diff options
| author | FUJITA Tomonori <tomof@acm.org> | 2008-02-04 22:28:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:10 -0800 |
| commit | fde6a3c82d67f592eb587be4d12222b0ae6d4321 (patch) | |
| tree | 33c79ecea87dc99a9c4961b6ab42d53c46f1f8f2 /arch | |
| parent | 7c53664dcd5df7349edb56f04c743bf66510a6f1 (diff) | |
iommu sg merging: sparc64: make iommu respect the segment size limits
This patch makes iommu respect segment size limits when merging sg
lists.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/iommu.c | 2 | ||||
| -rw-r--r-- | arch/sparc64/kernel/iommu_common.c | 8 | ||||
| -rw-r--r-- | arch/sparc64/kernel/iommu_common.h | 3 | ||||
| -rw-r--r-- | arch/sparc64/kernel/pci_sun4v.c | 2 |
4 files changed, 10 insertions, 5 deletions
diff --git a/arch/sparc64/kernel/iommu.c b/arch/sparc64/kernel/iommu.c index 070a4846c0c..4b9115a4d92 100644 --- a/arch/sparc64/kernel/iommu.c +++ b/arch/sparc64/kernel/iommu.c @@ -580,7 +580,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist, /* Step 1: Prepare scatter list. */ - npages = prepare_sg(sglist, nelems); + npages = prepare_sg(dev, sglist, nelems); /* Step 2: Allocate a cluster and context, if necessary. */ diff --git a/arch/sparc64/kernel/iommu_common.c b/arch/sparc64/kernel/iommu_common.c index efd5dff85f6..72a4acfe8c7 100644 --- a/arch/sparc64/kernel/iommu_common.c +++ b/arch/sparc64/kernel/iommu_common.c @@ -4,6 +4,7 @@ * Copyright (C) 1999 David S. Miller (davem@redhat.com) */ +#include <linux/dma-mapping.h> #include "iommu_common.h" /* You are _strongly_ advised to enable the following debugging code @@ -201,21 +202,24 @@ void verify_sglist(struct scatterlist *sglist, int nents, iopte_t *iopte, int np } #endif -unsigned long prepare_sg(struct scatterlist *sg, int nents) +unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents) { struct scatterlist *dma_sg = sg; unsigned long prev; u32 dent_addr, dent_len; + unsigned int max_seg_size; prev = (unsigned long) sg_virt(sg); prev += (unsigned long) (dent_len = sg->length); dent_addr = (u32) ((unsigned long)(sg_virt(sg)) & (IO_PAGE_SIZE - 1UL)); + max_seg_size = dma_get_max_seg_size(dev); while (--nents) { unsigned long addr; sg = sg_next(sg); addr = (unsigned long) sg_virt(sg); - if (! VCONTIG(prev, addr)) { + if (! VCONTIG(prev, addr) || + dent_len + sg->length > max_seg_size) { dma_sg->dma_address = dent_addr; dma_sg->dma_length = dent_len; dma_sg = sg_next(dma_sg); diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h index 75b5a581452..a90d046e802 100644 --- a/arch/sparc64/kernel/iommu_common.h +++ b/arch/sparc64/kernel/iommu_common.h @@ -9,6 +9,7 @@ #include <linux/sched.h> #include <linux/mm.h> #include <linux/scatterlist.h> +#include <linux/device.h> #include <asm/iommu.h> #include <asm/scatterlist.h> @@ -46,4 +47,4 @@ extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int #define VCONTIG(__X, __Y) (((__X) == (__Y)) || \ (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL) -extern unsigned long prepare_sg(struct scatterlist *sg, int nents); +extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents); diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c index 1aa8e044b10..67d6dce90b1 100644 --- a/arch/sparc64/kernel/pci_sun4v.c +++ b/arch/sparc64/kernel/pci_sun4v.c @@ -490,7 +490,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist, goto bad; /* Step 1: Prepare scatter list. */ - npages = prepare_sg(sglist, nelems); + npages = prepare_sg(dev, sglist, nelems); /* Step 2: Allocate a cluster and context, if necessary. */ spin_lock_irqsave(&iommu->lock, flags); |