[PATCH 5/7] MIPS: use the generic uncached segment support in dma-direct

[Christoph Hellwig]

Stop providing our arch alloc/free hooks and just expose the segment
offset instead.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 arch/mips/Kconfig              |  1 +
 arch/mips/include/asm/page.h   |  3 ---
 arch/mips/jazz/jazzdma.c       |  6 ------
 arch/mips/mm/dma-noncoherent.c | 27 ++++++++++-----------------
 4 files changed, 11 insertions(+), 26 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4a5f5b0ee9a9..cde4b490f3c7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -9,6 +9,7 @@ config MIPS
        select ARCH_HAS_ELF_RANDOMIZE
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_HAS_UBSAN_SANITIZE_ALL
+       select ARCH_HAS_UNCACHED_SEGMENT
        select ARCH_SUPPORTS_UPROBES
        select ARCH_USE_BUILTIN_BSWAP
        select ARCH_USE_CMPXCHG_LOCKREF if 64BIT
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index 6b31c93b5eaa..23e0f1386e04 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -258,9 +258,6 @@ extern int __virt_addr_valid(const volatile void *kaddr);
         ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
-#define UNCAC_ADDR(addr)       (UNCAC_BASE + __pa(addr))
-#define CAC_ADDR(addr)         ((unsigned long)__va((addr) - UNCAC_BASE))
-
 #include <asm-generic/memory_model.h>
 #include <asm-generic/getorder.h>
 
diff --git a/arch/mips/jazz/jazzdma.c b/arch/mips/jazz/jazzdma.c
index bedb5047aff3..1804dc9d8136 100644
--- a/arch/mips/jazz/jazzdma.c
+++ b/arch/mips/jazz/jazzdma.c
@@ -575,10 +575,6 @@ static void *jazz_dma_alloc(struct device *dev, size_t 
size,
                return NULL;
        }
 
-       if (!(attrs & DMA_ATTR_NON_CONSISTENT)) {
-               dma_cache_wback_inv((unsigned long)ret, size);
-               ret = (void *)UNCAC_ADDR(ret);
-       }
        return ret;
 }
 
@@ -586,8 +582,6 @@ static void jazz_dma_free(struct device *dev, size_t size, 
void *vaddr,
                dma_addr_t dma_handle, unsigned long attrs)
 {
        vdma_free(dma_handle);
-       if (!(attrs & DMA_ATTR_NON_CONSISTENT))
-               vaddr = (void *)CAC_ADDR((unsigned long)vaddr);
        dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs);
 }
 
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
index f9549d2fbea3..f739f42c9d3c 100644
--- a/arch/mips/mm/dma-noncoherent.c
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -44,33 +44,26 @@ static inline bool cpu_needs_post_dma_flush(struct device 
*dev)
        }
 }
 
-void *arch_dma_alloc(struct device *dev, size_t size,
-               dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+void arch_dma_prep_coherent(struct page *page, size_t size)
 {
-       void *ret;
-
-       ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
-       if (ret && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
-               dma_cache_wback_inv((unsigned long) ret, size);
-               ret = (void *)UNCAC_ADDR(ret);
-       }
+       if (!PageHighMem(page))
+               dma_cache_wback_inv((unsigned long)page_address(page), size);
+}
 
-       return ret;
+void *uncached_kernel_address(void *addr)
+{
+       return (void *)(__pa(addr) + UNCAC_BASE);
 }
 
-void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
-               dma_addr_t dma_addr, unsigned long attrs)
+void *cached_kernel_address(void *addr)
 {
-       if (!(attrs & DMA_ATTR_NON_CONSISTENT))
-               cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr);
-       dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
+       return __va(addr) - UNCAC_BASE;
 }
 
 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
                dma_addr_t dma_addr)
 {
-       unsigned long addr = CAC_ADDR((unsigned long)cpu_addr);
-       return page_to_pfn(virt_to_page((void *)addr));
+       return page_to_pfn(virt_to_page(cached_kernel_address(cpu_addr)));
 }
 
 pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
-- 
2.20.1

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