linux-kernel - [PATCH v7 04/13] PCI: Deprecate two surplus devres functions

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Date: Wed,  5 Jun 2024 10:15:56 +0200
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 v7 04/13] PCI: Deprecate two surplus devres functions

pcim_iomap_table() should not be used anymore because it contributed to
the PCI devres API being designed contrary to devres's design goals.

pcim_iomap_regions_request_all() is a surplus, complicated function
that can easily be replaced by using a pcim_* request function in
combination with a pcim_* mapping function.

Mark pcim_iomap_table() and pcim_iomap_regions_request_all() as
deprecated in the function documentation.

Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
 drivers/pci/devres.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index e6e791c9db6e..f199f610ae51 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -501,7 +501,7 @@ static void pcim_iomap_release(struct device *gendev, void *res)
 }
 
 /**
- * pcim_iomap_table - access iomap allocation table
+ * pcim_iomap_table - access iomap allocation table (DEPRECATED)
  * @pdev: PCI device to access iomap table for
  *
  * Returns:
@@ -515,6 +515,11 @@ static void pcim_iomap_release(struct device *gendev, void *res)
  * This function might sleep when the table is first allocated but can
  * be safely called without context and guaranteed to succeed once
  * allocated.
+ *
+ * This function is DEPRECATED. Do not use it in new code. Instead, obtain a
+ * mapping's address directly from one of the pcim_* mapping functions. For
+ * example:
+ * void __iomem *mappy = pcim_iomap(pdev, barnr, length);
  */
 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 {
@@ -886,7 +891,7 @@ static int pcim_request_all_regions(struct pci_dev *pdev, const char *name)
 }
 
 /**
- * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
+ * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones (DEPRECATED)
  * @pdev: PCI device to map IO resources for
  * @mask: Mask of BARs to iomap
  * @name: Name associated with the requests
@@ -897,6 +902,9 @@ static int pcim_request_all_regions(struct pci_dev *pdev, const char *name)
  *
  * To release these resources manually, call pcim_release_region() for the
  * regions and pcim_iounmap() for the mappings.
+ *
+ * This function is DEPRECATED. Don't use it in new code. Instead, use one of the
+ * pcim_* region request functions in combination with a pcim_* mapping function.
  */
 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 				   const char *name)
-- 
2.45.0