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[217.229.24.237]) by smtp.gmail.com with ESMTPSA id y6sm2578671wrl.17.2019.12.18.05.42.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2019 05:42:12 -0800 (PST) From: Thierry Reding To: Joerg Roedel Cc: Will Deacon , Robin Murphy , Jean-Philippe Brucker , Christoph Hellwig , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/5] iommu: Implement generic_iommu_put_resv_regions() Date: Wed, 18 Dec 2019 14:42:01 +0100 Message-Id: <20191218134205.1271740-2-thierry.reding@gmail.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191218134205.1271740-1-thierry.reding@gmail.com> References: <20191218134205.1271740-1-thierry.reding@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thierry Reding 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 --- 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 fdd40756dbc1..101f2d68eb6e 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); } +/** + * generic_iommu_put_resv_regions - 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 generic_iommu_put_resv_regions(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(generic_iommu_put_resv_regions); + 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..2e06b31579c2 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 generic_iommu_put_resv_regions(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); -- 2.24.1