From 2917e17b5fd25447a702e79f4ecba3e3b3e08d58 Mon Sep 17 00:00:00 2001 From: Sk Anirban Date: Thu, 13 Nov 2025 00:21:55 +0530 Subject: [PATCH] drm/xe/guc: Eliminate RPe caching for SLPC parameter handling RPe is runtime-determined by PCODE and caching it caused stale values, leading to incorrect GuC SLPC parameter settings. Drop the cached rpe_freq field and query fresh values from hardware on each use to ensure GuC SLPC parameters reflect current RPe. v2: Remove cached RPe frequency field (Rodrigo) v3: Remove extra variable (Vinay) Modify function name (Vinay) v4: Maintain a separate function for PVC (Rodrigo) v5: Avoid RPn update while fetching RPe frequency (Rodrigo) v6: Split platform-specific RPe comments (Vinay) Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5166 Signed-off-by: Sk Anirban Reviewed-by: Vinay Belgaumkar Link: https://patch.msgid.link/20251112185153.3593145-5-sk.anirban@intel.com Signed-off-by: Rodrigo Vivi --- drivers/gpu/drm/xe/xe_guc_pc.c | 61 +++++++++++++++------------- drivers/gpu/drm/xe/xe_guc_pc_types.h | 2 - 2 files changed, 32 insertions(+), 31 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c index ff22235857f88..4c48115f17951 100644 --- a/drivers/gpu/drm/xe/xe_guc_pc.c +++ b/drivers/gpu/drm/xe/xe_guc_pc.c @@ -331,7 +331,7 @@ static int pc_set_min_freq(struct xe_guc_pc *pc, u32 freq) * Our goal is to have the admin choices respected. */ pc_action_set_param(pc, SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY, - freq < pc->rpe_freq); + freq < xe_guc_pc_get_rpe_freq(pc)); return pc_action_set_param(pc, SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ, @@ -376,7 +376,7 @@ static void mtl_update_rpa_value(struct xe_guc_pc *pc) pc->rpa_freq = decode_freq(REG_FIELD_GET(MTL_RPA_MASK, reg)); } -static void mtl_update_rpe_value(struct xe_guc_pc *pc) +static u32 mtl_get_rpe_freq(struct xe_guc_pc *pc) { struct xe_gt *gt = pc_to_gt(pc); u32 reg; @@ -386,7 +386,7 @@ static void mtl_update_rpe_value(struct xe_guc_pc *pc) else reg = xe_mmio_read32(>->mmio, MTL_GT_RPE_FREQUENCY); - pc->rpe_freq = decode_freq(REG_FIELD_GET(MTL_RPE_MASK, reg)); + return decode_freq(REG_FIELD_GET(MTL_RPE_MASK, reg)); } static void tgl_update_rpa_value(struct xe_guc_pc *pc) @@ -409,24 +409,29 @@ static void tgl_update_rpa_value(struct xe_guc_pc *pc) } } -static void tgl_update_rpe_value(struct xe_guc_pc *pc) +static u32 pvc_get_rpe_freq(struct xe_guc_pc *pc) { struct xe_gt *gt = pc_to_gt(pc); - struct xe_device *xe = gt_to_xe(gt); u32 reg; /* * For PVC we still need to use fused RP1 as the approximation for RPe - * For other platforms than PVC we get the resolved RPe directly from + */ + reg = xe_mmio_read32(>->mmio, PVC_RP_STATE_CAP); + return REG_FIELD_GET(RP1_MASK, reg) * GT_FREQUENCY_MULTIPLIER; +} + +static u32 tgl_get_rpe_freq(struct xe_guc_pc *pc) +{ + struct xe_gt *gt = pc_to_gt(pc); + u32 reg; + + /* + * For other platforms than PVC, we get the resolved RPe directly from * PCODE at a different register */ - if (xe->info.platform == XE_PVC) { - reg = xe_mmio_read32(>->mmio, PVC_RP_STATE_CAP); - pc->rpe_freq = REG_FIELD_GET(RP1_MASK, reg) * GT_FREQUENCY_MULTIPLIER; - } else { - reg = xe_mmio_read32(>->mmio, FREQ_INFO_REC); - pc->rpe_freq = REG_FIELD_GET(RPE_MASK, reg) * GT_FREQUENCY_MULTIPLIER; - } + reg = xe_mmio_read32(>->mmio, FREQ_INFO_REC); + return REG_FIELD_GET(RPE_MASK, reg) * GT_FREQUENCY_MULTIPLIER; } static void pc_update_rp_values(struct xe_guc_pc *pc) @@ -434,20 +439,10 @@ static void pc_update_rp_values(struct xe_guc_pc *pc) struct xe_gt *gt = pc_to_gt(pc); struct xe_device *xe = gt_to_xe(gt); - if (GRAPHICS_VERx100(xe) >= 1270) { + if (GRAPHICS_VERx100(xe) >= 1270) mtl_update_rpa_value(pc); - mtl_update_rpe_value(pc); - } else { + else tgl_update_rpa_value(pc); - tgl_update_rpe_value(pc); - } - - /* - * RPe is decided at runtime by PCODE. In the rare case where that's - * smaller than the fused min, we will trust the PCODE and use that - * as our minimum one. - */ - pc->rpn_freq = min(pc->rpn_freq, pc->rpe_freq); } /** @@ -561,9 +556,17 @@ u32 xe_guc_pc_get_rpa_freq(struct xe_guc_pc *pc) */ u32 xe_guc_pc_get_rpe_freq(struct xe_guc_pc *pc) { - pc_update_rp_values(pc); + struct xe_device *xe = pc_to_xe(pc); + u32 freq; - return pc->rpe_freq; + if (GRAPHICS_VERx100(xe) == 1260) + freq = pvc_get_rpe_freq(pc); + else if (GRAPHICS_VERx100(xe) >= 1270) + freq = mtl_get_rpe_freq(pc); + else + freq = tgl_get_rpe_freq(pc); + + return freq; } /** @@ -1022,7 +1025,7 @@ static int pc_set_mert_freq_cap(struct xe_guc_pc *pc) /* * Ensure min and max are bound by MERT_FREQ_CAP until driver loads. */ - ret = pc_set_min_freq(pc, min(pc->rpe_freq, pc_max_freq_cap(pc))); + ret = pc_set_min_freq(pc, min(xe_guc_pc_get_rpe_freq(pc), pc_max_freq_cap(pc))); if (!ret) ret = pc_set_max_freq(pc, min(pc->rp0_freq, pc_max_freq_cap(pc))); @@ -1340,7 +1343,7 @@ static void xe_guc_pc_fini_hw(void *arg) XE_WARN_ON(xe_guc_pc_stop(pc)); /* Bind requested freq to mert_freq_cap before unload */ - pc_set_cur_freq(pc, min(pc_max_freq_cap(pc), pc->rpe_freq)); + pc_set_cur_freq(pc, min(pc_max_freq_cap(pc), xe_guc_pc_get_rpe_freq(pc))); xe_force_wake_put(gt_to_fw(pc_to_gt(pc)), fw_ref); } diff --git a/drivers/gpu/drm/xe/xe_guc_pc_types.h b/drivers/gpu/drm/xe/xe_guc_pc_types.h index 5e4ea53fbee6e..f27c05d817065 100644 --- a/drivers/gpu/drm/xe/xe_guc_pc_types.h +++ b/drivers/gpu/drm/xe/xe_guc_pc_types.h @@ -21,8 +21,6 @@ struct xe_guc_pc { u32 rp0_freq; /** @rpa_freq: HW RPa frequency - The Achievable one */ u32 rpa_freq; - /** @rpe_freq: HW RPe frequency - The Efficient one */ - u32 rpe_freq; /** @rpn_freq: HW RPN frequency - The Minimum one */ u32 rpn_freq; /** @user_requested_min: Stash the minimum requested freq by user */ -- 2.47.3