Re: [PATCH 04/15] drm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()

From: Sean Paul
Date: Fri Sep 17 2021 - 11:35:09 EST

On Thu, Sep 16, 2021 at 11:15:41PM +0200, Fernando Ramos wrote:
> As requested in Documentation/gpu/todo.rst, replace driver calls to
> drm_modeset_lock_all() with DRM_MODESET_LOCK_ALL_BEGIN() and
> DRM_MODESET_LOCK_ALL_END()
>
> Signed-off-by: Fernando Ramos <greenfoo@xxxxxx>

Reviewed-by: Sean Paul <sean@xxxxxxxxxx>

> ---
> drivers/gpu/drm/drm_client_modeset.c | 5 +++--
> drivers/gpu/drm/drm_crtc_helper.c | 18 ++++++++++++------
> drivers/gpu/drm/drm_fb_helper.c | 10 ++++++----
> drivers/gpu/drm/drm_framebuffer.c | 6 ++++--
> 4 files changed, 25 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
> index 5f5184f071ed..43f772543d2a 100644
> --- a/drivers/gpu/drm/drm_client_modeset.c
> +++ b/drivers/gpu/drm/drm_client_modeset.c
> @@ -1062,9 +1062,10 @@ static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
> struct drm_device *dev = client->dev;
> struct drm_mode_set *mode_set;
> struct drm_plane *plane;
> + struct drm_modeset_acquire_ctx ctx;
> int ret = 0;
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> drm_for_each_plane(plane, dev) {
> if (plane->type != DRM_PLANE_TYPE_PRIMARY)
> drm_plane_force_disable(plane);
> @@ -1093,7 +1094,7 @@ static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
> goto out;
> }
> out:
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
>
> return ret;
> }
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index bff917531f33..f3ce073dff79 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -218,11 +218,14 @@ static void __drm_helper_disable_unused_functions(struct drm_device *dev)
> */
> void drm_helper_disable_unused_functions(struct drm_device *dev)
> {
> + struct drm_modeset_acquire_ctx ctx;
> + int ret;
> +
> WARN_ON(drm_drv_uses_atomic_modeset(dev));
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> __drm_helper_disable_unused_functions(dev);
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
> }
> EXPORT_SYMBOL(drm_helper_disable_unused_functions);
>
> @@ -942,12 +945,14 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
> struct drm_crtc *crtc;
> struct drm_encoder *encoder;
> const struct drm_crtc_helper_funcs *crtc_funcs;
> + struct drm_modeset_acquire_ctx ctx;
> int encoder_dpms;
> bool ret;
> + int err;
>
> WARN_ON(drm_drv_uses_atomic_modeset(dev));
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
> drm_for_each_crtc(crtc, dev) {
>
> if (!crtc->enabled)
> @@ -982,7 +987,7 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
>
> /* disable the unused connectors while restoring the modesetting */
> __drm_helper_disable_unused_functions(dev);
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
> }
> EXPORT_SYMBOL(drm_helper_resume_force_mode);
>
> @@ -1002,9 +1007,10 @@ EXPORT_SYMBOL(drm_helper_resume_force_mode);
> int drm_helper_force_disable_all(struct drm_device *dev)
> {
> struct drm_crtc *crtc;
> + struct drm_modeset_acquire_ctx ctx;
> int ret = 0;
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> drm_for_each_crtc(crtc, dev)
> if (crtc->enabled) {
> struct drm_mode_set set = {
> @@ -1016,7 +1022,7 @@ int drm_helper_force_disable_all(struct drm_device *dev)
> goto out;
> }
> out:
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
> return ret;
> }
> EXPORT_SYMBOL(drm_helper_force_disable_all);
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 3ab078321045..6860223f0068 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -940,10 +940,11 @@ static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
> struct drm_fb_helper *fb_helper = info->par;
> struct drm_mode_set *modeset;
> struct drm_crtc *crtc;
> + struct drm_modeset_acquire_ctx ctx;
> u16 *r, *g, *b;
> int ret = 0;
>
> - drm_modeset_lock_all(fb_helper->dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(fb_helper->dev, ctx, 0, ret);
> drm_client_for_each_modeset(modeset, &fb_helper->client) {
> crtc = modeset->crtc;
> if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
> @@ -970,7 +971,7 @@ static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
> goto out;
> }
> out:
> - drm_modeset_unlock_all(fb_helper->dev);
> + DRM_MODESET_LOCK_ALL_END(fb_helper->dev, ctx, ret);
>
> return ret;
> }
> @@ -1441,10 +1442,11 @@ static int pan_display_legacy(struct fb_var_screeninfo *var,
> struct drm_fb_helper *fb_helper = info->par;
> struct drm_client_dev *client = &fb_helper->client;
> struct drm_mode_set *modeset;
> + struct drm_modeset_acquire_ctx ctx;
> int ret = 0;
>
> mutex_lock(&client->modeset_mutex);
> - drm_modeset_lock_all(fb_helper->dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(fb_helper->dev, ctx, 0, ret);
> drm_client_for_each_modeset(modeset, client) {
> modeset->x = var->xoffset;
> modeset->y = var->yoffset;
> @@ -1457,7 +1459,7 @@ static int pan_display_legacy(struct fb_var_screeninfo *var,
> }
> }
> }
> - drm_modeset_unlock_all(fb_helper->dev);
> + DRM_MODESET_LOCK_ALL_END(fb_helper->dev, ctx, ret);
> mutex_unlock(&client->modeset_mutex);
>
> return ret;
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index 07f5abc875e9..205e9aa9a409 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -1059,8 +1059,10 @@ static void legacy_remove_fb(struct drm_framebuffer *fb)
> struct drm_device *dev = fb->dev;
> struct drm_crtc *crtc;
> struct drm_plane *plane;
> + struct drm_modeset_acquire_ctx ctx;
> + int ret;
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> /* remove from any CRTC */
> drm_for_each_crtc(crtc, dev) {
> if (crtc->primary->fb == fb) {
> @@ -1082,7 +1084,7 @@ static void legacy_remove_fb(struct drm_framebuffer *fb)
> drm_plane_force_disable(plane);
> }
> }
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
> }
>
> /**
> --
> 2.33.0
>

--
Sean Paul, Software Engineer, Google / Chromium OS