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drm/amdgpu: add gang submit backend v2

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Allows submitting jobs as gang which needs to run on multiple
engines at the same time.

Basic idea is that we have a global gang submit fence representing when the
gang leader is finally pushed to run on the hardware last.

Jobs submitted as gang are never re-submitted in case of a GPU reset since this
won't work and will just deadlock the hardware immediately again.

v2: fix logic inversion, improve documentation, fix rcu

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2022-03-02 16:26:53 +01:00
committed by Alex Deucher
parent c05d789fed
commit 68ce8b2422
4 changed files with 67 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@@ -3511,6 +3511,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
adev->gmc.gart_size = 512 * 1024 * 1024;
adev->accel_working = false;
adev->num_rings = 0;
RCU_INIT_POINTER(adev->gang_submit, dma_fence_get_stub());
adev->mman.buffer_funcs = NULL;
adev->mman.buffer_funcs_ring = NULL;
adev->vm_manager.vm_pte_funcs = NULL;
@@ -3992,6 +3993,7 @@ void amdgpu_device_fini_sw(struct amdgpu_device *adev)
release_firmware(adev->firmware.gpu_info_fw);
adev->firmware.gpu_info_fw = NULL;
adev->accel_working = false;
dma_fence_put(rcu_dereference_protected(adev->gang_submit, true));
amdgpu_reset_fini(adev);
@@ -5960,3 +5962,36 @@ void amdgpu_device_pcie_port_wreg(struct amdgpu_device *adev,
(void)RREG32(data);
spin_unlock_irqrestore(&adev->pcie_idx_lock, flags);
}
/**
* amdgpu_device_switch_gang - switch to a new gang
* @adev: amdgpu_device pointer
* @gang: the gang to switch to
*
* Try to switch to a new gang.
* Returns: NULL if we switched to the new gang or a reference to the current
* gang leader.
*/
struct dma_fence *amdgpu_device_switch_gang(struct amdgpu_device *adev,
struct dma_fence *gang)
{
struct dma_fence *old = NULL;
do {
dma_fence_put(old);
rcu_read_lock();
old = dma_fence_get_rcu_safe(&adev->gang_submit);
rcu_read_unlock();
if (old == gang)
break;
if (!dma_fence_is_signaled(old))
return old;
} while (cmpxchg((struct dma_fence __force **)&adev->gang_submit,
old, gang) != old);
dma_fence_put(old);
return NULL;
}