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Diffstat (limited to 'drivers/base/dma-contiguous.c')
-rw-r--r--drivers/base/dma-contiguous.c125
1 files changed, 77 insertions, 48 deletions
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 6467c919c509..9021762227a7 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -213,26 +213,9 @@ static int __init cma_init_reserved_areas(void)
}
core_initcall(cma_init_reserved_areas);
-/**
- * dma_contiguous_reserve_area() - reserve custom contiguous area
- * @size: Size of the reserved area (in bytes),
- * @base: Base address of the reserved area optional, use 0 for any
- * @limit: End address of the reserved memory (optional, 0 for any).
- * @res_cma: Pointer to store the created cma region.
- * @fixed: hint about where to place the reserved area
- *
- * This function reserves memory from early allocator. It should be
- * called by arch specific code once the early allocator (memblock or bootmem)
- * has been activated and all other subsystems have already allocated/reserved
- * memory. This function allows to create custom reserved areas for specific
- * devices.
- *
- * If @fixed is true, reserve contiguous area at exactly @base. If false,
- * reserve in range from @base to @limit.
- */
-int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
- phys_addr_t limit, struct cma **res_cma,
- bool fixed)
+static int __init __dma_contiguous_reserve_area(phys_addr_t size,
+ phys_addr_t base, phys_addr_t limit,
+ struct cma **res_cma, bool fixed)
{
struct cma *cma = &cma_areas[cma_area_count];
phys_addr_t alignment;
@@ -286,15 +269,47 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
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", (unsigned long)size / SZ_1M);
return ret;
}
+/**
+ * dma_contiguous_reserve_area() - reserve custom contiguous area
+ * @size: Size of the reserved area (in bytes),
+ * @base: Base address of the reserved area optional, use 0 for any
+ * @limit: End address of the reserved memory (optional, 0 for any).
+ * @res_cma: Pointer to store the created cma region.
+ * @fixed: hint about where to place the reserved area
+ *
+ * This function reserves memory from early allocator. It should be
+ * called by arch specific code once the early allocator (memblock or bootmem)
+ * has been activated and all other subsystems have already allocated/reserved
+ * memory. This function allows to create custom reserved areas for specific
+ * devices.
+ *
+ * If @fixed is true, reserve contiguous area at exactly @base. If false,
+ * reserve in range from @base to @limit.
+ */
+int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
+ phys_addr_t limit, struct cma **res_cma,
+ bool fixed)
+{
+ int ret;
+
+ ret = __dma_contiguous_reserve_area(size, base, limit, res_cma, fixed);
+ if (ret)
+ return ret;
+
+ /* Architecture specific contiguous memory fixup. */
+ dma_contiguous_early_fixup(PFN_PHYS((*res_cma)->base_pfn),
+ (*res_cma)->count << PAGE_SHIFT);
+
+ return 0;
+}
+
static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count)
{
mutex_lock(&cma->lock);
@@ -302,31 +317,16 @@ static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count)
mutex_unlock(&cma->lock);
}
-/**
- * dma_alloc_from_contiguous() - allocate pages from contiguous area
- * @dev: Pointer to device for which the allocation is performed.
- * @count: Requested number of pages.
- * @align: Requested alignment of pages (in PAGE_SIZE order).
- *
- * This function allocates memory buffer for specified device. It uses
- * device specific contiguous memory area if available or the default
- * global one. Requires architecture specific dev_get_cma_area() helper
- * function.
- */
-struct page *dma_alloc_from_contiguous(struct device *dev, int count,
+static struct page *__dma_alloc_from_contiguous(struct cma *cma, int count,
unsigned int align)
{
unsigned long mask, pfn, pageno, start = 0;
- struct cma *cma = dev_get_cma_area(dev);
struct page *page = NULL;
int ret;
if (!cma || !cma->count)
return NULL;
- if (align > CONFIG_CMA_ALIGNMENT)
- align = CONFIG_CMA_ALIGNMENT;
-
pr_debug("%s(cma %p, count %d, align %d)\n", __func__, (void *)cma,
count, align);
@@ -375,19 +375,30 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
}
/**
- * dma_release_from_contiguous() - release allocated pages
- * @dev: Pointer to device for which the pages were allocated.
- * @pages: Allocated pages.
- * @count: Number of allocated pages.
+ * dma_alloc_from_contiguous() - allocate pages from contiguous area
+ * @dev: Pointer to device for which the allocation is performed.
+ * @count: Requested number of pages.
+ * @align: Requested alignment of pages (in PAGE_SIZE order).
*
- * This function releases memory allocated by dma_alloc_from_contiguous().
- * It returns false when provided pages do not belong to contiguous area and
- * true otherwise.
+ * This function allocates memory buffer for specified device. It uses
+ * device specific contiguous memory area if available or the default
+ * global one. Requires architecture specific dev_get_cma_area() helper
+ * function.
*/
-bool dma_release_from_contiguous(struct device *dev, struct page *pages,
- int count)
+struct page *dma_alloc_from_contiguous(struct device *dev, int count,
+ unsigned int align)
{
struct cma *cma = dev_get_cma_area(dev);
+
+ if (align > CONFIG_CMA_ALIGNMENT)
+ align = CONFIG_CMA_ALIGNMENT;
+
+ return __dma_alloc_from_contiguous(cma, count, align);
+}
+
+static bool __dma_release_from_contiguous(struct cma *cma, struct page *pages,
+ int count)
+{
unsigned long pfn;
if (!cma || !pages)
@@ -407,3 +418,21 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages,
return true;
}
+
+/**
+ * dma_release_from_contiguous() - release allocated pages
+ * @dev: Pointer to device for which the pages were allocated.
+ * @pages: Allocated pages.
+ * @count: Number of allocated pages.
+ *
+ * This function releases memory allocated by dma_alloc_from_contiguous().
+ * It returns false when provided pages do not belong to contiguous area and
+ * true otherwise.
+ */
+bool dma_release_from_contiguous(struct device *dev, struct page *pages,
+ int count)
+{
+ struct cma *cma = dev_get_cma_area(dev);
+
+ return __dma_release_from_contiguous(cma, pages, count);
+}