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 GEM_BUG_ON(!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 enum i915_cache_level level, 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, level, flags)); 52 } 53 54 static void dpt_insert_entries(struct i915_address_space *vm, 55 struct i915_vma_resource *vma_res, 56 enum i915_cache_level level, 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, level, 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 enum i915_cache_level cache_level, 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, cache_level, 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 atomic_dec(&i915->gpu_error.pending_fb_pin); 168 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 169 170 return err ? ERR_PTR(err) : vma; 171 } 172 173 void intel_dpt_unpin(struct i915_address_space *vm) 174 { 175 struct i915_dpt *dpt = i915_vm_to_dpt(vm); 176 177 i915_vma_unpin_iomap(dpt->vma); 178 i915_vma_put(dpt->vma); 179 } 180 181 /** 182 * intel_dpt_resume - restore the memory mapping for all DPT FBs during system resume 183 * @i915: device instance 184 * 185 * Restore the memory mapping during system resume for all framebuffers which 186 * are mapped to HW via a GGTT->DPT page table. The content of these page 187 * tables are not stored in the hibernation image during S4 and S3RST->S4 188 * transitions, so here we reprogram the PTE entries in those tables. 189 * 190 * This function must be called after the mappings in GGTT have been restored calling 191 * i915_ggtt_resume(). 192 */ 193 void intel_dpt_resume(struct drm_i915_private *i915) 194 { 195 struct drm_framebuffer *drm_fb; 196 197 if (!HAS_DISPLAY(i915)) 198 return; 199 200 mutex_lock(&i915->drm.mode_config.fb_lock); 201 drm_for_each_fb(drm_fb, &i915->drm) { 202 struct intel_framebuffer *fb = to_intel_framebuffer(drm_fb); 203 204 if (fb->dpt_vm) 205 i915_ggtt_resume_vm(fb->dpt_vm); 206 } 207 mutex_unlock(&i915->drm.mode_config.fb_lock); 208 } 209 210 /** 211 * intel_dpt_suspend - suspend the memory mapping for all DPT FBs during system suspend 212 * @i915: device instance 213 * 214 * Suspend the memory mapping during system suspend for all framebuffers which 215 * are mapped to HW via a GGTT->DPT page table. 216 * 217 * This function must be called before the mappings in GGTT are suspended calling 218 * i915_ggtt_suspend(). 219 */ 220 void intel_dpt_suspend(struct drm_i915_private *i915) 221 { 222 struct drm_framebuffer *drm_fb; 223 224 if (!HAS_DISPLAY(i915)) 225 return; 226 227 mutex_lock(&i915->drm.mode_config.fb_lock); 228 229 drm_for_each_fb(drm_fb, &i915->drm) { 230 struct intel_framebuffer *fb = to_intel_framebuffer(drm_fb); 231 232 if (fb->dpt_vm) 233 i915_ggtt_suspend_vm(fb->dpt_vm); 234 } 235 236 mutex_unlock(&i915->drm.mode_config.fb_lock); 237 } 238 239 struct i915_address_space * 240 intel_dpt_create(struct intel_framebuffer *fb) 241 { 242 struct drm_gem_object *obj = &intel_fb_obj(&fb->base)->base; 243 struct drm_i915_private *i915 = to_i915(obj->dev); 244 struct drm_i915_gem_object *dpt_obj; 245 struct i915_address_space *vm; 246 struct i915_dpt *dpt; 247 size_t size; 248 int ret; 249 250 if (intel_fb_needs_pot_stride_remap(fb)) 251 size = intel_remapped_info_size(&fb->remapped_view.gtt.remapped); 252 else 253 size = DIV_ROUND_UP_ULL(obj->size, I915_GTT_PAGE_SIZE); 254 255 size = round_up(size * sizeof(gen8_pte_t), I915_GTT_PAGE_SIZE); 256 257 dpt_obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_CONTIGUOUS); 258 if (IS_ERR(dpt_obj) && i915_ggtt_has_aperture(to_gt(i915)->ggtt)) 259 dpt_obj = i915_gem_object_create_stolen(i915, size); 260 if (IS_ERR(dpt_obj) && !HAS_LMEM(i915)) { 261 drm_dbg_kms(&i915->drm, "Allocating dpt from smem\n"); 262 dpt_obj = i915_gem_object_create_internal(i915, size); 263 } 264 if (IS_ERR(dpt_obj)) 265 return ERR_CAST(dpt_obj); 266 267 ret = i915_gem_object_lock_interruptible(dpt_obj, NULL); 268 if (!ret) { 269 ret = i915_gem_object_set_cache_level(dpt_obj, I915_CACHE_NONE); 270 i915_gem_object_unlock(dpt_obj); 271 } 272 if (ret) { 273 i915_gem_object_put(dpt_obj); 274 return ERR_PTR(ret); 275 } 276 277 dpt = kzalloc(sizeof(*dpt), GFP_KERNEL); 278 if (!dpt) { 279 i915_gem_object_put(dpt_obj); 280 return ERR_PTR(-ENOMEM); 281 } 282 283 vm = &dpt->vm; 284 285 vm->gt = to_gt(i915); 286 vm->i915 = i915; 287 vm->dma = i915->drm.dev; 288 vm->total = (size / sizeof(gen8_pte_t)) * I915_GTT_PAGE_SIZE; 289 vm->is_dpt = true; 290 291 i915_address_space_init(vm, VM_CLASS_DPT); 292 293 vm->insert_page = dpt_insert_page; 294 vm->clear_range = dpt_clear_range; 295 vm->insert_entries = dpt_insert_entries; 296 vm->cleanup = dpt_cleanup; 297 298 vm->vma_ops.bind_vma = dpt_bind_vma; 299 vm->vma_ops.unbind_vma = dpt_unbind_vma; 300 301 vm->pte_encode = gen8_ggtt_pte_encode; 302 303 dpt->obj = dpt_obj; 304 305 return &dpt->vm; 306 } 307 308 void intel_dpt_destroy(struct i915_address_space *vm) 309 { 310 struct i915_dpt *dpt = i915_vm_to_dpt(vm); 311 312 i915_vm_put(&dpt->vm); 313 } 314