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drm/amdkfd: Allocate doorbells only when needed 

Only allocate doorbells when the first queue is created on a GPU or the
doorbells need to be mapped into CPU or GPU virtual address space. This
avoids allocating doorbells unnecessarily and can allow more processes
to use KFD on multi-GPU systems.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Kent Russell <kent.Russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2022-08-03 14:45:45 -04:00 committed by Alex Deucher
parent 8243df4778
commit 16f0013157
3 changed files with 22 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -327,6 +327,12 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
goto err_bind_process;
}
if (!pdd->doorbell_index &&
kfd_alloc_process_doorbells(dev, &pdd->doorbell_index) < 0) {
err = -ENOMEM;
goto err_alloc_doorbells;
}
/* Starting with GFX11, wptr BOs must be mapped to GART for MES to determine work
* on unmapped queues for usermode queue oversubscription (no aggregated doorbell)
*/
@ -404,6 +410,7 @@ err_create_queue:
if (wptr_bo)
amdgpu_amdkfd_free_gtt_mem(dev->adev, wptr_bo);
err_wptr_map_gart:
err_alloc_doorbells:
err_bind_process:
err_pdd:
mutex_unlock(&p->mutex);
@ -1092,6 +1099,10 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
goto err_unlock;
}
offset = kfd_get_process_doorbells(pdd);
if (!offset) {
err = -ENOMEM;
goto err_unlock;
}
} else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP) {
if (args->size != PAGE_SIZE) {
err = -EINVAL;
@ -2173,6 +2184,8 @@ static int criu_restore_memory_of_gpu(struct kfd_process_device *pdd,
return -EINVAL;
offset = kfd_get_process_doorbells(pdd);
if (!offset)
return -ENOMEM;
} else if (bo_bucket->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP) {
/* MMIO BOs need remapped bus address */
if (bo_bucket->size != PAGE_SIZE) {

9
drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
View File

@ -157,6 +157,8 @@ int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process,
/* Calculate physical address of doorbell */
address = kfd_get_process_doorbells(pdd);
if (!address)
return -ENOMEM;
vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
VM_DONTDUMP | VM_PFNMAP;
@ -275,6 +277,13 @@ uint64_t kfd_get_number_elems(struct kfd_dev *kfd)
phys_addr_t kfd_get_process_doorbells(struct kfd_process_device *pdd)
{
if (!pdd->doorbell_index) {
int r = kfd_alloc_process_doorbells(pdd->dev,
&pdd->doorbell_index);
if (r)
return 0;
}
return pdd->dev->doorbell_base +
pdd->doorbell_index * kfd_doorbell_process_slice(pdd->dev);
}

5
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@ -1499,11 +1499,6 @@ struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
if (!pdd)
return NULL;
if (kfd_alloc_process_doorbells(dev, &pdd->doorbell_index) < 0) {
pr_err("Failed to alloc doorbell for pdd\n");
goto err_free_pdd;
}
if (init_doorbell_bitmap(&pdd->qpd, dev)) {
pr_err("Failed to init doorbell for process\n");
goto err_free_pdd;