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Date: Thu, 22 Mar 2012 16:35:15 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Gavin Shan <shangw@...ux.vnet.ibm.com>
Cc: sfr@...b.auug.org.au, grant.likely@...retlab.ca,
linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
paulus@...ba.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] EEH: remove eeh device from OF node
On Thu, 2012-03-22 at 11:28 +0800, Gavin Shan wrote:
> > 1- ASAP so we can still get that into 3.4, move the eeh_dev pointer to
> >struct pci_dn instead of struct device_node. This structure is
> >accessible directly via dn->data and is ppc specific, that will be a
> >better temporary solution and and adding stuff to the generic struct
> >device_node.
> >
>
> I've sent patch again it and please take a look when you have time.
All I see is your patch that does the lookup, I missed the patch to move
it to pci_dn, can you re-send that to me directly ?
Thanks !
Cheers,
Ben.
> > 2- Then, what we need to do is generalize the use of eeh_dev rather
> >than device_node as the main object being worked on in the eeh layer and
> >thus as the argument to most functions.
> >
> >Cheers,
> >Ben.
> >
>
> Thanks,
> Gavin
>
> >> Signed-off-by: Gavin Shan <shangw@...ux.vnet.ibm.com>
> >> ---
> >> arch/powerpc/include/asm/eeh.h | 7 +++++++
> >> arch/powerpc/platforms/pseries/eeh_dev.c | 29 ++++++++++++++++++++++++++++-
> >> include/linux/of.h | 10 ----------
> >> 3 files changed, 35 insertions(+), 11 deletions(-)
> >>
> >> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
> >> index d60f998..591e0a1 100644
> >> --- a/arch/powerpc/include/asm/eeh.h
> >> +++ b/arch/powerpc/include/asm/eeh.h
> >> @@ -56,6 +56,7 @@ struct eeh_dev {
> >> struct pci_controller *phb; /* Associated PHB */
> >> struct device_node *dn; /* Associated device node */
> >> struct pci_dev *pdev; /* Associated PCI device */
> >> + struct list_head list; /* Form the global link list */
> >> };
> >>
> >> static inline struct device_node *eeh_dev_to_of_node(struct eeh_dev *edev)
> >> @@ -115,6 +116,7 @@ extern int eeh_subsystem_enabled;
> >> */
> >> #define EEH_MAX_ALLOWED_FREEZES 5
> >>
> >> +struct eeh_dev *eeh_dev_from_of_node(struct device_node *dn);
> >> void * __devinit eeh_dev_init(struct device_node *dn, void *data);
> >> void __devinit eeh_dev_phb_init_dynamic(struct pci_controller *phb);
> >> void __init eeh_dev_phb_init(void);
> >> @@ -132,6 +134,11 @@ void eeh_add_device_tree_early(struct device_node *);
> >> void eeh_add_device_tree_late(struct pci_bus *);
> >> void eeh_remove_bus_device(struct pci_dev *);
> >>
> >> +static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
> >> +{
> >> + return eeh_dev_from_of_node(dn);
> >> +}
> >> +
> >> /**
> >> * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
> >> *
> >> diff --git a/arch/powerpc/platforms/pseries/eeh_dev.c b/arch/powerpc/platforms/pseries/eeh_dev.c
> >> index f3aed7d..925d3a3 100644
> >> --- a/arch/powerpc/platforms/pseries/eeh_dev.c
> >> +++ b/arch/powerpc/platforms/pseries/eeh_dev.c
> >> @@ -34,6 +34,7 @@
> >> #include <linux/export.h>
> >> #include <linux/gfp.h>
> >> #include <linux/init.h>
> >> +#include <linux/list.h>
> >> #include <linux/kernel.h>
> >> #include <linux/pci.h>
> >> #include <linux/string.h>
> >> @@ -41,6 +42,30 @@
> >> #include <asm/pci-bridge.h>
> >> #include <asm/ppc-pci.h>
> >>
> >> +/* eeh device list */
> >> +static LIST_HEAD(eeh_dev_list);
> >> +
> >> +/**
> >> + * eeh_dev_from_of_node - Retrieve EEH device according to OF node
> >> + * @dn: OF node
> >> + *
> >> + * All existing eeh devices have been put into the global list.
> >> + * In addition, the eeh device is tracing the corresponding
> >> + * OF node. The function is used to retrieve the corresponding
> >> + * eeh device according to the given OF node.
> >> + */
> >> +struct eeh_dev *eeh_dev_from_of_node(struct device_node *dn)
> >> +{
> >> + struct eeh_dev *edev = NULL;
> >> +
> >> + list_for_each_entry(edev, &eeh_dev_list, list) {
> >> + if (edev->dn && edev->dn == dn)
> >> + return edev;
> >> + }
> >> +
> >> + return NULL;
> >> +}
> >> +
> >> /**
> >> * eeh_dev_init - Create EEH device according to OF node
> >> * @dn: device node
> >> @@ -62,10 +87,12 @@ void * __devinit eeh_dev_init(struct device_node *dn, void *data)
> >> }
> >>
> >> /* Associate EEH device with OF node */
> >> - dn->edev = edev;
> >> edev->dn = dn;
> >> edev->phb = phb;
> >>
> >> + /* Add to global list */
> >> + list_add_tail(&edev->list, &eeh_dev_list);
> >> +
> >> return NULL;
> >> }
> >>
> >> diff --git a/include/linux/of.h b/include/linux/of.h
> >> index 3e710d8..a75a831 100644
> >> --- a/include/linux/of.h
> >> +++ b/include/linux/of.h
> >> @@ -58,9 +58,6 @@ struct device_node {
> >> struct kref kref;
> >> unsigned long _flags;
> >> void *data;
> >> -#if defined(CONFIG_EEH)
> >> - struct eeh_dev *edev;
> >> -#endif
> >> #if defined(CONFIG_SPARC)
> >> char *path_component_name;
> >> unsigned int unique_id;
> >> @@ -75,13 +72,6 @@ struct of_phandle_args {
> >> uint32_t args[MAX_PHANDLE_ARGS];
> >> };
> >>
> >> -#if defined(CONFIG_EEH)
> >> -static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
> >> -{
> >> - return dn->edev;
> >> -}
> >> -#endif
> >> -
> >> #if defined(CONFIG_SPARC) || !defined(CONFIG_OF)
> >> /* Dummy ref counting routines - to be implemented later */
> >> static inline struct device_node *of_node_get(struct device_node *node)
> >
> >
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