linux-kernel - Re: [PATCH v4 03/17] remoteproc: add release ops in rproc_mem

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Message-ID: <e2a57972-e0bc-bd32-0815-435c40af656a@ti.com>
Date:   Tue, 23 Oct 2018 15:48:34 -0500
From:   Suman Anna <s-anna@...com>
To:     Loic Pallardy <loic.pallardy@...com>, <bjorn.andersson@...aro.org>,
        <ohad@...ery.com>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <arnaud.pouliquen@...com>, <benjamin.gaignard@...aro.org>
Subject: Re: [PATCH v4 03/17] remoteproc: add release ops in rproc_mem_entry
 struct

On 10/23/18 11:53 AM, Suman Anna wrote:
> On 7/27/18 8:14 AM, Loic Pallardy wrote:
>> Memory entry could be allocated in different ways (ioremap,
>> dma_alloc_coherent, internal RAM allocator...).
>> This patch introduces a release ops in rproc_mem_entry structure
>> to associate dedicated release mechanism to each memory entry descriptor
>> in order to keep remoteproc core generic.
>>
>> Signed-off-by: Loic Pallardy <loic.pallardy@...com>
>> Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Acked-by: Suman Anna <s-anna@...com>
> 
>> ---
>>  drivers/remoteproc/remoteproc_core.c | 23 +++++++++++++++++++++--
>>  include/linux/remoteproc.h           |  5 ++++-
>>  2 files changed, 25 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>> index 8e5fe1e..24fe11f 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -600,6 +600,24 @@ static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
>>  }
>>  
>>  /**
>> + * rproc_release_carveout() - release acquired carveout
>> + * @rproc: rproc handle
>> + * @mem: the memory entry to release
>> + *
>> + * This function releases specified memory entry @mem allocated via
>> + * dma_alloc_coherent() function by @rproc.
>> + */
>> +static int rproc_release_carveout(struct rproc *rproc,
>> +				  struct rproc_mem_entry *mem)
>> +{
>> +	struct device *dev = &rproc->dev;
>> +
>> +	/* clean up carveout allocations */
>> +	dma_free_coherent(dev->parent, mem->len, mem->va, mem->dma);
>> +	return 0;
>> +}
>> +
>> +/**
>>   * rproc_handle_carveout() - handle phys contig memory allocation requests
>>   * @rproc: rproc handle
>>   * @rsc: the resource entry
>> @@ -733,6 +751,7 @@ static int rproc_handle_carveout(struct rproc *rproc,
>>  	carveout->len = rsc->len;
>>  	carveout->dma = dma;
>>  	carveout->da = rsc->da;
>> +	carveout->release = rproc_release_carveout;
>>  
>>  	list_add_tail(&carveout->node, &rproc->carveouts);
>>  
>> @@ -920,8 +939,8 @@ static void rproc_resource_cleanup(struct rproc *rproc)
>>  
>>  	/* clean up carveout allocations */
>>  	list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
>> -		dma_free_coherent(dev->parent, entry->len, entry->va,
>> -				  entry->dma);
>> +		if (entry->release)
>> +			entry->release(rproc, entry);
>>  		list_del(&entry->node);
>>  		kfree(entry);
>>  	}
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index e3c5d85..bef2e83 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -305,12 +305,15 @@ struct fw_rsc_vdev {
>>  	struct fw_rsc_vdev_vring vring[0];
>>  } __packed;
>>  
>> +struct rproc;
>> +
>>  /**
>>   * struct rproc_mem_entry - memory entry descriptor
>>   * @va:	virtual address
>>   * @dma: dma address
>>   * @len: length, in bytes
>>   * @da: device address
>> + * @release: release associated memory

Missed this earlier, move this line after the @node.

regards
Suman

>>   * @priv: associated data
>>   * @node: list node
>>   */
>> @@ -321,9 +324,9 @@ struct rproc_mem_entry {
>>  	u32 da;
>>  	void *priv;
>>  	struct list_head node;
>> +	int (*release)(struct rproc *rproc, struct rproc_mem_entry *mem);
>>  };
>>  
>> -struct rproc;
>>  struct firmware;
>>  
>>  /**
>>
>