This patch adds support for CMA to dma-mapping subsystem for x86
architecture that uses common pci-dma/pci-nommu implementation. This
allows to test CMA on KVM/QEMU and a lot of common x86 boxes.

Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
CC: Michal Nazarewicz <min...@mina86.com>
---
 arch/x86/Kconfig                      |    1 +
 arch/x86/include/asm/dma-contiguous.h |   13 +++++++++++++
 arch/x86/include/asm/dma-mapping.h    |    4 ++++
 arch/x86/kernel/pci-dma.c             |   18 ++++++++++++++++--
 arch/x86/kernel/pci-nommu.c           |    8 +-------
 arch/x86/kernel/setup.c               |    2 ++
 6 files changed, 37 insertions(+), 9 deletions(-)
 create mode 100644 arch/x86/include/asm/dma-contiguous.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cb9a104..57a7177 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -29,6 +29,7 @@ config X86
        select ARCH_WANT_OPTIONAL_GPIOLIB
        select ARCH_WANT_FRAME_POINTERS
        select HAVE_DMA_ATTRS
+       select HAVE_DMA_CONTIGUOUS if !SWIOTLB
        select HAVE_KRETPROBES
        select HAVE_OPTPROBES
        select HAVE_FTRACE_MCOUNT_RECORD
diff --git a/arch/x86/include/asm/dma-contiguous.h 
b/arch/x86/include/asm/dma-contiguous.h
new file mode 100644
index 0000000..8fb117d
--- /dev/null
+++ b/arch/x86/include/asm/dma-contiguous.h
@@ -0,0 +1,13 @@
+#ifndef ASMX86_DMA_CONTIGUOUS_H
+#define ASMX86_DMA_CONTIGUOUS_H
+
+#ifdef __KERNEL__
+
+#include <linux/device.h>
+#include <linux/dma-contiguous.h>
+#include <asm-generic/dma-contiguous.h>
+
+static inline void dma_contiguous_early_fixup(phys_addr_t base, unsigned long 
size) { }
+
+#endif
+#endif
diff --git a/arch/x86/include/asm/dma-mapping.h 
b/arch/x86/include/asm/dma-mapping.h
index ed3065f..90ac6f0 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -13,6 +13,7 @@
 #include <asm/io.h>
 #include <asm/swiotlb.h>
 #include <asm-generic/dma-coherent.h>
+#include <linux/dma-contiguous.h>
 
 #ifdef CONFIG_ISA
 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
@@ -61,6 +62,9 @@ extern int dma_set_mask(struct device *dev, u64 mask);
 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
                                        dma_addr_t *dma_addr, gfp_t flag);
 
+extern void dma_generic_free_coherent(struct device *dev, size_t size,
+                                     void *vaddr, dma_addr_t dma_addr);
+
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t 
size)
 {
        if (!dev->dma_mask)
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 80dc793..f4abafc 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -90,14 +90,18 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t 
size,
                                 dma_addr_t *dma_addr, gfp_t flag)
 {
        unsigned long dma_mask;
-       struct page *page;
+       struct page *page = NULL;
+       unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
        dma_addr_t addr;
 
        dma_mask = dma_alloc_coherent_mask(dev, flag);
 
        flag |= __GFP_ZERO;
 again:
-       page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
+       if (!(flag & GFP_ATOMIC))
+               page = dma_alloc_from_contiguous(dev, count, get_order(size));
+       if (!page)
+               page = alloc_pages_node(dev_to_node(dev), flag, 
get_order(size));
        if (!page)
                return NULL;
 
@@ -117,6 +121,16 @@ again:
        return page_address(page);
 }
 
+void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
+                              dma_addr_t dma_addr)
+{
+       unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+       struct page *page = virt_to_page(vaddr);
+
+       if (!dma_release_from_contiguous(dev, page, count))
+               free_pages((unsigned long)vaddr, get_order(size));
+}
+
 /*
  * See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel
  * parameter documentation.
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 3af4af8..656566f 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -74,12 +74,6 @@ static int nommu_map_sg(struct device *hwdev, struct 
scatterlist *sg,
        return nents;
 }
 
-static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
-                               dma_addr_t dma_addr)
-{
-       free_pages((unsigned long)vaddr, get_order(size));
-}
-
 static void nommu_sync_single_for_device(struct device *dev,
                        dma_addr_t addr, size_t size,
                        enum dma_data_direction dir)
@@ -97,7 +91,7 @@ static void nommu_sync_sg_for_device(struct device *dev,
 
 struct dma_map_ops nommu_dma_ops = {
        .alloc_coherent         = dma_generic_alloc_coherent,
-       .free_coherent          = nommu_free_coherent,
+       .free_coherent          = dma_generic_free_coherent,
        .map_sg                 = nommu_map_sg,
        .map_page               = nommu_map_page,
        .sync_single_for_device = nommu_sync_single_for_device,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index afaf384..6c9efb5 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -50,6 +50,7 @@
 #include <asm/pci-direct.h>
 #include <linux/init_ohci1394_dma.h>
 #include <linux/kvm_para.h>
+#include <linux/dma-contiguous.h>
 
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -944,6 +945,7 @@ void __init setup_arch(char **cmdline_p)
        }
 #endif
        memblock.current_limit = get_max_mapped();
+       dma_contiguous_reserve(0);
 
        /*
         * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
-- 
1.7.1.569.g6f426

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