Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping

Pull DMA mapping updates from Christoph Hellwig:
 "A huge update this time, but a lot of that is just consolidating or
  removing code:

   - provide a common DMA_MAPPING_ERROR definition and avoid indirect
     calls for dma_map_* error checking

   - use direct calls for the DMA direct mapping case, avoiding huge
     retpoline overhead for high performance workloads

   - merge the swiotlb dma_map_ops into dma-direct

   - provide a generic remapping DMA consistent allocator for
     architectures that have devices that perform DMA that is not cache
     coherent. Based on the existing arm64 implementation and also used
     for csky now.

   - improve the dma-debug infrastructure, including dynamic allocation
     of entries (Robin Murphy)

   - default to providing chaining scatterlist everywhere, with opt-outs
     for the few architectures (alpha, parisc, most arm32 variants) that
     can't cope with it

   - misc sparc32 dma-related cleanups

   - remove the dma_mark_clean arch hook used by swiotlb on ia64 and
     replace it with the generic noncoherent infrastructure

   - fix the return type of dma_set_max_seg_size (Niklas Söderlund)

   - move the dummy dma ops for not DMA capable devices from arm64 to
     common code (Robin Murphy)

   - ensure dma_alloc_coherent returns zeroed memory to avoid kernel
     data leaks through userspace. We already did this for most common
     architectures, but this ensures we do it everywhere.
     dma_zalloc_coherent has been deprecated and can hopefully be
     removed after -rc1 with a coccinelle script"

* tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping: (73 commits)
  dma-mapping: fix inverted logic in dma_supported
  dma-mapping: deprecate dma_zalloc_coherent
  dma-mapping: zero memory returned from dma_alloc_*
  sparc/iommu: fix ->map_sg return value
  sparc/io-unit: fix ->map_sg return value
  arm64: default to the direct mapping in get_arch_dma_ops
  PCI: Remove unused attr variable in pci_dma_configure
  ia64: only select ARCH_HAS_DMA_COHERENT_TO_PFN if swiotlb is enabled
  dma-mapping: bypass indirect calls for dma-direct
  vmd: use the proper dma_* APIs instead of direct methods calls
  dma-direct: merge swiotlb_dma_ops into the dma_direct code
  dma-direct: use dma_direct_map_page to implement dma_direct_map_sg
  dma-direct: improve addressability error reporting
  swiotlb: remove dma_mark_clean
  swiotlb: remove SWIOTLB_MAP_ERROR
  ACPI / scan: Refactor _CCA enforcement
  dma-mapping: factor out dummy DMA ops
  dma-mapping: always build the direct mapping code
  dma-mapping: move dma_cache_sync out of line
  dma-mapping: move various slow path functions out of line
  ...

2 files changed, 3 insertions, 142 deletions

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index cb64f8dacd08e..37bed8aadf95b 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -7,8 +7,7 @@ config CSKY
 	select COMMON_CLK
 	select CLKSRC_MMIO
 	select CLKSRC_OF
-	select DMA_DIRECT_OPS
-	select DMA_NONCOHERENT_OPS
+	select DMA_DIRECT_REMAP
 	select IRQ_DOMAIN
 	select HANDLE_DOMAIN_IRQ
 	select DW_APB_TIMER_OF
diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c
index 85437b21e045d..80783bb71c5cb 100644
--- a/arch/csky/mm/dma-mapping.c
+++ b/arch/csky/mm/dma-mapping.c
@@ -14,73 +14,13 @@
 #include <linux/version.h>
 #include <asm/cache.h>
 
-static struct gen_pool *atomic_pool;
-static size_t atomic_pool_size __initdata = SZ_256K;
-
-static int __init early_coherent_pool(char *p)
-{
-	atomic_pool_size = memparse(p, &p);
-	return 0;
-}
-early_param("coherent_pool", early_coherent_pool);
-
 static int __init atomic_pool_init(void)
 {
-	struct page *page;
-	size_t size = atomic_pool_size;
-	void *ptr;
-	int ret;
-
-	atomic_pool = gen_pool_create(PAGE_SHIFT, -1);
-	if (!atomic_pool)
-		BUG();
-
-	page = alloc_pages(GFP_KERNEL | GFP_DMA, get_order(size));
-	if (!page)
-		BUG();
-
-	ptr = dma_common_contiguous_remap(page, size, VM_ALLOC,
-					  pgprot_noncached(PAGE_KERNEL),
-					  __builtin_return_address(0));
-	if (!ptr)
-		BUG();
-
-	ret = gen_pool_add_virt(atomic_pool, (unsigned long)ptr,
-				page_to_phys(page), atomic_pool_size, -1);
-	if (ret)
-		BUG();
-
-	gen_pool_set_algo(atomic_pool, gen_pool_first_fit_order_align, NULL);
-
-	pr_info("DMA: preallocated %zu KiB pool for atomic coherent pool\n",
-		atomic_pool_size / 1024);
-
-	pr_info("DMA: vaddr: 0x%x phy: 0x%lx,\n", (unsigned int)ptr,
-		page_to_phys(page));
-
-	return 0;
+	return dma_atomic_pool_init(GFP_KERNEL, pgprot_noncached(PAGE_KERNEL));
 }
 postcore_initcall(atomic_pool_init);
 
-static void *csky_dma_alloc_atomic(struct device *dev, size_t size,
-				   dma_addr_t *dma_handle)
-{
-	unsigned long addr;
-
-	addr = gen_pool_alloc(atomic_pool, size);
-	if (addr)
-		*dma_handle = gen_pool_virt_to_phys(atomic_pool, addr);
-
-	return (void *)addr;
-}
-
-static void csky_dma_free_atomic(struct device *dev, size_t size, void *vaddr,
-				 dma_addr_t dma_handle, unsigned long attrs)
-{
-	gen_pool_free(atomic_pool, (unsigned long)vaddr, size);
-}
-
-static void __dma_clear_buffer(struct page *page, size_t size)
+void arch_dma_prep_coherent(struct page *page, size_t size)
 {
 	if (PageHighMem(page)) {
 		unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
@@ -107,84 +47,6 @@ static void __dma_clear_buffer(struct page *page, size_t size)
 	}
 }
 
-static void *csky_dma_alloc_nonatomic(struct device *dev, size_t size,
-				      dma_addr_t *dma_handle, gfp_t gfp,
-				      unsigned long attrs)
-{
-	void  *vaddr;
-	struct page *page;
-	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-
-	if (DMA_ATTR_NON_CONSISTENT & attrs) {
-		pr_err("csky %s can't support DMA_ATTR_NON_CONSISTENT.\n", __func__);
-		return NULL;
-	}
-
-	if (IS_ENABLED(CONFIG_DMA_CMA))
-		page = dma_alloc_from_contiguous(dev, count, get_order(size),
-						 gfp);
-	else
-		page = alloc_pages(gfp, get_order(size));
-
-	if (!page) {
-		pr_err("csky %s no more free pages.\n", __func__);
-		return NULL;
-	}
-
-	*dma_handle = page_to_phys(page);
-
-	__dma_clear_buffer(page, size);
-
-	if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
-		return page;
-
-	vaddr = dma_common_contiguous_remap(page, PAGE_ALIGN(size), VM_USERMAP,
-		pgprot_noncached(PAGE_KERNEL), __builtin_return_address(0));
-	if (!vaddr)
-		BUG();
-
-	return vaddr;
-}
-
-static void csky_dma_free_nonatomic(
-	struct device *dev,
-	size_t size,
-	void *vaddr,
-	dma_addr_t dma_handle,
-	unsigned long attrs
-	)
-{
-	struct page *page = phys_to_page(dma_handle);
-	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-
-	if ((unsigned int)vaddr >= VMALLOC_START)
-		dma_common_free_remap(vaddr, size, VM_USERMAP);
-
-	if (IS_ENABLED(CONFIG_DMA_CMA))
-		dma_release_from_contiguous(dev, page, count);
-	else
-		__free_pages(page, get_order(size));
-}
-
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		     gfp_t gfp, unsigned long attrs)
-{
-	if (gfpflags_allow_blocking(gfp))
-		return csky_dma_alloc_nonatomic(dev, size, dma_handle, gfp,
-						attrs);
-	else
-		return csky_dma_alloc_atomic(dev, size, dma_handle);
-}
-
-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
-		   dma_addr_t dma_handle, unsigned long attrs)
-{
-	if (!addr_in_gen_pool(atomic_pool, (unsigned int) vaddr, size))
-		csky_dma_free_nonatomic(dev, size, vaddr, dma_handle, attrs);
-	else
-		csky_dma_free_atomic(dev, size, vaddr, dma_handle, attrs);
-}
-
 static inline void cache_op(phys_addr_t paddr, size_t size,
 			    void (*fn)(unsigned long start, unsigned long end))
 {