Hi Sathyanarayanan,

On Wed, 2020-04-22 at 15:50 -0700, Kuppuswamy, Sathyanarayanan wrote:

On 4/20/20 2:37 PM, Jon Derrick wrote:

quoted

The existing portdrv model prevents DPC services without either OS
control (_OSC) granted to AER services, a Host Bridge requesting Native
AER, or using one of the 'pcie_ports=' parameters of 'native' or
'dpc-native'.

The DPC port service driver itself will also fail to probe if the kernel
assumes the port is using Firmware-First AER. It's a reasonable
expectation that a port using Firmware-First AER will also be using
Firmware-First DPC, however if a Host Bridge requests Native DPC, the
DPC driver should allow it and not fail to bind due to AER capability
settings.

Host Bridges which request Native DPC port services will also likely
request Native AER, however it shouldn't be a requirement. This patch
allows ports on those Host Bridges to have DPC port services.

This will avoid the unlikely situation where the port is Firmware-First
AER and Native DPC, and a BIOS or switch firmware preconfiguration of
the DPC trigger could result in unhandled DPC events.

Signed-off-by: Jon Derrick <redacted>
---
  drivers/pci/pcie/dpc.c          | 3 ++-
  drivers/pci/pcie/portdrv_core.c | 3 ++-
  2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 7621704..3f3106f 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c

@@ -284,7 +284,8 @@ static int dpc_probe(struct pcie_device *dev)
  	int status;
  	u16 ctl, cap;
  
-	if (pcie_aer_get_firmware_first(pdev) && !pcie_ports_dpc_native)
+	if (pcie_aer_get_firmware_first(pdev) && !pcie_ports_dpc_native &&
+	    !pci_find_host_bridge(pdev->bus)->native_dpc)

Why do it in probe as well ? if host->native_dpc is not set then the
device DPC probe it self won't happen right ?

Portdrv only enables the interrupt and allows the probe to occur.

The probe itself will still fail if there's a mixed-mode _OSC
negotiated AER & DPC, due to pcie_aer_get_firmware_first returning 1
for AER and no check for DPC.

I don't know if such a platform will exist, but the kernel is already
wired for 'dpc-native' so it makes sense to extend it for this..

This transform might be more readable:
	if (pcie_aer_get_firmware_first(pdev) &&
	    !(pcie_ports_dpc_native || hb->native_dpc))

quoted

  		return -ENOTSUPP;
  
  	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 50a9522..f2139a1 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c

@@ -256,7 +256,8 @@ static int get_port_device_capability(struct pci_dev *dev)
  	 */
  	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
  	    pci_aer_available() &&
-	    (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER)))
+	    (pcie_ports_dpc_native || host->native_dpc ||
+	     (services & PCIE_PORT_SERVICE_AER)))
  		services |= PCIE_PORT_SERVICE_DPC;
  
  	if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||