1 files changed, 12 insertions, 208 deletions

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 6467c919c509..6606abdf880c 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -24,23 +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>
-
-struct cma {
-        unsigned long   base_pfn;
-        unsigned long   count;
-        unsigned long   *bitmap;
-        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
@@ -48,6 +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
@@ -154,65 +142,6 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
         }
 }
 
-static DEFINE_MUTEX(cma_mutex);
-
-static int __init cma_activate_area(struct cma *cma)
-{
-        int bitmap_size = BITS_TO_LONGS(cma->count) * 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);
-
 /**
  * dma_contiguous_reserve_area() - reserve custom contiguous area
  * @size: Size of the reserved area (in bytes),
@@ -234,72 +163,17 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
                                        phys_addr_t limit, struct cma **res_cma,
                                        bool fixed)
 {
-        struct cma *cma = &cma_areas[cma_area_count];
-        phys_addr_t alignment;
-        int ret = 0;
-
-        pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__,
-                 (unsigned long)size, (unsigned long)base,
-                 (unsigned long)limit);
-
-        /* Sanity checks */
-        if (cma_area_count == ARRAY_SIZE(cma_areas)) {
-                pr_err("Not enough slots for CMA reserved regions!\n");
-                return -ENOSPC;
-        }
-
-        if (!size)
-                return -EINVAL;
-
-        /* Sanitise input arguments */
-        alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
-        base = ALIGN(base, alignment);
-        size = ALIGN(size, alignment);
-        limit &= ~(alignment - 1);
-
-        /* 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;
-        *res_cma = cma;
-        cma_area_count++;
+        int ret;
 
-        pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
-                (unsigned long)base);
+        ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed, res_cma);
+        if (ret)
+                return ret;
 
         /* Architecture specific contiguous memory fixup. */
-        dma_contiguous_early_fixup(base, size);
-        return 0;
-err:
-        pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
-        return ret;
-}
+        dma_contiguous_early_fixup(cma_get_base(*res_cma),
+                                cma_get_size(*res_cma));
 
-static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count)
-{
-        mutex_lock(&cma->lock);
-        bitmap_clear(cma->bitmap, pfn - cma->base_pfn, count);
-        mutex_unlock(&cma->lock);
+        return 0;
 }
 
 /**
@@ -316,62 +190,10 @@ static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count)
 struct page *dma_alloc_from_contiguous(struct device *dev, int count,
                                        unsigned int align)
 {
-        unsigned long mask, pfn, pageno, start = 0;
-        struct cma *cma = dev_get_cma_area(dev);
-        struct page *page = NULL;
-        int ret;
-
-        if (!cma || !cma->count)
-                return NULL;
-
         if (align > CONFIG_CMA_ALIGNMENT)
                 align = CONFIG_CMA_ALIGNMENT;
 
-        pr_debug("%s(cma %p, count %d, align %d)\n", __func__, (void *)cma,
-                 count, align);
-
-        if (!count)
-                return NULL;
-
-        mask = (1 << align) - 1;
-
-
-        for (;;) {
-                mutex_lock(&cma->lock);
-                pageno = bitmap_find_next_zero_area(cma->bitmap, cma->count,
-                                                    start, count, mask);
-                if (pageno >= cma->count) {
-                        mutex_unlock(&cma->lock);
-                        break;
-                }
-                bitmap_set(cma->bitmap, pageno, 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 + pageno;
-                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) {
-                        clear_cma_bitmap(cma, pfn, count);
-                        break;
-                }
-                clear_cma_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 = pageno + mask + 1;
-        }
-
-        pr_debug("%s(): returned %p\n", __func__, page);
-        return page;
+        return cma_alloc(dev_get_cma_area(dev), count, align);
 }
 
 /**
@@ -387,23 +209,5 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
 bool dma_release_from_contiguous(struct device *dev, struct page *pages,
                                  int count)
 {
-        struct cma *cma = dev_get_cma_area(dev);
-        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);
-        clear_cma_bitmap(cma, pfn, count);
-
-        return true;
+        return cma_release(dev_get_cma_area(dev), pages, count);
 }