drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c

   1 /*
   2  * Copyright 2016 Advanced Micro Devices, Inc.
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25
  26 #include <drm/drm_drv.h>
  27
  28 #include "amdgpu.h"
  29
  30 bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev)
  31 {
  32         /* By now all MMIO pages except mailbox are blocked */
  33         /* if blocking is enabled in hypervisor. Choose the */
  34         /* SCRATCH_REG0 to test. */
  35         return RREG32_NO_KIQ(0xc040) == 0xffffffff;
  36 }
  37
  38 void amdgpu_virt_init_setting(struct amdgpu_device *adev)
  39 {
  40         /* enable virtual display */
  41         adev->mode_info.num_crtc = 1;
  42         adev->enable_virtual_display = true;
  43         adev->ddev->driver->driver_features &= ~DRIVER_ATOMIC;
  44         adev->cg_flags = 0;
  45         adev->pg_flags = 0;
  46 }
  47
  48 uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
  49 {
  50         signed long r, cnt = 0;
  51         unsigned long flags;
  52         uint32_t seq;
  53         struct amdgpu_kiq *kiq = &adev->gfx.kiq;
  54         struct amdgpu_ring *ring = &kiq->ring;
  55
  56         BUG_ON(!ring->funcs->emit_rreg);
  57
  58         spin_lock_irqsave(&kiq->ring_lock, flags);
  59         amdgpu_ring_alloc(ring, 32);
  60         amdgpu_ring_emit_rreg(ring, reg);
  61         amdgpu_fence_emit_polling(ring, &seq);
  62         amdgpu_ring_commit(ring);
  63         spin_unlock_irqrestore(&kiq->ring_lock, flags);
  64
  65         r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
  66
  67         /* don't wait anymore for gpu reset case because this way may
  68          * block gpu_recover() routine forever, e.g. this virt_kiq_rreg
  69          * is triggered in TTM and ttm_bo_lock_delayed_workqueue() will
  70          * never return if we keep waiting in virt_kiq_rreg, which cause
  71          * gpu_recover() hang there.
  72          *
  73          * also don't wait anymore for IRQ context
  74          * */
  75         if (r < 1 && (adev->in_gpu_reset || in_interrupt()))
  76                 goto failed_kiq_read;
  77
  78         might_sleep();
  79         while (r < 1 && cnt++ < MAX_KIQ_REG_TRY) {
  80                 msleep(MAX_KIQ_REG_BAILOUT_INTERVAL);
  81                 r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
  82         }
  83
  84         if (cnt > MAX_KIQ_REG_TRY)
  85                 goto failed_kiq_read;
  86
  87         return adev->wb.wb[adev->virt.reg_val_offs];
  88
  89 failed_kiq_read:
  90         pr_err("failed to read reg:%x\n", reg);
  91         return ~0;
  92 }
  93
  94 void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
  95 {
  96         signed long r, cnt = 0;
  97         unsigned long flags;
  98         uint32_t seq;
  99         struct amdgpu_kiq *kiq = &adev->gfx.kiq;
 100         struct amdgpu_ring *ring = &kiq->ring;
 101
 102         BUG_ON(!ring->funcs->emit_wreg);
 103
 104         spin_lock_irqsave(&kiq->ring_lock, flags);
 105         amdgpu_ring_alloc(ring, 32);
 106         amdgpu_ring_emit_wreg(ring, reg, v);
 107         amdgpu_fence_emit_polling(ring, &seq);
 108         amdgpu_ring_commit(ring);
 109         spin_unlock_irqrestore(&kiq->ring_lock, flags);
 110
 111         r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 112
 113         /* don't wait anymore for gpu reset case because this way may
 114          * block gpu_recover() routine forever, e.g. this virt_kiq_rreg
 115          * is triggered in TTM and ttm_bo_lock_delayed_workqueue() will
 116          * never return if we keep waiting in virt_kiq_rreg, which cause
 117          * gpu_recover() hang there.
 118          *
 119          * also don't wait anymore for IRQ context
 120          * */
 121         if (r < 1 && (adev->in_gpu_reset || in_interrupt()))
 122                 goto failed_kiq_write;
 123
 124         might_sleep();
 125         while (r < 1 && cnt++ < MAX_KIQ_REG_TRY) {
 126
 127                 msleep(MAX_KIQ_REG_BAILOUT_INTERVAL);
 128                 r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 129         }
 130
 131         if (cnt > MAX_KIQ_REG_TRY)
 132                 goto failed_kiq_write;
 133
 134         return;
 135
 136 failed_kiq_write:
 137         pr_err("failed to write reg:%x\n", reg);
 138 }
 139
 140 void amdgpu_virt_kiq_reg_write_reg_wait(struct amdgpu_device *adev,
 141                                         uint32_t reg0, uint32_t reg1,
 142                                         uint32_t ref, uint32_t mask)
 143 {
 144         struct amdgpu_kiq *kiq = &adev->gfx.kiq;
 145         struct amdgpu_ring *ring = &kiq->ring;
 146         signed long r, cnt = 0;
 147         unsigned long flags;
 148         uint32_t seq;
 149
 150         spin_lock_irqsave(&kiq->ring_lock, flags);
 151         amdgpu_ring_alloc(ring, 32);
 152         amdgpu_ring_emit_reg_write_reg_wait(ring, reg0, reg1,
 153                                             ref, mask);
 154         amdgpu_fence_emit_polling(ring, &seq);
 155         amdgpu_ring_commit(ring);
 156         spin_unlock_irqrestore(&kiq->ring_lock, flags);
 157
 158         r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 159
 160         /* don't wait anymore for IRQ context */
 161         if (r < 1 && in_interrupt())
 162                 goto failed_kiq;
 163
 164         might_sleep();
 165         while (r < 1 && cnt++ < MAX_KIQ_REG_TRY) {
 166
 167                 msleep(MAX_KIQ_REG_BAILOUT_INTERVAL);
 168                 r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 169         }
 170
 171         if (cnt > MAX_KIQ_REG_TRY)
 172                 goto failed_kiq;
 173
 174         return;
 175
 176 failed_kiq:
 177         pr_err("failed to write reg %x wait reg %x\n", reg0, reg1);
 178 }
 179
 180 /**
 181  * amdgpu_virt_request_full_gpu() - request full gpu access
 182  * @amdgpu:     amdgpu device.
 183  * @init:       is driver init time.
 184  * When start to init/fini driver, first need to request full gpu access.
 185  * Return: Zero if request success, otherwise will return error.
 186  */
 187 int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init)
 188 {
 189         struct amdgpu_virt *virt = &adev->virt;
 190         int r;
 191
 192         if (virt->ops && virt->ops->req_full_gpu) {
 193                 r = virt->ops->req_full_gpu(adev, init);
 194                 if (r)
 195                         return r;
 196
 197                 adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
 198         }
 199
 200         return 0;
 201 }
 202
 203 /**
 204  * amdgpu_virt_release_full_gpu() - release full gpu access
 205  * @amdgpu:     amdgpu device.
 206  * @init:       is driver init time.
 207  * When finishing driver init/fini, need to release full gpu access.
 208  * Return: Zero if release success, otherwise will returen error.
 209  */
 210 int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init)
 211 {
 212         struct amdgpu_virt *virt = &adev->virt;
 213         int r;
 214
 215         if (virt->ops && virt->ops->rel_full_gpu) {
 216                 r = virt->ops->rel_full_gpu(adev, init);
 217                 if (r)
 218                         return r;
 219
 220                 adev->virt.caps |= AMDGPU_SRIOV_CAPS_RUNTIME;
 221         }
 222         return 0;
 223 }
 224
 225 /**
 226  * amdgpu_virt_reset_gpu() - reset gpu
 227  * @amdgpu:     amdgpu device.
 228  * Send reset command to GPU hypervisor to reset GPU that VM is using
 229  * Return: Zero if reset success, otherwise will return error.
 230  */
 231 int amdgpu_virt_reset_gpu(struct amdgpu_device *adev)
 232 {
 233         struct amdgpu_virt *virt = &adev->virt;
 234         int r;
 235
 236         if (virt->ops && virt->ops->reset_gpu) {
 237                 r = virt->ops->reset_gpu(adev);
 238                 if (r)
 239                         return r;
 240
 241                 adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
 242         }
 243
 244         return 0;
 245 }
 246
 247 /**
 248  * amdgpu_virt_wait_reset() - wait for reset gpu completed
 249  * @amdgpu:     amdgpu device.
 250  * Wait for GPU reset completed.
 251  * Return: Zero if reset success, otherwise will return error.
 252  */
 253 int amdgpu_virt_wait_reset(struct amdgpu_device *adev)
 254 {
 255         struct amdgpu_virt *virt = &adev->virt;
 256
 257         if (!virt->ops || !virt->ops->wait_reset)
 258                 return -EINVAL;
 259
 260         return virt->ops->wait_reset(adev);
 261 }
 262
 263 /**
 264  * amdgpu_virt_alloc_mm_table() - alloc memory for mm table
 265  * @amdgpu:     amdgpu device.
 266  * MM table is used by UVD and VCE for its initialization
 267  * Return: Zero if allocate success.
 268  */
 269 int amdgpu_virt_alloc_mm_table(struct amdgpu_device *adev)
 270 {
 271         int r;
 272
 273         if (!amdgpu_sriov_vf(adev) || adev->virt.mm_table.gpu_addr)
 274                 return 0;
 275
 276         r = amdgpu_bo_create_kernel(adev, PAGE_SIZE, PAGE_SIZE,
 277                                     AMDGPU_GEM_DOMAIN_VRAM,
 278                                     &adev->virt.mm_table.bo,
 279                                     &adev->virt.mm_table.gpu_addr,
 280                                     (void *)&adev->virt.mm_table.cpu_addr);
 281         if (r) {
 282                 DRM_ERROR("failed to alloc mm table and error = %d.\n", r);
 283                 return r;
 284         }
 285
 286         memset((void *)adev->virt.mm_table.cpu_addr, 0, PAGE_SIZE);
 287         DRM_INFO("MM table gpu addr = 0x%llx, cpu addr = %p.\n",
 288                  adev->virt.mm_table.gpu_addr,
 289                  adev->virt.mm_table.cpu_addr);
 290         return 0;
 291 }
 292
 293 /**
 294  * amdgpu_virt_free_mm_table() - free mm table memory
 295  * @amdgpu:     amdgpu device.
 296  * Free MM table memory
 297  */
 298 void amdgpu_virt_free_mm_table(struct amdgpu_device *adev)
 299 {
 300         if (!amdgpu_sriov_vf(adev) || !adev->virt.mm_table.gpu_addr)
 301                 return;
 302
 303         amdgpu_bo_free_kernel(&adev->virt.mm_table.bo,
 304                               &adev->virt.mm_table.gpu_addr,
 305                               (void *)&adev->virt.mm_table.cpu_addr);
 306         adev->virt.mm_table.gpu_addr = 0;
 307 }
 308
 309
 310 int amdgpu_virt_fw_reserve_get_checksum(void *obj,
 311                                         unsigned long obj_size,
 312                                         unsigned int key,
 313                                         unsigned int chksum)
 314 {
 315         unsigned int ret = key;
 316         unsigned long i = 0;
 317         unsigned char *pos;
 318
 319         pos = (char *)obj;
 320         /* calculate checksum */
 321         for (i = 0; i < obj_size; ++i)
 322                 ret += *(pos + i);
 323         /* minus the chksum itself */
 324         pos = (char *)&chksum;
 325         for (i = 0; i < sizeof(chksum); ++i)
 326                 ret -= *(pos + i);
 327         return ret;
 328 }
 329
 330 void amdgpu_virt_init_data_exchange(struct amdgpu_device *adev)
 331 {
 332         uint32_t pf2vf_size = 0;
 333         uint32_t checksum = 0;
 334         uint32_t checkval;
 335         char *str;
 336
 337         adev->virt.fw_reserve.p_pf2vf = NULL;
 338         adev->virt.fw_reserve.p_vf2pf = NULL;
 339
 340         if (adev->fw_vram_usage.va != NULL) {
 341                 adev->virt.fw_reserve.p_pf2vf =
 342                         (struct amd_sriov_msg_pf2vf_info_header *)(
 343                         adev->fw_vram_usage.va + AMDGIM_DATAEXCHANGE_OFFSET);
 344                 AMDGPU_FW_VRAM_PF2VF_READ(adev, header.size, &pf2vf_size);
 345                 AMDGPU_FW_VRAM_PF2VF_READ(adev, checksum, &checksum);
 346                 AMDGPU_FW_VRAM_PF2VF_READ(adev, feature_flags, &adev->virt.gim_feature);
 347
 348                 /* pf2vf message must be in 4K */
 349                 if (pf2vf_size > 0 && pf2vf_size < 4096) {
 350                         checkval = amdgpu_virt_fw_reserve_get_checksum(
 351                                 adev->virt.fw_reserve.p_pf2vf, pf2vf_size,
 352                                 adev->virt.fw_reserve.checksum_key, checksum);
 353                         if (checkval == checksum) {
 354                                 adev->virt.fw_reserve.p_vf2pf =
 355                                         ((void *)adev->virt.fw_reserve.p_pf2vf +
 356                                         pf2vf_size);
 357                                 memset((void *)adev->virt.fw_reserve.p_vf2pf, 0,
 358                                         sizeof(amdgim_vf2pf_info));
 359                                 AMDGPU_FW_VRAM_VF2PF_WRITE(adev, header.version,
 360                                         AMDGPU_FW_VRAM_VF2PF_VER);
 361                                 AMDGPU_FW_VRAM_VF2PF_WRITE(adev, header.size,
 362                                         sizeof(amdgim_vf2pf_info));
 363                                 AMDGPU_FW_VRAM_VF2PF_READ(adev, driver_version,
 364                                         &str);
 365 #ifdef MODULE
 366                                 if (THIS_MODULE->version != NULL)
 367                                         strcpy(str, THIS_MODULE->version);
 368                                 else
 369 #endif
 370                                         strcpy(str, "N/A");
 371                                 AMDGPU_FW_VRAM_VF2PF_WRITE(adev, driver_cert,
 372                                         0);
 373                                 AMDGPU_FW_VRAM_VF2PF_WRITE(adev, checksum,
 374                                         amdgpu_virt_fw_reserve_get_checksum(
 375                                         adev->virt.fw_reserve.p_vf2pf,
 376                                         pf2vf_size,
 377                                         adev->virt.fw_reserve.checksum_key, 0));
 378                         }
 379                 }
 380         }
 381 }