dmaengine: ioatdma: adding shutdown support

The ioatdma needs to be queisced and block all additional op submission
during reboots. When NET_DMA was used, this caused issue as ops were still
being sent to ioatdma during reboots even though PCI BME has been turned
off. Even though NET_DMA has been deprecated, we need to prevent similar
situations. The shutdown handler should address that.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 1bc084986646..8f4e607d5817 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -82,8 +82,9 @@ struct ioatdma_device {
         struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
         struct dma_device dma_dev;
         u8 version;
-        struct msix_entry msix_entries[4];
-        struct ioatdma_chan *idx[4];
+#define IOAT_MAX_CHANS 4
+        struct msix_entry msix_entries[IOAT_MAX_CHANS];
+        struct ioatdma_chan *idx[IOAT_MAX_CHANS];
         struct dca_provider *dca;
         enum ioat_irq_mode irq_mode;
         u32 cap;
@@ -95,6 +96,7 @@ struct ioatdma_chan {
         dma_addr_t last_completion;
         spinlock_t cleanup_lock;
         unsigned long state;
+        #define IOAT_CHAN_DOWN 0
         #define IOAT_COMPLETION_ACK 1
         #define IOAT_RESET_PENDING 2
         #define IOAT_KOBJ_INIT_FAIL 3