Hi Oak,
I'm not sure why this is part of the GWS patch series. It's unrelated to
GWS. Anyway, see one comment inline.
On 2019-05-23 6:41 p.m., Zeng, Oak wrote:
> 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.
>
> Change-Id: I1a1a24f2ac0662be3783d460c137731ade007b83
> Signed-off-by: Oak Zeng <Oak.Zeng@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 46 ++++++++++++++++++++++++++++++++
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 +
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 455a3db..67d269b 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1309,6 +1309,15 @@ 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;
> + args->mmap_offset |= amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd);
It seems the mmio_remap_phys_addr doesn't need to be part of the
mmap_offset. It's not used for anything in kfd_mmap. And it
unnecessarily exposes a physical address to user mode, which we usually
tend to avoid.
With that fixes, the patch is Reviewed-by: Felix Kuehling
<Felix.Kuehling@xxxxxxx>
Regards,
Felix
> + }
> +
> return 0;
>
> err_free:
> @@ -1880,6 +1889,39 @@ static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
> 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;
> @@ -1910,6 +1952,10 @@ 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;
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index 40a5c67..b61dc53 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -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) \
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