x86/amd-iommu: Use threaded interupt handler

Move the interupt handling for the iommu into the interupt
thread to reduce latencies and prepare interupt handling for
pri handling.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

3 files changed, 12 insertions, 5 deletions

diff --git a/arch/x86/include/asm/amd_iommu_proto.h b/arch/x86/include/asm/amd_iommu_proto.h
index a4ae6c3875eb..55d95eb789b3 100644
--- a/arch/x86/include/asm/amd_iommu_proto.h
+++ b/arch/x86/include/asm/amd_iommu_proto.h
@@ -23,6 +23,7 @@
 
 extern int amd_iommu_init_dma_ops(void);
 extern int amd_iommu_init_passthrough(void);
+extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
 extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
 extern void amd_iommu_apply_erratum_63(u16 devid);
 extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index dc5dddafe5c2..873e7e1ead7b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -366,7 +366,7 @@ static void iommu_poll_events(struct amd_iommu *iommu)
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
-irqreturn_t amd_iommu_int_handler(int irq, void *data)
+irqreturn_t amd_iommu_int_thread(int irq, void *data)
 {
         struct amd_iommu *iommu;
 
@@ -376,6 +376,11 @@ irqreturn_t amd_iommu_int_handler(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+irqreturn_t amd_iommu_int_handler(int irq, void *data)
+{
+        return IRQ_WAKE_THREAD;
+}
+
 /****************************************************************************
  *
  * IOMMU command queuing functions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 28b078133688..9179c21120a8 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1034,10 +1034,11 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
         if (pci_enable_msi(iommu->dev))
                 return 1;
 
-        r = request_irq(iommu->dev->irq, amd_iommu_int_handler,
-                        IRQF_SAMPLE_RANDOM,
-                        "AMD-Vi",
-                        NULL);
+        r = request_threaded_irq(iommu->dev->irq,
+                                 amd_iommu_int_handler,
+                                 amd_iommu_int_thread,
+                                 0, "AMD-Vi",
+                                 iommu->dev);
 
         if (r) {
                 pci_disable_msi(iommu->dev);