[v4,3/3] PCI/ACPI: Add pci_acpi_program_hest_aer_params()

From: LeoLiuoc <LeoLiu-oc@zhaoxin.com>

Call the func pci_acpi_program_hest_aer_params() for every PCIe device,
the purpose of this function is to extract register value from HEST PCIe
AER structures and program them into AER Capabilities. This function
applies to all hardware platforms that has a PCI Express AER structure
in HEST.

Signed-off-by: LeoLiuoc <LeoLiu-oc@zhaoxin.com>
---
 drivers/pci/pci-acpi.c | 103 +++++++++++++++++++++++++++++++++++++++++
 drivers/pci/pci.h      |   9 ++++
 drivers/pci/probe.c    |   1 +
 3 files changed, 113 insertions(+)

On Thu, Dec 05, 2024 at 07:40:48PM +0800, LeoLiu-oc wrote:
> From: LeoLiuoc <LeoLiu-oc@zhaoxin.com>
> 
> Call the func pci_acpi_program_hest_aer_params() for every PCIe device,
> the purpose of this function is to extract register value from HEST PCIe
> AER structures and program them into AER Capabilities. This function
> applies to all hardware platforms that has a PCI Express AER structure
> in HEST.
> 
> Signed-off-by: LeoLiuoc <LeoLiu-oc@zhaoxin.com>
> ---
>  drivers/pci/pci-acpi.c | 103 +++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/pci.h      |   9 ++++
>  drivers/pci/probe.c    |   1 +
>  3 files changed, 113 insertions(+)
> 
> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> index af370628e583..6e29af8e6cc4 100644
> --- a/drivers/pci/pci-acpi.c
> +++ b/drivers/pci/pci-acpi.c
> @@ -19,6 +19,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/pm_qos.h>
>  #include <linux/rwsem.h>
> +#include <acpi/apei.h>
>  #include "pci.h"
>  
>  /*
> @@ -806,6 +807,108 @@ int pci_acpi_program_hp_params(struct pci_dev *dev)
>  	return -ENODEV;
>  }
>  
> +#ifdef CONFIG_ACPI_APEI
> +/*
> + * program_hest_aer_common() - configure AER common registers for Root Ports,
> + * Endpoints and PCIe to PCI/PCI-X bridges
> + */
> +static void program_hest_aer_common(struct acpi_hest_aer_common aer_common,
> +				    struct pci_dev *dev, int pos)
> +{
> +	u32 uncor_mask;
> +	u32 uncor_severity;
> +	u32 cor_mask;
> +	u32 adv_cap;
> +
> +	uncor_mask = aer_common.uncorrectable_mask;
> +	uncor_severity = aer_common.uncorrectable_severity;
> +	cor_mask = aer_common.correctable_mask;
> +	adv_cap = aer_common.advanced_capabilities;
> +

These can be done at the same time as the declarations. Same for the
remaining functions.

> +	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, uncor_mask);
> +	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, uncor_severity);
> +	pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, cor_mask);
> +	pci_write_config_dword(dev, pos + PCI_ERR_CAP, adv_cap);
> +}
> +
> +static void program_hest_aer_root(struct acpi_hest_aer_root *aer_root,
> +				  struct pci_dev *dev, int pos)
> +{
> +	u32 root_err_cmd;
> +
> +	root_err_cmd = aer_root->root_error_command;
> +
> +	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, root_err_cmd);
> +}
> +
> +static void program_hest_aer_bridge(struct acpi_hest_aer_bridge *hest_aer_bridge,
> +				    struct pci_dev *dev, int pos)
> +{
> +	u32 uncor_mask2;
> +	u32 uncor_severity2;
> +	u32 adv_cap2;
> +
> +	uncor_mask2 = hest_aer_bridge->uncorrectable_mask2;
> +	uncor_severity2 = hest_aer_bridge->uncorrectable_severity2;
> +	adv_cap2 = hest_aer_bridge->advanced_capabilities2;
> +
> +	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK2, uncor_mask2);
> +	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER2, uncor_severity2);
> +	pci_write_config_dword(dev, pos + PCI_ERR_CAP2, adv_cap2);
> +}
> +
> +static void program_hest_aer_params(struct hest_parse_aer_info info)
> +{
> +	struct pci_dev *dev;
> +	int port_type;
> +	int pos;
> +	struct acpi_hest_aer_root *hest_aer_root;
> +	struct acpi_hest_aer *hest_aer_endpoint;
> +	struct acpi_hest_aer_bridge *hest_aer_bridge;
> +
> +	dev = info.pci_dev;
> +	port_type = pci_pcie_type(dev);
> +	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
> +	if (!pos)
> +		return;
> +
> +	switch (port_type) {
> +	case PCI_EXP_TYPE_ROOT_PORT:
> +		hest_aer_root = info.hest_aer_root_port;
> +		program_hest_aer_common(hest_aer_root->aer, dev, pos);
> +		program_hest_aer_root(hest_aer_root, dev, pos);
> +	break;
> +	case PCI_EXP_TYPE_ENDPOINT:
> +		hest_aer_endpoint = info.hest_aer_endpoint;
> +		program_hest_aer_common(hest_aer_endpoint->aer, dev, pos);
> +	break;
> +	case PCI_EXP_TYPE_PCI_BRIDGE:
> +		hest_aer_bridge = info.hest_aer_bridge;
> +		program_hest_aer_common(hest_aer_bridge->aer, dev, pos);
> +		program_hest_aer_bridge(hest_aer_bridge, dev, pos);
> +	break;
> +	default:
> +		return;
> +	break;
> +	}
> +}
> +
> +int pci_acpi_program_hest_aer_params(struct pci_dev *dev)
> +{
> +	struct hest_parse_aer_info info = {
> +		.pci_dev = dev
> +	};
> +
> +	if (!pci_is_pcie(dev))
> +		return -ENODEV;
> +
> +	if (apei_hest_parse(hest_parse_pcie_aer, &info) == 1)

Don't need the "== 1".

> +		program_hest_aer_params(info);
> +
> +	return 0;
> +}
> +#endif
> +
>  /**
>   * pciehp_is_native - Check whether a hotplug port is handled by the OS
>   * @bridge: Hotplug port to check
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 2e40fc63ba31..78bdc121c905 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -897,6 +897,15 @@ static inline void pci_save_aer_state(struct pci_dev *dev) { }
>  static inline void pci_restore_aer_state(struct pci_dev *dev) { }
>  #endif
>  
> +#ifdef CONFIG_ACPI_APEI
> +int pci_acpi_program_hest_aer_params(struct pci_dev *dev);

The return value is never checked, so this can return void.

> +#else
> +static inline int pci_acpi_program_hest_aer_params(struct pci_dev *dev)
> +{
> +	return 0;
> +}
> +#endif
> +
>  #ifdef CONFIG_ACPI
>  bool pci_acpi_preserve_config(struct pci_host_bridge *bridge);
>  int pci_acpi_program_hp_params(struct pci_dev *dev);
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 2e81ab0f5a25..33b8b46ca554 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2304,6 +2304,7 @@ static void pci_configure_device(struct pci_dev *dev)
>  	pci_configure_serr(dev);
>  
>  	pci_acpi_program_hp_params(dev);
> +	pci_acpi_program_hest_aer_params(dev);

This should not be called here unconditionally.

OS should only write AER registers if granted permission through
_OSC.

It would be more appropriate to call this from pci_aer_init().

Thanks,
Yazen