2018-08-24 08:31:08 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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2018-11-04 19:29:28 +00:00
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* Copyright (C) 2012 ARM Ltd.
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2018-08-24 08:31:08 +00:00
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* Copyright (c) 2014 The Linux Foundation
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*/
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2018-11-04 19:29:28 +00:00
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/dma-contiguous.h>
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#include <linux/init.h>
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#include <linux/genalloc.h>
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2018-08-24 08:31:08 +00:00
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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static struct vm_struct *__dma_common_pages_remap(struct page **pages,
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size_t size, unsigned long vm_flags, pgprot_t prot,
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const void *caller)
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{
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struct vm_struct *area;
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area = get_vm_area_caller(size, vm_flags, caller);
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if (!area)
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return NULL;
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if (map_vm_area(area, prot, pages)) {
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vunmap(area->addr);
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return NULL;
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}
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return area;
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}
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/*
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* Remaps an array of PAGE_SIZE pages into another vm_area.
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* Cannot be used in non-sleeping contexts
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*/
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void *dma_common_pages_remap(struct page **pages, size_t size,
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unsigned long vm_flags, pgprot_t prot,
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const void *caller)
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{
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struct vm_struct *area;
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area = __dma_common_pages_remap(pages, size, vm_flags, prot, caller);
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if (!area)
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return NULL;
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area->pages = pages;
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return area->addr;
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}
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/*
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* Remaps an allocated contiguous region into another vm_area.
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* Cannot be used in non-sleeping contexts
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*/
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void *dma_common_contiguous_remap(struct page *page, size_t size,
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unsigned long vm_flags,
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pgprot_t prot, const void *caller)
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{
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int i;
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struct page **pages;
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struct vm_struct *area;
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pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL);
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if (!pages)
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return NULL;
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for (i = 0; i < (size >> PAGE_SHIFT); i++)
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pages[i] = nth_page(page, i);
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area = __dma_common_pages_remap(pages, size, vm_flags, prot, caller);
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kfree(pages);
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if (!area)
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return NULL;
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return area->addr;
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}
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/*
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* Unmaps a range previously mapped by dma_common_*_remap
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*/
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void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
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{
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struct vm_struct *area = find_vm_area(cpu_addr);
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if (!area || (area->flags & vm_flags) != vm_flags) {
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WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
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return;
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}
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unmap_kernel_range((unsigned long)cpu_addr, PAGE_ALIGN(size));
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vunmap(cpu_addr);
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}
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2018-11-04 19:29:28 +00:00
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#ifdef CONFIG_DMA_DIRECT_REMAP
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static struct gen_pool *atomic_pool __ro_after_init;
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#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K
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static size_t atomic_pool_size __initdata = DEFAULT_DMA_COHERENT_POOL_SIZE;
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static int __init early_coherent_pool(char *p)
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{
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atomic_pool_size = memparse(p, &p);
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return 0;
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}
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early_param("coherent_pool", early_coherent_pool);
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int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot)
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{
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unsigned int pool_size_order = get_order(atomic_pool_size);
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unsigned long nr_pages = atomic_pool_size >> PAGE_SHIFT;
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struct page *page;
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void *addr;
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int ret;
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if (dev_get_cma_area(NULL))
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page = dma_alloc_from_contiguous(NULL, nr_pages,
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pool_size_order, false);
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else
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page = alloc_pages(gfp, pool_size_order);
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if (!page)
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goto out;
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memset(page_address(page), 0, atomic_pool_size);
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arch_dma_prep_coherent(page, atomic_pool_size);
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atomic_pool = gen_pool_create(PAGE_SHIFT, -1);
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if (!atomic_pool)
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goto free_page;
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addr = dma_common_contiguous_remap(page, atomic_pool_size, VM_USERMAP,
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prot, __builtin_return_address(0));
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if (!addr)
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goto destroy_genpool;
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ret = gen_pool_add_virt(atomic_pool, (unsigned long)addr,
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page_to_phys(page), atomic_pool_size, -1);
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if (ret)
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goto remove_mapping;
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gen_pool_set_algo(atomic_pool, gen_pool_first_fit_order_align, NULL);
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pr_info("DMA: preallocated %zu KiB pool for atomic allocations\n",
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atomic_pool_size / 1024);
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return 0;
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remove_mapping:
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dma_common_free_remap(addr, atomic_pool_size, VM_USERMAP);
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destroy_genpool:
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gen_pool_destroy(atomic_pool);
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atomic_pool = NULL;
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free_page:
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if (!dma_release_from_contiguous(NULL, page, nr_pages))
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__free_pages(page, pool_size_order);
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out:
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pr_err("DMA: failed to allocate %zu KiB pool for atomic coherent allocation\n",
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atomic_pool_size / 1024);
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return -ENOMEM;
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}
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bool dma_in_atomic_pool(void *start, size_t size)
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{
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return addr_in_gen_pool(atomic_pool, (unsigned long)start, size);
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}
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void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags)
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{
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unsigned long val;
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void *ptr = NULL;
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if (!atomic_pool) {
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WARN(1, "coherent pool not initialised!\n");
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return NULL;
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}
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val = gen_pool_alloc(atomic_pool, size);
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if (val) {
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phys_addr_t phys = gen_pool_virt_to_phys(atomic_pool, val);
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*ret_page = pfn_to_page(__phys_to_pfn(phys));
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ptr = (void *)val;
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memset(ptr, 0, size);
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}
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return ptr;
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}
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bool dma_free_from_pool(void *start, size_t size)
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{
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if (!dma_in_atomic_pool(start, size))
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return false;
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gen_pool_free(atomic_pool, (unsigned long)start, size);
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return true;
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}
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void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flags, unsigned long attrs)
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{
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struct page *page = NULL;
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2018-11-04 16:38:39 +00:00
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void *ret;
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2018-11-04 19:29:28 +00:00
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size = PAGE_ALIGN(size);
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if (!gfpflags_allow_blocking(flags)) {
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ret = dma_alloc_from_pool(size, &page, flags);
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if (!ret)
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return NULL;
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*dma_handle = phys_to_dma(dev, page_to_phys(page));
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return ret;
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}
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2018-11-04 16:38:39 +00:00
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page = __dma_direct_alloc_pages(dev, size, dma_handle, flags, attrs);
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if (!page)
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2018-11-04 19:29:28 +00:00
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return NULL;
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/* remove any dirty cache lines on the kernel alias */
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arch_dma_prep_coherent(page, size);
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/* create a coherent mapping */
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ret = dma_common_contiguous_remap(page, size, VM_USERMAP,
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arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs),
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__builtin_return_address(0));
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if (!ret)
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2018-11-04 16:38:39 +00:00
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__dma_direct_free_pages(dev, size, page);
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2018-11-04 19:29:28 +00:00
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return ret;
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}
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void arch_dma_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle, unsigned long attrs)
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{
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if (!dma_free_from_pool(vaddr, PAGE_ALIGN(size))) {
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2018-11-04 16:38:39 +00:00
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phys_addr_t phys = dma_to_phys(dev, dma_handle);
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struct page *page = pfn_to_page(__phys_to_pfn(phys));
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2018-11-04 19:29:28 +00:00
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vunmap(vaddr);
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2018-11-04 16:38:39 +00:00
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__dma_direct_free_pages(dev, size, page);
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2018-11-04 19:29:28 +00:00
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}
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}
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long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
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dma_addr_t dma_addr)
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{
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return __phys_to_pfn(dma_to_phys(dev, dma_addr));
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}
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#endif /* CONFIG_DMA_DIRECT_REMAP */
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