cxl: Adapter failure handling

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>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index e16046292dd6..eec468f1612f 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -76,7 +76,7 @@ static int __afu_open(struct inode *inode, struct file *file, bool master)
         if (!afu->current_mode)
                 goto err_put_afu;
 
-        if (!cxl_ops->link_ok(adapter)) {
+        if (!cxl_ops->link_ok(adapter, afu)) {
                 rc = -EIO;
                 goto err_put_afu;
         }
@@ -257,7 +257,7 @@ long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         if (ctx->status == CLOSED)
                 return -EIO;
 
-        if (!cxl_ops->link_ok(ctx->afu->adapter))
+        if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
                 return -EIO;
 
         pr_devel("afu_ioctl\n");
@@ -287,7 +287,7 @@ int afu_mmap(struct file *file, struct vm_area_struct *vm)
         if (ctx->status != STARTED)
                 return -EIO;
 
-        if (!cxl_ops->link_ok(ctx->afu->adapter))
+        if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
                 return -EIO;
 
         return cxl_context_iomap(ctx, vm);
@@ -334,7 +334,7 @@ ssize_t afu_read(struct file *file, char __user *buf, size_t count,
         int rc;
         DEFINE_WAIT(wait);
 
-        if (!cxl_ops->link_ok(ctx->afu->adapter))
+        if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
                 return -EIO;
 
         if (count < CXL_READ_MIN_SIZE)
@@ -347,7 +347,7 @@ ssize_t afu_read(struct file *file, char __user *buf, size_t count,
                 if (ctx_event_pending(ctx))
                         break;
 
-                if (!cxl_ops->link_ok(ctx->afu->adapter)) {
+                if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
                         rc = -EIO;
                         goto out;
                 }