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Peter Anvin" , David Woodhouse , iommu , linux-kernel , linux-s390 , linuxppc-dev , x86 , linux-ia64 Subject: [PATCH v5 3/6] iommu: add iommu_default_dma_mode_get/set() helper Date: Tue, 9 Apr 2019 20:53:05 +0800 Message-ID: <20190409125308.18304-4-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.19.2.windows.1 In-Reply-To: <20190409125308.18304-1-thunder.leizhen@huawei.com> References: <20190409125308.18304-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.177.23.164] X-CFilter-Loop: Reflected X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Hanjun Guo , Zhen Lei Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Also add IOMMU_DMA_MODE_IS_{STRICT|LAZT|PASSTHROUGH}() to make the code looks cleaner. There is no functional change, just prepare for the following patches. Signed-off-by: Zhen Lei --- drivers/iommu/iommu.c | 18 ++++++++++++++---- include/linux/iommu.h | 18 ++++++++++++++++++ 2 files changed, 32 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index f4171bf4b46eaeb..86239dd46003fd4 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -195,6 +195,17 @@ static int __init iommu_dma_mode_setup(char *str) } early_param("iommu.dma_mode", iommu_dma_mode_setup); +int iommu_default_dma_mode_get(void) +{ + return iommu_default_dma_mode; +} + +void iommu_default_dma_mode_set(int mode) +{ + WARN_ON(mode > IOMMU_DMA_MODE_PASSTHROUGH); + iommu_default_dma_mode = mode; +} + static ssize_t iommu_group_attr_show(struct kobject *kobj, struct attribute *__attr, char *buf) { @@ -1136,9 +1147,8 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) */ if (!group->default_domain) { struct iommu_domain *dom; - int def_domain_type = - (iommu_default_dma_mode == IOMMU_DMA_MODE_PASSTHROUGH) - ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; + int def_domain_type = IOMMU_DMA_MODE_IS_PASSTHROUGH() ? + IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; dom = __iommu_domain_alloc(dev->bus, def_domain_type); if (!dom && def_domain_type != IOMMU_DOMAIN_DMA) { @@ -1154,7 +1164,7 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) if (!group->domain) group->domain = dom; - if (dom && (iommu_default_dma_mode == IOMMU_DMA_MODE_LAZY)) { + if (dom && IOMMU_DMA_MODE_IS_LAZY()) { int attr = 1; iommu_domain_set_attr(dom, DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, diff --git a/include/linux/iommu.h b/include/linux/iommu.h index c3f4e3416176496..3668a8b3846996a 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -46,6 +46,12 @@ #define IOMMU_DMA_MODE_STRICT 0x0 #define IOMMU_DMA_MODE_LAZY 0x1 #define IOMMU_DMA_MODE_PASSTHROUGH 0x2 +#define IOMMU_DMA_MODE_IS_STRICT() \ + (iommu_default_dma_mode_get() == IOMMU_DMA_MODE_STRICT) +#define IOMMU_DMA_MODE_IS_LAZY() \ + (iommu_default_dma_mode_get() == IOMMU_DMA_MODE_LAZY) +#define IOMMU_DMA_MODE_IS_PASSTHROUGH() \ + (iommu_default_dma_mode_get() == IOMMU_DMA_MODE_PASSTHROUGH) struct iommu_ops; struct iommu_group; @@ -421,6 +427,9 @@ static inline void dev_iommu_fwspec_set(struct device *dev, int iommu_probe_device(struct device *dev); void iommu_release_device(struct device *dev); +extern int iommu_default_dma_mode_get(void); +extern void iommu_default_dma_mode_set(int mode); + #else /* CONFIG_IOMMU_API */ struct iommu_ops {}; @@ -705,6 +714,15 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) return NULL; } +static inline int iommu_default_dma_mode_get(void) +{ + return IOMMU_DMA_MODE_PASSTHROUGH; +} + +static inline void iommu_default_dma_mode_set(int mode) +{ +} + #endif /* CONFIG_IOMMU_API */ #ifdef CONFIG_IOMMU_DEBUGFS -- 1.8.3