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

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Message-ID: <20171127083713.clh6oz5sgere4usq@linux-u7w5.ap.freescale.net>
Date:   Mon, 27 Nov 2017 16:37:15 +0800
From:   Peng Fan <van.freenix@...il.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Peng Fan <peng.fan@....com>, hch@....de, robin.murphy@....com,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        frowand.list@...il.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC 2/2] drivers: dma-mapping: parse per device reserved mem at
 probe time

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@....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
>

--