1 /* 2 * Copyright © 2014 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Please try to maintain the following order within this file unless it makes 24 * sense to do otherwise. From top to bottom: 25 * 1. typedefs 26 * 2. #defines, and macros 27 * 3. structure definitions 28 * 4. function prototypes 29 * 30 * Within each section, please try to order by generation in ascending order, 31 * from top to bottom (ie. gen6 on the top, gen8 on the bottom). 32 */ 33 34 #ifndef __I915_GEM_GTT_H__ 35 #define __I915_GEM_GTT_H__ 36 37 #include <linux/seq_file.h> 38 39 typedef uint32_t gen6_gtt_pte_t; 40 typedef uint64_t gen8_gtt_pte_t; 41 typedef gen8_gtt_pte_t gen8_ppgtt_pde_t; 42 43 #define gtt_total_entries(gtt) ((gtt).base.total >> PAGE_SHIFT) 44 45 #define I915_PPGTT_PT_ENTRIES (PAGE_SIZE / sizeof(gen6_gtt_pte_t)) 46 /* gen6-hsw has bit 11-4 for physical addr bit 39-32 */ 47 #define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0)) 48 #define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr) 49 #define GEN6_PDE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr) 50 #define GEN6_PTE_CACHE_LLC (2 << 1) 51 #define GEN6_PTE_UNCACHED (1 << 1) 52 #define GEN6_PTE_VALID (1 << 0) 53 54 #define GEN6_PPGTT_PD_ENTRIES 512 55 #define GEN6_PD_SIZE (GEN6_PPGTT_PD_ENTRIES * PAGE_SIZE) 56 #define GEN6_PD_ALIGN (PAGE_SIZE * 16) 57 #define GEN6_PDE_VALID (1 << 0) 58 59 #define GEN7_PTE_CACHE_L3_LLC (3 << 1) 60 61 #define BYT_PTE_SNOOPED_BY_CPU_CACHES (1 << 2) 62 #define BYT_PTE_WRITEABLE (1 << 1) 63 64 /* Cacheability Control is a 4-bit value. The low three bits are stored in bits 65 * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE. 66 */ 67 #define HSW_CACHEABILITY_CONTROL(bits) ((((bits) & 0x7) << 1) | \ 68 (((bits) & 0x8) << (11 - 3))) 69 #define HSW_WB_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x2) 70 #define HSW_WB_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x3) 71 #define HSW_WB_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x8) 72 #define HSW_WB_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0xb) 73 #define HSW_WT_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x7) 74 #define HSW_WT_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x6) 75 #define HSW_PTE_UNCACHED (0) 76 #define HSW_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0x7f0)) 77 #define HSW_PTE_ADDR_ENCODE(addr) HSW_GTT_ADDR_ENCODE(addr) 78 79 /* GEN8 legacy style address is defined as a 3 level page table: 80 * 31:30 | 29:21 | 20:12 | 11:0 81 * PDPE | PDE | PTE | offset 82 * The difference as compared to normal x86 3 level page table is the PDPEs are 83 * programmed via register. 84 */ 85 #define GEN8_PDPE_SHIFT 30 86 #define GEN8_PDPE_MASK 0x3 87 #define GEN8_PDE_SHIFT 21 88 #define GEN8_PDE_MASK 0x1ff 89 #define GEN8_PTE_SHIFT 12 90 #define GEN8_PTE_MASK 0x1ff 91 #define GEN8_LEGACY_PDPS 4 92 #define GEN8_PTES_PER_PAGE (PAGE_SIZE / sizeof(gen8_gtt_pte_t)) 93 #define GEN8_PDES_PER_PAGE (PAGE_SIZE / sizeof(gen8_ppgtt_pde_t)) 94 95 #define PPAT_UNCACHED_INDEX (_PAGE_PWT | _PAGE_PCD) 96 #define PPAT_CACHED_PDE_INDEX 0 /* WB LLC */ 97 #define PPAT_CACHED_INDEX _PAGE_PAT /* WB LLCeLLC */ 98 #define PPAT_DISPLAY_ELLC_INDEX _PAGE_PCD /* WT eLLC */ 99 100 #define CHV_PPAT_SNOOP (1<<6) 101 #define GEN8_PPAT_AGE(x) (x<<4) 102 #define GEN8_PPAT_LLCeLLC (3<<2) 103 #define GEN8_PPAT_LLCELLC (2<<2) 104 #define GEN8_PPAT_LLC (1<<2) 105 #define GEN8_PPAT_WB (3<<0) 106 #define GEN8_PPAT_WT (2<<0) 107 #define GEN8_PPAT_WC (1<<0) 108 #define GEN8_PPAT_UC (0<<0) 109 #define GEN8_PPAT_ELLC_OVERRIDE (0<<2) 110 #define GEN8_PPAT(i, x) ((uint64_t) (x) << ((i) * 8)) 111 112 enum i915_cache_level; 113 /** 114 * A VMA represents a GEM BO that is bound into an address space. Therefore, a 115 * VMA's presence cannot be guaranteed before binding, or after unbinding the 116 * object into/from the address space. 117 * 118 * To make things as simple as possible (ie. no refcounting), a VMA's lifetime 119 * will always be <= an objects lifetime. So object refcounting should cover us. 120 */ 121 struct i915_vma { 122 struct drm_mm_node node; 123 struct drm_i915_gem_object *obj; 124 struct i915_address_space *vm; 125 126 /** This object's place on the active/inactive lists */ 127 struct list_head mm_list; 128 129 struct list_head vma_link; /* Link in the object's VMA list */ 130 131 /** This vma's place in the batchbuffer or on the eviction list */ 132 struct list_head exec_list; 133 134 /** 135 * Used for performing relocations during execbuffer insertion. 136 */ 137 struct hlist_node exec_node; 138 unsigned long exec_handle; 139 struct drm_i915_gem_exec_object2 *exec_entry; 140 141 /** 142 * How many users have pinned this object in GTT space. The following 143 * users can each hold at most one reference: pwrite/pread, pin_ioctl 144 * (via user_pin_count), execbuffer (objects are not allowed multiple 145 * times for the same batchbuffer), and the framebuffer code. When 146 * switching/pageflipping, the framebuffer code has at most two buffers 147 * pinned per crtc. 148 * 149 * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3 150 * bits with absolutely no headroom. So use 4 bits. */ 151 unsigned int pin_count:4; 152 #define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf 153 154 /** Unmap an object from an address space. This usually consists of 155 * setting the valid PTE entries to a reserved scratch page. */ 156 void (*unbind_vma)(struct i915_vma *vma); 157 /* Map an object into an address space with the given cache flags. */ 158 #define GLOBAL_BIND (1<<0) 159 #define PTE_READ_ONLY (1<<1) 160 void (*bind_vma)(struct i915_vma *vma, 161 enum i915_cache_level cache_level, 162 u32 flags); 163 }; 164 165 struct i915_address_space { 166 struct drm_mm mm; 167 struct drm_device *dev; 168 struct list_head global_link; 169 unsigned long start; /* Start offset always 0 for dri2 */ 170 size_t total; /* size addr space maps (ex. 2GB for ggtt) */ 171 172 struct { 173 dma_addr_t addr; 174 struct vm_page *page; 175 } scratch; 176 177 /** 178 * List of objects currently involved in rendering. 179 * 180 * Includes buffers having the contents of their GPU caches 181 * flushed, not necessarily primitives. last_rendering_seqno 182 * represents when the rendering involved will be completed. 183 * 184 * A reference is held on the buffer while on this list. 185 */ 186 struct list_head active_list; 187 188 /** 189 * LRU list of objects which are not in the ringbuffer and 190 * are ready to unbind, but are still in the GTT. 191 * 192 * last_rendering_seqno is 0 while an object is in this list. 193 * 194 * A reference is not held on the buffer while on this list, 195 * as merely being GTT-bound shouldn't prevent its being 196 * freed, and we'll pull it off the list in the free path. 197 */ 198 struct list_head inactive_list; 199 200 /* FIXME: Need a more generic return type */ 201 gen6_gtt_pte_t (*pte_encode)(dma_addr_t addr, 202 enum i915_cache_level level, 203 bool valid, u32 flags); /* Create a valid PTE */ 204 void (*clear_range)(struct i915_address_space *vm, 205 uint64_t start, 206 uint64_t length, 207 bool use_scratch); 208 void (*insert_entries)(struct i915_address_space *vm, 209 vm_page_t *pages, 210 uint64_t start, 211 unsigned int num_entries, 212 enum i915_cache_level cache_level, u32 flags); 213 void (*cleanup)(struct i915_address_space *vm); 214 }; 215 216 /* The Graphics Translation Table is the way in which GEN hardware translates a 217 * Graphics Virtual Address into a Physical Address. In addition to the normal 218 * collateral associated with any va->pa translations GEN hardware also has a 219 * portion of the GTT which can be mapped by the CPU and remain both coherent 220 * and correct (in cases like swizzling). That region is referred to as GMADR in 221 * the spec. 222 */ 223 struct i915_gtt { 224 struct i915_address_space base; 225 size_t stolen_size; /* Total size of stolen memory */ 226 227 unsigned long mappable_end; /* End offset that we can CPU map */ 228 struct io_mapping *mappable; /* Mapping to our CPU mappable region */ 229 phys_addr_t mappable_base; /* PA of our GMADR */ 230 231 /** "Graphics Stolen Memory" holds the global PTEs */ 232 void __iomem *gsm; 233 234 bool do_idle_maps; 235 236 int mtrr; 237 238 /* global gtt ops */ 239 int (*gtt_probe)(struct drm_device *dev, size_t *gtt_total, 240 size_t *stolen, phys_addr_t *mappable_base, 241 unsigned long *mappable_end); 242 }; 243 244 struct i915_hw_ppgtt { 245 struct i915_address_space base; 246 struct kref ref; 247 struct drm_mm_node node; 248 unsigned num_pd_entries; 249 unsigned num_pd_pages; /* gen8+ */ 250 union { 251 struct vm_page **pt_pages; 252 struct vm_page **gen8_pt_pages[GEN8_LEGACY_PDPS]; 253 }; 254 struct vm_page *pd_pages; 255 union { 256 uint32_t pd_offset; 257 dma_addr_t pd_dma_addr[GEN8_LEGACY_PDPS]; 258 }; 259 union { 260 dma_addr_t *pt_dma_addr; 261 dma_addr_t *gen8_pt_dma_addr[4]; 262 }; 263 264 struct intel_context *ctx; 265 266 int (*enable)(struct i915_hw_ppgtt *ppgtt); 267 int (*switch_mm)(struct i915_hw_ppgtt *ppgtt, 268 struct intel_engine_cs *ring, 269 bool synchronous); 270 void (*debug_dump)(struct i915_hw_ppgtt *ppgtt, struct seq_file *m); 271 }; 272 273 int i915_gem_gtt_init(struct drm_device *dev); 274 void i915_gem_init_global_gtt(struct drm_device *dev); 275 void i915_gem_setup_global_gtt(struct drm_device *dev, unsigned long start, 276 unsigned long mappable_end, unsigned long end); 277 278 bool intel_enable_ppgtt(struct drm_device *dev, bool full); 279 int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt); 280 281 void i915_check_and_clear_faults(struct drm_device *dev); 282 void i915_gem_suspend_gtt_mappings(struct drm_device *dev); 283 void i915_gem_restore_gtt_mappings(struct drm_device *dev); 284 285 int __must_check i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj); 286 void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj); 287 288 #endif 289