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cxl: Adapter failure handling

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Check the AFU state whenever an API is called. The hypervisor may
issue a reset of the adapter when it detects a fault. When it happens,
it launches an error recovery which will either move the AFU to a
permanent failure state, or in the disabled state.
If the AFU is found to be disabled, detach all existing contexts from
it before issuing a AFU reset to re-enable it.

Before detaching contexts, notify any kernel driver through the EEH
callbacks of the AFU pci device.

Co-authored-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Lombard
2016-03-04 12:26:41 +01:00
committed by Michael Ellerman
parent d601ea918b
commit 0d400f77c1
7 changed files with 198 additions and 35 deletions
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2
drivers/misc/cxl/context.c
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@@ -220,7 +220,7 @@ int __detach_context(struct cxl_context *ctx)
* If detach fails when hw is down, we don't care.
*/
WARN_ON(cxl_ops->detach_process(ctx) &&
cxl_ops->link_ok(ctx->afu->adapter));
cxl_ops->link_ok(ctx->afu->adapter, ctx->afu));
flush_work(&ctx->fault_work); /* Only needed for dedicated process */
/* release the reference to the group leader and mm handling pid */