Re: [PATCH 14/15] vmd: use the proper dma_* APIs instead of direct methods calls

Bjorn Helgaas
2018-12-14T21:17:57Z

Conventional spelling in subject is

PCI: vmd: Use dma_* APIs instead of direct method calls

On Fri, Dec 07, 2018 at 11:07:19AM -0800, Christoph Hellwig wrote:
> With the bypass support for the direct mapping we might not always have
> methods to call, so use the proper APIs instead. The only downside is
> that we will create two dma-debug entries for each mapping if
> CONFIG_DMA_DEBUG is enabled.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

You cc'd the VMD maintainers already, and I have no objection to this
from a PCI core point of view, so:

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> drivers/pci/controller/vmd.c | 42 +++++++++++++++---------------------
> 1 file changed, 17 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
> index 98ce79eac128..3890812cdf87 100644
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -307,39 +307,32 @@ static struct device *to_vmd_dev(struct device *dev)
> return &vmd->dev->dev;
> }
>
> -static const struct dma_map_ops *vmd_dma_ops(struct device *dev)
> -{
> - return get_dma_ops(to_vmd_dev(dev));
> -}
> -
> static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
> gfp_t flag, unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
> - attrs);
> + return dma_alloc_attrs(to_vmd_dev(dev), size, addr, flag, attrs);
> }
>
> static void vmd_free(struct device *dev, size_t size, void *vaddr,
> dma_addr_t addr, unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
> - attrs);
> + return dma_free_attrs(to_vmd_dev(dev), size, vaddr, addr, attrs);
> }
>
> static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
> void *cpu_addr, dma_addr_t addr, size_t size,
> unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
> - size, attrs);
> + return dma_mmap_attrs(to_vmd_dev(dev), vma, cpu_addr, addr, size,
> + attrs);
> }
>
> static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
> void *cpu_addr, dma_addr_t addr, size_t size,
> unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
> - addr, size, attrs);
> + return dma_get_sgtable_attrs(to_vmd_dev(dev), sgt, cpu_addr, addr, size,
> + attrs);
> }
>
> static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
> @@ -347,61 +340,60 @@ static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
> enum dma_data_direction dir,
> unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
> - dir, attrs);
> + return dma_map_page_attrs(to_vmd_dev(dev), page, offset, size, dir,
> + attrs);
> }
>
> static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
> enum dma_data_direction dir, unsigned long attrs)
> {
> - vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
> + dma_unmap_page_attrs(to_vmd_dev(dev), addr, size, dir, attrs);
> }
>
> static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
> enum dma_data_direction dir, unsigned long attrs)
> {
> - return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
> + return dma_map_sg_attrs(to_vmd_dev(dev), sg, nents, dir, attrs);
> }
>
> static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
> enum dma_data_direction dir, unsigned long attrs)
> {
> - vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
> + dma_unmap_sg_attrs(to_vmd_dev(dev), sg, nents, dir, attrs);
> }
>
> static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
> size_t size, enum dma_data_direction dir)
> {
> - vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
> + dma_sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
> }
>
> static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
> size_t size, enum dma_data_direction dir)
> {
> - vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
> - dir);
> + dma_sync_single_for_device(to_vmd_dev(dev), addr, size, dir);
> }
>
> static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
> int nents, enum dma_data_direction dir)
> {
> - vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
> + dma_sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
> }
>
> static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
> int nents, enum dma_data_direction dir)
> {
> - vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
> + dma_sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
> }
>
> static int vmd_dma_supported(struct device *dev, u64 mask)
> {
> - return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
> + return dma_supported(to_vmd_dev(dev), mask);
> }
>
> static u64 vmd_get_required_mask(struct device *dev)
> {
> - return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
> + return dma_get_required_mask(to_vmd_dev(dev));
> }
>
> static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
> --
> 2.19.1
>