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staging: android: persistent_ram: Introduce persistent_ram_vmap()

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Factor out vmap logic out of persistent_ram_buffer_map(), this will
make the code a bit more understandable when we'll add support for
non-bootmem memory.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov 2012-05-11 17:17:43 -07:00 • committed by Greg Kroah-Hartman
parent 8cf5aff89e
commit 2b1321e471
1 changed files with 14 additions and 5 deletions
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19
drivers/staging/android/persistent_ram.c
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@ -318,14 +318,14 @@ void persistent_ram_free_old(struct persistent_ram_zone *prz)
prz->old_log_size = 0; prz->old_log_size = 0;
} }
static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, static void *persistent_ram_vmap(phys_addr_t start, size_t size)
struct persistent_ram_zone *prz)
{ {
struct page **pages; struct page **pages;
phys_addr_t page_start; phys_addr_t page_start;
unsigned int page_count; unsigned int page_count;
pgprot_t prot; pgprot_t prot;
unsigned int i; unsigned int i;
void *vaddr;
page_start = start - offset_in_page(start); page_start = start - offset_in_page(start);
page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
@ -336,17 +336,26 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
if (!pages) { if (!pages) {
pr_err("%s: Failed to allocate array for %u pages\n", __func__, pr_err("%s: Failed to allocate array for %u pages\n", __func__,
page_count); page_count);
return -ENOMEM; return NULL;
} }
for (i = 0; i < page_count; i++) { for (i = 0; i < page_count; i++) {
phys_addr_t addr = page_start + i * PAGE_SIZE; phys_addr_t addr = page_start + i * PAGE_SIZE;
pages[i] = pfn_to_page(addr >> PAGE_SHIFT); pages[i] = pfn_to_page(addr >> PAGE_SHIFT);
} }
prz->vaddr = vmap(pages, page_count, VM_MAP, prot); vaddr = vmap(pages, page_count, VM_MAP, prot);
kfree(pages); kfree(pages);
return vaddr;
}
static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
struct persistent_ram_zone *prz)
{
prz->vaddr = persistent_ram_vmap(start, size);
if (!prz->vaddr) { if (!prz->vaddr) {
pr_err("%s: Failed to map %u pages\n", __func__, page_count); pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__,
(unsigned long long)size, (unsigned long long)start);
return -ENOMEM; return -ENOMEM;
} }