1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2021-2023 Intel Corporation 4 * Copyright (C) 2021-2002 Red Hat 5 */ 6 7 #include <drm/drm_managed.h> 8 9 #include <drm/ttm/ttm_device.h> 10 #include <drm/ttm/ttm_placement.h> 11 #include <drm/ttm/ttm_range_manager.h> 12 13 #include <generated/xe_wa_oob.h> 14 15 #include "regs/xe_bars.h" 16 #include "regs/xe_gt_regs.h" 17 #include "regs/xe_regs.h" 18 #include "xe_bo.h" 19 #include "xe_device.h" 20 #include "xe_gt.h" 21 #include "xe_gt_printk.h" 22 #include "xe_mmio.h" 23 #include "xe_res_cursor.h" 24 #include "xe_sriov.h" 25 #include "xe_ttm_stolen_mgr.h" 26 #include "xe_ttm_vram_mgr.h" 27 #include "xe_wa.h" 28 29 struct xe_ttm_stolen_mgr { 30 struct xe_ttm_vram_mgr base; 31 32 /* PCI base offset */ 33 resource_size_t io_base; 34 /* GPU base offset */ 35 resource_size_t stolen_base; 36 37 void __iomem *mapping; 38 }; 39 40 static inline struct xe_ttm_stolen_mgr * to_stolen_mgr(struct ttm_resource_manager * man)41 to_stolen_mgr(struct ttm_resource_manager *man) 42 { 43 return container_of(man, struct xe_ttm_stolen_mgr, base.manager); 44 } 45 46 /** 47 * xe_ttm_stolen_cpu_access_needs_ggtt() - If we can't directly CPU access 48 * stolen, can we then fallback to mapping through the GGTT. 49 * @xe: xe device 50 * 51 * Some older integrated platforms don't support reliable CPU access for stolen, 52 * however on such hardware we can always use the mappable part of the GGTT for 53 * CPU access. Check if that's the case for this device. 54 */ xe_ttm_stolen_cpu_access_needs_ggtt(struct xe_device * xe)55 bool xe_ttm_stolen_cpu_access_needs_ggtt(struct xe_device *xe) 56 { 57 return GRAPHICS_VERx100(xe) < 1270 && !IS_DGFX(xe); 58 } 59 detect_bar2_dgfx(struct xe_device * xe,struct xe_ttm_stolen_mgr * mgr)60 static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr) 61 { 62 struct xe_tile *tile = xe_device_get_root_tile(xe); 63 struct xe_gt *mmio = xe_root_mmio_gt(xe); 64 struct pci_dev *pdev = to_pci_dev(xe->drm.dev); 65 u64 stolen_size; 66 u64 tile_offset; 67 u64 tile_size; 68 69 tile_offset = tile->mem.vram.io_start - xe->mem.vram.io_start; 70 tile_size = tile->mem.vram.actual_physical_size; 71 72 /* Use DSM base address instead for stolen memory */ 73 mgr->stolen_base = (xe_mmio_read64_2x32(mmio, DSMBASE) & BDSM_MASK) - tile_offset; 74 if (drm_WARN_ON(&xe->drm, tile_size < mgr->stolen_base)) 75 return 0; 76 77 stolen_size = tile_size - mgr->stolen_base; 78 79 /* Verify usage fits in the actual resource available */ 80 if (mgr->stolen_base + stolen_size <= pci_resource_len(pdev, LMEM_BAR)) 81 mgr->io_base = tile->mem.vram.io_start + mgr->stolen_base; 82 83 /* 84 * There may be few KB of platform dependent reserved memory at the end 85 * of vram which is not part of the DSM. Such reserved memory portion is 86 * always less then DSM granularity so align down the stolen_size to DSM 87 * granularity to accommodate such reserve vram portion. 88 */ 89 return ALIGN_DOWN(stolen_size, SZ_1M); 90 } 91 get_wopcm_size(struct xe_device * xe)92 static u32 get_wopcm_size(struct xe_device *xe) 93 { 94 u32 wopcm_size; 95 u64 val; 96 97 val = xe_mmio_read64_2x32(xe_root_mmio_gt(xe), STOLEN_RESERVED); 98 val = REG_FIELD_GET64(WOPCM_SIZE_MASK, val); 99 100 switch (val) { 101 case 0x5 ... 0x6: 102 val--; 103 fallthrough; 104 case 0x0 ... 0x3: 105 wopcm_size = (1U << val) * SZ_1M; 106 break; 107 default: 108 WARN(1, "Missing case wopcm_size=%llx\n", val); 109 wopcm_size = 0; 110 } 111 112 return wopcm_size; 113 } 114 detect_bar2_integrated(struct xe_device * xe,struct xe_ttm_stolen_mgr * mgr)115 static u32 detect_bar2_integrated(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr) 116 { 117 struct pci_dev *pdev = to_pci_dev(xe->drm.dev); 118 struct xe_gt *media_gt = xe_device_get_root_tile(xe)->media_gt; 119 u32 stolen_size, wopcm_size; 120 u32 ggc, gms; 121 122 ggc = xe_mmio_read32(xe_root_mmio_gt(xe), GGC); 123 124 /* 125 * Check GGMS: it should be fixed 0x3 (8MB), which corresponds to the 126 * GTT size 127 */ 128 if (drm_WARN_ON(&xe->drm, (ggc & GGMS_MASK) != GGMS_MASK)) 129 return 0; 130 131 /* 132 * Graphics >= 1270 uses the offset to the GSMBASE as address in the 133 * PTEs, together with the DM flag being set. Previously there was no 134 * such flag so the address was the io_base. 135 * 136 * DSMBASE = GSMBASE + 8MB 137 */ 138 mgr->stolen_base = SZ_8M; 139 mgr->io_base = pci_resource_start(pdev, 2) + mgr->stolen_base; 140 141 /* return valid GMS value, -EIO if invalid */ 142 gms = REG_FIELD_GET(GMS_MASK, ggc); 143 switch (gms) { 144 case 0x0 ... 0x04: 145 stolen_size = gms * 32 * SZ_1M; 146 break; 147 case 0xf0 ... 0xfe: 148 stolen_size = (gms - 0xf0 + 1) * 4 * SZ_1M; 149 break; 150 default: 151 return 0; 152 } 153 154 /* Carve out the top of DSM as it contains the reserved WOPCM region */ 155 wopcm_size = get_wopcm_size(xe); 156 if (drm_WARN_ON(&xe->drm, !wopcm_size)) 157 return 0; 158 159 stolen_size -= wopcm_size; 160 161 if (media_gt && XE_WA(media_gt, 14019821291)) { 162 u64 gscpsmi_base = xe_mmio_read64_2x32(media_gt, GSCPSMI_BASE) 163 & ~GENMASK_ULL(5, 0); 164 165 /* 166 * This workaround is primarily implemented by the BIOS. We 167 * just need to figure out whether the BIOS has applied the 168 * workaround (meaning the programmed address falls within 169 * the DSM) and, if so, reserve that part of the DSM to 170 * prevent accidental reuse. The DSM location should be just 171 * below the WOPCM. 172 */ 173 if (gscpsmi_base >= mgr->io_base && 174 gscpsmi_base < mgr->io_base + stolen_size) { 175 xe_gt_dbg(media_gt, 176 "Reserving %llu bytes of DSM for Wa_14019821291\n", 177 mgr->io_base + stolen_size - gscpsmi_base); 178 stolen_size = gscpsmi_base - mgr->io_base; 179 } 180 } 181 182 if (drm_WARN_ON(&xe->drm, stolen_size + SZ_8M > pci_resource_len(pdev, 2))) 183 return 0; 184 185 return stolen_size; 186 } 187 188 extern struct resource intel_graphics_stolen_res; 189 detect_stolen(struct xe_device * xe,struct xe_ttm_stolen_mgr * mgr)190 static u64 detect_stolen(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr) 191 { 192 #ifdef CONFIG_X86 193 /* Map into GGTT */ 194 mgr->io_base = pci_resource_start(to_pci_dev(xe->drm.dev), 2); 195 196 /* Stolen memory is x86 only */ 197 mgr->stolen_base = intel_graphics_stolen_res.start; 198 return resource_size(&intel_graphics_stolen_res); 199 #else 200 return 0; 201 #endif 202 } 203 xe_ttm_stolen_mgr_init(struct xe_device * xe)204 void xe_ttm_stolen_mgr_init(struct xe_device *xe) 205 { 206 struct xe_ttm_stolen_mgr *mgr = drmm_kzalloc(&xe->drm, sizeof(*mgr), GFP_KERNEL); 207 struct pci_dev *pdev = to_pci_dev(xe->drm.dev); 208 u64 stolen_size, io_size; 209 int err; 210 211 if (!mgr) { 212 drm_dbg_kms(&xe->drm, "Stolen mgr init failed\n"); 213 return; 214 } 215 216 if (IS_SRIOV_VF(xe)) 217 stolen_size = 0; 218 else if (IS_DGFX(xe)) 219 stolen_size = detect_bar2_dgfx(xe, mgr); 220 else if (GRAPHICS_VERx100(xe) >= 1270) 221 stolen_size = detect_bar2_integrated(xe, mgr); 222 else 223 stolen_size = detect_stolen(xe, mgr); 224 225 if (!stolen_size) { 226 drm_dbg_kms(&xe->drm, "No stolen memory support\n"); 227 return; 228 } 229 230 /* 231 * We don't try to attempt partial visible support for stolen vram, 232 * since stolen is always at the end of vram, and the BAR size is pretty 233 * much always 256M, with small-bar. 234 */ 235 io_size = 0; 236 if (mgr->io_base && !xe_ttm_stolen_cpu_access_needs_ggtt(xe)) 237 io_size = stolen_size; 238 239 err = __xe_ttm_vram_mgr_init(xe, &mgr->base, XE_PL_STOLEN, stolen_size, 240 io_size, PAGE_SIZE); 241 if (err) { 242 drm_dbg_kms(&xe->drm, "Stolen mgr init failed: %i\n", err); 243 return; 244 } 245 246 drm_dbg_kms(&xe->drm, "Initialized stolen memory support with %llu bytes\n", 247 stolen_size); 248 249 if (io_size) 250 mgr->mapping = devm_ioremap_wc(&pdev->dev, mgr->io_base, io_size); 251 } 252 xe_ttm_stolen_io_offset(struct xe_bo * bo,u32 offset)253 u64 xe_ttm_stolen_io_offset(struct xe_bo *bo, u32 offset) 254 { 255 struct xe_device *xe = xe_bo_device(bo); 256 struct ttm_resource_manager *ttm_mgr = ttm_manager_type(&xe->ttm, XE_PL_STOLEN); 257 struct xe_ttm_stolen_mgr *mgr = to_stolen_mgr(ttm_mgr); 258 struct xe_res_cursor cur; 259 260 XE_WARN_ON(!mgr->io_base); 261 262 if (xe_ttm_stolen_cpu_access_needs_ggtt(xe)) 263 return mgr->io_base + xe_bo_ggtt_addr(bo) + offset; 264 265 xe_res_first(bo->ttm.resource, offset, 4096, &cur); 266 return mgr->io_base + cur.start; 267 } 268 __xe_ttm_stolen_io_mem_reserve_bar2(struct xe_device * xe,struct xe_ttm_stolen_mgr * mgr,struct ttm_resource * mem)269 static int __xe_ttm_stolen_io_mem_reserve_bar2(struct xe_device *xe, 270 struct xe_ttm_stolen_mgr *mgr, 271 struct ttm_resource *mem) 272 { 273 struct xe_res_cursor cur; 274 275 if (!mgr->io_base) 276 return -EIO; 277 278 xe_res_first(mem, 0, 4096, &cur); 279 mem->bus.offset = cur.start; 280 281 drm_WARN_ON(&xe->drm, !(mem->placement & TTM_PL_FLAG_CONTIGUOUS)); 282 283 if (mem->placement & TTM_PL_FLAG_CONTIGUOUS && mgr->mapping) 284 mem->bus.addr = (u8 __force *)mgr->mapping + mem->bus.offset; 285 286 mem->bus.offset += mgr->io_base; 287 mem->bus.is_iomem = true; 288 mem->bus.caching = ttm_write_combined; 289 290 return 0; 291 } 292 __xe_ttm_stolen_io_mem_reserve_stolen(struct xe_device * xe,struct xe_ttm_stolen_mgr * mgr,struct ttm_resource * mem)293 static int __xe_ttm_stolen_io_mem_reserve_stolen(struct xe_device *xe, 294 struct xe_ttm_stolen_mgr *mgr, 295 struct ttm_resource *mem) 296 { 297 #ifdef CONFIG_X86 298 struct xe_bo *bo = ttm_to_xe_bo(mem->bo); 299 300 XE_WARN_ON(IS_DGFX(xe)); 301 302 /* XXX: Require BO to be mapped to GGTT? */ 303 if (drm_WARN_ON(&xe->drm, !(bo->flags & XE_BO_FLAG_GGTT))) 304 return -EIO; 305 306 /* GGTT is always contiguously mapped */ 307 mem->bus.offset = xe_bo_ggtt_addr(bo) + mgr->io_base; 308 309 mem->bus.is_iomem = true; 310 mem->bus.caching = ttm_write_combined; 311 312 return 0; 313 #else 314 /* How is it even possible to get here without gen12 stolen? */ 315 drm_WARN_ON(&xe->drm, 1); 316 return -EIO; 317 #endif 318 } 319 xe_ttm_stolen_io_mem_reserve(struct xe_device * xe,struct ttm_resource * mem)320 int xe_ttm_stolen_io_mem_reserve(struct xe_device *xe, struct ttm_resource *mem) 321 { 322 struct ttm_resource_manager *ttm_mgr = ttm_manager_type(&xe->ttm, XE_PL_STOLEN); 323 struct xe_ttm_stolen_mgr *mgr = ttm_mgr ? to_stolen_mgr(ttm_mgr) : NULL; 324 325 if (!mgr || !mgr->io_base) 326 return -EIO; 327 328 if (xe_ttm_stolen_cpu_access_needs_ggtt(xe)) 329 return __xe_ttm_stolen_io_mem_reserve_stolen(xe, mgr, mem); 330 else 331 return __xe_ttm_stolen_io_mem_reserve_bar2(xe, mgr, mem); 332 } 333 xe_ttm_stolen_gpu_offset(struct xe_device * xe)334 u64 xe_ttm_stolen_gpu_offset(struct xe_device *xe) 335 { 336 struct xe_ttm_stolen_mgr *mgr = 337 to_stolen_mgr(ttm_manager_type(&xe->ttm, XE_PL_STOLEN)); 338 339 return mgr->stolen_base; 340 } 341