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charset="UTF-8" X-Stat-Signature: md43nn834dt3ckgeab3wdajw85j1txax X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: EB61AC0009 X-HE-Tag: 1790895746-688286 X-HE-Meta: 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 k7K/SZde 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce struct xarray reclaim_list to struct iommu_domain. This will serve as the O(1) storage where the fast path stores empty directories by their associated IOVA. IOVA is required by the shrinker to perform a top-down tree walk to safely locate and prune the parent pointer. While xa_store requires a localized spinlock, this path is only triggered when a directory reaches a completely empty state, keeping the vast majority of mapping operations lock-free. Signed-off-by: Pranjal Shrivastava --- drivers/iommu/iommu.c | 2 ++ include/linux/iommu.h | 3 +++ 2 files changed, 5 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index cd1bca7ede9a..5d814854d825 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2074,6 +2074,7 @@ static void iommu_domain_init(struct iommu_domain *domain, unsigned int type, domain->owner = ops; if (!domain->ops) domain->ops = ops->default_domain_ops; + xa_init(&domain->reclaim_list); } static struct iommu_domain * @@ -2126,6 +2127,7 @@ EXPORT_SYMBOL_GPL(iommu_paging_domain_alloc_flags); void iommu_domain_free(struct iommu_domain *domain) { + xa_destroy(&domain->reclaim_list); switch (domain->cookie_type) { case IOMMU_COOKIE_DMA_IOVA: iommu_put_dma_cookie(domain); diff --git a/include/linux/iommu.h b/include/linux/iommu.h index ac43b8b93f14..b9611631ea80 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -14,6 +14,7 @@ #include #include #include +#include #include #define IOMMU_READ (1 << 0) @@ -249,6 +250,8 @@ struct iommu_domain { struct list_head next; }; }; + + struct xarray reclaim_list; }; static inline bool iommu_is_dma_domain(struct iommu_domain *domain) -- 2.56.0.rc1.315.gc6ed9934b7-goog