iommu.lists.linux-foundation.org archive mirror
 help / color / mirror / Atom feed
From: Vijayanand Jitta <vjitta@codeaurora.org>
To: joro@8bytes.org, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org
Cc: vinmenon@codeaurora.org, kernel-team@android.com
Subject: Re: [PATCH 2/2] iommu/iova: Free global iova rcache on iova alloc failure
Date: Mon, 3 Aug 2020 15:30:48 +0530	[thread overview]
Message-ID: <29f44540-44f8-570d-886f-2090596a3b8e@codeaurora.org> (raw)
In-Reply-To: <1593785835-27250-2-git-send-email-vjitta@codeaurora.org>



On 7/3/2020 7:47 PM, vjitta@codeaurora.org wrote:
> From: Vijayanand Jitta <vjitta@codeaurora.org>
> 
> When ever an iova alloc request fails we free the iova
> ranges present in the percpu iova rcaches and then retry
> but the global iova rcache is not freed as a result we could
> still see iova alloc failure even after retry as global
> rcache is holding the iova's which can cause fragmentation.
> So, free the global iova rcache as well and then go for the
> retry.
> 
> Change-Id: Ib8236dc88ba5516b73d4fbf6bf8e68bbf09bbad2
> Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
> ---
>  drivers/iommu/iova.c | 23 +++++++++++++++++++++++
>  include/linux/iova.h |  6 ++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
> index 4e77116..5836c87 100644
> --- a/drivers/iommu/iova.c
> +++ b/drivers/iommu/iova.c
> @@ -442,6 +442,7 @@ struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn)
>  		flush_rcache = false;
>  		for_each_online_cpu(cpu)
>  			free_cpu_cached_iovas(cpu, iovad);
> +		free_global_cached_iovas(iovad);
>  		goto retry;
>  	}
>  
> @@ -1055,5 +1056,27 @@ void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad)
>  	}
>  }
>  
> +/*
> + * free all the IOVA ranges of global cache
> + */
> +void free_global_cached_iovas(struct iova_domain *iovad)
> +{
> +	struct iova_rcache *rcache;
> +	unsigned long flags;
> +	int i, j;
> +
> +	for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
> +		rcache = &iovad->rcaches[i];
> +		spin_lock_irqsave(&rcache->lock, flags);
> +		for (j = 0; j < rcache->depot_size; ++j) {
> +			iova_magazine_free_pfns(rcache->depot[j], iovad);
> +			iova_magazine_free(rcache->depot[j]);
> +			rcache->depot[j] = NULL;
> +		}
> +		rcache->depot_size = 0;
> +		spin_unlock_irqrestore(&rcache->lock, flags);
> +	}
> +}
> +
>  MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>");
>  MODULE_LICENSE("GPL");
> diff --git a/include/linux/iova.h b/include/linux/iova.h
> index a0637ab..a905726 100644
> --- a/include/linux/iova.h
> +++ b/include/linux/iova.h
> @@ -163,6 +163,7 @@ int init_iova_flush_queue(struct iova_domain *iovad,
>  struct iova *split_and_remove_iova(struct iova_domain *iovad,
>  	struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
>  void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
> +void free_global_cached_iovas(struct iova_domain *iovad);
>  #else
>  static inline int iova_cache_get(void)
>  {
> @@ -270,6 +271,11 @@ static inline void free_cpu_cached_iovas(unsigned int cpu,
>  					 struct iova_domain *iovad)
>  {
>  }
> +
> +static inline void free_global_cached_iovas(struct iova_domain *iovad)
> +{
> +}
> +
>  #endif
>  
>  #endif
> 

ping?
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
member of Code Aurora Forum, hosted by The Linux Foundation
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2020-08-03 10:01 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-03 14:17 [PATCH 1/2] iommu/iova: Retry from last rb tree node if iova search fails vjitta
2020-07-03 14:17 ` [PATCH 2/2] iommu/iova: Free global iova rcache on iova alloc failure vjitta
2020-08-03 10:00   ` Vijayanand Jitta [this message]
2020-08-12 15:16     ` Joerg Roedel
2020-08-13  5:36       ` Vijayanand Jitta
2020-09-14  8:43         ` John Garry
2020-08-03  9:59 ` [PATCH 1/2] iommu/iova: Retry from last rb tree node if iova search fails Vijayanand Jitta

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=29f44540-44f8-570d-886f-2090596a3b8e@codeaurora.org \
    --to=vjitta@codeaurora.org \
    --cc=iommu@lists.linux-foundation.org \
    --cc=joro@8bytes.org \
    --cc=kernel-team@android.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=vinmenon@codeaurora.org \
    --subject='Re: [PATCH 2/2] iommu/iova: Free global iova rcache on iova alloc failure' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).