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SubjectRe: [PATCH 00/60] drm: Make all drivers to honour the nomodeset parameter
From
Hi Javier,

nothing wrong with your patches, but I'd like to propose slightly
differnt solution.

For many USB drivers, you put the drm_firmware_drivers_only() call into
the probe function. For registering, these drivers use
module_usb_driver(), which expands to generic device-register functions.

I'd like to propose a similar macro for DRM drivers that includes the
test for drm_firmware_drivers_only().

In drm_drv.h :

#if defined(USB)
static int drm_usb_register(struct usb_driver *usb)
{
if (drm_firmware_drivers_only())
return -ENODEV;
return usb_register_driver(usb);
}
#define drm_module_usb_driver(__usb)
module_driver(drm_usb_register, usb_deregister)
#endif

In each of the USB-based DRM drivers, replace module_usb_driver with
drm_module_usb_driver.

And then there's PCI [3] and platform drivers, [4] which can be handled
similarly. Many PCI drivers open-code the module init and device
registering with the driver-specific enable parameter. Maybe adding a
driver-specific register function would make sense.

Best regards
Thomas

[1]
https://elixir.bootlin.com/linux/v5.15.8/source/include/linux/usb.h#L1306
[2]
https://elixir.bootlin.com/linux/v5.15.8/source/include/linux/device/driver.h#L258
[3]
https://elixir.bootlin.com/linux/v5.15.8/source/include/linux/pci.h#L1453
[4]
https://elixir.bootlin.com/linux/v5.15.8/source/include/linux/platform_device.h#L251


Am 15.12.21 um 01:59 schrieb Javier Martinez Canillas:
> The nomodeset kernel command line parameter is used to prevent the KMS/DRM
> drivers to be registered/probed. But only a few drivers implement support
> for this parameter and most DRM drivers would just ignore it.
>
> This (huge) patch series makes all DRM drivers to honour this parameter. It
> is posted as separate patches to make easier for drivers maintainers to ack
> or pick them independently at their own pace.
>
> Patches are quite trivial and just add an if (drm_firmware_drivers_only())
> check and return -ENODEV if that's true. The condition is checked as early
> as possible, that is in the module_init handler for drivers that have one
> or in the probe function for drivers that are using the module_*_driver()
> macros and don't have their own module init function.
>
> I included all the DRM drivers that think makes sense. I only left the vc4
> and v3d drivers, that Maxime is already handling in another patch series
> and the vgem, vkms and simpledrm drivers that should ignore the param IMO.
>
> I've built tested with 'make allmodconfig && make M=drivers/gpu/drm/', but
> only booted in a few devices with and without nomodeset in the cmdline. So
> testing and reviewing for all the drivers would be highly appreciated.
>
> Best regards,
> Javier
>
>
> Javier Martinez Canillas (60):
> drm/komeda: Add support for the nomodeset kernel parameter
> drm/arm/hdlcd: Add support for the nomodeset kernel parameter
> drm/malidp: Add support for the nomodeset kernel parameter
> drm/armada: Add support for the nomodeset kernel parameter
> drm/aspeed: Add support for the nomodeset kernel parameter
> drm/atmel-hlcdc: Add support for the nomodeset kernel parameter
> drm/etnaviv: Add support for the nomodeset kernel parameter
> drm/exynos: Add support for the nomodeset kernel parameter
> drm/fsl-dcu: Add support for the nomodeset kernel parameter
> drm/gma500: Add support for the nomodeset kernel parameter
> drm/gud: Add support for the nomodeset kernel parameter
> drm/hisilicon/hibmc: Add support for the nomodeset kernel parameter
> drm/hisilicon/kirin: Add support for the nomodeset kernel parameter
> drm/hyperv: Add support for the nomodeset kernel parameter
> drm/i810: Add support for the nomodeset kernel parameter
> drm/imx/dcss: Add support for the nomodeset kernel parameter
> drm/imx: Add support for the nomodeset kernel parameter
> drm/ingenic: Add support for the nomodeset kernel parameter
> drm/kmb: Add support for the nomodeset kernel parameter
> drm/lima: Add support for the nomodeset kernel parameter
> drm/mcde: Add support for the nomodeset kernel parameter
> drm/mediatek: Add support for the nomodeset kernel parameter
> drm/meson: Add support for the nomodeset kernel parameter
> drm/mga: Add support for the nomodeset kernel parameter
> drm/msm: Add support for the nomodeset kernel parameter
> drm: mxsfb: Add support for the nomodeset kernel parameter
> drm/omap: Add support for the nomodeset kernel parameter
> drm/panel: ilitek-ili9341: Add support for the nomodeset kernel
> parameter
> drm/panfrost: Add support for the nomodeset kernel parameter
> drm/pl111: Add support for the nomodeset kernel parameter
> drm/r128: Add support for the nomodeset kernel parameter
> drm: rcar-du: Add support for the nomodeset kernel parameter
> drm/rockchip: Add support for the nomodeset kernel parameter
> drm/savage: Add support for the nomodeset kernel parameter
> drm/shmobile: Add support for the nomodeset kernel parameter
> drm/sis: Add support for the nomodeset kernel parameter
> drm/sprd: Add support for the nomodeset kernel parameter
> drm/sti: Add support for the nomodeset kernel parameter
> drm/stm: Add support for the nomodeset kernel parameter
> drm/sun4i: Add support for the nomodeset kernel parameter
> drm/tdfx: Add support for the nomodeset kernel parameter
> drm/tegra: Add support for the nomodeset kernel parameter
> drm/tidss: Add support for the nomodeset kernel parameter
> drm/tilcdc: Add support for the nomodeset kernel parameter
> drm/arc: Add support for the nomodeset kernel parameter
> drm/gm12u320: Add support for the nomodeset kernel parameter
> drm/hx8357d: Add support for the nomodeset kernel parameter
> drm/ili9163: Add support for the nomodeset kernel parameter
> drm/ili9225: Add support for the nomodeset kernel parameter
> drm/ili9341: Add support for the nomodeset kernel parameter
> drm/ili9486: Add support for the nomodeset kernel parameter
> drm/mi0283qt: Add support for the nomodeset kernel parameter
> drm/repaper: Add support for the nomodeset kernel parameter
> drm/st7586: Add support for the nomodeset kernel parameter
> drm/st7735r: Add support for the nomodeset kernel parameter
> drm/tve200: Add support for the nomodeset kernel parameter
> drm/udl: Add support for the nomodeset kernel parameter
> drm/via: Add support for the nomodeset kernel parameter
> drm/xen: Add support for the nomodeset kernel parameter
> drm/xlnx: Add support for the nomodeset kernel parameter
>
> drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 4 ++++
> drivers/gpu/drm/arm/hdlcd_drv.c | 3 +++
> drivers/gpu/drm/arm/malidp_drv.c | 3 +++
> drivers/gpu/drm/armada/armada_drv.c | 3 +++
> drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 3 +++
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 3 +++
> drivers/gpu/drm/etnaviv/etnaviv_drv.c | 3 +++
> drivers/gpu/drm/exynos/exynos_drm_drv.c | 3 +++
> drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 3 +++
> drivers/gpu/drm/gma500/psb_drv.c | 3 +++
> drivers/gpu/drm/gud/gud_drv.c | 3 +++
> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 3 +++
> drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 3 +++
> drivers/gpu/drm/hyperv/hyperv_drm_drv.c | 3 +++
> drivers/gpu/drm/i810/i810_drv.c | 3 +++
> drivers/gpu/drm/imx/dcss/dcss-drv.c | 3 +++
> drivers/gpu/drm/imx/imx-drm-core.c | 3 +++
> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 3 +++
> drivers/gpu/drm/kmb/kmb_drv.c | 3 +++
> drivers/gpu/drm/lima/lima_drv.c | 3 +++
> drivers/gpu/drm/mcde/mcde_drv.c | 3 +++
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 3 +++
> drivers/gpu/drm/meson/meson_drv.c | 3 +++
> drivers/gpu/drm/mga/mga_drv.c | 3 +++
> drivers/gpu/drm/msm/msm_drv.c | 3 +++
> drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +++
> drivers/gpu/drm/omapdrm/omap_drv.c | 3 +++
> drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 3 +++
> drivers/gpu/drm/panfrost/panfrost_drv.c | 3 +++
> drivers/gpu/drm/pl111/pl111_drv.c | 3 +++
> drivers/gpu/drm/r128/r128_drv.c | 3 +++
> drivers/gpu/drm/rcar-du/rcar_du_drv.c | 3 +++
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 3 +++
> drivers/gpu/drm/savage/savage_drv.c | 3 +++
> drivers/gpu/drm/shmobile/shmob_drm_drv.c | 3 +++
> drivers/gpu/drm/sis/sis_drv.c | 3 +++
> drivers/gpu/drm/sprd/sprd_drm.c | 3 +++
> drivers/gpu/drm/sti/sti_drv.c | 3 +++
> drivers/gpu/drm/stm/drv.c | 3 +++
> drivers/gpu/drm/sun4i/sun4i_drv.c | 3 +++
> drivers/gpu/drm/tdfx/tdfx_drv.c | 3 +++
> drivers/gpu/drm/tegra/drm.c | 3 +++
> drivers/gpu/drm/tidss/tidss_drv.c | 3 +++
> drivers/gpu/drm/tilcdc/tilcdc_drv.c | 3 +++
> drivers/gpu/drm/tiny/arcpgu.c | 3 +++
> drivers/gpu/drm/tiny/gm12u320.c | 3 +++
> drivers/gpu/drm/tiny/hx8357d.c | 3 +++
> drivers/gpu/drm/tiny/ili9163.c | 3 +++
> drivers/gpu/drm/tiny/ili9225.c | 3 +++
> drivers/gpu/drm/tiny/ili9341.c | 3 +++
> drivers/gpu/drm/tiny/ili9486.c | 3 +++
> drivers/gpu/drm/tiny/mi0283qt.c | 3 +++
> drivers/gpu/drm/tiny/repaper.c | 3 +++
> drivers/gpu/drm/tiny/st7586.c | 3 +++
> drivers/gpu/drm/tiny/st7735r.c | 3 +++
> drivers/gpu/drm/tve200/tve200_drv.c | 3 +++
> drivers/gpu/drm/udl/udl_drv.c | 3 +++
> drivers/gpu/drm/via/via_drv.c | 3 +++
> drivers/gpu/drm/xen/xen_drm_front.c | 3 +++
> drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 3 +++
> 60 files changed, 181 insertions(+)
>

--
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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