[RFC 1/2] of: reserved_mem: check return value of_dma_configure

[RFC 1/2] of: reserved_mem: check return value of_dma_configure

[Peng Fan]

In commit <7b07cbefb6>("iommu: of: Handle IOMMU lookup failure
with deferred probing or error"), there is possibility that
of_dma_configure may fail. So in of_reserved_mem_device_init_by_idx,
also need to propagate the return value of_dma_configure to caller,
when need to use reserved memory for a device which needs iommu.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/of/of_reserved_mem.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 22b75c82e377..61523819b50e 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -357,9 +357,12 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
 		/* ensure that dma_ops is set for virtual devices
 		 * using reserved memory
 		 */
-		of_dma_configure(dev, np);
-
-		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+		ret = of_dma_configure(dev, np);
+		if (ret)
+			of_reserved_mem_device_release(dev);
+		else
+			dev_info(dev, "assigned reserved memory node %s\n",
+				 rmem->name);
 	} else {
 		kfree(rd);
 	}
-- 
2.14.1

[RFC 1/2] of: reserved_mem: check return value of_dma_configure

[Peng Fan]

In commit <7b07cbefb6>("iommu: of: Handle IOMMU lookup failure
with deferred probing or error"), there is possibility that
of_dma_configure may fail. So in of_reserved_mem_device_init_by_idx,
also need to propagate the return value of_dma_configure to caller,
when need to use reserved memory for a device which needs iommu.

Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
---
 drivers/of/of_reserved_mem.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 22b75c82e377..61523819b50e 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -357,9 +357,12 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
 		/* ensure that dma_ops is set for virtual devices
 		 * using reserved memory
 		 */
-		of_dma_configure(dev, np);
-
-		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+		ret = of_dma_configure(dev, np);
+		if (ret)
+			of_reserved_mem_device_release(dev);
+		else
+			dev_info(dev, "assigned reserved memory node %s\n",
+				 rmem->name);
 	} else {
 		kfree(rd);
 	}
-- 
2.14.1

[RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Invoke of_reserved_mem_device_init at dma_configure, then
there is no need to call of_reserved_mem_device_init in device
specific probe function.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/base/dma-mapping.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index e584eddef0a7..55dca06a7b55 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -12,6 +12,7 @@
 #include <linux/export.h>
 #include <linux/gfp.h>
 #include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 
@@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
 	}
 
 	if (dma_dev->of_node) {
-		ret = of_dma_configure(dev, dma_dev->of_node);
+		ret = of_reserved_mem_device_init(dev);
+		if (ret)
+			ret = of_dma_configure(dev, dma_dev->of_node);
 	} else if (has_acpi_companion(dma_dev)) {
 		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
 		if (attr != DEV_DMA_NOT_SUPPORTED)
@@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
 void dma_deconfigure(struct device *dev)
 {
 	of_dma_deconfigure(dev);
+	of_reserved_mem_device_release(dev);
 	acpi_dma_deconfigure(dev);
 }
-- 
2.14.1

[RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Invoke of_reserved_mem_device_init at dma_configure, then
there is no need to call of_reserved_mem_device_init in device
specific probe function.

Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
---
 drivers/base/dma-mapping.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index e584eddef0a7..55dca06a7b55 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -12,6 +12,7 @@
 #include <linux/export.h>
 #include <linux/gfp.h>
 #include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 
@@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
 	}
 
 	if (dma_dev->of_node) {
-		ret = of_dma_configure(dev, dma_dev->of_node);
+		ret = of_reserved_mem_device_init(dev);
+		if (ret)
+			ret = of_dma_configure(dev, dma_dev->of_node);
 	} else if (has_acpi_companion(dma_dev)) {
 		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
 		if (attr != DEV_DMA_NOT_SUPPORTED)
@@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
 void dma_deconfigure(struct device *dev)
 {
 	of_dma_deconfigure(dev);
+	of_reserved_mem_device_release(dev);
 	acpi_dma_deconfigure(dev);
 }
-- 
2.14.1

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RE: [RFC 1/2] of: reserved_mem: check return value of_dma_configure

[Peng Fan]

> -----Original Message-----
> From: Peng Fan
> Sent: Sunday, November 26, 2017 9:14 PM
> To: hch@lst.de; m.szyprowski@samsung.com; robin.murphy@arm.com;
> gregkh@linuxfoundation.org; robh+dt@kernel.org; frowand.list@gmail.com
> Cc: iommu@lists.linux-foundation.org; linux-kernel@vger.kernel.org;
> devicetree@vger.kernel.org; van.freenix@gmail.com; Peng Fan
> <peng.fan@nxp.com>
> Subject: [RFC 1/2] of: reserved_mem: check return value of_dma_configure
> 
> In commit <7b07cbefb6>("iommu: of: Handle IOMMU lookup failure with
> deferred probing or error"), there is possibility that of_dma_configure may fail.
> So in of_reserved_mem_device_init_by_idx,
> also need to propagate the return value of_dma_configure to caller, when
> need to use reserved memory for a device which needs iommu.

Seems my understanding is wrong, with iommu enabled, reserved memory will not be used
for devices with memory-region. Please still help review RFC 2/2.

Thanks,
Peng.

> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/of/of_reserved_mem.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 22b75c82e377..61523819b50e 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -357,9 +357,12 @@ int of_reserved_mem_device_init_by_idx(struct
> device *dev,
>  		/* ensure that dma_ops is set for virtual devices
>  		 * using reserved memory
>  		 */
> -		of_dma_configure(dev, np);
> -
> -		dev_info(dev, "assigned reserved memory node %s\n", rmem-
> >name);
> +		ret = of_dma_configure(dev, np);
> +		if (ret)
> +			of_reserved_mem_device_release(dev);
> +		else
> +			dev_info(dev, "assigned reserved memory node %s\n",
> +				 rmem->name);
>  	} else {
>  		kfree(rd);
>  	}
> --
> 2.14.1

RE: [RFC 1/2] of: reserved_mem: check return value of_dma_configure

[Peng Fan]

> -----Original Message-----
> From: Peng Fan
> Sent: Sunday, November 26, 2017 9:14 PM
> To: hch-jcswGhMUV9g@public.gmane.org; m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org; robin.murphy-5wv7dgnIgG8@public.gmane.org;
> gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org; robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org; frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org; linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org;
> devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; van.freenix-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org; Peng Fan
> <peng.fan-3arQi8VN3Tc@public.gmane.org>
> Subject: [RFC 1/2] of: reserved_mem: check return value of_dma_configure
> 
> In commit <7b07cbefb6>("iommu: of: Handle IOMMU lookup failure with
> deferred probing or error"), there is possibility that of_dma_configure may fail.
> So in of_reserved_mem_device_init_by_idx,
> also need to propagate the return value of_dma_configure to caller, when
> need to use reserved memory for a device which needs iommu.

Seems my understanding is wrong, with iommu enabled, reserved memory will not be used
for devices with memory-region. Please still help review RFC 2/2.

Thanks,
Peng.

> 
> Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
> ---
>  drivers/of/of_reserved_mem.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 22b75c82e377..61523819b50e 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -357,9 +357,12 @@ int of_reserved_mem_device_init_by_idx(struct
> device *dev,
>  		/* ensure that dma_ops is set for virtual devices
>  		 * using reserved memory
>  		 */
> -		of_dma_configure(dev, np);
> -
> -		dev_info(dev, "assigned reserved memory node %s\n", rmem-
> >name);
> +		ret = of_dma_configure(dev, np);
> +		if (ret)
> +			of_reserved_mem_device_release(dev);
> +		else
> +			dev_info(dev, "assigned reserved memory node %s\n",
> +				 rmem->name);
>  	} else {
>  		kfree(rd);
>  	}
> --
> 2.14.1

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Marek Szyprowski]

Hi

On 2017-11-26 14:13, Peng Fan wrote:
> Invoke of_reserved_mem_device_init at dma_configure, then
> there is no need to call of_reserved_mem_device_init in device
> specific probe function.
>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

This has been already tried long time ago, without success:
http://patches.linaro.org/patch/33558/

> ---
>   drivers/base/dma-mapping.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
> index e584eddef0a7..55dca06a7b55 100644
> --- a/drivers/base/dma-mapping.c
> +++ b/drivers/base/dma-mapping.c
> @@ -12,6 +12,7 @@
>   #include <linux/export.h>
>   #include <linux/gfp.h>
>   #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
>   #include <linux/slab.h>
>   #include <linux/vmalloc.h>
>   
> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>   	}
>   
>   	if (dma_dev->of_node) {
> -		ret = of_dma_configure(dev, dma_dev->of_node);
> +		ret = of_reserved_mem_device_init(dev);
> +		if (ret)
> +			ret = of_dma_configure(dev, dma_dev->of_node);
>   	} else if (has_acpi_companion(dma_dev)) {
>   		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>   		if (attr != DEV_DMA_NOT_SUPPORTED)
> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>   void dma_deconfigure(struct device *dev)
>   {
>   	of_dma_deconfigure(dev);
> +	of_reserved_mem_device_release(dev);
>   	acpi_dma_deconfigure(dev);
>   }

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Marek Szyprowski]

Hi

On 2017-11-26 14:13, Peng Fan wrote:
> Invoke of_reserved_mem_device_init at dma_configure, then
> there is no need to call of_reserved_mem_device_init in device
> specific probe function.
>
> Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>

This has been already tried long time ago, without success:
http://patches.linaro.org/patch/33558/

> ---
>   drivers/base/dma-mapping.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
> index e584eddef0a7..55dca06a7b55 100644
> --- a/drivers/base/dma-mapping.c
> +++ b/drivers/base/dma-mapping.c
> @@ -12,6 +12,7 @@
>   #include <linux/export.h>
>   #include <linux/gfp.h>
>   #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
>   #include <linux/slab.h>
>   #include <linux/vmalloc.h>
>   
> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>   	}
>   
>   	if (dma_dev->of_node) {
> -		ret = of_dma_configure(dev, dma_dev->of_node);
> +		ret = of_reserved_mem_device_init(dev);
> +		if (ret)
> +			ret = of_dma_configure(dev, dma_dev->of_node);
>   	} else if (has_acpi_companion(dma_dev)) {
>   		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>   		if (attr != DEV_DMA_NOT_SUPPORTED)
> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>   void dma_deconfigure(struct device *dev)
>   {
>   	of_dma_deconfigure(dev);
> +	of_reserved_mem_device_release(dev);
>   	acpi_dma_deconfigure(dev);
>   }

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Hi Marek, 

On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>Hi
>
>On 2017-11-26 14:13, Peng Fan wrote:
>> Invoke of_reserved_mem_device_init at dma_configure, then
>> there is no need to call of_reserved_mem_device_init in device
>> specific probe function.
>> 
>> Signed-off-by: Peng Fan <peng.fan@nxp.com>
>
>This has been already tried long time ago, without success:
>http://patches.linaro.org/patch/33558/

Thanks for the info. I should first search mail list before
sending out patches.

Thanks,
Peng.

>
>> ---
>>   drivers/base/dma-mapping.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>> index e584eddef0a7..55dca06a7b55 100644
>> --- a/drivers/base/dma-mapping.c
>> +++ b/drivers/base/dma-mapping.c
>> @@ -12,6 +12,7 @@
>>   #include <linux/export.h>
>>   #include <linux/gfp.h>
>>   #include <linux/of_device.h>
>> +#include <linux/of_reserved_mem.h>
>>   #include <linux/slab.h>
>>   #include <linux/vmalloc.h>
>> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>>   	}
>>   	if (dma_dev->of_node) {
>> -		ret = of_dma_configure(dev, dma_dev->of_node);
>> +		ret = of_reserved_mem_device_init(dev);
>> +		if (ret)
>> +			ret = of_dma_configure(dev, dma_dev->of_node);
>>   	} else if (has_acpi_companion(dma_dev)) {
>>   		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>>   		if (attr != DEV_DMA_NOT_SUPPORTED)
>> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>>   void dma_deconfigure(struct device *dev)
>>   {
>>   	of_dma_deconfigure(dev);
>> +	of_reserved_mem_device_release(dev);
>>   	acpi_dma_deconfigure(dev);
>>   }
>
>Best regards
>-- 
>Marek Szyprowski, PhD
>Samsung R&D Institute Poland
>

-- 

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Hi Marek, 

On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>Hi
>
>On 2017-11-26 14:13, Peng Fan wrote:
>> Invoke of_reserved_mem_device_init at dma_configure, then
>> there is no need to call of_reserved_mem_device_init in device
>> specific probe function.
>> 
>> Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
>
>This has been already tried long time ago, without success:
>http://patches.linaro.org/patch/33558/

Thanks for the info. I should first search mail list before
sending out patches.

Thanks,
Peng.

>
>> ---
>>   drivers/base/dma-mapping.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>> index e584eddef0a7..55dca06a7b55 100644
>> --- a/drivers/base/dma-mapping.c
>> +++ b/drivers/base/dma-mapping.c
>> @@ -12,6 +12,7 @@
>>   #include <linux/export.h>
>>   #include <linux/gfp.h>
>>   #include <linux/of_device.h>
>> +#include <linux/of_reserved_mem.h>
>>   #include <linux/slab.h>
>>   #include <linux/vmalloc.h>
>> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>>   	}
>>   	if (dma_dev->of_node) {
>> -		ret = of_dma_configure(dev, dma_dev->of_node);
>> +		ret = of_reserved_mem_device_init(dev);
>> +		if (ret)
>> +			ret = of_dma_configure(dev, dma_dev->of_node);
>>   	} else if (has_acpi_companion(dma_dev)) {
>>   		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>>   		if (attr != DEV_DMA_NOT_SUPPORTED)
>> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>>   void dma_deconfigure(struct device *dev)
>>   {
>>   	of_dma_deconfigure(dev);
>> +	of_reserved_mem_device_release(dev);
>>   	acpi_dma_deconfigure(dev);
>>   }
>
>Best regards
>-- 
>Marek Szyprowski, PhD
>Samsung R&D Institute Poland
>

-- 

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Marek Szyprowski]

Hi Peng,

On 2017-11-27 09:37, Peng Fan wrote:
> Hi Marek,
>
> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>> Hi
>>
>> On 2017-11-26 14:13, Peng Fan wrote:
>>> Invoke of_reserved_mem_device_init at dma_configure, then
>>> there is no need to call of_reserved_mem_device_init in device
>>> specific probe function.
>>>
>>> Signed-off-by: Peng Fan <peng.fan@nxp.com>
>> This has been already tried long time ago, without success:
>> http://patches.linaro.org/patch/33558/
> Thanks for the info. I should first search mail list before
> sending out patches.

It doesn't mean that I'm against such idea. I just pointed that I've
already tried. That time, however there was no dma_configure() function
yet, which seems to be better place for of_rmem_device_init().

I would however always call of_dma_configure(), even when reserved mem
node is there. IIRC on ARM64 that function configures dma_ops, without
which no dma is possible at all.

>
> Thanks,
> Peng.
>
>>> ---
>>>    drivers/base/dma-mapping.c | 6 +++++-
>>>    1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>>> index e584eddef0a7..55dca06a7b55 100644
>>> --- a/drivers/base/dma-mapping.c
>>> +++ b/drivers/base/dma-mapping.c
>>> @@ -12,6 +12,7 @@
>>>    #include <linux/export.h>
>>>    #include <linux/gfp.h>
>>>    #include <linux/of_device.h>
>>> +#include <linux/of_reserved_mem.h>
>>>    #include <linux/slab.h>
>>>    #include <linux/vmalloc.h>
>>> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>>>    	}
>>>    	if (dma_dev->of_node) {
>>> -		ret = of_dma_configure(dev, dma_dev->of_node);
>>> +		ret = of_reserved_mem_device_init(dev);
>>> +		if (ret)
>>> +			ret = of_dma_configure(dev, dma_dev->of_node);
>>>    	} else if (has_acpi_companion(dma_dev)) {
>>>    		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>>>    		if (attr != DEV_DMA_NOT_SUPPORTED)
>>> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>>>    void dma_deconfigure(struct device *dev)
>>>    {
>>>    	of_dma_deconfigure(dev);
>>> +	of_reserved_mem_device_release(dev);
>>>    	acpi_dma_deconfigure(dev);
>>>    }

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Marek Szyprowski]

Hi Peng,

On 2017-11-27 09:37, Peng Fan wrote:
> Hi Marek,
>
> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>> Hi
>>
>> On 2017-11-26 14:13, Peng Fan wrote:
>>> Invoke of_reserved_mem_device_init at dma_configure, then
>>> there is no need to call of_reserved_mem_device_init in device
>>> specific probe function.
>>>
>>> Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
>> This has been already tried long time ago, without success:
>> http://patches.linaro.org/patch/33558/
> Thanks for the info. I should first search mail list before
> sending out patches.

It doesn't mean that I'm against such idea. I just pointed that I've
already tried. That time, however there was no dma_configure() function
yet, which seems to be better place for of_rmem_device_init().

I would however always call of_dma_configure(), even when reserved mem
node is there. IIRC on ARM64 that function configures dma_ops, without
which no dma is possible at all.

>
> Thanks,
> Peng.
>
>>> ---
>>>    drivers/base/dma-mapping.c | 6 +++++-
>>>    1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>>> index e584eddef0a7..55dca06a7b55 100644
>>> --- a/drivers/base/dma-mapping.c
>>> +++ b/drivers/base/dma-mapping.c
>>> @@ -12,6 +12,7 @@
>>>    #include <linux/export.h>
>>>    #include <linux/gfp.h>
>>>    #include <linux/of_device.h>
>>> +#include <linux/of_reserved_mem.h>
>>>    #include <linux/slab.h>
>>>    #include <linux/vmalloc.h>
>>> @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>>>    	}
>>>    	if (dma_dev->of_node) {
>>> -		ret = of_dma_configure(dev, dma_dev->of_node);
>>> +		ret = of_reserved_mem_device_init(dev);
>>> +		if (ret)
>>> +			ret = of_dma_configure(dev, dma_dev->of_node);
>>>    	} else if (has_acpi_companion(dma_dev)) {
>>>    		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>>>    		if (attr != DEV_DMA_NOT_SUPPORTED)
>>> @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>>>    void dma_deconfigure(struct device *dev)
>>>    {
>>>    	of_dma_deconfigure(dev);
>>> +	of_reserved_mem_device_release(dev);
>>>    	acpi_dma_deconfigure(dev);
>>>    }

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Hi Marek,

On Mon, Nov 27, 2017 at 09:44:20AM +0100, Marek Szyprowski wrote:
>Hi Peng,
>
>On 2017-11-27 09:37, Peng Fan wrote:
>> Hi Marek,
>> 
>> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>> > Hi
>> > 
>> > On 2017-11-26 14:13, Peng Fan wrote:
>> > > Invoke of_reserved_mem_device_init at dma_configure, then
>> > > there is no need to call of_reserved_mem_device_init in device
>> > > specific probe function.
>> > > 
>> > > Signed-off-by: Peng Fan <peng.fan@nxp.com>
>> > This has been already tried long time ago, without success:
>> > http://patches.linaro.org/patch/33558/
>> Thanks for the info. I should first search mail list before
>> sending out patches.
>
>It doesn't mean that I'm against such idea. I just pointed that I've
>already tried. That time, however there was no dma_configure() function
>yet, which seems to be better place for of_rmem_device_init().
>
>I would however always call of_dma_configure(), even when reserved mem
>node is there. IIRC on ARM64 that function configures dma_ops, without
>which no dma is possible at all.

So, you prefer this?
	if (dma_dev->of_node) {
+		of_reserved_mem_device_init(dev);
		ret = of_dma_configure(dev, dma_dev->of_node);

However in of_reserved_mem_device, there is also an call to
of_dma_configure.

"
	/* ensure that dma_ops is set for virtual devices
	 * using reserved memory
	 */
	 ret = of_dma_configure(dev, np);
"

If always call of_dma_configure, of_dma_configure maybe called twice.

I just checked more. of_reserved_mem_device_init only handle the first
memory-region. To nodes which have multiple memory-region, seems 2nd and etc
could not be handled, such as drivers/media/platform/s5p-mfc/s5p_mfc.c.

Thanks,
Peng.

>
>> 
>> Thanks,
>> Peng.
>> 
>> > > ---
>> > >    drivers/base/dma-mapping.c | 6 +++++-
>> > >    1 file changed, 5 insertions(+), 1 deletion(-)
>> > > 
>> > > diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>> > > index e584eddef0a7..55dca06a7b55 100644
>> > > --- a/drivers/base/dma-mapping.c
>> > > +++ b/drivers/base/dma-mapping.c
>> > > @@ -12,6 +12,7 @@
>> > >    #include <linux/export.h>
>> > >    #include <linux/gfp.h>
>> > >    #include <linux/of_device.h>
>> > > +#include <linux/of_reserved_mem.h>
>> > >    #include <linux/slab.h>
>> > >    #include <linux/vmalloc.h>
>> > > @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>> > >    	}
>> > >    	if (dma_dev->of_node) {
>> > > -		ret = of_dma_configure(dev, dma_dev->of_node);
>> > > +		ret = of_reserved_mem_device_init(dev);
>> > > +		if (ret)
>> > > +			ret = of_dma_configure(dev, dma_dev->of_node);
>> > >    	} else if (has_acpi_companion(dma_dev)) {
>> > >    		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>> > >    		if (attr != DEV_DMA_NOT_SUPPORTED)
>> > > @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>> > >    void dma_deconfigure(struct device *dev)
>> > >    {
>> > >    	of_dma_deconfigure(dev);
>> > > +	of_reserved_mem_device_release(dev);
>> > >    	acpi_dma_deconfigure(dev);
>> > >    }
>
>Best regards
>-- 
>Marek Szyprowski, PhD
>Samsung R&D Institute Poland
>

-- 

Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Peng Fan]

Hi Marek,

On Mon, Nov 27, 2017 at 09:44:20AM +0100, Marek Szyprowski wrote:
>Hi Peng,
>
>On 2017-11-27 09:37, Peng Fan wrote:
>> Hi Marek,
>> 
>> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>> > Hi
>> > 
>> > On 2017-11-26 14:13, Peng Fan wrote:
>> > > Invoke of_reserved_mem_device_init at dma_configure, then
>> > > there is no need to call of_reserved_mem_device_init in device
>> > > specific probe function.
>> > > 
>> > > Signed-off-by: Peng Fan <peng.fan-3arQi8VN3Tc@public.gmane.org>
>> > This has been already tried long time ago, without success:
>> > http://patches.linaro.org/patch/33558/
>> Thanks for the info. I should first search mail list before
>> sending out patches.
>
>It doesn't mean that I'm against such idea. I just pointed that I've
>already tried. That time, however there was no dma_configure() function
>yet, which seems to be better place for of_rmem_device_init().
>
>I would however always call of_dma_configure(), even when reserved mem
>node is there. IIRC on ARM64 that function configures dma_ops, without
>which no dma is possible at all.

So, you prefer this?
	if (dma_dev->of_node) {
+		of_reserved_mem_device_init(dev);
		ret = of_dma_configure(dev, dma_dev->of_node);

However in of_reserved_mem_device, there is also an call to
of_dma_configure.

"
	/* ensure that dma_ops is set for virtual devices
	 * using reserved memory
	 */
	 ret = of_dma_configure(dev, np);
"

If always call of_dma_configure, of_dma_configure maybe called twice.

I just checked more. of_reserved_mem_device_init only handle the first
memory-region. To nodes which have multiple memory-region, seems 2nd and etc
could not be handled, such as drivers/media/platform/s5p-mfc/s5p_mfc.c.

Thanks,
Peng.

>
>> 
>> Thanks,
>> Peng.
>> 
>> > > ---
>> > >    drivers/base/dma-mapping.c | 6 +++++-
>> > >    1 file changed, 5 insertions(+), 1 deletion(-)
>> > > 
>> > > diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
>> > > index e584eddef0a7..55dca06a7b55 100644
>> > > --- a/drivers/base/dma-mapping.c
>> > > +++ b/drivers/base/dma-mapping.c
>> > > @@ -12,6 +12,7 @@
>> > >    #include <linux/export.h>
>> > >    #include <linux/gfp.h>
>> > >    #include <linux/of_device.h>
>> > > +#include <linux/of_reserved_mem.h>
>> > >    #include <linux/slab.h>
>> > >    #include <linux/vmalloc.h>
>> > > @@ -351,7 +352,9 @@ int dma_configure(struct device *dev)
>> > >    	}
>> > >    	if (dma_dev->of_node) {
>> > > -		ret = of_dma_configure(dev, dma_dev->of_node);
>> > > +		ret = of_reserved_mem_device_init(dev);
>> > > +		if (ret)
>> > > +			ret = of_dma_configure(dev, dma_dev->of_node);
>> > >    	} else if (has_acpi_companion(dma_dev)) {
>> > >    		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
>> > >    		if (attr != DEV_DMA_NOT_SUPPORTED)
>> > > @@ -367,5 +370,6 @@ int dma_configure(struct device *dev)
>> > >    void dma_deconfigure(struct device *dev)
>> > >    {
>> > >    	of_dma_deconfigure(dev);
>> > > +	of_reserved_mem_device_release(dev);
>> > >    	acpi_dma_deconfigure(dev);
>> > >    }
>
>Best regards
>-- 
>Marek Szyprowski, PhD
>Samsung R&D Institute Poland
>

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Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at probe time

[Marek Szyprowski]

Hi Peng,

On 2017-11-27 10:04, Peng Fan wrote:
> On Mon, Nov 27, 2017 at 09:44:20AM +0100, Marek Szyprowski wrote:
>> On 2017-11-27 09:37, Peng Fan wrote:
>>> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>>>> On 2017-11-26 14:13, Peng Fan wrote:
>>>>> Invoke of_reserved_mem_device_init at dma_configure, then
>>>>> there is no need to call of_reserved_mem_device_init in device
>>>>> specific probe function.
>>>>>
>>>>> Signed-off-by: Peng Fan <peng.fan@nxp.com>
>>>> This has been already tried long time ago, without success:
>>>> http://patches.linaro.org/patch/33558/
>>> Thanks for the info. I should first search mail list before
>>> sending out patches.
>> It doesn't mean that I'm against such idea. I just pointed that I've
>> already tried. That time, however there was no dma_configure() function
>> yet, which seems to be better place for of_rmem_device_init().
>>
>> I would however always call of_dma_configure(), even when reserved mem
>> node is there. IIRC on ARM64 that function configures dma_ops, without
>> which no dma is possible at all.
> So, you prefer this?
> 	if (dma_dev->of_node) {
> +		of_reserved_mem_device_init(dev);
> 		ret = of_dma_configure(dev, dma_dev->of_node);
>
> However in of_reserved_mem_device, there is also an call to
> of_dma_configure.
>
> "
> 	/* ensure that dma_ops is set for virtual devices
> 	 * using reserved memory
> 	 */
> 	 ret = of_dma_configure(dev, np);
> "
>
> If always call of_dma_configure, of_dma_configure maybe called twice.

Right, I forgot about this.

> I just checked more. of_reserved_mem_device_init only handle the first
> memory-region. To nodes which have multiple memory-region, seems 2nd and etc
> could not be handled, such as drivers/media/platform/s5p-mfc/s5p_mfc.c.

Well, maybe automatic assignment should be done only when there is only
one reserved region set? In case more than one region assigned to a device,
the driver has to create virtual child devices and configure DMA for them
to be able to let dma-mapping API to use those reserved regions. It looks
that the call to of_dma_configure(dev, np) can be moved back to the driver
(it was not possible at the time that code was merged due to missing
export symbols).

Configuring more than one reserved memory region for given device might
then moved to some helper function to have a common code for that across
the drivers.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland