From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: iommu@lists.linux-foundation.org
Cc: joro@8bytes.org, linux-pci@vger.kernel.org,
jcrouse@codeaurora.org, alex.williamson@redhat.com,
Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com,
christian.koenig@amd.com, eric.auger@redhat.com,
kevin.tian@intel.com, yi.l.liu@intel.com, andrew.murray@arm.com,
will.deacon@arm.com, robin.murphy@arm.com, ashok.raj@intel.com,
baolu.lu@linux.intel.com, xuzaibo@huawei.com,
liguozhu@hisilicon.com, okaya@codeaurora.org,
bharatku@xilinx.com, ilias.apalodimas@linaro.org,
shunyong.yang@hxt-semitech.com
Subject: [PATCH v3 06/10] iommu/sva: Search mm by PASID
Date: Thu, 20 Sep 2018 18:00:42 +0100 [thread overview]
Message-ID: <20180920170046.20154-7-jean-philippe.brucker@arm.com> (raw)
In-Reply-To: <20180920170046.20154-1-jean-philippe.brucker@arm.com>
The fault handler will need to find an mm given its PASID. This is the
reason we have an IDR for storing address spaces, so hook it up.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
---
drivers/iommu/iommu-sva.c | 26 ++++++++++++++++++++++++++
include/linux/iommu.h | 7 +++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index 5ff8967cb213..ee86f00ee1b9 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -636,6 +636,32 @@ void iommu_sva_unbind_device_all(struct device *dev)
}
EXPORT_SYMBOL_GPL(iommu_sva_unbind_device_all);
+/**
+ * iommu_sva_find() - Find mm associated to the given PASID
+ * @pasid: Process Address Space ID assigned to the mm
+ *
+ * Returns the mm corresponding to this PASID, or NULL if not found. A reference
+ * to the mm is taken, and must be released with mmput().
+ */
+struct mm_struct *iommu_sva_find(int pasid)
+{
+ struct io_mm *io_mm;
+ struct mm_struct *mm = NULL;
+
+ spin_lock(&iommu_sva_lock);
+ io_mm = idr_find(&iommu_pasid_idr, pasid);
+ if (io_mm && io_mm_get_locked(io_mm)) {
+ if (mmget_not_zero(io_mm->mm))
+ mm = io_mm->mm;
+
+ io_mm_put_locked(io_mm);
+ }
+ spin_unlock(&iommu_sva_lock);
+
+ return mm;
+}
+EXPORT_SYMBOL_GPL(iommu_sva_find);
+
/**
* iommu_sva_init_device() - Initialize Shared Virtual Addressing for a device
* @dev: the device
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 429f3dc37a35..a457650b80de 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -987,6 +987,8 @@ extern int __iommu_sva_bind_device(struct device *dev, struct mm_struct *mm,
void *drvdata);
extern int __iommu_sva_unbind_device(struct device *dev, int pasid);
extern void iommu_sva_unbind_device_all(struct device *dev);
+extern struct mm_struct *iommu_sva_find(int pasid);
+
#else /* CONFIG_IOMMU_SVA */
static inline int iommu_sva_init_device(struct device *dev,
unsigned long features,
@@ -1016,6 +1018,11 @@ static inline int __iommu_sva_unbind_device(struct device *dev, int pasid)
static inline void iommu_sva_unbind_device_all(struct device *dev)
{
}
+
+static inline struct mm_struct *iommu_sva_find(int pasid)
+{
+ return NULL;
+}
#endif /* CONFIG_IOMMU_SVA */
#endif /* __LINUX_IOMMU_H */
--
2.18.0
next prev parent reply other threads:[~2018-09-20 17:25 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 17:00 [PATCH v3 00/10] Shared Virtual Addressing for the IOMMU Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 01/10] iommu: Introduce Shared Virtual Addressing API Jean-Philippe Brucker
[not found] ` <f406bcf7-4e54-9f1b-88eb-03fc642ffede@linux.intel.com>
2018-09-24 12:07 ` Jean-Philippe Brucker
2018-09-25 13:16 ` Joerg Roedel
2018-09-25 22:46 ` Jacob Pan
2018-09-26 10:14 ` Jean-Philippe Brucker
2018-09-26 12:48 ` Joerg Roedel
2018-09-20 17:00 ` [PATCH v3 02/10] iommu/sva: Bind process address spaces to devices Jean-Philippe Brucker
2018-09-23 3:05 ` Lu Baolu
2018-09-24 12:07 ` Jean-Philippe Brucker
2018-09-26 18:01 ` Jacob Pan
2018-09-27 15:06 ` Jean-Philippe Brucker
2018-09-28 1:14 ` Tian, Kevin
2018-09-20 17:00 ` [PATCH v3 03/10] iommu/sva: Manage process address spaces Jean-Philippe Brucker
2018-09-25 3:15 ` Lu Baolu
2018-09-25 10:32 ` Jean-Philippe Brucker
2018-09-26 3:12 ` Lu Baolu
2018-09-25 13:26 ` Joerg Roedel
2018-09-25 23:33 ` Lu Baolu
2018-09-26 10:20 ` Jean-Philippe Brucker
2018-09-26 12:45 ` Joerg Roedel
2018-09-26 13:50 ` Jean-Philippe Brucker
2018-09-27 3:22 ` Liu, Yi L
2018-09-27 13:37 ` Jean-Philippe Brucker
2018-10-08 8:29 ` Liu, Yi L
2018-09-26 22:58 ` Jacob Pan
2018-09-26 22:35 ` Jacob Pan
2018-10-03 17:52 ` Jean-Philippe Brucker
2018-10-15 20:53 ` Jacob Pan
2018-09-20 17:00 ` [PATCH v3 04/10] iommu/sva: Add a mm_exit callback for device drivers Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 05/10] iommu/sva: Track mm changes with an MMU notifier Jean-Philippe Brucker
2018-09-20 17:00 ` Jean-Philippe Brucker [this message]
2018-09-25 4:59 ` [PATCH v3 06/10] iommu/sva: Search mm by PASID Lu Baolu
2018-09-20 17:00 ` [PATCH v3 07/10] iommu: Add a page fault handler Jean-Philippe Brucker
2018-09-27 20:37 ` Jacob Pan
2018-10-03 17:46 ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 08/10] iommu/iopf: Handle mm faults Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 09/10] iommu/sva: Register page fault handler Jean-Philippe Brucker
2018-09-20 17:00 ` [RFC PATCH v3 10/10] iommu/sva: Add support for private PASIDs Jean-Philippe Brucker
2018-10-12 14:32 ` Jordan Crouse
2018-10-17 14:21 ` Jean-Philippe Brucker
2018-10-17 14:24 ` Jean-Philippe Brucker
2018-10-17 15:07 ` Jordan Crouse
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