[PATCH 8/9] drm/amdgpu: Check APU supports true APP mode

[Alex Deucher]

From: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>

On GPXIP 9.4.3 APU, in no carveout mode there is no real vram heap and
could be emulated by the driver over the interleaved NUMA system memory
and the APU could also  be in the carveout mode during early development
stage or otherwise for debugging purpose so introduce a new member in
amdgpu_gmc to figure out whether the APU is in the native mode as per
the production configuration. AMD_IS_APU cannot be used for Accelerated
Processing Platform APUs as it might be used in a different context on
previous generations or on small APUs.

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Tested-by: Graham Sider <graham.sider at amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h |  1 +
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 5c1d68bec0be..88649701b30e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -250,6 +250,7 @@ struct amdgpu_gmc {
 	uint64_t		last_fault:AMDGPU_GMC_FAULT_RING_ORDER;
 
 	bool tmz_enabled;
+	bool is_app_apu;
 
 	const struct amdgpu_gmc_funcs	*gmc_funcs;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 016adcfe8c49..1a43276de338 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1424,6 +1424,20 @@ static int gmc_v9_0_early_init(void *handle)
 			adev->smuio.funcs->is_host_gpu_xgmi_supported(adev);
 	}
 
+	if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 3)) {
+		enum amdgpu_pkg_type pkg_type =
+			adev->smuio.funcs->get_pkg_type(adev);
+		/* On GFXIP 9.4.3. APU, there is no physical VRAM domain present
+		 * and the APU, can be in used two possible modes:
+		 *  - carveout mode
+		 *  - native APU mode
+		 * "is_app_apu" can be used to identify the APU in the native
+		 * mode.
+		 */
+		adev->gmc.is_app_apu = (pkg_type == AMDGPU_PKG_TYPE_APU &&
+					!pci_resource_len(adev->pdev, 0));
+	}
+
 	gmc_v9_0_set_gmc_funcs(adev);
 	gmc_v9_0_set_irq_funcs(adev);
 	gmc_v9_0_set_umc_funcs(adev);
-- 
2.39.2