diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/iommu.c | 131 | ||||
| -rw-r--r-- | drivers/iommu/omap-iovmm.c | 17 |
2 files changed, 123 insertions, 25 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 7a2953d8f12..b278458d581 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -16,6 +16,8 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#define pr_fmt(fmt) "%s: " fmt, __func__ + #include <linux/device.h> #include <linux/kernel.h> #include <linux/bug.h> @@ -47,6 +49,16 @@ int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops) if (bus->iommu_ops != NULL) return -EBUSY; + /* + * Set the default pgsize values, which retain the existing + * IOMMU API behavior: drivers will be called to map + * regions that are sized/aligned to order of 4KiB pages. + * + * This will be removed once all drivers are migrated. + */ + if (!ops->pgsize_bitmap) + ops->pgsize_bitmap = ~0xFFFUL; + bus->iommu_ops = ops; /* Do IOMMU specific setup for this bus-type */ @@ -157,34 +169,125 @@ int iommu_domain_has_cap(struct iommu_domain *domain, EXPORT_SYMBOL_GPL(iommu_domain_has_cap); int iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, int gfp_order, int prot) + phys_addr_t paddr, size_t size, int prot) { - size_t size; + unsigned long orig_iova = iova; + unsigned int min_pagesz; + size_t orig_size = size; + int ret = 0; if (unlikely(domain->ops->map == NULL)) return -ENODEV; - size = PAGE_SIZE << gfp_order; + /* find out the minimum page size supported */ + min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap); + + /* + * both the virtual address and the physical one, as well as + * the size of the mapping, must be aligned (at least) to the + * size of the smallest page supported by the hardware + */ + if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { + pr_err("unaligned: iova 0x%lx pa 0x%lx size 0x%lx min_pagesz " + "0x%x\n", iova, (unsigned long)paddr, + (unsigned long)size, min_pagesz); + return -EINVAL; + } + + pr_debug("map: iova 0x%lx pa 0x%lx size 0x%lx\n", iova, + (unsigned long)paddr, (unsigned long)size); + + while (size) { + unsigned long pgsize, addr_merge = iova | paddr; + unsigned int pgsize_idx; + + /* Max page size that still fits into 'size' */ + pgsize_idx = __fls(size); + + /* need to consider alignment requirements ? */ + if (likely(addr_merge)) { + /* Max page size allowed by both iova and paddr */ + unsigned int align_pgsize_idx = __ffs(addr_merge); + + pgsize_idx = min(pgsize_idx, align_pgsize_idx); + } + + /* build a mask of acceptable page sizes */ + pgsize = (1UL << (pgsize_idx + 1)) - 1; + + /* throw away page sizes not supported by the hardware */ + pgsize &= domain->ops->pgsize_bitmap; - BUG_ON(!IS_ALIGNED(iova | paddr, size)); + /* make sure we're still sane */ + BUG_ON(!pgsize); - return domain->ops->map(domain, iova, paddr, size, prot); + /* pick the biggest page */ + pgsize_idx = __fls(pgsize); + pgsize = 1UL << pgsize_idx; + + pr_debug("mapping: iova 0x%lx pa 0x%lx pgsize %lu\n", iova, + (unsigned long)paddr, pgsize); + + ret = domain->ops->map(domain, iova, paddr, pgsize, prot); + if (ret) + break; + + iova += pgsize; + paddr += pgsize; + size -= pgsize; + } + + /* unroll mapping in case something went wrong */ + if (ret) + iommu_unmap(domain, orig_iova, orig_size - size); + + return ret; } EXPORT_SYMBOL_GPL(iommu_map); -int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order) +size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) { - size_t size, unmapped; + size_t unmapped_page, unmapped = 0; + unsigned int min_pagesz; if (unlikely(domain->ops->unmap == NULL)) return -ENODEV; - size = PAGE_SIZE << gfp_order; - - BUG_ON(!IS_ALIGNED(iova, size)); - - unmapped = domain->ops->unmap(domain, iova, size); - - return get_order(unmapped); + /* find out the minimum page size supported */ + min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap); + + /* + * The virtual address, as well as the size of the mapping, must be + * aligned (at least) to the size of the smallest page supported + * by the hardware + */ + if (!IS_ALIGNED(iova | size, min_pagesz)) { + pr_err("unaligned: iova 0x%lx size 0x%lx min_pagesz 0x%x\n", + iova, (unsigned long)size, min_pagesz); + return -EINVAL; + } + + pr_debug("unmap this: iova 0x%lx size 0x%lx\n", iova, + (unsigned long)size); + + /* + * Keep iterating until we either unmap 'size' bytes (or more) + * or we hit an area that isn't mapped. + */ + while (unmapped < size) { + size_t left = size - unmapped; + + unmapped_page = domain->ops->unmap(domain, iova, left); + if (!unmapped_page) + break; + + pr_debug("unmapped: iova 0x%lx size %lx\n", iova, + (unsigned long)unmapped_page); + + iova += unmapped_page; + unmapped += unmapped_page; + } + + return unmapped; } EXPORT_SYMBOL_GPL(iommu_unmap); diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c index e8fdb8830f6..0b7b14cb030 100644 --- a/drivers/iommu/omap-iovmm.c +++ b/drivers/iommu/omap-iovmm.c @@ -409,7 +409,6 @@ static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new, unsigned int i, j; struct scatterlist *sg; u32 da = new->da_start; - int order; if (!domain || !sgt) return -EINVAL; @@ -428,12 +427,10 @@ static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new, if (bytes_to_iopgsz(bytes) < 0) goto err_out; - order = get_order(bytes); - pr_debug("%s: [%d] %08x %08x(%x)\n", __func__, i, da, pa, bytes); - err = iommu_map(domain, da, pa, order, flags); + err = iommu_map(domain, da, pa, bytes, flags); if (err) goto err_out; @@ -448,10 +445,9 @@ err_out: size_t bytes; bytes = sg->length + sg->offset; - order = get_order(bytes); /* ignore failures.. we're already handling one */ - iommu_unmap(domain, da, order); + iommu_unmap(domain, da, bytes); da += bytes; } @@ -466,7 +462,8 @@ static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj, size_t total = area->da_end - area->da_start; const struct sg_table *sgt = area->sgt; struct scatterlist *sg; - int i, err; + int i; + size_t unmapped; BUG_ON(!sgtable_ok(sgt)); BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE)); @@ -474,13 +471,11 @@ static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj, start = area->da_start; for_each_sg(sgt->sgl, sg, sgt->nents, i) { size_t bytes; - int order; bytes = sg->length + sg->offset; - order = get_order(bytes); - err = iommu_unmap(domain, start, order); - if (err < 0) + unmapped = iommu_unmap(domain, start, bytes); + if (unmapped < bytes) break; dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n", |