Re: [PATCH v2 6/6] drm/vkms: Add a module param to enable/disable the default device

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Hi Jim,

On 6/23/23 19:23, Jim Shargo wrote:
In many testing circumstances, we will want to just create a new device
and test against that. If we create a default device, it can be annoying
to have to manually select the new device instead of choosing the only
one that exists.

The param, enable_default, is defaulted to true to maintain backwards
compatibility.

Signed-off-by: Jim Shargo <jshargo@xxxxxxxxxxxx>
---
  drivers/gpu/drm/vkms/vkms_drv.c | 44 ++++++++++++++++++++++-----------
  1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 314a04659c5f..1cb56c090a65 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -42,17 +42,26 @@
  #define DRIVER_MAJOR	1
  #define DRIVER_MINOR	0
+static bool enable_default_device = true;
+module_param_named(enable_default_device, enable_default_device, bool, 0444);
+MODULE_PARM_DESC(enable_default_device,
+		 "Enable/Disable creating the default device");

Wouldn't be better to just call it "enable_default"?

Also, could you add this parameter to vkms_config debugfs file?

Best Regards,
- Maíra

+
  static bool enable_cursor = true;
  module_param_named(enable_cursor, enable_cursor, bool, 0444);
-MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
+MODULE_PARM_DESC(enable_cursor,
+		 "Enable/Disable cursor support for the default device");
static bool enable_writeback = true;
  module_param_named(enable_writeback, enable_writeback, bool, 0444);
-MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");
+MODULE_PARM_DESC(
+	enable_writeback,
+	"Enable/Disable writeback connector support for the default device");
static bool enable_overlay;
  module_param_named(enable_overlay, enable_overlay, bool, 0444);
-MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
+MODULE_PARM_DESC(enable_overlay,
+		 "Enable/Disable overlay support for the default device");
DEFINE_DRM_GEM_FOPS(vkms_driver_fops); @@ -278,10 +287,7 @@ void vkms_remove_device(struct vkms_device *vkms_device)
  static int __init vkms_init(void)
  {
  	int ret;
-	struct platform_device *pdev;
-	struct vkms_device_setup vkms_device_setup = {
-		.configfs = NULL,
-	};
+	struct platform_device *default_pdev = NULL;
ret = platform_driver_register(&vkms_platform_driver);
  	if (ret) {
@@ -289,19 +295,27 @@ static int __init vkms_init(void)
  		return ret;
  	}
- pdev = platform_device_register_data(NULL, DRIVER_NAME, 0,
-					     &vkms_device_setup,
-					     sizeof(vkms_device_setup));
-	if (IS_ERR(pdev)) {
-		DRM_ERROR("Unable to register default vkms device\n");
-		platform_driver_unregister(&vkms_platform_driver);
-		return PTR_ERR(pdev);
+	if (enable_default_device) {
+		struct vkms_device_setup vkms_device_setup = {
+			.configfs = NULL,
+		};
+
+		default_pdev = platform_device_register_data(
+			NULL, DRIVER_NAME, 0, &vkms_device_setup,
+			sizeof(vkms_device_setup));
+		if (IS_ERR(default_pdev)) {
+			DRM_ERROR("Unable to register default vkms device\n");
+			platform_driver_unregister(&vkms_platform_driver);
+			return PTR_ERR(default_pdev);
+		}
  	}
ret = vkms_init_configfs();
  	if (ret) {
  		DRM_ERROR("Unable to initialize configfs\n");
-		platform_device_unregister(pdev);
+		if (default_pdev)
+			platform_device_unregister(default_pdev);
+
  		platform_driver_unregister(&vkms_platform_driver);
  	}



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