drm/amdgpu: Basic emulation support

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>

1 files changed, 23 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 628ed92fe9a2..3c0299bad59c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1310,6 +1310,20 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
                         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);
@@ -1343,8 +1357,7 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
         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) {
@@ -1884,6 +1897,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
         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;
@@ -1936,6 +1952,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
                         amdgpu_atombios_i2c_init(adev);
         }
 
+fence_driver_init:
         /* Fence driver */
         r = amdgpu_fence_driver_init(adev);
         if (r) {
@@ -2078,7 +2095,10 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
         /* 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))