| Message ID | 20220117080348.2757180-2-sr@denx.de (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | Fully enable AER | expand |
On Monday 17 January 2022 09:03:47 Stefan Roese wrote: > Testing has shown, that AER reporting is currently disabled in the > DevCtl registers of all non Root Port PCIe devices on systems using > pcie_ports_native || host->native_aer. Practically disabling AER > completely in such systems. This is due to the fact that with commit > 2bd50dd800b5 ("PCI: PCIe: Disable PCIe port services during port > initialization"), a call to pci_disable_pcie_error_reporting() was > added *after* the PCIe AER setup was completed for the PCIe device > tree. > > Here a longer analysis about the currect status of AER enaling / > disabling upon bootup provided by Bjorn: > > pcie_portdrv_probe > pcie_port_device_register > get_port_device_capability > pci_disable_pcie_error_reporting > clear CERE NFERE FERE URRE # <-- disable for RP USP DSP > pcie_device_init > device_register # new AER service device > aer_probe > aer_enable_rootport # RP only > set_downstream_devices_error_reporting > set_device_error_reporting # self (RP) > if (RP || USP || DSP) > pci_enable_pcie_error_reporting > set CERE NFERE FERE URRE # <-- enable for RP > pci_walk_bus > set_device_error_reporting > if (RP || USP || DSP) > pci_enable_pcie_error_reporting > set CERE NFERE FERE URRE # <-- enable for USP DSP > > In a typical Root Port -> Endpoint hierarchy, the above: > - Disables Error Reporting for the Root Port, > - Enables Error Reporting for the Root Port, > - Does NOT enable Error Reporting for the Endpoint because it is not > a Root Port or Switch Port. > > In a deeper Root Port -> Upstream Switch Port -> Downstream Switch > Port -> Endpoint hierarchy: > - Disables Error Reporting for the Root Port, > - Enables Error Reporting for the Root Port, > - Enables Error Reporting for both Switch Ports, > - Does NOT enable Error Reporting for the Endpoint because it is not > a Root Port or Switch Port, > - Disables Error Reporting for the Switch Ports when > pcie_portdrv_probe() claims them. AER does not re-enable it > because these are not Root Ports. > > This patch now removes this call to pci_disable_pcie_error_reporting() > from get_port_device_capability(), leaving the already enabled AER > configuration intact. With this change, AER is enabled in the Root Port > and the PCIe switch upstream and downstream ports. Only the PCIe > Endpoints don't have AER enabled yet. A follow-up patch will take > care of this Endpoint enabling. > > Fixes: 2bd50dd800b5 ("PCI: PCIe: Disable PCIe port services during port initialization") > Signed-off-by: Stefan Roese <sr@denx.de> > Cc: Rafael J. Wysocki <rjw@rjwysocki.net> > Cc: Bjorn Helgaas <helgaas@kernel.org> > Cc: Pali Rohár <pali@kernel.org> > Cc: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com> > Cc: Michal Simek <michal.simek@xilinx.com> > Cc: Yao Hongbo <yaohongbo@linux.alibaba.com> > Cc: Naveen Naidu <naveennaidu479@gmail.com> Reviewed-by: Pali Rohár <pali@kernel.org> > --- > v2: > - Enhance commit message as suggested by Bjorn > > drivers/pci/pcie/portdrv_core.c | 9 +-------- > 1 file changed, 1 insertion(+), 8 deletions(-) > > diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c > index f81c7be4d7d8..27b990cedb4c 100644 > --- a/drivers/pci/pcie/portdrv_core.c > +++ b/drivers/pci/pcie/portdrv_core.c > @@ -244,15 +244,8 @@ static int get_port_device_capability(struct pci_dev *dev) > > #ifdef CONFIG_PCIEAER > if (dev->aer_cap && pci_aer_available() && > - (pcie_ports_native || host->native_aer)) { > + (pcie_ports_native || host->native_aer)) > services |= PCIE_PORT_SERVICE_AER; > - > - /* > - * Disable AER on this port in case it's been enabled by the > - * BIOS (the AER service driver will enable it when necessary). > - */ > - pci_disable_pcie_error_reporting(dev); > - } > #endif > > /* Root Ports and Root Complex Event Collectors may generate PMEs */ > -- > 2.34.1 >
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index f81c7be4d7d8..27b990cedb4c 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -244,15 +244,8 @@ static int get_port_device_capability(struct pci_dev *dev) #ifdef CONFIG_PCIEAER if (dev->aer_cap && pci_aer_available() && - (pcie_ports_native || host->native_aer)) { + (pcie_ports_native || host->native_aer)) services |= PCIE_PORT_SERVICE_AER; - - /* - * Disable AER on this port in case it's been enabled by the - * BIOS (the AER service driver will enable it when necessary). - */ - pci_disable_pcie_error_reporting(dev); - } #endif /* Root Ports and Root Complex Event Collectors may generate PMEs */
Testing has shown, that AER reporting is currently disabled in the DevCtl registers of all non Root Port PCIe devices on systems using pcie_ports_native || host->native_aer. Practically disabling AER completely in such systems. This is due to the fact that with commit 2bd50dd800b5 ("PCI: PCIe: Disable PCIe port services during port initialization"), a call to pci_disable_pcie_error_reporting() was added *after* the PCIe AER setup was completed for the PCIe device tree. Here a longer analysis about the currect status of AER enaling / disabling upon bootup provided by Bjorn: pcie_portdrv_probe pcie_port_device_register get_port_device_capability pci_disable_pcie_error_reporting clear CERE NFERE FERE URRE # <-- disable for RP USP DSP pcie_device_init device_register # new AER service device aer_probe aer_enable_rootport # RP only set_downstream_devices_error_reporting set_device_error_reporting # self (RP) if (RP || USP || DSP) pci_enable_pcie_error_reporting set CERE NFERE FERE URRE # <-- enable for RP pci_walk_bus set_device_error_reporting if (RP || USP || DSP) pci_enable_pcie_error_reporting set CERE NFERE FERE URRE # <-- enable for USP DSP In a typical Root Port -> Endpoint hierarchy, the above: - Disables Error Reporting for the Root Port, - Enables Error Reporting for the Root Port, - Does NOT enable Error Reporting for the Endpoint because it is not a Root Port or Switch Port. In a deeper Root Port -> Upstream Switch Port -> Downstream Switch Port -> Endpoint hierarchy: - Disables Error Reporting for the Root Port, - Enables Error Reporting for the Root Port, - Enables Error Reporting for both Switch Ports, - Does NOT enable Error Reporting for the Endpoint because it is not a Root Port or Switch Port, - Disables Error Reporting for the Switch Ports when pcie_portdrv_probe() claims them. AER does not re-enable it because these are not Root Ports. This patch now removes this call to pci_disable_pcie_error_reporting() from get_port_device_capability(), leaving the already enabled AER configuration intact. With this change, AER is enabled in the Root Port and the PCIe switch upstream and downstream ports. Only the PCIe Endpoints don't have AER enabled yet. A follow-up patch will take care of this Endpoint enabling. Fixes: 2bd50dd800b5 ("PCI: PCIe: Disable PCIe port services during port initialization") Signed-off-by: Stefan Roese <sr@denx.de> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Bjorn Helgaas <helgaas@kernel.org> Cc: Pali Rohár <pali@kernel.org> Cc: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Yao Hongbo <yaohongbo@linux.alibaba.com> Cc: Naveen Naidu <naveennaidu479@gmail.com> --- v2: - Enhance commit message as suggested by Bjorn drivers/pci/pcie/portdrv_core.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)