From: Thierry Reding <thierry.reding@gmail.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
David Woodhouse <dwmw2@infradead.org>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Christoph Hellwig <hch@infradead.org>,
iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/5] iommu: Implement iommu_put_resv_regions_simple()
Date: Mon, 9 Dec 2019 15:50:03 +0100 [thread overview]
Message-ID: <20191209145007.2433144-2-thierry.reding@gmail.com> (raw)
In-Reply-To: <20191209145007.2433144-1-thierry.reding@gmail.com>
From: Thierry Reding <treding@nvidia.com>
Implement a generic function for removing reserved regions. This can be
used by drivers that don't do anything fancy with these regions other
than allocating memory for them.
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/iommu/iommu.c | 19 +++++++++++++++++++
include/linux/iommu.h | 2 ++
2 files changed, 21 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index db7bfd4f2d20..a46d3bcafa06 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2229,6 +2229,25 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
ops->put_resv_regions(dev, list);
}
+/**
+ * iommu_put_resv_regions_simple - Reserved region driver helper
+ * @dev: device for which to free reserved regions
+ * @list: reserved region list for device
+ *
+ * IOMMU drivers can use this to implement their .put_resv_regions() callback
+ * for simple reservations. Memory allocated for each reserved region will be
+ * freed. If an IOMMU driver allocates additional resources per region, it is
+ * going to have to implement a custom callback.
+ */
+void iommu_put_resv_regions_simple(struct device *dev, struct list_head *list)
+{
+ struct iommu_resv_region *entry, *next;
+
+ list_for_each_entry_safe(entry, next, list, list)
+ kfree(entry);
+}
+EXPORT_SYMBOL(iommu_put_resv_regions_simple);
+
struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
size_t length, int prot,
enum iommu_resv_type type)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 1b4fbe703950..a249aa55596b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -477,6 +477,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
+extern void iommu_put_resv_regions_simple(struct device *dev,
+ struct list_head *list);
extern int iommu_request_dm_for_dev(struct device *dev);
extern int iommu_request_dma_domain_for_dev(struct device *dev);
extern void iommu_set_default_passthrough(bool cmd_line);
--
2.23.0
next prev parent reply other threads:[~2019-12-09 14:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 14:50 [PATCH v2 0/5] iommu: Implement iommu_put_resv_regions_simple() Thierry Reding
2019-12-09 14:50 ` Thierry Reding [this message]
2019-12-09 14:50 ` [PATCH v2 2/5] iommu: arm: Use iommu_put_resv_regions_simple() Thierry Reding
2019-12-17 10:59 ` Will Deacon
2019-12-09 14:50 ` [PATCH v2 3/5] iommu: amd: " Thierry Reding
2019-12-09 14:50 ` [PATCH v2 4/5] iommu: intel: " Thierry Reding
2019-12-09 14:50 ` [PATCH v2 5/5] iommu: virtio: " Thierry Reding
2019-12-11 15:44 ` Jean-Philippe Brucker
2019-12-17 10:08 ` [PATCH v2 0/5] iommu: Implement iommu_put_resv_regions_simple() Joerg Roedel
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