drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2014-2019 Intel Corporation
   4  */
   5
   6 #include "gt/intel_gt.h"
   7 #include "intel_guc_ads.h"
   8 #include "intel_uc.h"
   9 #include "i915_drv.h"
  10
  11 /*
  12  * The Additional Data Struct (ADS) has pointers for different buffers used by
  13  * the GuC. One single gem object contains the ADS struct itself (guc_ads), the
  14  * scheduling policies (guc_policies), a structure describing a collection of
  15  * register sets (guc_mmio_reg_state) and some extra pages for the GuC to save
  16  * its internal state for sleep.
  17  */
  18
  19 static void guc_policy_init(struct guc_policy *policy)
  20 {
  21         policy->execution_quantum = POLICY_DEFAULT_EXECUTION_QUANTUM_US;
  22         policy->preemption_time = POLICY_DEFAULT_PREEMPTION_TIME_US;
  23         policy->fault_time = POLICY_DEFAULT_FAULT_TIME_US;
  24         policy->policy_flags = 0;
  25 }
  26
  27 static void guc_policies_init(struct guc_policies *policies)
  28 {
  29         struct guc_policy *policy;
  30         u32 p, i;
  31
  32         policies->dpc_promote_time = POLICY_DEFAULT_DPC_PROMOTE_TIME_US;
  33         policies->max_num_work_items = POLICY_MAX_NUM_WI;
  34
  35         for (p = 0; p < GUC_CLIENT_PRIORITY_NUM; p++) {
  36                 for (i = 0; i < GUC_MAX_ENGINE_CLASSES; i++) {
  37                         policy = &policies->policy[p][i];
  38
  39                         guc_policy_init(policy);
  40                 }
  41         }
  42
  43         policies->is_valid = 1;
  44 }
  45
  46 static void guc_ct_pool_entries_init(struct guc_ct_pool_entry *pool, u32 num)
  47 {
  48         memset(pool, 0, num * sizeof(*pool));
  49 }
  50
  51 /*
  52  * The first 80 dwords of the register state context, containing the
  53  * execlists and ppgtt registers.
  54  */
  55 #define LR_HW_CONTEXT_SIZE      (80 * sizeof(u32))
  56
  57 /* The ads obj includes the struct itself and buffers passed to GuC */
  58 struct __guc_ads_blob {
  59         struct guc_ads ads;
  60         struct guc_policies policies;
  61         struct guc_mmio_reg_state reg_state;
  62         struct guc_gt_system_info system_info;
  63         struct guc_clients_info clients_info;
  64         struct guc_ct_pool_entry ct_pool[GUC_CT_POOL_SIZE];
  65         u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
  66 } __packed;
  67
  68 static void __guc_ads_init(struct intel_guc *guc)
  69 {
  70         struct drm_i915_private *dev_priv = guc_to_gt(guc)->i915;
  71         struct __guc_ads_blob *blob = guc->ads_blob;
  72         const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
  73         u32 base;
  74         u8 engine_class;
  75
  76         /* GuC scheduling policies */
  77         guc_policies_init(&blob->policies);
  78
  79         /*
  80          * GuC expects a per-engine-class context image and size
  81          * (minus hwsp and ring context). The context image will be
  82          * used to reinitialize engines after a reset. It must exist
  83          * and be pinned in the GGTT, so that the address won't change after
  84          * we have told GuC where to find it. The context size will be used
  85          * to validate that the LRC base + size fall within allowed GGTT.
  86          */
  87         for (engine_class = 0; engine_class <= MAX_ENGINE_CLASS; ++engine_class) {
  88                 if (engine_class == OTHER_CLASS)
  89                         continue;
  90                 /*
  91                  * TODO: Set context pointer to default state to allow
  92                  * GuC to re-init guilty contexts after internal reset.
  93                  */
  94                 blob->ads.golden_context_lrca[engine_class] = 0;
  95                 blob->ads.eng_state_size[engine_class] =
  96                         intel_engine_context_size(guc_to_gt(guc),
  97                                                   engine_class) -
  98                         skipped_size;
  99         }
 100
 101         /* System info */
 102         blob->system_info.slice_enabled = hweight8(RUNTIME_INFO(dev_priv)->sseu.slice_mask);
 103         blob->system_info.rcs_enabled = 1;
 104         blob->system_info.bcs_enabled = 1;
 105
 106         blob->system_info.vdbox_enable_mask = VDBOX_MASK(dev_priv);
 107         blob->system_info.vebox_enable_mask = VEBOX_MASK(dev_priv);
 108         blob->system_info.vdbox_sfc_support_mask = RUNTIME_INFO(dev_priv)->vdbox_sfc_access;
 109
 110         base = intel_guc_ggtt_offset(guc, guc->ads_vma);
 111
 112         /* Clients info  */
 113         guc_ct_pool_entries_init(blob->ct_pool, ARRAY_SIZE(blob->ct_pool));
 114
 115         blob->clients_info.clients_num = 1;
 116         blob->clients_info.ct_pool_addr = base + ptr_offset(blob, ct_pool);
 117         blob->clients_info.ct_pool_count = ARRAY_SIZE(blob->ct_pool);
 118
 119         /* ADS */
 120         blob->ads.scheduler_policies = base + ptr_offset(blob, policies);
 121         blob->ads.reg_state_buffer = base + ptr_offset(blob, reg_state_buffer);
 122         blob->ads.reg_state_addr = base + ptr_offset(blob, reg_state);
 123         blob->ads.gt_system_info = base + ptr_offset(blob, system_info);
 124         blob->ads.clients_info = base + ptr_offset(blob, clients_info);
 125
 126         i915_gem_object_flush_map(guc->ads_vma->obj);
 127 }
 128
 129 /**
 130  * intel_guc_ads_create() - allocates and initializes GuC ADS.
 131  * @guc: intel_guc struct
 132  *
 133  * GuC needs memory block (Additional Data Struct), where it will store
 134  * some data. Allocate and initialize such memory block for GuC use.
 135  */
 136 int intel_guc_ads_create(struct intel_guc *guc)
 137 {
 138         const u32 size = PAGE_ALIGN(sizeof(struct __guc_ads_blob));
 139         int ret;
 140
 141         GEM_BUG_ON(guc->ads_vma);
 142
 143         ret = intel_guc_allocate_and_map_vma(guc, size, &guc->ads_vma,
 144                                              (void **)&guc->ads_blob);
 145
 146         if (ret)
 147                 return ret;
 148
 149         __guc_ads_init(guc);
 150
 151         return 0;
 152 }
 153
 154 void intel_guc_ads_destroy(struct intel_guc *guc)
 155 {
 156         i915_vma_unpin_and_release(&guc->ads_vma, I915_VMA_RELEASE_MAP);
 157 }
 158
 159 /**
 160  * intel_guc_ads_reset() - prepares GuC Additional Data Struct for reuse
 161  * @guc: intel_guc struct
 162  *
 163  * GuC stores some data in ADS, which might be stale after a reset.
 164  * Reinitialize whole ADS in case any part of it was corrupted during
 165  * previous GuC run.
 166  */
 167 void intel_guc_ads_reset(struct intel_guc *guc)
 168 {
 169         if (!guc->ads_vma)
 170                 return;
 171         __guc_ads_init(guc);
 172 }