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authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2013-04-23 01:32:34 +0400
committerJoerg Roedel <joro@8bytes.org>2013-04-23 16:34:26 +0400
commit3f398bc7762adcd860bd2acce18465a106f47325 (patch)
tree120d9bde4c592f3561d1f218fbea00b11b631393 /drivers/iommu/amd_iommu_init.c
parentd3263bc29706e42f74d8800807c2dedf320d77f1 (diff)
downloadlinux-3f398bc7762adcd860bd2acce18465a106f47325.tar.xz
iommu/AMD: Per-thread IOMMU Interrupt Handling
In the current interrupt handling scheme, there are as many threads as the number of IOMMUs. Each thread is created and assigned to an IOMMU at the time of registering interrupt handlers (request_threaded_irq). When an IOMMU HW generates an interrupt, the irq handler (top half) wakes up the corresponding thread to process event and PPR logs of all IOMMUs starting from the 1st IOMMU. In the system with multiple IOMMU,this handling scheme complicates the synchronization of the IOMMU data structures and status registers as there could be multiple threads competing for the same IOMMU while the other IOMMU could be left unhandled. To simplify, this patch is proposing a different interrupt handling scheme by having each thread only managing interrupts of the corresponding IOMMU. This can be achieved by passing the struct amd_iommu when registering the interrupt handlers. This structure is unique for each IOMMU and can be used by the bottom half thread to identify the IOMMU to be handled instead of calling for_each_iommu. Besides this also eliminate the needs to lock the IOMMU for processing event and PPR logs. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 976794166481..3d3d6cd52d47 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1324,7 +1324,7 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
amd_iommu_int_handler,
amd_iommu_int_thread,
0, "AMD-Vi",
- iommu->dev);
+ iommu);
if (r) {
pci_disable_msi(iommu->dev);