linux-kernel - Re: [PATCH 13/13] remoteproc: Use sychronized interface of the IOMMU-API

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Date:   Thu, 24 Aug 2017 12:06:36 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 13/13] remoteproc: Use sychronized interface of the
 IOMMU-API

On Thu 17 Aug 05:56 PDT 2017, Joerg Roedel wrote:

> From: Joerg Roedel <jroedel@...e.de>
> 
> The map and unmap functions of the IOMMU-API changed their
> semantics: They do no longer guarantee that the hardware
> TLBs are synchronized with the page-table updates they made.
> 
> To make conversion easier, new synchronized functions have
> been introduced which give these guarantees again until the
> code is converted to use the new TLB-flush interface of the
> IOMMU-API, which allows certain optimizations.
> 
> But for now, just convert this code to use the synchronized
> functions so that it will behave as before.
> 
> Cc: Ohad Ben-Cohen <ohad@...ery.com>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: linux-remoteproc@...r.kernel.org
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/remoteproc/remoteproc_core.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 564061d..16db19c 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -553,7 +553,8 @@ static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
>  	if (!mapping)
>  		return -ENOMEM;
>  
> -	ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
> +	ret = iommu_map_sync(rproc->domain, rsc->da,
> +			     rsc->pa, rsc->len, rsc->flags);
>  	if (ret) {
>  		dev_err(dev, "failed to map devmem: %d\n", ret);
>  		goto out;
> @@ -661,8 +662,8 @@ static int rproc_handle_carveout(struct rproc *rproc,
>  			goto dma_free;
>  		}
>  
> -		ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len,
> -				rsc->flags);
> +		ret = iommu_map_sync(rproc->domain, rsc->da, dma, rsc->len,
> +				     rsc->flags);
>  		if (ret) {
>  			dev_err(dev, "iommu_map failed: %d\n", ret);
>  			goto free_mapping;
> @@ -823,7 +824,8 @@ static void rproc_resource_cleanup(struct rproc *rproc)
>  	list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) {
>  		size_t unmapped;
>  
> -		unmapped = iommu_unmap(rproc->domain, entry->da, entry->len);
> +		unmapped = iommu_unmap_sync(rproc->domain, entry->da,
> +					    entry->len);
>  		if (unmapped != entry->len) {
>  			/* nothing much to do besides complaining */
>  			dev_err(dev, "failed to unmap %u/%zu\n", entry->len,
> -- 
> 2.7.4
>