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PCI: shpchp: Add shpchp_is_native()

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In the same way we do for pciehp, add shpchp_is_native(), which returns
true if the bridge should be handled by the native SHPC driver.  Then
convert the driver to use this function.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Mika Westerberg 2018-05-31 11:42:11 -05:00 committed by Bjorn Helgaas
parent bed4e9cfab
commit 90cc0c3cc7
6 changed files with 35 additions and 16 deletions
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4
drivers/pci/hotplug/acpi_pcihp.c
View File

@ -83,11 +83,11 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev)
* OSHP within the scope of the hotplug controller and its parents,
* up to the host bridge under which this controller exists.
*/
host = pci_find_host_bridge(pdev->bus);
if (host->native_shpc_hotplug)
if (shpchp_is_native(pdev))
return 0;
/* If _OSC exists, we should not evaluate OSHP */
host = pci_find_host_bridge(pdev->bus);
root = acpi_pci_find_root(ACPI_HANDLE(&host->dev));
if (root->osc_support_set)
goto no_control;

1
drivers/pci/hotplug/shpchp.h
View File

@ -105,7 +105,6 @@ struct controller {
};
/* Define AMD SHPC ID */
#define PCI_DEVICE_ID_AMD_GOLAM_7450 0x7450
#define PCI_DEVICE_ID_AMD_POGO_7458 0x7458
/* AMD PCI-X bridge registers */

14
drivers/pci/hotplug/shpchp_core.c
View File

@ -270,24 +270,12 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
return 0;
}
static int is_shpc_capable(struct pci_dev *dev)
{
if (dev->vendor == PCI_VENDOR_ID_AMD &&
dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
return 1;
if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
return 0;
if (acpi_get_hp_hw_control_from_firmware(dev))
return 0;
return 1;
}
static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;
struct controller *ctrl;
if (!is_shpc_capable(pdev))
if (acpi_get_hp_hw_control_from_firmware(pdev))
return -ENODEV;
ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);

29
drivers/pci/pci-acpi.c
View File

@ -394,6 +394,35 @@ bool pciehp_is_native(struct pci_dev *bridge)
return host->native_pcie_hotplug;
}
/**
* shpchp_is_native - Check whether a hotplug port is handled by the OS
* @bridge: Hotplug port to check
*
* Returns true if the given @bridge is handled by the native SHPC hotplug
* driver.
*/
bool shpchp_is_native(struct pci_dev *bridge)
{
const struct pci_host_bridge *host;
if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
return false;
/*
* It is assumed that AMD GOLAM chips support SHPC but they do not
* have SHPC capability.
*/
if (bridge->vendor == PCI_VENDOR_ID_AMD &&
bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
return true;
if (!pci_find_capability(bridge, PCI_CAP_ID_SHPC))
return false;
host = pci_find_host_bridge(bridge->bus);
return host->native_shpc_hotplug;
}
/**
* pci_acpi_wake_bus - Root bus wakeup notification fork function.
* @context: Device wakeup context.

2
include/linux/pci_hotplug.h
View File

@ -164,6 +164,7 @@ struct hotplug_params {
int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
bool pciehp_is_native(struct pci_dev *bridge);
int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge);
bool shpchp_is_native(struct pci_dev *bridge);
int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
int acpi_pci_detect_ejectable(acpi_handle handle);
#else
@ -178,5 +179,6 @@ static inline int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge)
return 0;
}
static inline bool pciehp_is_native(struct pci_dev *bridge) { return true; }
static inline bool shpchp_is_native(struct pci_dev *bridge) { return true; }
#endif
#endif

1
include/linux/pci_ids.h
View File

@ -561,6 +561,7 @@
#define PCI_DEVICE_ID_AMD_OPUS_7443 0x7443
#define PCI_DEVICE_ID_AMD_VIPER_7443 0x7443
#define PCI_DEVICE_ID_AMD_OPUS_7445 0x7445
#define PCI_DEVICE_ID_AMD_GOLAM_7450 0x7450
#define PCI_DEVICE_ID_AMD_8111_PCI 0x7460
#define PCI_DEVICE_ID_AMD_8111_LPC 0x7468
#define PCI_DEVICE_ID_AMD_8111_IDE 0x7469