drm/amdkfd: Add ioctls for GPUVM memory management
v2:
* Fix error handling after kfd_bind_process_to_device in
kfd_ioctl_map_memory_to_gpu
v3:
* Add ioctl to acquire VM from a DRM FD
v4:
* Return number of successful map/unmap operations in failure cases
* Facilitate partial retry after failed map/unmap
* Added comments with parameter descriptions to new APIs
* Defined AMDKFD_IOC_FREE_MEMORY_OF_GPU write-only
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 7d40094..a563ff2 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -24,6 +24,7 @@
#include <linux/export.h>
#include <linux/err.h>
#include <linux/fs.h>
+#include <linux/file.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
@@ -1046,6 +1047,366 @@ static int kfd_ioctl_get_tile_config(struct file *filep,
return 0;
}
+static int kfd_ioctl_acquire_vm(struct file *filep, struct kfd_process *p,
+ void *data)
+{
+ struct kfd_ioctl_acquire_vm_args *args = data;
+ struct kfd_process_device *pdd;
+ struct kfd_dev *dev;
+ struct file *drm_file;
+ int ret;
+
+ dev = kfd_device_by_id(args->gpu_id);
+ if (!dev)
+ return -EINVAL;
+
+ drm_file = fget(args->drm_fd);
+ if (!drm_file)
+ return -EINVAL;
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_get_process_device_data(dev, p);
+ if (!pdd) {
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ if (pdd->drm_file) {
+ ret = pdd->drm_file == drm_file ? 0 : -EBUSY;
+ goto err_unlock;
+ }
+
+ ret = kfd_process_device_init_vm(pdd, drm_file);
+ if (ret)
+ goto err_unlock;
+ /* On success, the PDD keeps the drm_file reference */
+ mutex_unlock(&p->mutex);
+
+ return 0;
+
+err_unlock:
+ mutex_unlock(&p->mutex);
+ fput(drm_file);
+ return ret;
+}
+
+bool kfd_dev_is_large_bar(struct kfd_dev *dev)
+{
+ struct kfd_local_mem_info mem_info;
+
+ if (dev->device_info->needs_iommu_device)
+ return false;
+
+ dev->kfd2kgd->get_local_mem_info(dev->kgd, &mem_info);
+ if (mem_info.local_mem_size_private == 0 &&
+ mem_info.local_mem_size_public > 0)
+ return true;
+ return false;
+}
+
+static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
+ struct kfd_process *p, void *data)
+{
+ struct kfd_ioctl_alloc_memory_of_gpu_args *args = data;
+ struct kfd_process_device *pdd;
+ void *mem;
+ struct kfd_dev *dev;
+ int idr_handle;
+ long err;
+ uint64_t offset = args->mmap_offset;
+ uint32_t flags = args->flags;
+
+ if (args->size == 0)
+ return -EINVAL;
+
+ dev = kfd_device_by_id(args->gpu_id);
+ if (!dev)
+ return -EINVAL;
+
+ if ((flags & KFD_IOC_ALLOC_MEM_FLAGS_PUBLIC) &&
+ (flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) &&
+ !kfd_dev_is_large_bar(dev)) {
+ pr_err("Alloc host visible vram on small bar is not allowed\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_bind_process_to_device(dev, p);
+ if (IS_ERR(pdd)) {
+ err = PTR_ERR(pdd);
+ goto err_unlock;
+ }
+
+ err = dev->kfd2kgd->alloc_memory_of_gpu(
+ dev->kgd, args->va_addr, args->size,
+ pdd->vm, (struct kgd_mem **) &mem, &offset,
+ flags);
+
+ if (err)
+ goto err_unlock;
+
+ idr_handle = kfd_process_device_create_obj_handle(pdd, mem);
+ if (idr_handle < 0) {
+ err = -EFAULT;
+ goto err_free;
+ }
+
+ mutex_unlock(&p->mutex);
+
+ args->handle = MAKE_HANDLE(args->gpu_id, idr_handle);
+ args->mmap_offset = offset;
+
+ return 0;
+
+err_free:
+ dev->kfd2kgd->free_memory_of_gpu(dev->kgd, (struct kgd_mem *)mem);
+err_unlock:
+ mutex_unlock(&p->mutex);
+ return err;
+}
+
+static int kfd_ioctl_free_memory_of_gpu(struct file *filep,
+ struct kfd_process *p, void *data)
+{
+ struct kfd_ioctl_free_memory_of_gpu_args *args = data;
+ struct kfd_process_device *pdd;
+ void *mem;
+ struct kfd_dev *dev;
+ int ret;
+
+ dev = kfd_device_by_id(GET_GPU_ID(args->handle));
+ if (!dev)
+ return -EINVAL;
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_get_process_device_data(dev, p);
+ if (!pdd) {
+ pr_err("Process device data doesn't exist\n");
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ mem = kfd_process_device_translate_handle(
+ pdd, GET_IDR_HANDLE(args->handle));
+ if (!mem) {
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
+ ret = dev->kfd2kgd->free_memory_of_gpu(dev->kgd, (struct kgd_mem *)mem);
+
+ /* If freeing the buffer failed, leave the handle in place for
+ * clean-up during process tear-down.
+ */
+ if (!ret)
+ kfd_process_device_remove_obj_handle(
+ pdd, GET_IDR_HANDLE(args->handle));
+
+err_unlock:
+ mutex_unlock(&p->mutex);
+ return ret;
+}
+
+static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
+ struct kfd_process *p, void *data)
+{
+ struct kfd_ioctl_map_memory_to_gpu_args *args = data;
+ struct kfd_process_device *pdd, *peer_pdd;
+ void *mem;
+ struct kfd_dev *dev, *peer;
+ long err = 0;
+ int i;
+ uint32_t *devices_arr = NULL;
+
+ dev = kfd_device_by_id(GET_GPU_ID(args->handle));
+ if (!dev)
+ return -EINVAL;
+
+ if (!args->n_devices) {
+ pr_debug("Device IDs array empty\n");
+ return -EINVAL;
+ }
+ if (args->n_success > args->n_devices) {
+ pr_debug("n_success exceeds n_devices\n");
+ return -EINVAL;
+ }
+
+ devices_arr = kmalloc(args->n_devices * sizeof(*devices_arr),
+ GFP_KERNEL);
+ if (!devices_arr)
+ return -ENOMEM;
+
+ err = copy_from_user(devices_arr,
+ (void __user *)args->device_ids_array_ptr,
+ args->n_devices * sizeof(*devices_arr));
+ if (err != 0) {
+ err = -EFAULT;
+ goto copy_from_user_failed;
+ }
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_bind_process_to_device(dev, p);
+ if (IS_ERR(pdd)) {
+ err = PTR_ERR(pdd);
+ goto bind_process_to_device_failed;
+ }
+
+ mem = kfd_process_device_translate_handle(pdd,
+ GET_IDR_HANDLE(args->handle));
+ if (!mem) {
+ err = -ENOMEM;
+ goto get_mem_obj_from_handle_failed;
+ }
+
+ for (i = args->n_success; i < args->n_devices; i++) {
+ peer = kfd_device_by_id(devices_arr[i]);
+ if (!peer) {
+ pr_debug("Getting device by id failed for 0x%x\n",
+ devices_arr[i]);
+ err = -EINVAL;
+ goto get_mem_obj_from_handle_failed;
+ }
+
+ peer_pdd = kfd_bind_process_to_device(peer, p);
+ if (IS_ERR(peer_pdd)) {
+ err = PTR_ERR(peer_pdd);
+ goto get_mem_obj_from_handle_failed;
+ }
+ err = peer->kfd2kgd->map_memory_to_gpu(
+ peer->kgd, (struct kgd_mem *)mem, peer_pdd->vm);
+ if (err) {
+ pr_err("Failed to map to gpu %d/%d\n",
+ i, args->n_devices);
+ goto map_memory_to_gpu_failed;
+ }
+ args->n_success = i+1;
+ }
+
+ mutex_unlock(&p->mutex);
+
+ err = dev->kfd2kgd->sync_memory(dev->kgd, (struct kgd_mem *) mem, true);
+ if (err) {
+ pr_debug("Sync memory failed, wait interrupted by user signal\n");
+ goto sync_memory_failed;
+ }
+
+ /* Flush TLBs after waiting for the page table updates to complete */
+ for (i = 0; i < args->n_devices; i++) {
+ peer = kfd_device_by_id(devices_arr[i]);
+ if (WARN_ON_ONCE(!peer))
+ continue;
+ peer_pdd = kfd_get_process_device_data(peer, p);
+ if (WARN_ON_ONCE(!peer_pdd))
+ continue;
+ kfd_flush_tlb(peer_pdd);
+ }
+
+ kfree(devices_arr);
+
+ return err;
+
+bind_process_to_device_failed:
+get_mem_obj_from_handle_failed:
+map_memory_to_gpu_failed:
+ mutex_unlock(&p->mutex);
+copy_from_user_failed:
+sync_memory_failed:
+ kfree(devices_arr);
+
+ return err;
+}
+
+static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
+ struct kfd_process *p, void *data)
+{
+ struct kfd_ioctl_unmap_memory_from_gpu_args *args = data;
+ struct kfd_process_device *pdd, *peer_pdd;
+ void *mem;
+ struct kfd_dev *dev, *peer;
+ long err = 0;
+ uint32_t *devices_arr = NULL, i;
+
+ dev = kfd_device_by_id(GET_GPU_ID(args->handle));
+ if (!dev)
+ return -EINVAL;
+
+ if (!args->n_devices) {
+ pr_debug("Device IDs array empty\n");
+ return -EINVAL;
+ }
+ if (args->n_success > args->n_devices) {
+ pr_debug("n_success exceeds n_devices\n");
+ return -EINVAL;
+ }
+
+ devices_arr = kmalloc(args->n_devices * sizeof(*devices_arr),
+ GFP_KERNEL);
+ if (!devices_arr)
+ return -ENOMEM;
+
+ err = copy_from_user(devices_arr,
+ (void __user *)args->device_ids_array_ptr,
+ args->n_devices * sizeof(*devices_arr));
+ if (err != 0) {
+ err = -EFAULT;
+ goto copy_from_user_failed;
+ }
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_get_process_device_data(dev, p);
+ if (!pdd) {
+ err = PTR_ERR(pdd);
+ goto bind_process_to_device_failed;
+ }
+
+ mem = kfd_process_device_translate_handle(pdd,
+ GET_IDR_HANDLE(args->handle));
+ if (!mem) {
+ err = -ENOMEM;
+ goto get_mem_obj_from_handle_failed;
+ }
+
+ for (i = args->n_success; i < args->n_devices; i++) {
+ peer = kfd_device_by_id(devices_arr[i]);
+ if (!peer) {
+ err = -EINVAL;
+ goto get_mem_obj_from_handle_failed;
+ }
+
+ peer_pdd = kfd_get_process_device_data(peer, p);
+ if (!peer_pdd) {
+ err = -ENODEV;
+ goto get_mem_obj_from_handle_failed;
+ }
+ err = dev->kfd2kgd->unmap_memory_to_gpu(
+ peer->kgd, (struct kgd_mem *)mem, peer_pdd->vm);
+ if (err) {
+ pr_err("Failed to unmap from gpu %d/%d\n",
+ i, args->n_devices);
+ goto unmap_memory_from_gpu_failed;
+ }
+ args->n_success = i+1;
+ }
+ kfree(devices_arr);
+
+ mutex_unlock(&p->mutex);
+
+ return 0;
+
+bind_process_to_device_failed:
+get_mem_obj_from_handle_failed:
+unmap_memory_from_gpu_failed:
+ mutex_unlock(&p->mutex);
+copy_from_user_failed:
+ kfree(devices_arr);
+ return err;
+}
+
#define AMDKFD_IOCTL_DEF(ioctl, _func, _flags) \
[_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, \
.cmd_drv = 0, .name = #ioctl}
@@ -1111,6 +1472,22 @@ static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_PROCESS_APERTURES_NEW,
kfd_ioctl_get_process_apertures_new, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_ACQUIRE_VM,
+ kfd_ioctl_acquire_vm, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_ALLOC_MEMORY_OF_GPU,
+ kfd_ioctl_alloc_memory_of_gpu, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_FREE_MEMORY_OF_GPU,
+ kfd_ioctl_free_memory_of_gpu, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_MAP_MEMORY_TO_GPU,
+ kfd_ioctl_map_memory_to_gpu, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_UNMAP_MEMORY_FROM_GPU,
+ kfd_ioctl_unmap_memory_from_gpu, 0),
+
};
#define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)