From: Trigger Huang <trigger.huang@amd.com>
Date: Thu, 27 Apr 2017 03:09:31 -0400
Subject: drm/amdgpu: Enable chained IB MCBP support
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Git-commit: 63a7c7487fb20422a4a71d0bfef5ac2a69caaf68
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Support for MCBP/Virtualization in combination with chained IBs is
formal released on firmware feature version #46. So enable it
according to firmware feature version, otherwise, world switch will
hang.

Signed-off-by: Trigger Huang <trigger.huang@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -941,12 +941,6 @@ static int gfx_v8_0_init_microcode(struc
 	cp_hdr = (const struct gfx_firmware_header_v1_0 *)adev->gfx.me_fw->data;
 	adev->gfx.me_fw_version = le32_to_cpu(cp_hdr->header.ucode_version);
 
-	/* chain ib ucode isn't formal released, just disable it by far
-	 * TODO: when ucod ready we should use ucode version to judge if
-	 * chain-ib support or not.
-	 */
-	adev->virt.chained_ib_support = false;
-
 	adev->gfx.me_feature_version = le32_to_cpu(cp_hdr->ucode_feature_version);
 
 	snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_ce.bin", chip_name);
@@ -960,6 +954,17 @@ static int gfx_v8_0_init_microcode(struc
 	adev->gfx.ce_fw_version = le32_to_cpu(cp_hdr->header.ucode_version);
 	adev->gfx.ce_feature_version = le32_to_cpu(cp_hdr->ucode_feature_version);
 
+	/*
+	 * Support for MCBP/Virtualization in combination with chained IBs is
+	 * formal released on feature version #46
+	 */
+	if (adev->gfx.ce_feature_version >= 46 &&
+	    adev->gfx.pfp_feature_version >= 46) {
+		adev->virt.chained_ib_support = true;
+		DRM_INFO("Chained IB support enabled!\n");
+	} else
+		adev->virt.chained_ib_support = false;
+
 	snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_rlc.bin", chip_name);
 	err = request_firmware(&adev->gfx.rlc_fw, fw_name, adev->dev);
 	if (err)