[PATCH v3 06/16] drm/amdkfd: CRIU Implement KFD resume ioctl
David Yat Sin
david.yatsin at amd.com
Wed Sep 29 12:00:28 UTC 2021
From: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
This adds support to create userptr BOs on restore and introduces a new
ioctl to restart memory notifiers for the restored userptr BOs.
When doing CRIU restore MMU notifications can happen anytime after we call
amdgpu_mn_register. Prevent MMU notifications until we reach stage-4 of the
restore process i.e. criu_resume ioctl is received, and the process is
ready to be resumed. This ioctl is different from other KFD CRIU ioctls
since its called by CRIU master restore process for all the target
processes being resumed by CRIU.
Signed-off-by: David Yat Sin <david.yatsin at amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 6 ++-
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 51 +++++++++++++++++--
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 45 ++++++++++++++--
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 +
drivers/gpu/drm/amd/amdkfd/kfd_process.c | 35 +++++++++++--
5 files changed, 124 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 3bc52b2c604f..3837cec6617d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -131,6 +131,7 @@ struct amdkfd_process_info {
atomic_t evicted_bos;
struct delayed_work restore_userptr_work;
struct pid *pid;
+ bool block_mmu_notifications;
};
int amdgpu_amdkfd_init(void);
@@ -267,7 +268,7 @@ uint64_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *drm_priv);
int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
struct kgd_dev *kgd, uint64_t va, uint64_t size,
void *drm_priv, struct kgd_mem **mem,
- uint64_t *offset, uint32_t flags);
+ uint64_t *offset, uint32_t flags, bool criu_resume);
int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv,
uint64_t *size);
@@ -290,6 +291,9 @@ int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
uint64_t *mmap_offset);
int amdgpu_amdkfd_get_tile_config(struct kgd_dev *kgd,
struct tile_config *config);
+void amdgpu_amdkfd_block_mmu_notifications(void *p);
+int amdgpu_amdkfd_criu_resume(void *p);
+
#if IS_ENABLED(CONFIG_HSA_AMD)
void amdgpu_amdkfd_gpuvm_init_mem_limits(void);
void amdgpu_amdkfd_gpuvm_destroy_cb(struct amdgpu_device *adev,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 2d6b2d77b738..8465361ce716 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -819,7 +819,8 @@ static void remove_kgd_mem_from_kfd_bo_list(struct kgd_mem *mem,
*
* Returns 0 for success, negative errno for errors.
*/
-static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr)
+static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr,
+ bool criu_resume)
{
struct amdkfd_process_info *process_info = mem->process_info;
struct amdgpu_bo *bo = mem->bo;
@@ -841,6 +842,17 @@ static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr)
goto out;
}
+ if (criu_resume) {
+ /*
+ * During a CRIU restore operation, the userptr buffer objects
+ * will be validated in the restore_userptr_work worker at a
+ * later stage when it is scheduled by another ioctl called by
+ * CRIU master process for the target pid for restore.
+ */
+ atomic_inc(&mem->invalid);
+ mutex_unlock(&process_info->lock);
+ return 0;
+ }
ret = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages);
if (ret) {
pr_err("%s: Failed to get user pages: %d\n", __func__, ret);
@@ -1213,6 +1225,7 @@ static int init_kfd_vm(struct amdgpu_vm *vm, void **process_info,
INIT_DELAYED_WORK(&info->restore_userptr_work,
amdgpu_amdkfd_restore_userptr_worker);
+ info->block_mmu_notifications = false;
*process_info = info;
*ef = dma_fence_get(&info->eviction_fence->base);
}
@@ -1381,10 +1394,37 @@ uint64_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *drm_priv)
return avm->pd_phys_addr;
}
+void amdgpu_amdkfd_block_mmu_notifications(void *p)
+{
+ struct amdkfd_process_info *pinfo = (struct amdkfd_process_info *)p;
+
+ pinfo->block_mmu_notifications = true;
+}
+
+int amdgpu_amdkfd_criu_resume(void *p)
+{
+ int ret = 0;
+ struct amdkfd_process_info *pinfo = (struct amdkfd_process_info *)p;
+
+ mutex_lock(&pinfo->lock);
+ pr_debug("scheduling work\n");
+ atomic_inc(&pinfo->evicted_bos);
+ if (!pinfo->block_mmu_notifications) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+ pinfo->block_mmu_notifications = false;
+ schedule_delayed_work(&pinfo->restore_userptr_work, 0);
+
+out_unlock:
+ mutex_unlock(&pinfo->lock);
+ return ret;
+}
+
int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
struct kgd_dev *kgd, uint64_t va, uint64_t size,
void *drm_priv, struct kgd_mem **mem,
- uint64_t *offset, uint32_t flags)
+ uint64_t *offset, uint32_t flags, bool criu_resume)
{
struct amdgpu_device *adev = get_amdgpu_device(kgd);
struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
@@ -1488,7 +1528,8 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, user_addr);
if (user_addr) {
- ret = init_user_pages(*mem, user_addr);
+ pr_debug("creating userptr BO for user_addr = %llu\n", user_addr);
+ ret = init_user_pages(*mem, user_addr, criu_resume);
if (ret)
goto allocate_init_user_pages_failed;
}
@@ -1968,6 +2009,10 @@ int amdgpu_amdkfd_evict_userptr(struct kgd_mem *mem,
int evicted_bos;
int r = 0;
+ /* Do not process MMU notifications until stage-4 IOCTL is received */
+ if (process_info->block_mmu_notifications)
+ return 0;
+
atomic_inc(&mem->invalid);
evicted_bos = atomic_inc_return(&process_info->evicted_bos);
if (evicted_bos == 1) {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index e5a6a98eae45..668772a67f7a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1319,7 +1319,7 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
dev->kgd, args->va_addr, args->size,
pdd->drm_priv, (struct kgd_mem **) &mem, &offset,
- flags);
+ flags, false);
if (err)
goto err_unlock;
@@ -2101,6 +2101,7 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
{
struct kfd_criu_bo_bucket *bo_buckets;
uint8_t *objects, *private_data;
+ const bool criu_resume = true;
bool flush_tlbs = false;
int ret = 0, i, j = 0;
@@ -2110,6 +2111,9 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
return -EINVAL;
}
+ /* Prevent MMU notifications until stage-4 IOCTL (CRIU_RESUME) is received */
+ amdgpu_amdkfd_block_mmu_notifications(p->kgd_process_info);
+
objects = kmalloc(args->objects_size, GFP_KERNEL);
if (!objects)
return -ENOMEM;
@@ -2188,6 +2192,7 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
offset = bo_priv->user_addr;
}
+
/* Create the BO */
ret = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(dev->kgd,
bo_bucket->addr,
@@ -2195,7 +2200,8 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
pdd->drm_priv,
(struct kgd_mem **) &mem,
&offset,
- bo_bucket->alloc_flags);
+ bo_bucket->alloc_flags,
+ criu_resume);
if (ret) {
pr_err("Could not create the BO\n");
ret = -ENOMEM;
@@ -2213,8 +2219,8 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
pr_err("Could not allocate idr\n");
amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd,
(struct kgd_mem *)mem,
- pdd->drm_priv, NULL);
-
+ pdd->drm_priv,
+ NULL);
ret = -ENOMEM;
goto exit;
}
@@ -2260,6 +2266,7 @@ static int criu_restore_bos(struct kfd_process *p, struct kfd_ioctl_criu_restore
}
pr_debug("map mem in restore ioctl -> 0x%llx\n",
((struct kgd_mem *)mem)->va);
+
ret = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(peer->kgd,
(struct kgd_mem *)mem, peer_pdd->drm_priv, &table_freed);
if (ret) {
@@ -2362,7 +2369,35 @@ static int kfd_ioctl_criu_pause(struct file *filep, struct kfd_process *p, void
static int kfd_ioctl_criu_resume(struct file *filep,
struct kfd_process *p, void *data)
{
- return 0;
+ struct kfd_ioctl_criu_resume_args *args = data;
+ struct kfd_process *target = NULL;
+ struct pid *pid = NULL;
+ int ret = 0;
+
+ pr_debug("Inside %s, target pid for criu restore: %d\n", __func__,
+ args->pid);
+
+ pid = find_get_pid(args->pid);
+ if (!pid) {
+ pr_err("Cannot find pid info for %i\n", args->pid);
+ return -ESRCH;
+ }
+
+ pr_debug("calling kfd_lookup_process_by_pid\n");
+ target = kfd_lookup_process_by_pid(pid);
+ if (!target) {
+ pr_debug("Cannot find process info for %i\n", args->pid);
+ put_pid(pid);
+ return -ESRCH;
+ }
+
+ mutex_lock(&target->mutex);
+ ret = amdgpu_amdkfd_criu_resume(target->kgd_process_info);
+ mutex_unlock(&target->mutex);
+
+ put_pid(pid);
+ kfd_unref_process(target);
+ return ret;
}
static int kfd_ioctl_criu_process_info(struct file *filep,
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 5940d594b420..881af8e1b06c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -942,6 +942,7 @@ void *kfd_process_device_translate_handle(struct kfd_process_device *p,
int handle);
void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
int handle);
+struct kfd_process *kfd_lookup_process_by_pid(struct pid *pid);
bool kfd_has_process_device_data(struct kfd_process *p);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 9f2b4d8a5247..65a389fb97ce 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -64,7 +64,8 @@ static struct workqueue_struct *kfd_process_wq;
*/
static struct workqueue_struct *kfd_restore_wq;
-static struct kfd_process *find_process(const struct task_struct *thread);
+static struct kfd_process *find_process(const struct task_struct *thread,
+ bool ref);
static void kfd_process_ref_release(struct kref *ref);
static struct kfd_process *create_process(const struct task_struct *thread);
static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep);
@@ -710,7 +711,7 @@ static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
int err;
err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(kdev->kgd, gpu_va, size,
- pdd->drm_priv, &mem, NULL, flags);
+ pdd->drm_priv, &mem, NULL, flags, false);
if (err)
goto err_alloc_mem;
@@ -814,7 +815,7 @@ struct kfd_process *kfd_create_process(struct file *filep)
mutex_lock(&kfd_processes_mutex);
/* A prior open of /dev/kfd could have already created the process. */
- process = find_process(thread);
+ process = find_process(thread, false);
if (process) {
pr_debug("Process already found\n");
} else {
@@ -882,7 +883,7 @@ struct kfd_process *kfd_get_process(const struct task_struct *thread)
if (thread->group_leader->mm != thread->mm)
return ERR_PTR(-EINVAL);
- process = find_process(thread);
+ process = find_process(thread, false);
if (!process)
return ERR_PTR(-EINVAL);
@@ -901,13 +902,16 @@ static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
return NULL;
}
-static struct kfd_process *find_process(const struct task_struct *thread)
+static struct kfd_process *find_process(const struct task_struct *thread,
+ bool ref)
{
struct kfd_process *p;
int idx;
idx = srcu_read_lock(&kfd_processes_srcu);
p = find_process_by_mm(thread->mm);
+ if (p && ref)
+ kref_get(&p->ref);
srcu_read_unlock(&kfd_processes_srcu, idx);
return p;
@@ -1625,6 +1629,27 @@ void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
idr_remove(&pdd->alloc_idr, handle);
}
+/* This increments the process->ref counter. */
+struct kfd_process *kfd_lookup_process_by_pid(struct pid *pid)
+{
+ struct task_struct *task = NULL;
+ struct kfd_process *p = NULL;
+
+ if (!pid) {
+ task = current;
+ get_task_struct(task);
+ } else {
+ task = get_pid_task(pid, PIDTYPE_PID);
+ }
+
+ if (task) {
+ p = find_process(task, true);
+ put_task_struct(task);
+ }
+
+ return p;
+}
+
/* This increments the process->ref counter. */
struct kfd_process *kfd_lookup_process_by_pasid(u32 pasid)
{
--
2.17.1
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