diff options
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 32 | ||||
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 30 | ||||
| -rw-r--r-- | drivers/iommu/iommu.c | 119 | ||||
| -rw-r--r-- | drivers/iommu/msm_iommu.c | 25 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu.c | 18 | ||||
| -rw-r--r-- | drivers/iommu/omap-iovmm.c | 17 | ||||
| -rw-r--r-- | include/linux/iommu.h | 26 | ||||
| -rw-r--r-- | virt/kvm/iommu.c | 8 |
8 files changed, 205 insertions, 70 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 2a46b1d7a60..a7cbcd46af9 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -44,6 +44,24 @@ #define LOOP_TIMEOUT 100000 +/* + * This bitmap is used to advertise the page sizes our hardware support + * to the IOMMU core, which will then use this information to split + * physically contiguous memory regions it is mapping into page sizes + * that we support. + * + * Traditionally the IOMMU core just handed us the mappings directly, + * after making sure the size is an order of a 4KiB page and that the + * mapping has natural alignment. + * + * To retain this behavior, we currently advertise that we support + * all page sizes that are an order of 4KiB. + * + * If at some point we'd like to utilize the IOMMU core's new behavior, + * we could change this to advertise the real page sizes we support. + */ +#define AMD_IOMMU_PGSIZES (~0xFFFUL) + static DEFINE_RWLOCK(amd_iommu_devtable_lock); /* A list of preallocated protection domains */ @@ -3093,9 +3111,8 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, } static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, - phys_addr_t paddr, int gfp_order, int iommu_prot) + phys_addr_t paddr, size_t page_size, int iommu_prot) { - unsigned long page_size = 0x1000UL << gfp_order; struct protection_domain *domain = dom->priv; int prot = 0; int ret; @@ -3115,24 +3132,22 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, return ret; } -static int amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, - int gfp_order) +static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, + size_t page_size) { struct protection_domain *domain = dom->priv; - unsigned long page_size, unmap_size; + size_t unmap_size; if (domain->mode == PAGE_MODE_NONE) return -EINVAL; - page_size = 0x1000UL << gfp_order; - mutex_lock(&domain->api_lock); unmap_size = iommu_unmap_page(domain, iova, page_size); mutex_unlock(&domain->api_lock); domain_flush_tlb_pde(domain); - return get_order(unmap_size); + return unmap_size; } static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, @@ -3182,6 +3197,7 @@ static struct iommu_ops amd_iommu_ops = { .unmap = amd_iommu_unmap, .iova_to_phys = amd_iommu_iova_to_phys, .domain_has_cap = amd_iommu_domain_has_cap, + .pgsize_bitmap = AMD_IOMMU_PGSIZES, }; /***************************************************************************** diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a004c3945c6..c181883c2f9 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -78,6 +78,24 @@ #define LEVEL_STRIDE (9) #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) +/* + * This bitmap is used to advertise the page sizes our hardware support + * to the IOMMU core, which will then use this information to split + * physically contiguous memory regions it is mapping into page sizes + * that we support. + * + * Traditionally the IOMMU core just handed us the mappings directly, + * after making sure the size is an order of a 4KiB page and that the + * mapping has natural alignment. + * + * To retain this behavior, we currently advertise that we support + * all page sizes that are an order of 4KiB. + * + * If at some point we'd like to utilize the IOMMU core's new behavior, + * we could change this to advertise the real page sizes we support. + */ +#define INTEL_IOMMU_PGSIZES (~0xFFFUL) + static inline int agaw_to_level(int agaw) { return agaw + 2; @@ -3979,12 +3997,11 @@ static void intel_iommu_detach_device(struct iommu_domain *domain, static int intel_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t hpa, - int gfp_order, int iommu_prot) + size_t size, int iommu_prot) { struct dmar_domain *dmar_domain = domain->priv; u64 max_addr; int prot = 0; - size_t size; int ret; if (iommu_prot & IOMMU_READ) @@ -3994,7 +4011,6 @@ static int intel_iommu_map(struct iommu_domain *domain, if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping) prot |= DMA_PTE_SNP; - size = PAGE_SIZE << gfp_order; max_addr = iova + size; if (dmar_domain->max_addr < max_addr) { u64 end; @@ -4017,11 +4033,10 @@ static int intel_iommu_map(struct iommu_domain *domain, return ret; } -static int intel_iommu_unmap(struct iommu_domain *domain, - unsigned long iova, int gfp_order) +static size_t intel_iommu_unmap(struct iommu_domain *domain, + unsigned long iova, size_t size) { struct dmar_domain *dmar_domain = domain->priv; - size_t size = PAGE_SIZE << gfp_order; int order; order = dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, @@ -4030,7 +4045,7 @@ static int intel_iommu_unmap(struct iommu_domain *domain, if (dmar_domain->max_addr == iova + size) dmar_domain->max_addr = iova; - return order; + return PAGE_SIZE << order; } static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain, @@ -4069,6 +4084,7 @@ static struct iommu_ops intel_iommu_ops = { .unmap = intel_iommu_unmap, .iova_to_phys = intel_iommu_iova_to_phys, .domain_has_cap = intel_iommu_domain_has_cap, + .pgsize_bitmap = INTEL_IOMMU_PGSIZES, }; static void __devinit quirk_iommu_rwbf(struct pci_dev *dev) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 2fb2963df55..84cdd8ac81f 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> @@ -157,32 +159,125 @@ 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, gfp_order, 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; + 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)); - - return domain->ops->unmap(domain, iova, gfp_order); + /* 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/msm_iommu.c b/drivers/iommu/msm_iommu.c index 5865dd2e28f..08a90b88e40 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -42,6 +42,9 @@ __asm__ __volatile__ ( \ #define RCP15_PRRR(reg) MRC(reg, p15, 0, c10, c2, 0) #define RCP15_NMRR(reg) MRC(reg, p15, 0, c10, c2, 1) +/* bitmap of the page sizes currently supported */ +#define MSM_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M) + static int msm_iommu_tex_class[4]; DEFINE_SPINLOCK(msm_iommu_lock); @@ -352,7 +355,7 @@ fail: } static int msm_iommu_map(struct iommu_domain *domain, unsigned long va, - phys_addr_t pa, int order, int prot) + phys_addr_t pa, size_t len, int prot) { struct msm_priv *priv; unsigned long flags; @@ -363,7 +366,6 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long va, unsigned long *sl_pte; unsigned long sl_offset; unsigned int pgprot; - size_t len = 0x1000UL << order; int ret = 0, tex, sh; spin_lock_irqsave(&msm_iommu_lock, flags); @@ -463,8 +465,8 @@ fail: return ret; } -static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, - int order) +static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, + size_t len) { struct msm_priv *priv; unsigned long flags; @@ -474,7 +476,6 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, unsigned long *sl_table; unsigned long *sl_pte; unsigned long sl_offset; - size_t len = 0x1000UL << order; int i, ret = 0; spin_lock_irqsave(&msm_iommu_lock, flags); @@ -544,15 +545,12 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, ret = __flush_iotlb(domain); - /* - * the IOMMU API requires us to return the order of the unmapped - * page (on success). - */ - if (!ret) - ret = order; fail: spin_unlock_irqrestore(&msm_iommu_lock, flags); - return ret; + + /* the IOMMU API requires us to return how many bytes were unmapped */ + len = ret ? 0 : len; + return len; } static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, @@ -684,7 +682,8 @@ static struct iommu_ops msm_iommu_ops = { .map = msm_iommu_map, .unmap = msm_iommu_unmap, .iova_to_phys = msm_iommu_iova_to_phys, - .domain_has_cap = msm_iommu_domain_has_cap + .domain_has_cap = msm_iommu_domain_has_cap, + .pgsize_bitmap = MSM_IOMMU_PGSIZES, }; static int __init get_tex_class(int icp, int ocp, int mt, int nos) diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 8f32b2bf758..08cf7ec5b4a 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -33,6 +33,9 @@ (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true); \ __i++) +/* bitmap of the page sizes currently supported */ +#define OMAP_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M) + /** * struct omap_iommu_domain - omap iommu domain * @pgtable: the page table @@ -1019,12 +1022,11 @@ static void iopte_cachep_ctor(void *iopte) } static int omap_iommu_map(struct iommu_domain *domain, unsigned long da, - phys_addr_t pa, int order, int prot) + phys_addr_t pa, size_t bytes, int prot) { struct omap_iommu_domain *omap_domain = domain->priv; struct omap_iommu *oiommu = omap_domain->iommu_dev; struct device *dev = oiommu->dev; - size_t bytes = PAGE_SIZE << order; struct iotlb_entry e; int omap_pgsz; u32 ret, flags; @@ -1049,19 +1051,16 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da, return ret; } -static int omap_iommu_unmap(struct iommu_domain *domain, unsigned long da, - int order) +static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da, + size_t size) { struct omap_iommu_domain *omap_domain = domain->priv; struct omap_iommu *oiommu = omap_domain->iommu_dev; struct device *dev = oiommu->dev; - size_t unmap_size; - - dev_dbg(dev, "unmapping da 0x%lx order %d\n", da, order); - unmap_size = iopgtable_clear_entry(oiommu, da); + dev_dbg(dev, "unmapping da 0x%lx size %u\n", da, size); - return unmap_size ? get_order(unmap_size) : -EINVAL; + return iopgtable_clear_entry(oiommu, da); } static int @@ -1211,6 +1210,7 @@ static struct iommu_ops omap_iommu_ops = { .unmap = omap_iommu_unmap, .iova_to_phys = omap_iommu_iova_to_phys, .domain_has_cap = omap_iommu_domain_has_cap, + .pgsize_bitmap = OMAP_IOMMU_PGSIZES, }; static int __init omap_iommu_init(void) diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c index 46be456fcc0..6edc4ceba19 100644 --- a/drivers/iommu/omap-iovmm.c +++ b/drivers/iommu/omap-iovmm.c @@ -410,7 +410,6 @@ 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; @@ -429,12 +428,10 @@ 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; @@ -449,10 +446,9 @@ 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; } @@ -467,7 +463,8 @@ 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)); @@ -475,13 +472,11 @@ 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", diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 432acc4c054..cc26f89c4ee 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -48,19 +48,33 @@ struct iommu_domain { #ifdef CONFIG_IOMMU_API +/** + * struct iommu_ops - iommu ops and capabilities + * @domain_init: init iommu domain + * @domain_destroy: destroy iommu domain + * @attach_dev: attach device to an iommu domain + * @detach_dev: detach device from an iommu domain + * @map: map a physically contiguous memory region to an iommu domain + * @unmap: unmap a physically contiguous memory region from an iommu domain + * @iova_to_phys: translate iova to physical address + * @domain_has_cap: domain capabilities query + * @commit: commit iommu domain + * @pgsize_bitmap: bitmap of supported page sizes + */ struct iommu_ops { int (*domain_init)(struct iommu_domain *domain); void (*domain_destroy)(struct iommu_domain *domain); int (*attach_dev)(struct iommu_domain *domain, struct device *dev); void (*detach_dev)(struct iommu_domain *domain, struct device *dev); int (*map)(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, int gfp_order, int prot); - int (*unmap)(struct iommu_domain *domain, unsigned long iova, - int gfp_order); + phys_addr_t paddr, size_t size, int prot); + size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, + size_t size); phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, unsigned long iova); int (*domain_has_cap)(struct iommu_domain *domain, unsigned long cap); + unsigned long pgsize_bitmap; }; extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops); @@ -72,9 +86,9 @@ extern int iommu_attach_device(struct iommu_domain *domain, extern void iommu_detach_device(struct iommu_domain *domain, struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, int gfp_order, int prot); -extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova, - int gfp_order); + phys_addr_t paddr, size_t size, int prot); +extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, + size_t size); extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, unsigned long iova); extern int iommu_domain_has_cap(struct iommu_domain *domain, diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c index a195c07fa82..304d7e5717e 100644 --- a/virt/kvm/iommu.c +++ b/virt/kvm/iommu.c @@ -113,7 +113,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot) /* Map into IO address space */ r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn), - get_order(page_size), flags); + page_size, flags); if (r) { printk(KERN_ERR "kvm_iommu_map_address:" "iommu failed to map pfn=%llx\n", pfn); @@ -292,15 +292,15 @@ static void kvm_iommu_put_pages(struct kvm *kvm, while (gfn < end_gfn) { unsigned long unmap_pages; - int order; + size_t size; /* Get physical address */ phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); pfn = phys >> PAGE_SHIFT; /* Unmap address from IO address space */ - order = iommu_unmap(domain, gfn_to_gpa(gfn), 0); - unmap_pages = 1ULL << order; + size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE); + unmap_pages = 1ULL << get_order(size); /* Unpin all pages we just unmapped to not leak any memory */ kvm_unpin_pages(kvm, pfn, unmap_pages); |