drm/amdgpu: Add gmc interface to request NPS mode

Add a common interface in GMC to request NPS mode through PSP. Also add
a variable in hive and gmc control to track the last requested mode.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

@@ -1235,3 +1235,19 @@ err:
 
 	return ret;
 }
+
+int amdgpu_gmc_request_memory_partition(struct amdgpu_device *adev,
+					int nps_mode)
+{
+	/* Not supported on VF devices and APUs */
+	if (amdgpu_sriov_vf(adev) || (adev->flags & AMD_IS_APU))
+		return -EOPNOTSUPP;
+
+	if (!adev->psp.funcs) {
+		dev_err(adev->dev,
+			"PSP interface not available for nps mode change request");
+		return -EINVAL;
+	}
+
+	return psp_memory_partition(&adev->psp, nps_mode);
+}

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h

@@ -161,6 +161,9 @@ struct amdgpu_gmc_funcs {
 
 	enum amdgpu_memory_partition (*query_mem_partition_mode)(
 		struct amdgpu_device *adev);
+	/* Request NPS mode */
+	int (*request_mem_partition_mode)(struct amdgpu_device *adev,
+					  int nps_mode);
 };
 
 struct amdgpu_xgmi_ras {
@@ -304,6 +307,7 @@ struct amdgpu_gmc {
 	struct amdgpu_mem_partition_info *mem_partitions;
 	uint8_t num_mem_partitions;
 	const struct amdgpu_gmc_funcs	*gmc_funcs;
+	enum amdgpu_memory_partition	requested_nps_mode;
 
 	struct amdgpu_xgmi xgmi;
 	struct amdgpu_irq_src	ecc_irq;
@@ -454,4 +458,6 @@ int amdgpu_gmc_get_nps_memranges(struct amdgpu_device *adev,
 				 struct amdgpu_mem_partition_info *mem_ranges,
 				 int exp_ranges);
 
+int amdgpu_gmc_request_memory_partition(struct amdgpu_device *adev,
+					int nps_mode);
 #endif

drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c

@@ -667,6 +667,7 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
 	task_barrier_init(&hive->tb);
 	hive->pstate = AMDGPU_XGMI_PSTATE_UNKNOWN;
 	hive->hi_req_gpu = NULL;
+	atomic_set(&hive->requested_nps_mode, UNKNOWN_MEMORY_PARTITION_MODE);
 
 	/*
 	 * hive pstate on boot is high in vega20 so we have to go to low

drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h

@@ -46,6 +46,7 @@ struct amdgpu_hive_info {
 	atomic_t ras_recovery;
 	struct ras_event_manager event_mgr;
 	struct work_struct reset_on_init_work;
+	atomic_t requested_nps_mode;
 };
 
 struct amdgpu_pcs_ras_field {