[PATCH v4 07/14] drm/amdgpu: Register IOMMU topology notifier per device.
Andrey Grodzovsky
Andrey.Grodzovsky at amd.com
Wed Jan 20 19:38:12 UTC 2021
Ping
Andrey
On 1/20/21 12:01 AM, Andrey Grodzovsky wrote:
>
> On 1/19/21 3:48 AM, Christian König wrote:
>> Am 18.01.21 um 22:01 schrieb Andrey Grodzovsky:
>>> Handle all DMA IOMMU gropup related dependencies before the
>>> group is removed.
>>>
>>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 5 ++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 46
>>> ++++++++++++++++++++++++++++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h | 1 +
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 10 +++++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 2 ++
>>> 6 files changed, 65 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> index 478a7d8..2953420 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> @@ -51,6 +51,7 @@
>>> #include <linux/dma-fence.h>
>>> #include <linux/pci.h>
>>> #include <linux/aer.h>
>>> +#include <linux/notifier.h>
>>> #include <drm/ttm/ttm_bo_api.h>
>>> #include <drm/ttm/ttm_bo_driver.h>
>>> @@ -1041,6 +1042,10 @@ struct amdgpu_device {
>>> bool in_pci_err_recovery;
>>> struct pci_saved_state *pci_state;
>>> +
>>> + struct notifier_block nb;
>>> + struct blocking_notifier_head notifier;
>>> + struct list_head device_bo_list;
>>> };
>>> static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> index 45e23e3..e99f4f1 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> @@ -70,6 +70,8 @@
>>> #include <drm/task_barrier.h>
>>> #include <linux/pm_runtime.h>
>>> +#include <linux/iommu.h>
>>> +
>>> MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
>>> MODULE_FIRMWARE("amdgpu/vega12_gpu_info.bin");
>>> MODULE_FIRMWARE("amdgpu/raven_gpu_info.bin");
>>> @@ -3200,6 +3202,39 @@ static const struct attribute
>>> *amdgpu_dev_attributes[] = {
>>> };
>>> +static int amdgpu_iommu_group_notifier(struct notifier_block *nb,
>>> + unsigned long action, void *data)
>>> +{
>>> + struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, nb);
>>> + struct amdgpu_bo *bo = NULL;
>>> +
>>> + /*
>>> + * Following is a set of IOMMU group dependencies taken care of before
>>> + * device's IOMMU group is removed
>>> + */
>>> + if (action == IOMMU_GROUP_NOTIFY_DEL_DEVICE) {
>>> +
>>> + spin_lock(&ttm_bo_glob.lru_lock);
>>> + list_for_each_entry(bo, &adev->device_bo_list, bo) {
>>> + if (bo->tbo.ttm)
>>> + ttm_tt_unpopulate(bo->tbo.bdev, bo->tbo.ttm);
>>> + }
>>> + spin_unlock(&ttm_bo_glob.lru_lock);
>>
>> That approach won't work. ttm_tt_unpopulate() might sleep on an IOMMU lock.
>>
>> You need to use a mutex here or even better make sure you can access the
>> device_bo_list without a lock in this moment.
>>
>> Christian.
>
>
> I can think of switching to RCU list ? Otherwise, elements are added
> on BO create and deleted on BO destroy, how can i prevent any of those from
> happening while in this section besides mutex ? Make a copy list and run over
> it instead ?
>
> Andrey
>
>
>>
>>> +
>>> + if (adev->irq.ih.use_bus_addr)
>>> + amdgpu_ih_ring_fini(adev, &adev->irq.ih);
>>> + if (adev->irq.ih1.use_bus_addr)
>>> + amdgpu_ih_ring_fini(adev, &adev->irq.ih1);
>>> + if (adev->irq.ih2.use_bus_addr)
>>> + amdgpu_ih_ring_fini(adev, &adev->irq.ih2);
>>> +
>>> + amdgpu_gart_dummy_page_fini(adev);
>>> + }
>>> +
>>> + return NOTIFY_OK;
>>> +}
>>> +
>>> +
>>> /**
>>> * amdgpu_device_init - initialize the driver
>>> *
>>> @@ -3304,6 +3339,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>>> INIT_WORK(&adev->xgmi_reset_work, amdgpu_device_xgmi_reset_func);
>>> + INIT_LIST_HEAD(&adev->device_bo_list);
>>> +
>>> adev->gfx.gfx_off_req_count = 1;
>>> adev->pm.ac_power = power_supply_is_system_supplied() > 0;
>>> @@ -3575,6 +3612,15 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>>> if (amdgpu_device_cache_pci_state(adev->pdev))
>>> pci_restore_state(pdev);
>>> + BLOCKING_INIT_NOTIFIER_HEAD(&adev->notifier);
>>> + adev->nb.notifier_call = amdgpu_iommu_group_notifier;
>>> +
>>> + if (adev->dev->iommu_group) {
>>> + r = iommu_group_register_notifier(adev->dev->iommu_group, &adev->nb);
>>> + if (r)
>>> + goto failed;
>>> + }
>>> +
>>> return 0;
>>> failed:
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
>>> index 0db9330..486ad6d 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
>>> @@ -92,7 +92,7 @@ static int amdgpu_gart_dummy_page_init(struct
>>> amdgpu_device *adev)
>>> *
>>> * Frees the dummy page used by the driver (all asics).
>>> */
>>> -static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
>>> +void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
>>> {
>>> if (!adev->dummy_page_addr)
>>> return;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h
>>> index afa2e28..5678d9c 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.h
>>> @@ -61,6 +61,7 @@ int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev);
>>> void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev);
>>> int amdgpu_gart_init(struct amdgpu_device *adev);
>>> void amdgpu_gart_fini(struct amdgpu_device *adev);
>>> +void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev);
>>> int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
>>> int pages);
>>> int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> index 6cc9919..4a1de69 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> @@ -94,6 +94,10 @@ static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo)
>>> }
>>> amdgpu_bo_unref(&bo->parent);
>>> + spin_lock(&ttm_bo_glob.lru_lock);
>>> + list_del(&bo->bo);
>>> + spin_unlock(&ttm_bo_glob.lru_lock);
>>> +
>>> kfree(bo->metadata);
>>> kfree(bo);
>>> }
>>> @@ -613,6 +617,12 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
>>> if (bp->type == ttm_bo_type_device)
>>> bo->flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
>>> + INIT_LIST_HEAD(&bo->bo);
>>> +
>>> + spin_lock(&ttm_bo_glob.lru_lock);
>>> + list_add_tail(&bo->bo, &adev->device_bo_list);
>>> + spin_unlock(&ttm_bo_glob.lru_lock);
>>> +
>>> return 0;
>>> fail_unreserve:
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> index 9ac3756..5ae8555 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> @@ -110,6 +110,8 @@ struct amdgpu_bo {
>>> struct list_head shadow_list;
>>> struct kgd_mem *kfd_bo;
>>> +
>>> + struct list_head bo;
>>> };
>>> static inline struct amdgpu_bo *ttm_to_amdgpu_bo(struct
>>> ttm_buffer_object *tbo)
>>
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