static __ref void *early_alloc_pgtable(unsigned long size, int nid,
unsigned long region_start, unsigned long region_end)
{
unsigned long pa = 0;
void *pt;
if (region_start || region_end) /* has region hint */
pa = memblock_alloc_range(size, size, region_start, region_end,
MEMBLOCK_NONE);
else if (nid != -1) /* has node hint */
pa = memblock_alloc_base_nid(size, size,
MEMBLOCK_ALLOC_ANYWHERE,
nid, MEMBLOCK_NONE);
if (!pa)
pa = memblock_alloc_base(size, size, MEMBLOCK_ALLOC_ANYWHERE);
BUG_ON(!pa);
pt = __va(pa);
memset(pt, 0, size);
return pt;
}
/**
* 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)
{
struct cma *cma = &cma_areas[cma_area_count];
phys_addr_t alignment;
int ret = 0;
pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__,
(unsigned long)size, (unsigned long)base,
(unsigned long)limit);
/* Sanity checks */
if (cma_area_count == ARRAY_SIZE(cma_areas)) {
pr_err("Not enough slots for CMA reserved regions!\n");
return -ENOSPC;
}
if (!size)
return -EINVAL;
/* Sanitise input arguments */
alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
base = ALIGN(base, alignment);
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);
/* Reserve memory */
if (base && fixed) {
if (memblock_is_region_reserved(base, size) ||
memblock_reserve(base, size) < 0) {
ret = -EBUSY;
goto err;
}
} else {
phys_addr_t addr = memblock_alloc_range(size, alignment, base,
limit);
if (!addr) {
ret = -ENOMEM;
goto err;
} else {
base = addr;
}
}
/*
* Each reserved area must be initialised later, when more kernel
* subsystems (like slab allocator) are available.
*/
cma->base_pfn = PFN_DOWN(base);
cma->count = size >> PAGE_SHIFT;
*res_cma = cma;
cma_area_count++;
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;
}
