linux-kernel - [PATCH v3 06/10] PCI: Move pinned status bit to struct pci

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Message-ID: <20240206134000.23561-8-pstanner@redhat.com>
Date: Tue,  6 Feb 2024 14:39:52 +0100
From: Philipp Stanner <pstanner@...hat.com>
To: Hans de Goede <hdegoede@...hat.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sam Ravnborg <sam@...nborg.org>,
	dakr@...hat.com
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Philipp Stanner <pstanner@...hat.com>
Subject: [PATCH v3 06/10] PCI: Move pinned status bit to struct pci_dev

The bit describing whether the PCI device is currently pinned is stored
in struct pci_devres. To clean up and simplify the PCI devres API, it's
better if this information is stored in struct pci_dev, because it
allows for checking that device's pinned-status directly through
struct pci_dev.

This will later permit simplifying  pcim_enable_device().

Move the 'pinned' boolean bit to struct pci_dev.

Restructure bits in struct pci_dev so the pm / pme fields are next to
each other.

Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
 drivers/pci/devres.c | 14 ++++----------
 drivers/pci/pci.h    |  1 -
 include/linux/pci.h  |  5 +++--
 3 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index 3d84f13ec9b7..628cde665e77 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->pinned)
+	if (!dev->pinned)
 		pci_disable_device(dev);
 }
 
@@ -461,18 +461,12 @@ EXPORT_SYMBOL(pcim_enable_device);
  * pcim_pin_device - Pin managed PCI device
  * @pdev: PCI device to pin
  *
- * Pin managed PCI device @pdev.  Pinned device won't be disabled on
- * driver detach.  @pdev must have been enabled with
- * pcim_enable_device().
+ * Pin managed PCI device @pdev. Pinned device won't be disabled on driver
+ * detach. @pdev must have been enabled with pcim_enable_device().
  */
 void pcim_pin_device(struct pci_dev *pdev)
 {
-	struct pci_devres *dr;
-
-	dr = find_pci_dr(pdev);
-	WARN_ON(!dr || !pdev->enabled);
-	if (dr)
-		dr->pinned = 1;
+	pdev->pinned = true;
 }
 EXPORT_SYMBOL(pcim_pin_device);
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9038d7c822ae..586b2047c275 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -811,7 +811,6 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
  * when a device is enabled using managed PCI device enable interface.
  */
 struct pci_devres {
-	unsigned int pinned:1;
 	unsigned int orig_intx:1;
 	unsigned int restore_intx:1;
 	unsigned int mwi:1;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index f3ed3ee6b9c4..3d8e75a8b3f6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -367,11 +367,12 @@ 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 */
 	unsigned int	pme_poll:1;	/* Poll device's PME status bit */
+	unsigned int	enabled:1;	/* Whether this dev is enabled */
+	unsigned int	pinned:1;	/* Whether this dev is pinned */
+	unsigned int	imm_ready:1;	/* Supports Immediate Readiness */
 	unsigned int	d1_support:1;	/* Low power state D1 is supported */
 	unsigned int	d2_support:1;	/* Low power state D2 is supported */
 	unsigned int	no_d1d2:1;	/* D1 and D2 are forbidden */
-- 
2.43.0