On 2020/11/17 18:25, John Garry wrote:
> Add a helper function to free the CPU rcache for all online CPUs.
>
> There also exists a function of the same name in
> drivers/iommu/intel/iommu.c, but the parameters are different, and there
> should be no conflict.
>
> Signed-off-by: John Garry <john.ga...@huawei.com>
> ---
> drivers/iommu/iova.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
> index 30d969a4c5fd..81b7399dd5e8 100644
> --- a/drivers/iommu/iova.c
> +++ b/drivers/iommu/iova.c
> @@ -227,6 +227,14 @@ static int __alloc_and_insert_iova_range(struct
> iova_domain *iovad,
> return -ENOMEM;
> }
>
> +static void free_all_cpu_cached_iovas(struct iova_domain *iovad)
> +{
> + unsigned int cpu;
> +
> + for_each_online_cpu(cpu)
> + free_cpu_cached_iovas(cpu, iovad);
> +}
> +
> static struct kmem_cache *iova_cache;
> static unsigned int iova_cache_users;
> static DEFINE_MUTEX(iova_cache_mutex);
> @@ -422,15 +430,12 @@ alloc_iova_fast(struct iova_domain *iovad, unsigned
> long size,
> retry:
> new_iova = alloc_iova(iovad, size, limit_pfn, true);
> if (!new_iova) {
> - unsigned int cpu;
> -
> if (!flush_rcache)
> return 0;
>
> /* Try replenishing IOVAs by flushing rcache. */
> flush_rcache = false;
> - for_each_online_cpu(cpu)
> - free_cpu_cached_iovas(cpu, iovad);
> + free_all_cpu_cached_iovas(iovad);
> goto retry;
> }
>
Reviewed-by: Zhen Lei <thunder.leiz...@huawei.com>
>
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