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PCI: pciehp: Resume parent to D0 on config space access

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Ensure accessibility of a hotplug port's config space when accessed via
sysfs by resuming its parent to D0.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
Lukas Wunner 2018-07-19 17:27:57 -05:00 committed by Bjorn Helgaas
parent 8350307454
commit 4417aa45c1
2 changed files with 21 additions and 0 deletions
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14
drivers/pci/hotplug/pciehp_core.c
View File

@ -26,6 +26,8 @@
#include <linux/interrupt.h>
#include <linux/time.h>
#include "../pci.h"
/* Global variables */
bool pciehp_debug;
bool pciehp_poll_mode;
@ -126,8 +128,11 @@ static void cleanup_slot(struct controller *ctrl)
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
{
struct slot *slot = hotplug_slot->private;
struct pci_dev *pdev = slot->ctrl->pcie->port;
pci_config_pm_runtime_get(pdev);
pciehp_set_attention_status(slot, status);
pci_config_pm_runtime_put(pdev);
return 0;
}
@ -150,8 +155,11 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct pci_dev *pdev = slot->ctrl->pcie->port;
pci_config_pm_runtime_get(pdev);
pciehp_get_power_status(slot, value);
pci_config_pm_runtime_put(pdev);
return 0;
}
@ -166,16 +174,22 @@ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct pci_dev *pdev = slot->ctrl->pcie->port;
pci_config_pm_runtime_get(pdev);
pciehp_get_latch_status(slot, value);
pci_config_pm_runtime_put(pdev);
return 0;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct pci_dev *pdev = slot->ctrl->pcie->port;
pci_config_pm_runtime_get(pdev);
pciehp_get_adapter_status(slot, value);
pci_config_pm_runtime_put(pdev);
return 0;
}

7
drivers/pci/hotplug/pciehp_hpc.c
View File

@ -322,7 +322,9 @@ int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot,
struct pci_dev *pdev = ctrl_dev(slot->ctrl);
u16 slot_ctrl;
pci_config_pm_runtime_get(pdev);
pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
pci_config_pm_runtime_put(pdev);
*status = (slot_ctrl & (PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC)) >> 6;
return 0;
}
@ -333,7 +335,9 @@ void pciehp_get_attention_status(struct slot *slot, u8 *status)
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_ctrl;
pci_config_pm_runtime_get(pdev);
pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
pci_config_pm_runtime_put(pdev);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n", __func__,
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl);
@ -408,9 +412,12 @@ int pciehp_set_raw_indicator_status(struct hotplug_slot *hotplug_slot,
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
struct pci_dev *pdev = ctrl_dev(ctrl);
pci_config_pm_runtime_get(pdev);
pcie_write_cmd_nowait(ctrl, status << 6,
PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC);
pci_config_pm_runtime_put(pdev);
return 0;
}