diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/base/dma-contiguous.c | 280 |
2 files changed, 8 insertions, 282 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 88500fed3c7a..4e7f0ff83ae7 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -289,16 +289,6 @@ config CMA_ALIGNMENT If unsure, leave the default value "8". -config CMA_AREAS - int "Maximum count of the CMA device-private areas" - default 7 - help - CMA allows to create CMA areas for particular devices. This parameter - sets the maximum number of such device private CMA areas in the - system. - - If unsure, leave the default value "7". - endif endmenu diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index ad8a85bf852f..0411c1c57005 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -24,25 +24,9 @@ #include <linux/memblock.h> #include <linux/err.h> -#include <linux/mm.h> -#include <linux/mutex.h> -#include <linux/page-isolation.h> #include <linux/sizes.h> -#include <linux/slab.h> -#include <linux/swap.h> -#include <linux/mm_types.h> #include <linux/dma-contiguous.h> -#include <linux/log2.h> - -struct cma { - unsigned long base_pfn; - unsigned long count; - unsigned long *bitmap; - unsigned int order_per_bit; /* Order of pages represented by one bit */ - struct mutex lock; -}; - -struct cma *dma_contiguous_default_area; +#include <linux/cma.h> #ifdef CONFIG_CMA_SIZE_MBYTES #define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES @@ -50,6 +34,8 @@ struct cma *dma_contiguous_default_area; #define CMA_SIZE_MBYTES 0 #endif +struct cma *dma_contiguous_default_area; + /* * Default global CMA area size can be defined in kernel's .config. * This is useful mainly for distro maintainers to create a kernel @@ -156,169 +142,6 @@ void __init dma_contiguous_reserve(phys_addr_t limit) } } -static DEFINE_MUTEX(cma_mutex); - -static unsigned long cma_bitmap_aligned_mask(struct cma *cma, int align_order) -{ - return (1UL << (align_order >> cma->order_per_bit)) - 1; -} - -static unsigned long cma_bitmap_maxno(struct cma *cma) -{ - return cma->count >> cma->order_per_bit; -} - -static unsigned long cma_bitmap_pages_to_bits(struct cma *cma, - unsigned long pages) -{ - return ALIGN(pages, 1UL << cma->order_per_bit) >> cma->order_per_bit; -} - -static void cma_clear_bitmap(struct cma *cma, unsigned long pfn, int count) -{ - unsigned long bitmap_no, bitmap_count; - - bitmap_no = (pfn - cma->base_pfn) >> cma->order_per_bit; - bitmap_count = cma_bitmap_pages_to_bits(cma, count); - - mutex_lock(&cma->lock); - bitmap_clear(cma->bitmap, bitmap_no, bitmap_count); - mutex_unlock(&cma->lock); -} - -static int __init cma_activate_area(struct cma *cma) -{ - int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long); - unsigned long base_pfn = cma->base_pfn, pfn = base_pfn; - unsigned i = cma->count >> pageblock_order; - struct zone *zone; - - cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL); - - if (!cma->bitmap) - return -ENOMEM; - - WARN_ON_ONCE(!pfn_valid(pfn)); - zone = page_zone(pfn_to_page(pfn)); - - do { - unsigned j; - base_pfn = pfn; - for (j = pageblock_nr_pages; j; --j, pfn++) { - WARN_ON_ONCE(!pfn_valid(pfn)); - /* - * alloc_contig_range requires the pfn range - * specified to be in the same zone. Make this - * simple by forcing the entire CMA resv range - * to be in the same zone. - */ - if (page_zone(pfn_to_page(pfn)) != zone) - goto err; - } - init_cma_reserved_pageblock(pfn_to_page(base_pfn)); - } while (--i); - - mutex_init(&cma->lock); - return 0; - -err: - kfree(cma->bitmap); - return -EINVAL; -} - -static struct cma cma_areas[MAX_CMA_AREAS]; -static unsigned cma_area_count; - -static int __init cma_init_reserved_areas(void) -{ - int i; - - for (i = 0; i < cma_area_count; i++) { - int ret = cma_activate_area(&cma_areas[i]); - if (ret) - return ret; - } - - return 0; -} -core_initcall(cma_init_reserved_areas); - -static int __init __dma_contiguous_reserve_area(phys_addr_t size, - phys_addr_t base, phys_addr_t limit, - phys_addr_t alignment, unsigned int order_per_bit, - struct cma **res_cma, bool fixed) -{ - struct cma *cma = &cma_areas[cma_area_count]; - int ret = 0; - - pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n", - __func__, (unsigned long)size, (unsigned long)base, - (unsigned long)limit, (unsigned long)alignment); - - if (cma_area_count == ARRAY_SIZE(cma_areas)) { - pr_err("Not enough slots for CMA reserved regions!\n"); - return -ENOSPC; - } - - if (!size) - return -EINVAL; - - if (alignment && !is_power_of_2(alignment)) - return -EINVAL; - - /* - * Sanitise input arguments. - * Pages both ends in CMA area could be merged into adjacent unmovable - * migratetype page by page allocator's buddy algorithm. In the case, - * you couldn't get a contiguous memory, which is not what we want. - */ - alignment = max(alignment, - (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order)); - base = ALIGN(base, alignment); - size = ALIGN(size, alignment); - limit &= ~(alignment - 1); - - /* size should be aligned with order_per_bit */ - if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit)) - return -EINVAL; - - /* Reserve memory */ - if (base && fixed) { - if (memblock_is_region_reserved(base, size) || - memblock_reserve(base, size) < 0) { - ret = -EBUSY; - goto err; - } - } else { - phys_addr_t addr = memblock_alloc_range(size, alignment, base, - limit); - if (!addr) { - ret = -ENOMEM; - goto err; - } else { - base = addr; - } - } - - /* - * Each reserved area must be initialised later, when more kernel - * subsystems (like slab allocator) are available. - */ - cma->base_pfn = PFN_DOWN(base); - cma->count = size >> PAGE_SHIFT; - cma->order_per_bit = order_per_bit; - *res_cma = cma; - cma_area_count++; - - pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M, - (unsigned long)base); - return 0; - -err: - pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M); - return ret; -} - /** * dma_contiguous_reserve_area() - reserve custom contiguous area * @size: Size of the reserved area (in bytes), @@ -342,77 +165,17 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, { int ret; - ret = __dma_contiguous_reserve_area(size, base, limit, 0, 0, - res_cma, fixed); + ret = cma_declare_contiguous(size, base, limit, 0, 0, res_cma, fixed); if (ret) return ret; /* Architecture specific contiguous memory fixup. */ - dma_contiguous_early_fixup(PFN_PHYS((*res_cma)->base_pfn), - (*res_cma)->count << PAGE_SHIFT); + dma_contiguous_early_fixup(cma_get_base(*res_cma), + cma_get_size(*res_cma)); return 0; } -static struct page *__dma_alloc_from_contiguous(struct cma *cma, int count, - unsigned int align) -{ - unsigned long mask, pfn, start = 0; - unsigned long bitmap_maxno, bitmap_no, bitmap_count; - struct page *page = NULL; - int ret; - - if (!cma || !cma->count) - return NULL; - - pr_debug("%s(cma %p, count %d, align %d)\n", __func__, (void *)cma, - count, align); - - if (!count) - return NULL; - - mask = cma_bitmap_aligned_mask(cma, align); - bitmap_maxno = cma_bitmap_maxno(cma); - bitmap_count = cma_bitmap_pages_to_bits(cma, count); - - for (;;) { - mutex_lock(&cma->lock); - bitmap_no = bitmap_find_next_zero_area(cma->bitmap, - bitmap_maxno, start, bitmap_count, mask); - if (bitmap_no >= bitmap_maxno) { - mutex_unlock(&cma->lock); - break; - } - bitmap_set(cma->bitmap, bitmap_no, bitmap_count); - /* - * It's safe to drop the lock here. We've marked this region for - * our exclusive use. If the migration fails we will take the - * lock again and unmark it. - */ - mutex_unlock(&cma->lock); - - pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit); - mutex_lock(&cma_mutex); - ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA); - mutex_unlock(&cma_mutex); - if (ret == 0) { - page = pfn_to_page(pfn); - break; - } else if (ret != -EBUSY) { - cma_clear_bitmap(cma, pfn, count); - break; - } - cma_clear_bitmap(cma, pfn, count); - pr_debug("%s(): memory range at %p is busy, retrying\n", - __func__, pfn_to_page(pfn)); - /* try again with a bit different memory target */ - start = bitmap_no + mask + 1; - } - - pr_debug("%s(): returned %p\n", __func__, page); - return page; -} - /** * dma_alloc_from_contiguous() - allocate pages from contiguous area * @dev: Pointer to device for which the allocation is performed. @@ -427,35 +190,10 @@ static struct page *__dma_alloc_from_contiguous(struct cma *cma, int count, struct page *dma_alloc_from_contiguous(struct device *dev, int count, unsigned int align) { - struct cma *cma = dev_get_cma_area(dev); - if (align > CONFIG_CMA_ALIGNMENT) align = CONFIG_CMA_ALIGNMENT; - return __dma_alloc_from_contiguous(cma, count, align); -} - -static bool __dma_release_from_contiguous(struct cma *cma, struct page *pages, - int count) -{ - unsigned long pfn; - - if (!cma || !pages) - return false; - - pr_debug("%s(page %p)\n", __func__, (void *)pages); - - pfn = page_to_pfn(pages); - - if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count) - return false; - - VM_BUG_ON(pfn + count > cma->base_pfn + cma->count); - - free_contig_range(pfn, count); - cma_clear_bitmap(cma, pfn, count); - - return true; + return cma_alloc(dev_get_cma_area(dev), count, align); } /** @@ -471,7 +209,5 @@ static bool __dma_release_from_contiguous(struct cma *cma, struct page *pages, bool dma_release_from_contiguous(struct device *dev, struct page *pages, int count) { - struct cma *cma = dev_get_cma_area(dev); - - return __dma_release_from_contiguous(cma, pages, count); + return cma_release(dev_get_cma_area(dev), pages, count); } |