void homecache_free_pages(unsigned long addr, unsigned int order)
{
if (addr != 0) {
VM_BUG_ON(!virt_addr_valid((void *)addr));
__homecache_free_pages(virt_to_page((void *)addr), order);
}
}
static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs)
{
u64 dma_mask = (dev && dev->coherent_dma_mask) ?
dev->coherent_dma_mask : DMA_BIT_MASK(32);
int node = dev ? dev_to_node(dev) : 0;
int order = get_order(size);
struct page *pg;
dma_addr_t addr;
gfp |= __GFP_ZERO;
/*
* If the mask specifies that the memory be in the first 4 GB, then
* we force the allocation to come from the DMA zone. We also
* force the node to 0 since that's the only node where the DMA
* zone isn't empty. If the mask size is smaller than 32 bits, we
* may still not be able to guarantee a suitable memory address, in
* which case we will return NULL. But such devices are uncommon.
*/
if (dma_mask <= DMA_BIT_MASK(32)) {
gfp |= GFP_DMA;
node = 0;
}
pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_DMA);
if (pg == NULL)
return NULL;
addr = page_to_phys(pg);
if (addr + size > dma_mask) {
__homecache_free_pages(pg, order);
return NULL;
}
*dma_handle = addr;
return page_address(pg);
}