OpenCloudOS-Kernel/arch/arm/plat-omap/iovmm.c

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/*
* 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/err.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#include <asm/mach/map.h>
#include <plat/iommu.h>
#include <plat/iovmm.h>
#include "iopgtable.h"
/*
* A device driver needs to create address mappings between:
*
* - iommu/device address
* - physical address
* - mpu virtual address
*
* There are 4 possible patterns for them:
*
* |iova/ mapping iommu_ page
* | da pa va (d)-(p)-(v) function type
* ---------------------------------------------------------------------------
* 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
* 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
* 3 | c d c 1 - n - 1 _vmap() / _vunmap() s
* 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
*
*
* 'iova': device iommu virtual address
* 'da': alias of 'iova'
* 'pa': physical address
* 'va': mpu virtual address
*
* 'c': contiguous memory area
* 'd': discontiguous memory area
* 'a': anonymous memory allocation
* '()': optional feature
*
* 'n': a normal page(4KB) size is used.
* 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
*
* '*': not yet, but feasible.
*/
static struct kmem_cache *iovm_area_cachep;
/* 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_dma_len(sg);
if (!iopgsz_ok(bytes)) {
pr_err("%s: sg[%d] not iommu pagesize(%x)\n",
__func__, i, bytes);
return 0;
}
total += bytes;
}
return total;
}
#define sgtable_ok(x) (!!sgtable_len(x))
/*
* calculate the optimal number sg elements from total bytes based on
* iommu superpages
*/
static unsigned int sgtable_nents(size_t bytes)
{
int i;
unsigned int nr_entries;
const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
if (!IS_ALIGNED(bytes, PAGE_SIZE)) {
pr_err("%s: wrong size %08x\n", __func__, bytes);
return 0;
}
nr_entries = 0;
for (i = 0; i < ARRAY_SIZE(pagesize); i++) {
if (bytes >= pagesize[i]) {
nr_entries += (bytes / pagesize[i]);
bytes %= pagesize[i];
}
}
BUG_ON(bytes);
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)
{
unsigned int nr_entries;
int err;
struct sg_table *sgt;
if (!bytes)
return ERR_PTR(-EINVAL);
if (!IS_ALIGNED(bytes, PAGE_SIZE))
return ERR_PTR(-EINVAL);
/* FIXME: IOVMF_DA_FIXED should support 'superpages' */
if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) {
nr_entries = sgtable_nents(bytes);
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)
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);
bytes = sg_dma_len(sg);
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 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;
}
/**
* find_iovm_area - find iovma which includes @da
* @da: iommu device virtual address
*
* Find the existing iovma starting at @da
*/
struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da)
{
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(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 iommu *obj, u32 da,
size_t bytes, u32 flags)
{
struct iovm_struct *new, *tmp;
u32 start, prev_end, alignement;
if (!obj || !bytes)
return ERR_PTR(-EINVAL);
start = da;
alignement = PAGE_SIZE;
if (flags & IOVMF_DA_ANON) {
/*
* Reserve the first page for NULL
*/
start = PAGE_SIZE;
if (flags & IOVMF_LINEAR)
alignement = iopgsz_max(bytes);
start = roundup(start, alignement);
}
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 (start + bytes < tmp->da_start)
goto found;
if (flags & IOVMF_DA_ANON)
start = roundup(tmp->da_end + 1, alignement);
prev_end = tmp->da_end;
}
if ((start > prev_end) && (ULONG_MAX - 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 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);
}
/**
* da_to_va - convert (d) to (v)
* @obj: objective iommu
* @da: iommu device virtual address
* @va: mpu virtual address
*
* Returns mpu virtual addr which corresponds to a given device virtual addr
*/
void *da_to_va(struct iommu *obj, u32 da)
{
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(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 '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);
}
static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
{
unsigned int i;
struct scatterlist *sg;
void *va;
va = phys_to_virt(pa);
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes;
bytes = iopgsz_max(len);
BUG_ON(!iopgsz_ok(bytes));
sg_set_buf(sg, phys_to_virt(pa), bytes);
/*
* 'pa' is cotinuous(linear).
*/
pa += bytes;
len -= bytes;
}
BUG_ON(len);
}
static inline void sgtable_drain_kmalloc(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 *obj, 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 (!obj || !sgt)
return -EINVAL;
BUG_ON(!sgtable_ok(sgt));
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
u32 pa;
int pgsz;
size_t bytes;
struct iotlb_entry e;
pa = sg_phys(sg);
bytes = sg_dma_len(sg);
flags &= ~IOVMF_PGSZ_MASK;
pgsz = bytes_to_iopgsz(bytes);
if (pgsz < 0)
goto err_out;
flags |= pgsz;
pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
i, da, pa, bytes);
iotlb_init_entry(&e, da, pa, flags);
err = iopgtable_store_entry(obj, &e);
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 = iopgtable_clear_entry(obj, da);
BUG_ON(!iopgsz_ok(bytes));
da += bytes;
}
return err;
}
/* release 'da' <-> 'pa' mapping */
static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area)
{
u32 start;
size_t total = area->da_end - area->da_start;
BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
start = area->da_start;
while (total > 0) {
size_t bytes;
bytes = iopgtable_clear_entry(obj, start);
if (bytes == 0)
bytes = PAGE_SIZE;
else
dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
__func__, start, bytes, area->flags);
BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
total -= bytes;
start += bytes;
}
BUG_ON(total);
}
/* template function for all unmapping */
static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da,
void (*fn)(const void *), u32 flags)
{
struct sg_table *sgt = NULL;
struct iovm_struct *area;
if (!IS_ALIGNED(da, PAGE_SIZE)) {
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(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 *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(obj, 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 *obj, u32 da,
const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
{
return map_iommu_region(obj, da, sgt, va, bytes, flags);
}
/**
* iommu_vmap - (d)-(p)-(v) address mapper
* @obj: objective iommu
* @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 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt,
u32 flags)
{
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_HW_MASK;
flags |= IOVMF_DISCONT;
flags |= IOVMF_MMIO;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da))
vunmap_sg(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_vmap);
/**
* iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Free the iommu virtually contiguous memory area starting at
* @da, which was returned by 'iommu_vmap()'.
*/
struct sg_table *iommu_vunmap(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
/*
* 'sgt' is allocated before 'iommu_vmalloc()' is called.
* Just returns 'sgt' to the caller to free
*/
sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
return sgt;
}
EXPORT_SYMBOL_GPL(iommu_vunmap);
/**
* iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
* @obj: objective iommu
* @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_ANON' is set.
*/
u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
{
void *va;
struct sg_table *sgt;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = vmalloc(bytes);
if (!va)
return -ENOMEM;
sgt = sgtable_alloc(bytes, flags);
if (IS_ERR(sgt)) {
da = PTR_ERR(sgt);
goto err_sgt_alloc;
}
sgtable_fill_vmalloc(sgt, va);
flags &= IOVMF_HW_MASK;
flags |= IOVMF_DISCONT;
flags |= IOVMF_ALLOC;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_vmap(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(iommu_vmalloc);
/**
* iommu_vfree - release memory allocated by 'iommu_vmalloc()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually continuous memory area starting at
* @da, as obtained from 'iommu_vmalloc()'.
*/
void iommu_vfree(struct iommu *obj, const u32 da)
{
struct sg_table *sgt;
sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_vfree);
static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va,
size_t bytes, u32 flags)
{
struct sg_table *sgt;
sgt = sgtable_alloc(bytes, flags);
if (IS_ERR(sgt))
return PTR_ERR(sgt);
sgtable_fill_kmalloc(sgt, pa, bytes);
da = map_iommu_region(obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da)) {
sgtable_drain_kmalloc(sgt);
sgtable_free(sgt);
}
return da;
}
/**
* iommu_kmap - (d)-(p)-(v) address mapper
* @obj: objective iommu
* @da: contiguous iommu virtual memory
* @pa: contiguous physical memory
* @flags: iovma and page property
*
* Creates 1-1-1 mapping and returns @da again, which can be
* adjusted if 'IOVMF_DA_ANON' is set.
*/
u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
u32 flags)
{
void *va;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = ioremap(pa, bytes);
if (!va)
return -ENOMEM;
flags &= IOVMF_HW_MASK;
flags |= IOVMF_LINEAR;
flags |= IOVMF_MMIO;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
if (IS_ERR_VALUE(da))
iounmap(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_kmap);
/**
* iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually contiguous memory area starting at
* @da, which was passed to and was returned by'iommu_kmap()'.
*/
void iommu_kunmap(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
typedef void (*func_t)(const void *);
sgt = unmap_vm_area(obj, da, (func_t)__iounmap,
IOVMF_LINEAR | IOVMF_MMIO);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_kunmap);
/**
* iommu_kmalloc - (d)-(p)-(v) address allocator and mapper
* @obj: objective iommu
* @da: contiguous iommu virtual memory
* @bytes: bytes for allocation
* @flags: iovma and page property
*
* Allocate @bytes linearly and creates 1-1-1 mapping and returns
* @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
*/
u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
{
void *va;
u32 pa;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = kmalloc(bytes, GFP_KERNEL | GFP_DMA);
if (!va)
return -ENOMEM;
pa = virt_to_phys(va);
flags &= IOVMF_HW_MASK;
flags |= IOVMF_LINEAR;
flags |= IOVMF_ALLOC;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
if (IS_ERR_VALUE(da))
kfree(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_kmalloc);
/**
* iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually contiguous memory area starting at
* @da, which was passed to and was returned by'iommu_kmalloc()'.
*/
void iommu_kfree(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_kfree);
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");