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Date: Wed, 05 Aug 2020 10:48:46 -0700
From: "Sean V Kelley" <sean.v.kelley@...el.com>
To: "Jonathan Cameron" <Jonathan.Cameron@...wei.com>
Cc: bhelgaas@...gle.com, rjw@...ysocki.net, ashok.raj@...el.com,
tony.luck@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
"Qiuxu Zhuo" <qiuxu.zhuo@...el.com>
Subject: Re: [PATCH V2 6/9] PCI: Add 'rcec' field to pci_dev for associated
RCiEPs
On 5 Aug 2020, at 10:40, Jonathan Cameron wrote:
> On Tue, 4 Aug 2020 12:40:49 -0700
> Sean V Kelley <sean.v.kelley@...el.com> wrote:
>
>> From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
>>
>> When attempting error recovery for an RCiEP associated with an RCEC
>> device,
>> there needs to be a way to update the Root Error Status, the
>> Uncorrectable
>> Error Status and the Uncorrectable Error Severity of the parent RCEC.
>> So add the 'rcec' field to the pci_dev structure and provide a hook
>> for the
>> Root Port Driver to associate RCiEPs with their respective parent
>> RCEC.
>>
>> Co-developed-by: Sean V Kelley <sean.v.kelley@...el.com>
>> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
>> Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
> Hi,
>
> One question in line.
>
>> ---
>> drivers/pci/pcie/aer.c | 9 +++++----
>> drivers/pci/pcie/err.c | 12 ++++++++++++
>> drivers/pci/pcie/portdrv_pci.c | 15 +++++++++++++++
>> include/linux/pci.h | 3 +++
>> 4 files changed, 35 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
>> index 87283cda3990..f658607e8e00 100644
>> --- a/drivers/pci/pcie/aer.c
>> +++ b/drivers/pci/pcie/aer.c
>> @@ -1358,17 +1358,18 @@ static int aer_probe(struct pcie_device *dev)
>> static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
>> {
>> int aer = dev->aer_cap;
>> + int rc = 0;
>> u32 reg32;
>> - int rc;
>> -
>>
>> /* Disable Root's interrupt in response to error messages */
>> pci_read_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, ®32);
>> reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
>> pci_write_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, reg32);
>>
>> - rc = pci_bus_error_reset(dev);
>> - pci_info(dev, "Root Port link has been reset\n");
>> + if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC) {
>> + rc = pci_bus_error_reset(dev);
>> + pci_info(dev, "Root Port link has been reset\n");
>> + }
>>
>> /* Clear Root Error Status */
>> pci_read_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, ®32);
>> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
>> index 4812aa678eff..43f1c55c76db 100644
>> --- a/drivers/pci/pcie/err.c
>> +++ b/drivers/pci/pcie/err.c
>> @@ -203,6 +203,12 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev
>> *dev,
>> pci_walk_dev_affected(dev, report_frozen_detected, &status);
>> if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) {
>> status = flr_on_rciep(dev);
>> + /*
>> + * The callback only clears the Root Error Status
>> + * of the RCEC (see aer.c).
>> + */
>> + if (pcie_aer_is_native(dev) && dev->rcec)
>> + reset_link(dev->rcec);
>
> I'm not sure about this pcie_aer_is_native check.
> We don't check in the normal EP path. Perhaps we should be checking
> there
> as well?
Looks like we should. Will make adjustments and test.
>
> I can contrive a CPER record that hits the reset_link for the normal
> EP on my qemu
> test setup. Just for fun it causes a synchronous external abort that
> I need
> to track down but not related this patch or indeed reset_link and may
> just reflect
> an impossible to hit path in the e1000e driver.
>
> It needs a very contrived combination of blocks that say the error is
> fatal
> and others that say it isn't so I'm not that worried about that.
Okay, will also test on my end.
Thanks,
Sean
>
>
>> if (status != PCI_ERS_RESULT_RECOVERED) {
>> pci_warn(dev, "function level reset failed\n");
>> goto failed;
>> @@ -247,7 +253,13 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev
>> *dev,
>> if (pcie_aer_is_native(dev))
>> pcie_clear_device_status(dev);
>> pci_aer_clear_nonfatal_status(dev);
>> + } else if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) {
>> + if (pcie_aer_is_native(dev) && dev->rcec)
>> + pcie_clear_device_status(dev->rcec);
>> + if (dev->rcec)
>> + pci_aer_clear_nonfatal_status(dev->rcec);
>> }
>> +
>> pci_info(dev, "device recovery successful\n");
>> return status;
>>
>> diff --git a/drivers/pci/pcie/portdrv_pci.c
>> b/drivers/pci/pcie/portdrv_pci.c
>> index 4d880679b9b1..dff5c9e13412 100644
>> --- a/drivers/pci/pcie/portdrv_pci.c
>> +++ b/drivers/pci/pcie/portdrv_pci.c
>> @@ -90,6 +90,18 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops
>> = {
>> #define PCIE_PORTDRV_PM_OPS NULL
>> #endif /* !PM */
>>
>> +static int pcie_hook_rcec(struct pci_dev *pdev, void *data)
>> +{
>> + struct pci_dev *rcec = (struct pci_dev *)data;
>> +
>> + pdev->rcec = rcec;
>> + pci_dbg(rcec, "RCiEP(under an RCEC) %04x:%02x:%02x.%d\n",
>> + pci_domain_nr(pdev->bus), pdev->bus->number,
>> + PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
>> +
>> + return 0;
>> +}
>> +
>> /*
>> * pcie_portdrv_probe - Probe PCI-Express port devices
>> * @dev: PCI-Express port device being probed
>> @@ -110,6 +122,9 @@ static int pcie_portdrv_probe(struct pci_dev
>> *dev,
>> (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC)))
>> return -ENODEV;
>>
>> + if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC)
>> + pcie_walk_rcec(dev, pcie_hook_rcec, dev);
>> +
>> status = pcie_port_device_register(dev);
>> if (status)
>> return status;
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index ee49469bd2b5..d5f7dbbf5e2f 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -326,6 +326,9 @@ struct pci_dev {
>> #ifdef CONFIG_PCIEAER
>> u16 aer_cap; /* AER capability offset */
>> struct aer_stats *aer_stats; /* AER stats for this device */
>> +#endif
>> +#ifdef CONFIG_PCIEPORTBUS
>> + struct pci_dev *rcec; /* Associated RCEC device */
>> #endif
>> u8 pcie_cap; /* PCIe capability offset */
>> u8 msi_cap; /* MSI capability offset */
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