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 <tientzu@xxxxxxxxxxxx> 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 <tientzu@xxxxxxxxxxxx> > --- > 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 >
