From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 09/22] iommu: Add iommu_get_domain_for_dev function Date: Thu, 28 May 2015 18:41:32 +0200 Message-ID: <1432831305-11126-10-git-send-email-joro@8bytes.org> References: <1432831305-11126-1-git-send-email-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1432831305-11126-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: jroedel-l3A5Bk7waGM@public.gmane.org, Laurent Pinchart , Heiko Stuebner , Will Deacon , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Thierry Reding , Kukjin Kim , David Woodhouse List-Id: iommu@lists.linux-foundation.org From: Joerg Roedel This function can be used to request the current domain a device is attached to. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 18 ++++++++++++++++++ include/linux/iommu.h | 6 ++++++ 2 files changed, 24 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 7bce522..a0a38bd 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1076,6 +1076,24 @@ out_unlock: } EXPORT_SYMBOL_GPL(iommu_detach_device); +struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) +{ + struct iommu_domain *domain; + struct iommu_group *group; + + group = iommu_group_get(dev); + /* FIXME: Remove this when groups a mandatory for iommu drivers */ + if (group == NULL) + return NULL; + + domain = group->domain; + + iommu_group_put(group); + + return domain; +} +EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); + /* * IOMMU groups are really the natrual working unit of the IOMMU, but * the IOMMU API works on domains and devices. Bridge that gap by diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 0546b87..683a1c4 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -193,6 +193,7 @@ extern int iommu_attach_device(struct iommu_domain *domain, struct device *dev); extern void iommu_detach_device(struct iommu_domain *domain, struct device *dev); +extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot); extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, @@ -332,6 +333,11 @@ static inline void iommu_detach_device(struct iommu_domain *domain, { } +static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) +{ + return NULL; +} + static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, int gfp_order, int prot) { -- 1.9.1