redonkable/alistair23-linux
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drm/amdkfd: Use kfd fd to mmap mmio

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TTM doesn't support CPU mapping of sg type bo (under which
mmio bo is created). Switch mmaping of mmio page to kfd
device file.

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Acked-by: Christian Konig <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Oak Zeng 2019-05-23 17:12:41 -05:00 committed by Alex Deucher
parent c8bdf2b63e
commit d33ea570bd
2 changed files with 46 additions and 0 deletions
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45
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View file

@ -1309,6 +1309,14 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
args->handle = MAKE_HANDLE(args->gpu_id, idr_handle);
args->mmap_offset = offset;
/* MMIO is mapped through kfd device
* Generate a kfd mmap offset
*/
if (flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP) {
args->mmap_offset = KFD_MMAP_TYPE_MMIO | KFD_MMAP_GPU_ID(args->gpu_id);
args->mmap_offset <<= PAGE_SHIFT;
}
return 0;
err_free:
@ -1853,6 +1861,39 @@ err_i1:
return retcode;
}
static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process,
struct vm_area_struct *vma)
{
phys_addr_t address;
int ret;
if (vma->vm_end - vma->vm_start != PAGE_SIZE)
return -EINVAL;
address = amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd);
vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
VM_DONTDUMP | VM_PFNMAP;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pr_debug("Process %d mapping mmio page\n"
" target user address == 0x%08llX\n"
" physical address == 0x%08llX\n"
" vm_flags == 0x%04lX\n"
" size == 0x%04lX\n",
process->pasid, (unsigned long long) vma->vm_start,
address, vma->vm_flags, PAGE_SIZE);
ret = io_remap_pfn_range(vma,
vma->vm_start,
address >> PAGE_SHIFT,
PAGE_SIZE,
vma->vm_page_prot);
return ret;
}
static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct kfd_process *process;
@ -1883,6 +1924,10 @@ static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
if (!dev)
return -ENODEV;
return kfd_reserved_mem_mmap(dev, process, vma);
case KFD_MMAP_TYPE_MMIO:
if (!dev)
return -ENODEV;
return kfd_mmio_mmap(dev, process, vma);
}
return -EFAULT;

1
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View file

@ -59,6 +59,7 @@
#define KFD_MMAP_TYPE_DOORBELL (0x3ULL << KFD_MMAP_TYPE_SHIFT)
#define KFD_MMAP_TYPE_EVENTS (0x2ULL << KFD_MMAP_TYPE_SHIFT)
#define KFD_MMAP_TYPE_RESERVED_MEM (0x1ULL << KFD_MMAP_TYPE_SHIFT)
#define KFD_MMAP_TYPE_MMIO (0x0ULL << KFD_MMAP_TYPE_SHIFT)
#define KFD_MMAP_GPU_ID_SHIFT (46 - PAGE_SHIFT)
#define KFD_MMAP_GPU_ID_MASK (((1ULL << KFD_GPU_ID_HASH_WIDTH) - 1) \