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    Subject[PATCH 2/2] iommu/iova: Free global iova rcache on iova alloc failure
    Date
    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
    --
    QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
    1.9.1
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