drivers/vfio: EEH support for VFIO PCI device

The patch adds new IOCTL commands for sPAPR VFIO container device
to support EEH functionality for PCI devices, which have been passed
through from host to somebody else via VFIO.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Alexander Graf <agraf@suse.de>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index cb9023d4f063..6612974c64bf 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -30,6 +30,9 @@
  */
 #define VFIO_DMA_CC_IOMMU               4
 
+/* Check if EEH is supported */
+#define VFIO_EEH                        5
+
 /*
  * The IOCTL interface is designed for extensibility by embedding the
  * structure length (argsz) and flags into structures passed between
@@ -455,6 +458,37 @@ struct vfio_iommu_spapr_tce_info {
 
 #define VFIO_IOMMU_SPAPR_TCE_GET_INFO   _IO(VFIO_TYPE, VFIO_BASE + 12)
 
+/*
+ * EEH PE operation struct provides ways to:
+ * - enable/disable EEH functionality;
+ * - unfreeze IO/DMA for frozen PE;
+ * - read PE state;
+ * - reset PE;
+ * - configure PE.
+ */
+struct vfio_eeh_pe_op {
+        __u32 argsz;
+        __u32 flags;
+        __u32 op;
+};
+
+#define VFIO_EEH_PE_DISABLE             0       /* Disable EEH functionality */
+#define VFIO_EEH_PE_ENABLE              1       /* Enable EEH functionality  */
+#define VFIO_EEH_PE_UNFREEZE_IO         2       /* Enable IO for frozen PE   */
+#define VFIO_EEH_PE_UNFREEZE_DMA        3       /* Enable DMA for frozen PE  */
+#define VFIO_EEH_PE_GET_STATE           4       /* PE state retrieval        */
+#define  VFIO_EEH_PE_STATE_NORMAL       0       /* PE in functional state    */
+#define  VFIO_EEH_PE_STATE_RESET        1       /* PE reset in progress      */
+#define  VFIO_EEH_PE_STATE_STOPPED      2       /* Stopped DMA and IO        */
+#define  VFIO_EEH_PE_STATE_STOPPED_DMA  4       /* Stopped DMA only          */
+#define  VFIO_EEH_PE_STATE_UNAVAIL      5       /* State unavailable         */
+#define VFIO_EEH_PE_RESET_DEACTIVATE    5       /* Deassert PE reset         */
+#define VFIO_EEH_PE_RESET_HOT           6       /* Assert hot reset          */
+#define VFIO_EEH_PE_RESET_FUNDAMENTAL   7       /* Assert fundamental reset  */
+#define VFIO_EEH_PE_CONFIGURE           8       /* PE configuration          */
+
+#define VFIO_EEH_PE_OP                  _IO(VFIO_TYPE, VFIO_BASE + 21)
+
 /* ***************************************************************** */
 
 #endif /* _UAPIVFIO_H */