[PATCH] Always use virt_to_phys() when translating kernel addresses

[PATCH] Always use virt_to_phys() when translating kernel addresses

[Franck Bui-Huu]

From: Franck Bui-Huu <fbuihuu@gmail.com>

This patch fixes two places where we used plain 'x - PAGE_OFFSET' to
achieve virtual to physical address convertion. This type of convertion
is no more allowed since commit 6f284a2ce7b8bc49cb8455b1763357897a899abb.

Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
---

 Ralf,

 Could you apply this patch. Unfortunately I failed to report back these
 changes when submitting the original patch, and without it, platforms
 which are using (or trying to use) PHYS_OFFSET will break.

 Thanks,
		Franck

 include/asm-mips/pgtable-64.h |    2 +-
 include/asm-mips/pgtable.h    |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/asm-mips/pgtable-64.h b/include/asm-mips/pgtable-64.h
index a5b1871..49f5a1a 100644
--- a/include/asm-mips/pgtable-64.h
+++ b/include/asm-mips/pgtable-64.h
@@ -199,7 +199,7 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 {
 	return pud_val(pud);
 }
-#define pud_phys(pud)		(pud_val(pud) - PAGE_OFFSET)
+#define pud_phys(pud)		virt_to_phys((void *)pud_val(pud))
 #define pud_page(pud)		(pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
 
 /* Find an entry in the second-level page table.. */
diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 3fcfd79..0d3295f 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -75,7 +75,7 @@ extern void paging_init(void);
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
  */
-#define pmd_phys(pmd)		(pmd_val(pmd) - PAGE_OFFSET)
+#define pmd_phys(pmd)		virt_to_phys((void *)pmd_val(pmd))
 #define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 #define pmd_page_vaddr(pmd)	pmd_val(pmd)
 
-- 
1.4.4.3.ge6d4

Re: [PATCH] Always use virt_to_phys() when translating kernel addresses

[Maxime Bizon]

On Mon, 2007-03-19 at 10:41 +0100, Franck Bui-Huu wrote:

Hi Franck,

> This patch fixes two places where we used plain 'x - PAGE_OFFSET' to
> achieve virtual to physical address convertion. This type of convertion
> is no more allowed since commit 6f284a2ce7b8bc49cb8455b1763357897a899abb.

I think you should also review arch/mips/mm/dma-noncoherent.c, it seems
to use PAGE_OFFSET directly in dma_unmap_single. I'm using OWN_DMA so
this code is not used on my board.
 
Regards,

-- 
Maxime

Re: [PATCH] Always use virt_to_phys() when translating kernel addresses

[Franck Bui-Huu]

On 3/19/07, Maxime Bizon <mbizon@freebox.fr> wrote:
>
> On Mon, 2007-03-19 at 10:41 +0100, Franck Bui-Huu wrote:
>
> Hi Franck,
>
> > This patch fixes two places where we used plain 'x - PAGE_OFFSET' to
> > achieve virtual to physical address convertion. This type of convertion
> > is no more allowed since commit 6f284a2ce7b8bc49cb8455b1763357897a899abb.
>
> I think you should also review arch/mips/mm/dma-noncoherent.c, it seems

dma-noncoherent.c has been removed since commit
9a88cbb5227970757881b1a65be01dea61fe2584. But you're right the new
'dma-default.c' still needs to be fixed...
-- 
               Franck

[PATCH] Always use virt_to_phys() when translating kernel addresses [take #2]

[Franck Bui-Huu]

From: Franck Bui-Huu <fbuihuu@gmail.com>

This patch fixes two places where we used plain 'x - PAGE_OFFSET' to
achieve virtual to physical address convertions. This type of convertion
is no more allowed since commit 6f284a2ce7b8bc49cb8455b1763357897a899abb.

Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
---
 arch/mips/mm/dma-default.c                    |   10 +++++-----
 include/asm-mips/mach-generic/dma-coherence.h |    7 +++++++
 include/asm-mips/pgtable-64.h                 |    2 +-
 include/asm-mips/pgtable.h                    |    2 +-
 4 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index f503d02..e1a58b5 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -140,7 +140,7 @@ void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 	enum dma_data_direction direction)
 {
 	if (cpu_is_noncoherent_r10000(dev))
-		__dma_sync(plat_dma_addr_to_phys(dma_addr) + PAGE_OFFSET, size,
+		__dma_sync(plat_dma_addr_to_virt(dma_addr), size,
 		           direction);
 
 	plat_unmap_dma_mem(dma_addr);
@@ -234,7 +234,7 @@ void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 	if (cpu_is_noncoherent_r10000(dev)) {
 		unsigned long addr;
 
-		addr = PAGE_OFFSET + plat_dma_addr_to_phys(dma_handle);
+		addr = plat_dma_addr_to_virt(dma_handle);
 		__dma_sync(addr, size, direction);
 	}
 }
@@ -249,7 +249,7 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;
 
-		addr = PAGE_OFFSET + plat_dma_addr_to_phys(dma_handle);
+		addr = plat_dma_addr_to_virt(dma_handle);
 		__dma_sync(addr, size, direction);
 	}
 }
@@ -264,7 +264,7 @@ void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 	if (cpu_is_noncoherent_r10000(dev)) {
 		unsigned long addr;
 
-		addr = PAGE_OFFSET + plat_dma_addr_to_phys(dma_handle);
+		addr = plat_dma_addr_to_virt(dma_handle);
 		__dma_sync(addr + offset, size, direction);
 	}
 }
@@ -279,7 +279,7 @@ void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 	if (!plat_device_is_coherent(dev)) {
 		unsigned long addr;
 
-		addr = PAGE_OFFSET + plat_dma_addr_to_phys(dma_handle);
+		addr = plat_dma_addr_to_virt(dma_handle);
 		__dma_sync(addr + offset, size, direction);
 	}
 }
diff --git a/include/asm-mips/mach-generic/dma-coherence.h b/include/asm-mips/mach-generic/dma-coherence.h
index 76e04e7..3a2ac54 100644
--- a/include/asm-mips/mach-generic/dma-coherence.h
+++ b/include/asm-mips/mach-generic/dma-coherence.h
@@ -28,6 +28,13 @@ static inline unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
 	return dma_addr;
 }
 
+static inline unsigned long plat_dma_addr_to_virt(dma_addr_t dma_addr)
+{
+	unsigned long addr = plat_dma_addr_to_phys(dma_addr);
+
+	return (unsigned long)phys_to_virt(addr);
+}
+
 static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)
 {
 }
diff --git a/include/asm-mips/pgtable-64.h b/include/asm-mips/pgtable-64.h
index a5b1871..49f5a1a 100644
--- a/include/asm-mips/pgtable-64.h
+++ b/include/asm-mips/pgtable-64.h
@@ -199,7 +199,7 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 {
 	return pud_val(pud);
 }
-#define pud_phys(pud)		(pud_val(pud) - PAGE_OFFSET)
+#define pud_phys(pud)		virt_to_phys((void *)pud_val(pud))
 #define pud_page(pud)		(pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
 
 /* Find an entry in the second-level page table.. */
diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 3fcfd79..0d3295f 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -75,7 +75,7 @@ extern void paging_init(void);
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
  */
-#define pmd_phys(pmd)		(pmd_val(pmd) - PAGE_OFFSET)
+#define pmd_phys(pmd)		virt_to_phys((void *)pmd_val(pmd))
 #define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 #define pmd_page_vaddr(pmd)	pmd_val(pmd)
 
-- 
1.4.4.3.ge6d4

Re: [PATCH] Always use virt_to_phys() when translating kernel addresses [take #2]

[Ralf Baechle]

On Mon, Mar 19, 2007 at 05:36:42PM +0100, Franck Bui-Huu wrote:

> diff --git a/include/asm-mips/mach-generic/dma-coherence.h b/include/asm-mips/mach-generic/dma-coherence.h
> index 76e04e7..3a2ac54 100644
> --- a/include/asm-mips/mach-generic/dma-coherence.h
> +++ b/include/asm-mips/mach-generic/dma-coherence.h
> @@ -28,6 +28,13 @@ static inline unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
>  	return dma_addr;
>  }
>  
> +static inline unsigned long plat_dma_addr_to_virt(dma_addr_t dma_addr)
> +{
> +	unsigned long addr = plat_dma_addr_to_phys(dma_addr);
> +
> +	return (unsigned long)phys_to_virt(addr);
> +}
> +

Putting this function into include/asm-mips/mach-generic/dma-coherence.h
breaks the build for all machines that don't include this header.  I
applied your patch with this issue fixed.

  Ralf