ioatdma: channel reset scheme fixup on Intel Atom S1200 platforms
The Intel Atom S1200 family ioatdma changed the channel reset behavior.
It does a reset similar to PCI FLR by resetting all the MSIX
registers. We have to re-init msix interrupts because of this. This
workaround is only specific to this platform and is not expected to carry
over to the later generations.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 9285caa..b16902c 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -48,6 +48,14 @@
*/
#define NULL_DESC_BUFFER_SIZE 1
+enum ioat_irq_mode {
+ IOAT_NOIRQ = 0,
+ IOAT_MSIX,
+ IOAT_MSIX_SINGLE,
+ IOAT_MSI,
+ IOAT_INTX
+};
+
/**
* struct ioatdma_device - internal representation of a IOAT device
* @pdev: PCI-Express device
@@ -77,6 +85,7 @@
struct msix_entry msix_entries[4];
struct ioat_chan_common *idx[4];
struct dca_provider *dca;
+ enum ioat_irq_mode irq_mode;
void (*intr_quirk)(struct ioatdma_device *device);
int (*enumerate_channels)(struct ioatdma_device *device);
int (*reset_hw)(struct ioat_chan_common *chan);
@@ -341,6 +350,7 @@
dma_addr_t *phys_complete);
void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type);
void ioat_kobject_del(struct ioatdma_device *device);
+int ioat_dma_setup_interrupts(struct ioatdma_device *device);
extern const struct sysfs_ops ioat_sysfs_ops;
extern struct ioat_sysfs_entry ioat_version_attr;
extern struct ioat_sysfs_entry ioat_cap_attr;
