drivers/gpu/drm/i915/display/intel_dpt.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2021 Intel Corporation
   4  */
   5
   6 #include "gem/i915_gem_domain.h"
   7 #include "gem/i915_gem_internal.h"
   8 #include "gem/i915_gem_lmem.h"
   9 #include "gt/gen8_ppgtt.h"
  10
  11 #include "i915_drv.h"
  12 #include "intel_display_types.h"
  13 #include "intel_dpt.h"
  14 #include "intel_fb.h"
  15
  16 struct i915_dpt {
  17         struct i915_address_space vm;
  18
  19         struct drm_i915_gem_object *obj;
  20         struct i915_vma *vma;
  21         void __iomem *iomem;
  22 };
  23
  24 #define i915_is_dpt(vm) ((vm)->is_dpt)
  25
  26 static inline struct i915_dpt *
  27 i915_vm_to_dpt(struct i915_address_space *vm)
  28 {
  29         BUILD_BUG_ON(offsetof(struct i915_dpt, vm));
  30         drm_WARN_ON(&vm->i915->drm, !i915_is_dpt(vm));
  31         return container_of(vm, struct i915_dpt, vm);
  32 }
  33
  34 #define dpt_total_entries(dpt) ((dpt)->vm.total >> PAGE_SHIFT)
  35
  36 static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
  37 {
  38         writeq(pte, addr);
  39 }
  40
  41 static void dpt_insert_page(struct i915_address_space *vm,
  42                             dma_addr_t addr,
  43                             u64 offset,
  44                             unsigned int pat_index,
  45                             u32 flags)
  46 {
  47         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
  48         gen8_pte_t __iomem *base = dpt->iomem;
  49
  50         gen8_set_pte(base + offset / I915_GTT_PAGE_SIZE,
  51                      vm->pte_encode(addr, pat_index, flags));
  52 }
  53
  54 static void dpt_insert_entries(struct i915_address_space *vm,
  55                                struct i915_vma_resource *vma_res,
  56                                unsigned int pat_index,
  57                                u32 flags)
  58 {
  59         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
  60         gen8_pte_t __iomem *base = dpt->iomem;
  61         const gen8_pte_t pte_encode = vm->pte_encode(0, pat_index, flags);
  62         struct sgt_iter sgt_iter;
  63         dma_addr_t addr;
  64         int i;
  65
  66         /*
  67          * Note that we ignore PTE_READ_ONLY here. The caller must be careful
  68          * not to allow the user to override access to a read only page.
  69          */
  70
  71         i = vma_res->start / I915_GTT_PAGE_SIZE;
  72         for_each_sgt_daddr(addr, sgt_iter, vma_res->bi.pages)
  73                 gen8_set_pte(&base[i++], pte_encode | addr);
  74 }
  75
  76 static void dpt_clear_range(struct i915_address_space *vm,
  77                             u64 start, u64 length)
  78 {
  79 }
  80
  81 static void dpt_bind_vma(struct i915_address_space *vm,
  82                          struct i915_vm_pt_stash *stash,
  83                          struct i915_vma_resource *vma_res,
  84                          unsigned int pat_index,
  85                          u32 flags)
  86 {
  87         u32 pte_flags;
  88
  89         if (vma_res->bound_flags)
  90                 return;
  91
  92         /* Applicable to VLV (gen8+ do not support RO in the GGTT) */
  93         pte_flags = 0;
  94         if (vm->has_read_only && vma_res->bi.readonly)
  95                 pte_flags |= PTE_READ_ONLY;
  96         if (vma_res->bi.lmem)
  97                 pte_flags |= PTE_LM;
  98
  99         vm->insert_entries(vm, vma_res, pat_index, pte_flags);
 100
 101         vma_res->page_sizes_gtt = I915_GTT_PAGE_SIZE;
 102
 103         /*
 104          * Without aliasing PPGTT there's no difference between
 105          * GLOBAL/LOCAL_BIND, it's all the same ptes. Hence unconditionally
 106          * upgrade to both bound if we bind either to avoid double-binding.
 107          */
 108         vma_res->bound_flags = I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 109 }
 110
 111 static void dpt_unbind_vma(struct i915_address_space *vm,
 112                            struct i915_vma_resource *vma_res)
 113 {
 114         vm->clear_range(vm, vma_res->start, vma_res->vma_size);
 115 }
 116
 117 static void dpt_cleanup(struct i915_address_space *vm)
 118 {
 119         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
 120
 121         i915_gem_object_put(dpt->obj);
 122 }
 123
 124 struct i915_vma *intel_dpt_pin(struct i915_address_space *vm)
 125 {
 126         struct drm_i915_private *i915 = vm->i915;
 127         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
 128         intel_wakeref_t wakeref;
 129         struct i915_vma *vma;
 130         void __iomem *iomem;
 131         struct i915_gem_ww_ctx ww;
 132         u64 pin_flags = 0;
 133         int err;
 134
 135         if (i915_gem_object_is_stolen(dpt->obj))
 136                 pin_flags |= PIN_MAPPABLE;
 137
 138         wakeref = intel_runtime_pm_get(&i915->runtime_pm);
 139         atomic_inc(&i915->gpu_error.pending_fb_pin);
 140
 141         for_i915_gem_ww(&ww, err, true) {
 142                 err = i915_gem_object_lock(dpt->obj, &ww);
 143                 if (err)
 144                         continue;
 145
 146                 vma = i915_gem_object_ggtt_pin_ww(dpt->obj, &ww, NULL, 0, 4096,
 147                                                   pin_flags);
 148                 if (IS_ERR(vma)) {
 149                         err = PTR_ERR(vma);
 150                         continue;
 151                 }
 152
 153                 iomem = i915_vma_pin_iomap(vma);
 154                 i915_vma_unpin(vma);
 155
 156                 if (IS_ERR(iomem)) {
 157                         err = PTR_ERR(iomem);
 158                         continue;
 159                 }
 160
 161                 dpt->vma = vma;
 162                 dpt->iomem = iomem;
 163
 164                 i915_vma_get(vma);
 165         }
 166
 167         dpt->obj->mm.dirty = true;
 168
 169         atomic_dec(&i915->gpu_error.pending_fb_pin);
 170         intel_runtime_pm_put(&i915->runtime_pm, wakeref);
 171
 172         return err ? ERR_PTR(err) : vma;
 173 }
 174
 175 void intel_dpt_unpin(struct i915_address_space *vm)
 176 {
 177         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
 178
 179         i915_vma_unpin_iomap(dpt->vma);
 180         i915_vma_put(dpt->vma);
 181 }
 182
 183 /**
 184  * intel_dpt_resume - restore the memory mapping for all DPT FBs during system resume
 185  * @i915: device instance
 186  *
 187  * Restore the memory mapping during system resume for all framebuffers which
 188  * are mapped to HW via a GGTT->DPT page table. The content of these page
 189  * tables are not stored in the hibernation image during S4 and S3RST->S4
 190  * transitions, so here we reprogram the PTE entries in those tables.
 191  *
 192  * This function must be called after the mappings in GGTT have been restored calling
 193  * i915_ggtt_resume().
 194  */
 195 void intel_dpt_resume(struct drm_i915_private *i915)
 196 {
 197         struct drm_framebuffer *drm_fb;
 198
 199         if (!HAS_DISPLAY(i915))
 200                 return;
 201
 202         mutex_lock(&i915->drm.mode_config.fb_lock);
 203         drm_for_each_fb(drm_fb, &i915->drm) {
 204                 struct intel_framebuffer *fb = to_intel_framebuffer(drm_fb);
 205
 206                 if (fb->dpt_vm)
 207                         i915_ggtt_resume_vm(fb->dpt_vm);
 208         }
 209         mutex_unlock(&i915->drm.mode_config.fb_lock);
 210 }
 211
 212 /**
 213  * intel_dpt_suspend - suspend the memory mapping for all DPT FBs during system suspend
 214  * @i915: device instance
 215  *
 216  * Suspend the memory mapping during system suspend for all framebuffers which
 217  * are mapped to HW via a GGTT->DPT page table.
 218  *
 219  * This function must be called before the mappings in GGTT are suspended calling
 220  * i915_ggtt_suspend().
 221  */
 222 void intel_dpt_suspend(struct drm_i915_private *i915)
 223 {
 224         struct drm_framebuffer *drm_fb;
 225
 226         if (!HAS_DISPLAY(i915))
 227                 return;
 228
 229         mutex_lock(&i915->drm.mode_config.fb_lock);
 230
 231         drm_for_each_fb(drm_fb, &i915->drm) {
 232                 struct intel_framebuffer *fb = to_intel_framebuffer(drm_fb);
 233
 234                 if (fb->dpt_vm)
 235                         i915_ggtt_suspend_vm(fb->dpt_vm);
 236         }
 237
 238         mutex_unlock(&i915->drm.mode_config.fb_lock);
 239 }
 240
 241 struct i915_address_space *
 242 intel_dpt_create(struct intel_framebuffer *fb)
 243 {
 244         struct drm_gem_object *obj = &intel_fb_obj(&fb->base)->base;
 245         struct drm_i915_private *i915 = to_i915(obj->dev);
 246         struct drm_i915_gem_object *dpt_obj;
 247         struct i915_address_space *vm;
 248         struct i915_dpt *dpt;
 249         size_t size;
 250         int ret;
 251
 252         if (intel_fb_needs_pot_stride_remap(fb))
 253                 size = intel_remapped_info_size(&fb->remapped_view.gtt.remapped);
 254         else
 255                 size = DIV_ROUND_UP_ULL(obj->size, I915_GTT_PAGE_SIZE);
 256
 257         size = round_up(size * sizeof(gen8_pte_t), I915_GTT_PAGE_SIZE);
 258
 259         dpt_obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_CONTIGUOUS);
 260         if (IS_ERR(dpt_obj) && i915_ggtt_has_aperture(to_gt(i915)->ggtt))
 261                 dpt_obj = i915_gem_object_create_stolen(i915, size);
 262         if (IS_ERR(dpt_obj) && !HAS_LMEM(i915)) {
 263                 drm_dbg_kms(&i915->drm, "Allocating dpt from smem\n");
 264                 dpt_obj = i915_gem_object_create_shmem(i915, size);
 265         }
 266         if (IS_ERR(dpt_obj))
 267                 return ERR_CAST(dpt_obj);
 268
 269         ret = i915_gem_object_lock_interruptible(dpt_obj, NULL);
 270         if (!ret) {
 271                 ret = i915_gem_object_set_cache_level(dpt_obj, I915_CACHE_NONE);
 272                 i915_gem_object_unlock(dpt_obj);
 273         }
 274         if (ret) {
 275                 i915_gem_object_put(dpt_obj);
 276                 return ERR_PTR(ret);
 277         }
 278
 279         dpt = kzalloc(sizeof(*dpt), GFP_KERNEL);
 280         if (!dpt) {
 281                 i915_gem_object_put(dpt_obj);
 282                 return ERR_PTR(-ENOMEM);
 283         }
 284
 285         vm = &dpt->vm;
 286
 287         vm->gt = to_gt(i915);
 288         vm->i915 = i915;
 289         vm->dma = i915->drm.dev;
 290         vm->total = (size / sizeof(gen8_pte_t)) * I915_GTT_PAGE_SIZE;
 291         vm->is_dpt = true;
 292
 293         i915_address_space_init(vm, VM_CLASS_DPT);
 294
 295         vm->insert_page = dpt_insert_page;
 296         vm->clear_range = dpt_clear_range;
 297         vm->insert_entries = dpt_insert_entries;
 298         vm->cleanup = dpt_cleanup;
 299
 300         vm->vma_ops.bind_vma    = dpt_bind_vma;
 301         vm->vma_ops.unbind_vma  = dpt_unbind_vma;
 302
 303         vm->pte_encode = vm->gt->ggtt->vm.pte_encode;
 304
 305         dpt->obj = dpt_obj;
 306         dpt->obj->is_dpt = true;
 307
 308         return &dpt->vm;
 309 }
 310
 311 void intel_dpt_destroy(struct i915_address_space *vm)
 312 {
 313         struct i915_dpt *dpt = i915_vm_to_dpt(vm);
 314
 315         dpt->obj->is_dpt = false;
 316         i915_vm_put(&dpt->vm);
 317 }
 318