/* * Copyright 2008 Advanced Micro Devices, Inc. * Copyright 2008 Red Hat Inc. * Copyright 2009 Jerome Glisse. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Dave Airlie * Alex Deucher * Jerome Glisse */ #include #include #include #include #include "amdgpu.h" void amdgpu_gem_object_free(struct drm_gem_object *gobj) { struct amdgpu_bo *robj = gem_to_amdgpu_bo(gobj); if (robj) { if (robj->gem_base.import_attach) drm_prime_gem_destroy(&robj->gem_base, robj->tbo.sg); amdgpu_mn_unregister(robj); amdgpu_bo_unref(&robj); } } int amdgpu_gem_object_create(struct amdgpu_device *adev, unsigned long size, int alignment, u32 initial_domain, u64 flags, bool kernel, struct drm_gem_object **obj) { struct amdgpu_bo *robj; unsigned long max_size; int r; *obj = NULL; /* At least align on page size */ if (alignment < PAGE_SIZE) { alignment = PAGE_SIZE; } if (!(initial_domain & (AMDGPU_GEM_DOMAIN_GDS | AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA))) { /* Maximum bo size is the unpinned gtt size since we use the gtt to * handle vram to system pool migrations. */ max_size = adev->mc.gtt_size - adev->gart_pin_size; if (size > max_size) { DRM_DEBUG("Allocation size %ldMb bigger than %ldMb limit\n", size >> 20, max_size >> 20); return -ENOMEM; } } retry: r = amdgpu_bo_create(adev, size, alignment, kernel, initial_domain, flags, NULL, NULL, &robj); if (r) { if (r != -ERESTARTSYS) { if (initial_domain == AMDGPU_GEM_DOMAIN_VRAM) { initial_domain |= AMDGPU_GEM_DOMAIN_GTT; goto retry; } DRM_ERROR("Failed to allocate GEM object (%ld, %d, %u, %d)\n", size, initial_domain, alignment, r); } return r; } *obj = &robj->gem_base; return 0; } void amdgpu_gem_force_release(struct amdgpu_device *adev) { struct drm_device *ddev = adev->ddev; struct drm_file *file; mutex_lock(&ddev->filelist_mutex); list_for_each_entry(file, &ddev->filelist, lhead) { struct drm_gem_object *gobj; int handle; WARN_ONCE(1, "Still active user space clients!\n"); spin_lock(&file->table_lock); idr_for_each_entry(&file->object_idr, gobj, handle) { WARN_ONCE(1, "And also active allocations!\n"); drm_gem_object_unreference_unlocked(gobj); } idr_destroy(&file->object_idr); spin_unlock(&file->table_lock); } mutex_unlock(&ddev->filelist_mutex); } /* * Call from drm_gem_handle_create which appear in both new and open ioctl * case. */ int amdgpu_gem_object_open(struct drm_gem_object *obj, struct drm_file *file_priv) { struct amdgpu_bo *abo = gem_to_amdgpu_bo(obj); struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev); struct amdgpu_fpriv *fpriv = file_priv->driver_priv; struct amdgpu_vm *vm = &fpriv->vm; struct amdgpu_bo_va *bo_va; int r; r = amdgpu_bo_reserve(abo, false); if (r) return r; bo_va = amdgpu_vm_bo_find(vm, abo); if (!bo_va) { bo_va = amdgpu_vm_bo_add(adev, vm, abo); } else { ++bo_va->ref_count; } amdgpu_bo_unreserve(abo); return 0; } void amdgpu_gem_object_close(struct drm_gem_object *obj, struct drm_file *file_priv) { struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); struct amdgpu_fpriv *fpriv = file_priv->driver_priv; struct amdgpu_vm *vm = &fpriv->vm; struct amdgpu_bo_list_entry vm_pd; struct list_head list, duplicates; struct ttm_validate_buffer tv; struct ww_acquire_ctx ticket; struct amdgpu_bo_va *bo_va; int r; INIT_LIST_HEAD(&list); INIT_LIST_HEAD(&duplicates); tv.bo = &bo->tbo; tv.shared = true; list_add(&tv.head, &list); amdgpu_vm_get_pd_bo(vm, &list, &vm_pd); r = ttm_eu_reserve_buffers(&ticket, &list, false, &duplicates); if (r) { dev_err(adev->dev, "leaking bo va because " "we fail to reserve bo (%d)\n", r); return; } bo_va = amdgpu_vm_bo_find(vm, bo); if (bo_va) { if (--bo_va->ref_count == 0) { amdgpu_vm_bo_rmv(adev, bo_va); } } ttm_eu_backoff_reservation(&ticket, &list); } static int amdgpu_gem_handle_lockup(struct amdgpu_device *adev, int r) { if (r == -EDEADLK) { r = amdgpu_gpu_reset(adev); if (!r) r = -EAGAIN; } return r; } /* * GEM ioctls. */ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { struct amdgpu_device *adev = dev->dev_private; union drm_amdgpu_gem_create *args = data; uint64_t size = args->in.bo_size; struct drm_gem_object *gobj; uint32_t handle; bool kernel = false; int r; /* reject invalid gem flags */ if (args->in.domain_flags & ~(AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED | AMDGPU_GEM_CREATE_NO_CPU_ACCESS | AMDGPU_GEM_CREATE_CPU_GTT_USWC | AMDGPU_GEM_CREATE_VRAM_CLEARED| AMDGPU_GEM_CREATE_SHADOW | AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)) { r = -EINVAL; goto error_unlock; } /* reject invalid gem domains */ if (args->in.domains & ~(AMDGPU_GEM_DOMAIN_CPU | AMDGPU_GEM_DOMAIN_GTT | AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GDS | AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) { r = -EINVAL; goto error_unlock; } /* create a gem object to contain this object in */ if (args->in.domains & (AMDGPU_GEM_DOMAIN_GDS | AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) { kernel = true; if (args->in.domains == AMDGPU_GEM_DOMAIN_GDS) size = size << AMDGPU_GDS_SHIFT; else if (args->in.domains == AMDGPU_GEM_DOMAIN_GWS) size = size << AMDGPU_GWS_SHIFT; else if (args->in.domains == AMDGPU_GEM_DOMAIN_OA) size = size << AMDGPU_OA_SHIFT; else { r = -EINVAL; goto error_unlock; } } size = roundup(size, PAGE_SIZE); r = amdgpu_gem_object_create(adev, size, args->in.alignment, (u32)(0xffffffff & args->in.domains), args->in.domain_flags, kernel, &gobj); if (r) goto error_unlock; r = drm_gem_handle_create(filp, gobj, &handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_unreference_unlocked(gobj); if (r) goto error_unlock; memset(args, 0, sizeof(*args)); args->out.handle = handle; return 0; error_unlock: r = amdgpu_gem_handle_lockup(adev, r); return r; } int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { struct amdgpu_device *adev = dev->dev_private; struct drm_amdgpu_gem_userptr *args = data; struct drm_gem_object *gobj; struct amdgpu_bo *bo; uint32_t handle; int r; if (offset_in_page(args->addr | args->size)) return -EINVAL; /* reject unknown flag values */ if (args->flags & ~(AMDGPU_GEM_USERPTR_READONLY | AMDGPU_GEM_USERPTR_ANONONLY | AMDGPU_GEM_USERPTR_VALIDATE | AMDGPU_GEM_USERPTR_REGISTER)) return -EINVAL; if (!(args->flags & AMDGPU_GEM_USERPTR_READONLY) && !(args->flags & AMDGPU_GEM_USERPTR_REGISTER)) { /* if we want to write to it we must install a MMU notifier */ return -EACCES; } /* create a gem object to contain this object in */ r = amdgpu_gem_object_create(adev, args->size, 0, AMDGPU_GEM_DOMAIN_CPU, 0, 0, &gobj); if (r) goto handle_lockup; bo = gem_to_amdgpu_bo(gobj); bo->prefered_domains = AMDGPU_GEM_DOMAIN_GTT; bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT; r = amdgpu_ttm_tt_set_userptr(bo->tbo.ttm, args->addr, args->flags); if (r) goto release_object; if (args->flags & AMDGPU_GEM_USERPTR_REGISTER) { r = amdgpu_mn_register(bo, args->addr); if (r) goto release_object; } if (args->flags & AMDGPU_GEM_USERPTR_VALIDATE) { down_read(¤t->mm->mmap_sem); r = amdgpu_ttm_tt_get_user_pages(bo->tbo.ttm, bo->tbo.ttm->pages); if (r) goto unlock_mmap_sem; r = amdgpu_bo_reserve(bo, true); if (r) goto free_pages; amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT); r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false); amdgpu_bo_unreserve(bo); if (r) goto free_pages; up_read(¤t->mm->mmap_sem); } r = drm_gem_handle_create(filp, gobj, &handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_unreference_unlocked(gobj); if (r) goto handle_lockup; args->handle = handle; return 0; free_pages: release_pages(bo->tbo.ttm->pages, bo->tbo.ttm->num_pages, false); unlock_mmap_sem: up_read(¤t->mm->mmap_sem); release_object: drm_gem_object_unreference_unlocked(gobj); handle_lockup: r = amdgpu_gem_handle_lockup(adev, r); return r; } int amdgpu_mode_dumb_mmap(struct drm_file *filp, struct drm_device *dev, uint32_t handle, uint64_t *offset_p) { struct drm_gem_object *gobj; struct amdgpu_bo *robj; gobj = drm_gem_object_lookup(filp, handle); if (gobj == NULL) { return -ENOENT; } robj = gem_to_amdgpu_bo(gobj); if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm) || (robj->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) { drm_gem_object_unreference_unlocked(gobj); return -EPERM; } *offset_p = amdgpu_bo_mmap_offset(robj); drm_gem_object_unreference_unlocked(gobj); return 0; } int amdgpu_gem_mmap_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { union drm_amdgpu_gem_mmap *args = data; uint32_t handle = args->in.handle; memset(args, 0, sizeof(*args)); return amdgpu_mode_dumb_mmap(filp, dev, handle, &args->out.addr_ptr); } /** * amdgpu_gem_timeout - calculate jiffies timeout from absolute value * * @timeout_ns: timeout in ns * * Calculate the timeout in jiffies from an absolute timeout in ns. */ unsigned long amdgpu_gem_timeout(uint64_t timeout_ns) { unsigned long timeout_jiffies; ktime_t timeout; /* clamp timeout if it's to large */ if (((int64_t)timeout_ns) < 0) return MAX_SCHEDULE_TIMEOUT; timeout = ktime_sub(ns_to_ktime(timeout_ns), ktime_get()); if (ktime_to_ns(timeout) < 0) return 0; timeout_jiffies = nsecs_to_jiffies(ktime_to_ns(timeout)); /* clamp timeout to avoid unsigned-> signed overflow */ if (timeout_jiffies > MAX_SCHEDULE_TIMEOUT ) return MAX_SCHEDULE_TIMEOUT - 1; return timeout_jiffies; } int amdgpu_gem_wait_idle_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { struct amdgpu_device *adev = dev->dev_private; union drm_amdgpu_gem_wait_idle *args = data; struct drm_gem_object *gobj; struct amdgpu_bo *robj; uint32_t handle = args->in.handle; unsigned long timeout = amdgpu_gem_timeout(args->in.timeout); int r = 0; long ret; gobj = drm_gem_object_lookup(filp, handle); if (gobj == NULL) { return -ENOENT; } robj = gem_to_amdgpu_bo(gobj); ret = reservation_object_wait_timeout_rcu(robj->tbo.resv, true, true, timeout); /* ret == 0 means not signaled, * ret > 0 means signaled * ret < 0 means interrupted before timeout */ if (ret >= 0) { memset(args, 0, sizeof(*args)); args->out.status = (ret == 0); } else r = ret; drm_gem_object_unreference_unlocked(gobj); r = amdgpu_gem_handle_lockup(adev, r); return r; } int amdgpu_gem_metadata_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { struct drm_amdgpu_gem_metadata *args = data; struct drm_gem_object *gobj; struct amdgpu_bo *robj; int r = -1; DRM_DEBUG("%d \n", args->handle); gobj = drm_gem_object_lookup(filp, args->handle); if (gobj == NULL) return -ENOENT; robj = gem_to_amdgpu_bo(gobj); r = amdgpu_bo_reserve(robj, false); if (unlikely(r != 0)) goto out; if (args->op == AMDGPU_GEM_METADATA_OP_GET_METADATA) { amdgpu_bo_get_tiling_flags(robj, &args->data.tiling_info); r = amdgpu_bo_get_metadata(robj, args->data.data, sizeof(args->data.data), &args->data.data_size_bytes, &args->data.flags); } else if (args->op == AMDGPU_GEM_METADATA_OP_SET_METADATA) { if (args->data.data_size_bytes > sizeof(args->data.data)) { r = -EINVAL; goto unreserve; } r = amdgpu_bo_set_tiling_flags(robj, args->data.tiling_info); if (!r) r = amdgpu_bo_set_metadata(robj, args->data.data, args->data.data_size_bytes, args->data.flags); } unreserve: amdgpu_bo_unreserve(robj); out: drm_gem_object_unreference_unlocked(gobj); return r; } static int amdgpu_gem_va_check(void *param, struct amdgpu_bo *bo) { /* if anything is swapped out don't swap it in here, just abort and wait for the next CS */ if (!amdgpu_bo_gpu_accessible(bo)) return -ERESTARTSYS; if (bo->shadow && !amdgpu_bo_gpu_accessible(bo->shadow)) return -ERESTARTSYS; return 0; } /** * amdgpu_gem_va_update_vm -update the bo_va in its VM * * @adev: amdgpu_device pointer * @bo_va: bo_va to update * @list: validation list * @operation: map or unmap * * Update the bo_va directly after setting its address. Errors are not * vital here, so they are not reported back to userspace. */ static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev, struct amdgpu_bo_va *bo_va, struct list_head *list, uint32_t operation) { struct ttm_validate_buffer *entry; int r = -ERESTARTSYS; list_for_each_entry(entry, list, head) { struct amdgpu_bo *bo = container_of(entry->bo, struct amdgpu_bo, tbo); if (amdgpu_gem_va_check(NULL, bo)) goto error; } r = amdgpu_vm_validate_pt_bos(adev, bo_va->vm, amdgpu_gem_va_check, NULL); if (r) goto error; r = amdgpu_vm_update_page_directory(adev, bo_va->vm); if (r) goto error; r = amdgpu_vm_clear_freed(adev, bo_va->vm); if (r) goto error; if (operation == AMDGPU_VA_OP_MAP) r = amdgpu_vm_bo_update(adev, bo_va, false); error: if (r && r != -ERESTARTSYS) DRM_ERROR("Couldn't update BO_VA (%d)\n", r); } int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { const uint32_t valid_flags = AMDGPU_VM_DELAY_UPDATE | AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE | AMDGPU_VM_PAGE_EXECUTABLE; const uint32_t prt_flags = AMDGPU_VM_DELAY_UPDATE | AMDGPU_VM_PAGE_PRT; struct drm_amdgpu_gem_va *args = data; struct drm_gem_object *gobj; struct amdgpu_device *adev = dev->dev_private; struct amdgpu_fpriv *fpriv = filp->driver_priv; struct amdgpu_bo *abo; struct amdgpu_bo_va *bo_va; struct amdgpu_bo_list_entry vm_pd; struct ttm_validate_buffer tv; struct ww_acquire_ctx ticket; struct list_head list; uint64_t va_flags; int r = 0; if (!adev->vm_manager.enabled) return -ENOTTY; if (args->va_address < AMDGPU_VA_RESERVED_SIZE) { dev_err(&dev->pdev->dev, "va_address 0x%lX is in reserved area 0x%X\n", (unsigned long)args->va_address, AMDGPU_VA_RESERVED_SIZE); return -EINVAL; } if ((args->flags & ~valid_flags) && (args->flags & ~prt_flags)) { dev_err(&dev->pdev->dev, "invalid flags combination 0x%08X\n", args->flags); return -EINVAL; } switch (args->operation) { case AMDGPU_VA_OP_MAP: case AMDGPU_VA_OP_UNMAP: break; default: dev_err(&dev->pdev->dev, "unsupported operation %d\n", args->operation); return -EINVAL; } INIT_LIST_HEAD(&list); if (!(args->flags & AMDGPU_VM_PAGE_PRT)) { gobj = drm_gem_object_lookup(filp, args->handle); if (gobj == NULL) return -ENOENT; abo = gem_to_amdgpu_bo(gobj); tv.bo = &abo->tbo; tv.shared = false; list_add(&tv.head, &list); } else { gobj = NULL; abo = NULL; } amdgpu_vm_get_pd_bo(&fpriv->vm, &list, &vm_pd); r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL); if (r) goto error_unref; if (abo) { bo_va = amdgpu_vm_bo_find(&fpriv->vm, abo); if (!bo_va) { r = -ENOENT; goto error_backoff; } } else { bo_va = fpriv->prt_va; } switch (args->operation) { case AMDGPU_VA_OP_MAP: va_flags = amdgpu_vm_get_pte_flags(adev, args->flags); r = amdgpu_vm_bo_map(adev, bo_va, args->va_address, args->offset_in_bo, args->map_size, va_flags); break; case AMDGPU_VA_OP_UNMAP: r = amdgpu_vm_bo_unmap(adev, bo_va, args->va_address); break; default: break; } if (!r && !(args->flags & AMDGPU_VM_DELAY_UPDATE) && !amdgpu_vm_debug) amdgpu_gem_va_update_vm(adev, bo_va, &list, args->operation); error_backoff: ttm_eu_backoff_reservation(&ticket, &list); error_unref: drm_gem_object_unreference_unlocked(gobj); return r; } int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) { struct drm_amdgpu_gem_op *args = data; struct drm_gem_object *gobj; struct amdgpu_bo *robj; int r; gobj = drm_gem_object_lookup(filp, args->handle); if (gobj == NULL) { return -ENOENT; } robj = gem_to_amdgpu_bo(gobj); r = amdgpu_bo_reserve(robj, false); if (unlikely(r)) goto out; switch (args->op) { case AMDGPU_GEM_OP_GET_GEM_CREATE_INFO: { struct drm_amdgpu_gem_create_in info; void __user *out = (void __user *)(long)args->value; info.bo_size = robj->gem_base.size; info.alignment = robj->tbo.mem.page_alignment << PAGE_SHIFT; info.domains = robj->prefered_domains; info.domain_flags = robj->flags; amdgpu_bo_unreserve(robj); if (copy_to_user(out, &info, sizeof(info))) r = -EFAULT; break; } case AMDGPU_GEM_OP_SET_PLACEMENT: if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm)) { r = -EPERM; amdgpu_bo_unreserve(robj); break; } robj->prefered_domains = args->value & (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT | AMDGPU_GEM_DOMAIN_CPU); robj->allowed_domains = robj->prefered_domains; if (robj->allowed_domains == AMDGPU_GEM_DOMAIN_VRAM) robj->allowed_domains |= AMDGPU_GEM_DOMAIN_GTT; amdgpu_bo_unreserve(robj); break; default: amdgpu_bo_unreserve(robj); r = -EINVAL; } out: drm_gem_object_unreference_unlocked(gobj); return r; } int amdgpu_mode_dumb_create(struct drm_file *file_priv, struct drm_device *dev, struct drm_mode_create_dumb *args) { struct amdgpu_device *adev = dev->dev_private; struct drm_gem_object *gobj; uint32_t handle; int r; args->pitch = amdgpu_align_pitch(adev, args->width, DIV_ROUND_UP(args->bpp, 8), 0); args->size = (u64)args->pitch * args->height; args->size = ALIGN(args->size, PAGE_SIZE); r = amdgpu_gem_object_create(adev, args->size, 0, AMDGPU_GEM_DOMAIN_VRAM, AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED, ttm_bo_type_device, &gobj); if (r) return -ENOMEM; r = drm_gem_handle_create(file_priv, gobj, &handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_unreference_unlocked(gobj); if (r) { return r; } args->handle = handle; return 0; } #if defined(CONFIG_DEBUG_FS) static int amdgpu_debugfs_gem_bo_info(int id, void *ptr, void *data) { struct drm_gem_object *gobj = ptr; struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj); struct seq_file *m = data; unsigned domain; const char *placement; unsigned pin_count; domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type); switch (domain) { case AMDGPU_GEM_DOMAIN_VRAM: placement = "VRAM"; break; case AMDGPU_GEM_DOMAIN_GTT: placement = " GTT"; break; case AMDGPU_GEM_DOMAIN_CPU: default: placement = " CPU"; break; } seq_printf(m, "\t0x%08x: %12ld byte %s @ 0x%010Lx", id, amdgpu_bo_size(bo), placement, amdgpu_bo_gpu_offset(bo)); pin_count = ACCESS_ONCE(bo->pin_count); if (pin_count) seq_printf(m, " pin count %d", pin_count); seq_printf(m, "\n"); return 0; } static int amdgpu_debugfs_gem_info(struct seq_file *m, void *data) { struct drm_info_node *node = (struct drm_info_node *)m->private; struct drm_device *dev = node->minor->dev; struct drm_file *file; int r; r = mutex_lock_interruptible(&dev->filelist_mutex); if (r) return r; list_for_each_entry(file, &dev->filelist, lhead) { struct task_struct *task; /* * Although we have a valid reference on file->pid, that does * not guarantee that the task_struct who called get_pid() is * still alive (e.g. get_pid(current) => fork() => exit()). * Therefore, we need to protect this ->comm access using RCU. */ rcu_read_lock(); task = pid_task(file->pid, PIDTYPE_PID); seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid), task ? task->comm : ""); rcu_read_unlock(); spin_lock(&file->table_lock); idr_for_each(&file->object_idr, amdgpu_debugfs_gem_bo_info, m); spin_unlock(&file->table_lock); } mutex_unlock(&dev->filelist_mutex); return 0; } static const struct drm_info_list amdgpu_debugfs_gem_list[] = { {"amdgpu_gem_info", &amdgpu_debugfs_gem_info, 0, NULL}, }; #endif int amdgpu_gem_debugfs_init(struct amdgpu_device *adev) { #if defined(CONFIG_DEBUG_FS) return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_gem_list, 1); #endif return 0; }