diff mbox series

[03/11] xen/arm: pass one less argument to dma_cache_maint

Message ID 20190816130013.31154-4-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [01/11] xen/arm: use dma-noncoherent.h calls for xen-swiotlb cache maintainance | expand

Commit Message

Christoph Hellwig Aug. 16, 2019, 1 p.m. UTC 
Instead of taking apart the dma address in both callers do it inside
dma_cache_maint itself.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/xen/mm.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Comments

Robin Murphy Aug. 16, 2019, 1:37 p.m. UTC | #1 
On 16/08/2019 14:00, Christoph Hellwig wrote:
> Instead of taking apart the dma address in both callers do it inside
> dma_cache_maint itself.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   arch/arm/xen/mm.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
> index 90574d89d0d4..d9da24fda2f7 100644
> --- a/arch/arm/xen/mm.c
> +++ b/arch/arm/xen/mm.c
> @@ -43,13 +43,15 @@ static bool hypercall_cflush = false;
>   
>   /* functions called by SWIOTLB */
>   
> -static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
> -	size_t size, enum dma_data_direction dir, enum dma_cache_op op)
> +static void dma_cache_maint(dma_addr_t handle, size_t size,
> +		enum dma_data_direction dir, enum dma_cache_op op)
>   {
>   	struct gnttab_cache_flush cflush;
>   	unsigned long xen_pfn;
> +	unsigned long offset = handle & ~PAGE_MASK;
>   	size_t left = size;
>   
> +	offset &= PAGE_MASK;

Ahem... presumably that should be handle, not offset.

Robin.

>   	xen_pfn = (handle >> XEN_PAGE_SHIFT) + offset / XEN_PAGE_SIZE;
>   	offset %= XEN_PAGE_SIZE;
>   
> @@ -86,13 +88,13 @@ static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
>   static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle,
>   		size_t size, enum dma_data_direction dir)
>   {
> -	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP);
> +	dma_cache_maint(handle, size, dir, DMA_UNMAP);
>   }
>   
>   static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle,
>   		size_t size, enum dma_data_direction dir)
>   {
> -	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP);
> +	dma_cache_maint(handle, size, dir, DMA_MAP);
>   }
>   
>   void __xen_dma_map_page(struct device *hwdev, struct page *page,
>
Christoph Hellwig Aug. 16, 2019, 4:43 p.m. UTC | #2 
On Fri, Aug 16, 2019 at 02:37:58PM +0100, Robin Murphy wrote:
> On 16/08/2019 14:00, Christoph Hellwig wrote:
>> Instead of taking apart the dma address in both callers do it inside
>> dma_cache_maint itself.
>>
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> ---
>>   arch/arm/xen/mm.c | 10 ++++++----
>>   1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
>> index 90574d89d0d4..d9da24fda2f7 100644
>> --- a/arch/arm/xen/mm.c
>> +++ b/arch/arm/xen/mm.c
>> @@ -43,13 +43,15 @@ static bool hypercall_cflush = false;
>>     /* functions called by SWIOTLB */
>>   -static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
>> -	size_t size, enum dma_data_direction dir, enum dma_cache_op op)
>> +static void dma_cache_maint(dma_addr_t handle, size_t size,
>> +		enum dma_data_direction dir, enum dma_cache_op op)
>>   {
>>   	struct gnttab_cache_flush cflush;
>>   	unsigned long xen_pfn;
>> +	unsigned long offset = handle & ~PAGE_MASK;
>>   	size_t left = size;
>>   +	offset &= PAGE_MASK;
>
> Ahem... presumably that should be handle, not offset.

Ooops, yes.
diff mbox series

Patch

diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 90574d89d0d4..d9da24fda2f7 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -43,13 +43,15 @@  static bool hypercall_cflush = false;
 
 /* functions called by SWIOTLB */
 
-static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
-	size_t size, enum dma_data_direction dir, enum dma_cache_op op)
+static void dma_cache_maint(dma_addr_t handle, size_t size,
+		enum dma_data_direction dir, enum dma_cache_op op)
 {
 	struct gnttab_cache_flush cflush;
 	unsigned long xen_pfn;
+	unsigned long offset = handle & ~PAGE_MASK;
 	size_t left = size;
 
+	offset &= PAGE_MASK;
 	xen_pfn = (handle >> XEN_PAGE_SHIFT) + offset / XEN_PAGE_SIZE;
 	offset %= XEN_PAGE_SIZE;
 
@@ -86,13 +88,13 @@  static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
 static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle,
 		size_t size, enum dma_data_direction dir)
 {
-	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP);
+	dma_cache_maint(handle, size, dir, DMA_UNMAP);
 }
 
 static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle,
 		size_t size, enum dma_data_direction dir)
 {
-	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP);
+	dma_cache_maint(handle, size, dir, DMA_MAP);
 }
 
 void __xen_dma_map_page(struct device *hwdev, struct page *page,