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

Andrey Grodzovsky <Andrey.Grodzovsky@xxxxxxx> · Tue, 24 Nov 2020 10:51:57 -0500

On 11/24/20 9:53 AM, Daniel Vetter wrote:
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


Definitely, and I put it in a TODO list in the RFC patch.Also, as I mentioned 
before -
I just prefer to leave it for a follow up work because it's non trivial and 
requires shuffling
a lof of stuff around in the driver. I was thinking of committing the work in 
incremental steps -
so it's easier to merge it and control for breakages.

Andrey



Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
---
  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

_______________________________________________
amd-gfx mailing list
amd-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/amd-gfx






