ARM: dma-mapping: remove custom consistent dma region
This patch changes dma-mapping subsystem to use generic vmalloc areas for all consistent dma allocations. This increases the total size limit of the consistent allocations and removes platform hacks and a lot of duplicated code. Atomic allocations are served from special pool preallocated on boot, because vmalloc areas cannot be reliably created in atomic context. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Reviewed-by: Minchan Kim <minchan@kernel.org>
This commit is contained in:
Marek Szyprowski
Родитель
5e6cafc83e
Коммит
e9da6e9905
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@ -526,7 +526,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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coherent_pool=nn[KMG] [ARM,KNL]
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Sets the size of memory pool for coherent, atomic dma
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allocations if Contiguous Memory Allocator (CMA) is used.
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allocations, by default set to 256K.
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code_bytes [X86] How many bytes of object code to print
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in an oops report.
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@ -226,7 +226,7 @@ static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struc
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* DMA region above it's default value of 2MB. It must be called before the
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* memory allocator is initialised, i.e. before any core_initcall.
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*/
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extern void __init init_consistent_dma_size(unsigned long size);
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static inline void init_consistent_dma_size(unsigned long size) { }
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/*
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* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
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@ -22,6 +22,7 @@
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <linux/iommu.h>
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#include <linux/io.h>
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#include <linux/vmalloc.h>
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#include <asm/memory.h>
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@ -217,115 +218,70 @@ static void __dma_free_buffer(struct page *page, size_t size)
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}
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#ifdef CONFIG_MMU
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#define CONSISTENT_OFFSET(x) (((unsigned long)(x) - consistent_base) >> PAGE_SHIFT)
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#define CONSISTENT_PTE_INDEX(x) (((unsigned long)(x) - consistent_base) >> PMD_SHIFT)
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/*
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* These are the page tables (2MB each) covering uncached, DMA consistent allocations
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*/
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static pte_t **consistent_pte;
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#define DEFAULT_CONSISTENT_DMA_SIZE SZ_2M
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static unsigned long consistent_base = CONSISTENT_END - DEFAULT_CONSISTENT_DMA_SIZE;
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void __init init_consistent_dma_size(unsigned long size)
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{
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unsigned long base = CONSISTENT_END - ALIGN(size, SZ_2M);
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BUG_ON(consistent_pte); /* Check we're called before DMA region init */
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BUG_ON(base < VMALLOC_END);
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/* Grow region to accommodate specified size */
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if (base < consistent_base)
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consistent_base = base;
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}
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#include "vmregion.h"
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static struct arm_vmregion_head consistent_head = {
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.vm_lock = __SPIN_LOCK_UNLOCKED(&consistent_head.vm_lock),
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.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
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.vm_end = CONSISTENT_END,
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};
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#ifdef CONFIG_HUGETLB_PAGE
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#error ARM Coherent DMA allocator does not (yet) support huge TLB
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#endif
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/*
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* Initialise the consistent memory allocation.
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*/
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static int __init consistent_init(void)
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{
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int ret = 0;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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int i = 0;
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unsigned long base = consistent_base;
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unsigned long num_ptes = (CONSISTENT_END - base) >> PMD_SHIFT;
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if (IS_ENABLED(CONFIG_CMA) && !IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
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return 0;
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consistent_pte = kmalloc(num_ptes * sizeof(pte_t), GFP_KERNEL);
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if (!consistent_pte) {
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pr_err("%s: no memory\n", __func__);
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return -ENOMEM;
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}
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pr_debug("DMA memory: 0x%08lx - 0x%08lx:\n", base, CONSISTENT_END);
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consistent_head.vm_start = base;
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do {
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pgd = pgd_offset(&init_mm, base);
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pud = pud_alloc(&init_mm, pgd, base);
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if (!pud) {
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pr_err("%s: no pud tables\n", __func__);
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ret = -ENOMEM;
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break;
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}
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pmd = pmd_alloc(&init_mm, pud, base);
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if (!pmd) {
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pr_err("%s: no pmd tables\n", __func__);
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ret = -ENOMEM;
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break;
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}
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WARN_ON(!pmd_none(*pmd));
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pte = pte_alloc_kernel(pmd, base);
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if (!pte) {
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pr_err("%s: no pte tables\n", __func__);
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ret = -ENOMEM;
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break;
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}
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consistent_pte[i++] = pte;
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base += PMD_SIZE;
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} while (base < CONSISTENT_END);
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return ret;
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}
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core_initcall(consistent_init);
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static void *__alloc_from_contiguous(struct device *dev, size_t size,
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pgprot_t prot, struct page **ret_page);
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static struct arm_vmregion_head coherent_head = {
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.vm_lock = __SPIN_LOCK_UNLOCKED(&coherent_head.vm_lock),
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.vm_list = LIST_HEAD_INIT(coherent_head.vm_list),
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static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp,
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pgprot_t prot, struct page **ret_page,
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const void *caller);
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static void *
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__dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, 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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unsigned long addr;
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/*
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* DMA allocation can be mapped to user space, so lets
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* set VM_USERMAP flags too.
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*/
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area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
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caller);
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if (!area)
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return NULL;
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addr = (unsigned long)area->addr;
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area->phys_addr = __pfn_to_phys(page_to_pfn(page));
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if (ioremap_page_range(addr, addr + size, area->phys_addr, prot)) {
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vunmap((void *)addr);
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return NULL;
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}
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return (void *)addr;
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}
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static void __dma_free_remap(void *cpu_addr, size_t size)
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{
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unsigned int flags = VM_ARM_DMA_CONSISTENT | VM_USERMAP;
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struct vm_struct *area = find_vm_area(cpu_addr);
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if (!area || (area->flags & flags) != 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, size);
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vunmap(cpu_addr);
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}
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struct dma_pool {
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size_t size;
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spinlock_t lock;
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unsigned long *bitmap;
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unsigned long nr_pages;
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void *vaddr;
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struct page *page;
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};
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static size_t coherent_pool_size = DEFAULT_CONSISTENT_DMA_SIZE / 8;
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static struct dma_pool atomic_pool = {
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.size = SZ_256K,
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};
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static int __init early_coherent_pool(char *p)
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{
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coherent_pool_size = memparse(p, &p);
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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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@ -333,32 +289,45 @@ early_param("coherent_pool", early_coherent_pool);
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/*
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* Initialise the coherent pool for atomic allocations.
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*/
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static int __init coherent_init(void)
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static int __init atomic_pool_init(void)
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{
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struct dma_pool *pool = &atomic_pool;
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pgprot_t prot = pgprot_dmacoherent(pgprot_kernel);
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size_t size = coherent_pool_size;
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unsigned long nr_pages = pool->size >> PAGE_SHIFT;
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unsigned long *bitmap;
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struct page *page;
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void *ptr;
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int bitmap_size = BITS_TO_LONGS(nr_pages) * sizeof(long);
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if (!IS_ENABLED(CONFIG_CMA))
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return 0;
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bitmap = kzalloc(bitmap_size, GFP_KERNEL);
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if (!bitmap)
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goto no_bitmap;
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ptr = __alloc_from_contiguous(NULL, size, prot, &page);
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if (IS_ENABLED(CONFIG_CMA))
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ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page);
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else
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ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot,
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&page, NULL);
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if (ptr) {
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coherent_head.vm_start = (unsigned long) ptr;
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coherent_head.vm_end = (unsigned long) ptr + size;
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printk(KERN_INFO "DMA: preallocated %u KiB pool for atomic coherent allocations\n",
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(unsigned)size / 1024);
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spin_lock_init(&pool->lock);
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pool->vaddr = ptr;
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pool->page = page;
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pool->bitmap = bitmap;
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pool->nr_pages = nr_pages;
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pr_info("DMA: preallocated %u KiB pool for atomic coherent allocations\n",
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(unsigned)pool->size / 1024);
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return 0;
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}
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printk(KERN_ERR "DMA: failed to allocate %u KiB pool for atomic coherent allocation\n",
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(unsigned)size / 1024);
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kfree(bitmap);
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no_bitmap:
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pr_err("DMA: failed to allocate %u KiB pool for atomic coherent allocation\n",
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(unsigned)pool->size / 1024);
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return -ENOMEM;
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}
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/*
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* CMA is activated by core_initcall, so we must be called after it.
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*/
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postcore_initcall(coherent_init);
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postcore_initcall(atomic_pool_init);
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struct dma_contig_early_reserve {
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phys_addr_t base;
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@ -406,112 +375,6 @@ void __init dma_contiguous_remap(void)
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}
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}
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static void *
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__dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot,
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const void *caller)
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{
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struct arm_vmregion *c;
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size_t align;
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int bit;
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if (!consistent_pte) {
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pr_err("%s: not initialised\n", __func__);
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dump_stack();
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return NULL;
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}
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/*
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* Align the virtual region allocation - maximum alignment is
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* a section size, minimum is a page size. This helps reduce
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* fragmentation of the DMA space, and also prevents allocations
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* smaller than a section from crossing a section boundary.
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*/
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bit = fls(size - 1);
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if (bit > SECTION_SHIFT)
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bit = SECTION_SHIFT;
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align = 1 << bit;
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/*
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* Allocate a virtual address in the consistent mapping region.
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*/
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c = arm_vmregion_alloc(&consistent_head, align, size,
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gfp & ~(__GFP_DMA | __GFP_HIGHMEM), caller);
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if (c) {
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pte_t *pte;
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int idx = CONSISTENT_PTE_INDEX(c->vm_start);
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u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
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pte = consistent_pte[idx] + off;
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c->priv = page;
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do {
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BUG_ON(!pte_none(*pte));
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set_pte_ext(pte, mk_pte(page, prot), 0);
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page++;
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pte++;
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off++;
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if (off >= PTRS_PER_PTE) {
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off = 0;
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pte = consistent_pte[++idx];
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}
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} while (size -= PAGE_SIZE);
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dsb();
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return (void *)c->vm_start;
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}
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return NULL;
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}
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static void __dma_free_remap(void *cpu_addr, size_t size)
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{
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struct arm_vmregion *c;
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unsigned long addr;
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pte_t *ptep;
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int idx;
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u32 off;
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c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr);
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if (!c) {
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pr_err("%s: trying to free invalid coherent area: %p\n",
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__func__, cpu_addr);
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dump_stack();
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return;
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}
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if ((c->vm_end - c->vm_start) != size) {
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pr_err("%s: freeing wrong coherent size (%ld != %d)\n",
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__func__, c->vm_end - c->vm_start, size);
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dump_stack();
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size = c->vm_end - c->vm_start;
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}
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idx = CONSISTENT_PTE_INDEX(c->vm_start);
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off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
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ptep = consistent_pte[idx] + off;
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addr = c->vm_start;
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do {
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pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
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ptep++;
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addr += PAGE_SIZE;
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off++;
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if (off >= PTRS_PER_PTE) {
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off = 0;
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ptep = consistent_pte[++idx];
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}
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if (pte_none(pte) || !pte_present(pte))
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pr_crit("%s: bad page in kernel page table\n",
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__func__);
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} while (size -= PAGE_SIZE);
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flush_tlb_kernel_range(c->vm_start, c->vm_end);
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arm_vmregion_free(&consistent_head, c);
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}
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static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr,
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void *data)
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{
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@ -552,16 +415,17 @@ static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp,
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return ptr;
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}
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static void *__alloc_from_pool(struct device *dev, size_t size,
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struct page **ret_page, const void *caller)
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static void *__alloc_from_pool(size_t size, struct page **ret_page)
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{
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struct arm_vmregion *c;
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struct dma_pool *pool = &atomic_pool;
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unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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unsigned int pageno;
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unsigned long flags;
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void *ptr = NULL;
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size_t align;
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if (!coherent_head.vm_start) {
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printk(KERN_ERR "%s: coherent pool not initialised!\n",
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__func__);
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dump_stack();
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if (!pool->vaddr) {
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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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@ -571,35 +435,41 @@ static void *__alloc_from_pool(struct device *dev, size_t size,
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* size. This helps reduce fragmentation of the DMA space.
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*/
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align = PAGE_SIZE << get_order(size);
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c = arm_vmregion_alloc(&coherent_head, align, size, 0, caller);
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if (c) {
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void *ptr = (void *)c->vm_start;
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struct page *page = virt_to_page(ptr);
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*ret_page = page;
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return ptr;
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spin_lock_irqsave(&pool->lock, flags);
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pageno = bitmap_find_next_zero_area(pool->bitmap, pool->nr_pages,
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0, count, (1 << align) - 1);
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if (pageno < pool->nr_pages) {
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bitmap_set(pool->bitmap, pageno, count);
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ptr = pool->vaddr + PAGE_SIZE * pageno;
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*ret_page = pool->page + pageno;
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}
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return NULL;
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spin_unlock_irqrestore(&pool->lock, flags);
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return ptr;
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}
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static int __free_from_pool(void *cpu_addr, size_t size)
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static int __free_from_pool(void *start, size_t size)
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{
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unsigned long start = (unsigned long)cpu_addr;
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unsigned long end = start + size;
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struct arm_vmregion *c;
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struct dma_pool *pool = &atomic_pool;
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unsigned long pageno, count;
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unsigned long flags;
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if (start < coherent_head.vm_start || end > coherent_head.vm_end)
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if (start < pool->vaddr || start > pool->vaddr + pool->size)
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return 0;
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c = arm_vmregion_find_remove(&coherent_head, (unsigned long)start);
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if ((c->vm_end - c->vm_start) != size) {
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printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
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__func__, c->vm_end - c->vm_start, size);
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dump_stack();
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size = c->vm_end - c->vm_start;
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if (start + size > pool->vaddr + pool->size) {
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WARN(1, "freeing wrong coherent size from pool\n");
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return 0;
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}
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arm_vmregion_free(&coherent_head, c);
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pageno = (start - pool->vaddr) >> PAGE_SHIFT;
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count = size >> PAGE_SHIFT;
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spin_lock_irqsave(&pool->lock, flags);
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bitmap_clear(pool->bitmap, pageno, count);
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spin_unlock_irqrestore(&pool->lock, flags);
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return 1;
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}
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@ -644,7 +514,7 @@ static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot)
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|
||||
#define __get_dma_pgprot(attrs, prot) __pgprot(0)
|
||||
#define __alloc_remap_buffer(dev, size, gfp, prot, ret, c) NULL
|
||||
#define __alloc_from_pool(dev, size, ret_page, c) NULL
|
||||
#define __alloc_from_pool(size, ret_page) NULL
|
||||
#define __alloc_from_contiguous(dev, size, prot, ret) NULL
|
||||
#define __free_from_pool(cpu_addr, size) 0
|
||||
#define __free_from_contiguous(dev, page, size) do { } while (0)
|
||||
|
|
@ -702,10 +572,10 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
|
|||
|
||||
if (arch_is_coherent() || nommu())
|
||||
addr = __alloc_simple_buffer(dev, size, gfp, &page);
|
||||
else if (gfp & GFP_ATOMIC)
|
||||
addr = __alloc_from_pool(size, &page);
|
||||
else if (!IS_ENABLED(CONFIG_CMA))
|
||||
addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);
|
||||
else if (gfp & GFP_ATOMIC)
|
||||
addr = __alloc_from_pool(dev, size, &page, caller);
|
||||
else
|
||||
addr = __alloc_from_contiguous(dev, size, prot, &page);
|
||||
|
||||
|
|
@ -998,9 +868,6 @@ static int arm_dma_set_mask(struct device *dev, u64 dma_mask)
|
|||
|
||||
static int __init dma_debug_do_init(void)
|
||||
{
|
||||
#ifdef CONFIG_MMU
|
||||
arm_vmregion_create_proc("dma-mappings", &consistent_head);
|
||||
#endif
|
||||
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1117,61 +984,32 @@ static int __iommu_free_buffer(struct device *dev, struct page **pages, size_t s
|
|||
* Create a CPU mapping for a specified pages
|
||||
*/
|
||||
static void *
|
||||
__iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot)
|
||||
__iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot,
|
||||
const void *caller)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
size_t align;
|
||||
size_t count = size >> PAGE_SHIFT;
|
||||
int bit;
|
||||
unsigned int i, nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
||||
struct vm_struct *area;
|
||||
unsigned long p;
|
||||
|
||||
if (!consistent_pte[0]) {
|
||||
pr_err("%s: not initialised\n", __func__);
|
||||
dump_stack();
|
||||
area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
|
||||
caller);
|
||||
if (!area)
|
||||
return NULL;
|
||||
|
||||
area->pages = pages;
|
||||
area->nr_pages = nr_pages;
|
||||
p = (unsigned long)area->addr;
|
||||
|
||||
for (i = 0; i < nr_pages; i++) {
|
||||
phys_addr_t phys = __pfn_to_phys(page_to_pfn(pages[i]));
|
||||
if (ioremap_page_range(p, p + PAGE_SIZE, phys, prot))
|
||||
goto err;
|
||||
p += PAGE_SIZE;
|
||||
}
|
||||
|
||||
/*
|
||||
* Align the virtual region allocation - maximum alignment is
|
||||
* a section size, minimum is a page size. This helps reduce
|
||||
* fragmentation of the DMA space, and also prevents allocations
|
||||
* smaller than a section from crossing a section boundary.
|
||||
*/
|
||||
bit = fls(size - 1);
|
||||
if (bit > SECTION_SHIFT)
|
||||
bit = SECTION_SHIFT;
|
||||
align = 1 << bit;
|
||||
|
||||
/*
|
||||
* Allocate a virtual address in the consistent mapping region.
|
||||
*/
|
||||
c = arm_vmregion_alloc(&consistent_head, align, size,
|
||||
gfp & ~(__GFP_DMA | __GFP_HIGHMEM), NULL);
|
||||
if (c) {
|
||||
pte_t *pte;
|
||||
int idx = CONSISTENT_PTE_INDEX(c->vm_start);
|
||||
int i = 0;
|
||||
u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1);
|
||||
|
||||
pte = consistent_pte[idx] + off;
|
||||
c->priv = pages;
|
||||
|
||||
do {
|
||||
BUG_ON(!pte_none(*pte));
|
||||
|
||||
set_pte_ext(pte, mk_pte(pages[i], prot), 0);
|
||||
pte++;
|
||||
off++;
|
||||
i++;
|
||||
if (off >= PTRS_PER_PTE) {
|
||||
off = 0;
|
||||
pte = consistent_pte[++idx];
|
||||
}
|
||||
} while (i < count);
|
||||
|
||||
dsb();
|
||||
|
||||
return (void *)c->vm_start;
|
||||
}
|
||||
return area->addr;
|
||||
err:
|
||||
unmap_kernel_range((unsigned long)area->addr, size);
|
||||
vunmap(area->addr);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
|
@ -1230,6 +1068,16 @@ static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t si
|
|||
return 0;
|
||||
}
|
||||
|
||||
static struct page **__iommu_get_pages(void *cpu_addr)
|
||||
{
|
||||
struct vm_struct *area;
|
||||
|
||||
area = find_vm_area(cpu_addr);
|
||||
if (area && (area->flags & VM_ARM_DMA_CONSISTENT))
|
||||
return area->pages;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void *arm_iommu_alloc_attrs(struct device *dev, size_t size,
|
||||
dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
|
||||
{
|
||||
|
|
@ -1248,7 +1096,8 @@ static void *arm_iommu_alloc_attrs(struct device *dev, size_t size,
|
|||
if (*handle == DMA_ERROR_CODE)
|
||||
goto err_buffer;
|
||||
|
||||
addr = __iommu_alloc_remap(pages, size, gfp, prot);
|
||||
addr = __iommu_alloc_remap(pages, size, gfp, prot,
|
||||
__builtin_return_address(0));
|
||||
if (!addr)
|
||||
goto err_mapping;
|
||||
|
||||
|
|
@ -1265,31 +1114,25 @@ static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
|
|||
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
unsigned long uaddr = vma->vm_start;
|
||||
unsigned long usize = vma->vm_end - vma->vm_start;
|
||||
struct page **pages = __iommu_get_pages(cpu_addr);
|
||||
|
||||
vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
|
||||
c = arm_vmregion_find(&consistent_head, (unsigned long)cpu_addr);
|
||||
|
||||
if (c) {
|
||||
struct page **pages = c->priv;
|
||||
if (!pages)
|
||||
return -ENXIO;
|
||||
|
||||
unsigned long uaddr = vma->vm_start;
|
||||
unsigned long usize = vma->vm_end - vma->vm_start;
|
||||
int i = 0;
|
||||
do {
|
||||
int ret = vm_insert_page(vma, uaddr, *pages++);
|
||||
if (ret) {
|
||||
pr_err("Remapping memory failed: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
uaddr += PAGE_SIZE;
|
||||
usize -= PAGE_SIZE;
|
||||
} while (usize > 0);
|
||||
|
||||
do {
|
||||
int ret;
|
||||
|
||||
ret = vm_insert_page(vma, uaddr, pages[i++]);
|
||||
if (ret) {
|
||||
pr_err("Remapping memory, error: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
uaddr += PAGE_SIZE;
|
||||
usize -= PAGE_SIZE;
|
||||
} while (usize > 0);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1300,16 +1143,19 @@ static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
|
|||
void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
|
||||
dma_addr_t handle, struct dma_attrs *attrs)
|
||||
{
|
||||
struct arm_vmregion *c;
|
||||
struct page **pages = __iommu_get_pages(cpu_addr);
|
||||
size = PAGE_ALIGN(size);
|
||||
|
||||
c = arm_vmregion_find(&consistent_head, (unsigned long)cpu_addr);
|
||||
if (c) {
|
||||
struct page **pages = c->priv;
|
||||
__dma_free_remap(cpu_addr, size);
|
||||
__iommu_remove_mapping(dev, handle, size);
|
||||
__iommu_free_buffer(dev, pages, size);
|
||||
if (!pages) {
|
||||
WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
|
||||
return;
|
||||
}
|
||||
|
||||
unmap_kernel_range((unsigned long)cpu_addr, size);
|
||||
vunmap(cpu_addr);
|
||||
|
||||
__iommu_remove_mapping(dev, handle, size);
|
||||
__iommu_free_buffer(dev, pages, size);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -59,6 +59,9 @@ extern void __flush_dcache_page(struct address_space *mapping, struct page *page
|
|||
#define VM_ARM_MTYPE(mt) ((mt) << 20)
|
||||
#define VM_ARM_MTYPE_MASK (0x1f << 20)
|
||||
|
||||
/* consistent regions used by dma_alloc_attrs() */
|
||||
#define VM_ARM_DMA_CONSISTENT 0x20000000
|
||||
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_ZONE_DMA
|
||||
|
|
|
|||
|
|
@ -93,6 +93,7 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size,
|
|||
unsigned long start, unsigned long end,
|
||||
const void *caller);
|
||||
extern struct vm_struct *remove_vm_area(const void *addr);
|
||||
extern struct vm_struct *find_vm_area(const void *addr);
|
||||
|
||||
extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
|
||||
struct page ***pages);
|
||||
|
|
|
|||
10
mm/vmalloc.c
10
mm/vmalloc.c
|
|
@ -1403,7 +1403,15 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
|
|||
-1, GFP_KERNEL, caller);
|
||||
}
|
||||
|
||||
static struct vm_struct *find_vm_area(const void *addr)
|
||||
/**
|
||||
* find_vm_area - find a continuous kernel virtual area
|
||||
* @addr: base address
|
||||
*
|
||||
* Search for the kernel VM area starting at @addr, and return it.
|
||||
* It is up to the caller to do all required locking to keep the returned
|
||||
* pointer valid.
|
||||
*/
|
||||
struct vm_struct *find_vm_area(const void *addr)
|
||||
{
|
||||
struct vmap_area *va;
|
||||
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче