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Message-ID: <9db306b2-b102-4bf5-a120-e1d279269fe9@suse.de>
Date: Thu, 28 Mar 2024 14:33:00 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Helge Deller <deller@....de>, arnd@...db.de, javierm@...hat.com,
sui.jingfeng@...ux.dev
Cc: linux-arch@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-fbdev@...r.kernel.org, sparclinux@...r.kernel.org,
linux-sh@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-parisc@...r.kernel.org, linux-mips@...r.kernel.org,
linux-m68k@...ts.linux-m68k.org, loongarch@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-snps-arc@...ts.infradead.org,
linux-kernel@...r.kernel.org,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
"David S. Miller" <davem@...emloft.net>,
Andreas Larsson <andreas@...sler.com>, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>
Subject: 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:
>> 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
>
>> is similar in functionality, but can operate on non-fbdev devices.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
>> Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
>> Cc: Helge Deller <deller@....de>
>> Cc: "David S. Miller" <davem@...emloft.net>
>> Cc: Andreas Larsson <andreas@...sler.com>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Borislav Petkov <bp@...en8.de>
>> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
>> Cc: x86@...nel.org
>> Cc: "H. Peter Anvin" <hpa@...or.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
>> <tsbogend@...ha.franken.de>
>> */
>>
>> -#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)
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