[Skiboot] [PATCH v2 2/8] core/pci: Introduce a new pci_slot_op named completed_sm_run()

[Andrew Donnellan]

On 10/12/18 1:17 am, Vaibhav Jain wrote:
> At times we need to perform some cleanup activities when the Opal PCI
> state machine that perform creset/freset/hreset (driven by
> pci_slot_ops->run_sm which) of a slot completes. One example can be to
> mark CAPP attached to a PHB, as deactivated when creset/freset of a
> CAPI card slot is completed.
> 
> However the calls to pci_slot_ops->run_sm() is scattered through out
> the code and patching each call site to check for the return value and
> perform custom cleanup tacks is difficult.
> 
> Hence this patch introduces a new pci_slot_ops named
> completed_sm_run() which should be called when pci_slot_ops->run_sm()
> determines that the reset state machine is complete. This provides a
> more centralized way to handle slot related cleanup activities.
> 
> Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>

Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

> ---
> Change-log
> 
> v2: Update the callback signature to return a int64_t back to
>      caller. [Andrew]
> ---
>   core/pci-slot.c    | 6 +++++-
>   include/pci-slot.h | 1 +
>   2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/core/pci-slot.c b/core/pci-slot.c
> index 71d2769e..497d0a47 100644
> --- a/core/pci-slot.c
> +++ b/core/pci-slot.c
> @@ -104,9 +104,13 @@ static int64_t pci_slot_run_sm(struct pci_slot *slot)
>   		prlog(PR_ERR, PCI_SLOT_PREFIX
>   		      "Invalid state %08x\n", slot->id, slot->state);
>   		pci_slot_set_state(slot, PCI_SLOT_STATE_NORMAL);
> -		return OPAL_HARDWARE;
> +		ret = OPAL_HARDWARE;
>   	}
>   
> +	/* Notify about the pci slot state machine completion */
> +	if (ret <= 0 && slot->ops.completed_sm_run)
> +		slot->ops.completed_sm_run(slot, ret);
> +
>   	return ret;
>   }
>   
> diff --git a/include/pci-slot.h b/include/pci-slot.h
> index cd757535..708374b6 100644
> --- a/include/pci-slot.h
> +++ b/include/pci-slot.h
> @@ -110,6 +110,7 @@ struct pci_slot_ops {
>   	int64_t (*freset)(struct pci_slot *slot);
>   	int64_t (*hreset)(struct pci_slot *slot);
>   	int64_t (*run_sm)(struct pci_slot *slot);
> +	int64_t (*completed_sm_run)(struct pci_slot *slot, uint64_t err);
>   
>   	/* Auxillary functions */
>   	void (*add_properties)(struct pci_slot *slot, struct dt_node *np);
> 

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com  IBM Australia Limited