From: Shaoyun Liu <Shaoyun.Liu@amd.com>
Date: Thu, 1 Feb 2018 17:37:50 -0500
Subject: drm/amdgpu: Basic emulation support
Git-commit: bfca02892773d2702aeeec9a290cf99464c3c0c1
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Add amdgpu_emu_mode module parameter to control the emulation mode
Avoid vbios operation on emulation since there is no vbios post duirng emulation,
use the common hw_init to simulate the post

Signed-off-by: Shaoyun Liu <Shaoyun.Liu@amd.com>
Acked-By: Alex Deucher <alexander.deucher@amd.com>
Acked-By: Christian Konig <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/amdgpu.h        |    1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |   26 +++++++++++++++++++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |    4 ++++
 3 files changed, 28 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -128,6 +128,7 @@ extern int amdgpu_job_hang_limit;
 extern int amdgpu_lbpw;
 extern int amdgpu_compute_multipipe;
 extern int amdgpu_gpu_recovery;
+extern int amdgpu_emu_mode;
 
 #ifdef CONFIG_DRM_AMDGPU_SI
 extern int amdgpu_si_support;
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1311,6 +1311,20 @@ static int amdgpu_device_ip_init(struct
 			return r;
 		}
 		adev->ip_blocks[i].status.sw = true;
+
+		if (amdgpu_emu_mode == 1) {
+			/* Need to do common hw init first on emulation  */
+			if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_COMMON) {
+				r = adev->ip_blocks[i].version->funcs->hw_init((void *)adev);
+				if (r) {
+					DRM_ERROR("hw_init of IP block <%s> failed %d\n",
+						adev->ip_blocks[i].version->funcs->name, r);
+					return r;
+				}
+				adev->ip_blocks[i].status.hw = true;
+			}
+		}
+
 		/* need to do gmc hw init early so we can allocate gpu mem */
 		if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC) {
 			r = amdgpu_device_vram_scratch_init(adev);
@@ -1344,8 +1358,7 @@ static int amdgpu_device_ip_init(struct
 	for (i = 0; i < adev->num_ip_blocks; i++) {
 		if (!adev->ip_blocks[i].status.sw)
 			continue;
-		/* gmc hw init is done early */
-		if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC)
+		if (adev->ip_blocks[i].status.hw)
 			continue;
 		r = adev->ip_blocks[i].version->funcs->hw_init((void *)adev);
 		if (r) {
@@ -1887,6 +1900,9 @@ int amdgpu_device_init(struct amdgpu_dev
 	if (runtime)
 		vga_switcheroo_init_domain_pm_ops(adev->dev, &adev->vga_pm_domain);
 
+	if (amdgpu_emu_mode == 1)
+		goto fence_driver_init;
+
 	/* Read BIOS */
 	if (!amdgpu_get_bios(adev)) {
 		r = -EINVAL;
@@ -1939,6 +1955,7 @@ int amdgpu_device_init(struct amdgpu_dev
 			amdgpu_atombios_i2c_init(adev);
 	}
 
+fence_driver_init:
 	/* Fence driver */
 	r = amdgpu_fence_driver_init(adev);
 	if (r) {
@@ -2084,7 +2101,10 @@ void amdgpu_device_fini(struct amdgpu_de
 	/* free i2c buses */
 	if (!amdgpu_device_has_dc_support(adev))
 		amdgpu_i2c_fini(adev);
-	amdgpu_atombios_fini(adev);
+
+	if (amdgpu_emu_mode != 1)
+		amdgpu_atombios_fini(adev);
+
 	kfree(adev->bios);
 	adev->bios = NULL;
 	if (!pci_is_thunderbolt_attached(adev->pdev))
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -131,6 +131,7 @@ int amdgpu_job_hang_limit = 0;
 int amdgpu_lbpw = -1;
 int amdgpu_compute_multipipe = -1;
 int amdgpu_gpu_recovery = -1; /* auto */
+int amdgpu_emu_mode = 0;
 
 MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
 module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -286,6 +287,9 @@ module_param_named(compute_multipipe, am
 MODULE_PARM_DESC(gpu_recovery, "Enable GPU recovery mechanism, (1 = enable, 0 = disable, -1 = auto");
 module_param_named(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
 
+MODULE_PARM_DESC(emu_mode, "Emulation mode, (1 = enable, 0 = disable");
+module_param_named(emu_mode, amdgpu_emu_mode, int, 0444);
+
 #ifdef CONFIG_DRM_AMDGPU_SI
 
 #if defined(CONFIG_DRM_RADEON) || defined(CONFIG_DRM_RADEON_MODULE)