From: Daniel Vetter Date: Mon, 3 Apr 2017 08:32:59 +0000 (+0200) Subject: drm/fb-helper: Give up on kgdb for atomic drivers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9c79e0b1d096c06e4b012a32dddb04be0ce9716e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/fb-helper: Give up on kgdb for atomic drivers It just doesn't work. It probably stopped working way, way before that (e.g. i915 grabbed random mutexes all over in modeset code at least since gen6), but with atomic and all the ww_mutex stuff it's indeed hopeless. Remove ->mode_set_base_atomic from the 2 atomic drivers (i915 and nouveau) that still had one (both had dummy implementations already anyway), and shunt atomic drivers in the helpers debug_enter/leave functions. I'll leave the code in for radeon and amdgpu, but I think as soon as amdgpu is atomic we should think about just ripping it out. Only having it around for radeon and pre-nv50 is rather pointless. This would also allow us to nuke all that code from fbdev. Funny part is that _all_ kms drivers set this hook, despite that no one else provides the required ->mode_set_base_atomic implementation. The reason I'm jumping on this is that I want to wire up a full acquire ctx for the benefit of atomic drivers, everywhere. And the debug_enter/leave implementations call ->gamma_set. And there's just no way ever we can create an acquire_ctx in the nmi context of kgdb. Cc: Ben Skeggs Cc: Alex Deucher Reviewed-by: Maarten Lankhorst Acked-by: Alex Deucher Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-11-daniel.vetter@ffwll.ch --- diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 673a47445d61..9147abb774e8 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -281,6 +281,9 @@ int drm_fb_helper_debug_enter(struct fb_info *info) if (funcs->mode_set_base_atomic == NULL) continue; + if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev)) + continue; + drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); funcs->mode_set_base_atomic(mode_set->crtc, mode_set->fb, @@ -338,6 +341,9 @@ int drm_fb_helper_debug_leave(struct fb_info *info) if (funcs->mode_set_base_atomic == NULL) continue; + if (drm_drv_uses_atomic_modeset(crtc->dev)) + continue; + drm_fb_helper_restore_lut_atomic(mode_set->crtc); funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, crtc->y, LEAVE_ATOMIC_MODE_SET); diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index f41a1f8b296b..602fd479dd30 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3439,17 +3439,6 @@ static void skylake_disable_primary_plane(struct drm_plane *primary, spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); } -/* Assume fb object is pinned & idle & fenced and just update base pointers */ -static int -intel_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb, - int x, int y, enum mode_set_atomic state) -{ - /* Support for kgdboc is disabled, this needs a major rework. */ - DRM_ERROR("legacy panic handler not supported any more.\n"); - - return -ENODEV; -} - static void intel_complete_page_flips(struct drm_i915_private *dev_priv) { struct intel_crtc *crtc; @@ -11005,7 +10994,6 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc, } static const struct drm_crtc_helper_funcs intel_helper_funcs = { - .mode_set_base_atomic = intel_pipe_set_base_atomic, .atomic_begin = intel_begin_crtc_commit, .atomic_flush = intel_finish_crtc_commit, .atomic_check = intel_crtc_atomic_check, diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c index 418872b493a3..3d381d5c82ce 100644 --- a/drivers/gpu/drm/nouveau/nv50_display.c +++ b/drivers/gpu/drm/nouveau/nv50_display.c @@ -2210,18 +2210,8 @@ nv50_head_lut_load(struct drm_crtc *crtc) } } -static int -nv50_head_mode_set_base_atomic(struct drm_crtc *crtc, - struct drm_framebuffer *fb, int x, int y, - enum mode_set_atomic state) -{ - WARN_ON(1); - return 0; -} - static const struct drm_crtc_helper_funcs nv50_head_help = { - .mode_set_base_atomic = nv50_head_mode_set_base_atomic, .load_lut = nv50_head_lut_load, .atomic_check = nv50_head_atomic_check, };