From patchwork Mon Mar 14 23:42:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Roper X-Patchwork-Id: 12780881 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 562DBC433EF for ; Mon, 14 Mar 2022 23:42:21 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1EA9689FA7; Mon, 14 Mar 2022 23:42:12 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id B2AB189F41; Mon, 14 Mar 2022 23:42:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647301330; x=1678837330; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iCSV1PGFZOfB6VoZy4YQ57QUG/GBTE2Llif6Q6XPZno=; b=PZxH51t2TtE3dt6MiUTlI4fTUL9diTp1lBQhy3qpXBACt6V4FNMXGXQK UP9G6ZQR56EFN2VjIfzgjsNoZ750VMiwtQ5IgqBVA9gSrHZ44RqC/S2Ir 7AkG4CTiT8BG5oNVRG4yu8v2J1Qy0yB33g6IraA4TRofKyGy+PZaDVpBT UiZMFXfJIdWhVrIDPzk++EKRqgJ5esR45SUZbP5SlJkk5VZX+s200XwET nCxHtoPk9SgJbtr5HFKRsZ6MkWhL9L4fQcZ+eJz6F4Ls1bW9NeuVEur5M jHjOXBMrFj62IjQuyLw0aBB0KNxVUo2u8Qy+IOMTeT/VlENJuxWPZMbA7 w==; X-IronPort-AV: E=McAfee;i="6200,9189,10286"; a="256359967" X-IronPort-AV: E=Sophos;i="5.90,181,1643702400"; d="scan'208";a="256359967" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2022 16:42:09 -0700 X-IronPort-AV: E=Sophos;i="5.90,181,1643702400"; d="scan'208";a="549403061" Received: from mdroper-desk1.fm.intel.com ([10.1.27.134]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2022 16:42:09 -0700 From: Matt Roper To: intel-gfx@lists.freedesktop.org Subject: [PATCH 1/3] drm/i915: Report steering details in debugfs Date: Mon, 14 Mar 2022 16:42:01 -0700 Message-Id: <20220314234203.799268-2-matthew.d.roper@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220314234203.799268-1-matthew.d.roper@intel.com> References: <20220314234203.799268-1-matthew.d.roper@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniele Ceraolo Spurio , dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a new 'steering' node in each gt's debugfs directory that tells whether we're using explicit steering for various types of MCR ranges and, if so, what MMIO ranges it applies to. We're going to be transitioning away from implicit steering, even for slice/dss steering soon, so the information reported here will become increasingly valuable once that happens. Cc: Daniele Ceraolo Spurio Signed-off-by: Matt Roper Reported-by: kernel test robot --- drivers/gpu/drm/i915/gt/intel_gt.c | 46 +++++++++++++++++++++ drivers/gpu/drm/i915/gt/intel_gt.h | 2 + drivers/gpu/drm/i915/gt/intel_gt_debugfs.c | 13 ++++++ drivers/gpu/drm/i915/gt/intel_gt_types.h | 5 +++ drivers/gpu/drm/i915/gt/intel_workarounds.c | 8 +++- 5 files changed, 73 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c index 8a2483ccbfb9..041add4019fc 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -96,6 +96,12 @@ int intel_gt_assign_ggtt(struct intel_gt *gt) return gt->ggtt ? 0 : -ENOMEM; } +const char *intel_steering_types[] = { + "L3BANK", + "MSLICE", + "LNCF", +}; + static const struct intel_mmio_range icl_l3bank_steering_table[] = { { 0x00B100, 0x00B3FF }, {}, @@ -932,6 +938,46 @@ u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg) return intel_uncore_read(gt->uncore, reg); } +static void report_steering_type(struct drm_printer *p, + struct intel_gt *gt, + enum intel_steering_type type, + bool dump_table) +{ + const struct intel_mmio_range *entry; + u8 slice, subslice; + + BUILD_BUG_ON(ARRAY_SIZE(intel_steering_types) != NUM_STEERING_TYPES); + + if (!gt->steering_table[type]) { + drm_printf(p, "%s steering: uses default steering\n", + intel_steering_types[type]); + return; + } + + intel_gt_get_valid_steering(gt, type, &slice, &subslice); + drm_printf(p, "%s steering: sliceid=0x%x, subsliceid=0x%x\n", + intel_steering_types[type], slice, subslice); + + if (!dump_table) + return; + + for (entry = gt->steering_table[type]; entry->end; entry++) + drm_printf(p, "\t0x%06x - 0x%06x\n", entry->start, entry->end); +} + +void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt, + bool dump_table) +{ + drm_printf(p, "Default steering: sliceid=0x%x, subsliceid=0x%x\n", + gt->default_steering.groupid, + gt->default_steering.instanceid); + + if (HAS_MSLICES(gt->i915)) { + report_steering_type(p, gt, MSLICE, dump_table); + report_steering_type(p, gt, LNCF, dump_table); + } +} + void intel_gt_info_print(const struct intel_gt_info *info, struct drm_printer *p) { diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h index 0f571c8ee22b..3edece1865e4 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.h +++ b/drivers/gpu/drm/i915/gt/intel_gt.h @@ -87,6 +87,8 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt, u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg); u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg); +void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt, + bool dump_table); void intel_gt_info_print(const struct intel_gt_info *info, struct drm_printer *p); diff --git a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c index f103664b71d4..6f45b131a001 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c @@ -6,6 +6,7 @@ #include #include "i915_drv.h" +#include "intel_gt.h" #include "intel_gt_debugfs.h" #include "intel_gt_engines_debugfs.h" #include "intel_gt_pm_debugfs.h" @@ -57,10 +58,22 @@ static int __intel_gt_debugfs_reset_store(void *data, u64 val) DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show, __intel_gt_debugfs_reset_store, "%llu\n"); +static int steering_show(struct seq_file *m, void *data) +{ + struct drm_printer p = drm_seq_file_printer(m); + struct intel_gt *gt = m->private; + + intel_gt_report_steering(&p, gt, true); + + return 0; +} +DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(steering); + static void gt_debugfs_register(struct intel_gt *gt, struct dentry *root) { static const struct intel_gt_debugfs_file files[] = { { "reset", &reset_fops, NULL }, + { "steering", &steering_fops }, }; intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt); diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h index f20687796490..7781ab84e7a3 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h @@ -182,6 +182,11 @@ struct intel_gt { const struct intel_mmio_range *steering_table[NUM_STEERING_TYPES]; + struct { + u8 groupid; + u8 instanceid; + } default_steering; + struct intel_gt_info { intel_engine_mask_t engine_mask; diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c index beca8735bae5..c328d46f8095 100644 --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c @@ -1072,9 +1072,15 @@ static void __set_mcr_steering(struct i915_wa_list *wal, static void __add_mcr_wa(struct intel_gt *gt, struct i915_wa_list *wal, unsigned int slice, unsigned int subslice) { - drm_dbg(>->i915->drm, "MCR slice=0x%x, subslice=0x%x\n", slice, subslice); + struct drm_printer p = drm_debug_printer("MCR Steering:"); __set_mcr_steering(wal, GEN8_MCR_SELECTOR, slice, subslice); + + gt->default_steering.groupid = slice; + gt->default_steering.instanceid = subslice; + + if (drm_debug_enabled(DRM_UT_DRIVER)) + intel_gt_report_steering(&p, gt, false); } static void From patchwork Mon Mar 14 23:42:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Roper X-Patchwork-Id: 12780882 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BF636C433F5 for ; Mon, 14 Mar 2022 23:42:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1C68810E1D4; 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14 Mar 2022 16:42:09 -0700 X-IronPort-AV: E=Sophos;i="5.90,181,1643702400"; d="scan'208";a="549403064" Received: from mdroper-desk1.fm.intel.com ([10.1.27.134]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2022 16:42:09 -0700 From: Matt Roper To: intel-gfx@lists.freedesktop.org Subject: [PATCH 2/3] drm/i915/guc: add steering info to GuC register save/restore list Date: Mon, 14 Mar 2022 16:42:02 -0700 Message-Id: <20220314234203.799268-3-matthew.d.roper@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220314234203.799268-1-matthew.d.roper@intel.com> References: <20220314234203.799268-1-matthew.d.roper@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniele Ceraolo Spurio , John Harrison , dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Daniele Ceraolo Spurio GuC has its own steering mechanism and can't use the default set by i915, so we need to provide the steering information that the FW will need to save/restore registers while processing an engine reset. The GUC interface allows us to do so as part of the register save/restore list and it requires us to specify the steering for all multicast register, even those that would be covered by the default setting for cpu access. Given that we do not distinguish between registers that do not need steering and registers that are guaranteed to work the default steering, we set the steering for all entries in the guc list that do not require a special steering (e.g. mslice) to the default settings; this will cost us a few extra writes during engine reset but allows us to keep the steering logic simple. Cc: John Harrison Cc: Matt Roper Signed-off-by: Daniele Ceraolo Spurio Signed-off-by: Matt Roper Reviewed-by: Lucas De Marchi --- drivers/gpu/drm/i915/gt/intel_gt.c | 29 +++++++++++ drivers/gpu/drm/i915/gt/intel_gt.h | 3 ++ drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c | 54 +++++++++++++++------ drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 3 ++ 4 files changed, 73 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c index 041add4019fc..a5f01a8601e1 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -919,6 +919,35 @@ u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg) return intel_uncore_read_fw(gt->uncore, reg); } +/** + * intel_gt_get_valid_steering_for_reg - get a valid steering for a register + * @gt: GT structure + * @reg: register for which the steering is required + * @sliceid: return variable for slice steering + * @subsliceid: return variable for subslice steering + * + * This function returns a slice/subslice pair that is guaranteed to work for + * read steering of the given register. Note that a value will be returned even + * if the register is not replicated and therefore does not actually require + * steering. + */ +void intel_gt_get_valid_steering_for_reg(struct intel_gt *gt, i915_reg_t reg, + u8 *sliceid, u8 *subsliceid) +{ + int type; + + for (type = 0; type < NUM_STEERING_TYPES; type++) { + if (intel_gt_reg_needs_read_steering(gt, reg, type)) { + intel_gt_get_valid_steering(gt, type, sliceid, + subsliceid); + return; + } + } + + *sliceid = gt->default_steering.groupid; + *subsliceid = gt->default_steering.instanceid; +} + u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg) { int type; diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h index 3edece1865e4..996f8f3c17b9 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.h +++ b/drivers/gpu/drm/i915/gt/intel_gt.h @@ -84,6 +84,9 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt, return gt->steering_table[type]; } +void intel_gt_get_valid_steering_for_reg(struct intel_gt *gt, i915_reg_t reg, + u8 *sliceid, u8 *subsliceid); + u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg); u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg); diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c index acc4a3766dc1..feb372fc0b48 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c @@ -276,15 +276,24 @@ __mmio_reg_add(struct temp_regset *regset, struct guc_mmio_reg *reg) return slot; } -static long __must_check guc_mmio_reg_add(struct temp_regset *regset, - u32 offset, u32 flags) +#define GUC_REGSET_STEERING(group, instance) ( \ + FIELD_PREP(GUC_REGSET_STEERING_GROUP, (group)) | \ + FIELD_PREP(GUC_REGSET_STEERING_INSTANCE, (instance)) | \ + GUC_REGSET_NEEDS_STEERING \ +) + +static long __must_check guc_mmio_reg_add(struct intel_gt *gt, + struct temp_regset *regset, + i915_reg_t reg, u32 flags) { u32 count = regset->storage_used - (regset->registers - regset->storage); - struct guc_mmio_reg reg = { + u32 offset = i915_mmio_reg_offset(reg); + struct guc_mmio_reg entry = { .offset = offset, .flags = flags, }; struct guc_mmio_reg *slot; + u8 group, inst; /* * The mmio list is built using separate lists within the driver. @@ -292,11 +301,22 @@ static long __must_check guc_mmio_reg_add(struct temp_regset *regset, * register more than once. Do not consider this an error; silently * move on if the register is already in the list. */ - if (bsearch(®, regset->registers, count, - sizeof(reg), guc_mmio_reg_cmp)) + if (bsearch(&entry, regset->registers, count, + sizeof(entry), guc_mmio_reg_cmp)) return 0; - slot = __mmio_reg_add(regset, ®); + /* + * The GuC doesn't have a default steering, so we need to explicitly + * steer all registers that need steering. However, we do not keep track + * of all the steering ranges, only of those that have a chance of using + * a non-default steering from the i915 pov. Instead of adding such + * tracking, it is easier to just program the default steering for all + * regs that don't need a non-default one. + */ + intel_gt_get_valid_steering_for_reg(gt, reg, &group, &inst); + entry.flags |= GUC_REGSET_STEERING(group, inst); + + slot = __mmio_reg_add(regset, &entry); if (IS_ERR(slot)) return PTR_ERR(slot); @@ -311,14 +331,16 @@ static long __must_check guc_mmio_reg_add(struct temp_regset *regset, return 0; } -#define GUC_MMIO_REG_ADD(regset, reg, masked) \ - guc_mmio_reg_add(regset, \ - i915_mmio_reg_offset((reg)), \ +#define GUC_MMIO_REG_ADD(gt, regset, reg, masked) \ + guc_mmio_reg_add(gt, \ + regset, \ + (reg), \ (masked) ? GUC_REGSET_MASKED : 0) static int guc_mmio_regset_init(struct temp_regset *regset, struct intel_engine_cs *engine) { + struct intel_gt *gt = engine->gt; const u32 base = engine->mmio_base; struct i915_wa_list *wal = &engine->wa_list; struct i915_wa *wa; @@ -331,26 +353,26 @@ static int guc_mmio_regset_init(struct temp_regset *regset, */ regset->registers = regset->storage + regset->storage_used; - ret |= GUC_MMIO_REG_ADD(regset, RING_MODE_GEN7(base), true); - ret |= GUC_MMIO_REG_ADD(regset, RING_HWS_PGA(base), false); - ret |= GUC_MMIO_REG_ADD(regset, RING_IMR(base), false); + ret |= GUC_MMIO_REG_ADD(gt, regset, RING_MODE_GEN7(base), true); + ret |= GUC_MMIO_REG_ADD(gt, regset, RING_HWS_PGA(base), false); + ret |= GUC_MMIO_REG_ADD(gt, regset, RING_IMR(base), false); if ((engine->flags & I915_ENGINE_FIRST_RENDER_COMPUTE) && CCS_MASK(engine->gt)) - ret |= GUC_MMIO_REG_ADD(regset, GEN12_RCU_MODE, true); + ret |= GUC_MMIO_REG_ADD(gt, regset, GEN12_RCU_MODE, true); for (i = 0, wa = wal->list; i < wal->count; i++, wa++) - ret |= GUC_MMIO_REG_ADD(regset, wa->reg, wa->masked_reg); + ret |= GUC_MMIO_REG_ADD(gt, regset, wa->reg, wa->masked_reg); /* Be extra paranoid and include all whitelist registers. */ for (i = 0; i < RING_MAX_NONPRIV_SLOTS; i++) - ret |= GUC_MMIO_REG_ADD(regset, + ret |= GUC_MMIO_REG_ADD(gt, regset, RING_FORCE_TO_NONPRIV(base, i), false); /* add in local MOCS registers */ for (i = 0; i < GEN9_LNCFCMOCS_REG_COUNT; i++) - ret |= GUC_MMIO_REG_ADD(regset, GEN9_LNCFCMOCS(i), false); + ret |= GUC_MMIO_REG_ADD(gt, regset, GEN9_LNCFCMOCS(i), false); return ret ? -1 : 0; } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h index a4a6136b3616..78590372b85f 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h @@ -287,8 +287,11 @@ struct guc_mmio_reg { u32 flags; u32 mask; #define GUC_REGSET_MASKED BIT(0) +#define GUC_REGSET_NEEDS_STEERING BIT(1) #define GUC_REGSET_MASKED_WITH_VALUE BIT(2) #define GUC_REGSET_RESTORE_ONLY BIT(3) +#define GUC_REGSET_STEERING_GROUP GENMASK(15, 12) +#define GUC_REGSET_STEERING_INSTANCE GENMASK(23, 20) } __packed; /* GuC register sets */ From patchwork Mon Mar 14 23:42:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Roper X-Patchwork-Id: 12780883 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5C252C433EF for ; Mon, 14 Mar 2022 23:42:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 85A7210E1D7; Mon, 14 Mar 2022 23:42:15 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8142789F8B; Mon, 14 Mar 2022 23:42:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647301330; x=1678837330; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=OizfX+XKo6M/lAi36LbJP+jiDe/BkdnpLNiwldVZxEs=; b=FEGQjle5o46PlnQ5l6HS4oSoAl3FBTYJB+zCC3susvI24NpVjTK0WtdN zq1I9SL7/ybFHDcEzqBkU3UTzB6ZR4FBOssLeWf1Bjrx/PEqKwUHR36rT MNaeCtN4oXqmistxCx+wZJBd3EomU5UGHiENoPurfTL5DBOxIreamFsgV uyzxBzVtKP/7NPCdBM4jyvianzevWa5d9c9kzdMihfSQ5PdlEuCkC6pqM ZGmFpccBLYJcR9XZ9kinyT2aBdfLjzTDURKJzRbDTPXad0V2HkZ6R1mbj Cb1eCUJVRcazppJaDh1hFtv8u1sQMiRLpVD5XX0TJygT1ncsNP2qOCT9y w==; X-IronPort-AV: E=McAfee;i="6200,9189,10286"; a="256359969" X-IronPort-AV: E=Sophos;i="5.90,181,1643702400"; d="scan'208";a="256359969" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2022 16:42:09 -0700 X-IronPort-AV: E=Sophos;i="5.90,181,1643702400"; d="scan'208";a="549403066" Received: from mdroper-desk1.fm.intel.com ([10.1.27.134]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2022 16:42:09 -0700 From: Matt Roper To: intel-gfx@lists.freedesktop.org Subject: [PATCH 3/3] drm/i915: Add support for steered register writes Date: Mon, 14 Mar 2022 16:42:03 -0700 Message-Id: <20220314234203.799268-4-matthew.d.roper@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220314234203.799268-1-matthew.d.roper@intel.com> References: <20220314234203.799268-1-matthew.d.roper@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Harish Chegondi , dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Upcoming patches will need to steer writes to multicast registers as well as reading them. Although the setting of the 'multicast' bit should only really matter for write operations (reads always operate in a unicast manner and give us the result from one specific instance), Wa_22013088509 suggests that we leave the multicast bit enabled when performing read operations, so we follow suit here. Cc: Harish Chegondi Signed-off-by: Matt Roper Reviewed-by: Lucas De Marchi --- drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 + drivers/gpu/drm/i915/intel_uncore.c | 75 ++++++++++++++++++++++--- drivers/gpu/drm/i915/intel_uncore.h | 4 +- 3 files changed, 70 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h index 19cd34f24263..62e0f075b1de 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -46,6 +46,7 @@ #define GEN8_MCR_SLICE_MASK GEN8_MCR_SLICE(3) #define GEN8_MCR_SUBSLICE(subslice) (((subslice) & 3) << 24) #define GEN8_MCR_SUBSLICE_MASK GEN8_MCR_SUBSLICE(3) +#define GEN11_MCR_MULTICAST REG_BIT(31) #define GEN11_MCR_SLICE(slice) (((slice) & 0xf) << 27) #define GEN11_MCR_SLICE_MASK GEN11_MCR_SLICE(0xf) #define GEN11_MCR_SUBSLICE(subslice) (((subslice) & 0x7) << 24) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index dd8fdd5863de..ef8ffc01ad19 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -2464,17 +2464,46 @@ intel_uncore_forcewake_for_reg(struct intel_uncore *uncore, return fw_domains; } -u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore, - i915_reg_t reg, - int slice, int subslice) +/** + * uncore_rw_with_mcr_steering_fw - Access a register after programming + * the MCR selector register. + * @uncore: pointer to struct intel_uncore + * @reg: register being accessed + * @rw_flag: FW_REG_READ for read access or FW_REG_WRITE for write access + * @slice: slice number (ignored for multi-cast write) + * @subslice: sub-slice number (ignored for multi-cast write) + * @value: register value to be written (ignored for read) + * + * Return: 0 for write access. register value for read access. + * + * Caller needs to make sure the relevant forcewake wells are up. + */ +static u32 uncore_rw_with_mcr_steering_fw(struct intel_uncore *uncore, + i915_reg_t reg, u8 rw_flag, + int slice, int subslice, u32 value) { - u32 mcr_mask, mcr_ss, mcr, old_mcr, val; + u32 mcr_mask, mcr_ss, mcr, old_mcr, val = 0; lockdep_assert_held(&uncore->lock); if (GRAPHICS_VER(uncore->i915) >= 11) { mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK; mcr_ss = GEN11_MCR_SLICE(slice) | GEN11_MCR_SUBSLICE(subslice); + + /* + * Wa_22013088509 + * + * The setting of the multicast/unicast bit usually wouldn't + * matter for read operations (which always return the value + * from a single register instance regardless of how that bit + * is set), but some platforms have a workaround requiring us + * to remain in multicast mode for reads. There's no real + * downside to this, so we'll just go ahead and do so on all + * platforms; we'll only clear the multicast bit from the mask + * when exlicitly doing a write operation. + */ + if (rw_flag == FW_REG_WRITE) + mcr_mask |= GEN11_MCR_MULTICAST; } else { mcr_mask = GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK; mcr_ss = GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice); @@ -2486,7 +2515,10 @@ u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore, mcr |= mcr_ss; intel_uncore_write_fw(uncore, GEN8_MCR_SELECTOR, mcr); - val = intel_uncore_read_fw(uncore, reg); + if (rw_flag == FW_REG_READ) + val = intel_uncore_read_fw(uncore, reg); + else + intel_uncore_write_fw(uncore, reg, value); mcr &= ~mcr_mask; mcr |= old_mcr & mcr_mask; @@ -2496,14 +2528,16 @@ u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore, return val; } -u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore, - i915_reg_t reg, int slice, int subslice) +static u32 uncore_rw_with_mcr_steering(struct intel_uncore *uncore, + i915_reg_t reg, u8 rw_flag, + int slice, int subslice, + u32 value) { enum forcewake_domains fw_domains; u32 val; fw_domains = intel_uncore_forcewake_for_reg(uncore, reg, - FW_REG_READ); + rw_flag); fw_domains |= intel_uncore_forcewake_for_reg(uncore, GEN8_MCR_SELECTOR, FW_REG_READ | FW_REG_WRITE); @@ -2511,7 +2545,8 @@ u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore, spin_lock_irq(&uncore->lock); intel_uncore_forcewake_get__locked(uncore, fw_domains); - val = intel_uncore_read_with_mcr_steering_fw(uncore, reg, slice, subslice); + val = uncore_rw_with_mcr_steering_fw(uncore, reg, rw_flag, + slice, subslice, value); intel_uncore_forcewake_put__locked(uncore, fw_domains); spin_unlock_irq(&uncore->lock); @@ -2519,6 +2554,28 @@ u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore, return val; } +u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore, + i915_reg_t reg, int slice, int subslice) +{ + return uncore_rw_with_mcr_steering_fw(uncore, reg, FW_REG_READ, + slice, subslice, 0); +} + +u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore, + i915_reg_t reg, int slice, int subslice) +{ + return uncore_rw_with_mcr_steering(uncore, reg, FW_REG_READ, + slice, subslice, 0); +} + +void intel_uncore_write_with_mcr_steering(struct intel_uncore *uncore, + i915_reg_t reg, u32 value, + int slice, int subslice) +{ + uncore_rw_with_mcr_steering(uncore, reg, FW_REG_WRITE, + slice, subslice, value); +} + #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/mock_uncore.c" #include "selftests/intel_uncore.c" diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h index 6ff56d673e2b..9a760952d46a 100644 --- a/drivers/gpu/drm/i915/intel_uncore.h +++ b/drivers/gpu/drm/i915/intel_uncore.h @@ -214,7 +214,9 @@ u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore, int slice, int subslice); u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore, i915_reg_t reg, int slice, int subslice); - +void intel_uncore_write_with_mcr_steering(struct intel_uncore *uncore, + i915_reg_t reg, u32 value, + int slice, int subslice); void intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug); void intel_uncore_init_early(struct intel_uncore *uncore,