[PATCH 4/5] drm/amdgpu: revert context to stop engine before mode2 reset

[Victor Zhao]

For some hang caused by slow tests, engine cannot be stopped which
may cause resume failure after reset. In this case, force halt
engine by reverting context addresses

Signed-off-by: Victor Zhao <Victor.Zhao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c  |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h  |  1 +
 drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c    | 36 +++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c |  2 ++
 4 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 5498fda8617f..833dc5e224d3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5037,6 +5037,7 @@ static void amdgpu_device_recheck_guilty_jobs(
 
 			/* set guilty */
 			drm_sched_increase_karma(s_job);
+			amdgpu_reset_prepare_hwcontext(adev, reset_context);
 retry:
 			/* do hw reset */
 			if (amdgpu_sriov_vf(adev)) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h
index f8036f2b100e..c7b44aeb671b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h
@@ -37,6 +37,7 @@ struct amdgpu_gfxhub_funcs {
 	void (*utcl2_harvest)(struct amdgpu_device *adev);
 	void (*mode2_save_regs)(struct amdgpu_device *adev);
 	void (*mode2_restore_regs)(struct amdgpu_device *adev);
+	void (*halt)(struct amdgpu_device *adev);
 };
 
 struct amdgpu_gfxhub {
diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
index 51cf8acd2d79..8cf53e039c11 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
@@ -646,6 +646,41 @@ static void gfxhub_v2_1_restore_regs(struct amdgpu_device *adev)
 	WREG32_SOC15(GC, 0, mmGCMC_VM_MX_L1_TLB_CNTL, adev->gmc.MC_VM_MX_L1_TLB_CNTL);
 }
 
+static void gfxhub_v2_1_halt(struct amdgpu_device *adev)
+{
+	struct amdgpu_vmhub *hub = &adev->vmhub[AMDGPU_GFXHUB_0];
+	int i;
+	uint32_t tmp;
+	int time = 1000;
+
+	gfxhub_v2_1_set_fault_enable_default(adev, false);
+
+	for (i = 0; i <= 14; i++) {
+		WREG32_SOC15_OFFSET(GC, 0, mmGCVM_CONTEXT1_PAGE_TABLE_START_ADDR_LO32,
+				    i * hub->ctx_addr_distance, ~0);
+		WREG32_SOC15_OFFSET(GC, 0, mmGCVM_CONTEXT1_PAGE_TABLE_START_ADDR_HI32,
+				    i * hub->ctx_addr_distance, ~0);
+		WREG32_SOC15_OFFSET(GC, 0, mmGCVM_CONTEXT1_PAGE_TABLE_END_ADDR_LO32,
+				    i * hub->ctx_addr_distance,
+				    0);
+		WREG32_SOC15_OFFSET(GC, 0, mmGCVM_CONTEXT1_PAGE_TABLE_END_ADDR_HI32,
+				    i * hub->ctx_addr_distance,
+				    0);
+	}
+	tmp = RREG32_SOC15(GC, 0, mmGRBM_STATUS2);
+	while ((tmp & (GRBM_STATUS2__EA_BUSY_MASK |
+		      GRBM_STATUS2__EA_LINK_BUSY_MASK)) != 0 &&
+	       time) {
+		udelay(100);
+		time--;
+		tmp = RREG32_SOC15(GC, 0, mmGRBM_STATUS2);
+	}
+
+	if (!time) {
+		DRM_WARN("failed to wait for GRBM(EA) idle\n");
+	}
+}
+
 const struct amdgpu_gfxhub_funcs gfxhub_v2_1_funcs = {
 	.get_fb_location = gfxhub_v2_1_get_fb_location,
 	.get_mc_fb_offset = gfxhub_v2_1_get_mc_fb_offset,
@@ -658,4 +693,5 @@ const struct amdgpu_gfxhub_funcs gfxhub_v2_1_funcs = {
 	.utcl2_harvest = gfxhub_v2_1_utcl2_harvest,
 	.mode2_save_regs = gfxhub_v2_1_save_regs,
 	.mode2_restore_regs = gfxhub_v2_1_restore_regs,
+	.halt = gfxhub_v2_1_halt,
 };
diff --git a/drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c b/drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c
index 51a5b68f77d3..fead7251292f 100644
--- a/drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c
+++ b/drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c
@@ -97,6 +97,8 @@ sienna_cichlid_mode2_prepare_hwcontext(struct amdgpu_reset_control *reset_ctl,
 	if (!amdgpu_sriov_vf(adev)) {
 		if (adev->gfxhub.funcs->mode2_save_regs)
 			adev->gfxhub.funcs->mode2_save_regs(adev);
+		if (adev->gfxhub.funcs->halt)
+			adev->gfxhub.funcs->halt(adev);
 		r = sienna_cichlid_mode2_suspend_ip(adev);
 	}
 
-- 
2.25.1