root/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

DEFINITIONS

1. amdgpu_gmc_get_pde_for_bo
2. amdgpu_gmc_pd_addr
3. amdgpu_gmc_set_pte_pde
4. amdgpu_gmc_agp_addr
5. amdgpu_gmc_vram_location
6. amdgpu_gmc_gart_location
7. amdgpu_gmc_agp_location
8. amdgpu_gmc_filter_faults

   1 /*
   2  * Copyright 2018 Advanced Micro Devices, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 
  27 #include <linux/io-64-nonatomic-lo-hi.h>
  28 
  29 #include "amdgpu.h"
  30 
  31 /**
  32  * amdgpu_gmc_get_pde_for_bo - get the PDE for a BO
  33  *
  34  * @bo: the BO to get the PDE for
  35  * @level: the level in the PD hirarchy
  36  * @addr: resulting addr
  37  * @flags: resulting flags
  38  *
  39  * Get the address and flags to be used for a PDE (Page Directory Entry).
  40  */
  41 void amdgpu_gmc_get_pde_for_bo(struct amdgpu_bo *bo, int level,
  42                                uint64_t *addr, uint64_t *flags)
  43 {
  44         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
  45         struct ttm_dma_tt *ttm;
  46 
  47         switch (bo->tbo.mem.mem_type) {
  48         case TTM_PL_TT:
  49                 ttm = container_of(bo->tbo.ttm, struct ttm_dma_tt, ttm);
  50                 *addr = ttm->dma_address[0];
  51                 break;
  52         case TTM_PL_VRAM:
  53                 *addr = amdgpu_bo_gpu_offset(bo);
  54                 break;
  55         default:
  56                 *addr = 0;
  57                 break;
  58         }
  59         *flags = amdgpu_ttm_tt_pde_flags(bo->tbo.ttm, &bo->tbo.mem);
  60         amdgpu_gmc_get_vm_pde(adev, level, addr, flags);
  61 }
  62 
  63 /**
  64  * amdgpu_gmc_pd_addr - return the address of the root directory
  65  *
  66  */
  67 uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo)
  68 {
  69         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
  70         uint64_t pd_addr;
  71 
  72         /* TODO: move that into ASIC specific code */
  73         if (adev->asic_type >= CHIP_VEGA10) {
  74                 uint64_t flags = AMDGPU_PTE_VALID;
  75 
  76                 amdgpu_gmc_get_pde_for_bo(bo, -1, &pd_addr, &flags);
  77                 pd_addr |= flags;
  78         } else {
  79                 pd_addr = amdgpu_bo_gpu_offset(bo);
  80         }
  81         return pd_addr;
  82 }
  83 
  84 /**
  85  * amdgpu_gmc_set_pte_pde - update the page tables using CPU
  86  *
  87  * @adev: amdgpu_device pointer
  88  * @cpu_pt_addr: cpu address of the page table
  89  * @gpu_page_idx: entry in the page table to update
  90  * @addr: dst addr to write into pte/pde
  91  * @flags: access flags
  92  *
  93  * Update the page tables using CPU.
  94  */
  95 int amdgpu_gmc_set_pte_pde(struct amdgpu_device *adev, void *cpu_pt_addr,
  96                                 uint32_t gpu_page_idx, uint64_t addr,
  97                                 uint64_t flags)
  98 {
  99         void __iomem *ptr = (void *)cpu_pt_addr;
 100         uint64_t value;
 101 
 102         /*
 103          * The following is for PTE only. GART does not have PDEs.
 104         */
 105         value = addr & 0x0000FFFFFFFFF000ULL;
 106         value |= flags;
 107         writeq(value, ptr + (gpu_page_idx * 8));
 108         return 0;
 109 }
 110 
 111 /**
 112  * amdgpu_gmc_agp_addr - return the address in the AGP address space
 113  *
 114  * @tbo: TTM BO which needs the address, must be in GTT domain
 115  *
 116  * Tries to figure out how to access the BO through the AGP aperture. Returns
 117  * AMDGPU_BO_INVALID_OFFSET if that is not possible.
 118  */
 119 uint64_t amdgpu_gmc_agp_addr(struct ttm_buffer_object *bo)
 120 {
 121         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
 122         struct ttm_dma_tt *ttm;
 123 
 124         if (bo->num_pages != 1 || bo->ttm->caching_state == tt_cached)
 125                 return AMDGPU_BO_INVALID_OFFSET;
 126 
 127         ttm = container_of(bo->ttm, struct ttm_dma_tt, ttm);
 128         if (ttm->dma_address[0] + PAGE_SIZE >= adev->gmc.agp_size)
 129                 return AMDGPU_BO_INVALID_OFFSET;
 130 
 131         return adev->gmc.agp_start + ttm->dma_address[0];
 132 }
 133 
 134 /**
 135  * amdgpu_gmc_vram_location - try to find VRAM location
 136  *
 137  * @adev: amdgpu device structure holding all necessary informations
 138  * @mc: memory controller structure holding memory informations
 139  * @base: base address at which to put VRAM
 140  *
 141  * Function will try to place VRAM at base address provided
 142  * as parameter.
 143  */
 144 void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
 145                               u64 base)
 146 {
 147         uint64_t limit = (uint64_t)amdgpu_vram_limit << 20;
 148 
 149         mc->vram_start = base;
 150         mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
 151         if (limit && limit < mc->real_vram_size)
 152                 mc->real_vram_size = limit;
 153 
 154         if (mc->xgmi.num_physical_nodes == 0) {
 155                 mc->fb_start = mc->vram_start;
 156                 mc->fb_end = mc->vram_end;
 157         }
 158         dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
 159                         mc->mc_vram_size >> 20, mc->vram_start,
 160                         mc->vram_end, mc->real_vram_size >> 20);
 161 }
 162 
 163 /**
 164  * amdgpu_gmc_gart_location - try to find GART location
 165  *
 166  * @adev: amdgpu device structure holding all necessary informations
 167  * @mc: memory controller structure holding memory informations
 168  *
 169  * Function will place try to place GART before or after VRAM.
 170  *
 171  * If GART size is bigger than space left then we ajust GART size.
 172  * Thus function will never fails.
 173  */
 174 void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
 175 {
 176         const uint64_t four_gb = 0x100000000ULL;
 177         u64 size_af, size_bf;
 178         /*To avoid the hole, limit the max mc address to AMDGPU_GMC_HOLE_START*/
 179         u64 max_mc_address = min(adev->gmc.mc_mask, AMDGPU_GMC_HOLE_START - 1);
 180 
 181         mc->gart_size += adev->pm.smu_prv_buffer_size;
 182 
 183         /* VCE doesn't like it when BOs cross a 4GB segment, so align
 184          * the GART base on a 4GB boundary as well.
 185          */
 186         size_bf = mc->fb_start;
 187         size_af = max_mc_address + 1 - ALIGN(mc->fb_end + 1, four_gb);
 188 
 189         if (mc->gart_size > max(size_bf, size_af)) {
 190                 dev_warn(adev->dev, "limiting GART\n");
 191                 mc->gart_size = max(size_bf, size_af);
 192         }
 193 
 194         if ((size_bf >= mc->gart_size && size_bf < size_af) ||
 195             (size_af < mc->gart_size))
 196                 mc->gart_start = 0;
 197         else
 198                 mc->gart_start = max_mc_address - mc->gart_size + 1;
 199 
 200         mc->gart_start &= ~(four_gb - 1);
 201         mc->gart_end = mc->gart_start + mc->gart_size - 1;
 202         dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",
 203                         mc->gart_size >> 20, mc->gart_start, mc->gart_end);
 204 }
 205 
 206 /**
 207  * amdgpu_gmc_agp_location - try to find AGP location
 208  * @adev: amdgpu device structure holding all necessary informations
 209  * @mc: memory controller structure holding memory informations
 210  *
 211  * Function will place try to find a place for the AGP BAR in the MC address
 212  * space.
 213  *
 214  * AGP BAR will be assigned the largest available hole in the address space.
 215  * Should be called after VRAM and GART locations are setup.
 216  */
 217 void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
 218 {
 219         const uint64_t sixteen_gb = 1ULL << 34;
 220         const uint64_t sixteen_gb_mask = ~(sixteen_gb - 1);
 221         u64 size_af, size_bf;
 222 
 223         if (amdgpu_sriov_vf(adev)) {
 224                 mc->agp_start = 0xffffffff;
 225                 mc->agp_end = 0x0;
 226                 mc->agp_size = 0;
 227 
 228                 return;
 229         }
 230 
 231         if (mc->fb_start > mc->gart_start) {
 232                 size_bf = (mc->fb_start & sixteen_gb_mask) -
 233                         ALIGN(mc->gart_end + 1, sixteen_gb);
 234                 size_af = mc->mc_mask + 1 - ALIGN(mc->fb_end + 1, sixteen_gb);
 235         } else {
 236                 size_bf = mc->fb_start & sixteen_gb_mask;
 237                 size_af = (mc->gart_start & sixteen_gb_mask) -
 238                         ALIGN(mc->fb_end + 1, sixteen_gb);
 239         }
 240 
 241         if (size_bf > size_af) {
 242                 mc->agp_start = (mc->fb_start - size_bf) & sixteen_gb_mask;
 243                 mc->agp_size = size_bf;
 244         } else {
 245                 mc->agp_start = ALIGN(mc->fb_end + 1, sixteen_gb);
 246                 mc->agp_size = size_af;
 247         }
 248 
 249         mc->agp_end = mc->agp_start + mc->agp_size - 1;
 250         dev_info(adev->dev, "AGP: %lluM 0x%016llX - 0x%016llX\n",
 251                         mc->agp_size >> 20, mc->agp_start, mc->agp_end);
 252 }
 253 
 254 /**
 255  * amdgpu_gmc_filter_faults - filter VM faults
 256  *
 257  * @adev: amdgpu device structure
 258  * @addr: address of the VM fault
 259  * @pasid: PASID of the process causing the fault
 260  * @timestamp: timestamp of the fault
 261  *
 262  * Returns:
 263  * True if the fault was filtered and should not be processed further.
 264  * False if the fault is a new one and needs to be handled.
 265  */
 266 bool amdgpu_gmc_filter_faults(struct amdgpu_device *adev, uint64_t addr,
 267                               uint16_t pasid, uint64_t timestamp)
 268 {
 269         struct amdgpu_gmc *gmc = &adev->gmc;
 270 
 271         uint64_t stamp, key = addr << 4 | pasid;
 272         struct amdgpu_gmc_fault *fault;
 273         uint32_t hash;
 274 
 275         /* If we don't have space left in the ring buffer return immediately */
 276         stamp = max(timestamp, AMDGPU_GMC_FAULT_TIMEOUT + 1) -
 277                 AMDGPU_GMC_FAULT_TIMEOUT;
 278         if (gmc->fault_ring[gmc->last_fault].timestamp >= stamp)
 279                 return true;
 280 
 281         /* Try to find the fault in the hash */
 282         hash = hash_64(key, AMDGPU_GMC_FAULT_HASH_ORDER);
 283         fault = &gmc->fault_ring[gmc->fault_hash[hash].idx];
 284         while (fault->timestamp >= stamp) {
 285                 uint64_t tmp;
 286 
 287                 if (fault->key == key)
 288                         return true;
 289 
 290                 tmp = fault->timestamp;
 291                 fault = &gmc->fault_ring[fault->next];
 292 
 293                 /* Check if the entry was reused */
 294                 if (fault->timestamp >= tmp)
 295                         break;
 296         }
 297 
 298         /* Add the fault to the ring */
 299         fault = &gmc->fault_ring[gmc->last_fault];
 300         fault->key = key;
 301         fault->timestamp = timestamp;
 302 
 303         /* And update the hash */
 304         fault->next = gmc->fault_hash[hash].idx;
 305         gmc->fault_hash[hash].idx = gmc->last_fault++;
 306         return false;
 307 }