mirror of https://gitee.com/openkylin/linux.git
Merge branch 'pending-dma-coherent' into devel
This commit is contained in:
Russell King
commit
c6baa1963c
|
|
@ -304,13 +304,23 @@ PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG);
|
|||
|
||||
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
|
||||
|
||||
#define __pgprot_modify(prot,mask,bits) \
|
||||
__pgprot((pgprot_val(prot) & ~(mask)) | (bits))
|
||||
|
||||
/*
|
||||
* Mark the prot value as uncacheable and unbufferable.
|
||||
*/
|
||||
#define pgprot_noncached(prot) \
|
||||
__pgprot((pgprot_val(prot) & ~L_PTE_MT_MASK) | L_PTE_MT_UNCACHED)
|
||||
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED)
|
||||
#define pgprot_writecombine(prot) \
|
||||
__pgprot((pgprot_val(prot) & ~L_PTE_MT_MASK) | L_PTE_MT_BUFFERABLE)
|
||||
__pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE)
|
||||
#if __LINUX_ARM_ARCH__ >= 7
|
||||
#define pgprot_dmacoherent(prot) \
|
||||
__pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE)
|
||||
#else
|
||||
#define pgprot_dmacoherent(prot) \
|
||||
__pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED)
|
||||
#endif
|
||||
|
||||
#define pmd_none(pmd) (!pmd_val(pmd))
|
||||
#define pmd_present(pmd) (pmd_val(pmd))
|
||||
|
|
|
|||
|
|
@ -138,21 +138,26 @@ extern unsigned int user_debug;
|
|||
#define dmb() __asm__ __volatile__ ("" : : : "memory")
|
||||
#endif
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
#if __LINUX_ARM_ARCH__ >= 7 || defined(CONFIG_SMP)
|
||||
#define mb() dmb()
|
||||
#define rmb() dmb()
|
||||
#define wmb() dmb()
|
||||
#else
|
||||
#define mb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
|
||||
#define rmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
|
||||
#define wmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
|
||||
#endif
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
#define smp_mb() barrier()
|
||||
#define smp_rmb() barrier()
|
||||
#define smp_wmb() barrier()
|
||||
#else
|
||||
#define mb() dmb()
|
||||
#define rmb() dmb()
|
||||
#define wmb() dmb()
|
||||
#define smp_mb() dmb()
|
||||
#define smp_rmb() dmb()
|
||||
#define smp_wmb() dmb()
|
||||
#define smp_mb() mb()
|
||||
#define smp_rmb() rmb()
|
||||
#define smp_wmb() wmb()
|
||||
#endif
|
||||
|
||||
#define read_barrier_depends() do { } while(0)
|
||||
#define smp_read_barrier_depends() do { } while(0)
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ obj-y := dma-mapping.o extable.o fault.o init.o \
|
|||
iomap.o
|
||||
|
||||
obj-$(CONFIG_MMU) += fault-armv.o flush.o ioremap.o mmap.o \
|
||||
pgd.o mmu.o
|
||||
pgd.o mmu.o vmregion.o
|
||||
|
||||
ifneq ($(CONFIG_MMU),y)
|
||||
obj-y += nommu.o
|
||||
|
|
|
|||
|
|
@ -63,435 +63,86 @@ static u64 get_coherent_dma_mask(struct device *dev)
|
|||
return mask;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MMU
|
||||
/*
|
||||
* These are the page tables (2MB each) covering uncached, DMA consistent allocations
|
||||
* Allocate a DMA buffer for 'dev' of size 'size' using the
|
||||
* specified gfp mask. Note that 'size' must be page aligned.
|
||||
*/
|
||||
static pte_t *consistent_pte[NUM_CONSISTENT_PTES];
|
||||
static DEFINE_SPINLOCK(consistent_lock);
|
||||
|
||||
/*
|
||||
* VM region handling support.
|
||||
*
|
||||
* This should become something generic, handling VM region allocations for
|
||||
* vmalloc and similar (ioremap, module space, etc).
|
||||
*
|
||||
* I envisage vmalloc()'s supporting vm_struct becoming:
|
||||
*
|
||||
* struct vm_struct {
|
||||
* struct vm_region region;
|
||||
* unsigned long flags;
|
||||
* struct page **pages;
|
||||
* unsigned int nr_pages;
|
||||
* unsigned long phys_addr;
|
||||
* };
|
||||
*
|
||||
* get_vm_area() would then call vm_region_alloc with an appropriate
|
||||
* struct vm_region head (eg):
|
||||
*
|
||||
* struct vm_region vmalloc_head = {
|
||||
* .vm_list = LIST_HEAD_INIT(vmalloc_head.vm_list),
|
||||
* .vm_start = VMALLOC_START,
|
||||
* .vm_end = VMALLOC_END,
|
||||
* };
|
||||
*
|
||||
* However, vmalloc_head.vm_start is variable (typically, it is dependent on
|
||||
* the amount of RAM found at boot time.) I would imagine that get_vm_area()
|
||||
* would have to initialise this each time prior to calling vm_region_alloc().
|
||||
*/
|
||||
struct arm_vm_region {
|
||||
struct list_head vm_list;
|
||||
unsigned long vm_start;
|
||||
unsigned long vm_end;
|
||||
struct page *vm_pages;
|
||||
int vm_active;
|
||||
};
|
||||
|
||||
static struct arm_vm_region consistent_head = {
|
||||
.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
|
||||
.vm_start = CONSISTENT_BASE,
|
||||
.vm_end = CONSISTENT_END,
|
||||
};
|
||||
|
||||
static struct arm_vm_region *
|
||||
arm_vm_region_alloc(struct arm_vm_region *head, size_t size, gfp_t gfp)
|
||||
static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp)
|
||||
{
|
||||
unsigned long addr = head->vm_start, end = head->vm_end - size;
|
||||
unsigned long flags;
|
||||
struct arm_vm_region *c, *new;
|
||||
|
||||
new = kmalloc(sizeof(struct arm_vm_region), gfp);
|
||||
if (!new)
|
||||
goto out;
|
||||
|
||||
spin_lock_irqsave(&consistent_lock, flags);
|
||||
|
||||
list_for_each_entry(c, &head->vm_list, vm_list) {
|
||||
if ((addr + size) < addr)
|
||||
goto nospc;
|
||||
if ((addr + size) <= c->vm_start)
|
||||
goto found;
|
||||
addr = c->vm_end;
|
||||
if (addr > end)
|
||||
goto nospc;
|
||||
}
|
||||
|
||||
found:
|
||||
/*
|
||||
* Insert this entry _before_ the one we found.
|
||||
*/
|
||||
list_add_tail(&new->vm_list, &c->vm_list);
|
||||
new->vm_start = addr;
|
||||
new->vm_end = addr + size;
|
||||
new->vm_active = 1;
|
||||
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
return new;
|
||||
|
||||
nospc:
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
kfree(new);
|
||||
out:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static struct arm_vm_region *arm_vm_region_find(struct arm_vm_region *head, unsigned long addr)
|
||||
{
|
||||
struct arm_vm_region *c;
|
||||
|
||||
list_for_each_entry(c, &head->vm_list, vm_list) {
|
||||
if (c->vm_active && c->vm_start == addr)
|
||||
goto out;
|
||||
}
|
||||
c = NULL;
|
||||
out:
|
||||
return c;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_HUGETLB_PAGE
|
||||
#error ARM Coherent DMA allocator does not (yet) support huge TLB
|
||||
#endif
|
||||
|
||||
static void *
|
||||
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
|
||||
pgprot_t prot)
|
||||
{
|
||||
struct page *page;
|
||||
struct arm_vm_region *c;
|
||||
unsigned long order;
|
||||
unsigned long order = get_order(size);
|
||||
struct page *page, *p, *e;
|
||||
void *ptr;
|
||||
u64 mask = get_coherent_dma_mask(dev);
|
||||
u64 limit;
|
||||
|
||||
if (!consistent_pte[0]) {
|
||||
printk(KERN_ERR "%s: not initialised\n", __func__);
|
||||
dump_stack();
|
||||
#ifdef CONFIG_DMA_API_DEBUG
|
||||
u64 limit = (mask + 1) & ~mask;
|
||||
if (limit && size >= limit) {
|
||||
dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n",
|
||||
size, mask);
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (!mask)
|
||||
goto no_page;
|
||||
|
||||
/*
|
||||
* Sanity check the allocation size.
|
||||
*/
|
||||
size = PAGE_ALIGN(size);
|
||||
limit = (mask + 1) & ~mask;
|
||||
if ((limit && size >= limit) ||
|
||||
size >= (CONSISTENT_END - CONSISTENT_BASE)) {
|
||||
printk(KERN_WARNING "coherent allocation too big "
|
||||
"(requested %#x mask %#llx)\n", size, mask);
|
||||
goto no_page;
|
||||
}
|
||||
|
||||
order = get_order(size);
|
||||
return NULL;
|
||||
|
||||
if (mask < 0xffffffffULL)
|
||||
gfp |= GFP_DMA;
|
||||
|
||||
page = alloc_pages(gfp, order);
|
||||
if (!page)
|
||||
goto no_page;
|
||||
return NULL;
|
||||
|
||||
/*
|
||||
* Invalidate any data that might be lurking in the
|
||||
* kernel direct-mapped region for device DMA.
|
||||
* Now split the huge page and free the excess pages
|
||||
*/
|
||||
{
|
||||
void *ptr = page_address(page);
|
||||
memset(ptr, 0, size);
|
||||
dmac_flush_range(ptr, ptr + size);
|
||||
outer_flush_range(__pa(ptr), __pa(ptr) + size);
|
||||
}
|
||||
split_page(page, order);
|
||||
for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++)
|
||||
__free_page(p);
|
||||
|
||||
/*
|
||||
* Allocate a virtual address in the consistent mapping region.
|
||||
* Ensure that the allocated pages are zeroed, and that any data
|
||||
* lurking in the kernel direct-mapped region is invalidated.
|
||||
*/
|
||||
c = arm_vm_region_alloc(&consistent_head, size,
|
||||
gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
|
||||
if (c) {
|
||||
pte_t *pte;
|
||||
struct page *end = page + (1 << order);
|
||||
int idx = CONSISTENT_PTE_INDEX(c->vm_start);
|
||||
u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
|
||||
ptr = page_address(page);
|
||||
memset(ptr, 0, size);
|
||||
dmac_flush_range(ptr, ptr + size);
|
||||
outer_flush_range(__pa(ptr), __pa(ptr) + size);
|
||||
|
||||
pte = consistent_pte[idx] + off;
|
||||
c->vm_pages = page;
|
||||
|
||||
split_page(page, order);
|
||||
|
||||
/*
|
||||
* Set the "dma handle"
|
||||
*/
|
||||
*handle = page_to_dma(dev, page);
|
||||
|
||||
do {
|
||||
BUG_ON(!pte_none(*pte));
|
||||
|
||||
/*
|
||||
* x86 does not mark the pages reserved...
|
||||
*/
|
||||
SetPageReserved(page);
|
||||
set_pte_ext(pte, mk_pte(page, prot), 0);
|
||||
page++;
|
||||
pte++;
|
||||
off++;
|
||||
if (off >= PTRS_PER_PTE) {
|
||||
off = 0;
|
||||
pte = consistent_pte[++idx];
|
||||
}
|
||||
} while (size -= PAGE_SIZE);
|
||||
|
||||
/*
|
||||
* Free the otherwise unused pages.
|
||||
*/
|
||||
while (page < end) {
|
||||
__free_page(page);
|
||||
page++;
|
||||
}
|
||||
|
||||
return (void *)c->vm_start;
|
||||
}
|
||||
|
||||
if (page)
|
||||
__free_pages(page, order);
|
||||
no_page:
|
||||
*handle = ~0;
|
||||
return NULL;
|
||||
return page;
|
||||
}
|
||||
#else /* !CONFIG_MMU */
|
||||
static void *
|
||||
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
|
||||
pgprot_t prot)
|
||||
{
|
||||
void *virt;
|
||||
u64 mask = get_coherent_dma_mask(dev);
|
||||
|
||||
if (!mask)
|
||||
goto error;
|
||||
|
||||
if (mask < 0xffffffffULL)
|
||||
gfp |= GFP_DMA;
|
||||
virt = kmalloc(size, gfp);
|
||||
if (!virt)
|
||||
goto error;
|
||||
|
||||
*handle = virt_to_dma(dev, virt);
|
||||
return virt;
|
||||
|
||||
error:
|
||||
*handle = ~0;
|
||||
return NULL;
|
||||
}
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
/*
|
||||
* Allocate DMA-coherent memory space and return both the kernel remapped
|
||||
* virtual and bus address for that space.
|
||||
* Free a DMA buffer. 'size' must be page aligned.
|
||||
*/
|
||||
void *
|
||||
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
|
||||
static void __dma_free_buffer(struct page *page, size_t size)
|
||||
{
|
||||
void *memory;
|
||||
struct page *e = page + (size >> PAGE_SHIFT);
|
||||
|
||||
if (dma_alloc_from_coherent(dev, size, handle, &memory))
|
||||
return memory;
|
||||
|
||||
if (arch_is_coherent()) {
|
||||
void *virt;
|
||||
|
||||
virt = kmalloc(size, gfp);
|
||||
if (!virt)
|
||||
return NULL;
|
||||
*handle = virt_to_dma(dev, virt);
|
||||
|
||||
return virt;
|
||||
while (page < e) {
|
||||
__free_page(page);
|
||||
page++;
|
||||
}
|
||||
|
||||
return __dma_alloc(dev, size, handle, gfp,
|
||||
pgprot_noncached(pgprot_kernel));
|
||||
}
|
||||
EXPORT_SYMBOL(dma_alloc_coherent);
|
||||
|
||||
/*
|
||||
* Allocate a writecombining region, in much the same way as
|
||||
* dma_alloc_coherent above.
|
||||
*/
|
||||
void *
|
||||
dma_alloc_writecombine(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
|
||||
{
|
||||
return __dma_alloc(dev, size, handle, gfp,
|
||||
pgprot_writecombine(pgprot_kernel));
|
||||
}
|
||||
EXPORT_SYMBOL(dma_alloc_writecombine);
|
||||
|
||||
static int dma_mmap(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
int ret = -ENXIO;
|
||||
#ifdef CONFIG_MMU
|
||||
unsigned long flags, user_size, kern_size;
|
||||
struct arm_vm_region *c;
|
||||
|
||||
user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
|
||||
|
||||
spin_lock_irqsave(&consistent_lock, flags);
|
||||
c = arm_vm_region_find(&consistent_head, (unsigned long)cpu_addr);
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
|
||||
if (c) {
|
||||
unsigned long off = vma->vm_pgoff;
|
||||
|
||||
kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT;
|
||||
|
||||
if (off < kern_size &&
|
||||
user_size <= (kern_size - off)) {
|
||||
ret = remap_pfn_range(vma, vma->vm_start,
|
||||
page_to_pfn(c->vm_pages) + off,
|
||||
user_size << PAGE_SHIFT,
|
||||
vma->vm_page_prot);
|
||||
}
|
||||
}
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
||||
return dma_mmap(dev, vma, cpu_addr, dma_addr, size);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_mmap_coherent);
|
||||
|
||||
int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
|
||||
return dma_mmap(dev, vma, cpu_addr, dma_addr, size);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_mmap_writecombine);
|
||||
|
||||
/*
|
||||
* free a page as defined by the above mapping.
|
||||
* Must not be called with IRQs disabled.
|
||||
* These are the page tables (2MB each) covering uncached, DMA consistent allocations
|
||||
*/
|
||||
#ifdef CONFIG_MMU
|
||||
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
|
||||
{
|
||||
struct arm_vm_region *c;
|
||||
unsigned long flags, addr;
|
||||
pte_t *ptep;
|
||||
int idx;
|
||||
u32 off;
|
||||
static pte_t *consistent_pte[NUM_CONSISTENT_PTES];
|
||||
|
||||
WARN_ON(irqs_disabled());
|
||||
#include "vmregion.h"
|
||||
|
||||
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
|
||||
return;
|
||||
static struct arm_vmregion_head consistent_head = {
|
||||
.vm_lock = __SPIN_LOCK_UNLOCKED(&consistent_head.vm_lock),
|
||||
.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
|
||||
.vm_start = CONSISTENT_BASE,
|
||||
.vm_end = CONSISTENT_END,
|
||||
};
|
||||
|
||||
if (arch_is_coherent()) {
|
||||
kfree(cpu_addr);
|
||||
return;
|
||||
}
|
||||
|
||||
size = PAGE_ALIGN(size);
|
||||
|
||||
spin_lock_irqsave(&consistent_lock, flags);
|
||||
c = arm_vm_region_find(&consistent_head, (unsigned long)cpu_addr);
|
||||
if (!c)
|
||||
goto no_area;
|
||||
|
||||
c->vm_active = 0;
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
|
||||
if ((c->vm_end - c->vm_start) != size) {
|
||||
printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
|
||||
__func__, c->vm_end - c->vm_start, size);
|
||||
dump_stack();
|
||||
size = c->vm_end - c->vm_start;
|
||||
}
|
||||
|
||||
idx = CONSISTENT_PTE_INDEX(c->vm_start);
|
||||
off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
|
||||
ptep = consistent_pte[idx] + off;
|
||||
addr = c->vm_start;
|
||||
do {
|
||||
pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
|
||||
unsigned long pfn;
|
||||
|
||||
ptep++;
|
||||
addr += PAGE_SIZE;
|
||||
off++;
|
||||
if (off >= PTRS_PER_PTE) {
|
||||
off = 0;
|
||||
ptep = consistent_pte[++idx];
|
||||
}
|
||||
|
||||
if (!pte_none(pte) && pte_present(pte)) {
|
||||
pfn = pte_pfn(pte);
|
||||
|
||||
if (pfn_valid(pfn)) {
|
||||
struct page *page = pfn_to_page(pfn);
|
||||
|
||||
/*
|
||||
* x86 does not mark the pages reserved...
|
||||
*/
|
||||
ClearPageReserved(page);
|
||||
|
||||
__free_page(page);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
printk(KERN_CRIT "%s: bad page in kernel page table\n",
|
||||
__func__);
|
||||
} while (size -= PAGE_SIZE);
|
||||
|
||||
flush_tlb_kernel_range(c->vm_start, c->vm_end);
|
||||
|
||||
spin_lock_irqsave(&consistent_lock, flags);
|
||||
list_del(&c->vm_list);
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
|
||||
kfree(c);
|
||||
return;
|
||||
|
||||
no_area:
|
||||
spin_unlock_irqrestore(&consistent_lock, flags);
|
||||
printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n",
|
||||
__func__, cpu_addr);
|
||||
dump_stack();
|
||||
}
|
||||
#else /* !CONFIG_MMU */
|
||||
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
|
||||
{
|
||||
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
|
||||
return;
|
||||
kfree(cpu_addr);
|
||||
}
|
||||
#endif /* CONFIG_MMU */
|
||||
EXPORT_SYMBOL(dma_free_coherent);
|
||||
#ifdef CONFIG_HUGETLB_PAGE
|
||||
#error ARM Coherent DMA allocator does not (yet) support huge TLB
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Initialise the consistent memory allocation.
|
||||
|
|
@ -499,7 +150,6 @@ EXPORT_SYMBOL(dma_free_coherent);
|
|||
static int __init consistent_init(void)
|
||||
{
|
||||
int ret = 0;
|
||||
#ifdef CONFIG_MMU
|
||||
pgd_t *pgd;
|
||||
pmd_t *pmd;
|
||||
pte_t *pte;
|
||||
|
|
@ -526,13 +176,228 @@ static int __init consistent_init(void)
|
|||
consistent_pte[i++] = pte;
|
||||
base += (1 << PGDIR_SHIFT);
|
||||
} while (base < CONSISTENT_END);
|
||||
#endif /* !CONFIG_MMU */
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
core_initcall(consistent_init);
|
||||
|
||||
static void *
|
||||
__dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
|
||||
if (!consistent_pte[0]) {
|
||||
printk(KERN_ERR "%s: not initialised\n", __func__);
|
||||
dump_stack();
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate a virtual address in the consistent mapping region.
|
||||
*/
|
||||
c = arm_vmregion_alloc(&consistent_head, size,
|
||||
gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
|
||||
if (c) {
|
||||
pte_t *pte;
|
||||
int idx = CONSISTENT_PTE_INDEX(c->vm_start);
|
||||
u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
|
||||
|
||||
pte = consistent_pte[idx] + off;
|
||||
c->vm_pages = page;
|
||||
|
||||
do {
|
||||
BUG_ON(!pte_none(*pte));
|
||||
|
||||
set_pte_ext(pte, mk_pte(page, prot), 0);
|
||||
page++;
|
||||
pte++;
|
||||
off++;
|
||||
if (off >= PTRS_PER_PTE) {
|
||||
off = 0;
|
||||
pte = consistent_pte[++idx];
|
||||
}
|
||||
} while (size -= PAGE_SIZE);
|
||||
|
||||
return (void *)c->vm_start;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void __dma_free_remap(void *cpu_addr, size_t size)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
unsigned long addr;
|
||||
pte_t *ptep;
|
||||
int idx;
|
||||
u32 off;
|
||||
|
||||
c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr);
|
||||
if (!c) {
|
||||
printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n",
|
||||
__func__, cpu_addr);
|
||||
dump_stack();
|
||||
return;
|
||||
}
|
||||
|
||||
if ((c->vm_end - c->vm_start) != size) {
|
||||
printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
|
||||
__func__, c->vm_end - c->vm_start, size);
|
||||
dump_stack();
|
||||
size = c->vm_end - c->vm_start;
|
||||
}
|
||||
|
||||
idx = CONSISTENT_PTE_INDEX(c->vm_start);
|
||||
off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
|
||||
ptep = consistent_pte[idx] + off;
|
||||
addr = c->vm_start;
|
||||
do {
|
||||
pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
|
||||
|
||||
ptep++;
|
||||
addr += PAGE_SIZE;
|
||||
off++;
|
||||
if (off >= PTRS_PER_PTE) {
|
||||
off = 0;
|
||||
ptep = consistent_pte[++idx];
|
||||
}
|
||||
|
||||
if (pte_none(pte) || !pte_present(pte))
|
||||
printk(KERN_CRIT "%s: bad page in kernel page table\n",
|
||||
__func__);
|
||||
} while (size -= PAGE_SIZE);
|
||||
|
||||
flush_tlb_kernel_range(c->vm_start, c->vm_end);
|
||||
|
||||
arm_vmregion_free(&consistent_head, c);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_MMU */
|
||||
|
||||
#define __dma_alloc_remap(page, size, gfp, prot) page_address(page)
|
||||
#define __dma_free_remap(addr, size) do { } while (0)
|
||||
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
static void *
|
||||
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
|
||||
pgprot_t prot)
|
||||
{
|
||||
struct page *page;
|
||||
void *addr;
|
||||
|
||||
*handle = ~0;
|
||||
size = PAGE_ALIGN(size);
|
||||
|
||||
page = __dma_alloc_buffer(dev, size, gfp);
|
||||
if (!page)
|
||||
return NULL;
|
||||
|
||||
if (!arch_is_coherent())
|
||||
addr = __dma_alloc_remap(page, size, gfp, prot);
|
||||
else
|
||||
addr = page_address(page);
|
||||
|
||||
if (addr)
|
||||
*handle = page_to_dma(dev, page);
|
||||
|
||||
return addr;
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate DMA-coherent memory space and return both the kernel remapped
|
||||
* virtual and bus address for that space.
|
||||
*/
|
||||
void *
|
||||
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
|
||||
{
|
||||
void *memory;
|
||||
|
||||
if (dma_alloc_from_coherent(dev, size, handle, &memory))
|
||||
return memory;
|
||||
|
||||
return __dma_alloc(dev, size, handle, gfp,
|
||||
pgprot_dmacoherent(pgprot_kernel));
|
||||
}
|
||||
EXPORT_SYMBOL(dma_alloc_coherent);
|
||||
|
||||
/*
|
||||
* Allocate a writecombining region, in much the same way as
|
||||
* dma_alloc_coherent above.
|
||||
*/
|
||||
void *
|
||||
dma_alloc_writecombine(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
|
||||
{
|
||||
return __dma_alloc(dev, size, handle, gfp,
|
||||
pgprot_writecombine(pgprot_kernel));
|
||||
}
|
||||
EXPORT_SYMBOL(dma_alloc_writecombine);
|
||||
|
||||
static int dma_mmap(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
int ret = -ENXIO;
|
||||
#ifdef CONFIG_MMU
|
||||
unsigned long user_size, kern_size;
|
||||
struct arm_vmregion *c;
|
||||
|
||||
user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
|
||||
|
||||
c = arm_vmregion_find(&consistent_head, (unsigned long)cpu_addr);
|
||||
if (c) {
|
||||
unsigned long off = vma->vm_pgoff;
|
||||
|
||||
kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT;
|
||||
|
||||
if (off < kern_size &&
|
||||
user_size <= (kern_size - off)) {
|
||||
ret = remap_pfn_range(vma, vma->vm_start,
|
||||
page_to_pfn(c->vm_pages) + off,
|
||||
user_size << PAGE_SHIFT,
|
||||
vma->vm_page_prot);
|
||||
}
|
||||
}
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
vma->vm_page_prot = pgprot_dmacoherent(vma->vm_page_prot);
|
||||
return dma_mmap(dev, vma, cpu_addr, dma_addr, size);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_mmap_coherent);
|
||||
|
||||
int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
|
||||
void *cpu_addr, dma_addr_t dma_addr, size_t size)
|
||||
{
|
||||
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
|
||||
return dma_mmap(dev, vma, cpu_addr, dma_addr, size);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_mmap_writecombine);
|
||||
|
||||
/*
|
||||
* free a page as defined by the above mapping.
|
||||
* Must not be called with IRQs disabled.
|
||||
*/
|
||||
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
|
||||
{
|
||||
WARN_ON(irqs_disabled());
|
||||
|
||||
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
|
||||
return;
|
||||
|
||||
size = PAGE_ALIGN(size);
|
||||
|
||||
if (!arch_is_coherent())
|
||||
__dma_free_remap(cpu_addr, size);
|
||||
|
||||
__dma_free_buffer(dma_to_page(dev, handle), size);
|
||||
}
|
||||
EXPORT_SYMBOL(dma_free_coherent);
|
||||
|
||||
/*
|
||||
* Make an area consistent for devices.
|
||||
* Note: Drivers should NOT use this function directly, as it will break
|
||||
|
|
|
|||
|
|
@ -0,0 +1,131 @@
|
|||
#include <linux/spinlock.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include "vmregion.h"
|
||||
|
||||
/*
|
||||
* VM region handling support.
|
||||
*
|
||||
* This should become something generic, handling VM region allocations for
|
||||
* vmalloc and similar (ioremap, module space, etc).
|
||||
*
|
||||
* I envisage vmalloc()'s supporting vm_struct becoming:
|
||||
*
|
||||
* struct vm_struct {
|
||||
* struct vmregion region;
|
||||
* unsigned long flags;
|
||||
* struct page **pages;
|
||||
* unsigned int nr_pages;
|
||||
* unsigned long phys_addr;
|
||||
* };
|
||||
*
|
||||
* get_vm_area() would then call vmregion_alloc with an appropriate
|
||||
* struct vmregion head (eg):
|
||||
*
|
||||
* struct vmregion vmalloc_head = {
|
||||
* .vm_list = LIST_HEAD_INIT(vmalloc_head.vm_list),
|
||||
* .vm_start = VMALLOC_START,
|
||||
* .vm_end = VMALLOC_END,
|
||||
* };
|
||||
*
|
||||
* However, vmalloc_head.vm_start is variable (typically, it is dependent on
|
||||
* the amount of RAM found at boot time.) I would imagine that get_vm_area()
|
||||
* would have to initialise this each time prior to calling vmregion_alloc().
|
||||
*/
|
||||
|
||||
struct arm_vmregion *
|
||||
arm_vmregion_alloc(struct arm_vmregion_head *head, size_t size, gfp_t gfp)
|
||||
{
|
||||
unsigned long addr = head->vm_start, end = head->vm_end - size;
|
||||
unsigned long flags;
|
||||
struct arm_vmregion *c, *new;
|
||||
|
||||
if (head->vm_end - head->vm_start < size) {
|
||||
printk(KERN_WARNING "%s: allocation too big (requested %#x)\n",
|
||||
__func__, size);
|
||||
goto out;
|
||||
}
|
||||
|
||||
new = kmalloc(sizeof(struct arm_vmregion), gfp);
|
||||
if (!new)
|
||||
goto out;
|
||||
|
||||
spin_lock_irqsave(&head->vm_lock, flags);
|
||||
|
||||
list_for_each_entry(c, &head->vm_list, vm_list) {
|
||||
if ((addr + size) < addr)
|
||||
goto nospc;
|
||||
if ((addr + size) <= c->vm_start)
|
||||
goto found;
|
||||
addr = c->vm_end;
|
||||
if (addr > end)
|
||||
goto nospc;
|
||||
}
|
||||
|
||||
found:
|
||||
/*
|
||||
* Insert this entry _before_ the one we found.
|
||||
*/
|
||||
list_add_tail(&new->vm_list, &c->vm_list);
|
||||
new->vm_start = addr;
|
||||
new->vm_end = addr + size;
|
||||
new->vm_active = 1;
|
||||
|
||||
spin_unlock_irqrestore(&head->vm_lock, flags);
|
||||
return new;
|
||||
|
||||
nospc:
|
||||
spin_unlock_irqrestore(&head->vm_lock, flags);
|
||||
kfree(new);
|
||||
out:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static struct arm_vmregion *__arm_vmregion_find(struct arm_vmregion_head *head, unsigned long addr)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
|
||||
list_for_each_entry(c, &head->vm_list, vm_list) {
|
||||
if (c->vm_active && c->vm_start == addr)
|
||||
goto out;
|
||||
}
|
||||
c = NULL;
|
||||
out:
|
||||
return c;
|
||||
}
|
||||
|
||||
struct arm_vmregion *arm_vmregion_find(struct arm_vmregion_head *head, unsigned long addr)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&head->vm_lock, flags);
|
||||
c = __arm_vmregion_find(head, addr);
|
||||
spin_unlock_irqrestore(&head->vm_lock, flags);
|
||||
return c;
|
||||
}
|
||||
|
||||
struct arm_vmregion *arm_vmregion_find_remove(struct arm_vmregion_head *head, unsigned long addr)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&head->vm_lock, flags);
|
||||
c = __arm_vmregion_find(head, addr);
|
||||
if (c)
|
||||
c->vm_active = 0;
|
||||
spin_unlock_irqrestore(&head->vm_lock, flags);
|
||||
return c;
|
||||
}
|
||||
|
||||
void arm_vmregion_free(struct arm_vmregion_head *head, struct arm_vmregion *c)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&head->vm_lock, flags);
|
||||
list_del(&c->vm_list);
|
||||
spin_unlock_irqrestore(&head->vm_lock, flags);
|
||||
|
||||
kfree(c);
|
||||
}
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
#ifndef VMREGION_H
|
||||
#define VMREGION_H
|
||||
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/list.h>
|
||||
|
||||
struct page;
|
||||
|
||||
struct arm_vmregion_head {
|
||||
spinlock_t vm_lock;
|
||||
struct list_head vm_list;
|
||||
unsigned long vm_start;
|
||||
unsigned long vm_end;
|
||||
};
|
||||
|
||||
struct arm_vmregion {
|
||||
struct list_head vm_list;
|
||||
unsigned long vm_start;
|
||||
unsigned long vm_end;
|
||||
struct page *vm_pages;
|
||||
int vm_active;
|
||||
};
|
||||
|
||||
struct arm_vmregion *arm_vmregion_alloc(struct arm_vmregion_head *, size_t, gfp_t);
|
||||
struct arm_vmregion *arm_vmregion_find(struct arm_vmregion_head *, unsigned long);
|
||||
struct arm_vmregion *arm_vmregion_find_remove(struct arm_vmregion_head *, unsigned long);
|
||||
void arm_vmregion_free(struct arm_vmregion_head *, struct arm_vmregion *);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue