drm/amdgpu: partially revert "reduce reset time"

This partially reverts commit 194eb17.

This commit introduced a new state variable into adev without even
remotely worrying about CPU barriers.

Since we already have the amdgpu_in_reset() function exactly for this
use case partially revert that.

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>

Author: ChristianKoenigAMD

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1175,7 +1175,6 @@ struct amdgpu_device {
 
 	struct work_struct		reset_work;
 
-	bool                            job_hang;
 	bool                            dc_enabled;
 	/* Mask of active clusters */
 	uint32_t			aid_mask;

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

@@ -836,7 +836,7 @@ int amdgpu_amdkfd_unmap_hiq(struct amdgpu_device *adev, u32 doorbell_off,
 	if (!kiq->pmf || !kiq->pmf->kiq_unmap_queues)
 		return -EINVAL;
 
-	if (!kiq_ring->sched.ready || adev->job_hang)
+	if (!kiq_ring->sched.ready || amdgpu_in_reset(adev))
 		return 0;
 
 	ring_funcs = kzalloc(sizeof(*ring_funcs), GFP_KERNEL);

drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c

@@ -515,7 +515,7 @@ int amdgpu_gfx_disable_kcq(struct amdgpu_device *adev, int xcc_id)
 	if (!kiq->pmf || !kiq->pmf->kiq_unmap_queues)
 		return -EINVAL;
 
-	if (!kiq_ring->sched.ready || adev->job_hang || amdgpu_in_reset(adev))
+	if (!kiq_ring->sched.ready || amdgpu_in_reset(adev))
 		return 0;
 
 	spin_lock(&kiq->ring_lock);
@@ -567,7 +567,7 @@ int amdgpu_gfx_disable_kgq(struct amdgpu_device *adev, int xcc_id)
 	if (!kiq->pmf || !kiq->pmf->kiq_unmap_queues)
 		return -EINVAL;
 
-	if (!adev->gfx.kiq[0].ring.sched.ready || adev->job_hang)
+	if (!adev->gfx.kiq[0].ring.sched.ready || amdgpu_in_reset(adev))
 		return 0;
 
 	if (amdgpu_gfx_is_master_xcc(adev, xcc_id)) {

drivers/gpu/drm/amd/amdgpu/amdgpu_job.c

@@ -102,8 +102,6 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 		return DRM_GPU_SCHED_STAT_ENODEV;
 	}
 
-	adev->job_hang = true;
-
 	/*
 	 * Do the coredump immediately after a job timeout to get a very
 	 * close dump/snapshot/representation of GPU's current error status
@@ -181,7 +179,6 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 	}
 
 exit:
-	adev->job_hang = false;
 	drm_dev_exit(idx);
 	return DRM_GPU_SCHED_STAT_NOMINAL;
 }

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -5957,7 +5957,7 @@ static int gfx_v10_0_cp_gfx_enable(struct amdgpu_device *adev, bool enable)
 	else
 		WREG32_SOC15(GC, 0, mmCP_ME_CNTL, tmp);
 
-	if (adev->job_hang && !enable)
+	if (amdgpu_in_reset(adev) && !enable)
 		return 0;
 
 	for (i = 0; i < adev->usec_timeout; i++) {