From: Thomas Zimmermann tzimmermann@suse.de
commit 014125c64d09e58e90dde49fbb57d802a13e2559 upstream.
Setting 'nomodeset' on the kernel command line disables all graphics drivers with modesetting capabilities, leaving only firmware drivers, such as simpledrm or efifb.
Most DRM drivers automatically support 'nomodeset' via DRM's module helper macros. In xe, which uses regular module_init(), manually call drm_firmware_drivers_only() to test for 'nomodeset'. Do not register the driver if set.
v2: - use xe's init table (Lucas) - do NULL test for init/exit functions
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Lucas De Marchi lucas.demarchi@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20240827121003.97429-1-tzimmer... Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com --- drivers/gpu/drm/xe/xe_module.c | 39 +++++++++++++++++++++++++++++++--- 1 file changed, 36 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_module.c b/drivers/gpu/drm/xe/xe_module.c index 499540add465a..464ec24e2dd20 100644 --- a/drivers/gpu/drm/xe/xe_module.c +++ b/drivers/gpu/drm/xe/xe_module.c @@ -8,6 +8,8 @@ #include <linux/init.h> #include <linux/module.h>
+#include <drm/drm_module.h> + #include "xe_drv.h" #include "xe_hw_fence.h" #include "xe_pci.h" @@ -61,12 +63,23 @@ module_param_named_unsafe(wedged_mode, xe_modparam.wedged_mode, int, 0600); MODULE_PARM_DESC(wedged_mode, "Module's default policy for the wedged mode - 0=never, 1=upon-critical-errors[default], 2=upon-any-hang");
+static int xe_check_nomodeset(void) +{ + if (drm_firmware_drivers_only()) + return -ENODEV; + + return 0; +} + struct init_funcs { int (*init)(void); void (*exit)(void); };
static const struct init_funcs init_funcs[] = { + { + .init = xe_check_nomodeset, + }, { .init = xe_hw_fence_module_init, .exit = xe_hw_fence_module_exit, @@ -85,15 +98,35 @@ static const struct init_funcs init_funcs[] = { }, };
+static int __init xe_call_init_func(unsigned int i) +{ + if (WARN_ON(i >= ARRAY_SIZE(init_funcs))) + return 0; + if (!init_funcs[i].init) + return 0; + + return init_funcs[i].init(); +} + +static void xe_call_exit_func(unsigned int i) +{ + if (WARN_ON(i >= ARRAY_SIZE(init_funcs))) + return; + if (!init_funcs[i].exit) + return; + + init_funcs[i].exit(); +} + static int __init xe_init(void) { int err, i;
for (i = 0; i < ARRAY_SIZE(init_funcs); i++) { - err = init_funcs[i].init(); + err = xe_call_init_func(i); if (err) { while (i--) - init_funcs[i].exit(); + xe_call_exit_func(i); return err; } } @@ -106,7 +139,7 @@ static void __exit xe_exit(void) int i;
for (i = ARRAY_SIZE(init_funcs) - 1; i >= 0; i--) - init_funcs[i].exit(); + xe_call_exit_func(i); }
module_init(xe_init);