Re: [PATCH v4 03/17] remoteproc: add release ops in rproc_mem_entry struct

[Suman Anna]

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@xxxxxx>
> Acked-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>

Acked-by: Suman Anna <s-anna@xxxxxx>

> ---
>  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
>   * @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;
>  
>  /**
>