I/OAT: Add support for MSI and MSI-X

Add support for MSI and MSI-X interrupt handling, including the ability
to choose the desired interrupt method.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
[bunk@kernel.org: drivers/dma/ioat_dma.c: make 3 functions static]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index 0b8ffbde1e61..2abf0b88a973 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -28,6 +28,14 @@
 #include <linux/cache.h>
 #include <linux/pci_ids.h>
 
+enum ioat_interrupt {
+        none = 0,
+        msix_multi_vector = 1,
+        msix_single_vector = 2,
+        msi = 3,
+        intx = 4,
+};
+
 #define IOAT_LOW_COMPLETION_MASK        0xffffffc0
 
 /**
@@ -46,6 +54,9 @@ struct ioatdma_device {
         struct pci_pool *completion_pool;
         struct dma_device common;
         u8 version;
+        enum ioat_interrupt irq_mode;
+        struct msix_entry msix_entries[4];
+        struct ioat_dma_chan *idx[4];
 };
 
 /**
@@ -94,6 +105,7 @@ struct ioat_dma_chan {
                         u32 high;
                 };
         } *completion_virt;
+        struct tasklet_struct cleanup_task;
 };
 
 /* wrapper around hardware descriptor format + additional software fields */