[PATCH 11/20] drm/amdgpu:add lock_reset for SRIOV

[Monk Liu]

this lock is used for sriov_gpu_reset, only get this mutex
can run into sriov_gpu_reset.

we have two cases triggers gpu_reset for SRIOV:
1) we have submit timedout and trigger reset voluntarily
2) hypervisor found world switch hang and trigger flr and notify we to
   do gpu reset.

both cases need take care and we need a mutex to protect the consistency of
reset routine.

Change-Id: I37aabccfaef1cde32dc350062a519d32c9d51c02
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 82a70db..ac035ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -99,6 +99,7 @@ void amdgpu_virt_init_setting(struct amdgpu_device *adev)
 	adev->enable_virtual_display = true;
 
 	mutex_init(&adev->virt.lock_kiq);
+	mutex_init(&adev->virt.lock_reset);
 }
 
 uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index 7020ff2..4b05568 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -47,6 +47,7 @@ struct amdgpu_virt {
 	bool chained_ib_support;
 	uint32_t			reg_val_offs;
 	struct mutex			lock_kiq;
+	struct mutex                    lock_reset;
 	struct amdgpu_irq_src		ack_irq;
 	struct amdgpu_irq_src		rcv_irq;
 	struct delayed_work		flr_work;
-- 
2.7.4