diff mbox series

[RFC,5/6] arm/xen: Introduce xen_setup_dma_ops()

Message ID 1649963973-22879-6-git-send-email-olekstysh@gmail.com (mailing list archive)
State New, archived
Headers show
Series virtio: Solution to restrict memory access under Xen using xen-virtio DMA ops layer | expand

Commit Message

Oleksandr Tyshchenko April 14, 2022, 7:19 p.m. UTC 
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>

This patch introduces new helper and places it in new header.
The helper's purpose is to assign any Xen specific DMA ops in
a single place. For now, we deal with xen-swiotlb DMA ops only.
The subsequent patch will add xen-virtio DMA ops case.

Also re-use the xen_swiotlb_detect() check on Arm32.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
---
 arch/arm/include/asm/xen/xen-ops.h   |  1 +
 arch/arm/mm/dma-mapping.c            |  5 ++---
 arch/arm64/include/asm/xen/xen-ops.h |  1 +
 arch/arm64/mm/dma-mapping.c          |  5 ++---
 include/xen/arm/xen-ops.h            | 13 +++++++++++++
 5 files changed, 19 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm/include/asm/xen/xen-ops.h
 create mode 100644 arch/arm64/include/asm/xen/xen-ops.h
 create mode 100644 include/xen/arm/xen-ops.h

Comments

Stefano Stabellini April 15, 2022, 10:02 p.m. UTC | #1 
On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> 
> This patch introduces new helper and places it in new header.
> The helper's purpose is to assign any Xen specific DMA ops in
> a single place. For now, we deal with xen-swiotlb DMA ops only.
> The subsequent patch will add xen-virtio DMA ops case.
> 
> Also re-use the xen_swiotlb_detect() check on Arm32.

Thanks for the patch, this is good to have in any case. I would move it
to the beginning of the series.


> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> ---
>  arch/arm/include/asm/xen/xen-ops.h   |  1 +
>  arch/arm/mm/dma-mapping.c            |  5 ++---
>  arch/arm64/include/asm/xen/xen-ops.h |  1 +
>  arch/arm64/mm/dma-mapping.c          |  5 ++---
>  include/xen/arm/xen-ops.h            | 13 +++++++++++++
>  5 files changed, 19 insertions(+), 6 deletions(-)
>  create mode 100644 arch/arm/include/asm/xen/xen-ops.h
>  create mode 100644 arch/arm64/include/asm/xen/xen-ops.h
>  create mode 100644 include/xen/arm/xen-ops.h
> 
> diff --git a/arch/arm/include/asm/xen/xen-ops.h b/arch/arm/include/asm/xen/xen-ops.h
> new file mode 100644
> index 00000000..8d2fa24
> --- /dev/null
> +++ b/arch/arm/include/asm/xen/xen-ops.h
> @@ -0,0 +1 @@
> +#include <xen/arm/xen-ops.h>
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 82ffac6..a1bf9dd 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -33,7 +33,7 @@
>  #include <asm/dma-iommu.h>
>  #include <asm/mach/map.h>
>  #include <asm/system_info.h>
> -#include <xen/swiotlb-xen.h>
> +#include <asm/xen/xen-ops.h>
>  
>  #include "dma.h"
>  #include "mm.h"
> @@ -2288,8 +2288,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>  	set_dma_ops(dev, dma_ops);
>  
>  #ifdef CONFIG_XEN
> -	if (xen_initial_domain())
> -		dev->dma_ops = &xen_swiotlb_dma_ops;
> +	xen_setup_dma_ops(dev);
>  #endif

You can take this opportunity to also remove the #ifdef, by providing an
empty stub implemention of xen_setup_dma_ops for the !CONFIG_XEN case.


>  	dev->archdata.dma_ops_setup = true;
>  }
> diff --git a/arch/arm64/include/asm/xen/xen-ops.h b/arch/arm64/include/asm/xen/xen-ops.h
> new file mode 100644
> index 00000000..8d2fa24
> --- /dev/null
> +++ b/arch/arm64/include/asm/xen/xen-ops.h
> @@ -0,0 +1 @@
> +#include <xen/arm/xen-ops.h>
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index 6719f9e..831e673 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -9,9 +9,9 @@
>  #include <linux/dma-map-ops.h>
>  #include <linux/dma-iommu.h>
>  #include <xen/xen.h>
> -#include <xen/swiotlb-xen.h>
>  
>  #include <asm/cacheflush.h>
> +#include <asm/xen/xen-ops.h>
>  
>  void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
>  		enum dma_data_direction dir)
> @@ -53,7 +53,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>  		iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
>  
>  #ifdef CONFIG_XEN
> -	if (xen_swiotlb_detect())
> -		dev->dma_ops = &xen_swiotlb_dma_ops;
> +	xen_setup_dma_ops(dev);
>  #endif

same here


>  }
> diff --git a/include/xen/arm/xen-ops.h b/include/xen/arm/xen-ops.h
> new file mode 100644
> index 00000000..621da05
> --- /dev/null
> +++ b/include/xen/arm/xen-ops.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_ARM_XEN_OPS_H
> +#define _ASM_ARM_XEN_OPS_H
> +
> +#include <xen/swiotlb-xen.h>
> +
> +static inline void xen_setup_dma_ops(struct device *dev)
> +{
> +	if (xen_swiotlb_detect())
> +		dev->dma_ops = &xen_swiotlb_dma_ops;
> +}
> +
> +#endif /* _ASM_ARM_XEN_OPS_H */
> -- 
> 2.7.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
Oleksandr Tyshchenko April 17, 2022, 6:43 p.m. UTC | #2 
On 16.04.22 01:02, Stefano Stabellini wrote:

Hello Stefano

> On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>>
>> This patch introduces new helper and places it in new header.
>> The helper's purpose is to assign any Xen specific DMA ops in
>> a single place. For now, we deal with xen-swiotlb DMA ops only.
>> The subsequent patch will add xen-virtio DMA ops case.
>>
>> Also re-use the xen_swiotlb_detect() check on Arm32.
> Thanks for the patch, this is good to have in any case. I would move it
> to the beginning of the series.


ok, will move


>
>
>> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>> ---
>>   arch/arm/include/asm/xen/xen-ops.h   |  1 +
>>   arch/arm/mm/dma-mapping.c            |  5 ++---
>>   arch/arm64/include/asm/xen/xen-ops.h |  1 +
>>   arch/arm64/mm/dma-mapping.c          |  5 ++---
>>   include/xen/arm/xen-ops.h            | 13 +++++++++++++
>>   5 files changed, 19 insertions(+), 6 deletions(-)
>>   create mode 100644 arch/arm/include/asm/xen/xen-ops.h
>>   create mode 100644 arch/arm64/include/asm/xen/xen-ops.h
>>   create mode 100644 include/xen/arm/xen-ops.h
>>
>> diff --git a/arch/arm/include/asm/xen/xen-ops.h b/arch/arm/include/asm/xen/xen-ops.h
>> new file mode 100644
>> index 00000000..8d2fa24
>> --- /dev/null
>> +++ b/arch/arm/include/asm/xen/xen-ops.h
>> @@ -0,0 +1 @@
>> +#include <xen/arm/xen-ops.h>
>> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
>> index 82ffac6..a1bf9dd 100644
>> --- a/arch/arm/mm/dma-mapping.c
>> +++ b/arch/arm/mm/dma-mapping.c
>> @@ -33,7 +33,7 @@
>>   #include <asm/dma-iommu.h>
>>   #include <asm/mach/map.h>
>>   #include <asm/system_info.h>
>> -#include <xen/swiotlb-xen.h>
>> +#include <asm/xen/xen-ops.h>
>>   
>>   #include "dma.h"
>>   #include "mm.h"
>> @@ -2288,8 +2288,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>>   	set_dma_ops(dev, dma_ops);
>>   
>>   #ifdef CONFIG_XEN
>> -	if (xen_initial_domain())
>> -		dev->dma_ops = &xen_swiotlb_dma_ops;
>> +	xen_setup_dma_ops(dev);
>>   #endif
> You can take this opportunity to also remove the #ifdef, by providing an
> empty stub implemention of xen_setup_dma_ops for the !CONFIG_XEN case.


agree, will do


>
>
>>   	dev->archdata.dma_ops_setup = true;
>>   }
>> diff --git a/arch/arm64/include/asm/xen/xen-ops.h b/arch/arm64/include/asm/xen/xen-ops.h
>> new file mode 100644
>> index 00000000..8d2fa24
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/xen/xen-ops.h
>> @@ -0,0 +1 @@
>> +#include <xen/arm/xen-ops.h>
>> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
>> index 6719f9e..831e673 100644
>> --- a/arch/arm64/mm/dma-mapping.c
>> +++ b/arch/arm64/mm/dma-mapping.c
>> @@ -9,9 +9,9 @@
>>   #include <linux/dma-map-ops.h>
>>   #include <linux/dma-iommu.h>
>>   #include <xen/xen.h>
>> -#include <xen/swiotlb-xen.h>
>>   
>>   #include <asm/cacheflush.h>
>> +#include <asm/xen/xen-ops.h>
>>   
>>   void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
>>   		enum dma_data_direction dir)
>> @@ -53,7 +53,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>>   		iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
>>   
>>   #ifdef CONFIG_XEN
>> -	if (xen_swiotlb_detect())
>> -		dev->dma_ops = &xen_swiotlb_dma_ops;
>> +	xen_setup_dma_ops(dev);
>>   #endif
> same here

ok


>
>
>>   }
>> diff --git a/include/xen/arm/xen-ops.h b/include/xen/arm/xen-ops.h
>> new file mode 100644
>> index 00000000..621da05
>> --- /dev/null
>> +++ b/include/xen/arm/xen-ops.h
>> @@ -0,0 +1,13 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _ASM_ARM_XEN_OPS_H
>> +#define _ASM_ARM_XEN_OPS_H
>> +
>> +#include <xen/swiotlb-xen.h>
>> +
>> +static inline void xen_setup_dma_ops(struct device *dev)
>> +{
>> +	if (xen_swiotlb_detect())
>> +		dev->dma_ops = &xen_swiotlb_dma_ops;
>> +}
>> +
>> +#endif /* _ASM_ARM_XEN_OPS_H */
>> -- 
>> 2.7.4
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
diff mbox series

Patch

diff --git a/arch/arm/include/asm/xen/xen-ops.h b/arch/arm/include/asm/xen/xen-ops.h
new file mode 100644
index 00000000..8d2fa24
--- /dev/null
+++ b/arch/arm/include/asm/xen/xen-ops.h
@@ -0,0 +1 @@ 
+#include <xen/arm/xen-ops.h>
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 82ffac6..a1bf9dd 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -33,7 +33,7 @@ 
 #include <asm/dma-iommu.h>
 #include <asm/mach/map.h>
 #include <asm/system_info.h>
-#include <xen/swiotlb-xen.h>
+#include <asm/xen/xen-ops.h>
 
 #include "dma.h"
 #include "mm.h"
@@ -2288,8 +2288,7 @@  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 	set_dma_ops(dev, dma_ops);
 
 #ifdef CONFIG_XEN
-	if (xen_initial_domain())
-		dev->dma_ops = &xen_swiotlb_dma_ops;
+	xen_setup_dma_ops(dev);
 #endif
 	dev->archdata.dma_ops_setup = true;
 }
diff --git a/arch/arm64/include/asm/xen/xen-ops.h b/arch/arm64/include/asm/xen/xen-ops.h
new file mode 100644
index 00000000..8d2fa24
--- /dev/null
+++ b/arch/arm64/include/asm/xen/xen-ops.h
@@ -0,0 +1 @@ 
+#include <xen/arm/xen-ops.h>
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 6719f9e..831e673 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -9,9 +9,9 @@ 
 #include <linux/dma-map-ops.h>
 #include <linux/dma-iommu.h>
 #include <xen/xen.h>
-#include <xen/swiotlb-xen.h>
 
 #include <asm/cacheflush.h>
+#include <asm/xen/xen-ops.h>
 
 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 		enum dma_data_direction dir)
@@ -53,7 +53,6 @@  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 		iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
 
 #ifdef CONFIG_XEN
-	if (xen_swiotlb_detect())
-		dev->dma_ops = &xen_swiotlb_dma_ops;
+	xen_setup_dma_ops(dev);
 #endif
 }
diff --git a/include/xen/arm/xen-ops.h b/include/xen/arm/xen-ops.h
new file mode 100644
index 00000000..621da05
--- /dev/null
+++ b/include/xen/arm/xen-ops.h
@@ -0,0 +1,13 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_ARM_XEN_OPS_H
+#define _ASM_ARM_XEN_OPS_H
+
+#include <xen/swiotlb-xen.h>
+
+static inline void xen_setup_dma_ops(struct device *dev)
+{
+	if (xen_swiotlb_detect())
+		dev->dma_ops = &xen_swiotlb_dma_ops;
+}
+
+#endif /* _ASM_ARM_XEN_OPS_H */