drm/amdgpu: Add interface for TOS reload cases

Add interface to check if a different TOS needs to be loaded than the
one which is which is already active on the SOC. Presently the interface
is restricted to specific variants of PSPv13.0.

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

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

@@ -2266,6 +2266,19 @@ bool amdgpu_psp_get_ras_capability(struct psp_context *psp)
 	}
 }
 
+bool amdgpu_psp_tos_reload_needed(struct amdgpu_device *adev)
+{
+	struct psp_context *psp = &adev->psp;
+
+	if (amdgpu_sriov_vf(adev))
+		return false;
+
+	if (psp->funcs && psp->funcs->is_reload_needed)
+		return psp->funcs->is_reload_needed(psp);
+
+	return false;
+}
+
 static int psp_hw_start(struct psp_context *psp)
 {
 	struct amdgpu_device *adev = psp->adev;

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

@@ -139,6 +139,7 @@ struct psp_funcs {
 	int (*fatal_error_recovery_quirk)(struct psp_context *psp);
 	bool (*get_ras_capability)(struct psp_context *psp);
 	bool (*is_aux_sos_load_required)(struct psp_context *psp);
+	bool (*is_reload_needed)(struct psp_context *psp);
 };
 
 struct ta_funcs {
@@ -560,5 +561,6 @@ bool amdgpu_psp_get_ras_capability(struct psp_context *psp);
 
 int psp_config_sq_perfmon(struct psp_context *psp, uint32_t xcp_id,
 	bool core_override_enable, bool reg_override_enable, bool perfmon_override_enable);
+bool amdgpu_psp_tos_reload_needed(struct amdgpu_device *adev);
 
 #endif

drivers/gpu/drm/amd/amdgpu/psp_v13_0.c

@@ -823,6 +823,30 @@ static bool psp_v13_0_is_aux_sos_load_required(struct psp_context *psp)
 	return (pmfw_ver < 0x557300);
 }
 
+static bool psp_v13_0_is_reload_needed(struct psp_context *psp)
+{
+	uint32_t ucode_ver;
+
+	if (!psp_v13_0_is_sos_alive(psp))
+		return false;
+
+	/* Restrict reload support only to specific IP versions */
+	switch (amdgpu_ip_version(psp->adev, MP0_HWIP, 0)) {
+	case IP_VERSION(13, 0, 2):
+	case IP_VERSION(13, 0, 6):
+	case IP_VERSION(13, 0, 14):
+		/* TOS version read from microcode header */
+		ucode_ver = psp->sos.fw_version;
+		/* Read TOS version from hardware */
+		psp_v13_0_init_sos_version(psp);
+		return (ucode_ver != psp->sos.fw_version);
+	default:
+		return false;
+	}
+
+	return false;
+}
+
 static const struct psp_funcs psp_v13_0_funcs = {
 	.init_microcode = psp_v13_0_init_microcode,
 	.wait_for_bootloader = psp_v13_0_wait_for_bootloader_steady_state,
@@ -847,6 +871,7 @@ static const struct psp_funcs psp_v13_0_funcs = {
 	.fatal_error_recovery_quirk = psp_v13_0_fatal_error_recovery_quirk,
 	.get_ras_capability = psp_v13_0_get_ras_capability,
 	.is_aux_sos_load_required = psp_v13_0_is_aux_sos_load_required,
+	.is_reload_needed = psp_v13_0_is_reload_needed,
 };
 
 void psp_v13_0_set_psp_funcs(struct psp_context *psp)