 n_disabled; |
| |
| if (ss_disable & (0x1 << ss)) |
| /* skip disabled subslice */ |
| continue; |
| |
| n_disabled = hweight8(eu_disable[s] >> (ss * eu_max)); |
| |
| /* |
| * Record which subslices have 7 EUs. |
| */ |
| if (eu_max - n_disabled == 7) |
| info->subslice_7eu[s] |= 1 << ss; |
| |
| info->eu_total += eu_max - n_disabled; |
| } |
| } |
| |
| /* |
| * 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. |
| */ |
| info->eu_per_subslice = info->subslice_total ? |
| DIV_ROUND_UP(info->eu_total, info->subslice_total) : 0; |
| |
| /* |
| * BDW supports slice power gating on devices with more than |
| * one slice. |
| */ |
| info->has_slice_pg = (info->slice_total > 1); |
| info->has_subslice_pg = 0; |
| info->has_eu_pg = 0; |
| } |
| |
| /* |
| * Determine various intel_device_info fields at runtime. |
| * |
| * Use it when either: |
| * - it's judged too laborious to fill n static structures with the limit |
| * when a simple if statement does the job, |
| * - run-time checks (eg read fuse/strap registers) are needed. |
| * |
| * This function needs to be called: |
| * - after the MMIO has been setup as we are reading registers, |
| * - after the PCH has been detected, |
| * - before the first usage of the fields it can tweak. |
| */ |
| void intel_device_info_runtime_init(struct drm_i915_private *dev_priv) |
| { |
| struct intel_device_info *info = mkwrite_device_info(dev_priv); |
| enum pipe pipe; |
| |
| /* |
| * Skylake and Broxton currently don't expose the topmost plane as its |
| * use is exclusive with the legacy cursor and we only want to expose |
| * one of those, not both. Until we can safely expose the topmost plane |
| * as a DRM_PLANE_TYPE_CURSOR with all the features exposed/supported, |
| * we don't expose the topmost plane at all to prevent ABI breakage |
| * down the line. |
| */ |
| if (IS_BROXTON(dev_priv)) { |
| info->num_sprites[PIPE_A] = 2; |
| info->num_sprites[PIPE_B] = 2; |
| info->num_sprites[PIPE_C] = 1; |
| } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) |
| for_each_pipe(dev_priv, pipe) |
| info->num_sprites[pipe] = 2; |
| else |
| for_each_pipe(dev_priv, pipe) |
| info->num_sprites[pipe] = 1; |
| |
| if (i915.disable_display) { |
| DRM_INFO("Display disabled (module parameter)\n"); |
| info->num_pipes = 0; |
| } else if (info->num_pipes > 0 && |
| (IS_GEN7(dev_priv) || IS_GEN8(dev_priv)) && |
| HAS_PCH_SPLIT(dev_priv)) { |
| u32 fuse_strap = I915_READ(FUSE_STRAP); |
| u32 sfuse_strap = I915_READ(SFUSE_STRAP); |
| |
| /* |
| * SFUSE_STRAP is supposed to have a bit signalling the display |
| * is fused off. Unfortunately it seems that, at least in |
| * certain cases, fused off display means that PCH display |
| * reads don't land anywhere. In that case, we read 0s. |
| * |
| * On CPT/PPT, we can detect this case as SFUSE_STRAP_FUSE_LOCK |
| * should be set when taking over after the firmware. |
| */ |
| if (fuse_strap & ILK_INTERNAL_DISPLAY_DISABLE || |
| sfuse_strap & SFUSE_STRAP_DISPLAY_DISABLED || |
| (dev_priv->pch_type == PCH_CPT && |
| !(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) { |
| DRM_INFO("Display fused off, disabling\n"); |
| info->num_pipes = 0; |
| } else if (fuse_strap & IVB_PIPE_C_DISABLE) { |
| DRM_INFO("PipeC fused off\n"); |
| info->num_pipes -= 1; |
| } |
| } else if (info->num_pipes > 0 && IS_GEN9(dev_priv)) { |
| u32 dfsm = I915_READ(SKL_DFSM); |
| u8 disabled_mask = 0; |
| bool invalid; |
| int num_bits; |
| |
| if (dfsm & SKL_DFSM_PIPE_A_DISABLE) |
| disabled_mask |= BIT(PIPE_A); |
| if (dfsm & SKL_DFSM_PIPE_B_DISABLE) |
| disabled_mask |= BIT(PIPE_B); |
| if (dfsm & SKL_DFSM_PIPE_C_DISABLE) |
| disabled_mask |= BIT(PIPE_C); |
| |
| num_bits = hweight8(disabled_mask); |
| |
| switch (disabled_mask) { |
| case BIT(PIPE_A): |
| case BIT(PIPE_B): |
| case BIT(PIPE_A) | BIT(PIPE_B): |
| case BIT(PIPE_A) | BIT(PIPE_C): |
| invalid = true; |
| break; |
| default: |
| invalid = false; |
| } |
| |
| if (num_bits > info->num_pipes || invalid) |
| DRM_ERROR("invalid pipe fuse configuration: 0x%x\n", |
| disabled_mask); |
| else |
| info->num_pipes -= num_bits; |
| } |
| |
| /* Initialize slice/subslice/EU info */ |
| if (IS_CHERRYVIEW(dev_priv)) |
| cherryview_sseu_info_init(dev_priv); |
| else if (IS_BROADWELL(dev_priv)) |
| broadwell_sseu_info_init(dev_priv); |
| else if (INTEL_INFO(dev_priv)->gen >= 9) |
| gen9_sseu_info_init(dev_priv); |
| |
| info->has_snoop = !info->has_llc; |
| |
| /* Snooping is broken on BXT A stepping. */ |
| if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) |
| info->has_snoop = false; |
| |
| DRM_DEBUG_DRIVER("slice total: %u\n", info->slice_total); |
| DRM_DEBUG_DRIVER("subslice total: %u\n", info->subslice_total); |
| DRM_DEBUG_DRIVER("subslice per slice: %u\n", info->subslice_per_slice); |
| DRM_DEBUG_DRIVER("EU total: %u\n", info->eu_total); |
| DRM_DEBUG_DRIVER("EU per subslice: %u\n", info->eu_per_subslice); |
| DRM_DEBUG_DRIVER("has slice power gating: %s\n", |
| info->has_slice_pg ? "y" : "n"); |
| DRM_DEBUG_DRIVER("has subslice power gating: %s\n", |
| info->has_subslice_pg ? "y" : "n"); |
| DRM_DEBUG_DRIVER("has EU power gating: %s\n", |
| info->has_eu_pg ? "y" : "n"); |
| } |