[PATCH 0/5] Cleanups for the nomodeset kernel command line parameter logic

[PATCH 0/5] Cleanups for the nomodeset kernel command line parameter logic

[Javier Martinez Canillas]

There is a lot of historical baggage on this parameter. It's defined in
the vgacon driver as a "nomodeset" parameter, but it's handler function is
called text_mode() that sets a variable named vgacon_text_mode_force whose
value is queried with a function named vgacon_text_force().

All this implies that it's about forcing text mode for VGA, yet it is not
used in neither vgacon nor other console driver. The only users for these
are DRM drivers, that check for the vgacon_text_force() return value to
determine whether the driver could be loaded or not.

That makes it quite confusing to read the code, because the variables and
function names don't reflect what they actually do and also are not in the
same subsystem as the drivers that make use of them.

This patch-set attempts to cleanup the code by moving the nomodseset param
to the DRM subsystem and do some renaming to make their intention clearer.

There is also another aspect that could be improved, and is the fact that
drivers are checking for the nomodeset being set as an indication if have
to be loaded.

But there may be other reasons why this could be the case, so it is better
to encapsulate the logic in a separate function to make clear what's about.

Patch #1 is just a trivial fix for a comment that isn't referring to the
correct kernel parameter.

Patch #2 moves the nomodeset logic to the DRM subsystem.

Patch #3 renames the vgacon_text_force() function and accompaning logic as
drm_modeset_disabled(), which is what this function is really about.

Patch #4 adds a drm_drv_enabled() function that could be used by drivers
to check if could be enabled.

Patch #5 uses the drm_drv_enabled() function to check this instead of just
checking if nomodeset has been set.


Javier Martinez Canillas (5):
  drm/i915: Fix comment about modeset parameters
  drm: Move nomodeset kernel parameter handler to the DRM subsystem
  drm: Rename vgacon_text_force() function to drm_modeset_disabled()
  drm: Add a drm_drv_enabled() helper function
  drm: Use drm_drv_enabled() instead of drm_modeset_disabled()

 drivers/gpu/drm/Makefile                |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  5 ++---
 drivers/gpu/drm/ast/ast_drv.c           |  3 +--
 drivers/gpu/drm/drm_drv.c               | 21 ++++++++++++++++++++
 drivers/gpu/drm/drm_nomodeset.c         | 26 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_module.c      | 10 +++++-----
 drivers/gpu/drm/mgag200/mgag200_drv.c   |  3 +--
 drivers/gpu/drm/nouveau/nouveau_drm.c   |  3 +--
 drivers/gpu/drm/qxl/qxl_drv.c           |  3 +--
 drivers/gpu/drm/radeon/radeon_drv.c     |  3 +--
 drivers/gpu/drm/tiny/bochs.c            |  3 +--
 drivers/gpu/drm/tiny/cirrus.c           |  3 +--
 drivers/gpu/drm/vboxvideo/vbox_drv.c    |  5 +----
 drivers/gpu/drm/virtio/virtgpu_drv.c    |  3 +--
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c     |  3 +--
 drivers/video/console/vgacon.c          | 21 --------------------
 include/drm/drm_drv.h                   |  1 +
 include/drm/drm_mode_config.h           |  6 ++++++
 include/linux/console.h                 |  6 ------
 19 files changed, 73 insertions(+), 57 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_nomodeset.c

-- 
2.33.1

[PATCH 1/5] drm/i915: Fix comment about modeset parameters

[Javier Martinez Canillas]

The comment mentions that the KMS is enabled by default unless either the
i915.modeset module parameter or vga_text_mode_force boot option are used.

But the latter does not exist and instead the nomodeset option was meant.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 drivers/gpu/drm/i915/i915_module.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git drivers/gpu/drm/i915/i915_module.c drivers/gpu/drm/i915/i915_module.c
index ab2295dd4500..c7507266aa83 100644
--- drivers/gpu/drm/i915/i915_module.c
+++ drivers/gpu/drm/i915/i915_module.c
@@ -24,8 +24,8 @@ static int i915_check_nomodeset(void)
 
 	/*
 	 * Enable KMS by default, unless explicitly overriden by
-	 * either the i915.modeset prarameter or by the
-	 * vga_text_mode_force boot option.
+	 * either the i915.modeset parameter or by the
+	 * nomodeset boot option.
 	 */
 
 	if (i915_modparams.modeset == 0)
-- 
2.33.1

[PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[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 that to DRM.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 drivers/gpu/drm/Makefile                |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  3 +--
 drivers/gpu/drm/ast/ast_drv.c           |  1 -
 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 ------
 17 files changed, 35 insertions(+), 41 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_nomodeset.c

diff --git drivers/gpu/drm/Makefile drivers/gpu/drm/Makefile
index 1c41156deb5f..0e2d60ea93ca 100644
--- drivers/gpu/drm/Makefile
+++ 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-y += drm_nomodeset.o
+
 drm_cma_helper-y := drm_gem_cma_helper.o
 obj-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_cma_helper.o
 
diff --git drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index c718fb5f3f8a..2680a2aaa877 100644
--- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ 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>
@@ -2515,7 +2514,7 @@ static int __init amdgpu_init(void)
 	int r;
 
 	if (vgacon_text_force()) {
-		DRM_ERROR("VGACON disables amdgpu kernel modesetting.\n");
+		DRM_ERROR("amdgpu kernel modesetting disabled.\n");
 		return -EINVAL;
 	}
 
diff --git drivers/gpu/drm/ast/ast_drv.c drivers/gpu/drm/ast/ast_drv.c
index 86d5cd7b6318..048be607b182 100644
--- drivers/gpu/drm/ast/ast_drv.c
+++ drivers/gpu/drm/ast/ast_drv.c
@@ -26,7 +26,6 @@
  * Authors: Dave Airlie <airlied@redhat.com>
  */
 
-#include <linux/console.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 
diff --git drivers/gpu/drm/drm_nomodeset.c drivers/gpu/drm/drm_nomodeset.c
new file mode 100644
index 000000000000..1ac9a8d5a8fe
--- /dev/null
+++ 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 vgacon_text_mode_force;
+
+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);
diff --git drivers/gpu/drm/i915/i915_module.c drivers/gpu/drm/i915/i915_module.c
index c7507266aa83..14a59226519d 100644
--- drivers/gpu/drm/i915/i915_module.c
+++ drivers/gpu/drm/i915/i915_module.c
@@ -4,8 +4,6 @@
  * Copyright © 2021 Intel Corporation
  */
 
-#include <linux/console.h>
-
 #include "gem/i915_gem_context.h"
 #include "gem/i915_gem_object.h"
 #include "i915_active.h"
diff --git drivers/gpu/drm/mgag200/mgag200_drv.c drivers/gpu/drm/mgag200/mgag200_drv.c
index 6b9243713b3c..685e766db6a4 100644
--- drivers/gpu/drm/mgag200/mgag200_drv.c
+++ 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 drivers/gpu/drm/nouveau/nouveau_drm.c drivers/gpu/drm/nouveau/nouveau_drm.c
index 1f828c9f691c..029997f50d1a 100644
--- drivers/gpu/drm/nouveau/nouveau_drm.c
+++ 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 drivers/gpu/drm/qxl/qxl_drv.c drivers/gpu/drm/qxl/qxl_drv.c
index fc47b0deb021..3cd6bd9f059d 100644
--- drivers/gpu/drm/qxl/qxl_drv.c
+++ 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 drivers/gpu/drm/radeon/radeon_drv.c drivers/gpu/drm/radeon/radeon_drv.c
index b74cebca1f89..9b606c1b11ec 100644
--- drivers/gpu/drm/radeon/radeon_drv.c
+++ 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 drivers/gpu/drm/tiny/bochs.c drivers/gpu/drm/tiny/bochs.c
index 2ce3bd903b70..04333f78be55 100644
--- drivers/gpu/drm/tiny/bochs.c
+++ 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 drivers/gpu/drm/tiny/cirrus.c drivers/gpu/drm/tiny/cirrus.c
index 4611ec408506..8bd674f0d682 100644
--- drivers/gpu/drm/tiny/cirrus.c
+++ drivers/gpu/drm/tiny/cirrus.c
@@ -16,7 +16,6 @@
  * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
  */
 
-#include <linux/console.h>
 #include <linux/dma-buf-map.h>
 #include <linux/module.h>
 #include <linux/pci.h>
diff --git drivers/gpu/drm/vboxvideo/vbox_drv.c drivers/gpu/drm/vboxvideo/vbox_drv.c
index a6c81af37345..e6d983121d0b 100644
--- drivers/gpu/drm/vboxvideo/vbox_drv.c
+++ drivers/gpu/drm/vboxvideo/vbox_drv.c
@@ -7,7 +7,6 @@
  *          Michael Thayer <michael.thayer@oracle.com,
  *          Hans de Goede <hdegoede@redhat.com>
  */
-#include <linux/console.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/vt_kern.h>
diff --git drivers/gpu/drm/virtio/virtgpu_drv.c drivers/gpu/drm/virtio/virtgpu_drv.c
index 749db18dcfa2..cd4c170236f1 100644
--- drivers/gpu/drm/virtio/virtgpu_drv.c
+++ 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 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index ab9a1750e1df..fcc4b5a7f639 100644
--- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ 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 drivers/video/console/vgacon.c drivers/video/console/vgacon.c
index ef9c57ce0906..d4320b147956 100644
--- drivers/video/console/vgacon.c
+++ 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 include/drm/drm_mode_config.h include/drm/drm_mode_config.h
index 48b7de80daf5..e1d2042a7b77 100644
--- include/drm/drm_mode_config.h
+++ 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 bool vgacon_text_force(void);
+#else
+static inline bool vgacon_text_force(void) { return false; }
+#endif
+
 #endif
diff --git include/linux/console.h include/linux/console.h
index 20874db50bc8..d4dd8384898b 100644
--- include/linux/console.h
+++ 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 */
-- 
2.33.1

[PATCH 3/5] drm: Rename vgacon_text_force() function to drm_modeset_disabled()

[Javier Martinez Canillas]

This function is used by some DRM drivers to determine if the "nomodeset"
kernel command line parameter was set and prevent these drivers to probe.

But the function name is quite confusing and does not reflect what really
the drivers are testing when calling it. Use a better naming now that it
is part of the DRM subsystem.

Also, vgacon_text_force() is guarded by #ifdef CONFIG_VGA_CONSOLE already
so there is no need to do the same when calling the function.

Suggested-by: Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  2 +-
 drivers/gpu/drm/ast/ast_drv.c           |  2 +-
 drivers/gpu/drm/drm_nomodeset.c         | 16 ++++++++--------
 drivers/gpu/drm/i915/i915_module.c      |  2 +-
 drivers/gpu/drm/mgag200/mgag200_drv.c   |  2 +-
 drivers/gpu/drm/nouveau/nouveau_drm.c   |  2 +-
 drivers/gpu/drm/qxl/qxl_drv.c           |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c     |  2 +-
 drivers/gpu/drm/tiny/bochs.c            |  2 +-
 drivers/gpu/drm/tiny/cirrus.c           |  2 +-
 drivers/gpu/drm/vboxvideo/vbox_drv.c    |  4 +---
 drivers/gpu/drm/virtio/virtgpu_drv.c    |  2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c     |  2 +-
 include/drm/drm_mode_config.h           |  4 ++--
 14 files changed, 22 insertions(+), 24 deletions(-)

diff --git drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 2680a2aaa877..f7bd2616cf23 100644
--- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2513,7 +2513,7 @@ static int __init amdgpu_init(void)
 {
 	int r;
 
-	if (vgacon_text_force()) {
+	if (drm_modeset_disabled()) {
 		DRM_ERROR("amdgpu kernel modesetting disabled.\n");
 		return -EINVAL;
 	}
diff --git drivers/gpu/drm/ast/ast_drv.c drivers/gpu/drm/ast/ast_drv.c
index 048be607b182..6706050414c3 100644
--- drivers/gpu/drm/ast/ast_drv.c
+++ drivers/gpu/drm/ast/ast_drv.c
@@ -232,7 +232,7 @@ static struct pci_driver ast_pci_driver = {
 
 static int __init ast_init(void)
 {
-	if (vgacon_text_force() && ast_modeset == -1)
+	if (drm_modeset_disabled() && ast_modeset == -1)
 		return -EINVAL;
 
 	if (ast_modeset == 0)
diff --git drivers/gpu/drm/drm_nomodeset.c drivers/gpu/drm/drm_nomodeset.c
index 1ac9a8d5a8fe..dfc8b30f0625 100644
--- drivers/gpu/drm/drm_nomodeset.c
+++ drivers/gpu/drm/drm_nomodeset.c
@@ -3,17 +3,17 @@
 #include <linux/module.h>
 #include <linux/types.h>
 
-static bool vgacon_text_mode_force;
+static bool drm_nomodeset;
 
-bool vgacon_text_force(void)
+bool drm_modeset_disabled(void)
 {
-	return vgacon_text_mode_force;
+	return drm_nomodeset;
 }
-EXPORT_SYMBOL(vgacon_text_force);
+EXPORT_SYMBOL(drm_modeset_disabled);
 
-static int __init text_mode(char *str)
+static int __init disable_modeset(char *str)
 {
-	vgacon_text_mode_force = true;
+	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");
@@ -22,5 +22,5 @@ static int __init text_mode(char *str)
 	return 1;
 }
 
-/* force text mode - used by kernel modesetting */
-__setup("nomodeset", text_mode);
+/* Disable kernel modesetting */
+__setup("nomodeset", disable_modeset);
diff --git drivers/gpu/drm/i915/i915_module.c drivers/gpu/drm/i915/i915_module.c
index 14a59226519d..3e5531040e4d 100644
--- drivers/gpu/drm/i915/i915_module.c
+++ drivers/gpu/drm/i915/i915_module.c
@@ -29,7 +29,7 @@ static int i915_check_nomodeset(void)
 	if (i915_modparams.modeset == 0)
 		use_kms = false;
 
-	if (vgacon_text_force() && i915_modparams.modeset == -1)
+	if (drm_modeset_disabled() && i915_modparams.modeset == -1)
 		use_kms = false;
 
 	if (!use_kms) {
diff --git drivers/gpu/drm/mgag200/mgag200_drv.c drivers/gpu/drm/mgag200/mgag200_drv.c
index 685e766db6a4..7ee87564bade 100644
--- drivers/gpu/drm/mgag200/mgag200_drv.c
+++ drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -377,7 +377,7 @@ static struct pci_driver mgag200_pci_driver = {
 
 static int __init mgag200_init(void)
 {
-	if (vgacon_text_force() && mgag200_modeset == -1)
+	if (drm_modeset_disabled() && mgag200_modeset == -1)
 		return -EINVAL;
 
 	if (mgag200_modeset == 0)
diff --git drivers/gpu/drm/nouveau/nouveau_drm.c drivers/gpu/drm/nouveau/nouveau_drm.c
index 029997f50d1a..903d0e626954 100644
--- drivers/gpu/drm/nouveau/nouveau_drm.c
+++ drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1321,7 +1321,7 @@ nouveau_drm_init(void)
 	nouveau_display_options();
 
 	if (nouveau_modeset == -1) {
-		if (vgacon_text_force())
+		if (drm_modeset_disabled())
 			nouveau_modeset = 0;
 	}
 
diff --git drivers/gpu/drm/qxl/qxl_drv.c drivers/gpu/drm/qxl/qxl_drv.c
index 3cd6bd9f059d..e4ab16837fad 100644
--- drivers/gpu/drm/qxl/qxl_drv.c
+++ drivers/gpu/drm/qxl/qxl_drv.c
@@ -294,7 +294,7 @@ static struct drm_driver qxl_driver = {
 
 static int __init qxl_init(void)
 {
-	if (vgacon_text_force() && qxl_modeset == -1)
+	if (drm_modeset_disabled() && qxl_modeset == -1)
 		return -EINVAL;
 
 	if (qxl_modeset == 0)
diff --git drivers/gpu/drm/radeon/radeon_drv.c drivers/gpu/drm/radeon/radeon_drv.c
index 9b606c1b11ec..36c8dac68cca 100644
--- drivers/gpu/drm/radeon/radeon_drv.c
+++ drivers/gpu/drm/radeon/radeon_drv.c
@@ -636,7 +636,7 @@ static struct pci_driver radeon_kms_pci_driver = {
 
 static int __init radeon_module_init(void)
 {
-	if (vgacon_text_force() && radeon_modeset == -1) {
+	if (drm_modeset_disabled() && radeon_modeset == -1) {
 		DRM_INFO("VGACON disable radeon kernel modesetting.\n");
 		radeon_modeset = 0;
 	}
diff --git drivers/gpu/drm/tiny/bochs.c drivers/gpu/drm/tiny/bochs.c
index 04333f78be55..59189f7c1840 100644
--- drivers/gpu/drm/tiny/bochs.c
+++ drivers/gpu/drm/tiny/bochs.c
@@ -718,7 +718,7 @@ static struct pci_driver bochs_pci_driver = {
 
 static int __init bochs_init(void)
 {
-	if (vgacon_text_force() && bochs_modeset == -1)
+	if (drm_modeset_disabled() && bochs_modeset == -1)
 		return -EINVAL;
 
 	if (bochs_modeset == 0)
diff --git drivers/gpu/drm/tiny/cirrus.c drivers/gpu/drm/tiny/cirrus.c
index 8bd674f0d682..fcf98379c641 100644
--- drivers/gpu/drm/tiny/cirrus.c
+++ drivers/gpu/drm/tiny/cirrus.c
@@ -635,7 +635,7 @@ static struct pci_driver cirrus_pci_driver = {
 
 static int __init cirrus_init(void)
 {
-	if (vgacon_text_force())
+	if (drm_modeset_disabled())
 		return -EINVAL;
 	return pci_register_driver(&cirrus_pci_driver);
 }
diff --git drivers/gpu/drm/vboxvideo/vbox_drv.c drivers/gpu/drm/vboxvideo/vbox_drv.c
index e6d983121d0b..09356dbd69b2 100644
--- drivers/gpu/drm/vboxvideo/vbox_drv.c
+++ drivers/gpu/drm/vboxvideo/vbox_drv.c
@@ -192,10 +192,8 @@ static const struct drm_driver driver = {
 
 static int __init vbox_init(void)
 {
-#ifdef CONFIG_VGA_CONSOLE
-	if (vgacon_text_force() && vbox_modeset == -1)
+	if (drm_modeset_disabled() && vbox_modeset == -1)
 		return -EINVAL;
-#endif
 
 	if (vbox_modeset == 0)
 		return -EINVAL;
diff --git drivers/gpu/drm/virtio/virtgpu_drv.c drivers/gpu/drm/virtio/virtgpu_drv.c
index cd4c170236f1..d96797d70fae 100644
--- drivers/gpu/drm/virtio/virtgpu_drv.c
+++ drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -103,7 +103,7 @@ static int virtio_gpu_probe(struct virtio_device *vdev)
 	struct drm_device *dev;
 	int ret;
 
-	if (vgacon_text_force() && virtio_gpu_modeset == -1)
+	if (drm_modeset_disabled() && virtio_gpu_modeset == -1)
 		return -EINVAL;
 
 	if (virtio_gpu_modeset == 0)
diff --git drivers/gpu/drm/vmwgfx/vmwgfx_drv.c drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index fcc4b5a7f639..22dab9beea03 100644
--- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1650,7 +1650,7 @@ static int __init vmwgfx_init(void)
 {
 	int ret;
 
-	if (vgacon_text_force())
+	if (drm_modeset_disabled())
 		return -EINVAL;
 
 	ret = pci_register_driver(&vmw_pci_driver);
diff --git include/drm/drm_mode_config.h include/drm/drm_mode_config.h
index e1d2042a7b77..a5a2dc02e892 100644
--- include/drm/drm_mode_config.h
+++ include/drm/drm_mode_config.h
@@ -970,9 +970,9 @@ void drm_mode_config_reset(struct drm_device *dev);
 void drm_mode_config_cleanup(struct drm_device *dev);
 
 #ifdef CONFIG_VGA_CONSOLE
-extern bool vgacon_text_force(void);
+extern bool drm_modeset_disabled(void);
 #else
-static inline bool vgacon_text_force(void) { return false; }
+static inline bool drm_modeset_disabled(void) { return false; }
 #endif
 
 #endif
-- 
2.33.1

Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Neal Gompa]

On Wed, Nov 3, 2021 at 6:48 AM Javier Martinez Canillas
<javierm@redhat.com> wrote:
>
> 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 that to DRM.
>
> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> ---

Please no, I'd much rather have a better, more meaningful option
instead of "nomodeset". If anything, I would like this option to
eventually do nothing and replace it with a better named option that's
namespaced by drm on the command-line. That was part of the feedback I
gave in the original patch set, and I still stand by that.


-- 
真実はいつも一つ！/ Always, there's only one truth!

Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Javier Martinez Canillas]

Hello Neal,

On 11/3/21 12:05, Neal Gompa wrote:
> On Wed, Nov 3, 2021 at 6:48 AM Javier Martinez Canillas
> <javierm@redhat.com> wrote:
>>
>> 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 that to DRM.
>>
>> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>> ---
> 
> Please no, I'd much rather have a better, more meaningful option
> instead of "nomodeset". If anything, I would like this option to
> eventually do nothing and replace it with a better named option that's
> namespaced by drm on the command-line. That was part of the feedback I
> gave in the original patch set, and I still stand by that.
> 

I do agree with you that a more meaningful parameter would be desirable.

But I think that's orthogonal to this series and something that could be
done as a follow-up. That is, nomodeset isn't going away anytime soon as
that's what users are get to.

This doesn't mean that a drm.disable_native_drivers, drm.safe_mode or
whatever could be added. Internally it would also toggle the same value
but it will be much more clear to users what's the expected behaviour.

By having a module parameter under the drm namespace, it would also allow
to change this from user-space through a sysfs entry. Something that's not
currently possible for the "nomodeset" paramter.

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat

Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Thomas Zimmermann]

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Hi

Am 03.11.21 um 12:05 schrieb Neal Gompa:
> On Wed, Nov 3, 2021 at 6:48 AM Javier Martinez Canillas
> <javierm@redhat.com> wrote:
>>
>> 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 that to DRM.
>>
>> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>> ---
> 
> Please no, I'd much rather have a better, more meaningful option
> instead of "nomodeset". If anything, I would like this option to
> eventually do nothing and replace it with a better named option that's
> namespaced by drm on the command-line. That was part of the feedback I
> gave in the original patch set, and I still stand by that.

This was nack'ed for now during irc chats with others. There was no 
clear semantics for the new parameter and nomodeset is good enough for 
now. I agree that nomodeset is badly named, though.

Best regards
Thomas

> 
> 

-- 
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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Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Neal Gompa]

On Wed, Nov 3, 2021 at 8:32 AM Thomas Zimmermann <tzimmermann@suse.de> wrote:
>
> Hi
>
> Am 03.11.21 um 12:05 schrieb Neal Gompa:
> > On Wed, Nov 3, 2021 at 6:48 AM Javier Martinez Canillas
> > <javierm@redhat.com> wrote:
> >>
> >> 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 that to DRM.
> >>
> >> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> >> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> >> ---
> >
> > Please no, I'd much rather have a better, more meaningful option
> > instead of "nomodeset". If anything, I would like this option to
> > eventually do nothing and replace it with a better named option that's
> > namespaced by drm on the command-line. That was part of the feedback I
> > gave in the original patch set, and I still stand by that.
>
> This was nack'ed for now during irc chats with others. There was no
> clear semantics for the new parameter and nomodeset is good enough for
> now. I agree that nomodeset is badly named, though.
>

Where are these chats happening? I'm mostly talking to Javier in the
#devel:fedoraproject.org Matrix room, so I don't know about anything
else...



-- 
真実はいつも一つ！/ Always, there's only one truth!

Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Thomas Zimmermann]

[-- Attachment #1.1: Type: text/plain, Size: 11089 bytes --]

Hi

Am 03.11.21 um 11:48 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 that to DRM.
> 
> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> ---
> 
>   drivers/gpu/drm/Makefile                |  2 ++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  3 +--
>   drivers/gpu/drm/ast/ast_drv.c           |  1 -
>   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 ------
>   17 files changed, 35 insertions(+), 41 deletions(-)
>   create mode 100644 drivers/gpu/drm/drm_nomodeset.c
> 
> diff --git drivers/gpu/drm/Makefile drivers/gpu/drm/Makefile
> index 1c41156deb5f..0e2d60ea93ca 100644
> --- drivers/gpu/drm/Makefile
> +++ 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-y += drm_nomodeset.o
> +

Is this linked unconditionally?

Would it make sense to have a config define for this and have CONFIG_DRM 
select it?

Best regards
Thomas

>   drm_cma_helper-y := drm_gem_cma_helper.o
>   obj-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_cma_helper.o
>   
> diff --git drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index c718fb5f3f8a..2680a2aaa877 100644
> --- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ 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>
> @@ -2515,7 +2514,7 @@ static int __init amdgpu_init(void)
>   	int r;
>   
>   	if (vgacon_text_force()) {
> -		DRM_ERROR("VGACON disables amdgpu kernel modesetting.\n");
> +		DRM_ERROR("amdgpu kernel modesetting disabled.\n");
>   		return -EINVAL;
>   	}
>   
> diff --git drivers/gpu/drm/ast/ast_drv.c drivers/gpu/drm/ast/ast_drv.c
> index 86d5cd7b6318..048be607b182 100644
> --- drivers/gpu/drm/ast/ast_drv.c
> +++ drivers/gpu/drm/ast/ast_drv.c
> @@ -26,7 +26,6 @@
>    * Authors: Dave Airlie <airlied@redhat.com>
>    */
>   
> -#include <linux/console.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
>   
> diff --git drivers/gpu/drm/drm_nomodeset.c drivers/gpu/drm/drm_nomodeset.c
> new file mode 100644
> index 000000000000..1ac9a8d5a8fe
> --- /dev/null
> +++ 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 vgacon_text_mode_force;
> +
> +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);
> diff --git drivers/gpu/drm/i915/i915_module.c drivers/gpu/drm/i915/i915_module.c
> index c7507266aa83..14a59226519d 100644
> --- drivers/gpu/drm/i915/i915_module.c
> +++ drivers/gpu/drm/i915/i915_module.c
> @@ -4,8 +4,6 @@
>    * Copyright © 2021 Intel Corporation
>    */
>   
> -#include <linux/console.h>
> -
>   #include "gem/i915_gem_context.h"
>   #include "gem/i915_gem_object.h"
>   #include "i915_active.h"
> diff --git drivers/gpu/drm/mgag200/mgag200_drv.c drivers/gpu/drm/mgag200/mgag200_drv.c
> index 6b9243713b3c..685e766db6a4 100644
> --- drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ 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 drivers/gpu/drm/nouveau/nouveau_drm.c drivers/gpu/drm/nouveau/nouveau_drm.c
> index 1f828c9f691c..029997f50d1a 100644
> --- drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ 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 drivers/gpu/drm/qxl/qxl_drv.c drivers/gpu/drm/qxl/qxl_drv.c
> index fc47b0deb021..3cd6bd9f059d 100644
> --- drivers/gpu/drm/qxl/qxl_drv.c
> +++ 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 drivers/gpu/drm/radeon/radeon_drv.c drivers/gpu/drm/radeon/radeon_drv.c
> index b74cebca1f89..9b606c1b11ec 100644
> --- drivers/gpu/drm/radeon/radeon_drv.c
> +++ 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 drivers/gpu/drm/tiny/bochs.c drivers/gpu/drm/tiny/bochs.c
> index 2ce3bd903b70..04333f78be55 100644
> --- drivers/gpu/drm/tiny/bochs.c
> +++ 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 drivers/gpu/drm/tiny/cirrus.c drivers/gpu/drm/tiny/cirrus.c
> index 4611ec408506..8bd674f0d682 100644
> --- drivers/gpu/drm/tiny/cirrus.c
> +++ drivers/gpu/drm/tiny/cirrus.c
> @@ -16,7 +16,6 @@
>    * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
>    */
>   
> -#include <linux/console.h>
>   #include <linux/dma-buf-map.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
> diff --git drivers/gpu/drm/vboxvideo/vbox_drv.c drivers/gpu/drm/vboxvideo/vbox_drv.c
> index a6c81af37345..e6d983121d0b 100644
> --- drivers/gpu/drm/vboxvideo/vbox_drv.c
> +++ drivers/gpu/drm/vboxvideo/vbox_drv.c
> @@ -7,7 +7,6 @@
>    *          Michael Thayer <michael.thayer@oracle.com,
>    *          Hans de Goede <hdegoede@redhat.com>
>    */
> -#include <linux/console.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
>   #include <linux/vt_kern.h>
> diff --git drivers/gpu/drm/virtio/virtgpu_drv.c drivers/gpu/drm/virtio/virtgpu_drv.c
> index 749db18dcfa2..cd4c170236f1 100644
> --- drivers/gpu/drm/virtio/virtgpu_drv.c
> +++ 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 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index ab9a1750e1df..fcc4b5a7f639 100644
> --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ 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 drivers/video/console/vgacon.c drivers/video/console/vgacon.c
> index ef9c57ce0906..d4320b147956 100644
> --- drivers/video/console/vgacon.c
> +++ 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 include/drm/drm_mode_config.h include/drm/drm_mode_config.h
> index 48b7de80daf5..e1d2042a7b77 100644
> --- include/drm/drm_mode_config.h
> +++ 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 bool vgacon_text_force(void);
> +#else
> +static inline bool vgacon_text_force(void) { return false; }
> +#endif
> +
>   #endif
> diff --git include/linux/console.h include/linux/console.h
> index 20874db50bc8..d4dd8384898b 100644
> --- include/linux/console.h
> +++ 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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Re: [PATCH 0/5] Cleanups for the nomodeset kernel command line parameter logic

[Thomas Zimmermann]

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Hi,

dri-devel is missing. Please resubmit with dri-devel in cc.

Best regards
Thomas

Am 03.11.21 um 11:48 schrieb Javier Martinez Canillas:
> There is a lot of historical baggage on this parameter. It's defined in
> the vgacon driver as a "nomodeset" parameter, but it's handler function is
> called text_mode() that sets a variable named vgacon_text_mode_force whose
> value is queried with a function named vgacon_text_force().
> 
> All this implies that it's about forcing text mode for VGA, yet it is not
> used in neither vgacon nor other console driver. The only users for these
> are DRM drivers, that check for the vgacon_text_force() return value to
> determine whether the driver could be loaded or not.
> 
> That makes it quite confusing to read the code, because the variables and
> function names don't reflect what they actually do and also are not in the
> same subsystem as the drivers that make use of them.
> 
> This patch-set attempts to cleanup the code by moving the nomodseset param
> to the DRM subsystem and do some renaming to make their intention clearer.
> 
> There is also another aspect that could be improved, and is the fact that
> drivers are checking for the nomodeset being set as an indication if have
> to be loaded.
> 
> But there may be other reasons why this could be the case, so it is better
> to encapsulate the logic in a separate function to make clear what's about.
> 
> Patch #1 is just a trivial fix for a comment that isn't referring to the
> correct kernel parameter.
> 
> Patch #2 moves the nomodeset logic to the DRM subsystem.
> 
> Patch #3 renames the vgacon_text_force() function and accompaning logic as
> drm_modeset_disabled(), which is what this function is really about.
> 
> Patch #4 adds a drm_drv_enabled() function that could be used by drivers
> to check if could be enabled.
> 
> Patch #5 uses the drm_drv_enabled() function to check this instead of just
> checking if nomodeset has been set.
> 
> 
> Javier Martinez Canillas (5):
>    drm/i915: Fix comment about modeset parameters
>    drm: Move nomodeset kernel parameter handler to the DRM subsystem
>    drm: Rename vgacon_text_force() function to drm_modeset_disabled()
>    drm: Add a drm_drv_enabled() helper function
>    drm: Use drm_drv_enabled() instead of drm_modeset_disabled()
> 
>   drivers/gpu/drm/Makefile                |  2 ++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  5 ++---
>   drivers/gpu/drm/ast/ast_drv.c           |  3 +--
>   drivers/gpu/drm/drm_drv.c               | 21 ++++++++++++++++++++
>   drivers/gpu/drm/drm_nomodeset.c         | 26 +++++++++++++++++++++++++
>   drivers/gpu/drm/i915/i915_module.c      | 10 +++++-----
>   drivers/gpu/drm/mgag200/mgag200_drv.c   |  3 +--
>   drivers/gpu/drm/nouveau/nouveau_drm.c   |  3 +--
>   drivers/gpu/drm/qxl/qxl_drv.c           |  3 +--
>   drivers/gpu/drm/radeon/radeon_drv.c     |  3 +--
>   drivers/gpu/drm/tiny/bochs.c            |  3 +--
>   drivers/gpu/drm/tiny/cirrus.c           |  3 +--
>   drivers/gpu/drm/vboxvideo/vbox_drv.c    |  5 +----
>   drivers/gpu/drm/virtio/virtgpu_drv.c    |  3 +--
>   drivers/gpu/drm/vmwgfx/vmwgfx_drv.c     |  3 +--
>   drivers/video/console/vgacon.c          | 21 --------------------
>   include/drm/drm_drv.h                   |  1 +
>   include/drm/drm_mode_config.h           |  6 ++++++
>   include/linux/console.h                 |  6 ------
>   19 files changed, 73 insertions(+), 57 deletions(-)
>   create mode 100644 drivers/gpu/drm/drm_nomodeset.c
> 

-- 
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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Re: [PATCH 0/5] Cleanups for the nomodeset kernel command line parameter logic

[Javier Martinez Canillas]

On 11/3/21 13:37, Thomas Zimmermann wrote:
> Hi,
> 
> dri-devel is missing. Please resubmit with dri-devel in cc.
>

Done, sorry about that.

I had `diff noprefix true` in my git config which seems to confuse
the get_maintainer.pl script. 
 
> Best regards
> Thomas
> 
Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat

Re: [PATCH 2/5] drm: Move nomodeset kernel parameter handler to the DRM subsystem

[Pekka Paalanen]

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On Wed, 3 Nov 2021 08:34:20 -0400
Neal Gompa <ngompa13@gmail.com> wrote:

> On Wed, Nov 3, 2021 at 8:32 AM Thomas Zimmermann <tzimmermann@suse.de> wrote:
> >
> > Hi
> >
> > Am 03.11.21 um 12:05 schrieb Neal Gompa:  
> > > On Wed, Nov 3, 2021 at 6:48 AM Javier Martinez Canillas
> > > <javierm@redhat.com> wrote:  
> > >>
> > >> 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 that to DRM.
> > >>
> > >> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > >> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> > >> ---  
> > >
> > > Please no, I'd much rather have a better, more meaningful option
> > > instead of "nomodeset". If anything, I would like this option to
> > > eventually do nothing and replace it with a better named option that's
> > > namespaced by drm on the command-line. That was part of the feedback I
> > > gave in the original patch set, and I still stand by that.  
> >
> > This was nack'ed for now during irc chats with others. There was no
> > clear semantics for the new parameter and nomodeset is good enough for
> > now. I agree that nomodeset is badly named, though.
> >  
> 
> Where are these chats happening? I'm mostly talking to Javier in the
> #devel:fedoraproject.org Matrix room, so I don't know about anything
> else...

OFTC IRC channel #dri-devel


Thanks,
pq

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