2022-04-16 00:23:18

by Oleksandr Tyshchenko

[permalink] [raw]
Subject: [RFC PATCH 5/6] arm/xen: Introduce xen_setup_dma_ops()

From: Oleksandr Tyshchenko <[email protected]>

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 <[email protected]>
---
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
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 */
--
2.7.4


2022-04-16 01:17:58

by Stefano Stabellini

[permalink] [raw]
Subject: Re: [RFC PATCH 5/6] arm/xen: Introduce xen_setup_dma_ops()

On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <[email protected]>
>
> 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 <[email protected]>
> ---
> 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
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

2022-04-18 02:23:43

by Oleksandr Tyshchenko

[permalink] [raw]
Subject: Re: [RFC PATCH 5/6] arm/xen: Introduce xen_setup_dma_ops()


On 16.04.22 01:02, Stefano Stabellini wrote:

Hello Stefano

> On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <[email protected]>
>>
>> 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 <[email protected]>
>> ---
>> 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
>> [email protected]
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
--
Regards,

Oleksandr Tyshchenko