Subject: Re: [PATCH v4 16/21] powerpc/pci: Create eeh_dev while creating pci_dn

From: Alexey Kardashevskiy <[email-masked]>
Date: Sun, 10 May 2015 01:08:28 +1000

On 05/01/2015 04:03 PM, Gavin Shan wrote:
> The eeh_dev is always created based on pci_dn, but with initcall
> supported by core_initcall_sync(). The patch creates eeh_dev
> when pci_dn is created, indicating they have same life cycle.
>
> Signed-off-by: Gavin Shan <[email-masked]>
> ---
>   arch/powerpc/include/asm/eeh.h         |  6 ++++--
>   arch/powerpc/kernel/eeh_dev.c          | 18 ++++--------------
>   arch/powerpc/kernel/pci_dn.c           | 12 ++++++++++++
>   arch/powerpc/platforms/pseries/setup.c |  6 +-----
>   4 files changed, 21 insertions(+), 21 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
> index 2793d24..4ed88f6 100644
> --- a/arch/powerpc/include/asm/eeh.h
> +++ b/arch/powerpc/include/asm/eeh.h
> @@ -269,7 +269,8 @@ void eeh_pe_restore_bars(struct eeh_pe *pe);
>   const char *eeh_pe_loc_get(struct eeh_pe *pe);
>   struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe);
>
> -void *eeh_dev_init(struct pci_dn *pdn, void *data);
> +struct eeh_dev *eeh_dev_init(struct pci_dn *pdn,
> +			     struct pci_controller *phb);

Everywhere else (?) you name these pci_controller pointer variables "hose" 
but not in this patch.

>   void eeh_dev_phb_init_dynamic(struct pci_controller *phb);
>   int eeh_init(void);
>   int __init eeh_ops_register(struct eeh_ops *ops);
> @@ -322,7 +323,8 @@ static inline int eeh_init(void)
>   	return 0;
>   }
>
> -static inline void *eeh_dev_init(struct pci_dn *pdn, void *data)
> +static inline struct eeh_dev *eeh_dev_init(struct pci_dn *pdn,
> +					   struct pci_controller *phb)
>   {
>   	return NULL;
>   }
> diff --git a/arch/powerpc/kernel/eeh_dev.c b/arch/powerpc/kernel/eeh_dev.c
> index f33ce5b..7486932 100644
> --- a/arch/powerpc/kernel/eeh_dev.c
> +++ b/arch/powerpc/kernel/eeh_dev.c
> @@ -44,14 +44,14 @@
>   /**
>    * eeh_dev_init - Create EEH device according to OF node
>    * @pdn: PCI device node
> - * @data: PHB
> + * @phb: PCI controller
>    *
>    * It will create EEH device according to the given OF node. The function
>    * might be called by PCI emunation, DR, PHB hotplug.
>    */
> -void *eeh_dev_init(struct pci_dn *pdn, void *data)
> +struct eeh_dev *eeh_dev_init(struct pci_dn *pdn,
> +			     struct pci_controller *phb)
>   {
> -	struct pci_controller *phb = data;
>   	struct eeh_dev *edev;
>
>   	/* Allocate EEH device */
> @@ -68,7 +68,7 @@ void *eeh_dev_init(struct pci_dn *pdn, void *data)
>   	edev->phb = phb;
>   	INIT_LIST_HEAD(&edev->list);
>
> -	return NULL;
> +	return edev;
>   }
>
>   /**
> @@ -80,16 +80,8 @@ void *eeh_dev_init(struct pci_dn *pdn, void *data)
>    */
>   void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
>   {
> -	struct pci_dn *root = phb->pci_data;
> -
>   	/* EEH PE for PHB */
>   	eeh_phb_pe_create(phb);
> -
> -	/* EEH device for PHB */
> -	eeh_dev_init(root, phb);
> -
> -	/* EEH devices for children OF nodes */
> -	traverse_pci_dn(root, eeh_dev_init, phb);
>   }
>
>   /**
> @@ -105,8 +97,6 @@ static int __init eeh_dev_phb_init(void)
>   	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
>   		eeh_dev_phb_init_dynamic(phb);
>
> -	pr_info("EEH: devices created\n");
> -
>   	return 0;
>   }
>
> diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
> index d3833af..abc81fa 100644
> --- a/arch/powerpc/kernel/pci_dn.c
> +++ b/arch/powerpc/kernel/pci_dn.c
> @@ -276,6 +276,9 @@ void *update_dn_pci_info(struct device_node *dn, void *data)
>   	const __be32 *regs;
>   	struct device_node *parent;
>   	struct pci_dn *pdn;
> +#ifdef CONFIG_EEH
> +	struct eeh_dev *edev;
> +#endif
>
>   	pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
>   	if (pdn == NULL)
> @@ -306,6 +309,15 @@ void *update_dn_pci_info(struct device_node *dn, void *data)
>   	/* Extended config space */
>   	pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
>
> +	/* Initialize EEH device */
> +#ifdef CONFIG_EEH

You do not need this #ifdef - you have a stub for eeh_dev_init() in 
arch/powerpc/include/asm/eeh.h

> +	edev = eeh_dev_init(pdn, phb);
> +	if (!edev) {

s/!edev/eeh_dev_init(pdn, phb)/ and get rid of @edev local variable at all 
- you do not use it anyway?

> +		kfree(pdn);
> +		return NULL;
> +	}
> +#endif
> +
>   	/* Attach to parent node */
>   	INIT_LIST_HEAD(&pdn->child_list);
>   	INIT_LIST_HEAD(&pdn->list);
> diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
> index 5f80758..92974aa 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -261,12 +261,8 @@ static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long act
>   	switch (action) {
>   	case OF_RECONFIG_ATTACH_NODE:
>   		pci = np->parent->data;
> -		if (pci) {
> +		if (pci)
>   			update_dn_pci_info(np, pci->phb);
> -
> -			/* Create EEH device for the OF node */
> -			eeh_dev_init(PCI_DN(np), pci->phb);
> -		}
>   		break;
>   	default:
>   		err = NOTIFY_DONE;
>

-- 
Alexey