Re: [External] Re: [PATCH 1/3] PCI/AER: Use pci_aer_clear_uncorrect_error_status() to clear uncorrectable error status

From: Bjorn Helgaas
Date: Thu Sep 22 2022 - 16:02:42 EST

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On Mon, Sep 12, 2022 at 01:09:05AM +0800, Zhuo Chen wrote:
> On 9/12/22 12:22 AM, Serge Semin wrote:
> > On Fri, Sep 02, 2022 at 02:16:32AM +0800, Zhuo Chen wrote:
> > > Status bits for ERR_NONFATAL errors only are cleared in
> > > pci_aer_clear_nonfatal_status(), but we want clear uncorrectable
> > > error status in ntb_hw_idt.c and lpfc_attr.c. So we add
> > > pci_aer_clear_uncorrect_error_status() and change to use it.
> >
> > What about the next drivers
> >
> > drivers/scsi/lpfc/lpfc_attr.c
> > drivers/crypto/hisilicon/qm.c
> > drivers/net/ethernet/intel/ice/ice_main.c
> >
> > which call the pci_aer_clear_nonfatal_status() method too?
>
> ‘pci_aer_clear_nonfatal_status()’ in
> drivers/net/ethernet/intel/ice/ice_main.c has already been removed and
> merged in kernel in: https://github.com/torvalds/linux/commit/ca415ea1f03abf34fc8e4cc5fc30a00189b4e776

It's better if you can use kernel.org URLs that don't depend on
third parties like github, e.g.,

https://git.kernel.org/linus/ca415ea1f03a

> ‘pci_aer_clear_nonfatal_status()’ in drivers/crypto/hisilicon/qm.c will be
> removed in the next kernel:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/crypto/hisilicon/qm.c?id=00278564a60e11df8bcca0ececd8b2f55434e406

This is a problem because 00278564a60e ("crypto: hisilicon - Remove
pci_aer_clear_nonfatal_status() call") is in Herbert's cryptodev tree,
and if I apply this series to the PCI tree and Linus merges it before
Herbert's cryptodev changes, it will break the build.

I think we need to split this patch up like this:

- Add pci_aer_clear_uncorrect_error_status() to PCI core
- Convert dpc to use pci_aer_clear_uncorrect_error_status()
(I might end up squashing with above)
- Convert lpfc to use pci_aer_clear_uncorrect_error_status()
- Convert ntb_hw_idt to use pci_aer_clear_uncorrect_error_status()
- Unexport pci_aer_clear_nonfatal_status()

Then I can apply all but the last patch safely. If the crypto changes
are merged first, we can add the last one; otherwise we can do it for
the next cycle.

> Uncorrectable error status register was intended to be cleared in
> drivers/scsi/lpfc/lpfc_attr.c. But originally function was changed in https://github.com/torvalds/linux/commit/e7b0b847de6db161e3917732276e425bc92a2feb
> and
> https://github.com/torvalds/linux/commit/894020fdd88c1e9a74c60b67c0f19f1c7696ba2f

This will be a behavior change for lpfc and ntb_hw_idt. It looks like
it changes the behavior back to what it was before e7b0b847de6d
("PCI/AER: Clear only ERR_NONFATAL bits during non-fatal recovery"),
so it might be OK, but splitting these out to their own patches will
make the change more obvious and we can make sure that's what we want.

Bjorn

> > > Use pci_aer_clear_nonfatal_status() in dpc_process_error(), which has
> > > no functional changes.
> > >
> > > Since pci_aer_clear_nonfatal_status() is used only internally, move
> > > its declaration to the PCI internal header file. Also, no one cares
> > > about return value of pci_aer_clear_nonfatal_status(), so make it void.
> > >
> > > Signed-off-by: Zhuo Chen <chenzhuo.1@xxxxxxxxxxxxx>
> > > ---
> > > drivers/ntb/hw/idt/ntb_hw_idt.c | 4 ++--
> > > drivers/pci/pci.h | 2 ++
> > > drivers/pci/pcie/aer.c | 23 ++++++++++++++++++-----
> > > drivers/pci/pcie/dpc.c | 3 +--
> > > drivers/scsi/lpfc/lpfc_attr.c | 4 ++--
> > > include/linux/aer.h | 4 ++--
> > > 6 files changed, 27 insertions(+), 13 deletions(-)
> > >
> > > diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
> > > index 733557231ed0..de1dbbc5b9de 100644
> > > --- a/drivers/ntb/hw/idt/ntb_hw_idt.c
> > > +++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
> > > @@ -2657,8 +2657,8 @@ static int idt_init_pci(struct idt_ntb_dev *ndev)
> > > ret = pci_enable_pcie_error_reporting(pdev);
> > > if (ret != 0)
> > > dev_warn(&pdev->dev, "PCIe AER capability disabled\n");
> >
> > > - else /* Cleanup nonfatal error status before getting to init */
> > > - pci_aer_clear_nonfatal_status(pdev);
> > > + else /* Cleanup uncorrectable error status before getting to init */
> > > + pci_aer_clear_uncorrect_error_status(pdev);
> >
> > From the IDT NTB PCIe initialization procedure point of view both of
> > these methods are equivalent. So for the IDT NTB part:
> >
> IDT NTB part is the same as drivers/scsi/lpfc/lpfc_attr.c. The original
> function is clear uncorrectable error status register including fatal and
> non-fatal error status bits.
>
> > Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> >
> > -Sergey
> >
> > > /* First enable the PCI device */
> > > ret = pcim_enable_device(pdev);
> > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> > > index e10cdec6c56e..574176f43025 100644
> > > --- a/drivers/pci/pci.h
> > > +++ b/drivers/pci/pci.h
> > > @@ -686,6 +686,7 @@ void pci_aer_init(struct pci_dev *dev);
> > > void pci_aer_exit(struct pci_dev *dev);
> > > extern const struct attribute_group aer_stats_attr_group;
> > > void pci_aer_clear_fatal_status(struct pci_dev *dev);
> > > +void pci_aer_clear_nonfatal_status(struct pci_dev *dev);
> > > int pci_aer_clear_status(struct pci_dev *dev);
> > > int pci_aer_raw_clear_status(struct pci_dev *dev);
> > > #else
> > > @@ -693,6 +694,7 @@ static inline void pci_no_aer(void) { }
> > > static inline void pci_aer_init(struct pci_dev *d) { }
> > > static inline void pci_aer_exit(struct pci_dev *d) { }
> > > static inline void pci_aer_clear_fatal_status(struct pci_dev *dev) { }
> > > +static inline void pci_aer_clear_nonfatal_status(struct pci_dev *dev) { }
> > > static inline int pci_aer_clear_status(struct pci_dev *dev) { return -EINVAL; }
> > > static inline int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL; }
> > > #endif
> > > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> > > index 7952e5efd6cf..d2996afa80f6 100644
> > > --- a/drivers/pci/pcie/aer.c
> > > +++ b/drivers/pci/pcie/aer.c
> > > @@ -251,13 +251,13 @@ int pci_disable_pcie_error_reporting(struct pci_dev *dev)
> > > }
> > > EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
> > > -int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
> > > +void pci_aer_clear_nonfatal_status(struct pci_dev *dev)
> > > {
> > > int aer = dev->aer_cap;
> > > u32 status, sev;
> > > if (!pcie_aer_is_native(dev))
> > > - return -EIO;
> > > + return;
> > > /* Clear status bits for ERR_NONFATAL errors only */
> > > pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
> > > @@ -265,10 +265,7 @@ int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
> > > status &= ~sev;
> > > if (status)
> > > pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
> > > -
> > > - return 0;
> > > }
> > > -EXPORT_SYMBOL_GPL(pci_aer_clear_nonfatal_status);
> > > void pci_aer_clear_fatal_status(struct pci_dev *dev)
> > > {
> > > @@ -286,6 +283,22 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
> > > pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
> > > }
> > > +int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
> > > +{
> > > + int aer = dev->aer_cap;
> > > + u32 status;
> > > +
> > > + if (!pcie_aer_is_native(dev))
> > > + return -EIO;
> > > +
> > > + pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
> > > + if (status)
> > > + pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
> > > +
> > > + return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(pci_aer_clear_uncorrect_error_status);
> > > +
> > > /**
> > > * pci_aer_raw_clear_status - Clear AER error registers.
> > > * @dev: the PCI device
> > > diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> > > index 3e9afee02e8d..7942073fbb34 100644
> > > --- a/drivers/pci/pcie/dpc.c
> > > +++ b/drivers/pci/pcie/dpc.c
> > > @@ -288,8 +288,7 @@ void dpc_process_error(struct pci_dev *pdev)
> > > dpc_get_aer_uncorrect_severity(pdev, &info) &&
> > > aer_get_device_error_info(pdev, &info)) {
> > > aer_print_error(pdev, &info);
> > > - pci_aer_clear_nonfatal_status(pdev);
> > > - pci_aer_clear_fatal_status(pdev);
> > > + pci_aer_clear_uncorrect_error_status(pdev);
> > > }
> > > }
> > > diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
> > > index 3caaa7c4af48..1ed8d1640325 100644
> > > --- a/drivers/scsi/lpfc/lpfc_attr.c
> > > +++ b/drivers/scsi/lpfc/lpfc_attr.c
> > > @@ -4712,7 +4712,7 @@ static DEVICE_ATTR_RW(lpfc_aer_support);
> > > * Description:
> > > * If the @buf contains 1 and the device currently has the AER support
> > > * enabled, then invokes the kernel AER helper routine
> > > - * pci_aer_clear_nonfatal_status() to clean up the uncorrectable
> > > + * pci_aer_clear_uncorrect_error_status() to clean up the uncorrectable
> > > * error status register.
> > > *
> > > * Notes:
> > > @@ -4738,7 +4738,7 @@ lpfc_aer_cleanup_state(struct device *dev, struct device_attribute *attr,
> > > return -EINVAL;
> > > if (phba->hba_flag & HBA_AER_ENABLED)
> > > - rc = pci_aer_clear_nonfatal_status(phba->pcidev);
> > > + rc = pci_aer_clear_uncorrect_error_status(phba->pcidev);
> > > if (rc == 0)
> > > return strlen(buf);
> > > diff --git a/include/linux/aer.h b/include/linux/aer.h
> > > index 97f64ba1b34a..f638ad955deb 100644
> > > --- a/include/linux/aer.h
> > > +++ b/include/linux/aer.h
> > > @@ -44,7 +44,7 @@ struct aer_capability_regs {
> > > /* PCIe port driver needs this function to enable AER */
> > > int pci_enable_pcie_error_reporting(struct pci_dev *dev);
> > > int pci_disable_pcie_error_reporting(struct pci_dev *dev);
> > > -int pci_aer_clear_nonfatal_status(struct pci_dev *dev);
> > > +int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev);
> > > void pci_save_aer_state(struct pci_dev *dev);
> > > void pci_restore_aer_state(struct pci_dev *dev);
> > > #else
> > > @@ -56,7 +56,7 @@ static inline int pci_disable_pcie_error_reporting(struct pci_dev *dev)
> > > {
> > > return -EINVAL;
> > > }
> > > -static inline int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
> > > +static inline int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
> > > {
> > > return -EINVAL;
> > > }
> > > --
> > > 2.30.1 (Apple Git-130)
> > >
>
> --
> Thanks,
> Zhuo Chen

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