brain-hackers_pepepper-mirror/linux-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/linux-brain.git synced 2024-06-09 15:26:21 +09:00
Code Issues Projects Releases Wiki Activity

csky/dma: Fixup cache_op failed when cross memory ZONEs

Browse Source 
If the paddr and size are cross between NORMAL_ZONE and HIGHMEM_ZONE
memory range, cache_op will panic in do_page_fault with bad_area.

Optimize the code to support the range which cross memory ZONEs.

Changes for V2:
 - Revert back to postcore_initcall

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren 2019-07-30 17:02:26 +08:00
parent 7f80fe207d
commit 4af9027d3f
1 changed files with 26 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
arch/csky/mm/dma-mapping.c
View File

@ -20,69 +20,50 @@ static int __init atomic_pool_init(void)
}
postcore_initcall(atomic_pool_init);
void arch_dma_prep_coherent(struct page *page, size_t size)
{
if (PageHighMem(page)) {
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
do {
void *ptr = kmap_atomic(page);
size_t _size = (size < PAGE_SIZE) ? size : PAGE_SIZE;
memset(ptr, 0, _size);
dma_wbinv_range((unsigned long)ptr,
(unsigned long)ptr + _size);
kunmap_atomic(ptr);
page++;
size -= PAGE_SIZE;
count--;
} while (count);
} else {
void *ptr = page_address(page);
memset(ptr, 0, size);
dma_wbinv_range((unsigned long)ptr, (unsigned long)ptr + size);
}
}
static inline void cache_op(phys_addr_t paddr, size_t size,
void (*fn)(unsigned long start, unsigned long end))
{
struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
unsigned int offset = paddr & ~PAGE_MASK;
size_t left = size;
unsigned long start;
struct page *page = phys_to_page(paddr);
void *start = __va(page_to_phys(page));
unsigned long offset = offset_in_page(paddr);
size_t left = size;
do {
size_t len = left;
if (offset + len > PAGE_SIZE)
len = PAGE_SIZE - offset;
if (PageHighMem(page)) {
void *addr;
start = kmap_atomic(page);
if (offset + len > PAGE_SIZE) {
if (offset >= PAGE_SIZE) {
page += offset >> PAGE_SHIFT;
offset &= ~PAGE_MASK;
}
len = PAGE_SIZE - offset;
}
fn((unsigned long)start + offset,
(unsigned long)start + offset + len);
addr = kmap_atomic(page);
start = (unsigned long)(addr + offset);
fn(start, start + len);
kunmap_atomic(addr);
kunmap_atomic(start);
} else {
start = (unsigned long)phys_to_virt(paddr);
fn(start, start + size);
fn((unsigned long)start + offset,
(unsigned long)start + offset + len);
}
offset = 0;
page++;
start += PAGE_SIZE;
left -= len;
} while (left);
}
static void dma_wbinv_set_zero_range(unsigned long start, unsigned long end)
{
memset((void *)start, 0, end - start);
dma_wbinv_range(start, end);
}
void arch_dma_prep_coherent(struct page *page, size_t size)
{
cache_op(page_to_phys(page), size, dma_wbinv_set_zero_range);
}
void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
size_t size, enum dma_data_direction dir)
{