linux-kernel - Re: [PATCH 08/15] drm/radeon: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL

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Date:   Fri, 17 Sep 2021 11:40:31 -0400
From:   Sean Paul <sean@...rly.run>
To:     Fernando Ramos <greenfoo@....eu>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        sean@...rly.run, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 08/15] drm/radeon: cleanup: drm_modeset_lock_all() -->
 DRM_MODESET_LOCK_ALL_BEGIN()

On Thu, Sep 16, 2021 at 11:15:45PM +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@....eu>
> ---
>  drivers/gpu/drm/radeon/radeon_device.c | 13 +++++++++----
>  drivers/gpu/drm/radeon/radeon_dp_mst.c |  7 +++++--
>  2 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
> index 4f0fbf667431..3feb1fd44409 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -37,6 +37,7 @@
>  #include <drm/drm_cache.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_device.h>
> +#include <drm/drm_drv.h>
>  #include <drm/drm_file.h>
>  #include <drm/drm_probe_helper.h>
>  #include <drm/radeon_drm.h>
> @@ -1559,7 +1560,9 @@ int radeon_suspend_kms(struct drm_device *dev, bool suspend,
>  	struct pci_dev *pdev;
>  	struct drm_crtc *crtc;
>  	struct drm_connector *connector;
> +	struct drm_modeset_acquire_ctx ctx;
>  	int i, r;
> +	int ret;

Could you please tuck this up with i & r?

>  
>  	if (dev == NULL || dev->dev_private == NULL) {
>  		return -ENODEV;
> @@ -1573,12 +1576,12 @@ int radeon_suspend_kms(struct drm_device *dev, bool suspend,
>  
>  	drm_kms_helper_poll_disable(dev);
>  
> -	drm_modeset_lock_all(dev);
> +	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
>  	/* turn off display hw */
>  	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
>  		drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
>  	}
> -	drm_modeset_unlock_all(dev);
> +	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);

You should check ret here

>  
>  	/* unpin the front buffers and cursors */
>  	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
> @@ -1663,7 +1666,9 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
>  	struct radeon_device *rdev = dev->dev_private;
>  	struct pci_dev *pdev = to_pci_dev(dev->dev);
>  	struct drm_crtc *crtc;
> +	struct drm_modeset_acquire_ctx ctx;
>  	int r;
> +	int ret;

Same suggestion here, move up with r

>  
>  	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
>  		return 0;
> @@ -1741,11 +1746,11 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
>  	if (fbcon) {
>  		drm_helper_resume_force_mode(dev);
>  		/* turn on display hw */
> -		drm_modeset_lock_all(dev);
> +		DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
>  		list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
>  			drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
>  		}
> -		drm_modeset_unlock_all(dev);
> +		DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);

Also check ret here


>  	}
>  
>  	drm_kms_helper_poll_enable(dev);
> diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> index ec867fa880a4..04fe7b0a6746 100644
> --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
> +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
> @@ -4,6 +4,7 @@
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_file.h>
>  #include <drm/drm_probe_helper.h>
> +#include <drm/drm_drv.h>
>  
>  #include "atom.h"
>  #include "ni_reg.h"
> @@ -737,11 +738,13 @@ static int radeon_debugfs_mst_info_show(struct seq_file *m, void *unused)
>  	struct radeon_device *rdev = (struct radeon_device *)m->private;
>  	struct drm_device *dev = rdev->ddev;
>  	struct drm_connector *connector;
> +	struct drm_modeset_acquire_ctx ctx;
>  	struct radeon_connector *radeon_connector;
>  	struct radeon_connector_atom_dig *dig_connector;
>  	int i;
> +	int ret;

Move up with i

>  
> -	drm_modeset_lock_all(dev);
> +	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
>  	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
>  		if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
>  			continue;
> @@ -759,7 +762,7 @@ static int radeon_debugfs_mst_info_show(struct seq_file *m, void *unused)
>  				   radeon_connector->cur_stream_attribs[i].fe,
>  				   radeon_connector->cur_stream_attribs[i].slots);
>  	}
> -	drm_modeset_unlock_all(dev);
> +	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
>  	return 0;
>  }
>  
> -- 
> 2.33.0
> 

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