From: chenxiang <chenxiang66@hisilicon.com>
To: <robin.murphy@arm.com>, <will@kernel.org>, <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org, linuxarm@openeuler.org,
linuxarm@huawei.com
Subject: [PATCH 4/4] iommu: free cached iovas when rmmod the driver of the last device in the group
Date: Mon, 7 Jun 2021 10:43:02 +0800 [thread overview]
Message-ID: <1623033782-57907-5-git-send-email-chenxiang66@hisilicon.com> (raw)
In-Reply-To: <1623033782-57907-1-git-send-email-chenxiang66@hisilicon.com>
From: Xiang Chen <chenxiang66@hisilicon.com>
When rmmod the driver of the last device in the domain, cached iovas are
not used and it is better to free them to save memories.
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
---
drivers/iommu/iommu.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 808ab70..d318d80 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -9,6 +9,7 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/bug.h>
+#include <linux/dma-iommu.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
@@ -16,6 +17,7 @@
#include <linux/errno.h>
#include <linux/iommu.h>
#include <linux/idr.h>
+#include <linux/iova.h>
#include <linux/notifier.h>
#include <linux/err.h>
#include <linux/pci.h>
@@ -1667,6 +1669,11 @@ static int iommu_bus_notifier(struct notifier_block *nb,
group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
break;
case BUS_NOTIFY_UNBOUND_DRIVER:
+ if (iommu_group_device_count(group) == 1) {
+ struct iommu_domain *domain = group->domain;
+
+ free_rcache_cached_iovas(iommu_domain_to_iova(domain));
+ }
group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
break;
}
--
2.8.1
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next prev parent reply other threads:[~2021-06-07 2:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 2:42 [PATCH 0/4] Free cached iovas when rmmod the driver of the last device in group chenxiang
2021-06-07 2:42 ` [PATCH 1/4] iommu/iova: add a function to free all rcached iovas and export it chenxiang
2021-06-07 2:43 ` [PATCH 2/4] iommu/iova: use function free_rcache_cached_iovas() to free all rcached iovas chenxiang
2021-06-07 2:43 ` [PATCH 3/4] dma-iommu: add a interface to get iova_domain from iommu domain chenxiang
2021-06-07 2:43 ` chenxiang [this message]
2021-06-07 11:23 ` [PATCH 0/4] Free cached iovas when rmmod the driver of the last device in group Robin Murphy
2021-06-08 7:50 ` [Linuxarm] " chenxiang (M)
2021-06-08 14:17 ` Robin Murphy
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