linux-kernel - [PATCH v4 1/3] iommu/iova: Add free_all_cpu_cached

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Message-ID: <1607538189-237944-2-git-send-email-john.garry@huawei.com>
Date:   Thu, 10 Dec 2020 02:23:07 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <robin.murphy@....com>,
        <thunder.leizhen@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH v4 1/3] iommu/iova: Add free_all_cpu_cached_iovas()

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.garry@...wei.com>
Tested-by: Xiang Chen <chenxiang66@...ilicon.com>
Reviewed-by: Zhen Lei <thunder.leizhen@...wei.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 f9c35852018d..cf1aacda2fe4 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -238,6 +238,14 @@ 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);
@@ -435,15 +443,12 @@ 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);
 		free_global_cached_iovas(iovad);
 		goto retry;
 	}
-- 
2.26.2