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drivers: cma: represent physical addresses as phys_addr_t 

This commit changes the CMA early initialization code to use phys_addr_t
for representing physical addresses instead of unsigned long.

Without this change, among other things, dma_declare_contiguous() simply
discards any memory regions whose address is not representable as unsigned
long.

This is a problem on 32-bit PAE machines where unsigned long is 32-bit
but physical address space is larger.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Vitaly Andrianov 2012-12-05 09:29:25 -05:00 committed by Marek Szyprowski
parent 387870f2d6
commit 4009793e15
2 changed files with 12 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/base/dma-contiguous.c
View File

@ -57,8 +57,8 @@ struct cma *dma_contiguous_default_area;
* Users, who want to set the size of global CMA area for their system
* should use cma= kernel parameter.
*/
static const unsigned long size_bytes = CMA_SIZE_MBYTES * SZ_1M;
static long size_cmdline = -1;
static const phys_addr_t size_bytes = CMA_SIZE_MBYTES * SZ_1M;
static phys_addr_t size_cmdline = -1;
static int __init early_cma(char *p)
{
@ -70,7 +70,7 @@ early_param("cma", early_cma);
#ifdef CONFIG_CMA_SIZE_PERCENTAGE
static unsigned long __init __maybe_unused cma_early_percent_memory(void)
static phys_addr_t __init __maybe_unused cma_early_percent_memory(void)
{
struct memblock_region *reg;
unsigned long total_pages = 0;
@ -88,7 +88,7 @@ static unsigned long __init __maybe_unused cma_early_percent_memory(void)
#else
static inline __maybe_unused unsigned long cma_early_percent_memory(void)
static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
{
return 0;
}
@ -106,7 +106,7 @@ static inline __maybe_unused unsigned long cma_early_percent_memory(void)
*/
void __init dma_contiguous_reserve(phys_addr_t limit)
{
unsigned long selected_size = 0;
phys_addr_t selected_size = 0;
pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);
@ -126,7 +126,7 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
if (selected_size) {
pr_debug("%s: reserving %ld MiB for global area\n", __func__,
selected_size / SZ_1M);
(unsigned long)selected_size / SZ_1M);
dma_declare_contiguous(NULL, selected_size, 0, limit);
}
@ -227,11 +227,11 @@ core_initcall(cma_init_reserved_areas);
* called by board specific code when early allocator (memblock or bootmem)
* is still activate.
*/
int __init dma_declare_contiguous(struct device *dev, unsigned long size,
int __init dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
struct cma_reserved *r = &cma_reserved[cma_reserved_count];
unsigned long alignment;
phys_addr_t alignment;
pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__,
(unsigned long)size, (unsigned long)base,
@ -268,10 +268,6 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
if (!addr) {
base = -ENOMEM;
goto err;
} else if (addr + size > ~(unsigned long)0) {
memblock_free(addr, size);
base = -EINVAL;
goto err;
} else {
base = addr;
}
@ -285,14 +281,14 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
r->size = size;
r->dev = dev;
cma_reserved_count++;
pr_info("CMA: reserved %ld MiB at %08lx\n", size / SZ_1M,
pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
(unsigned long)base);
/* Architecture specific contiguous memory fixup. */
dma_contiguous_early_fixup(base, size);
return 0;
err:
pr_err("CMA: failed to reserve %ld MiB\n", size / SZ_1M);
pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
return base;
}

4
include/linux/dma-contiguous.h
View File

@ -68,7 +68,7 @@ struct device;
extern struct cma *dma_contiguous_default_area;
void dma_contiguous_reserve(phys_addr_t addr_limit);
int dma_declare_contiguous(struct device *dev, unsigned long size,
int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit);
struct page *dma_alloc_from_contiguous(struct device *dev, int count,
@ -83,7 +83,7 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages,
static inline void dma_contiguous_reserve(phys_addr_t limit) { }
static inline
int dma_declare_contiguous(struct device *dev, unsigned long size,
int dma_declare_contiguous(struct device *dev, phys_addr_t size,
phys_addr_t base, phys_addr_t limit)
{
return -ENOSYS;