I'm not sure if this would break arch/x86/pci/sta2x11-fixup.c
swiotlb_late_init_with_default_size is called here
https://elixir.bootlin.com/linux/v5.13-rc5/source/arch/x86/pci/sta2x11-fixup.c#L60
On Fri, Jun 11, 2021 at 11:27 PM Claire Chang <tien...@chromium.org> wrote:
>
> Always have the pointer to the swiotlb pool used in struct device. This
> could help simplify the code for other pools.
>
> Signed-off-by: Claire Chang <tien...@chromium.org>
> ---
> drivers/of/device.c | 3 +++
> include/linux/device.h | 4 ++++
> include/linux/swiotlb.h | 8 ++++++++
> kernel/dma/swiotlb.c | 8 ++++----
> 4 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index c5a9473a5fb1..1defdf15ba95 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -165,6 +165,9 @@ int of_dma_configure_id(struct device *dev, struct
> device_node *np,
>
> arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
>
> + if (IS_ENABLED(CONFIG_SWIOTLB))
> + swiotlb_set_io_tlb_default_mem(dev);
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(of_dma_configure_id);
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 4443e12238a0..2e9a378c9100 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -432,6 +432,7 @@ struct dev_links_info {
> * @dma_pools: Dma pools (if dma'ble device).
> * @dma_mem: Internal for coherent mem override.
> * @cma_area: Contiguous memory area for dma allocations
> + * @dma_io_tlb_mem: Pointer to the swiotlb pool used. Not for driver use.
> * @archdata: For arch-specific additions.
> * @of_node: Associated device tree node.
> * @fwnode: Associated device node supplied by platform firmware.
> @@ -540,6 +541,9 @@ struct device {
> #ifdef CONFIG_DMA_CMA
> struct cma *cma_area; /* contiguous memory area for dma
> allocations */
> +#endif
> +#ifdef CONFIG_SWIOTLB
> + struct io_tlb_mem *dma_io_tlb_mem;
> #endif
> /* arch specific additions */
> struct dev_archdata archdata;
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index 216854a5e513..008125ccd509 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -108,6 +108,11 @@ static inline bool is_swiotlb_buffer(phys_addr_t paddr)
> return mem && paddr >= mem->start && paddr < mem->end;
> }
>
> +static inline void swiotlb_set_io_tlb_default_mem(struct device *dev)
> +{
> + dev->dma_io_tlb_mem = io_tlb_default_mem;
> +}
> +
> void __init swiotlb_exit(void);
> unsigned int swiotlb_max_segment(void);
> size_t swiotlb_max_mapping_size(struct device *dev);
> @@ -119,6 +124,9 @@ static inline bool is_swiotlb_buffer(phys_addr_t paddr)
> {
> return false;
> }
> +static inline void swiotlb_set_io_tlb_default_mem(struct device *dev)
> +{
> +}
> static inline void swiotlb_exit(void)
> {
> }
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 8a3e2b3b246d..29b950ab1351 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -344,7 +344,7 @@ void __init swiotlb_exit(void)
> static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t
> size,
> enum dma_data_direction dir)
> {
> - struct io_tlb_mem *mem = io_tlb_default_mem;
> + struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
> phys_addr_t orig_addr = mem->slots[index].orig_addr;
> size_t alloc_size = mem->slots[index].alloc_size;
> @@ -426,7 +426,7 @@ static unsigned int wrap_index(struct io_tlb_mem *mem,
> unsigned int index)
> static int find_slots(struct device *dev, phys_addr_t orig_addr,
> size_t alloc_size)
> {
> - struct io_tlb_mem *mem = io_tlb_default_mem;
> + struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> unsigned long boundary_mask = dma_get_seg_boundary(dev);
> dma_addr_t tbl_dma_addr =
> phys_to_dma_unencrypted(dev, mem->start) & boundary_mask;
> @@ -503,7 +503,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev,
> phys_addr_t orig_addr,
> size_t mapping_size, size_t alloc_size,
> enum dma_data_direction dir, unsigned long attrs)
> {
> - struct io_tlb_mem *mem = io_tlb_default_mem;
> + struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> unsigned int offset = swiotlb_align_offset(dev, orig_addr);
> unsigned int i;
> int index;
> @@ -554,7 +554,7 @@ void swiotlb_tbl_unmap_single(struct device *hwdev,
> phys_addr_t tlb_addr,
> size_t mapping_size, enum dma_data_direction
> dir,
> unsigned long attrs)
> {
> - struct io_tlb_mem *mem = io_tlb_default_mem;
> + struct io_tlb_mem *mem = hwdev->dma_io_tlb_mem;
> unsigned long flags;
> unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
> int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
> --
> 2.32.0.272.g935e593368-goog
>
