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Date: Fri, 19 Dec 2008 09:39:58 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Becky Bruce <beckyb@...nel.crashing.org>
CC: mingo@...e.hu, fujita.tomonori@....ntt.co.jp,
linux-kernel@...r.kernel.org, ian.campbell@...rix.com,
jbeulich@...ell.com, joerg.roedel@....com, benh@...nel.crashing.org
Subject: Re: [PATCH 06/11] swiotlb: Store phys address in io_tlb_orig_addr
array
Becky Bruce wrote:
> When we enable swiotlb for platforms that support HIGHMEM, we
> can no longer store the virtual address of the original dma
> buffer, because that buffer might not have a permament mapping.
> Change the iotlb code to instead store the physical address of
> the original buffer.
>
Hm, yes, I think using a phys_addr_t may end up being cleaner than using
struct page *+offset.
J
> Signed-off-by: Becky Bruce <beckyb@...nel.crashing.org>
> ---
> lib/swiotlb.c | 47 ++++++++++++++++++++++++-----------------------
> 1 files changed, 24 insertions(+), 23 deletions(-)
>
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index ed4f44a..e9d5bf6 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -118,7 +118,7 @@ static unsigned int io_tlb_index;
> * We need to save away the original address corresponding to a mapped entry
> * for the sync operations.
> */
> -static unsigned char **io_tlb_orig_addr;
> +static phys_addr_t *io_tlb_orig_addr;
>
> /*
> * Protect the above data structures in the map and unmap calls
> @@ -175,7 +175,7 @@ swiotlb_init_with_default_size(size_t default_size)
> for (i = 0; i < io_tlb_nslabs; i++)
> io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
> io_tlb_index = 0;
> - io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *));
> + io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
>
> /*
> * Get the overflow emergency buffer
> @@ -253,12 +253,14 @@ swiotlb_late_init_with_default_size(size_t default_size)
> io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
> io_tlb_index = 0;
>
> - io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL,
> - get_order(io_tlb_nslabs * sizeof(char *)));
> + io_tlb_orig_addr = (phys_addr_t *)
> + __get_free_pages(GFP_KERNEL,
> + get_order(io_tlb_nslabs *
> + sizeof(phys_addr_t)));
> if (!io_tlb_orig_addr)
> goto cleanup3;
>
> - memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *));
> + memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
>
> /*
> * Get the overflow emergency buffer
> @@ -276,8 +278,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
> return 0;
>
> cleanup4:
> - free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
> - sizeof(char *)));
> + free_pages((unsigned long)io_tlb_orig_addr,
> + get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
> io_tlb_orig_addr = NULL;
> cleanup3:
> free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
> @@ -307,7 +309,7 @@ static int is_swiotlb_buffer(char *addr)
> * Allocates bounce buffer and returns its kernel virtual address.
> */
> static void *
> -map_single(struct device *hwdev, char *buffer, size_t size, int dir)
> +map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
> {
> unsigned long flags;
> char *dma_addr;
> @@ -398,9 +400,9 @@ found:
> * needed.
> */
> for (i = 0; i < nslots; i++)
> - io_tlb_orig_addr[index+i] = buffer + (i << IO_TLB_SHIFT);
> + io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
> if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
> - memcpy(dma_addr, buffer, size);
> + memcpy(dma_addr, phys_to_virt(phys), size);
>
> return dma_addr;
> }
> @@ -414,17 +416,17 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
> unsigned long flags;
> int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
> int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
> - char *buffer = io_tlb_orig_addr[index];
> + phys_addr_t phys = io_tlb_orig_addr[index];
>
> /*
> * First, sync the memory before unmapping the entry
> */
> - if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
> + if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
> /*
> * bounce... copy the data back into the original buffer * and
> * delete the bounce buffer.
> */
> - memcpy(buffer, dma_addr, size);
> + memcpy(phys_to_virt(phys), dma_addr, size);
>
> /*
> * Return the buffer to the free list by setting the corresponding
> @@ -457,20 +459,20 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
> int dir, int target)
> {
> int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
> - char *buffer = io_tlb_orig_addr[index];
> + phys_addr_t phys = io_tlb_orig_addr[index];
>
> - buffer += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
> + phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
>
> switch (target) {
> case SYNC_FOR_CPU:
> if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
> - memcpy(buffer, dma_addr, size);
> + memcpy(phys_to_virt(phys), dma_addr, size);
> else
> BUG_ON(dir != DMA_TO_DEVICE);
> break;
> case SYNC_FOR_DEVICE:
> if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
> - memcpy(dma_addr, buffer, size);
> + memcpy(dma_addr, phys_to_virt(phys), size);
> else
> BUG_ON(dir != DMA_FROM_DEVICE);
> break;
> @@ -509,7 +511,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> * swiotlb_map_single(), which will grab memory from
> * the lowest available address range.
> */
> - ret = map_single(hwdev, NULL, size, DMA_FROM_DEVICE);
> + ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
> if (!ret)
> return NULL;
> }
> @@ -591,7 +593,7 @@ swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
> /*
> * Oh well, have to allocate and map a bounce buffer.
> */
> - map = map_single(hwdev, ptr, size, dir);
> + map = map_single(hwdev, virt_to_phys(ptr), size, dir);
> if (!map) {
> swiotlb_full(hwdev, size, dir, 1);
> map = io_tlb_overflow_buffer;
> @@ -736,18 +738,17 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
> int dir, struct dma_attrs *attrs)
> {
> struct scatterlist *sg;
> - void *addr;
> dma_addr_t dev_addr;
> int i;
>
> BUG_ON(dir == DMA_NONE);
>
> for_each_sg(sgl, sg, nelems, i) {
> - addr = sg_virt(sg);
> - dev_addr = virt_to_dma_addr(hwdev, addr);
> + dev_addr = SG_ENT_BUS_ADDRESS(hwdev, sg);
> if (swiotlb_force ||
> swiotlb_addr_needs_mapping(hwdev, dev_addr, sg->length)) {
> - void *map = map_single(hwdev, addr, sg->length, dir);
> + void *map = map_single(hwdev, sg_phys(sg), sg->length,
> + dir);
> if (!map) {
> /* Don't panic here, we expect map_sg users
> to do proper error handling. */
>
--
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