Re: [PATCH 3/3] drm/amdgpu: Embed drm_device into amdgpu_device (v2)

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On Wed, Aug 19, 2020 at 01:00:42AM -0400, Luben Tuikov wrote:
> a) Embed struct drm_device into struct amdgpu_device.
> b) Modify the inline-f drm_to_adev() accordingly.
> c) Modify the inline-f adev_to_drm() accordingly.
> d) Eliminate the use of drm_device.dev_private,
>    in amdgpu.
> e) Switch from using drm_dev_alloc() to
>    drm_dev_init().
> f) Add a DRM driver release function, which frees
>    the container amdgpu_device after all krefs on
>    the contained drm_device have been released.
> 
> v2: Split out adding adev_to_drm() into its own
>     patch (previous commit), making this patch
>     more succinct and clear. More detailed commit
>     description.
> 
> Signed-off-by: Luben Tuikov <luben.tuikov@xxxxxxx>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h        | 10 ++---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 15 +++-----
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 43 ++++++++++++++--------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c    | 20 +++-------
>  4 files changed, 43 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 735480cc7dcf..107a6ec920f7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -724,8 +724,8 @@ struct amd_powerplay {
>  #define AMDGPU_MAX_DF_PERFMONS 4
>  struct amdgpu_device {
>  	struct device			*dev;
> -	struct drm_device		*ddev;
>  	struct pci_dev			*pdev;
> +	struct drm_device		ddev;
>  
>  #ifdef CONFIG_DRM_AMD_ACP
>  	struct amdgpu_acp		acp;
> @@ -990,12 +990,12 @@ struct amdgpu_device {
>  
>  static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
>  {
> -	return ddev->dev_private;
> +	return container_of(ddev, struct amdgpu_device, ddev);
>  }
>  
>  static inline struct drm_device *adev_to_drm(struct amdgpu_device *adev)
>  {
> -	return adev->ddev;
> +	return &adev->ddev;
>  }
>  
>  static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
> @@ -1004,8 +1004,6 @@ static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
>  }
>  
>  int amdgpu_device_init(struct amdgpu_device *adev,
> -		       struct drm_device *ddev,
> -		       struct pci_dev *pdev,
>  		       uint32_t flags);
>  void amdgpu_device_fini(struct amdgpu_device *adev);
>  int amdgpu_gpu_wait_for_idle(struct amdgpu_device *adev);
> @@ -1195,7 +1193,7 @@ static inline void *amdgpu_atpx_get_dhandle(void) { return NULL; }
>  extern const struct drm_ioctl_desc amdgpu_ioctls_kms[];
>  extern const int amdgpu_max_kms_ioctl;
>  
> -int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags);
> +int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags);
>  void amdgpu_driver_unload_kms(struct drm_device *dev);
>  void amdgpu_driver_lastclose_kms(struct drm_device *dev);
>  int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 07012d71eeea..6e529548e708 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -1216,7 +1216,8 @@ static int amdgpu_device_check_arguments(struct amdgpu_device *adev)
>   * Callback for the switcheroo driver.  Suspends or resumes the
>   * the asics before or after it is powered up using ACPI methods.
>   */
> -static void amdgpu_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
> +static void amdgpu_switcheroo_set_state(struct pci_dev *pdev,
> +					enum vga_switcheroo_state state)
>  {
>  	struct drm_device *dev = pci_get_drvdata(pdev);
>  	int r;
> @@ -2977,8 +2978,6 @@ static const struct attribute *amdgpu_dev_attributes[] = {
>   * amdgpu_device_init - initialize the driver
>   *
>   * @adev: amdgpu_device pointer
> - * @ddev: drm dev pointer
> - * @pdev: pci dev pointer
>   * @flags: driver flags
>   *
>   * Initializes the driver info and hw (all asics).
> @@ -2986,18 +2985,15 @@ static const struct attribute *amdgpu_dev_attributes[] = {
>   * Called at driver startup.
>   */
>  int amdgpu_device_init(struct amdgpu_device *adev,
> -		       struct drm_device *ddev,
> -		       struct pci_dev *pdev,
>  		       uint32_t flags)
>  {
> +	struct drm_device *ddev = adev_to_drm(adev);
> +	struct pci_dev *pdev = adev->pdev;
>  	int r, i;
>  	bool boco = false;
>  	u32 max_MBps;
>  
>  	adev->shutdown = false;
> -	adev->dev = &pdev->dev;
> -	adev->ddev = ddev;
> -	adev->pdev = pdev;
>  	adev->flags = flags;
>  
>  	if (amdgpu_force_asic_type >= 0 && amdgpu_force_asic_type < CHIP_LAST)
> @@ -3451,9 +3447,8 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
>  	struct drm_connector_list_iter iter;
>  	int r;
>  
> -	if (dev == NULL || dev->dev_private == NULL) {
> +	if (!dev)
>  		return -ENODEV;

Random comment, but is this really still needed?

This pattern goes back to dri1 shadow attach trickery where everything was
horrible and we could end up with a device but not a device and trying to
suspend it.

With a proper kms pci device you shouldn't ever end up in this situation
where the drm_device doesn't exist or isn't completely set up, but we're
trying to suspend. Maybe wrap in a WARN_ON at least?
-Daniel

> -	}
>  
>  	adev = drm_to_adev(dev);
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 38023c879db1..6866c515f00a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1082,7 +1082,7 @@ static struct drm_driver kms_driver;
>  static int amdgpu_pci_probe(struct pci_dev *pdev,
>  			    const struct pci_device_id *ent)
>  {
> -	struct drm_device *dev;
> +	struct drm_device *ddev;
>  	struct amdgpu_device *adev;
>  	unsigned long flags = ent->driver_data;
>  	int ret, retry = 0;
> @@ -1138,36 +1138,42 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>  	if (ret)
>  		return ret;
>  
> -	dev = drm_dev_alloc(&kms_driver, &pdev->dev);
> -	if (IS_ERR(dev))
> -		return PTR_ERR(dev);
> +	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
> +	if (!adev)
> +		return -ENOMEM;
> +
> +	adev->dev  = &pdev->dev;
> +	adev->pdev = pdev;
> +	ddev = adev_to_drm(adev);
> +	ret = drm_dev_init(ddev, &kms_driver, &pdev->dev);
> +	if (ret)
> +		goto err_free;
>  
>  	if (!supports_atomic)
> -		dev->driver_features &= ~DRIVER_ATOMIC;
> +		ddev->driver_features &= ~DRIVER_ATOMIC;
>  
>  	ret = pci_enable_device(pdev);
>  	if (ret)
>  		goto err_free;
>  
> -	dev->pdev = pdev;
> +	ddev->pdev = pdev;
> +	pci_set_drvdata(pdev, ddev);
>  
> -	pci_set_drvdata(pdev, dev);
> -
> -	ret = amdgpu_driver_load_kms(dev, ent->driver_data);
> +	ret = amdgpu_driver_load_kms(adev, ent->driver_data);
>  	if (ret)
>  		goto err_pci;
>  
>  retry_init:
> -	ret = drm_dev_register(dev, ent->driver_data);
> +	ret = drm_dev_register(ddev, ent->driver_data);
>  	if (ret == -EAGAIN && ++retry <= 3) {
>  		DRM_INFO("retry init %d\n", retry);
>  		/* Don't request EX mode too frequently which is attacking */
>  		msleep(5000);
>  		goto retry_init;
> -	} else if (ret)
> +	} else if (ret) {
>  		goto err_pci;
> +	}
>  
> -	adev = drm_to_adev(dev);
>  	ret = amdgpu_debugfs_init(adev);
>  	if (ret)
>  		DRM_ERROR("Creating debugfs files failed (%d).\n", ret);
> @@ -1177,7 +1183,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>  err_pci:
>  	pci_disable_device(pdev);
>  err_free:
> -	drm_dev_put(dev);
> +	drm_dev_put(ddev);
>  	return ret;
>  }
>  
> @@ -1197,6 +1203,14 @@ amdgpu_pci_remove(struct pci_dev *pdev)
>  	drm_dev_put(dev);
>  }
>  
> +static void amdgpu_driver_release(struct drm_device *ddev)
> +{
> +	struct amdgpu_device *adev = drm_to_adev(ddev);
> +
> +	drm_dev_fini(ddev);
> +	kfree(adev);
> +}
> +
>  static void
>  amdgpu_pci_shutdown(struct pci_dev *pdev)
>  {
> @@ -1491,6 +1505,7 @@ static struct drm_driver kms_driver = {
>  	.open = amdgpu_driver_open_kms,
>  	.postclose = amdgpu_driver_postclose_kms,
>  	.lastclose = amdgpu_driver_lastclose_kms,
> +	.release   = amdgpu_driver_release,
>  	.irq_handler = amdgpu_irq_handler,
>  	.ioctls = amdgpu_ioctls_kms,
>  	.gem_free_object_unlocked = amdgpu_gem_object_free,
> @@ -1525,8 +1540,6 @@ static struct pci_driver amdgpu_kms_pci_driver = {
>  	.driver.pm = &amdgpu_pm_ops,
>  };
>  
> -
> -
>  static int __init amdgpu_init(void)
>  {
>  	int r;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 47cd3558f9c7..f2a4fdcd542d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -86,7 +86,7 @@ void amdgpu_driver_unload_kms(struct drm_device *dev)
>  	amdgpu_unregister_gpu_instance(adev);
>  
>  	if (adev->rmmio == NULL)
> -		goto done_free;
> +		return;
>  
>  	if (adev->runpm) {
>  		pm_runtime_get_sync(dev->dev);
> @@ -96,10 +96,6 @@ void amdgpu_driver_unload_kms(struct drm_device *dev)
>  	amdgpu_acpi_fini(adev);
>  
>  	amdgpu_device_fini(adev);
> -
> -done_free:
> -	kfree(adev);
> -	dev->dev_private = NULL;
>  }
>  
>  void amdgpu_register_gpu_instance(struct amdgpu_device *adev)
> @@ -130,22 +126,18 @@ void amdgpu_register_gpu_instance(struct amdgpu_device *adev)
>  /**
>   * amdgpu_driver_load_kms - Main load function for KMS.
>   *
> - * @dev: drm dev pointer
> + * @adev: pointer to struct amdgpu_device
>   * @flags: device flags
>   *
>   * This is the main load function for KMS (all asics).
>   * Returns 0 on success, error on failure.
>   */
> -int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
> +int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags)
>  {
> -	struct amdgpu_device *adev;
> +	struct drm_device *dev;
>  	int r, acpi_status;
>  
> -	adev = kzalloc(sizeof(struct amdgpu_device), GFP_KERNEL);
> -	if (adev == NULL) {
> -		return -ENOMEM;
> -	}
> -	dev->dev_private = (void *)adev;
> +	dev = adev_to_drm(adev);
>  
>  	if (amdgpu_has_atpx() &&
>  	    (amdgpu_is_atpx_hybrid() ||
> @@ -160,7 +152,7 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
>  	 * properly initialize the GPU MC controller and permit
>  	 * VRAM allocation
>  	 */
> -	r = amdgpu_device_init(adev, dev, dev->pdev, flags);
> +	r = amdgpu_device_init(adev, flags);
>  	if (r) {
>  		dev_err(&dev->pdev->dev, "Fatal error during GPU init\n");
>  		goto out;
> -- 
> 2.28.0.215.g878e727637
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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