Re: [PATCH v3 08/12] drm/amdgpu: Split amdgpu_device_fini into early and late

[Daniel Vetter <daniel@ffwll.ch>]

On Sat, Nov 21, 2020 at 12:21:18AM -0500, Andrey Grodzovsky wrote:
> Some of the stuff in amdgpu_device_fini such as HW interrupts
> disable and pending fences finilization must be done right away on
> pci_remove while most of the stuff which relates to finilizing and
> releasing driver data structures can be kept until
> drm_driver.release hook is called, i.e. when the last device
> reference is dropped.
> 

Uh fini_late and fini_early are rathare meaningless namings, since no
clear why there's a split. If you used drm_connector_funcs as inspiration,
that's kinda not good because 'register' itself is a reserved keyword.
That's why we had to add late_ prefix, could as well have used
C_sucks_ as prefix :-) And then the early_unregister for consistency.

I think fini_hw and fini_sw (or maybe fini_drm) would be a lot clearer
about what they're doing.

I still strongly recommend that you cut over as much as possible of the
fini_hw work to devm_ and for the fini_sw/drm stuff there's drmm_
-Daniel

> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  6 +++++-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 16 ++++++++++++----
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  7 ++-----
>  drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c  | 15 ++++++++++++++-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c    | 24 +++++++++++++++---------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h    |  1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c    | 12 +++++++++++-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c    |  3 +++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h   |  3 ++-
>  9 files changed, 65 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 83ac06a..6243f6d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1063,7 +1063,9 @@ static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
>  
>  int amdgpu_device_init(struct amdgpu_device *adev,
>  		       uint32_t flags);
> -void amdgpu_device_fini(struct amdgpu_device *adev);
> +void amdgpu_device_fini_early(struct amdgpu_device *adev);
> +void amdgpu_device_fini_late(struct amdgpu_device *adev);
> +
>  int amdgpu_gpu_wait_for_idle(struct amdgpu_device *adev);
>  
>  void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
> @@ -1275,6 +1277,8 @@ void amdgpu_driver_lastclose_kms(struct drm_device *dev);
>  int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv);
>  void amdgpu_driver_postclose_kms(struct drm_device *dev,
>  				 struct drm_file *file_priv);
> +void amdgpu_driver_release_kms(struct drm_device *dev);
> +
>  int amdgpu_device_ip_suspend(struct amdgpu_device *adev);
>  int amdgpu_device_suspend(struct drm_device *dev, bool fbcon);
>  int amdgpu_device_resume(struct drm_device *dev, bool fbcon);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 2f60b70..797d94d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3557,14 +3557,12 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>   * Tear down the driver info (all asics).
>   * Called at driver shutdown.
>   */
> -void amdgpu_device_fini(struct amdgpu_device *adev)
> +void amdgpu_device_fini_early(struct amdgpu_device *adev)
>  {
>  	dev_info(adev->dev, "amdgpu: finishing device.\n");
>  	flush_delayed_work(&adev->delayed_init_work);
>  	adev->shutdown = true;
>  
> -	kfree(adev->pci_state);
> -
>  	/* make sure IB test finished before entering exclusive mode
>  	 * to avoid preemption on IB test
>  	 * */
> @@ -3581,11 +3579,18 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
>  		else
>  			drm_atomic_helper_shutdown(adev_to_drm(adev));
>  	}
> -	amdgpu_fence_driver_fini(adev);
> +	amdgpu_fence_driver_fini_early(adev);
>  	if (adev->pm_sysfs_en)
>  		amdgpu_pm_sysfs_fini(adev);
>  	amdgpu_fbdev_fini(adev);
> +
> +	amdgpu_irq_fini_early(adev);
> +}
> +
> +void amdgpu_device_fini_late(struct amdgpu_device *adev)
> +{
>  	amdgpu_device_ip_fini(adev);
> +	amdgpu_fence_driver_fini_late(adev);
>  	release_firmware(adev->firmware.gpu_info_fw);
>  	adev->firmware.gpu_info_fw = NULL;
>  	adev->accel_working = false;
> @@ -3621,6 +3626,9 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
>  		amdgpu_pmu_fini(adev);
>  	if (adev->mman.discovery_bin)
>  		amdgpu_discovery_fini(adev);
> +
> +	kfree(adev->pci_state);
> +
>  }
>  
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 7f98cf1..3d130fc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1244,14 +1244,10 @@ amdgpu_pci_remove(struct pci_dev *pdev)
>  {
>  	struct drm_device *dev = pci_get_drvdata(pdev);
>  
> -#ifdef MODULE
> -	if (THIS_MODULE->state != MODULE_STATE_GOING)
> -#endif
> -		DRM_ERROR("Hotplug removal is not supported\n");
>  	drm_dev_unplug(dev);
>  	amdgpu_driver_unload_kms(dev);
> +
>  	pci_disable_device(pdev);
> -	pci_set_drvdata(pdev, NULL);
>  	drm_dev_put(dev);
>  }
>  
> @@ -1557,6 +1553,7 @@ static struct drm_driver kms_driver = {
>  	.dumb_create = amdgpu_mode_dumb_create,
>  	.dumb_map_offset = amdgpu_mode_dumb_mmap,
>  	.fops = &amdgpu_driver_kms_fops,
> +	.release = &amdgpu_driver_release_kms,
>  
>  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> index d0b0021..c123aa6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> @@ -523,7 +523,7 @@ int amdgpu_fence_driver_init(struct amdgpu_device *adev)
>   *
>   * Tear down the fence driver for all possible rings (all asics).
>   */
> -void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
> +void amdgpu_fence_driver_fini_early(struct amdgpu_device *adev)
>  {
>  	unsigned i, j;
>  	int r;
> @@ -544,6 +544,19 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
>  		if (!ring->no_scheduler)
>  			drm_sched_fini(&ring->sched);
>  		del_timer_sync(&ring->fence_drv.fallback_timer);
> +	}
> +}
> +
> +void amdgpu_fence_driver_fini_late(struct amdgpu_device *adev)
> +{
> +	unsigned int i, j;
> +
> +	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
> +		struct amdgpu_ring *ring = adev->rings[i];
> +
> +		if (!ring || !ring->fence_drv.initialized)
> +			continue;
> +
>  		for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
>  			dma_fence_put(ring->fence_drv.fences[j]);
>  		kfree(ring->fence_drv.fences);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 300ac73..a833197 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -49,6 +49,7 @@
>  #include <drm/drm_irq.h>
>  #include <drm/drm_vblank.h>
>  #include <drm/amdgpu_drm.h>
> +#include <drm/drm_drv.h>
>  #include "amdgpu.h"
>  #include "amdgpu_ih.h"
>  #include "atom.h"
> @@ -297,6 +298,20 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>  	return 0;
>  }
>  
> +
> +void amdgpu_irq_fini_early(struct amdgpu_device *adev)
> +{
> +	if (adev->irq.installed) {
> +		drm_irq_uninstall(&adev->ddev);
> +		adev->irq.installed = false;
> +		if (adev->irq.msi_enabled)
> +			pci_free_irq_vectors(adev->pdev);
> +
> +		if (!amdgpu_device_has_dc_support(adev))
> +			flush_work(&adev->hotplug_work);
> +	}
> +}
> +
>  /**
>   * amdgpu_irq_fini - shut down interrupt handling
>   *
> @@ -310,15 +325,6 @@ void amdgpu_irq_fini(struct amdgpu_device *adev)
>  {
>  	unsigned i, j;
>  
> -	if (adev->irq.installed) {
> -		drm_irq_uninstall(adev_to_drm(adev));
> -		adev->irq.installed = false;
> -		if (adev->irq.msi_enabled)
> -			pci_free_irq_vectors(adev->pdev);
> -		if (!amdgpu_device_has_dc_support(adev))
> -			flush_work(&adev->hotplug_work);
> -	}
> -
>  	for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
>  		if (!adev->irq.client[i].sources)
>  			continue;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
> index c718e94..718c70f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
> @@ -104,6 +104,7 @@ irqreturn_t amdgpu_irq_handler(int irq, void *arg);
>  
>  int amdgpu_irq_init(struct amdgpu_device *adev);
>  void amdgpu_irq_fini(struct amdgpu_device *adev);
> +void amdgpu_irq_fini_early(struct amdgpu_device *adev);
>  int amdgpu_irq_add_id(struct amdgpu_device *adev,
>  		      unsigned client_id, unsigned src_id,
>  		      struct amdgpu_irq_src *source);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index a0af8a7..9e30c5c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -29,6 +29,7 @@
>  #include "amdgpu.h"
>  #include <drm/drm_debugfs.h>
>  #include <drm/amdgpu_drm.h>
> +#include <drm/drm_drv.h>
>  #include "amdgpu_sched.h"
>  #include "amdgpu_uvd.h"
>  #include "amdgpu_vce.h"
> @@ -94,7 +95,7 @@ void amdgpu_driver_unload_kms(struct drm_device *dev)
>  	}
>  
>  	amdgpu_acpi_fini(adev);
> -	amdgpu_device_fini(adev);
> +	amdgpu_device_fini_early(adev);
>  }
>  
>  void amdgpu_register_gpu_instance(struct amdgpu_device *adev)
> @@ -1147,6 +1148,15 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
>  	pm_runtime_put_autosuspend(dev->dev);
>  }
>  
> +
> +void amdgpu_driver_release_kms(struct drm_device *dev)
> +{
> +	struct amdgpu_device *adev = drm_to_adev(dev);
> +
> +	amdgpu_device_fini_late(adev);
> +	pci_set_drvdata(adev->pdev, NULL);
> +}
> +
>  /*
>   * VBlank related functions.
>   */
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 9d11b84..caf828a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -2142,9 +2142,12 @@ int amdgpu_ras_pre_fini(struct amdgpu_device *adev)
>  {
>  	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
>  
> +	//DRM_ERROR("adev 0x%llx", (long long unsigned int)adev);
> +
>  	if (!con)
>  		return 0;
>  
> +
>  	/* Need disable ras on all IPs here before ip [hw/sw]fini */
>  	amdgpu_ras_disable_all_features(adev, 0);
>  	amdgpu_ras_recovery_fini(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> index 7112137..074f36b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> @@ -107,7 +107,8 @@ struct amdgpu_fence_driver {
>  };
>  
>  int amdgpu_fence_driver_init(struct amdgpu_device *adev);
> -void amdgpu_fence_driver_fini(struct amdgpu_device *adev);
> +void amdgpu_fence_driver_fini_early(struct amdgpu_device *adev);
> +void amdgpu_fence_driver_fini_late(struct amdgpu_device *adev);
>  void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring);
>  
>  int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
> -- 
> 2.7.4
> 

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