[PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
struct pci_host_bridge PCIe specific native_* members to "1" is
incorrect. So protect the PCIe specific member initialization
with CONFIG_PCIEPORTBUS.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/probe.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 03d37128a24f..0da0fc034413 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
 	 * may implement its own AER handling and use _OSC to prevent the
 	 * OS from interfering.
 	 */
+#ifdef CONFIG_PCIEPORTBUS
 	bridge->native_aer = 1;
 	bridge->native_pcie_hotplug = 1;
-	bridge->native_shpc_hotplug = 1;
 	bridge->native_pme = 1;
-	bridge->native_ltr = 1;
 	bridge->native_dpc = 1;
+#endif
+	bridge->native_ltr = 1;
+	bridge->native_shpc_hotplug = 1;
 
 	device_initialize(&bridge->dev);
 }
-- 
2.17.1

[PATCH v9 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native is set.

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

pcie_ports_dpc_native is set only if user requests native handling
of PCIe DPC capability via pcie_port_setup command line option.
User input takes precedence over _OSC based control negotiation
result. So consider the _OSC negotiated result for DPC ownership
only if pcie_ports_dpc_native is unset.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/acpi/pci_root.c         | 8 ++++++--
 drivers/pci/pcie/dpc.c          | 3 ++-
 drivers/pci/pcie/portdrv.h      | 2 --
 drivers/pci/pcie/portdrv_core.c | 2 +-
 include/linux/pci.h             | 2 ++
 5 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 9749b7abdd7e..979d03494476 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -935,8 +935,12 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 			    host_bridge->native_ltr);
 		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
 			    host_bridge->native_dpc);
-	  }
-
+		  if (pcie_ports_dpc_native)
+			  dev_warn(&bus->dev, "OS forcibly taking over DPC\n");
+		  else
+			  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
+				    host_bridge->native_dpc);
+		}
 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
 		host_bridge->native_shpc_hotplug = 0;
 
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index daa9a4153776..5b1025a2994d 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,11 +280,12 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
+	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native)
+	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
 		return -ENOTSUPP;
 
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index af7cf237432a..0ac20feef24e 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -25,8 +25,6 @@
 
 #define PCIE_PORT_DEVICE_MAXSERVICES   5
 
-extern bool pcie_ports_dpc_native;
-
 #ifdef CONFIG_PCIEAER
 int pcie_aer_init(void);
 int pcie_aer_is_native(struct pci_dev *dev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index ccd5e0ce5605..2c0278f0fdcc 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -253,7 +253,7 @@ 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)))
+	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
 	if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 835530605c0d..dc03b6c65742 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1556,9 +1556,11 @@ static inline int pci_irqd_intx_xlate(struct irq_domain *d,
 #ifdef CONFIG_PCIEPORTBUS
 extern bool pcie_ports_disabled;
 extern bool pcie_ports_native;
+extern bool pcie_ports_dpc_native;
 #else
 #define pcie_ports_disabled	true
 #define pcie_ports_native	false
+#define pcie_ports_dpc_native	false
 #endif
 
 #define PCIE_LINK_STATE_L0S		BIT(0)
-- 
2.17.1

[PATCH v9 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Currently, AER and DPC Capabilities dependency checks is
distributed between DPC and portdrv service drivers. So move
them out of DPC driver.

Also, since services & PCIE_PORT_SERVICE_AER check already
ensures AER native ownership, no need to add additional
pcie_aer_is_native() check.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pcie/dpc.c          | 4 ----
 drivers/pci/pcie/portdrv_core.c | 1 +
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 5b1025a2994d..6261b0382f65 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,14 +280,10 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
-	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
-		return -ENOTSUPP;
-
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
 					   dpc_handler, IRQF_SHARED,
 					   "pcie-dpc", pdev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index e257a2ca3595..ffa1d9fc458e 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -252,6 +252,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * permission to use AER.
 	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
+	    host->native_dpc &&
 	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
-- 
2.17.1

Re: [PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[Bjorn Helgaas]

I got 1/5, 3/5, and 5/5 (and no cover letter).  Is there a 2/5 and a
4/5?  Not sure if I should wait for more, or review these three as-is?

On Fri, Sep 18, 2020 at 12:58:30PM -0700, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> 
> If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
> struct pci_host_bridge PCIe specific native_* members to "1" is
> incorrect. So protect the PCIe specific member initialization
> with CONFIG_PCIEPORTBUS.
> 
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> ---
>  drivers/pci/probe.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 03d37128a24f..0da0fc034413 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
>  	 * may implement its own AER handling and use _OSC to prevent the
>  	 * OS from interfering.
>  	 */
> +#ifdef CONFIG_PCIEPORTBUS
>  	bridge->native_aer = 1;
>  	bridge->native_pcie_hotplug = 1;
> -	bridge->native_shpc_hotplug = 1;
>  	bridge->native_pme = 1;
> -	bridge->native_ltr = 1;
>  	bridge->native_dpc = 1;
> +#endif
> +	bridge->native_ltr = 1;
> +	bridge->native_shpc_hotplug = 1;
>  
>  	device_initialize(&bridge->dev);
>  }
> -- 
> 2.17.1
> 

Re: [PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[Kuppuswamy, Sathyanarayanan]

On 9/22/20 1:39 PM, Bjorn Helgaas wrote:
> I got 1/5, 3/5, and 5/5 (and no cover letter).  Is there a 2/5 and a
> 4/5?  Not sure if I should wait for more, or review these three as-is?
I sent all 5 together with cover letter. Do you want me to send it again ?
> 
> On Fri, Sep 18, 2020 at 12:58:30PM -0700, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>>
>> If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
>> struct pci_host_bridge PCIe specific native_* members to "1" is
>> incorrect. So protect the PCIe specific member initialization
>> with CONFIG_PCIEPORTBUS.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>> ---
>>   drivers/pci/probe.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index 03d37128a24f..0da0fc034413 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
>>   	 * may implement its own AER handling and use _OSC to prevent the
>>   	 * OS from interfering.
>>   	 */
>> +#ifdef CONFIG_PCIEPORTBUS
>>   	bridge->native_aer = 1;
>>   	bridge->native_pcie_hotplug = 1;
>> -	bridge->native_shpc_hotplug = 1;
>>   	bridge->native_pme = 1;
>> -	bridge->native_ltr = 1;
>>   	bridge->native_dpc = 1;
>> +#endif
>> +	bridge->native_ltr = 1;
>> +	bridge->native_shpc_hotplug = 1;
>>   
>>   	device_initialize(&bridge->dev);
>>   }
>> -- 
>> 2.17.1
>>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

[PATCH v9 0/5] Simplify PCIe native ownership detection logic

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Currently, PCIe capabilities ownership status is detected by
verifying the status of pcie_ports_native, pcie_ports_dpc_native
and _OSC negotiated results (cached in  struct pci_host_bridge
->native_* members). But this logic can be simplified, and we can
use only struct pci_host_bridge ->native_* members to detect it. 

This patchset removes the distributed checks for pcie_ports_native,
pcie_ports_dpc_native parameters.

Changes since v8:
 * Simplified setting _OSC ownwership logic
 * Moved bridge->native_ltr out of #ifdef CONFIG_PCIEPORTBUS.

Changes since v7:
 * Fixed "fix array_size.cocci warnings".

Changes since v6:
 * Created new patch for CONFIG_PCIEPORTBUS check in
   pci_init_host_bridge().
 * Added warning message for a case when pcie_ports_native
   overrides _OSC negotiation result.

Changes since v5:
 * Rebased on top of v5.8-rc1

Changes since v4:
 * Changed the patch set title (Original link: https://lkml.org/lkml/2020/5/26/1710)
 * Added AER/DPC dependency logic cleanup fixes.
 

Kuppuswamy Sathyanarayanan (5):
  PCI: Conditionally initialize host bridge native_* members
  ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set.
  ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native
    is set.
  PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable
    logic
  PCI/DPC: Move AER/DPC dependency checks out of DPC driver

 drivers/acpi/pci_root.c           | 37 ++++++++++++++++++++++---------
 drivers/pci/hotplug/pciehp_core.c |  2 +-
 drivers/pci/pci-acpi.c            |  3 ---
 drivers/pci/pcie/aer.c            |  2 +-
 drivers/pci/pcie/dpc.c            |  3 ---
 drivers/pci/pcie/portdrv.h        |  2 --
 drivers/pci/pcie/portdrv_core.c   | 13 +++++------
 drivers/pci/probe.c               |  6 +++--
 include/linux/acpi.h              |  2 ++
 include/linux/pci.h               |  2 ++
 10 files changed, 42 insertions(+), 30 deletions(-)

-- 
2.17.1

[PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
struct pci_host_bridge PCIe specific native_* members to "1" is
incorrect. So protect the PCIe specific member initialization
with CONFIG_PCIEPORTBUS.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/probe.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 03d37128a24f..0da0fc034413 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
 	 * may implement its own AER handling and use _OSC to prevent the
 	 * OS from interfering.
 	 */
+#ifdef CONFIG_PCIEPORTBUS
 	bridge->native_aer = 1;
 	bridge->native_pcie_hotplug = 1;
-	bridge->native_shpc_hotplug = 1;
 	bridge->native_pme = 1;
-	bridge->native_ltr = 1;
 	bridge->native_dpc = 1;
+#endif
+	bridge->native_ltr = 1;
+	bridge->native_shpc_hotplug = 1;
 
 	device_initialize(&bridge->dev);
 }
-- 
2.17.1

[PATCH v9 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native is set.

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

pcie_ports_dpc_native is set only if user requests native handling
of PCIe DPC capability via pcie_port_setup command line option.
User input takes precedence over _OSC based control negotiation
result. So consider the _OSC negotiated result for DPC ownership
only if pcie_ports_dpc_native is unset.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/acpi/pci_root.c         | 8 ++++++--
 drivers/pci/pcie/dpc.c          | 3 ++-
 drivers/pci/pcie/portdrv.h      | 2 --
 drivers/pci/pcie/portdrv_core.c | 2 +-
 include/linux/pci.h             | 2 ++
 5 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 9749b7abdd7e..979d03494476 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -935,8 +935,12 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 			    host_bridge->native_ltr);
 		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
 			    host_bridge->native_dpc);
-	  }
-
+		  if (pcie_ports_dpc_native)
+			  dev_warn(&bus->dev, "OS forcibly taking over DPC\n");
+		  else
+			  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
+				    host_bridge->native_dpc);
+		}
 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
 		host_bridge->native_shpc_hotplug = 0;
 
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index daa9a4153776..5b1025a2994d 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,11 +280,12 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
+	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native)
+	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
 		return -ENOTSUPP;
 
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index af7cf237432a..0ac20feef24e 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -25,8 +25,6 @@
 
 #define PCIE_PORT_DEVICE_MAXSERVICES   5
 
-extern bool pcie_ports_dpc_native;
-
 #ifdef CONFIG_PCIEAER
 int pcie_aer_init(void);
 int pcie_aer_is_native(struct pci_dev *dev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index ccd5e0ce5605..2c0278f0fdcc 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -253,7 +253,7 @@ 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)))
+	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
 	if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 835530605c0d..dc03b6c65742 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1556,9 +1556,11 @@ static inline int pci_irqd_intx_xlate(struct irq_domain *d,
 #ifdef CONFIG_PCIEPORTBUS
 extern bool pcie_ports_disabled;
 extern bool pcie_ports_native;
+extern bool pcie_ports_dpc_native;
 #else
 #define pcie_ports_disabled	true
 #define pcie_ports_native	false
+#define pcie_ports_dpc_native	false
 #endif
 
 #define PCIE_LINK_STATE_L0S		BIT(0)
-- 
2.17.1

[PATCH v9 4/5] PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable logic

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

In DPC service enable logic, check for
services & PCIE_PORT_SERVICE_AER implies pci_aer_available()
is true. So there is no need to explicitly check it again.

Also, passing pcie_ports=dpc-native in kernel command line
implies DPC needs to be enabled in native mode irrespective
of AER ownership status. So checking for pci_aer_available()
without checking for pcie_ports status is incorrect.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pcie/portdrv_core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 2c0278f0fdcc..e257a2ca3595 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -252,7 +252,6 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * permission to use AER.
 	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
-	    pci_aer_available() &&
 	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
-- 
2.17.1

[PATCH v9 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver

[sathyanarayanan.kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Currently, AER and DPC Capabilities dependency checks is
distributed between DPC and portdrv service drivers. So move
them out of DPC driver.

Also, since services & PCIE_PORT_SERVICE_AER check already
ensures AER native ownership, no need to add additional
pcie_aer_is_native() check.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pcie/dpc.c          | 4 ----
 drivers/pci/pcie/portdrv_core.c | 1 +
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 5b1025a2994d..6261b0382f65 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,14 +280,10 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
-	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
-		return -ENOTSUPP;
-
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
 					   dpc_handler, IRQF_SHARED,
 					   "pcie-dpc", pdev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index e257a2ca3595..ffa1d9fc458e 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -252,6 +252,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * permission to use AER.
 	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
+	    host->native_dpc &&
 	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
-- 
2.17.1

Re: [PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[Bjorn Helgaas]

[+cc Sean]

On Tue, Sep 22, 2020 at 01:50:21PM -0700, Kuppuswamy, Sathyanarayanan wrote:
> On 9/22/20 1:39 PM, Bjorn Helgaas wrote:
> > I got 1/5, 3/5, and 5/5 (and no cover letter).  Is there a 2/5 and a
> > 4/5?  Not sure if I should wait for more, or review these three as-is?
> I sent all 5 together with cover letter. Do you want me to send it again ?

I guess so.  I'm starting to suspect something wrong with Intel's
email path.

Sean had a similar problem a few days ago, and he re-sent the series,
and the resend also has the same problem.

[PATCH v9 0/5] Simplify PCIe native ownership detection logic

[Kuppuswamy Sathyanarayanan]

Currently, PCIe capabilities ownership status is detected by
verifying the status of pcie_ports_native, pcie_ports_dpc_native
and _OSC negotiated results (cached in  struct pci_host_bridge
->native_* members). But this logic can be simplified, and we can
use only struct pci_host_bridge ->native_* members to detect it. 

This patchset removes the distributed checks for pcie_ports_native,
pcie_ports_dpc_native parameters.

Changes since v8:
 * Simplified setting _OSC ownwership logic
 * Moved bridge->native_ltr out of #ifdef CONFIG_PCIEPORTBUS.

Changes since v7:
 * Fixed "fix array_size.cocci warnings".

Changes since v6:
 * Created new patch for CONFIG_PCIEPORTBUS check in
   pci_init_host_bridge().
 * Added warning message for a case when pcie_ports_native
   overrides _OSC negotiation result.

Changes since v5:
 * Rebased on top of v5.8-rc1

Changes since v4:
 * Changed the patch set title (Original link: https://lkml.org/lkml/2020/5/26/1710)
 * Added AER/DPC dependency logic cleanup fixes.
 

Kuppuswamy Sathyanarayanan (5):
  PCI: Conditionally initialize host bridge native_* members
  ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set.
  ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native
    is set.
  PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable
    logic
  PCI/DPC: Move AER/DPC dependency checks out of DPC driver

 drivers/acpi/pci_root.c           | 37 ++++++++++++++++++++++---------
 drivers/pci/hotplug/pciehp_core.c |  2 +-
 drivers/pci/pci-acpi.c            |  3 ---
 drivers/pci/pcie/aer.c            |  2 +-
 drivers/pci/pcie/dpc.c            |  3 ---
 drivers/pci/pcie/portdrv.h        |  2 --
 drivers/pci/pcie/portdrv_core.c   | 13 +++++------
 drivers/pci/probe.c               |  6 +++--
 include/linux/acpi.h              |  2 ++
 include/linux/pci.h               |  2 ++
 10 files changed, 42 insertions(+), 30 deletions(-)

-- 
2.17.1

[PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members

[Kuppuswamy Sathyanarayanan]

If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
struct pci_host_bridge PCIe specific native_* members to "1" is
incorrect. So protect the PCIe specific member initialization
with CONFIG_PCIEPORTBUS.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/probe.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 03d37128a24f..0da0fc034413 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
 	 * may implement its own AER handling and use _OSC to prevent the
 	 * OS from interfering.
 	 */
+#ifdef CONFIG_PCIEPORTBUS
 	bridge->native_aer = 1;
 	bridge->native_pcie_hotplug = 1;
-	bridge->native_shpc_hotplug = 1;
 	bridge->native_pme = 1;
-	bridge->native_ltr = 1;
 	bridge->native_dpc = 1;
+#endif
+	bridge->native_ltr = 1;
+	bridge->native_shpc_hotplug = 1;
 
 	device_initialize(&bridge->dev);
 }
-- 
2.17.1

[PATCH v9 2/5] ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set.

[Kuppuswamy Sathyanarayanan]

pcie_ports_native is set only if user requests native handling
of PCIe capabilities via pcie_port_setup command line option.
User input takes precedence over _OSC based control negotiation
result. So consider the _OSC negotiated result only if
pcie_ports_native is unset.

Also, since struct pci_host_bridge ->native_* members caches the
ownership status of various PCIe capabilities, use them instead
of distributed checks for pcie_ports_native.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/acpi/pci_root.c           | 33 +++++++++++++++++++++----------
 drivers/pci/hotplug/pciehp_core.c |  2 +-
 drivers/pci/pci-acpi.c            |  3 ---
 drivers/pci/pcie/aer.c            |  2 +-
 drivers/pci/pcie/portdrv_core.c   |  9 +++------
 include/linux/acpi.h              |  2 ++
 6 files changed, 30 insertions(+), 21 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index f90e841c59f5..9749b7abdd7e 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -43,6 +43,10 @@ static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
 				| OSC_PCI_CLOCK_PM_SUPPORT \
 				| OSC_PCI_MSI_SUPPORT)
 
+#define OSC_OWNER(ctrl, bit, flag) \
+	if (!(ctrl & bit)) \
+		flag = 0;
+
 static const struct acpi_device_id root_device_ids[] = {
 	{"PNP0A03", 0},
 	{"", 0},
@@ -889,6 +893,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 	struct pci_bus *bus;
 	struct pci_host_bridge *host_bridge;
 	union acpi_object *obj;
+	u32 ctrl;
 
 	info->root = root;
 	info->bridge = device;
@@ -914,18 +919,26 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 		goto out_release_info;
 
 	host_bridge = to_pci_host_bridge(bus->bridge);
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
-		host_bridge->native_pcie_hotplug = 0;
+
+	  if (pcie_ports_native) {
+		  decode_osc_control(root, "OS forcibly taking over",
+				     OSC_PCI_EXPRESS_CONTROL_MASKS);
+	  } else {
+		  ctrl = root->osc_control_set;
+		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_NATIVE_HP_CONTROL,
+			    host_bridge->native_pcie_hotplug);
+		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_AER_CONTROL,
+			    host_bridge->native_aer);
+		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_PME_CONTROL,
+			    host_bridge->native_pme);
+		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_LTR_CONTROL,
+			    host_bridge->native_ltr);
+		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
+			    host_bridge->native_dpc);
+	  }
+
 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
 		host_bridge->native_shpc_hotplug = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
-		host_bridge->native_aer = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))
-		host_bridge->native_pme = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
-		host_bridge->native_ltr = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
-		host_bridge->native_dpc = 0;
 
 	/*
 	 * Evaluate the "PCI Boot Configuration" _DSM Function.  If it
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index ad3393930ecb..d1831e6bf60a 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -256,7 +256,7 @@ static bool pme_is_native(struct pcie_device *dev)
 	const struct pci_host_bridge *host;
 
 	host = pci_find_host_bridge(dev->port->bus);
-	return pcie_ports_native || host->native_pme;
+	return host->native_pme;
 }
 
 static void pciehp_disable_interrupt(struct pcie_device *dev)
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index d5869a03f748..2e53d8bf1fe5 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -800,9 +800,6 @@ bool pciehp_is_native(struct pci_dev *bridge)
 	if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
 		return false;
 
-	if (pcie_ports_native)
-		return true;
-
 	host = pci_find_host_bridge(bridge->bus);
 	return host->native_pcie_hotplug;
 }
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 65dff5f3457a..79bb441139c2 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -219,7 +219,7 @@ int pcie_aer_is_native(struct pci_dev *dev)
 	if (!dev->aer_cap)
 		return 0;
 
-	return pcie_ports_native || host->native_aer;
+	return host->native_aer;
 }
 
 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 50a9522ab07d..ccd5e0ce5605 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -208,8 +208,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
 	int services = 0;
 
-	if (dev->is_hotplug_bridge &&
-	    (pcie_ports_native || host->native_pcie_hotplug)) {
+	if (dev->is_hotplug_bridge && host->native_pcie_hotplug) {
 		services |= PCIE_PORT_SERVICE_HP;
 
 		/*
@@ -221,8 +220,7 @@ 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)) {
+	if (dev->aer_cap && pci_aer_available() && host->native_aer) {
 		services |= PCIE_PORT_SERVICE_AER;
 
 		/*
@@ -238,8 +236,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * Event Collectors can also generate PMEs, but we don't handle
 	 * those yet.
 	 */
-	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
-	    (pcie_ports_native || host->native_pme)) {
+	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT && host->native_pme) {
 		services |= PCIE_PORT_SERVICE_PME;
 
 		/*
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 1e4cdc6c7ae2..a1b2b16f34ce 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -569,6 +569,8 @@ extern bool osc_pc_lpi_support_confirmed;
 #define OSC_PCI_EXPRESS_LTR_CONTROL		0x00000020
 #define OSC_PCI_EXPRESS_DPC_CONTROL		0x00000080
 #define OSC_PCI_CONTROL_MASKS			0x000000bf
+/* Masks specific to PCIe Capabilities */
+#define OSC_PCI_EXPRESS_CONTROL_MASKS		0x000000bd
 
 #define ACPI_GSB_ACCESS_ATTRIB_QUICK		0x00000002
 #define ACPI_GSB_ACCESS_ATTRIB_SEND_RCV         0x00000004
-- 
2.17.1

[PATCH v9 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native is set.

[Kuppuswamy Sathyanarayanan]

pcie_ports_dpc_native is set only if user requests native handling
of PCIe DPC capability via pcie_port_setup command line option.
User input takes precedence over _OSC based control negotiation
result. So consider the _OSC negotiated result for DPC ownership
only if pcie_ports_dpc_native is unset.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/acpi/pci_root.c         | 8 ++++++--
 drivers/pci/pcie/dpc.c          | 3 ++-
 drivers/pci/pcie/portdrv.h      | 2 --
 drivers/pci/pcie/portdrv_core.c | 2 +-
 include/linux/pci.h             | 2 ++
 5 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 9749b7abdd7e..979d03494476 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -935,8 +935,12 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 			    host_bridge->native_ltr);
 		  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
 			    host_bridge->native_dpc);
-	  }
-
+		  if (pcie_ports_dpc_native)
+			  dev_warn(&bus->dev, "OS forcibly taking over DPC\n");
+		  else
+			  OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL,
+				    host_bridge->native_dpc);
+		}
 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
 		host_bridge->native_shpc_hotplug = 0;
 
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index daa9a4153776..5b1025a2994d 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,11 +280,12 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
+	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native)
+	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
 		return -ENOTSUPP;
 
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index af7cf237432a..0ac20feef24e 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -25,8 +25,6 @@
 
 #define PCIE_PORT_DEVICE_MAXSERVICES   5
 
-extern bool pcie_ports_dpc_native;
-
 #ifdef CONFIG_PCIEAER
 int pcie_aer_init(void);
 int pcie_aer_is_native(struct pci_dev *dev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index ccd5e0ce5605..2c0278f0fdcc 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -253,7 +253,7 @@ 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)))
+	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
 	if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 835530605c0d..dc03b6c65742 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1556,9 +1556,11 @@ static inline int pci_irqd_intx_xlate(struct irq_domain *d,
 #ifdef CONFIG_PCIEPORTBUS
 extern bool pcie_ports_disabled;
 extern bool pcie_ports_native;
+extern bool pcie_ports_dpc_native;
 #else
 #define pcie_ports_disabled	true
 #define pcie_ports_native	false
+#define pcie_ports_dpc_native	false
 #endif
 
 #define PCIE_LINK_STATE_L0S		BIT(0)
-- 
2.17.1

[PATCH v9 4/5] PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable logic

[Kuppuswamy Sathyanarayanan]

In DPC service enable logic, check for
services & PCIE_PORT_SERVICE_AER implies pci_aer_available()
is true. So there is no need to explicitly check it again.

Also, passing pcie_ports=dpc-native in kernel command line
implies DPC needs to be enabled in native mode irrespective
of AER ownership status. So checking for pci_aer_available()
without checking for pcie_ports status is incorrect.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pcie/portdrv_core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 2c0278f0fdcc..e257a2ca3595 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -252,7 +252,6 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * permission to use AER.
 	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
-	    pci_aer_available() &&
 	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
-- 
2.17.1

[PATCH v9 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver

[Kuppuswamy Sathyanarayanan]

Currently, AER and DPC Capabilities dependency checks is
distributed between DPC and portdrv service drivers. So move
them out of DPC driver.

Also, since services & PCIE_PORT_SERVICE_AER check already
ensures AER native ownership, no need to add additional
pcie_aer_is_native() check.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pcie/dpc.c          | 4 ----
 drivers/pci/pcie/portdrv_core.c | 1 +
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 5b1025a2994d..6261b0382f65 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -280,14 +280,10 @@ void pci_dpc_init(struct pci_dev *pdev)
 static int dpc_probe(struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
-	struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
 	struct device *device = &dev->device;
 	int status;
 	u16 ctl, cap;
 
-	if (!pcie_aer_is_native(pdev) && !host->native_dpc)
-		return -ENOTSUPP;
-
 	status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
 					   dpc_handler, IRQF_SHARED,
 					   "pcie-dpc", pdev);
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index e257a2ca3595..ffa1d9fc458e 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -252,6 +252,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	 * permission to use AER.
 	 */
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
+	    host->native_dpc &&
 	    (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
 		services |= PCIE_PORT_SERVICE_DPC;
 
-- 
2.17.1

Re: [PATCH v9 0/5] Simplify PCIe native ownership detection logic

[Kuppuswamy, Sathyanarayanan]

Hi Bjorn,

On 9/27/20 6:11 PM, Kuppuswamy Sathyanarayanan wrote:
> Currently, PCIe capabilities ownership status is detected by
> verifying the status of pcie_ports_native, pcie_ports_dpc_native
> and _OSC negotiated results (cached in  struct pci_host_bridge
> ->native_* members). But this logic can be simplified, and we can
> use only struct pci_host_bridge ->native_* members to detect it.
> 
Did you get this patch set or do I need to send it again?
> This patchset removes the distributed checks for pcie_ports_native,
> pcie_ports_dpc_native parameters.
> 
> Changes since v8:
>   * Simplified setting _OSC ownwership logic
>   * Moved bridge->native_ltr out of #ifdef CONFIG_PCIEPORTBUS.
> 
> Changes since v7:
>   * Fixed "fix array_size.cocci warnings".
> 
> Changes since v6:
>   * Created new patch for CONFIG_PCIEPORTBUS check in
>     pci_init_host_bridge().
>   * Added warning message for a case when pcie_ports_native
>     overrides _OSC negotiation result.
> 
> Changes since v5:
>   * Rebased on top of v5.8-rc1
> 
> Changes since v4:
>   * Changed the patch set title (Original link: https://lkml.org/lkml/2020/5/26/1710)
>   * Added AER/DPC dependency logic cleanup fixes.
>   
> 
> Kuppuswamy Sathyanarayanan (5):
>    PCI: Conditionally initialize host bridge native_* members
>    ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set.
>    ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native
>      is set.
>    PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable
>      logic
>    PCI/DPC: Move AER/DPC dependency checks out of DPC driver
> 
>   drivers/acpi/pci_root.c           | 37 ++++++++++++++++++++++---------
>   drivers/pci/hotplug/pciehp_core.c |  2 +-
>   drivers/pci/pci-acpi.c            |  3 ---
>   drivers/pci/pcie/aer.c            |  2 +-
>   drivers/pci/pcie/dpc.c            |  3 ---
>   drivers/pci/pcie/portdrv.h        |  2 --
>   drivers/pci/pcie/portdrv_core.c   | 13 +++++------
>   drivers/pci/probe.c               |  6 +++--
>   include/linux/acpi.h              |  2 ++
>   include/linux/pci.h               |  2 ++
>   10 files changed, 42 insertions(+), 30 deletions(-)
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

Re: [PATCH v9 0/5] Simplify PCIe native ownership detection logic

[Bjorn Helgaas]

On Tue, Sep 29, 2020 at 4:00 PM Kuppuswamy, Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
>
> Hi Bjorn,
>
> On 9/27/20 6:11 PM, Kuppuswamy Sathyanarayanan wrote:
> > Currently, PCIe capabilities ownership status is detected by
> > verifying the status of pcie_ports_native, pcie_ports_dpc_native
> > and _OSC negotiated results (cached in  struct pci_host_bridge
> > ->native_* members). But this logic can be simplified, and we can
> > use only struct pci_host_bridge ->native_* members to detect it.
> >
> Did you get this patch set or do I need to send it again?

I got it, thanks.  More importantly, it looks like linux-pci got it, too :)

$ b4 am -om/ https://lore.kernel.org/r/a640e9043db50f5adee8e38f5c60ff8423f3f598.1600457297.git.sathyanarayanan.kuppuswamy@linux.intel.com
Looking up https://lore.kernel.org/r/a640e9043db50f5adee8e38f5c60ff8423f3f598.1600457297.git.sathyanarayanan.kuppuswamy%40linux.intel.com
Grabbing thread from lore.kernel.org/linux-pci
Reduced thread to strict matches only (18->10)
Analyzing 10 messages in the thread
---
Writing m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.mbx
  [PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members
  [PATCH v9 2/5] ACPI/PCI: Ignore _OSC negotiation result if
pcie_ports_native is set.
  [PATCH v9 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if
pcie_ports_dpc_native is set.
  [PATCH v9 4/5] PCI/portdrv: Remove redundant pci_aer_available()
check in DPC enable logic
  [PATCH v9 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver
---
Total patches: 5
---
Cover: m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.cover
 Link: https://lore.kernel.org/r/cover.1600457297.git.sathyanarayanan.kuppuswamy@linux.intel.com
 Base: not found (applies clean to current tree)
       git am m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.mbx

Re: [PATCH v9 0/5] Simplify PCIe native ownership detection logic

[Kuppuswamy, Sathyanarayanan]

Hi,

On 9/29/20 2:04 PM, Bjorn Helgaas wrote:
> On Tue, Sep 29, 2020 at 4:00 PM Kuppuswamy, Sathyanarayanan
> <sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
>>
>> Hi Bjorn,
>>
>> On 9/27/20 6:11 PM, Kuppuswamy Sathyanarayanan wrote:
>>> Currently, PCIe capabilities ownership status is detected by
>>> verifying the status of pcie_ports_native, pcie_ports_dpc_native
>>> and _OSC negotiated results (cached in  struct pci_host_bridge
>>> ->native_* members). But this logic can be simplified, and we can
>>> use only struct pci_host_bridge ->native_* members to detect it.
>>>
>> Did you get this patch set or do I need to send it again?
> 
> I got it, thanks.  More importantly, it looks like linux-pci got it, too :)
Thanks for the confirmation.
> 
> $ b4 am -om/ https://lore.kernel.org/r/a640e9043db50f5adee8e38f5c60ff8423f3f598.1600457297.git.sathyanarayanan.kuppuswamy@linux.intel.com
> Looking up https://lore.kernel.org/r/a640e9043db50f5adee8e38f5c60ff8423f3f598.1600457297.git.sathyanarayanan.kuppuswamy%40linux.intel.com
> Grabbing thread from lore.kernel.org/linux-pci
> Reduced thread to strict matches only (18->10)
> Analyzing 10 messages in the thread
> ---
> Writing m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.mbx
>    [PATCH v9 1/5] PCI: Conditionally initialize host bridge native_* members
>    [PATCH v9 2/5] ACPI/PCI: Ignore _OSC negotiation result if
> pcie_ports_native is set.
>    [PATCH v9 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if
> pcie_ports_dpc_native is set.
>    [PATCH v9 4/5] PCI/portdrv: Remove redundant pci_aer_available()
> check in DPC enable logic
>    [PATCH v9 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver
> ---
> Total patches: 5
> ---
> Cover: m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.cover
>   Link: https://lore.kernel.org/r/cover.1600457297.git.sathyanarayanan.kuppuswamy@linux.intel.com
>   Base: not found (applies clean to current tree)
>         git am m/v9_20200922_sathyanarayanan_kuppuswamy_simplify_pcie_native_ownership_detection_logic.mbx
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer