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Message-ID: <f2c40b22-04bf-e8f2-9839-36d6d26189a1@suse.de>
Date: Fri, 5 Nov 2021 10:00:49 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Javier Martinez Canillas <javierm@...hat.com>,
linux-kernel@...r.kernel.org
Cc: Michel Dänzer <michel@...nzer.net>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Peter Robinson <pbrobinson@...il.com>,
Pekka Paalanen <pekka.paalanen@...labora.com>,
Alex Deucher <alexander.deucher@....com>,
Ben Skeggs <bskeggs@...hat.com>, Chia-I Wu <olvaffe@...il.com>,
Christian König <christian.koenig@....com>,
Daniel Vetter <daniel@...ll.ch>,
Dave Airlie <airlied@...hat.com>,
David Airlie <airlied@...ux.ie>,
Gerd Hoffmann <kraxel@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Gurchetan Singh <gurchetansingh@...omium.org>,
Hans de Goede <hdegoede@...hat.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
VMware Graphics <linux-graphics-maintainer@...are.com>,
Zack Rusin <zackr@...are.com>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
linux-fbdev@...r.kernel.org, nouveau@...ts.freedesktop.org,
spice-devel@...ts.freedesktop.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 2/2] drm: Move nomodeset kernel parameter to the DRM
subsystem
Hi
Am 04.11.21 um 17:07 schrieb Javier Martinez Canillas:
> The "nomodeset" kernel cmdline parameter is handled by the vgacon driver
> but the exported vgacon_text_force() symbol is only used by DRM drivers.
>
> It makes much more sense for the parameter logic to be in the subsystem
> of the drivers that are making use of it.
>
> Let's move the vgacon_text_force() function and related logic to the DRM
> subsystem. While doing that, rename the function to drm_check_modeset()
> which better reflects what the function is really used to test for.
>
> Suggested-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
>
> Changes in v2:
> - Conditionally build drm_nomodeset.o if CONFIG_VGA_CONSOLE is set.
> - Squash patches to move nomodeset logic to DRM and do the renaming.
> - Name the function drm_check_modeset() and make it return -ENODEV.
>
> drivers/gpu/drm/Makefile | 2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 -
> drivers/gpu/drm/ast/ast_drv.c | 1 -
> drivers/gpu/drm/drm_drv.c | 9 +++++----
> drivers/gpu/drm/drm_nomodeset.c | 26 +++++++++++++++++++++++++
> drivers/gpu/drm/i915/i915_module.c | 2 --
> drivers/gpu/drm/mgag200/mgag200_drv.c | 1 -
> drivers/gpu/drm/nouveau/nouveau_drm.c | 1 -
> drivers/gpu/drm/qxl/qxl_drv.c | 1 -
> drivers/gpu/drm/radeon/radeon_drv.c | 1 -
> drivers/gpu/drm/tiny/bochs.c | 1 -
> drivers/gpu/drm/tiny/cirrus.c | 1 -
> drivers/gpu/drm/vboxvideo/vbox_drv.c | 1 -
> drivers/gpu/drm/virtio/virtgpu_drv.c | 1 -
> drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 1 -
> drivers/video/console/vgacon.c | 21 --------------------
> include/drm/drm_mode_config.h | 6 ++++++
> include/linux/console.h | 6 ------
> 18 files changed, 39 insertions(+), 44 deletions(-)
> create mode 100644 drivers/gpu/drm/drm_nomodeset.c
>
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 1c41156deb5f..c74810c285af 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -33,6 +33,8 @@ drm-$(CONFIG_DRM_PRIVACY_SCREEN) += drm_privacy_screen.o drm_privacy_screen_x86.
>
> obj-$(CONFIG_DRM_DP_AUX_BUS) += drm_dp_aux_bus.o
>
> +obj-$(CONFIG_VGA_CONSOLE) += drm_nomodeset.o
> +
This now depends on the VGA textmode console. Even if you have no VGA
console, you'd want drm_nomodeset.o. Simpledrm might be built-in and can
provide graphics. Non-PC systems don't even have a VGA device.
I think we really want a separate boolean config option that gets
selected by CONFIG_DRM.
> drm_cma_helper-y := drm_gem_cma_helper.o
> obj-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_cma_helper.o
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 7fde40d06181..b4b6993861e6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -31,7 +31,6 @@
> #include "amdgpu_drv.h"
>
> #include <drm/drm_pciids.h>
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pm_runtime.h>
> #include <linux/vga_switcheroo.h>
> diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
> index 802063279b86..6222082c3082 100644
> --- a/drivers/gpu/drm/ast/ast_drv.c
> +++ b/drivers/gpu/drm/ast/ast_drv.c
> @@ -26,7 +26,6 @@
> * Authors: Dave Airlie <airlied@...hat.com>
> */
>
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pci.h>
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 3fb567d62881..80b85b8ea776 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -986,12 +986,13 @@ EXPORT_SYMBOL(drm_dev_set_unique);
> */
> int drm_drv_enabled(const struct drm_driver *driver)
> {
> - if (vgacon_text_force()) {
> + int ret;
> +
> + ret = drm_check_modeset();
> + if (ret)
> DRM_INFO("%s driver is disabled\n", driver->name);
> - return -ENODEV;
> - }
>
> - return 0;
> + return ret;
> }
> EXPORT_SYMBOL(drm_drv_enabled);
>
> diff --git a/drivers/gpu/drm/drm_nomodeset.c b/drivers/gpu/drm/drm_nomodeset.c
> new file mode 100644
> index 000000000000..6683e396d2c5
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_nomodeset.c
> @@ -0,0 +1,26 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/module.h>
> +#include <linux/types.h>
> +
> +static bool drm_nomodeset;
> +
> +int drm_check_modeset(void)
> +{
> + return drm_nomodeset ? -ENODEV : 0;
> +}
> +EXPORT_SYMBOL(drm_check_modeset);
> +
> +static int __init disable_modeset(char *str)
> +{
> + drm_nomodeset = true;
> +
> + pr_warn("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
> + pr_warn("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
> + pr_warn("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
I'd update this text to be less sensational.
> +
> + return 1;
> +}
> +
> +/* Disable kernel modesetting */
> +__setup("nomodeset", disable_modeset);
> diff --git a/drivers/gpu/drm/i915/i915_module.c b/drivers/gpu/drm/i915/i915_module.c
> index 45cb3e540eff..c890c1ca20c4 100644
> --- a/drivers/gpu/drm/i915/i915_module.c
> +++ b/drivers/gpu/drm/i915/i915_module.c
> @@ -4,8 +4,6 @@
> * Copyright © 2021 Intel Corporation
> */
>
> -#include <linux/console.h>
> -
These changes should be in patch 1?
> #include "gem/i915_gem_context.h"
> #include "gem/i915_gem_object.h"
> #include "i915_active.h"
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
> index 2a581094ba2b..8e000cac11ba 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> @@ -6,7 +6,6 @@
> * Dave Airlie
> */
>
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> #include <linux/vmalloc.h>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index 8844d3602d87..bd1456521b7c 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -22,7 +22,6 @@
> * Authors: Ben Skeggs
> */
>
> -#include <linux/console.h>
> #include <linux/delay.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> index 3ac2ef2bf545..ff070ac76111 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.c
> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> @@ -29,7 +29,6 @@
>
> #include "qxl_drv.h"
>
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> #include <linux/vgaarb.h>
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 56d688c04346..f59cc971ec95 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -31,7 +31,6 @@
>
>
> #include <linux/compat.h>
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pm_runtime.h>
> #include <linux/vga_switcheroo.h>
> diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
> index ee6b1ff9128b..6e9a31f1a0f3 100644
> --- a/drivers/gpu/drm/tiny/bochs.c
> +++ b/drivers/gpu/drm/tiny/bochs.c
> @@ -1,6 +1,5 @@
> // SPDX-License-Identifier: GPL-2.0-or-later
>
> -#include <linux/console.h>
> #include <linux/pci.h>
>
> #include <drm/drm_aperture.h>
> diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
> index 4706c5bc3067..659208d5aef9 100644
> --- a/drivers/gpu/drm/tiny/cirrus.c
> +++ b/drivers/gpu/drm/tiny/cirrus.c
> @@ -16,7 +16,6 @@
> * Copyright 1999-2001 Jeff Garzik <jgarzik@...ox.com>
> */
>
> -#include <linux/console.h>
> #include <linux/dma-buf-map.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.c b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> index e4377c37cf33..b1e63fd543bb 100644
> --- a/drivers/gpu/drm/vboxvideo/vbox_drv.c
> +++ b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> @@ -7,7 +7,6 @@
> * Michael Thayer <michael.thayer@...cle.com,
> * Hans de Goede <hdegoede@...hat.com>
> */
> -#include <linux/console.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> #include <linux/vt_kern.h>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
> index 28200dfba2d1..ba9c0c2f8ae6 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
> @@ -27,7 +27,6 @@
> */
>
> #include <linux/module.h>
> -#include <linux/console.h>
> #include <linux/pci.h>
> #include <linux/poll.h>
> #include <linux/wait.h>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index 05e9949293d5..115ec9518277 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -25,7 +25,6 @@
> *
> **************************************************************************/
>
> -#include <linux/console.h>
> #include <linux/dma-mapping.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
> index ef9c57ce0906..d4320b147956 100644
> --- a/drivers/video/console/vgacon.c
> +++ b/drivers/video/console/vgacon.c
> @@ -97,30 +97,9 @@ static int vga_video_font_height;
> static int vga_scan_lines __read_mostly;
> static unsigned int vga_rolled_over; /* last vc_origin offset before wrap */
>
> -static bool vgacon_text_mode_force;
> static bool vga_hardscroll_enabled;
> static bool vga_hardscroll_user_enable = true;
>
> -bool vgacon_text_force(void)
> -{
> - return vgacon_text_mode_force;
> -}
> -EXPORT_SYMBOL(vgacon_text_force);
> -
> -static int __init text_mode(char *str)
> -{
> - vgacon_text_mode_force = true;
> -
> - pr_warn("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
> - pr_warn("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
> - pr_warn("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
> -
> - return 1;
> -}
> -
> -/* force text mode - used by kernel modesetting */
> -__setup("nomodeset", text_mode);
> -
> static int __init no_scroll(char *str)
> {
> /*
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 48b7de80daf5..18982d3507e4 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -969,4 +969,10 @@ static inline int drm_mode_config_init(struct drm_device *dev)
> void drm_mode_config_reset(struct drm_device *dev);
> void drm_mode_config_cleanup(struct drm_device *dev);
>
> +#ifdef CONFIG_VGA_CONSOLE
> +extern int drm_check_modeset(void);
> +#else
> +static inline int drm_check_modeset(void) { return 0; }
> +#endif
> +
> #endif
> diff --git a/include/linux/console.h b/include/linux/console.h
> index 20874db50bc8..d4dd8384898b 100644
> --- a/include/linux/console.h
> +++ b/include/linux/console.h
> @@ -217,12 +217,6 @@ extern atomic_t ignore_console_lock_warning;
> #define VESA_HSYNC_SUSPEND 2
> #define VESA_POWERDOWN 3
>
> -#ifdef CONFIG_VGA_CONSOLE
> -extern bool vgacon_text_force(void);
> -#else
> -static inline bool vgacon_text_force(void) { return false; }
> -#endif
> -
> extern void console_init(void);
>
> /* For deferred console takeover */
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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