/*
* Initialise the coherent pool for atomic allocations.
*/
static int __init coherent_init(void)
{
pgprot_t prot = pgprot_dmacoherent(pgprot_kernel);
size_t size = coherent_pool_size;
struct page *page;
void *ptr;
if (cma_available)
ptr = __alloc_from_contiguous(NULL, size, prot, &page);
else
ptr = __alloc_remap_buffer(NULL, size, GFP_KERNEL | GFP_DMA,
prot, &page, NULL);
if (ptr) {
coherent_head.vm_start = (unsigned long) ptr;
coherent_head.vm_end = (unsigned long) ptr + size;
coherent_head.vm_pages = page;
printk(KERN_INFO "DMA: preallocated %u KiB pool for atomic coherent allocations\n",
(unsigned)size / 1024);
return 0;
}
printk(KERN_ERR "DMA: failed to allocate %u KiB pool for atomic coherent allocation\n",
(unsigned)size / 1024);
return -ENOMEM;
}
/*
* Initialise the coherent pool for atomic allocations.
*/
static int __init coherent_init(void)
{
pgprot_t prot = pgprot_dmacoherent(pgprot_kernel);
size_t size = coherent_pool_size;
struct page *page;
void *ptr;
if (!IS_ENABLED(CONFIG_CMA))
return 0;
ptr = __alloc_from_contiguous(NULL, size, prot, &page, false);
if (ptr) {
coherent_head.vm_start = (unsigned long) ptr;
coherent_head.vm_end = (unsigned long) ptr + size;
printk(KERN_INFO "DMA: preallocated %u KiB pool for atomic coherent allocations\n",
(unsigned)size / 1024);
return 0;
}
printk(KERN_ERR "DMA: failed to allocate %u KiB pool for atomic coherent allocation\n",
(unsigned)size / 1024);
return -ENOMEM;
}
