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drivers/vfio: Support EEH error injection 

The patch adds one more EEH sub-command (VFIO_EEH_PE_INJECT_ERR)
to inject the specified EEH error, which is represented by
(struct vfio_eeh_pe_err), to the indicated PE for testing purpose.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan 2015-03-26 16:42:09 +11:00 committed by Michael Ellerman
parent ec33d36e5a
commit 68cbbc3a9d
3 changed files with 35 additions and 1 deletions
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12
Documentation/vfio.txt
View File

@ -385,6 +385,18 @@ The code flow from the example above should be slightly changed:
....
/* Inject EEH error, which is expected to be caused by 32-bits
* config load.
*/
pe_op.op = VFIO_EEH_PE_INJECT_ERR;
pe_op.err.type = EEH_ERR_TYPE_32;
pe_op.err.func = EEH_ERR_FUNC_LD_CFG_ADDR;
pe_op.err.addr = 0ul;
pe_op.err.mask = 0ul;
ioctl(container, VFIO_EEH_PE_OP, &pe_op);
....
/* When 0xFF's returned from reading PCI config space or IO BARs
* of the PCI device. Check the PE's state to see if that has been
* frozen.

10
drivers/vfio/vfio_spapr_eeh.c
View File

@ -85,6 +85,16 @@ long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
case VFIO_EEH_PE_CONFIGURE:
ret = eeh_pe_configure(pe);
break;
case VFIO_EEH_PE_INJECT_ERR:
minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
if (op.argsz < minsz)
return -EINVAL;
if (copy_from_user(&op, (void __user *)arg, minsz))
return -EFAULT;
ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
op.err.addr, op.err.mask);
break;
default:
ret = -EINVAL;
}

14
include/uapi/linux/vfio.h
View File

@ -470,12 +470,23 @@ struct vfio_iommu_spapr_tce_info {
* - unfreeze IO/DMA for frozen PE;
* - read PE state;
* - reset PE;
* - configure PE.
* - configure PE;
* - inject EEH error.
*/
struct vfio_eeh_pe_err {
__u32 type;
__u32 func;
__u64 addr;
__u64 mask;
};
struct vfio_eeh_pe_op {
__u32 argsz;
__u32 flags;
__u32 op;
union {
struct vfio_eeh_pe_err err;
};
};
#define VFIO_EEH_PE_DISABLE 0 /* Disable EEH functionality */
@ -492,6 +503,7 @@ struct vfio_eeh_pe_op {
#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_INJECT_ERR 9 /* Inject EEH error */
#define VFIO_EEH_PE_OP _IO(VFIO_TYPE, VFIO_BASE + 21)