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authorJan Kiszka <jan.kiszka@siemens.com>2011-09-12 18:57:56 +0200
committerAvi Kivity <avi@redhat.com>2011-09-25 19:52:45 +0300
commitcc0793968a602c9b40f7b99c401674750aa99e06 (patch)
tree9ffe6978abe91b4e8cc330e530204e08844e194c /virt/kvm/assigned-dev.c
parent9bc5791d4aa78b72abd76f506c0a391a54abc4d1 (diff)
downloadlinux-linaro-stable-cc0793968a602c9b40f7b99c401674750aa99e06.tar.gz
KVM: Split up MSI-X assigned device IRQ handler
The threaded IRQ handler for MSI-X has almost nothing in common with the INTx/MSI handler. Move its code into a dedicated handler. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/assigned-dev.c')
-rw-r--r--virt/kvm/assigned-dev.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 84ead5489650..7debe8c9e10e 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -58,8 +58,6 @@ static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
{
struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
- u32 vector;
- int index;
if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
spin_lock(&assigned_dev->intx_lock);
@@ -68,20 +66,28 @@ static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
spin_unlock(&assigned_dev->intx_lock);
}
- if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
- index = find_index_from_host_irq(assigned_dev, irq);
- if (index >= 0) {
- vector = assigned_dev->
- guest_msix_entries[index].vector;
- kvm_set_irq(assigned_dev->kvm,
- assigned_dev->irq_source_id, vector, 1);
- }
- } else
+ kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
+ assigned_dev->guest_irq, 1);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef __KVM_HAVE_MSIX
+static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
+{
+ struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+ int index = find_index_from_host_irq(assigned_dev, irq);
+ u32 vector;
+
+ if (index >= 0) {
+ vector = assigned_dev->guest_msix_entries[index].vector;
kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
- assigned_dev->guest_irq, 1);
+ vector, 1);
+ }
return IRQ_HANDLED;
}
+#endif
/* Ack the irq line for an assigned device */
static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
@@ -279,7 +285,7 @@ static int assigned_device_enable_host_msix(struct kvm *kvm,
for (i = 0; i < dev->entries_nr; i++) {
r = request_threaded_irq(dev->host_msix_entries[i].vector,
- NULL, kvm_assigned_dev_thread,
+ NULL, kvm_assigned_dev_thread_msix,
0, dev->irq_name, dev);
if (r)
goto err;