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path: root/drivers/vfio/vfio_spapr_eeh.c
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Diffstat (limited to 'drivers/vfio/vfio_spapr_eeh.c')
-rw-r--r--drivers/vfio/vfio_spapr_eeh.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_spapr_eeh.c b/drivers/vfio/vfio_spapr_eeh.c
new file mode 100644
index 000000000000..f834b4ce1431
--- /dev/null
+++ b/drivers/vfio/vfio_spapr_eeh.c
@@ -0,0 +1,87 @@
+/*
+ * EEH functionality support for VFIO devices. The feature is only
+ * available on sPAPR compatible platforms.
+ *
+ * Copyright Gavin Shan, IBM Corporation 2014.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <asm/eeh.h>
+
+/* We might build address mapping here for "fast" path later */
+int vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
+{
+ return eeh_dev_open(pdev);
+}
+
+void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
+{
+ eeh_dev_release(pdev);
+}
+
+long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
+ unsigned int cmd, unsigned long arg)
+{
+ struct eeh_pe *pe;
+ struct vfio_eeh_pe_op op;
+ unsigned long minsz;
+ long ret = -EINVAL;
+
+ switch (cmd) {
+ case VFIO_CHECK_EXTENSION:
+ if (arg == VFIO_EEH)
+ ret = eeh_enabled() ? 1 : 0;
+ else
+ ret = 0;
+ break;
+ case VFIO_EEH_PE_OP:
+ pe = eeh_iommu_group_to_pe(group);
+ if (!pe)
+ return -ENODEV;
+
+ minsz = offsetofend(struct vfio_eeh_pe_op, op);
+ if (copy_from_user(&op, (void __user *)arg, minsz))
+ return -EFAULT;
+ if (op.argsz < minsz || op.flags)
+ return -EINVAL;
+
+ switch (op.op) {
+ case VFIO_EEH_PE_DISABLE:
+ ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
+ break;
+ case VFIO_EEH_PE_ENABLE:
+ ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
+ break;
+ case VFIO_EEH_PE_UNFREEZE_IO:
+ ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
+ break;
+ case VFIO_EEH_PE_UNFREEZE_DMA:
+ ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
+ break;
+ case VFIO_EEH_PE_GET_STATE:
+ ret = eeh_pe_get_state(pe);
+ break;
+ case VFIO_EEH_PE_RESET_DEACTIVATE:
+ ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
+ break;
+ case VFIO_EEH_PE_RESET_HOT:
+ ret = eeh_pe_reset(pe, EEH_RESET_HOT);
+ break;
+ case VFIO_EEH_PE_RESET_FUNDAMENTAL:
+ ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
+ break;
+ case VFIO_EEH_PE_CONFIGURE:
+ ret = eeh_pe_configure(pe);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ }
+
+ return ret;
+}