Share a common set of swiotlb operations, and to instead branch out in
__phys_to_dma/__dma_to_phys for the PCI vs non-PCI case. Also use const
structures for the PCI methods so that attackers can't use them as
exploit vectors.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/mips/cavium-octeon/dma-octeon.c | 169 ++++++++----------
.../asm/mach-cavium-octeon/dma-coherence.h | 2 -
arch/mips/pci/pci-octeon.c | 2 -
3 files changed, 70 insertions(+), 103 deletions(-)
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index e5d00c79bd26..1e68636c9137 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -23,10 +23,16 @@
#include <asm/octeon/octeon.h>
#ifdef CONFIG_PCI
+#include <linux/pci.h>
#include <asm/octeon/pci-octeon.h>
#include <asm/octeon/cvmx-npi-defs.h>
#include <asm/octeon/cvmx-pci-defs.h>
+struct octeon_dma_map_ops {
+ dma_addr_t (*phys_to_dma)(struct device *dev, phys_addr_t paddr);
+ phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr);
+};
+
static dma_addr_t octeon_hole_phys_to_dma(phys_addr_t paddr)
{
if (paddr >= CVMX_PCIE_BAR1_PHYS_BASE && paddr < (CVMX_PCIE_BAR1_PHYS_BASE + CVMX_PCIE_BAR1_PHYS_SIZE))
@@ -43,6 +49,11 @@ static phys_addr_t octeon_hole_dma_to_phys(dma_addr_t daddr)
return daddr;
}
+static const struct octeon_dma_map_ops octeon_gen2_ops = {
+ .phys_to_dma = octeon_hole_phys_to_dma,
+ .dma_to_phys = octeon_hole_dma_to_phys,
+};
+
static dma_addr_t octeon_gen1_phys_to_dma(struct device *dev, phys_addr_t paddr)
{
if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
@@ -60,15 +71,10 @@ static phys_addr_t octeon_gen1_dma_to_phys(struct device *dev, dma_addr_t daddr)
return daddr;
}
-static dma_addr_t octeon_gen2_phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return octeon_hole_phys_to_dma(paddr);
-}
-
-static phys_addr_t octeon_gen2_dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return octeon_hole_dma_to_phys(daddr);
-}
+static const struct octeon_dma_map_ops octeon_gen1_ops = {
+ .phys_to_dma = octeon_gen1_phys_to_dma,
+ .dma_to_phys = octeon_gen1_dma_to_phys,
+};
static dma_addr_t octeon_big_phys_to_dma(struct device *dev, phys_addr_t paddr)
{
@@ -92,6 +98,11 @@ static phys_addr_t octeon_big_dma_to_phys(struct device *dev, dma_addr_t daddr)
return daddr;
}
+static const struct octeon_dma_map_ops octeon_big_ops = {
+ .phys_to_dma = octeon_big_phys_to_dma,
+ .dma_to_phys = octeon_big_dma_to_phys,
+};
+
static dma_addr_t octeon_small_phys_to_dma(struct device *dev,
phys_addr_t paddr)
{
@@ -120,6 +131,32 @@ static phys_addr_t octeon_small_dma_to_phys(struct device *dev,
return daddr;
}
+static const struct octeon_dma_map_ops octeon_small_ops = {
+ .phys_to_dma = octeon_small_phys_to_dma,
+ .dma_to_phys = octeon_small_dma_to_phys,
+};
+
+static const struct octeon_dma_map_ops *octeon_pci_dma_ops;
+
+void __init octeon_pci_dma_init(void)
+{
+ switch (octeon_dma_bar_type) {
+ case OCTEON_DMA_BAR_TYPE_PCIE2:
+ octeon_pci_dma_ops = &octeon_gen2_ops;
+ break;
+ case OCTEON_DMA_BAR_TYPE_PCIE:
+ octeon_pci_dma_ops = &octeon_gen1_ops;
+ break;
+ case OCTEON_DMA_BAR_TYPE_BIG:
+ octeon_pci_dma_ops = &octeon_big_ops;
+ break;
+ case OCTEON_DMA_BAR_TYPE_SMALL:
+ octeon_pci_dma_ops = &octeon_small_ops;
+ break;
+ default:
+ BUG();
+ }
+}
#endif /* CONFIG_PCI */
static dma_addr_t octeon_dma_map_page(struct device *dev, struct page *page,
@@ -165,57 +202,37 @@ static void *octeon_dma_alloc_coherent(struct device *dev, size_t size,
return ret;
}
-static dma_addr_t octeon_unity_phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-static phys_addr_t octeon_unity_dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
- return daddr;
-}
-
-struct octeon_dma_map_ops {
- const struct dma_map_ops dma_map_ops;
- dma_addr_t (*phys_to_dma)(struct device *dev, phys_addr_t paddr);
- phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr);
-};
-
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
- struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
- struct octeon_dma_map_ops,
- dma_map_ops);
-
- return ops->phys_to_dma(dev, paddr);
+#ifdef CONFIG_PCI
+ if (dev && dev_is_pci(dev))
+ return octeon_pci_dma_ops->phys_to_dma(dev, paddr);
+#endif
+ return paddr;
}
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
{
- struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
- struct octeon_dma_map_ops,
- dma_map_ops);
-
- return ops->dma_to_phys(dev, daddr);
+#ifdef CONFIG_PCI
+ if (dev && dev_is_pci(dev))
+ return octeon_pci_dma_ops->dma_to_phys(dev, daddr);
+#endif
+ return daddr;
}
-static struct octeon_dma_map_ops octeon_linear_dma_map_ops = {
- .dma_map_ops = {
- .alloc = octeon_dma_alloc_coherent,
- .free = swiotlb_free,
- .map_page = octeon_dma_map_page,
- .unmap_page = swiotlb_unmap_page,
- .map_sg = octeon_dma_map_sg,
- .unmap_sg = swiotlb_unmap_sg_attrs,
- .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
- .sync_single_for_device = octeon_dma_sync_single_for_device,
- .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
- .sync_sg_for_device = octeon_dma_sync_sg_for_device,
- .mapping_error = swiotlb_dma_mapping_error,
- .dma_supported = swiotlb_dma_supported
- },
- .phys_to_dma = octeon_unity_phys_to_dma,
- .dma_to_phys = octeon_unity_dma_to_phys
+static const struct dma_map_ops octeon_swiotlb_ops = {
+ .alloc = octeon_dma_alloc_coherent,
+ .free = swiotlb_free,
+ .map_page = octeon_dma_map_page,
+ .unmap_page = swiotlb_unmap_page,
+ .map_sg = octeon_dma_map_sg,
+ .unmap_sg = swiotlb_unmap_sg_attrs,
+ .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+ .sync_single_for_device = octeon_dma_sync_single_for_device,
+ .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+ .sync_sg_for_device = octeon_dma_sync_sg_for_device,
+ .mapping_error = swiotlb_dma_mapping_error,
+ .dma_supported = swiotlb_dma_supported
};
char *octeon_swiotlb;
@@ -281,51 +298,5 @@ void __init plat_swiotlb_setup(void)
if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM)
panic("Cannot allocate SWIOTLB buffer");
- mips_dma_map_ops = &octeon_linear_dma_map_ops.dma_map_ops;
-}
-
-#ifdef CONFIG_PCI
-static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = {
- .dma_map_ops = {
- .alloc = octeon_dma_alloc_coherent,
- .free = swiotlb_free,
- .map_page = octeon_dma_map_page,
- .unmap_page = swiotlb_unmap_page,
- .map_sg = octeon_dma_map_sg,
- .unmap_sg = swiotlb_unmap_sg_attrs,
- .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
- .sync_single_for_device = octeon_dma_sync_single_for_device,
- .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
- .sync_sg_for_device = octeon_dma_sync_sg_for_device,
- .mapping_error = swiotlb_dma_mapping_error,
- .dma_supported = swiotlb_dma_supported
- },
-};
-
-const struct dma_map_ops *octeon_pci_dma_map_ops;
-
-void __init octeon_pci_dma_init(void)
-{
- switch (octeon_dma_bar_type) {
- case OCTEON_DMA_BAR_TYPE_PCIE2:
- _octeon_pci_dma_map_ops.phys_to_dma = octeon_gen2_phys_to_dma;
- _octeon_pci_dma_map_ops.dma_to_phys = octeon_gen2_dma_to_phys;
- break;
- case OCTEON_DMA_BAR_TYPE_PCIE:
- _octeon_pci_dma_map_ops.phys_to_dma = octeon_gen1_phys_to_dma;
- _octeon_pci_dma_map_ops.dma_to_phys = octeon_gen1_dma_to_phys;
- break;
- case OCTEON_DMA_BAR_TYPE_BIG:
- _octeon_pci_dma_map_ops.phys_to_dma = octeon_big_phys_to_dma;
- _octeon_pci_dma_map_ops.dma_to_phys = octeon_big_dma_to_phys;
- break;
- case OCTEON_DMA_BAR_TYPE_SMALL:
- _octeon_pci_dma_map_ops.phys_to_dma = octeon_small_phys_to_dma;
- _octeon_pci_dma_map_ops.dma_to_phys = octeon_small_dma_to_phys;
- break;
- default:
- BUG();
- }
- octeon_pci_dma_map_ops = &_octeon_pci_dma_map_ops.dma_map_ops;
+ mips_dma_map_ops = &octeon_swiotlb_ops;
}
-#endif /* CONFIG_PCI */
diff --git a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
index 6eb1ee548b11..c5cdeea495f8 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
@@ -72,8 +72,6 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr);
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr);
-struct dma_map_ops;
-extern const struct dma_map_ops *octeon_pci_dma_map_ops;
extern char *octeon_swiotlb;
#endif /* __ASM_MACH_CAVIUM_OCTEON_DMA_COHERENCE_H */
diff --git a/arch/mips/pci/pci-octeon.c b/arch/mips/pci/pci-octeon.c
index 3e92a06fa772..a20697df3539 100644
--- a/arch/mips/pci/pci-octeon.c
+++ b/arch/mips/pci/pci-octeon.c
@@ -166,8 +166,6 @@ int pcibios_plat_dev_init(struct pci_dev *dev)
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig);
}
- dev->dev.dma_ops = octeon_pci_dma_map_ops;
-
return 0;
}
--
2.17.0
