| Message ID | 1347453225-7704-2-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, 2012-09-12 at 20:33 +0800, Yijing Wang wrote: > Since hot plug for pci devices while doing aer inject, some newly created child buses' > pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not > list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > --- > drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ > 1 files changed, 32 insertions(+), 0 deletions(-) > > diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c > index 0816483..9d195ae 100644 > --- a/drivers/pci/pcie/aer/aer_inject.c > +++ b/drivers/pci/pcie/aer/aer_inject.c > @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, > bus_ops->ops = ops; > } > > +static void pci_clean_child_aer_ops(struct pci_bus *bus) > +{ > + struct pci_bus *child; > + > + list_for_each_entry(child, &bus->children, node) { > + if (child->ops == &pci_ops_aer) > + pci_bus_set_ops(child, bus->ops); > + pci_clean_child_aer_ops(child); > + } > +} > + > +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. > + * pci_ops of root bus won't be pci_ops_aer here*/ Why scan all pci buses? Is it possible just to check buses in pci_bus_ops_list. Best Regards, Huang Ying > +static void clean_untracked_pci_ops_aer(void) > +{ > + struct pci_bus *bus = NULL; > + > + while ((bus = pci_find_next_bus(bus)) != NULL) > + pci_clean_child_aer_ops(bus); > +} > + > + > static int pci_bus_set_aer_ops(struct pci_bus *bus) > { > struct pci_ops *ops; > @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) > pci_bus_set_ops(bus_ops->bus, bus_ops->ops); > kfree(bus_ops); > } > + > + clean_untracked_pci_aer_ops(); > > spin_lock_irqsave(&inject_lock, flags); > list_for_each_entry_safe(err, err_next, &einjected, list) { > @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) > kfree(err); > } > spin_unlock_irqrestore(&inject_lock, flags); > + > + /* Inject aer errors and hotplug the same pcie device > + * maybe assign some newly created buses' pci_ops pci_ops_aer. > + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, > + * we need to find and clean untracked pci_ops_aer before aer_inject > + * module exit > + */ > + clean_untracked_pci_ops_aer(); > } > > module_init(aer_inject_init); -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2012/9/13 9:43, Huang Ying wrote: > On Wed, 2012-09-12 at 20:33 +0800, Yijing Wang wrote: >> Since hot plug for pci devices while doing aer inject, some newly created child buses' >> pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not >> list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. >> >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >> --- >> drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ >> 1 files changed, 32 insertions(+), 0 deletions(-) >> >> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c >> index 0816483..9d195ae 100644 >> --- a/drivers/pci/pcie/aer/aer_inject.c >> +++ b/drivers/pci/pcie/aer/aer_inject.c >> @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, >> bus_ops->ops = ops; >> } >> >> +static void pci_clean_child_aer_ops(struct pci_bus *bus) >> +{ >> + struct pci_bus *child; >> + >> + list_for_each_entry(child, &bus->children, node) { >> + if (child->ops == &pci_ops_aer) >> + pci_bus_set_ops(child, bus->ops); >> + pci_clean_child_aer_ops(child); >> + } >> +} >> + >> +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. >> + * pci_ops of root bus won't be pci_ops_aer here*/ > > Why scan all pci buses? Is it possible just to check buses in > pci_bus_ops_list. > Hi Huang Ying, Some buses' pci_ops_aer may be not assigned by pci_bus_set_aer_ops() function, As the first patch [PATCH v2 1/4] said. Some newly created buses' pci_ops assigned to pci_ops_aer because their parent just doing aer inject, parent bus's pci_ops was pci_ops_aer. So when we rmmod aer_inject module, these buses' pci_ops_aer will be invalid. 1?Tracked pci_ops_aer will be cleaned and pci_ops will reassign to their original pci_ops saved in pci_bus_ops_list. 2?Un-tracked pci_ops_aer won't be cleaned.so we need to fix it. > Best Regards, > Huang Ying > >> +static void clean_untracked_pci_ops_aer(void) >> +{ >> + struct pci_bus *bus = NULL; >> + >> + while ((bus = pci_find_next_bus(bus)) != NULL) >> + pci_clean_child_aer_ops(bus); >> +} >> + >> + >> static int pci_bus_set_aer_ops(struct pci_bus *bus) >> { >> struct pci_ops *ops; >> @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) >> pci_bus_set_ops(bus_ops->bus, bus_ops->ops); >> kfree(bus_ops); >> } >> + >> + clean_untracked_pci_aer_ops(); >> >> spin_lock_irqsave(&inject_lock, flags); >> list_for_each_entry_safe(err, err_next, &einjected, list) { >> @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) >> kfree(err); >> } >> spin_unlock_irqrestore(&inject_lock, flags); >> + >> + /* Inject aer errors and hotplug the same pcie device >> + * maybe assign some newly created buses' pci_ops pci_ops_aer. >> + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, >> + * we need to find and clean untracked pci_ops_aer before aer_inject >> + * module exit >> + */ >> + clean_untracked_pci_ops_aer(); >> } >> >> module_init(aer_inject_init); > > > > . >
On Thu, 2012-09-13 at 18:54 +0800, Yijing Wang wrote: > On 2012/9/13 9:43, Huang Ying wrote: > > On Wed, 2012-09-12 at 20:33 +0800, Yijing Wang wrote: > >> Since hot plug for pci devices while doing aer inject, some newly created child buses' > >> pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not > >> list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. > >> > >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> > >> --- > >> drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ > >> 1 files changed, 32 insertions(+), 0 deletions(-) > >> > >> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c > >> index 0816483..9d195ae 100644 > >> --- a/drivers/pci/pcie/aer/aer_inject.c > >> +++ b/drivers/pci/pcie/aer/aer_inject.c > >> @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, > >> bus_ops->ops = ops; > >> } > >> > >> +static void pci_clean_child_aer_ops(struct pci_bus *bus) > >> +{ > >> + struct pci_bus *child; > >> + > >> + list_for_each_entry(child, &bus->children, node) { > >> + if (child->ops == &pci_ops_aer) > >> + pci_bus_set_ops(child, bus->ops); > >> + pci_clean_child_aer_ops(child); > >> + } > >> +} > >> + > >> +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. > >> + * pci_ops of root bus won't be pci_ops_aer here*/ > > > > Why scan all pci buses? Is it possible just to check buses in > > pci_bus_ops_list. > > > > Hi Huang Ying, > Some buses' pci_ops_aer may be not assigned by pci_bus_set_aer_ops() function, > As the first patch [PATCH v2 1/4] said. Some newly created buses' pci_ops assigned to > pci_ops_aer because their parent just doing aer inject, parent bus's pci_ops was pci_ops_aer. > So when we rmmod aer_inject module, these buses' pci_ops_aer will be invalid. > > 1?Tracked pci_ops_aer will be cleaned and pci_ops will reassign to their original pci_ops saved in pci_bus_ops_list. > 2?Un-tracked pci_ops_aer won't be cleaned.so we need to fix it. Can we just check all bus and its children in pci_bus_ops_list? If my understanding were correct, bus itself or some of its parents should be saved in pci_bus_ops_list? Best Regards, Huang Ying > > > >> +static void clean_untracked_pci_ops_aer(void) > >> +{ > >> + struct pci_bus *bus = NULL; > >> + > >> + while ((bus = pci_find_next_bus(bus)) != NULL) > >> + pci_clean_child_aer_ops(bus); > >> +} > >> + > >> + > >> static int pci_bus_set_aer_ops(struct pci_bus *bus) > >> { > >> struct pci_ops *ops; > >> @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) > >> pci_bus_set_ops(bus_ops->bus, bus_ops->ops); > >> kfree(bus_ops); > >> } > >> + > >> + clean_untracked_pci_aer_ops(); > >> > >> spin_lock_irqsave(&inject_lock, flags); > >> list_for_each_entry_safe(err, err_next, &einjected, list) { > >> @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) > >> kfree(err); > >> } > >> spin_unlock_irqrestore(&inject_lock, flags); > >> + > >> + /* Inject aer errors and hotplug the same pcie device > >> + * maybe assign some newly created buses' pci_ops pci_ops_aer. > >> + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, > >> + * we need to find and clean untracked pci_ops_aer before aer_inject > >> + * module exit > >> + */ > >> + clean_untracked_pci_ops_aer(); > >> } > >> > >> module_init(aer_inject_init); > > > > > > > > . > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2012/9/14 8:56, Huang Ying wrote: > On Thu, 2012-09-13 at 18:54 +0800, Yijing Wang wrote: >> On 2012/9/13 9:43, Huang Ying wrote: >>> On Wed, 2012-09-12 at 20:33 +0800, Yijing Wang wrote: >>>> Since hot plug for pci devices while doing aer inject, some newly created child buses' >>>> pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not >>>> list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. >>>> >>>> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >>>> --- >>>> drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ >>>> 1 files changed, 32 insertions(+), 0 deletions(-) >>>> >>>> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c >>>> index 0816483..9d195ae 100644 >>>> --- a/drivers/pci/pcie/aer/aer_inject.c >>>> +++ b/drivers/pci/pcie/aer/aer_inject.c >>>> @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, >>>> bus_ops->ops = ops; >>>> } >>>> >>>> +static void pci_clean_child_aer_ops(struct pci_bus *bus) >>>> +{ >>>> + struct pci_bus *child; >>>> + >>>> + list_for_each_entry(child, &bus->children, node) { >>>> + if (child->ops == &pci_ops_aer) >>>> + pci_bus_set_ops(child, bus->ops); >>>> + pci_clean_child_aer_ops(child); >>>> + } >>>> +} >>>> + >>>> +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. >>>> + * pci_ops of root bus won't be pci_ops_aer here*/ >>> >>> Why scan all pci buses? Is it possible just to check buses in >>> pci_bus_ops_list. >>> >> >> Hi Huang Ying, >> Some buses' pci_ops_aer may be not assigned by pci_bus_set_aer_ops() function, >> As the first patch [PATCH v2 1/4] said. Some newly created buses' pci_ops assigned to >> pci_ops_aer because their parent just doing aer inject, parent bus's pci_ops was pci_ops_aer. >> So when we rmmod aer_inject module, these buses' pci_ops_aer will be invalid. >> >> 1?Tracked pci_ops_aer will be cleaned and pci_ops will reassign to their original pci_ops saved in pci_bus_ops_list. >> 2?Un-tracked pci_ops_aer won't be cleaned.so we need to fix it. > > Can we just check all bus and its children in pci_bus_ops_list? If my > understanding were correct, bus itself or some of its parents should be > saved in pci_bus_ops_list? > Yes, good idea! I think the buses that owned untracked pci_ops_aer always are child buses of the root buses tracked in the pci_bus_ops_list. I will improve this patch in this way. Thanks Yijing > Best Regards, > Huang Ying > >>> >>>> +static void clean_untracked_pci_ops_aer(void) >>>> +{ >>>> + struct pci_bus *bus = NULL; >>>> + >>>> + while ((bus = pci_find_next_bus(bus)) != NULL) >>>> + pci_clean_child_aer_ops(bus); >>>> +} >>>> + >>>> + >>>> static int pci_bus_set_aer_ops(struct pci_bus *bus) >>>> { >>>> struct pci_ops *ops; >>>> @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) >>>> pci_bus_set_ops(bus_ops->bus, bus_ops->ops); >>>> kfree(bus_ops); >>>> } >>>> + >>>> + clean_untracked_pci_aer_ops(); >>>> >>>> spin_lock_irqsave(&inject_lock, flags); >>>> list_for_each_entry_safe(err, err_next, &einjected, list) { >>>> @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) >>>> kfree(err); >>>> } >>>> spin_unlock_irqrestore(&inject_lock, flags); >>>> + >>>> + /* Inject aer errors and hotplug the same pcie device >>>> + * maybe assign some newly created buses' pci_ops pci_ops_aer. >>>> + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, >>>> + * we need to find and clean untracked pci_ops_aer before aer_inject >>>> + * module exit >>>> + */ >>>> + clean_untracked_pci_ops_aer(); >>>> } >>>> >>>> module_init(aer_inject_init); >>> >>> >>> >>> . >>> >> >> > > > > . >
diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c index 0816483..9d195ae 100644 --- a/drivers/pci/pcie/aer/aer_inject.c +++ b/drivers/pci/pcie/aer/aer_inject.c @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, bus_ops->ops = ops; } +static void pci_clean_child_aer_ops(struct pci_bus *bus) +{ + struct pci_bus *child; + + list_for_each_entry(child, &bus->children, node) { + if (child->ops == &pci_ops_aer) + pci_bus_set_ops(child, bus->ops); + pci_clean_child_aer_ops(child); + } +} + +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. + * pci_ops of root bus won't be pci_ops_aer here*/ +static void clean_untracked_pci_ops_aer(void) +{ + struct pci_bus *bus = NULL; + + while ((bus = pci_find_next_bus(bus)) != NULL) + pci_clean_child_aer_ops(bus); +} + + static int pci_bus_set_aer_ops(struct pci_bus *bus) { struct pci_ops *ops; @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) pci_bus_set_ops(bus_ops->bus, bus_ops->ops); kfree(bus_ops); } + + clean_untracked_pci_aer_ops(); spin_lock_irqsave(&inject_lock, flags); list_for_each_entry_safe(err, err_next, &einjected, list) { @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) kfree(err); } spin_unlock_irqrestore(&inject_lock, flags); + + /* Inject aer errors and hotplug the same pcie device + * maybe assign some newly created buses' pci_ops pci_ops_aer. + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, + * we need to find and clean untracked pci_ops_aer before aer_inject + * module exit + */ + clean_untracked_pci_ops_aer(); } module_init(aer_inject_init);
Since hot plug for pci devices while doing aer inject, some newly created child buses' pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. Signed-off-by: Yijing Wang <wangyijing@huawei.com> --- drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-)