linux-kernel - Re: [PATCH 3/4] remoteproc: Move vdev handling to boot/shutdown

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Date:	Tue, 2 Aug 2016 17:17:28 +0200
From:	loic pallardy <loic.pallardy@...com>
To:	Bjorn Andersson <bjorn.andersson@...aro.org>,
	<linux-remoteproc@...r.kernel.org>
CC:	Ohad Ben-Cohen <ohad@...ery.com>, <linux-kernel@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 3/4] remoteproc: Move vdev handling to boot/shutdown

Hi Bjorn,


On 08/01/2016 08:58 PM, Bjorn Andersson wrote:
> The newly introduced "always-on" flag allows us to stop giving the vdevs
> special treatment. The ordering of resource allocation and life cycle of
> the remote processor is kept intact.
>
> This allows us to mark a remote processor with vdevs to not boot unless
> explicitly requested to do so by a client driver.
>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Loic Pallardy <loic.pallardy@...com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>   drivers/remoteproc/remoteproc_core.c | 34 ++++++++++++++--------------------
>   1 file changed, 14 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 084ebffdfc47..9d64409f3839 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -753,6 +753,7 @@ static int rproc_handle_resources(struct rproc *rproc, int len,
>   static void rproc_resource_cleanup(struct rproc *rproc)
>   {
>   	struct rproc_mem_entry *entry, *tmp;
> +	struct rproc_vdev *rvdev, *rvtmp;
>   	struct device *dev = &rproc->dev;
>
>   	/* clean up debugfs trace entries */
> @@ -785,6 +786,10 @@ static void rproc_resource_cleanup(struct rproc *rproc)
>   		list_del(&entry->node);
>   		kfree(entry);
>   	}
> +
> +	/* clean up remote vdev entries */
> +	list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
> +		rproc_remove_virtio_dev(rvdev);
>   }
>
>   /*
> @@ -835,6 +840,13 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>   	/* reset max_notifyid */
>   	rproc->max_notifyid = -1;
>
> +	/* look for virtio devices and register them */
> +	ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
> +	if (ret) {
> +		dev_err(dev, "Failed to handle vdev resources: %d\n", ret);
> +		goto clean_up;
> +	}
> +
>   	/* handle fw resources which are required to boot rproc */
>   	ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
>   	if (ret) {
> @@ -898,7 +910,7 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
>   {
>   	struct rproc *rproc = context;
>   	struct resource_table *table;
> -	int ret, tablesz;
> +	int tablesz;
>
>   	if (rproc_fw_sanity_check(rproc, fw) < 0)
>   		goto out;
> @@ -922,9 +934,6 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
>
>   	rproc->table_ptr = rproc->cached_table;
>
> -	/* look for virtio devices and register them */
> -	ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
> -
>   	/* if rproc is marked always-on, request it to boot */
>   	if (rproc->always_on)
>   		rproc_boot_nowait(rproc);
> @@ -973,9 +982,6 @@ static int rproc_add_virtio_devices(struct rproc *rproc)
>    */
>   int rproc_trigger_recovery(struct rproc *rproc)
>   {
> -	struct rproc_vdev *rvdev, *rvtmp;
> -	int ret;
> -
>   	dev_err(&rproc->dev, "recovering %s\n", rproc->name);
>
>   	init_completion(&rproc->crash_comp);
> @@ -984,23 +990,11 @@ int rproc_trigger_recovery(struct rproc *rproc)
>   	/* TODO: make sure this works with rproc->power > 1 */
>   	rproc_shutdown(rproc);
>
> -	/* clean up remote vdev entries */
> -	list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
> -		rproc_remove_virtio_dev(rvdev);
> -
>   	/* wait until there is no more rproc users */
>   	wait_for_completion(&rproc->crash_comp);
>
> -	/* Free the copy of the resource table */
> -	kfree(rproc->cached_table);
I think this line should be part of patch 4 "Move handling of cached 
table to boot/shutdown"

Regards,
Loic
> -
> -	ret = rproc_add_virtio_devices(rproc);
> -	if (ret)
> -		return ret;
> -
>   	/*
> -	 * boot the remote processor up again, waiting for the async fw load to
> -	 * finish
> +	 * boot the remote processor up again
>   	 */
>   	rproc_boot(rproc);
>
>