diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/iommu/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu-debug.c | 114 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu.c | 13 | ||||
| -rw-r--r-- | drivers/iommu/omap-iommu.h | 8 | ||||
| -rw-r--r-- | drivers/iommu/omap-iovmm.c | 791 |
6 files changed, 6 insertions, 931 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index d260605e6d5f..154e5a838257 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -143,16 +143,12 @@ config OMAP_IOMMU depends on ARCH_OMAP2PLUS select IOMMU_API -config OMAP_IOVMM - tristate "OMAP IO Virtual Memory Manager Support" - depends on OMAP_IOMMU - config OMAP_IOMMU_DEBUG - tristate "Export OMAP IOMMU/IOVMM internals in DebugFS" - depends on OMAP_IOVMM && DEBUG_FS + tristate "Export OMAP IOMMU internals in DebugFS" + depends on OMAP_IOMMU && DEBUG_FS help Select this to see extensive information about - the internal state of OMAP IOMMU/IOVMM in debugfs. + the internal state of OMAP IOMMU in debugfs. Say N unless you know you need this. diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile index 8893bad048e0..6a4a00ef088b 100644 --- a/drivers/iommu/Makefile +++ b/drivers/iommu/Makefile @@ -11,7 +11,6 @@ obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o obj-$(CONFIG_OMAP_IOMMU) += omap-iommu2.o -obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c index 80fffba7f12d..531658d17333 100644 --- a/drivers/iommu/omap-iommu-debug.c +++ b/drivers/iommu/omap-iommu-debug.c @@ -213,116 +213,6 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, return bytes; } -static ssize_t debug_read_mmap(struct file *file, char __user *userbuf, - size_t count, loff_t *ppos) -{ - struct device *dev = file->private_data; - struct omap_iommu *obj = dev_to_omap_iommu(dev); - char *p, *buf; - struct iovm_struct *tmp; - int uninitialized_var(i); - ssize_t bytes; - - buf = (char *)__get_free_page(GFP_KERNEL); - if (!buf) - return -ENOMEM; - p = buf; - - p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n", - "No", "start", "end", "size", "flags"); - p += sprintf(p, "-------------------------------------------------\n"); - - mutex_lock(&iommu_debug_lock); - - list_for_each_entry(tmp, &obj->mmap, list) { - size_t len; - const char *str = "%3d %08x-%08x %6x %8x\n"; - const int maxcol = 39; - - len = tmp->da_end - tmp->da_start; - p += snprintf(p, maxcol, str, - i, tmp->da_start, tmp->da_end, len, tmp->flags); - - if (PAGE_SIZE - (p - buf) < maxcol) - break; - i++; - } - - bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); - - mutex_unlock(&iommu_debug_lock); - free_page((unsigned long)buf); - - return bytes; -} - -static ssize_t debug_read_mem(struct file *file, char __user *userbuf, - size_t count, loff_t *ppos) -{ - struct device *dev = file->private_data; - char *p, *buf; - struct iovm_struct *area; - ssize_t bytes; - - count = min_t(ssize_t, count, PAGE_SIZE); - - buf = (char *)__get_free_page(GFP_KERNEL); - if (!buf) - return -ENOMEM; - p = buf; - - mutex_lock(&iommu_debug_lock); - - area = omap_find_iovm_area(dev, (u32)ppos); - if (!area) { - bytes = -EINVAL; - goto err_out; - } - memcpy(p, area->va, count); - p += count; - - bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); -err_out: - mutex_unlock(&iommu_debug_lock); - free_page((unsigned long)buf); - - return bytes; -} - -static ssize_t debug_write_mem(struct file *file, const char __user *userbuf, - size_t count, loff_t *ppos) -{ - struct device *dev = file->private_data; - struct iovm_struct *area; - char *p, *buf; - - count = min_t(size_t, count, PAGE_SIZE); - - buf = (char *)__get_free_page(GFP_KERNEL); - if (!buf) - return -ENOMEM; - p = buf; - - mutex_lock(&iommu_debug_lock); - - if (copy_from_user(p, userbuf, count)) { - count = -EFAULT; - goto err_out; - } - - area = omap_find_iovm_area(dev, (u32)ppos); - if (!area) { - count = -EINVAL; - goto err_out; - } - memcpy(area->va, p, count); -err_out: - mutex_unlock(&iommu_debug_lock); - free_page((unsigned long)buf); - - return count; -} - #define DEBUG_FOPS(name) \ static const struct file_operations debug_##name##_fops = { \ .open = simple_open, \ @@ -342,8 +232,6 @@ DEBUG_FOPS_RO(ver); DEBUG_FOPS_RO(regs); DEBUG_FOPS_RO(tlb); DEBUG_FOPS(pagetable); -DEBUG_FOPS_RO(mmap); -DEBUG_FOPS(mem); #define __DEBUG_ADD_FILE(attr, mode) \ { \ @@ -389,8 +277,6 @@ static int iommu_debug_register(struct device *dev, void *data) DEBUG_ADD_FILE_RO(regs); DEBUG_ADD_FILE_RO(tlb); DEBUG_ADD_FILE(pagetable); - DEBUG_ADD_FILE_RO(mmap); - DEBUG_ADD_FILE(mem); return 0; diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 895af06a667f..61599e2b33ca 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -959,31 +959,18 @@ static int omap_iommu_probe(struct platform_device *pdev) return err; if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8) return -EINVAL; - /* - * da_start and da_end are needed for omap-iovmm, so hardcode - * these values as used by OMAP3 ISP - the only user for - * omap-iovmm - */ - obj->da_start = 0; - obj->da_end = 0xfffff000; if (of_find_property(of, "ti,iommu-bus-err-back", NULL)) obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN; } else { obj->nr_tlb_entries = pdata->nr_tlb_entries; obj->name = pdata->name; - obj->da_start = pdata->da_start; - obj->da_end = pdata->da_end; } - if (obj->da_end <= obj->da_start) - return -EINVAL; obj->dev = &pdev->dev; obj->ctx = (void *)obj + sizeof(*obj); spin_lock_init(&obj->iommu_lock); - mutex_init(&obj->mmap_lock); spin_lock_init(&obj->page_table_lock); - INIT_LIST_HEAD(&obj->mmap); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); obj->regbase = devm_ioremap_resource(obj->dev, res); diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h index ea920c3e94ff..1275a822934b 100644 --- a/drivers/iommu/omap-iommu.h +++ b/drivers/iommu/omap-iommu.h @@ -46,12 +46,7 @@ struct omap_iommu { int nr_tlb_entries; - struct list_head mmap; - struct mutex mmap_lock; /* protect mmap */ - void *ctx; /* iommu context: registres saved area */ - u32 da_start; - u32 da_end; int has_bus_err_back; }; @@ -154,9 +149,12 @@ static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev) #define MMU_RAM_PADDR_MASK \ ((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT) +#define MMU_RAM_ENDIAN_SHIFT 9 #define MMU_RAM_ENDIAN_MASK (1 << MMU_RAM_ENDIAN_SHIFT) +#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT) #define MMU_RAM_ENDIAN_BIG (1 << MMU_RAM_ENDIAN_SHIFT) +#define MMU_RAM_ELSZ_SHIFT 7 #define MMU_RAM_ELSZ_MASK (3 << MMU_RAM_ELSZ_SHIFT) #define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT) #define MMU_RAM_ELSZ_16 (1 << MMU_RAM_ELSZ_SHIFT) diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c deleted file mode 100644 index f583ba049168..000000000000 --- a/drivers/iommu/omap-iovmm.c +++ /dev/null @@ -1,791 +0,0 @@ -/* - * omap iommu: simple virtual address space management - * - * Copyright (C) 2008-2009 Nokia Corporation - * - * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/err.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include <linux/device.h> -#include <linux/scatterlist.h> -#include <linux/iommu.h> -#include <linux/omap-iommu.h> -#include <linux/platform_data/iommu-omap.h> - -#include <asm/cacheflush.h> -#include <asm/mach/map.h> - -#include "omap-iopgtable.h" -#include "omap-iommu.h" - -/* - * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma) - * - * lower 16 bit is used for h/w and upper 16 bit is for s/w. - */ -#define IOVMF_SW_SHIFT 16 - -/* - * iovma: h/w flags derived from cam and ram attribute - */ -#define IOVMF_CAM_MASK (~((1 << 10) - 1)) -#define IOVMF_RAM_MASK (~IOVMF_CAM_MASK) - -#define IOVMF_PGSZ_MASK (3 << 0) -#define IOVMF_PGSZ_1M MMU_CAM_PGSZ_1M -#define IOVMF_PGSZ_64K MMU_CAM_PGSZ_64K -#define IOVMF_PGSZ_4K MMU_CAM_PGSZ_4K -#define IOVMF_PGSZ_16M MMU_CAM_PGSZ_16M - -#define IOVMF_ENDIAN_MASK (1 << 9) -#define IOVMF_ENDIAN_BIG MMU_RAM_ENDIAN_BIG - -#define IOVMF_ELSZ_MASK (3 << 7) -#define IOVMF_ELSZ_16 MMU_RAM_ELSZ_16 -#define IOVMF_ELSZ_32 MMU_RAM_ELSZ_32 -#define IOVMF_ELSZ_NONE MMU_RAM_ELSZ_NONE - -#define IOVMF_MIXED_MASK (1 << 6) -#define IOVMF_MIXED MMU_RAM_MIXED - -/* - * iovma: s/w flags, used for mapping and umapping internally. - */ -#define IOVMF_MMIO (1 << IOVMF_SW_SHIFT) -#define IOVMF_ALLOC (2 << IOVMF_SW_SHIFT) -#define IOVMF_ALLOC_MASK (3 << IOVMF_SW_SHIFT) - -/* "superpages" is supported just with physically linear pages */ -#define IOVMF_DISCONT (1 << (2 + IOVMF_SW_SHIFT)) -#define IOVMF_LINEAR (2 << (2 + IOVMF_SW_SHIFT)) -#define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT)) - -#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT)) - -static struct kmem_cache *iovm_area_cachep; - -/* return the offset of the first scatterlist entry in a sg table */ -static unsigned int sgtable_offset(const struct sg_table *sgt) -{ - if (!sgt || !sgt->nents) - return 0; - - return sgt->sgl->offset; -} - -/* return total bytes of sg buffers */ -static size_t sgtable_len(const struct sg_table *sgt) -{ - unsigned int i, total = 0; - struct scatterlist *sg; - - if (!sgt) - return 0; - - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - size_t bytes; - - bytes = sg->length + sg->offset; - - if (!iopgsz_ok(bytes)) { - pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n", - __func__, i, bytes, sg->offset); - return 0; - } - - if (i && sg->offset) { - pr_err("%s: sg[%d] offset not allowed in internal entries\n", - __func__, i); - return 0; - } - - total += bytes; - } - - return total; -} -#define sgtable_ok(x) (!!sgtable_len(x)) - -static unsigned max_alignment(u32 addr) -{ - int i; - unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, }; - for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++) - ; - return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0; -} - -/* - * calculate the optimal number sg elements from total bytes based on - * iommu superpages - */ -static unsigned sgtable_nents(size_t bytes, u32 da, u32 pa) -{ - unsigned nr_entries = 0, ent_sz; - - if (!PAGE_ALIGNED(bytes)) { - pr_err("%s: wrong size %08x\n", __func__, bytes); - return 0; - } - - while (bytes) { - ent_sz = max_alignment(da | pa); - ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes)); - nr_entries++; - da += ent_sz; - pa += ent_sz; - bytes -= ent_sz; - } - - return nr_entries; -} - -/* allocate and initialize sg_table header(a kind of 'superblock') */ -static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags, - u32 da, u32 pa) -{ - unsigned int nr_entries; - int err; - struct sg_table *sgt; - - if (!bytes) - return ERR_PTR(-EINVAL); - - if (!PAGE_ALIGNED(bytes)) - return ERR_PTR(-EINVAL); - - if (flags & IOVMF_LINEAR) { - nr_entries = sgtable_nents(bytes, da, pa); - if (!nr_entries) - return ERR_PTR(-EINVAL); - } else - nr_entries = bytes / PAGE_SIZE; - - sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); - if (!sgt) - return ERR_PTR(-ENOMEM); - - err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL); - if (err) { - kfree(sgt); - return ERR_PTR(err); - } - - pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries); - - return sgt; -} - -/* free sg_table header(a kind of superblock) */ -static void sgtable_free(struct sg_table *sgt) -{ - if (!sgt) - return; - - sg_free_table(sgt); - kfree(sgt); - - pr_debug("%s: sgt:%p\n", __func__, sgt); -} - -/* map 'sglist' to a contiguous mpu virtual area and return 'va' */ -static void *vmap_sg(const struct sg_table *sgt) -{ - u32 va; - size_t total; - unsigned int i; - struct scatterlist *sg; - struct vm_struct *new; - const struct mem_type *mtype; - - mtype = get_mem_type(MT_DEVICE); - if (!mtype) - return ERR_PTR(-EINVAL); - - total = sgtable_len(sgt); - if (!total) - return ERR_PTR(-EINVAL); - - new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END); - if (!new) - return ERR_PTR(-ENOMEM); - va = (u32)new->addr; - - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - size_t bytes; - u32 pa; - int err; - - pa = sg_phys(sg) - sg->offset; - bytes = sg->length + sg->offset; - - BUG_ON(bytes != PAGE_SIZE); - - err = ioremap_page(va, pa, mtype); - if (err) - goto err_out; - - va += bytes; - } - - flush_cache_vmap((unsigned long)new->addr, - (unsigned long)(new->addr + total)); - return new->addr; - -err_out: - WARN_ON(1); /* FIXME: cleanup some mpu mappings */ - vunmap(new->addr); - return ERR_PTR(-EAGAIN); -} - -static inline void vunmap_sg(const void *va) -{ - vunmap(va); -} - -static struct iovm_struct *__find_iovm_area(struct omap_iommu *obj, - const u32 da) -{ - struct iovm_struct *tmp; - - list_for_each_entry(tmp, &obj->mmap, list) { - if ((da >= tmp->da_start) && (da < tmp->da_end)) { - size_t len; - - len = tmp->da_end - tmp->da_start; - - dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", - __func__, tmp->da_start, da, tmp->da_end, len, - tmp->flags); - - return tmp; - } - } - - return NULL; -} - -/** - * omap_find_iovm_area - find iovma which includes @da - * @dev: client device - * @da: iommu device virtual address - * - * Find the existing iovma starting at @da - */ -struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - struct iovm_struct *area; - - mutex_lock(&obj->mmap_lock); - area = __find_iovm_area(obj, da); - mutex_unlock(&obj->mmap_lock); - - return area; -} -EXPORT_SYMBOL_GPL(omap_find_iovm_area); - -/* - * This finds the hole(area) which fits the requested address and len - * in iovmas mmap, and returns the new allocated iovma. - */ -static struct iovm_struct *alloc_iovm_area(struct omap_iommu *obj, u32 da, - size_t bytes, u32 flags) -{ - struct iovm_struct *new, *tmp; - u32 start, prev_end, alignment; - - if (!obj || !bytes) - return ERR_PTR(-EINVAL); - - start = da; - alignment = PAGE_SIZE; - - if (~flags & IOVMF_DA_FIXED) { - /* Don't map address 0 */ - start = obj->da_start ? obj->da_start : alignment; - - if (flags & IOVMF_LINEAR) - alignment = iopgsz_max(bytes); - start = roundup(start, alignment); - } else if (start < obj->da_start || start > obj->da_end || - obj->da_end - start < bytes) { - return ERR_PTR(-EINVAL); - } - - tmp = NULL; - if (list_empty(&obj->mmap)) - goto found; - - prev_end = 0; - list_for_each_entry(tmp, &obj->mmap, list) { - - if (prev_end > start) - break; - - if (tmp->da_start > start && (tmp->da_start - start) >= bytes) - goto found; - - if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED) - start = roundup(tmp->da_end + 1, alignment); - - prev_end = tmp->da_end; - } - - if ((start >= prev_end) && (obj->da_end - start >= bytes)) - goto found; - - dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n", - __func__, da, bytes, flags); - - return ERR_PTR(-EINVAL); - -found: - new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL); - if (!new) - return ERR_PTR(-ENOMEM); - - new->iommu = obj; - new->da_start = start; - new->da_end = start + bytes; - new->flags = flags; - - /* - * keep ascending order of iovmas - */ - if (tmp) - list_add_tail(&new->list, &tmp->list); - else - list_add(&new->list, &obj->mmap); - - dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n", - __func__, new->da_start, start, new->da_end, bytes, flags); - - return new; -} - -static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area) -{ - size_t bytes; - - BUG_ON(!obj || !area); - - bytes = area->da_end - area->da_start; - - dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n", - __func__, area->da_start, area->da_end, bytes, area->flags); - - list_del(&area->list); - kmem_cache_free(iovm_area_cachep, area); -} - -/** - * omap_da_to_va - convert (d) to (v) - * @dev: client device - * @da: iommu device virtual address - * @va: mpu virtual address - * - * Returns mpu virtual addr which corresponds to a given device virtual addr - */ -void *omap_da_to_va(struct device *dev, u32 da) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - void *va = NULL; - struct iovm_struct *area; - - mutex_lock(&obj->mmap_lock); - - area = __find_iovm_area(obj, da); - if (!area) { - dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); - goto out; - } - va = area->va; -out: - mutex_unlock(&obj->mmap_lock); - - return va; -} -EXPORT_SYMBOL_GPL(omap_da_to_va); - -static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va) -{ - unsigned int i; - struct scatterlist *sg; - void *va = _va; - void *va_end; - - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - struct page *pg; - const size_t bytes = PAGE_SIZE; - - /* - * iommu 'superpage' isn't supported with 'omap_iommu_vmalloc()' - */ - pg = vmalloc_to_page(va); - BUG_ON(!pg); - sg_set_page(sg, pg, bytes, 0); - - va += bytes; - } - - va_end = _va + PAGE_SIZE * i; -} - -static inline void sgtable_drain_vmalloc(struct sg_table *sgt) -{ - /* - * Actually this is not necessary at all, just exists for - * consistency of the code readability. - */ - BUG_ON(!sgt); -} - -/* create 'da' <-> 'pa' mapping from 'sgt' */ -static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new, - const struct sg_table *sgt, u32 flags) -{ - int err; - unsigned int i, j; - struct scatterlist *sg; - u32 da = new->da_start; - - if (!domain || !sgt) - return -EINVAL; - - BUG_ON(!sgtable_ok(sgt)); - - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - u32 pa; - size_t bytes; - - pa = sg_phys(sg) - sg->offset; - bytes = sg->length + sg->offset; - - flags &= ~IOVMF_PGSZ_MASK; - - if (bytes_to_iopgsz(bytes) < 0) - goto err_out; - - pr_debug("%s: [%d] %08x %08x(%x)\n", __func__, - i, da, pa, bytes); - - err = iommu_map(domain, da, pa, bytes, flags); - if (err) - goto err_out; - - da += bytes; - } - return 0; - -err_out: - da = new->da_start; - - for_each_sg(sgt->sgl, sg, i, j) { - size_t bytes; - - bytes = sg->length + sg->offset; - - /* ignore failures.. we're already handling one */ - iommu_unmap(domain, da, bytes); - - da += bytes; - } - return err; -} - -/* release 'da' <-> 'pa' mapping */ -static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj, - struct iovm_struct *area) -{ - u32 start; - size_t total = area->da_end - area->da_start; - const struct sg_table *sgt = area->sgt; - struct scatterlist *sg; - int i; - size_t unmapped; - - BUG_ON(!sgtable_ok(sgt)); - BUG_ON((!total) || !PAGE_ALIGNED(total)); - - start = area->da_start; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - size_t bytes; - - bytes = sg->length + sg->offset; - - unmapped = iommu_unmap(domain, start, bytes); - if (unmapped < bytes) - break; - - dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n", - __func__, start, bytes, area->flags); - - BUG_ON(!PAGE_ALIGNED(bytes)); - - total -= bytes; - start += bytes; - } - BUG_ON(total); -} - -/* template function for all unmapping */ -static struct sg_table *unmap_vm_area(struct iommu_domain *domain, - struct omap_iommu *obj, const u32 da, - void (*fn)(const void *), u32 flags) -{ - struct sg_table *sgt = NULL; - struct iovm_struct *area; - - if (!PAGE_ALIGNED(da)) { - dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da); - return NULL; - } - - mutex_lock(&obj->mmap_lock); - - area = __find_iovm_area(obj, da); - if (!area) { - dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); - goto out; - } - - if ((area->flags & flags) != flags) { - dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__, - area->flags); - goto out; - } - sgt = (struct sg_table *)area->sgt; - - unmap_iovm_area(domain, obj, area); - - fn(area->va); - - dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__, - area->da_start, da, area->da_end, - area->da_end - area->da_start, area->flags); - - free_iovm_area(obj, area); -out: - mutex_unlock(&obj->mmap_lock); - - return sgt; -} - -static u32 map_iommu_region(struct iommu_domain *domain, struct omap_iommu *obj, - u32 da, const struct sg_table *sgt, void *va, - size_t bytes, u32 flags) -{ - int err = -ENOMEM; - struct iovm_struct *new; - - mutex_lock(&obj->mmap_lock); - - new = alloc_iovm_area(obj, da, bytes, flags); - if (IS_ERR(new)) { - err = PTR_ERR(new); - goto err_alloc_iovma; - } - new->va = va; - new->sgt = sgt; - - if (map_iovm_area(domain, new, sgt, new->flags)) - goto err_map; - - mutex_unlock(&obj->mmap_lock); - - dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n", - __func__, new->da_start, bytes, new->flags, va); - - return new->da_start; - -err_map: - free_iovm_area(obj, new); -err_alloc_iovma: - mutex_unlock(&obj->mmap_lock); - return err; -} - -static inline u32 -__iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj, - u32 da, const struct sg_table *sgt, - void *va, size_t bytes, u32 flags) -{ - return map_iommu_region(domain, obj, da, sgt, va, bytes, flags); -} - -/** - * omap_iommu_vmap - (d)-(p)-(v) address mapper - * @domain: iommu domain - * @dev: client device - * @sgt: address of scatter gather table - * @flags: iovma and page property - * - * Creates 1-n-1 mapping with given @sgt and returns @da. - * All @sgt element must be io page size aligned. - */ -u32 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da, - const struct sg_table *sgt, u32 flags) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - size_t bytes; - void *va = NULL; - - if (!obj || !obj->dev || !sgt) - return -EINVAL; - - bytes = sgtable_len(sgt); - if (!bytes) - return -EINVAL; - bytes = PAGE_ALIGN(bytes); - - if (flags & IOVMF_MMIO) { - va = vmap_sg(sgt); - if (IS_ERR(va)) - return PTR_ERR(va); - } - - flags |= IOVMF_DISCONT; - flags |= IOVMF_MMIO; - - da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags); - if (IS_ERR_VALUE(da)) - vunmap_sg(va); - - return da + sgtable_offset(sgt); -} -EXPORT_SYMBOL_GPL(omap_iommu_vmap); - -/** - * omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()' - * @domain: iommu domain - * @dev: client device - * @da: iommu device virtual address - * - * Free the iommu virtually contiguous memory area starting at - * @da, which was returned by 'omap_iommu_vmap()'. - */ -struct sg_table * -omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - struct sg_table *sgt; - /* - * 'sgt' is allocated before 'omap_iommu_vmalloc()' is called. - * Just returns 'sgt' to the caller to free - */ - da &= PAGE_MASK; - sgt = unmap_vm_area(domain, obj, da, vunmap_sg, - IOVMF_DISCONT | IOVMF_MMIO); - if (!sgt) - dev_dbg(obj->dev, "%s: No sgt\n", __func__); - return sgt; -} -EXPORT_SYMBOL_GPL(omap_iommu_vunmap); - -/** - * omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper - * @dev: client device - * @da: contiguous iommu virtual memory - * @bytes: allocation size - * @flags: iovma and page property - * - * Allocate @bytes linearly and creates 1-n-1 mapping and returns - * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set. - */ -u32 -omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da, - size_t bytes, u32 flags) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - void *va; - struct sg_table *sgt; - - if (!obj || !obj->dev || !bytes) - return -EINVAL; - - bytes = PAGE_ALIGN(bytes); - - va = vmalloc(bytes); - if (!va) - return -ENOMEM; - - flags |= IOVMF_DISCONT; - flags |= IOVMF_ALLOC; - - sgt = sgtable_alloc(bytes, flags, da, 0); - if (IS_ERR(sgt)) { - da = PTR_ERR(sgt); - goto err_sgt_alloc; - } - sgtable_fill_vmalloc(sgt, va); - - da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags); - if (IS_ERR_VALUE(da)) - goto err_iommu_vmap; - - return da; - -err_iommu_vmap: - sgtable_drain_vmalloc(sgt); - sgtable_free(sgt); -err_sgt_alloc: - vfree(va); - return da; -} -EXPORT_SYMBOL_GPL(omap_iommu_vmalloc); - -/** - * omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()' - * @dev: client device - * @da: iommu device virtual address - * - * Frees the iommu virtually continuous memory area starting at - * @da, as obtained from 'omap_iommu_vmalloc()'. - */ -void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev, - const u32 da) -{ - struct omap_iommu *obj = dev_to_omap_iommu(dev); - struct sg_table *sgt; - - sgt = unmap_vm_area(domain, obj, da, vfree, - IOVMF_DISCONT | IOVMF_ALLOC); - if (!sgt) - dev_dbg(obj->dev, "%s: No sgt\n", __func__); - sgtable_free(sgt); -} -EXPORT_SYMBOL_GPL(omap_iommu_vfree); - -static int __init iovmm_init(void) -{ - const unsigned long flags = SLAB_HWCACHE_ALIGN; - struct kmem_cache *p; - - p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0, - flags, NULL); - if (!p) - return -ENOMEM; - iovm_area_cachep = p; - - return 0; -} -module_init(iovmm_init); - -static void __exit iovmm_exit(void) -{ - kmem_cache_destroy(iovm_area_cachep); -} -module_exit(iovmm_exit); - -MODULE_DESCRIPTION("omap iommu: simple virtual address space management"); -MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); -MODULE_LICENSE("GPL v2"); |
