On Tue, Jun 15, 2021 at 09:27:02PM +0800, Claire Chang wrote:
> Always have the pointer to the swiotlb pool used in struct device. This
> could help simplify the code for other pools.
Applying: swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used
error: patch failed: kernel/dma/swiotlb.c:339
error: kernel/dma/swiotlb.c: patch does not apply
..
Would you be OK rebasing this against devel/for-linus-5.14 please?
(And please send out with the Reviewed-by from Christopher)
Thank you!
>
> Signed-off-by: Claire Chang <tientzu@xxxxxxxxxxxx>
> ---
> drivers/base/core.c | 4 ++++
> include/linux/device.h | 4 ++++
> kernel/dma/swiotlb.c | 8 ++++----
> 3 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index b8a8c96dca58..eeb2d49d3aa3 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -27,6 +27,7 @@
> #include <linux/netdevice.h>
> #include <linux/sched/signal.h>
> #include <linux/sched/mm.h>
> +#include <linux/swiotlb.h>
> #include <linux/sysfs.h>
> #include <linux/dma-map-ops.h> /* for dma_default_coherent */
>
> @@ -2846,6 +2847,9 @@ void device_initialize(struct device *dev)
> defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
> dev->dma_coherent = dma_default_coherent;
> #endif
> +#ifdef CONFIG_SWIOTLB
> + dev->dma_io_tlb_mem = io_tlb_default_mem;
> +#endif
> }
> EXPORT_SYMBOL_GPL(device_initialize);
>
> 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/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 97c6ad50fdc2..949a6bb21343 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -339,7 +339,7 @@ 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;
> @@ -421,7 +421,7 @@ 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;
> @@ -498,7 +498,7 @@ 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;
> @@ -549,7 +549,7 @@ 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
>
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