Re: [PATCH v2 2/3] arch: Remove struct fb_info from video helpers

Hi

Am 28.03.24 um 12:04 schrieb Helge Deller:

On 3/27/24 21:41, Thomas Zimmermann wrote:

quoted

The per-architecture video helpers do not depend on struct fb_info
or anything else from fbdev. Remove it from the interface and replace
fb_is_primary_device() with video_is_primary_device(). The new helper

Since you rename this function, wouldn't something similar to

device_is_primary_display()
    or
device_is_primary_console()
    or
is_primary_graphics_device()
    or
is_primary_display_device()

be a better name?

The video_ prefix is there to signal that the code is part of the video 
subsystem.

But there's too much code that tried to figure out a default video 
device. So I actually have different plans for this function. I'd like 
to replace it with a helper that returns the default device instead of 
just testing for it. Sample code for x86 is already in vgaarb.c. [1] The 
function's name would then be video_default_device() and return the 
appropriate struct device*. video_is_primary device() will be removed. 
This rename here is the easiest step towards the new helper. Ok?

Best regards
Thomas

[1] https://elixir.bootlin.com/linux/v6.8/source/drivers/pci/vgaarb.c#L559

Helge

quoted

is similar in functionality, but can operate on non-fbdev devices.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Thomas Gleixner <redacted>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
  arch/parisc/include/asm/fb.h     |  8 +++++---
  arch/parisc/video/fbdev.c        |  9 +++++----
  arch/sparc/include/asm/fb.h      |  7 ++++---
  arch/sparc/video/fbdev.c         | 17 ++++++++---------
  arch/x86/include/asm/fb.h        |  8 +++++---
  arch/x86/video/fbdev.c           | 18 +++++++-----------
  drivers/video/fbdev/core/fbcon.c |  2 +-
  include/asm-generic/fb.h         | 11 ++++++-----
  8 files changed, 41 insertions(+), 39 deletions(-)

diff --git a/arch/parisc/include/asm/fb.h b/arch/parisc/include/asm/fb.h
index 658a8a7dc5312..ed2a195a3e762 100644
--- a/arch/parisc/include/asm/fb.h
+++ b/arch/parisc/include/asm/fb.h

@@ -2,11 +2,13 @@

  #ifndef _ASM_FB_H_
  #define _ASM_FB_H_

-struct fb_info;
+#include <linux/types.h>
+
+struct device;

  #if defined(CONFIG_STI_CORE)
-int fb_is_primary_device(struct fb_info *info);
-#define fb_is_primary_device fb_is_primary_device
+bool video_is_primary_device(struct device *dev);
+#define video_is_primary_device video_is_primary_device
  #endif

  #include <asm-generic/fb.h>

diff --git a/arch/parisc/video/fbdev.c b/arch/parisc/video/fbdev.c
index e4f8ac99fc9e0..540fa0c919d59 100644
--- a/arch/parisc/video/fbdev.c
+++ b/arch/parisc/video/fbdev.c

@@ -5,12 +5,13 @@

   * Copyright (C) 2001-2002 Thomas Bogendoerfer 
[off-list ref]
   */

-#include <linux/fb.h>
  #include <linux/module.h>

  #include <video/sticore.h>

-int fb_is_primary_device(struct fb_info *info)
+#include <asm/fb.h>
+
+bool video_is_primary_device(struct device *dev)
  {
      struct sti_struct *sti;

@@ -21,6 +22,6 @@ int fb_is_primary_device(struct fb_info *info)

          return true;

      /* return true if it's the default built-in framebuffer driver */
-    return (sti->dev == info->device);
+    return (sti->dev == dev);
  }
-EXPORT_SYMBOL(fb_is_primary_device);
+EXPORT_SYMBOL(video_is_primary_device);

diff --git a/arch/sparc/include/asm/fb.h b/arch/sparc/include/asm/fb.h
index 24440c0fda490..07f0325d6921c 100644
--- a/arch/sparc/include/asm/fb.h
+++ b/arch/sparc/include/asm/fb.h

@@ -3,10 +3,11 @@

  #define _SPARC_FB_H_

  #include <linux/io.h>
+#include <linux/types.h>

  #include <asm/page.h>

-struct fb_info;
+struct device;

  #ifdef CONFIG_SPARC32
  static inline pgprot_t pgprot_framebuffer(pgprot_t prot,

@@ -18,8 +19,8 @@ static inline pgprot_t pgprot_framebuffer(pgprot_t 

prot,
  #define pgprot_framebuffer pgprot_framebuffer
  #endif

-int fb_is_primary_device(struct fb_info *info);
-#define fb_is_primary_device fb_is_primary_device
+bool video_is_primary_device(struct device *dev);
+#define video_is_primary_device video_is_primary_device

  static inline void fb_memcpy_fromio(void *to, const volatile void 
__iomem *from, size_t n)
  {

diff --git a/arch/sparc/video/fbdev.c b/arch/sparc/video/fbdev.c
index bff66dd1909a4..e46f0499c2774 100644
--- a/arch/sparc/video/fbdev.c
+++ b/arch/sparc/video/fbdev.c

@@ -1,26 +1,25 @@

  // SPDX-License-Identifier: GPL-2.0

  #include <linux/console.h>
-#include <linux/fb.h>
+#include <linux/device.h>
  #include <linux/module.h>

+#include <asm/fb.h>
  #include <asm/prom.h>

-int fb_is_primary_device(struct fb_info *info)
+bool video_is_primary_device(struct device *dev)
  {
-    struct device *dev = info->device;
-    struct device_node *node;
+    struct device_node *node = dev->of_node;

      if (console_set_on_cmdline)
-        return 0;
+        return false;

-    node = dev->of_node;
      if (node && node == of_console_device)
-        return 1;
+        return true;

-    return 0;
+    return false;
  }
-EXPORT_SYMBOL(fb_is_primary_device);
+EXPORT_SYMBOL(video_is_primary_device);

  MODULE_DESCRIPTION("Sparc fbdev helpers");
  MODULE_LICENSE("GPL");

diff --git a/arch/x86/include/asm/fb.h b/arch/x86/include/asm/fb.h
index c3b9582de7efd..999db33792869 100644
--- a/arch/x86/include/asm/fb.h
+++ b/arch/x86/include/asm/fb.h

@@ -2,17 +2,19 @@

  #ifndef _ASM_X86_FB_H
  #define _ASM_X86_FB_H

+#include <linux/types.h>
+
  #include <asm/page.h>

-struct fb_info;
+struct device;

  pgprot_t pgprot_framebuffer(pgprot_t prot,
                  unsigned long vm_start, unsigned long vm_end,
                  unsigned long offset);
  #define pgprot_framebuffer pgprot_framebuffer

-int fb_is_primary_device(struct fb_info *info);
-#define fb_is_primary_device fb_is_primary_device
+bool video_is_primary_device(struct device *dev);
+#define video_is_primary_device video_is_primary_device

  #include <asm-generic/fb.h>

diff --git a/arch/x86/video/fbdev.c b/arch/x86/video/fbdev.c
index 1dd6528cc947c..4d87ce8e257fe 100644
--- a/arch/x86/video/fbdev.c
+++ b/arch/x86/video/fbdev.c

@@ -7,7 +7,6 @@

   *
   */

-#include <linux/fb.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/vgaarb.h>

@@ -25,20 +24,17 @@ pgprot_t pgprot_framebuffer(pgprot_t prot,

  }
  EXPORT_SYMBOL(pgprot_framebuffer);

-int fb_is_primary_device(struct fb_info *info)
+bool video_is_primary_device(struct device *dev)
  {
-    struct device *device = info->device;
-    struct pci_dev *pci_dev;
+    struct pci_dev *pdev;

-    if (!device || !dev_is_pci(device))
-        return 0;
+    if (!dev_is_pci(dev))
+        return false;

-    pci_dev = to_pci_dev(device);
+    pdev = to_pci_dev(dev);

-    if (pci_dev == vga_default_device())
-        return 1;
-    return 0;
+    return (pdev == vga_default_device());
  }
-EXPORT_SYMBOL(fb_is_primary_device);
+EXPORT_SYMBOL(video_is_primary_device);

  MODULE_LICENSE("GPL");

diff --git a/drivers/video/fbdev/core/fbcon.c 

b/drivers/video/fbdev/core/fbcon.c
index 46823c2e2ba12..85c5c8cbc680a 100644

--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c

@@ -2939,7 +2939,7 @@ void fbcon_remap_all(struct fb_info *info)

  static void fbcon_select_primary(struct fb_info *info)
  {
      if (!map_override && primary_device == -1 &&
-        fb_is_primary_device(info)) {
+        video_is_primary_device(info->device)) {
          int i;

          printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",

diff --git a/include/asm-generic/fb.h b/include/asm-generic/fb.h
index 6ccabb400aa66..4788c1e1c6bc0 100644
--- a/include/asm-generic/fb.h
+++ b/include/asm-generic/fb.h

@@ -10,8 +10,9 @@

  #include <linux/io.h>
  #include <linux/mm_types.h>
  #include <linux/pgtable.h>
+#include <linux/types.h>

-struct fb_info;
+struct device;

  #ifndef pgprot_framebuffer
  #define pgprot_framebuffer pgprot_framebuffer

@@ -23,11 +24,11 @@ static inline pgprot_t 

pgprot_framebuffer(pgprot_t prot,
  }
  #endif

-#ifndef fb_is_primary_device
-#define fb_is_primary_device fb_is_primary_device
-static inline int fb_is_primary_device(struct fb_info *info)
+#ifndef video_is_primary_device
+#define video_is_primary_device video_is_primary_device
+static inline bool video_is_primary_device(struct device *dev)
  {
-    return 0;
+    return false;
  }
  #endif

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)