Here are some hacks to work around mutex crashes in the drm / i915 code. For now, this is the only way to make the kms / kgdb path safe on an SMP system.
CC: Jesse Barnes <[email protected]> CC: David Airlie <[email protected]> Signed-off-by: Jason Wessel <[email protected]> --- drivers/gpu/drm/drm_fb_helper.c | 18 ++++++++++++++++++ drivers/gpu/drm/i915/intel_display.c | 21 +++++++++++++++++++++ 2 files changed, 39 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index b390fd8..ac9ca4a 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -400,8 +400,14 @@ static void drm_fb_helper_on(struct fb_info *info) !crtc->enabled) continue; +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_lock(&dev->mode_config.mutex); crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->mode_config.mutex); /* Found a CRTC on this fb, now find encoders */ @@ -410,8 +416,14 @@ static void drm_fb_helper_on(struct fb_info *info) struct drm_encoder_helper_funcs *encoder_funcs; encoder_funcs = encoder->helper_private; +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_lock(&dev->mode_config.mutex); encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->mode_config.mutex); } } @@ -828,8 +840,14 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, modeset->y = var->yoffset; if (modeset->num_connectors) { +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_lock(&dev->mode_config.mutex); ret = crtc->funcs->set_config(modeset); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->mode_config.mutex); if (!ret) { info->var.xoffset = var->xoffset; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 71816db..669f9b4 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -949,6 +949,12 @@ intel_find_pll_g4x_dp(const intel_limit_t *limit, struct drm_crtc *crtc, void intel_wait_for_vblank(struct drm_device *dev) { +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) != -1) { + mdelay(20); + return; + } +#endif /* CONFIG_KGDB */ /* Wait for 20ms, i.e. one cycle at 50hz. */ msleep(20); } @@ -1371,9 +1377,15 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y, obj = intel_fb->obj; obj_priv = obj->driver_private; +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_lock(&dev->struct_mutex); ret = intel_pin_and_fence_fb_obj(dev, obj); if (ret != 0) { +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->struct_mutex); return ret; } @@ -1381,6 +1393,9 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y, ret = i915_gem_object_set_to_gtt_domain(obj, 1); if (ret != 0) { i915_gem_object_unpin(obj); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->struct_mutex); return ret; } @@ -1408,6 +1423,9 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y, default: DRM_ERROR("Unknown color depth\n"); i915_gem_object_unpin(obj); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->struct_mutex); return -EINVAL; } @@ -1452,6 +1470,9 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y, } intel_increase_pllclock(crtc, true); +#ifdef CONFIG_KGDB + if (atomic_read(&kgdb_active) == -1) +#endif mutex_unlock(&dev->struct_mutex); if (!dev->primary->master) -- 1.6.4.rc1 ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
