[PATCH v4 05/10] PCI: Move dev-enabled status bit to struct pci_dev

Philipp Stanner
2024-03-01T11:30:24Z

The bit describing whether the PCI device is currently enabled is stored
in struct pci_devres. Besides this struct being subject of a cleanup
process, struct pci_device is in general the right place to store this
information, since it is not devres-specific.

Move the 'enabled' boolean bit to struct pci_dev.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
drivers/pci/devres.c | 11 ++++-------
drivers/pci/pci.c | 17 ++++++++++-------
drivers/pci/pci.h | 1 -
include/linux/pci.h | 1 +
4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index 03662760d629..6bf93c6cbb66 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -403,7 +403,7 @@ static void pcim_release(struct device *gendev, void *res)
if (this->restore_intx)
pci_intx(dev, this->orig_intx);

- if (this->enabled && !this->pinned)
+ if (!this->pinned)
pci_disable_device(dev);
}

@@ -446,14 +446,11 @@ int pcim_enable_device(struct pci_dev *pdev)
dr = get_pci_dr(pdev);
if (unlikely(!dr))
return -ENOMEM;
- if (dr->enabled)
- return 0;

rc = pci_enable_device(pdev);
- if (!rc) {
+ if (!rc)
pdev->is_managed = 1;
- dr->enabled = 1;
- }
+
return rc;
}
EXPORT_SYMBOL(pcim_enable_device);
@@ -471,7 +468,7 @@ void pcim_pin_device(struct pci_dev *pdev)
struct pci_devres *dr;

dr = find_pci_dr(pdev);
- WARN_ON(!dr || !dr->enabled);
+ WARN_ON(!dr || !pdev->enabled);
if (dr)
dr->pinned = 1;
}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9ff52e840d9e..862dab87732a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1990,6 +1990,9 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
u16 cmd;
u8 pin;

+ if (dev->enabled)
+ return 0;
+
err = pci_set_power_state(dev, PCI_D0);
if (err < 0 && err != -EIO)
return err;
@@ -2004,7 +2007,7 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
pci_fixup_device(pci_fixup_enable, dev);

if (dev->msi_enabled || dev->msix_enabled)
- return 0;
+ goto success_out;

pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (pin) {
@@ -2014,6 +2017,8 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
cmd & ~PCI_COMMAND_INTX_DISABLE);
}

+success_out:
+ dev->enabled = true;
return 0;
}

@@ -2172,6 +2177,9 @@ static void do_pci_disable_device(struct pci_dev *dev)
{
u16 pci_command;

+ if (!dev->enabled)
+ return;
+
pci_read_config_word(dev, PCI_COMMAND, &pci_command);
if (pci_command & PCI_COMMAND_MASTER) {
pci_command &= ~PCI_COMMAND_MASTER;
@@ -2179,6 +2187,7 @@ static void do_pci_disable_device(struct pci_dev *dev)
}

pcibios_disable_device(dev);
+ dev->enabled = false;
}

/**
@@ -2206,12 +2215,6 @@ void pci_disable_enabled_device(struct pci_dev *dev)
*/
void pci_disable_device(struct pci_dev *dev)
{
- struct pci_devres *dr;
-
- dr = find_pci_dr(dev);
- if (dr)
- dr->enabled = 0;
-
dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0,
"disabling already-disabled device");

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 3452684e5611..97bd1c074d26 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -825,7 +825,6 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
* then remove them from here.
*/
struct pci_devres {
- unsigned int enabled:1;
unsigned int pinned:1;
unsigned int orig_intx:1;
unsigned int restore_intx:1;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8964ef9f2e9b..f29c9289b378 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -367,6 +367,7 @@ struct pci_dev {
this is D0-D3, D0 being fully
functional, and D3 being off. */
u8 pm_cap; /* PM capability offset */
+ unsigned int enabled:1; /* Whether this dev is enabled */
unsigned int imm_ready:1; /* Supports Immediate Readiness */
unsigned int pme_support:5; /* Bitmask of states from which PME#
can be generated */
--
2.43.0