diff options
| -rw-r--r-- | arch/arm/include/asm/dma-mapping.h | 7 | ||||
| -rw-r--r-- | arch/arm/include/asm/memory.h | 9 | ||||
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 49 | ||||
| -rw-r--r-- | arch/arm/mm/init.c | 9 |
4 files changed, 45 insertions, 29 deletions
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 7a21d0bf7134..7f27fab9d404 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -205,6 +205,13 @@ extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *, int dma_mmap_writecombine(struct device *, struct vm_area_struct *, void *, dma_addr_t, size_t); +/* + * This can be called during boot to increase the size of the consistent + * DMA region above it's default value of 2MB. It must be called before the + * memory allocator is initialised, i.e. before any core_initcall. + */ +extern void __init init_consistent_dma_size(unsigned long size); + #ifdef CONFIG_DMABOUNCE /* diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index b8de516e600e..652fccca4952 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -77,16 +77,7 @@ */ #define IOREMAP_MAX_ORDER 24 -/* - * Size of DMA-consistent memory region. Must be multiple of 2M, - * between 2MB and 14MB inclusive. - */ -#ifndef CONSISTENT_DMA_SIZE -#define CONSISTENT_DMA_SIZE SZ_2M -#endif - #define CONSISTENT_END (0xffe00000UL) -#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE) #else /* CONFIG_MMU */ diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 0a0a1e7c20d2..5b59ce572877 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -18,12 +18,14 @@ #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/highmem.h> +#include <linux/slab.h> #include <asm/memory.h> #include <asm/highmem.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <asm/sizes.h> +#include <asm/mach/arch.h> #include "mm.h" @@ -117,26 +119,41 @@ static void __dma_free_buffer(struct page *page, size_t size) } #ifdef CONFIG_MMU -/* Sanity check size */ -#if (CONSISTENT_DMA_SIZE % SZ_2M) -#error "CONSISTENT_DMA_SIZE must be multiple of 2MiB" -#endif -#define CONSISTENT_OFFSET(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PAGE_SHIFT) -#define CONSISTENT_PTE_INDEX(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PGDIR_SHIFT) -#define NUM_CONSISTENT_PTES (CONSISTENT_DMA_SIZE >> PGDIR_SHIFT) + +#define CONSISTENT_OFFSET(x) (((unsigned long)(x) - consistent_base) >> PAGE_SHIFT) +#define CONSISTENT_PTE_INDEX(x) (((unsigned long)(x) - consistent_base) >> PGDIR_SHIFT) /* * These are the page tables (2MB each) covering uncached, DMA consistent allocations */ -static pte_t *consistent_pte[NUM_CONSISTENT_PTES]; +static pte_t **consistent_pte; + +#ifdef CONSISTENT_DMA_SIZE +#define DEFAULT_CONSISTENT_DMA_SIZE CONSISTENT_DMA_SIZE +#else +#define DEFAULT_CONSISTENT_DMA_SIZE SZ_2M +#endif + +unsigned long consistent_base = CONSISTENT_END - DEFAULT_CONSISTENT_DMA_SIZE; + +void __init init_consistent_dma_size(unsigned long size) +{ + unsigned long base = CONSISTENT_END - ALIGN(size, SZ_2M); + + BUG_ON(consistent_pte); /* Check we're called before DMA region init */ + BUG_ON(base < VMALLOC_END); + + /* Grow region to accommodate specified size */ + if (base < consistent_base) + consistent_base = base; +} #include "vmregion.h" static struct arm_vmregion_head consistent_head = { .vm_lock = __SPIN_LOCK_UNLOCKED(&consistent_head.vm_lock), .vm_list = LIST_HEAD_INIT(consistent_head.vm_list), - .vm_start = CONSISTENT_BASE, .vm_end = CONSISTENT_END, }; @@ -155,7 +172,17 @@ static int __init consistent_init(void) pmd_t *pmd; pte_t *pte; int i = 0; - u32 base = CONSISTENT_BASE; + unsigned long base = consistent_base; + unsigned long num_ptes = (CONSISTENT_END - base) >> PGDIR_SHIFT; + + consistent_pte = kmalloc(num_ptes * sizeof(pte_t), GFP_KERNEL); + if (!consistent_pte) { + pr_err("%s: no memory\n", __func__); + return -ENOMEM; + } + + pr_debug("DMA memory: 0x%08lx - 0x%08lx:\n", base, CONSISTENT_END); + consistent_head.vm_start = base; do { pgd = pgd_offset(&init_mm, base); @@ -198,7 +225,7 @@ __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot) size_t align; int bit; - if (!consistent_pte[0]) { + if (!consistent_pte) { printk(KERN_ERR "%s: not initialised\n", __func__); dump_stack(); return NULL; diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 91bca355cd31..64ab41348f30 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -653,9 +653,6 @@ void __init mem_init(void) " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" #endif " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#ifdef CONFIG_MMU - " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" -#endif " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" #ifdef CONFIG_HIGHMEM @@ -674,9 +671,6 @@ void __init mem_init(void) MLK(ITCM_OFFSET, (unsigned long) itcm_end), #endif MLK(FIXADDR_START, FIXADDR_TOP), -#ifdef CONFIG_MMU - MLM(CONSISTENT_BASE, CONSISTENT_END), -#endif MLM(VMALLOC_START, VMALLOC_END), MLM(PAGE_OFFSET, (unsigned long)high_memory), #ifdef CONFIG_HIGHMEM @@ -699,9 +693,6 @@ void __init mem_init(void) * be detected at build time already. */ #ifdef CONFIG_MMU - BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); - BUG_ON(VMALLOC_END > CONSISTENT_BASE); - BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); BUG_ON(TASK_SIZE > MODULES_VADDR); #endif |