diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_process.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_process.c | 2268 |
1 files changed, 2268 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c new file mode 100644 index 000000000..fbf053001 --- /dev/null +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -0,0 +1,2268 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright 2014-2022 Advanced Micro Devices, Inc. + * + * 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. + */ + +#include <linux/mutex.h> +#include <linux/log2.h> +#include <linux/sched.h> +#include <linux/sched/mm.h> +#include <linux/sched/task.h> +#include <linux/mmu_context.h> +#include <linux/slab.h> +#include <linux/notifier.h> +#include <linux/compat.h> +#include <linux/mman.h> +#include <linux/file.h> +#include <linux/pm_runtime.h> +#include "amdgpu_amdkfd.h" +#include "amdgpu.h" + +struct mm_struct; + +#include "kfd_priv.h" +#include "kfd_device_queue_manager.h" +#include "kfd_svm.h" +#include "kfd_smi_events.h" +#include "kfd_debug.h" + +/* + * List of struct kfd_process (field kfd_process). + * Unique/indexed by mm_struct* + */ +DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE); +DEFINE_MUTEX(kfd_processes_mutex); + +DEFINE_SRCU(kfd_processes_srcu); + +/* For process termination handling */ +static struct workqueue_struct *kfd_process_wq; + +/* Ordered, single-threaded workqueue for restoring evicted + * processes. Restoring multiple processes concurrently under memory + * pressure can lead to processes blocking each other from validating + * their BOs and result in a live-lock situation where processes + * remain evicted indefinitely. + */ +static struct workqueue_struct *kfd_restore_wq; + +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 void evict_process_worker(struct work_struct *work); +static void restore_process_worker(struct work_struct *work); + +static void kfd_process_device_destroy_cwsr_dgpu(struct kfd_process_device *pdd); + +struct kfd_procfs_tree { + struct kobject *kobj; +}; + +static struct kfd_procfs_tree procfs; + +/* + * Structure for SDMA activity tracking + */ +struct kfd_sdma_activity_handler_workarea { + struct work_struct sdma_activity_work; + struct kfd_process_device *pdd; + uint64_t sdma_activity_counter; +}; + +struct temp_sdma_queue_list { + uint64_t __user *rptr; + uint64_t sdma_val; + unsigned int queue_id; + struct list_head list; +}; + +static void kfd_sdma_activity_worker(struct work_struct *work) +{ + struct kfd_sdma_activity_handler_workarea *workarea; + struct kfd_process_device *pdd; + uint64_t val; + struct mm_struct *mm; + struct queue *q; + struct qcm_process_device *qpd; + struct device_queue_manager *dqm; + int ret = 0; + struct temp_sdma_queue_list sdma_q_list; + struct temp_sdma_queue_list *sdma_q, *next; + + workarea = container_of(work, struct kfd_sdma_activity_handler_workarea, + sdma_activity_work); + + pdd = workarea->pdd; + if (!pdd) + return; + dqm = pdd->dev->dqm; + qpd = &pdd->qpd; + if (!dqm || !qpd) + return; + /* + * Total SDMA activity is current SDMA activity + past SDMA activity + * Past SDMA count is stored in pdd. + * To get the current activity counters for all active SDMA queues, + * we loop over all SDMA queues and get their counts from user-space. + * + * We cannot call get_user() with dqm_lock held as it can cause + * a circular lock dependency situation. To read the SDMA stats, + * we need to do the following: + * + * 1. Create a temporary list of SDMA queue nodes from the qpd->queues_list, + * with dqm_lock/dqm_unlock(). + * 2. Call get_user() for each node in temporary list without dqm_lock. + * Save the SDMA count for each node and also add the count to the total + * SDMA count counter. + * Its possible, during this step, a few SDMA queue nodes got deleted + * from the qpd->queues_list. + * 3. Do a second pass over qpd->queues_list to check if any nodes got deleted. + * If any node got deleted, its SDMA count would be captured in the sdma + * past activity counter. So subtract the SDMA counter stored in step 2 + * for this node from the total SDMA count. + */ + INIT_LIST_HEAD(&sdma_q_list.list); + + /* + * Create the temp list of all SDMA queues + */ + dqm_lock(dqm); + + list_for_each_entry(q, &qpd->queues_list, list) { + if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) && + (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI)) + continue; + + sdma_q = kzalloc(sizeof(struct temp_sdma_queue_list), GFP_KERNEL); + if (!sdma_q) { + dqm_unlock(dqm); + goto cleanup; + } + + INIT_LIST_HEAD(&sdma_q->list); + sdma_q->rptr = (uint64_t __user *)q->properties.read_ptr; + sdma_q->queue_id = q->properties.queue_id; + list_add_tail(&sdma_q->list, &sdma_q_list.list); + } + + /* + * If the temp list is empty, then no SDMA queues nodes were found in + * qpd->queues_list. Return the past activity count as the total sdma + * count + */ + if (list_empty(&sdma_q_list.list)) { + workarea->sdma_activity_counter = pdd->sdma_past_activity_counter; + dqm_unlock(dqm); + return; + } + + dqm_unlock(dqm); + + /* + * Get the usage count for each SDMA queue in temp_list. + */ + mm = get_task_mm(pdd->process->lead_thread); + if (!mm) + goto cleanup; + + kthread_use_mm(mm); + + list_for_each_entry(sdma_q, &sdma_q_list.list, list) { + val = 0; + ret = read_sdma_queue_counter(sdma_q->rptr, &val); + if (ret) { + pr_debug("Failed to read SDMA queue active counter for queue id: %d", + sdma_q->queue_id); + } else { + sdma_q->sdma_val = val; + workarea->sdma_activity_counter += val; + } + } + + kthread_unuse_mm(mm); + mmput(mm); + + /* + * Do a second iteration over qpd_queues_list to check if any SDMA + * nodes got deleted while fetching SDMA counter. + */ + dqm_lock(dqm); + + workarea->sdma_activity_counter += pdd->sdma_past_activity_counter; + + list_for_each_entry(q, &qpd->queues_list, list) { + if (list_empty(&sdma_q_list.list)) + break; + + if ((q->properties.type != KFD_QUEUE_TYPE_SDMA) && + (q->properties.type != KFD_QUEUE_TYPE_SDMA_XGMI)) + continue; + + list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { + if (((uint64_t __user *)q->properties.read_ptr == sdma_q->rptr) && + (sdma_q->queue_id == q->properties.queue_id)) { + list_del(&sdma_q->list); + kfree(sdma_q); + break; + } + } + } + + dqm_unlock(dqm); + + /* + * If temp list is not empty, it implies some queues got deleted + * from qpd->queues_list during SDMA usage read. Subtract the SDMA + * count for each node from the total SDMA count. + */ + list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { + workarea->sdma_activity_counter -= sdma_q->sdma_val; + list_del(&sdma_q->list); + kfree(sdma_q); + } + + return; + +cleanup: + list_for_each_entry_safe(sdma_q, next, &sdma_q_list.list, list) { + list_del(&sdma_q->list); + kfree(sdma_q); + } +} + +/** + * kfd_get_cu_occupancy - Collect number of waves in-flight on this device + * by current process. Translates acquired wave count into number of compute units + * that are occupied. + * + * @attr: Handle of attribute that allows reporting of wave count. The attribute + * handle encapsulates GPU device it is associated with, thereby allowing collection + * of waves in flight, etc + * @buffer: Handle of user provided buffer updated with wave count + * + * Return: Number of bytes written to user buffer or an error value + */ +static int kfd_get_cu_occupancy(struct attribute *attr, char *buffer) +{ + int cu_cnt; + int wave_cnt; + int max_waves_per_cu; + struct kfd_node *dev = NULL; + struct kfd_process *proc = NULL; + struct kfd_process_device *pdd = NULL; + + pdd = container_of(attr, struct kfd_process_device, attr_cu_occupancy); + dev = pdd->dev; + if (dev->kfd2kgd->get_cu_occupancy == NULL) + return -EINVAL; + + cu_cnt = 0; + proc = pdd->process; + if (pdd->qpd.queue_count == 0) { + pr_debug("Gpu-Id: %d has no active queues for process %d\n", + dev->id, proc->pasid); + return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt); + } + + /* Collect wave count from device if it supports */ + wave_cnt = 0; + max_waves_per_cu = 0; + dev->kfd2kgd->get_cu_occupancy(dev->adev, proc->pasid, &wave_cnt, + &max_waves_per_cu, 0); + + /* Translate wave count to number of compute units */ + cu_cnt = (wave_cnt + (max_waves_per_cu - 1)) / max_waves_per_cu; + return snprintf(buffer, PAGE_SIZE, "%d\n", cu_cnt); +} + +static ssize_t kfd_procfs_show(struct kobject *kobj, struct attribute *attr, + char *buffer) +{ + if (strcmp(attr->name, "pasid") == 0) { + struct kfd_process *p = container_of(attr, struct kfd_process, + attr_pasid); + + return snprintf(buffer, PAGE_SIZE, "%d\n", p->pasid); + } else if (strncmp(attr->name, "vram_", 5) == 0) { + struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device, + attr_vram); + return snprintf(buffer, PAGE_SIZE, "%llu\n", READ_ONCE(pdd->vram_usage)); + } else if (strncmp(attr->name, "sdma_", 5) == 0) { + struct kfd_process_device *pdd = container_of(attr, struct kfd_process_device, + attr_sdma); + struct kfd_sdma_activity_handler_workarea sdma_activity_work_handler; + + INIT_WORK(&sdma_activity_work_handler.sdma_activity_work, + kfd_sdma_activity_worker); + + sdma_activity_work_handler.pdd = pdd; + sdma_activity_work_handler.sdma_activity_counter = 0; + + schedule_work(&sdma_activity_work_handler.sdma_activity_work); + + flush_work(&sdma_activity_work_handler.sdma_activity_work); + + return snprintf(buffer, PAGE_SIZE, "%llu\n", + (sdma_activity_work_handler.sdma_activity_counter)/ + SDMA_ACTIVITY_DIVISOR); + } else { + pr_err("Invalid attribute"); + return -EINVAL; + } + + return 0; +} + +static void kfd_procfs_kobj_release(struct kobject *kobj) +{ + kfree(kobj); +} + +static const struct sysfs_ops kfd_procfs_ops = { + .show = kfd_procfs_show, +}; + +static const struct kobj_type procfs_type = { + .release = kfd_procfs_kobj_release, + .sysfs_ops = &kfd_procfs_ops, +}; + +void kfd_procfs_init(void) +{ + int ret = 0; + + procfs.kobj = kfd_alloc_struct(procfs.kobj); + if (!procfs.kobj) + return; + + ret = kobject_init_and_add(procfs.kobj, &procfs_type, + &kfd_device->kobj, "proc"); + if (ret) { + pr_warn("Could not create procfs proc folder"); + /* If we fail to create the procfs, clean up */ + kfd_procfs_shutdown(); + } +} + +void kfd_procfs_shutdown(void) +{ + if (procfs.kobj) { + kobject_del(procfs.kobj); + kobject_put(procfs.kobj); + procfs.kobj = NULL; + } +} + +static ssize_t kfd_procfs_queue_show(struct kobject *kobj, + struct attribute *attr, char *buffer) +{ + struct queue *q = container_of(kobj, struct queue, kobj); + + if (!strcmp(attr->name, "size")) + return snprintf(buffer, PAGE_SIZE, "%llu", + q->properties.queue_size); + else if (!strcmp(attr->name, "type")) + return snprintf(buffer, PAGE_SIZE, "%d", q->properties.type); + else if (!strcmp(attr->name, "gpuid")) + return snprintf(buffer, PAGE_SIZE, "%u", q->device->id); + else + pr_err("Invalid attribute"); + + return 0; +} + +static ssize_t kfd_procfs_stats_show(struct kobject *kobj, + struct attribute *attr, char *buffer) +{ + if (strcmp(attr->name, "evicted_ms") == 0) { + struct kfd_process_device *pdd = container_of(attr, + struct kfd_process_device, + attr_evict); + uint64_t evict_jiffies; + + evict_jiffies = atomic64_read(&pdd->evict_duration_counter); + + return snprintf(buffer, + PAGE_SIZE, + "%llu\n", + jiffies64_to_msecs(evict_jiffies)); + + /* Sysfs handle that gets CU occupancy is per device */ + } else if (strcmp(attr->name, "cu_occupancy") == 0) { + return kfd_get_cu_occupancy(attr, buffer); + } else { + pr_err("Invalid attribute"); + } + + return 0; +} + +static ssize_t kfd_sysfs_counters_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + struct kfd_process_device *pdd; + + if (!strcmp(attr->name, "faults")) { + pdd = container_of(attr, struct kfd_process_device, + attr_faults); + return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->faults)); + } + if (!strcmp(attr->name, "page_in")) { + pdd = container_of(attr, struct kfd_process_device, + attr_page_in); + return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_in)); + } + if (!strcmp(attr->name, "page_out")) { + pdd = container_of(attr, struct kfd_process_device, + attr_page_out); + return sysfs_emit(buf, "%llu\n", READ_ONCE(pdd->page_out)); + } + return 0; +} + +static struct attribute attr_queue_size = { + .name = "size", + .mode = KFD_SYSFS_FILE_MODE +}; + +static struct attribute attr_queue_type = { + .name = "type", + .mode = KFD_SYSFS_FILE_MODE +}; + +static struct attribute attr_queue_gpuid = { + .name = "gpuid", + .mode = KFD_SYSFS_FILE_MODE +}; + +static struct attribute *procfs_queue_attrs[] = { + &attr_queue_size, + &attr_queue_type, + &attr_queue_gpuid, + NULL +}; +ATTRIBUTE_GROUPS(procfs_queue); + +static const struct sysfs_ops procfs_queue_ops = { + .show = kfd_procfs_queue_show, +}; + +static const struct kobj_type procfs_queue_type = { + .sysfs_ops = &procfs_queue_ops, + .default_groups = procfs_queue_groups, +}; + +static const struct sysfs_ops procfs_stats_ops = { + .show = kfd_procfs_stats_show, +}; + +static const struct kobj_type procfs_stats_type = { + .sysfs_ops = &procfs_stats_ops, + .release = kfd_procfs_kobj_release, +}; + +static const struct sysfs_ops sysfs_counters_ops = { + .show = kfd_sysfs_counters_show, +}; + +static const struct kobj_type sysfs_counters_type = { + .sysfs_ops = &sysfs_counters_ops, + .release = kfd_procfs_kobj_release, +}; + +int kfd_procfs_add_queue(struct queue *q) +{ + struct kfd_process *proc; + int ret; + + if (!q || !q->process) + return -EINVAL; + proc = q->process; + + /* Create proc/<pid>/queues/<queue id> folder */ + if (!proc->kobj_queues) + return -EFAULT; + ret = kobject_init_and_add(&q->kobj, &procfs_queue_type, + proc->kobj_queues, "%u", q->properties.queue_id); + if (ret < 0) { + pr_warn("Creating proc/<pid>/queues/%u failed", + q->properties.queue_id); + kobject_put(&q->kobj); + return ret; + } + + return 0; +} + +static void kfd_sysfs_create_file(struct kobject *kobj, struct attribute *attr, + char *name) +{ + int ret; + + if (!kobj || !attr || !name) + return; + + attr->name = name; + attr->mode = KFD_SYSFS_FILE_MODE; + sysfs_attr_init(attr); + + ret = sysfs_create_file(kobj, attr); + if (ret) + pr_warn("Create sysfs %s/%s failed %d", kobj->name, name, ret); +} + +static void kfd_procfs_add_sysfs_stats(struct kfd_process *p) +{ + int ret; + int i; + char stats_dir_filename[MAX_SYSFS_FILENAME_LEN]; + + if (!p || !p->kobj) + return; + + /* + * Create sysfs files for each GPU: + * - proc/<pid>/stats_<gpuid>/ + * - proc/<pid>/stats_<gpuid>/evicted_ms + * - proc/<pid>/stats_<gpuid>/cu_occupancy + */ + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + snprintf(stats_dir_filename, MAX_SYSFS_FILENAME_LEN, + "stats_%u", pdd->dev->id); + pdd->kobj_stats = kfd_alloc_struct(pdd->kobj_stats); + if (!pdd->kobj_stats) + return; + + ret = kobject_init_and_add(pdd->kobj_stats, + &procfs_stats_type, + p->kobj, + stats_dir_filename); + + if (ret) { + pr_warn("Creating KFD proc/stats_%s folder failed", + stats_dir_filename); + kobject_put(pdd->kobj_stats); + pdd->kobj_stats = NULL; + return; + } + + kfd_sysfs_create_file(pdd->kobj_stats, &pdd->attr_evict, + "evicted_ms"); + /* Add sysfs file to report compute unit occupancy */ + if (pdd->dev->kfd2kgd->get_cu_occupancy) + kfd_sysfs_create_file(pdd->kobj_stats, + &pdd->attr_cu_occupancy, + "cu_occupancy"); + } +} + +static void kfd_procfs_add_sysfs_counters(struct kfd_process *p) +{ + int ret = 0; + int i; + char counters_dir_filename[MAX_SYSFS_FILENAME_LEN]; + + if (!p || !p->kobj) + return; + + /* + * Create sysfs files for each GPU which supports SVM + * - proc/<pid>/counters_<gpuid>/ + * - proc/<pid>/counters_<gpuid>/faults + * - proc/<pid>/counters_<gpuid>/page_in + * - proc/<pid>/counters_<gpuid>/page_out + */ + for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) { + struct kfd_process_device *pdd = p->pdds[i]; + struct kobject *kobj_counters; + + snprintf(counters_dir_filename, MAX_SYSFS_FILENAME_LEN, + "counters_%u", pdd->dev->id); + kobj_counters = kfd_alloc_struct(kobj_counters); + if (!kobj_counters) + return; + + ret = kobject_init_and_add(kobj_counters, &sysfs_counters_type, + p->kobj, counters_dir_filename); + if (ret) { + pr_warn("Creating KFD proc/%s folder failed", + counters_dir_filename); + kobject_put(kobj_counters); + return; + } + + pdd->kobj_counters = kobj_counters; + kfd_sysfs_create_file(kobj_counters, &pdd->attr_faults, + "faults"); + kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_in, + "page_in"); + kfd_sysfs_create_file(kobj_counters, &pdd->attr_page_out, + "page_out"); + } +} + +static void kfd_procfs_add_sysfs_files(struct kfd_process *p) +{ + int i; + + if (!p || !p->kobj) + return; + + /* + * Create sysfs files for each GPU: + * - proc/<pid>/vram_<gpuid> + * - proc/<pid>/sdma_<gpuid> + */ + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + snprintf(pdd->vram_filename, MAX_SYSFS_FILENAME_LEN, "vram_%u", + pdd->dev->id); + kfd_sysfs_create_file(p->kobj, &pdd->attr_vram, + pdd->vram_filename); + + snprintf(pdd->sdma_filename, MAX_SYSFS_FILENAME_LEN, "sdma_%u", + pdd->dev->id); + kfd_sysfs_create_file(p->kobj, &pdd->attr_sdma, + pdd->sdma_filename); + } +} + +void kfd_procfs_del_queue(struct queue *q) +{ + if (!q) + return; + + kobject_del(&q->kobj); + kobject_put(&q->kobj); +} + +int kfd_process_create_wq(void) +{ + if (!kfd_process_wq) + kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0); + if (!kfd_restore_wq) + kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0); + + if (!kfd_process_wq || !kfd_restore_wq) { + kfd_process_destroy_wq(); + return -ENOMEM; + } + + return 0; +} + +void kfd_process_destroy_wq(void) +{ + if (kfd_process_wq) { + destroy_workqueue(kfd_process_wq); + kfd_process_wq = NULL; + } + if (kfd_restore_wq) { + destroy_workqueue(kfd_restore_wq); + kfd_restore_wq = NULL; + } +} + +static void kfd_process_free_gpuvm(struct kgd_mem *mem, + struct kfd_process_device *pdd, void **kptr) +{ + struct kfd_node *dev = pdd->dev; + + if (kptr && *kptr) { + amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(mem); + *kptr = NULL; + } + + amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(dev->adev, mem, pdd->drm_priv); + amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->adev, mem, pdd->drm_priv, + NULL); +} + +/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process + * This function should be only called right after the process + * is created and when kfd_processes_mutex is still being held + * to avoid concurrency. Because of that exclusiveness, we do + * not need to take p->mutex. + */ +static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd, + uint64_t gpu_va, uint32_t size, + uint32_t flags, struct kgd_mem **mem, void **kptr) +{ + struct kfd_node *kdev = pdd->dev; + int err; + + err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(kdev->adev, gpu_va, size, + pdd->drm_priv, mem, NULL, + flags, false); + if (err) + goto err_alloc_mem; + + err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->adev, *mem, + pdd->drm_priv); + if (err) + goto err_map_mem; + + err = amdgpu_amdkfd_gpuvm_sync_memory(kdev->adev, *mem, true); + if (err) { + pr_debug("Sync memory failed, wait interrupted by user signal\n"); + goto sync_memory_failed; + } + + if (kptr) { + err = amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel( + (struct kgd_mem *)*mem, kptr, NULL); + if (err) { + pr_debug("Map GTT BO to kernel failed\n"); + goto sync_memory_failed; + } + } + + return err; + +sync_memory_failed: + amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(kdev->adev, *mem, pdd->drm_priv); + +err_map_mem: + amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->adev, *mem, pdd->drm_priv, + NULL); +err_alloc_mem: + *mem = NULL; + *kptr = NULL; + return err; +} + +/* kfd_process_device_reserve_ib_mem - Reserve memory inside the + * process for IB usage The memory reserved is for KFD to submit + * IB to AMDGPU from kernel. If the memory is reserved + * successfully, ib_kaddr will have the CPU/kernel + * address. Check ib_kaddr before accessing the memory. + */ +static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd) +{ + struct qcm_process_device *qpd = &pdd->qpd; + uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT | + KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE | + KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE | + KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE; + struct kgd_mem *mem; + void *kaddr; + int ret; + + if (qpd->ib_kaddr || !qpd->ib_base) + return 0; + + /* ib_base is only set for dGPU */ + ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags, + &mem, &kaddr); + if (ret) + return ret; + + qpd->ib_mem = mem; + qpd->ib_kaddr = kaddr; + + return 0; +} + +static void kfd_process_device_destroy_ib_mem(struct kfd_process_device *pdd) +{ + struct qcm_process_device *qpd = &pdd->qpd; + + if (!qpd->ib_kaddr || !qpd->ib_base) + return; + + kfd_process_free_gpuvm(qpd->ib_mem, pdd, &qpd->ib_kaddr); +} + +struct kfd_process *kfd_create_process(struct task_struct *thread) +{ + struct kfd_process *process; + int ret; + + if (!(thread->mm && mmget_not_zero(thread->mm))) + return ERR_PTR(-EINVAL); + + /* Only the pthreads threading model is supported. */ + if (thread->group_leader->mm != thread->mm) { + mmput(thread->mm); + return ERR_PTR(-EINVAL); + } + + /* + * take kfd processes mutex before starting of process creation + * so there won't be a case where two threads of the same process + * create two kfd_process structures + */ + mutex_lock(&kfd_processes_mutex); + + if (kfd_is_locked()) { + mutex_unlock(&kfd_processes_mutex); + pr_debug("KFD is locked! Cannot create process"); + return ERR_PTR(-EINVAL); + } + + /* A prior open of /dev/kfd could have already created the process. */ + process = find_process(thread, false); + if (process) { + pr_debug("Process already found\n"); + } else { + process = create_process(thread); + if (IS_ERR(process)) + goto out; + + if (!procfs.kobj) + goto out; + + process->kobj = kfd_alloc_struct(process->kobj); + if (!process->kobj) { + pr_warn("Creating procfs kobject failed"); + goto out; + } + ret = kobject_init_and_add(process->kobj, &procfs_type, + procfs.kobj, "%d", + (int)process->lead_thread->pid); + if (ret) { + pr_warn("Creating procfs pid directory failed"); + kobject_put(process->kobj); + goto out; + } + + kfd_sysfs_create_file(process->kobj, &process->attr_pasid, + "pasid"); + + process->kobj_queues = kobject_create_and_add("queues", + process->kobj); + if (!process->kobj_queues) + pr_warn("Creating KFD proc/queues folder failed"); + + kfd_procfs_add_sysfs_stats(process); + kfd_procfs_add_sysfs_files(process); + kfd_procfs_add_sysfs_counters(process); + + init_waitqueue_head(&process->wait_irq_drain); + } +out: + if (!IS_ERR(process)) + kref_get(&process->ref); + mutex_unlock(&kfd_processes_mutex); + mmput(thread->mm); + + return process; +} + +struct kfd_process *kfd_get_process(const struct task_struct *thread) +{ + struct kfd_process *process; + + if (!thread->mm) + return ERR_PTR(-EINVAL); + + /* Only the pthreads threading model is supported. */ + if (thread->group_leader->mm != thread->mm) + return ERR_PTR(-EINVAL); + + process = find_process(thread, false); + if (!process) + return ERR_PTR(-EINVAL); + + return process; +} + +static struct kfd_process *find_process_by_mm(const struct mm_struct *mm) +{ + struct kfd_process *process; + + hash_for_each_possible_rcu(kfd_processes_table, process, + kfd_processes, (uintptr_t)mm) + if (process->mm == mm) + return process; + + return NULL; +} + +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; +} + +void kfd_unref_process(struct kfd_process *p) +{ + kref_put(&p->ref, kfd_process_ref_release); +} + +/* 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; +} + +static void kfd_process_device_free_bos(struct kfd_process_device *pdd) +{ + struct kfd_process *p = pdd->process; + void *mem; + int id; + int i; + + /* + * Remove all handles from idr and release appropriate + * local memory object + */ + idr_for_each_entry(&pdd->alloc_idr, mem, id) { + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *peer_pdd = p->pdds[i]; + + if (!peer_pdd->drm_priv) + continue; + amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu( + peer_pdd->dev->adev, mem, peer_pdd->drm_priv); + } + + amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->adev, mem, + pdd->drm_priv, NULL); + kfd_process_device_remove_obj_handle(pdd, id); + } +} + +/* + * Just kunmap and unpin signal BO here. It will be freed in + * kfd_process_free_outstanding_kfd_bos() + */ +static void kfd_process_kunmap_signal_bo(struct kfd_process *p) +{ + struct kfd_process_device *pdd; + struct kfd_node *kdev; + void *mem; + + kdev = kfd_device_by_id(GET_GPU_ID(p->signal_handle)); + if (!kdev) + return; + + mutex_lock(&p->mutex); + + pdd = kfd_get_process_device_data(kdev, p); + if (!pdd) + goto out; + + mem = kfd_process_device_translate_handle( + pdd, GET_IDR_HANDLE(p->signal_handle)); + if (!mem) + goto out; + + amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(mem); + +out: + mutex_unlock(&p->mutex); +} + +static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p) +{ + int i; + + for (i = 0; i < p->n_pdds; i++) + kfd_process_device_free_bos(p->pdds[i]); +} + +static void kfd_process_destroy_pdds(struct kfd_process *p) +{ + int i; + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + pr_debug("Releasing pdd (topology id %d) for process (pasid 0x%x)\n", + pdd->dev->id, p->pasid); + + kfd_process_device_destroy_cwsr_dgpu(pdd); + kfd_process_device_destroy_ib_mem(pdd); + + if (pdd->drm_file) { + amdgpu_amdkfd_gpuvm_release_process_vm( + pdd->dev->adev, pdd->drm_priv); + fput(pdd->drm_file); + } + + if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base) + free_pages((unsigned long)pdd->qpd.cwsr_kaddr, + get_order(KFD_CWSR_TBA_TMA_SIZE)); + + idr_destroy(&pdd->alloc_idr); + + kfd_free_process_doorbells(pdd->dev->kfd, pdd); + + if (pdd->dev->kfd->shared_resources.enable_mes) + amdgpu_amdkfd_free_gtt_mem(pdd->dev->adev, + pdd->proc_ctx_bo); + /* + * before destroying pdd, make sure to report availability + * for auto suspend + */ + if (pdd->runtime_inuse) { + pm_runtime_mark_last_busy(adev_to_drm(pdd->dev->adev)->dev); + pm_runtime_put_autosuspend(adev_to_drm(pdd->dev->adev)->dev); + pdd->runtime_inuse = false; + } + + kfree(pdd); + p->pdds[i] = NULL; + } + p->n_pdds = 0; +} + +static void kfd_process_remove_sysfs(struct kfd_process *p) +{ + struct kfd_process_device *pdd; + int i; + + if (!p->kobj) + return; + + sysfs_remove_file(p->kobj, &p->attr_pasid); + kobject_del(p->kobj_queues); + kobject_put(p->kobj_queues); + p->kobj_queues = NULL; + + for (i = 0; i < p->n_pdds; i++) { + pdd = p->pdds[i]; + + sysfs_remove_file(p->kobj, &pdd->attr_vram); + sysfs_remove_file(p->kobj, &pdd->attr_sdma); + + sysfs_remove_file(pdd->kobj_stats, &pdd->attr_evict); + if (pdd->dev->kfd2kgd->get_cu_occupancy) + sysfs_remove_file(pdd->kobj_stats, + &pdd->attr_cu_occupancy); + kobject_del(pdd->kobj_stats); + kobject_put(pdd->kobj_stats); + pdd->kobj_stats = NULL; + } + + for_each_set_bit(i, p->svms.bitmap_supported, p->n_pdds) { + pdd = p->pdds[i]; + + sysfs_remove_file(pdd->kobj_counters, &pdd->attr_faults); + sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_in); + sysfs_remove_file(pdd->kobj_counters, &pdd->attr_page_out); + kobject_del(pdd->kobj_counters); + kobject_put(pdd->kobj_counters); + pdd->kobj_counters = NULL; + } + + kobject_del(p->kobj); + kobject_put(p->kobj); + p->kobj = NULL; +} + +/* No process locking is needed in this function, because the process + * is not findable any more. We must assume that no other thread is + * using it any more, otherwise we couldn't safely free the process + * structure in the end. + */ +static void kfd_process_wq_release(struct work_struct *work) +{ + struct kfd_process *p = container_of(work, struct kfd_process, + release_work); + + kfd_process_dequeue_from_all_devices(p); + pqm_uninit(&p->pqm); + + /* Signal the eviction fence after user mode queues are + * destroyed. This allows any BOs to be freed without + * triggering pointless evictions or waiting for fences. + */ + dma_fence_signal(p->ef); + + kfd_process_remove_sysfs(p); + + kfd_process_kunmap_signal_bo(p); + kfd_process_free_outstanding_kfd_bos(p); + svm_range_list_fini(p); + + kfd_process_destroy_pdds(p); + dma_fence_put(p->ef); + + kfd_event_free_process(p); + + kfd_pasid_free(p->pasid); + mutex_destroy(&p->mutex); + + put_task_struct(p->lead_thread); + + kfree(p); +} + +static void kfd_process_ref_release(struct kref *ref) +{ + struct kfd_process *p = container_of(ref, struct kfd_process, ref); + + INIT_WORK(&p->release_work, kfd_process_wq_release); + queue_work(kfd_process_wq, &p->release_work); +} + +static struct mmu_notifier *kfd_process_alloc_notifier(struct mm_struct *mm) +{ + int idx = srcu_read_lock(&kfd_processes_srcu); + struct kfd_process *p = find_process_by_mm(mm); + + srcu_read_unlock(&kfd_processes_srcu, idx); + + return p ? &p->mmu_notifier : ERR_PTR(-ESRCH); +} + +static void kfd_process_free_notifier(struct mmu_notifier *mn) +{ + kfd_unref_process(container_of(mn, struct kfd_process, mmu_notifier)); +} + +static void kfd_process_notifier_release_internal(struct kfd_process *p) +{ + int i; + + cancel_delayed_work_sync(&p->eviction_work); + cancel_delayed_work_sync(&p->restore_work); + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + /* re-enable GFX OFF since runtime enable with ttmp setup disabled it. */ + if (!kfd_dbg_is_rlc_restore_supported(pdd->dev) && p->runtime_info.ttmp_setup) + amdgpu_gfx_off_ctrl(pdd->dev->adev, true); + } + + /* Indicate to other users that MM is no longer valid */ + p->mm = NULL; + kfd_dbg_trap_disable(p); + + if (atomic_read(&p->debugged_process_count) > 0) { + struct kfd_process *target; + unsigned int temp; + int idx = srcu_read_lock(&kfd_processes_srcu); + + hash_for_each_rcu(kfd_processes_table, temp, target, kfd_processes) { + if (target->debugger_process && target->debugger_process == p) { + mutex_lock_nested(&target->mutex, 1); + kfd_dbg_trap_disable(target); + mutex_unlock(&target->mutex); + if (atomic_read(&p->debugged_process_count) == 0) + break; + } + } + + srcu_read_unlock(&kfd_processes_srcu, idx); + } + + mmu_notifier_put(&p->mmu_notifier); +} + +static void kfd_process_notifier_release(struct mmu_notifier *mn, + struct mm_struct *mm) +{ + struct kfd_process *p; + + /* + * The kfd_process structure can not be free because the + * mmu_notifier srcu is read locked + */ + p = container_of(mn, struct kfd_process, mmu_notifier); + if (WARN_ON(p->mm != mm)) + return; + + mutex_lock(&kfd_processes_mutex); + /* + * Do early return if table is empty. + * + * This could potentially happen if this function is called concurrently + * by mmu_notifier and by kfd_cleanup_pocesses. + * + */ + if (hash_empty(kfd_processes_table)) { + mutex_unlock(&kfd_processes_mutex); + return; + } + hash_del_rcu(&p->kfd_processes); + mutex_unlock(&kfd_processes_mutex); + synchronize_srcu(&kfd_processes_srcu); + + kfd_process_notifier_release_internal(p); +} + +static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = { + .release = kfd_process_notifier_release, + .alloc_notifier = kfd_process_alloc_notifier, + .free_notifier = kfd_process_free_notifier, +}; + +/* + * This code handles the case when driver is being unloaded before all + * mm_struct are released. We need to safely free the kfd_process and + * avoid race conditions with mmu_notifier that might try to free them. + * + */ +void kfd_cleanup_processes(void) +{ + struct kfd_process *p; + struct hlist_node *p_temp; + unsigned int temp; + HLIST_HEAD(cleanup_list); + + /* + * Move all remaining kfd_process from the process table to a + * temp list for processing. Once done, callback from mmu_notifier + * release will not see the kfd_process in the table and do early return, + * avoiding double free issues. + */ + mutex_lock(&kfd_processes_mutex); + hash_for_each_safe(kfd_processes_table, temp, p_temp, p, kfd_processes) { + hash_del_rcu(&p->kfd_processes); + synchronize_srcu(&kfd_processes_srcu); + hlist_add_head(&p->kfd_processes, &cleanup_list); + } + mutex_unlock(&kfd_processes_mutex); + + hlist_for_each_entry_safe(p, p_temp, &cleanup_list, kfd_processes) + kfd_process_notifier_release_internal(p); + + /* + * Ensures that all outstanding free_notifier get called, triggering + * the release of the kfd_process struct. + */ + mmu_notifier_synchronize(); +} + +int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep) +{ + unsigned long offset; + int i; + + if (p->has_cwsr) + return 0; + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_node *dev = p->pdds[i]->dev; + struct qcm_process_device *qpd = &p->pdds[i]->qpd; + + if (!dev->kfd->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base) + continue; + + offset = KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id); + qpd->tba_addr = (int64_t)vm_mmap(filep, 0, + KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC, + MAP_SHARED, offset); + + if (IS_ERR_VALUE(qpd->tba_addr)) { + int err = qpd->tba_addr; + + pr_err("Failure to set tba address. error %d.\n", err); + qpd->tba_addr = 0; + qpd->cwsr_kaddr = NULL; + return err; + } + + memcpy(qpd->cwsr_kaddr, dev->kfd->cwsr_isa, dev->kfd->cwsr_isa_size); + + kfd_process_set_trap_debug_flag(qpd, p->debug_trap_enabled); + + qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET; + pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n", + qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr); + } + + p->has_cwsr = true; + + return 0; +} + +static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd) +{ + struct kfd_node *dev = pdd->dev; + struct qcm_process_device *qpd = &pdd->qpd; + uint32_t flags = KFD_IOC_ALLOC_MEM_FLAGS_GTT + | KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE + | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE; + struct kgd_mem *mem; + void *kaddr; + int ret; + + if (!dev->kfd->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base) + return 0; + + /* cwsr_base is only set for dGPU */ + ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base, + KFD_CWSR_TBA_TMA_SIZE, flags, &mem, &kaddr); + if (ret) + return ret; + + qpd->cwsr_mem = mem; + qpd->cwsr_kaddr = kaddr; + qpd->tba_addr = qpd->cwsr_base; + + memcpy(qpd->cwsr_kaddr, dev->kfd->cwsr_isa, dev->kfd->cwsr_isa_size); + + kfd_process_set_trap_debug_flag(&pdd->qpd, + pdd->process->debug_trap_enabled); + + qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET; + pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n", + qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr); + + return 0; +} + +static void kfd_process_device_destroy_cwsr_dgpu(struct kfd_process_device *pdd) +{ + struct kfd_node *dev = pdd->dev; + struct qcm_process_device *qpd = &pdd->qpd; + + if (!dev->kfd->cwsr_enabled || !qpd->cwsr_kaddr || !qpd->cwsr_base) + return; + + kfd_process_free_gpuvm(qpd->cwsr_mem, pdd, &qpd->cwsr_kaddr); +} + +void kfd_process_set_trap_handler(struct qcm_process_device *qpd, + uint64_t tba_addr, + uint64_t tma_addr) +{ + if (qpd->cwsr_kaddr) { + /* KFD trap handler is bound, record as second-level TBA/TMA + * in first-level TMA. First-level trap will jump to second. + */ + uint64_t *tma = + (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET); + tma[0] = tba_addr; + tma[1] = tma_addr; + } else { + /* No trap handler bound, bind as first-level TBA/TMA. */ + qpd->tba_addr = tba_addr; + qpd->tma_addr = tma_addr; + } +} + +bool kfd_process_xnack_mode(struct kfd_process *p, bool supported) +{ + int i; + + /* On most GFXv9 GPUs, the retry mode in the SQ must match the + * boot time retry setting. Mixing processes with different + * XNACK/retry settings can hang the GPU. + * + * Different GPUs can have different noretry settings depending + * on HW bugs or limitations. We need to find at least one + * XNACK mode for this process that's compatible with all GPUs. + * Fortunately GPUs with retry enabled (noretry=0) can run code + * built for XNACK-off. On GFXv9 it may perform slower. + * + * Therefore applications built for XNACK-off can always be + * supported and will be our fallback if any GPU does not + * support retry. + */ + for (i = 0; i < p->n_pdds; i++) { + struct kfd_node *dev = p->pdds[i]->dev; + + /* Only consider GFXv9 and higher GPUs. Older GPUs don't + * support the SVM APIs and don't need to be considered + * for the XNACK mode selection. + */ + if (!KFD_IS_SOC15(dev)) + continue; + /* Aldebaran can always support XNACK because it can support + * per-process XNACK mode selection. But let the dev->noretry + * setting still influence the default XNACK mode. + */ + if (supported && KFD_SUPPORT_XNACK_PER_PROCESS(dev)) + continue; + + /* GFXv10 and later GPUs do not support shader preemption + * during page faults. This can lead to poor QoS for queue + * management and memory-manager-related preemptions or + * even deadlocks. + */ + if (KFD_GC_VERSION(dev) >= IP_VERSION(10, 1, 1)) + return false; + + if (dev->kfd->noretry) + return false; + } + + return true; +} + +void kfd_process_set_trap_debug_flag(struct qcm_process_device *qpd, + bool enabled) +{ + if (qpd->cwsr_kaddr) { + uint64_t *tma = + (uint64_t *)(qpd->cwsr_kaddr + KFD_CWSR_TMA_OFFSET); + tma[2] = enabled; + } +} + +/* + * On return the kfd_process is fully operational and will be freed when the + * mm is released + */ +static struct kfd_process *create_process(const struct task_struct *thread) +{ + struct kfd_process *process; + struct mmu_notifier *mn; + int err = -ENOMEM; + + process = kzalloc(sizeof(*process), GFP_KERNEL); + if (!process) + goto err_alloc_process; + + kref_init(&process->ref); + mutex_init(&process->mutex); + process->mm = thread->mm; + process->lead_thread = thread->group_leader; + process->n_pdds = 0; + process->queues_paused = false; + INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker); + INIT_DELAYED_WORK(&process->restore_work, restore_process_worker); + process->last_restore_timestamp = get_jiffies_64(); + err = kfd_event_init_process(process); + if (err) + goto err_event_init; + process->is_32bit_user_mode = in_compat_syscall(); + process->debug_trap_enabled = false; + process->debugger_process = NULL; + process->exception_enable_mask = 0; + atomic_set(&process->debugged_process_count, 0); + sema_init(&process->runtime_enable_sema, 0); + + process->pasid = kfd_pasid_alloc(); + if (process->pasid == 0) { + err = -ENOSPC; + goto err_alloc_pasid; + } + + err = pqm_init(&process->pqm, process); + if (err != 0) + goto err_process_pqm_init; + + /* init process apertures*/ + err = kfd_init_apertures(process); + if (err != 0) + goto err_init_apertures; + + /* Check XNACK support after PDDs are created in kfd_init_apertures */ + process->xnack_enabled = kfd_process_xnack_mode(process, false); + + err = svm_range_list_init(process); + if (err) + goto err_init_svm_range_list; + + /* alloc_notifier needs to find the process in the hash table */ + hash_add_rcu(kfd_processes_table, &process->kfd_processes, + (uintptr_t)process->mm); + + /* Avoid free_notifier to start kfd_process_wq_release if + * mmu_notifier_get failed because of pending signal. + */ + kref_get(&process->ref); + + /* MMU notifier registration must be the last call that can fail + * because after this point we cannot unwind the process creation. + * After this point, mmu_notifier_put will trigger the cleanup by + * dropping the last process reference in the free_notifier. + */ + mn = mmu_notifier_get(&kfd_process_mmu_notifier_ops, process->mm); + if (IS_ERR(mn)) { + err = PTR_ERR(mn); + goto err_register_notifier; + } + BUG_ON(mn != &process->mmu_notifier); + + kfd_unref_process(process); + get_task_struct(process->lead_thread); + + INIT_WORK(&process->debug_event_workarea, debug_event_write_work_handler); + + return process; + +err_register_notifier: + hash_del_rcu(&process->kfd_processes); + svm_range_list_fini(process); +err_init_svm_range_list: + kfd_process_free_outstanding_kfd_bos(process); + kfd_process_destroy_pdds(process); +err_init_apertures: + pqm_uninit(&process->pqm); +err_process_pqm_init: + kfd_pasid_free(process->pasid); +err_alloc_pasid: + kfd_event_free_process(process); +err_event_init: + mutex_destroy(&process->mutex); + kfree(process); +err_alloc_process: + return ERR_PTR(err); +} + +struct kfd_process_device *kfd_get_process_device_data(struct kfd_node *dev, + struct kfd_process *p) +{ + int i; + + for (i = 0; i < p->n_pdds; i++) + if (p->pdds[i]->dev == dev) + return p->pdds[i]; + + return NULL; +} + +struct kfd_process_device *kfd_create_process_device_data(struct kfd_node *dev, + struct kfd_process *p) +{ + struct kfd_process_device *pdd = NULL; + int retval = 0; + + if (WARN_ON_ONCE(p->n_pdds >= MAX_GPU_INSTANCE)) + return NULL; + pdd = kzalloc(sizeof(*pdd), GFP_KERNEL); + if (!pdd) + return NULL; + + pdd->dev = dev; + INIT_LIST_HEAD(&pdd->qpd.queues_list); + INIT_LIST_HEAD(&pdd->qpd.priv_queue_list); + pdd->qpd.dqm = dev->dqm; + pdd->qpd.pqm = &p->pqm; + pdd->qpd.evicted = 0; + pdd->qpd.mapped_gws_queue = false; + pdd->process = p; + pdd->bound = PDD_UNBOUND; + pdd->already_dequeued = false; + pdd->runtime_inuse = false; + pdd->vram_usage = 0; + pdd->sdma_past_activity_counter = 0; + pdd->user_gpu_id = dev->id; + atomic64_set(&pdd->evict_duration_counter, 0); + + if (dev->kfd->shared_resources.enable_mes) { + retval = amdgpu_amdkfd_alloc_gtt_mem(dev->adev, + AMDGPU_MES_PROC_CTX_SIZE, + &pdd->proc_ctx_bo, + &pdd->proc_ctx_gpu_addr, + &pdd->proc_ctx_cpu_ptr, + false); + if (retval) { + pr_err("failed to allocate process context bo\n"); + goto err_free_pdd; + } + memset(pdd->proc_ctx_cpu_ptr, 0, AMDGPU_MES_PROC_CTX_SIZE); + } + + p->pdds[p->n_pdds++] = pdd; + if (kfd_dbg_is_per_vmid_supported(pdd->dev)) + pdd->spi_dbg_override = pdd->dev->kfd2kgd->disable_debug_trap( + pdd->dev->adev, + false, + 0); + + /* Init idr used for memory handle translation */ + idr_init(&pdd->alloc_idr); + + return pdd; + +err_free_pdd: + kfree(pdd); + return NULL; +} + +/** + * kfd_process_device_init_vm - Initialize a VM for a process-device + * + * @pdd: The process-device + * @drm_file: Optional pointer to a DRM file descriptor + * + * If @drm_file is specified, it will be used to acquire the VM from + * that file descriptor. If successful, the @pdd takes ownership of + * the file descriptor. + * + * If @drm_file is NULL, a new VM is created. + * + * Returns 0 on success, -errno on failure. + */ +int kfd_process_device_init_vm(struct kfd_process_device *pdd, + struct file *drm_file) +{ + struct amdgpu_fpriv *drv_priv; + struct amdgpu_vm *avm; + struct kfd_process *p; + struct kfd_node *dev; + int ret; + + if (!drm_file) + return -EINVAL; + + if (pdd->drm_priv) + return -EBUSY; + + ret = amdgpu_file_to_fpriv(drm_file, &drv_priv); + if (ret) + return ret; + avm = &drv_priv->vm; + + p = pdd->process; + dev = pdd->dev; + + ret = amdgpu_amdkfd_gpuvm_acquire_process_vm(dev->adev, avm, + &p->kgd_process_info, + &p->ef); + if (ret) { + pr_err("Failed to create process VM object\n"); + return ret; + } + pdd->drm_priv = drm_file->private_data; + atomic64_set(&pdd->tlb_seq, 0); + + ret = kfd_process_device_reserve_ib_mem(pdd); + if (ret) + goto err_reserve_ib_mem; + ret = kfd_process_device_init_cwsr_dgpu(pdd); + if (ret) + goto err_init_cwsr; + + ret = amdgpu_amdkfd_gpuvm_set_vm_pasid(dev->adev, avm, p->pasid); + if (ret) + goto err_set_pasid; + + pdd->drm_file = drm_file; + + return 0; + +err_set_pasid: + kfd_process_device_destroy_cwsr_dgpu(pdd); +err_init_cwsr: + kfd_process_device_destroy_ib_mem(pdd); +err_reserve_ib_mem: + pdd->drm_priv = NULL; + amdgpu_amdkfd_gpuvm_destroy_cb(dev->adev, avm); + + return ret; +} + +/* + * Direct the IOMMU to bind the process (specifically the pasid->mm) + * to the device. + * Unbinding occurs when the process dies or the device is removed. + * + * Assumes that the process lock is held. + */ +struct kfd_process_device *kfd_bind_process_to_device(struct kfd_node *dev, + struct kfd_process *p) +{ + struct kfd_process_device *pdd; + int err; + + pdd = kfd_get_process_device_data(dev, p); + if (!pdd) { + pr_err("Process device data doesn't exist\n"); + return ERR_PTR(-ENOMEM); + } + + if (!pdd->drm_priv) + return ERR_PTR(-ENODEV); + + /* + * signal runtime-pm system to auto resume and prevent + * further runtime suspend once device pdd is created until + * pdd is destroyed. + */ + if (!pdd->runtime_inuse) { + err = pm_runtime_get_sync(adev_to_drm(dev->adev)->dev); + if (err < 0) { + pm_runtime_put_autosuspend(adev_to_drm(dev->adev)->dev); + return ERR_PTR(err); + } + } + + /* + * make sure that runtime_usage counter is incremented just once + * per pdd + */ + pdd->runtime_inuse = true; + + return pdd; +} + +/* Create specific handle mapped to mem from process local memory idr + * Assumes that the process lock is held. + */ +int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd, + void *mem) +{ + return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL); +} + +/* Translate specific handle from process local memory idr + * Assumes that the process lock is held. + */ +void *kfd_process_device_translate_handle(struct kfd_process_device *pdd, + int handle) +{ + if (handle < 0) + return NULL; + + return idr_find(&pdd->alloc_idr, handle); +} + +/* Remove specific handle from process local memory idr + * Assumes that the process lock is held. + */ +void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd, + int handle) +{ + if (handle >= 0) + idr_remove(&pdd->alloc_idr, handle); +} + +/* This increments the process->ref counter. */ +struct kfd_process *kfd_lookup_process_by_pasid(u32 pasid) +{ + struct kfd_process *p, *ret_p = NULL; + unsigned int temp; + + int idx = srcu_read_lock(&kfd_processes_srcu); + + hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { + if (p->pasid == pasid) { + kref_get(&p->ref); + ret_p = p; + break; + } + } + + srcu_read_unlock(&kfd_processes_srcu, idx); + + return ret_p; +} + +/* This increments the process->ref counter. */ +struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm) +{ + struct kfd_process *p; + + int idx = srcu_read_lock(&kfd_processes_srcu); + + p = find_process_by_mm(mm); + if (p) + kref_get(&p->ref); + + srcu_read_unlock(&kfd_processes_srcu, idx); + + return p; +} + +/* kfd_process_evict_queues - Evict all user queues of a process + * + * Eviction is reference-counted per process-device. This means multiple + * evictions from different sources can be nested safely. + */ +int kfd_process_evict_queues(struct kfd_process *p, uint32_t trigger) +{ + int r = 0; + int i; + unsigned int n_evicted = 0; + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + kfd_smi_event_queue_eviction(pdd->dev, p->lead_thread->pid, + trigger); + + r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm, + &pdd->qpd); + /* evict return -EIO if HWS is hang or asic is resetting, in this case + * we would like to set all the queues to be in evicted state to prevent + * them been add back since they actually not be saved right now. + */ + if (r && r != -EIO) { + pr_err("Failed to evict process queues\n"); + goto fail; + } + n_evicted++; + } + + return r; + +fail: + /* To keep state consistent, roll back partial eviction by + * restoring queues + */ + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + if (n_evicted == 0) + break; + + kfd_smi_event_queue_restore(pdd->dev, p->lead_thread->pid); + + if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm, + &pdd->qpd)) + pr_err("Failed to restore queues\n"); + + n_evicted--; + } + + return r; +} + +/* kfd_process_restore_queues - Restore all user queues of a process */ +int kfd_process_restore_queues(struct kfd_process *p) +{ + int r, ret = 0; + int i; + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + kfd_smi_event_queue_restore(pdd->dev, p->lead_thread->pid); + + r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm, + &pdd->qpd); + if (r) { + pr_err("Failed to restore process queues\n"); + if (!ret) + ret = r; + } + } + + return ret; +} + +int kfd_process_gpuidx_from_gpuid(struct kfd_process *p, uint32_t gpu_id) +{ + int i; + + for (i = 0; i < p->n_pdds; i++) + if (p->pdds[i] && gpu_id == p->pdds[i]->user_gpu_id) + return i; + return -EINVAL; +} + +int +kfd_process_gpuid_from_node(struct kfd_process *p, struct kfd_node *node, + uint32_t *gpuid, uint32_t *gpuidx) +{ + int i; + + for (i = 0; i < p->n_pdds; i++) + if (p->pdds[i] && p->pdds[i]->dev == node) { + *gpuid = p->pdds[i]->user_gpu_id; + *gpuidx = i; + return 0; + } + return -EINVAL; +} + +static void evict_process_worker(struct work_struct *work) +{ + int ret; + struct kfd_process *p; + struct delayed_work *dwork; + + dwork = to_delayed_work(work); + + /* Process termination destroys this worker thread. So during the + * lifetime of this thread, kfd_process p will be valid + */ + p = container_of(dwork, struct kfd_process, eviction_work); + WARN_ONCE(p->last_eviction_seqno != p->ef->seqno, + "Eviction fence mismatch\n"); + + /* Narrow window of overlap between restore and evict work + * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos + * unreserves KFD BOs, it is possible to evicted again. But + * restore has few more steps of finish. So lets wait for any + * previous restore work to complete + */ + flush_delayed_work(&p->restore_work); + + pr_debug("Started evicting pasid 0x%x\n", p->pasid); + ret = kfd_process_evict_queues(p, KFD_QUEUE_EVICTION_TRIGGER_TTM); + if (!ret) { + dma_fence_signal(p->ef); + dma_fence_put(p->ef); + p->ef = NULL; + queue_delayed_work(kfd_restore_wq, &p->restore_work, + msecs_to_jiffies(PROCESS_RESTORE_TIME_MS)); + + pr_debug("Finished evicting pasid 0x%x\n", p->pasid); + } else + pr_err("Failed to evict queues of pasid 0x%x\n", p->pasid); +} + +static void restore_process_worker(struct work_struct *work) +{ + struct delayed_work *dwork; + struct kfd_process *p; + int ret = 0; + + dwork = to_delayed_work(work); + + /* Process termination destroys this worker thread. So during the + * lifetime of this thread, kfd_process p will be valid + */ + p = container_of(dwork, struct kfd_process, restore_work); + pr_debug("Started restoring pasid 0x%x\n", p->pasid); + + /* Setting last_restore_timestamp before successful restoration. + * Otherwise this would have to be set by KGD (restore_process_bos) + * before KFD BOs are unreserved. If not, the process can be evicted + * again before the timestamp is set. + * If restore fails, the timestamp will be set again in the next + * attempt. This would mean that the minimum GPU quanta would be + * PROCESS_ACTIVE_TIME_MS - (time to execute the following two + * functions) + */ + + p->last_restore_timestamp = get_jiffies_64(); + /* VMs may not have been acquired yet during debugging. */ + if (p->kgd_process_info) + ret = amdgpu_amdkfd_gpuvm_restore_process_bos(p->kgd_process_info, + &p->ef); + if (ret) { + pr_debug("Failed to restore BOs of pasid 0x%x, retry after %d ms\n", + p->pasid, PROCESS_BACK_OFF_TIME_MS); + ret = queue_delayed_work(kfd_restore_wq, &p->restore_work, + msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS)); + WARN(!ret, "reschedule restore work failed\n"); + return; + } + + ret = kfd_process_restore_queues(p); + if (!ret) + pr_debug("Finished restoring pasid 0x%x\n", p->pasid); + else + pr_err("Failed to restore queues of pasid 0x%x\n", p->pasid); +} + +void kfd_suspend_all_processes(void) +{ + struct kfd_process *p; + unsigned int temp; + int idx = srcu_read_lock(&kfd_processes_srcu); + + WARN(debug_evictions, "Evicting all processes"); + hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { + cancel_delayed_work_sync(&p->eviction_work); + flush_delayed_work(&p->restore_work); + + if (kfd_process_evict_queues(p, KFD_QUEUE_EVICTION_TRIGGER_SUSPEND)) + pr_err("Failed to suspend process 0x%x\n", p->pasid); + dma_fence_signal(p->ef); + dma_fence_put(p->ef); + p->ef = NULL; + } + srcu_read_unlock(&kfd_processes_srcu, idx); +} + +int kfd_resume_all_processes(void) +{ + struct kfd_process *p; + unsigned int temp; + int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu); + + hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { + if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) { + pr_err("Restore process %d failed during resume\n", + p->pasid); + ret = -EFAULT; + } + } + srcu_read_unlock(&kfd_processes_srcu, idx); + return ret; +} + +int kfd_reserved_mem_mmap(struct kfd_node *dev, struct kfd_process *process, + struct vm_area_struct *vma) +{ + struct kfd_process_device *pdd; + struct qcm_process_device *qpd; + + if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) { + pr_err("Incorrect CWSR mapping size.\n"); + return -EINVAL; + } + + pdd = kfd_get_process_device_data(dev, process); + if (!pdd) + return -EINVAL; + qpd = &pdd->qpd; + + qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(KFD_CWSR_TBA_TMA_SIZE)); + if (!qpd->cwsr_kaddr) { + pr_err("Error allocating per process CWSR buffer.\n"); + return -ENOMEM; + } + + vm_flags_set(vma, VM_IO | VM_DONTCOPY | VM_DONTEXPAND + | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP); + /* Mapping pages to user process */ + return remap_pfn_range(vma, vma->vm_start, + PFN_DOWN(__pa(qpd->cwsr_kaddr)), + KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot); +} + +void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type) +{ + struct amdgpu_vm *vm = drm_priv_to_vm(pdd->drm_priv); + uint64_t tlb_seq = amdgpu_vm_tlb_seq(vm); + struct kfd_node *dev = pdd->dev; + uint32_t xcc_mask = dev->xcc_mask; + int xcc = 0; + + /* + * It can be that we race and lose here, but that is extremely unlikely + * and the worst thing which could happen is that we flush the changes + * into the TLB once more which is harmless. + */ + if (atomic64_xchg(&pdd->tlb_seq, tlb_seq) == tlb_seq) + return; + + if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) { + /* Nothing to flush until a VMID is assigned, which + * only happens when the first queue is created. + */ + if (pdd->qpd.vmid) + amdgpu_amdkfd_flush_gpu_tlb_vmid(dev->adev, + pdd->qpd.vmid); + } else { + for_each_inst(xcc, xcc_mask) + amdgpu_amdkfd_flush_gpu_tlb_pasid( + dev->adev, pdd->process->pasid, type, xcc); + } +} + +/* assumes caller holds process lock. */ +int kfd_process_drain_interrupts(struct kfd_process_device *pdd) +{ + uint32_t irq_drain_fence[8]; + uint8_t node_id = 0; + int r = 0; + + if (!KFD_IS_SOC15(pdd->dev)) + return 0; + + pdd->process->irq_drain_is_open = true; + + memset(irq_drain_fence, 0, sizeof(irq_drain_fence)); + irq_drain_fence[0] = (KFD_IRQ_FENCE_SOURCEID << 8) | + KFD_IRQ_FENCE_CLIENTID; + irq_drain_fence[3] = pdd->process->pasid; + + /* + * For GFX 9.4.3, send the NodeId also in IH cookie DW[3] + */ + if (KFD_GC_VERSION(pdd->dev->kfd) == IP_VERSION(9, 4, 3)) { + node_id = ffs(pdd->dev->interrupt_bitmap) - 1; + irq_drain_fence[3] |= node_id << 16; + } + + /* ensure stale irqs scheduled KFD interrupts and send drain fence. */ + if (amdgpu_amdkfd_send_close_event_drain_irq(pdd->dev->adev, + irq_drain_fence)) { + pdd->process->irq_drain_is_open = false; + return 0; + } + + r = wait_event_interruptible(pdd->process->wait_irq_drain, + !READ_ONCE(pdd->process->irq_drain_is_open)); + if (r) + pdd->process->irq_drain_is_open = false; + + return r; +} + +void kfd_process_close_interrupt_drain(unsigned int pasid) +{ + struct kfd_process *p; + + p = kfd_lookup_process_by_pasid(pasid); + + if (!p) + return; + + WRITE_ONCE(p->irq_drain_is_open, false); + wake_up_all(&p->wait_irq_drain); + kfd_unref_process(p); +} + +struct send_exception_work_handler_workarea { + struct work_struct work; + struct kfd_process *p; + unsigned int queue_id; + uint64_t error_reason; +}; + +static void send_exception_work_handler(struct work_struct *work) +{ + struct send_exception_work_handler_workarea *workarea; + struct kfd_process *p; + struct queue *q; + struct mm_struct *mm; + struct kfd_context_save_area_header __user *csa_header; + uint64_t __user *err_payload_ptr; + uint64_t cur_err; + uint32_t ev_id; + + workarea = container_of(work, + struct send_exception_work_handler_workarea, + work); + p = workarea->p; + + mm = get_task_mm(p->lead_thread); + + if (!mm) + return; + + kthread_use_mm(mm); + + q = pqm_get_user_queue(&p->pqm, workarea->queue_id); + + if (!q) + goto out; + + csa_header = (void __user *)q->properties.ctx_save_restore_area_address; + + get_user(err_payload_ptr, (uint64_t __user **)&csa_header->err_payload_addr); + get_user(cur_err, err_payload_ptr); + cur_err |= workarea->error_reason; + put_user(cur_err, err_payload_ptr); + get_user(ev_id, &csa_header->err_event_id); + + kfd_set_event(p, ev_id); + +out: + kthread_unuse_mm(mm); + mmput(mm); +} + +int kfd_send_exception_to_runtime(struct kfd_process *p, + unsigned int queue_id, + uint64_t error_reason) +{ + struct send_exception_work_handler_workarea worker; + + INIT_WORK_ONSTACK(&worker.work, send_exception_work_handler); + + worker.p = p; + worker.queue_id = queue_id; + worker.error_reason = error_reason; + + schedule_work(&worker.work); + flush_work(&worker.work); + destroy_work_on_stack(&worker.work); + + return 0; +} + +struct kfd_process_device *kfd_process_device_data_by_id(struct kfd_process *p, uint32_t gpu_id) +{ + int i; + + if (gpu_id) { + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + if (pdd->user_gpu_id == gpu_id) + return pdd; + } + } + return NULL; +} + +int kfd_process_get_user_gpu_id(struct kfd_process *p, uint32_t actual_gpu_id) +{ + int i; + + if (!actual_gpu_id) + return 0; + + for (i = 0; i < p->n_pdds; i++) { + struct kfd_process_device *pdd = p->pdds[i]; + + if (pdd->dev->id == actual_gpu_id) + return pdd->user_gpu_id; + } + return -EINVAL; +} + +#if defined(CONFIG_DEBUG_FS) + +int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data) +{ + struct kfd_process *p; + unsigned int temp; + int r = 0; + + int idx = srcu_read_lock(&kfd_processes_srcu); + + hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { + seq_printf(m, "Process %d PASID 0x%x:\n", + p->lead_thread->tgid, p->pasid); + + mutex_lock(&p->mutex); + r = pqm_debugfs_mqds(m, &p->pqm); + mutex_unlock(&p->mutex); + + if (r) + break; + } + + srcu_read_unlock(&kfd_processes_srcu, idx); + + return r; +} + +#endif |