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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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191218_054214_822226_7273E6AA X-CRM114-Status: GOOD ( 11.12 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:341 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (thierry.reding[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jean-Philippe Brucker , Will Deacon , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Christoph Hellwig , iommu@lists.linux-foundation.org, Robin Murphy , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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);