[PATCH v1 2/3] drm/amd/pm: send the SMT-enable message to pmfw

[Wenyou Yang]

When the CPU SMT status change in the fly, sent the SMT-enable
message to pmfw to notify it that the SMT status changed.

Signed-off-by: Wenyou Yang <WenYou.Yang at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c     | 41 +++++++++++++++++++
 drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h |  5 +++
 2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index b5d64749990e..5cd85a9d149d 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -22,6 +22,7 @@
 
 #define SWSMU_CODE_LAYER_L1
 
+#include <linux/cpu.h>
 #include <linux/firmware.h>
 #include <linux/pci.h>
 
@@ -69,6 +70,14 @@ static int smu_set_fan_speed_rpm(void *handle, uint32_t speed);
 static int smu_set_gfx_cgpg(struct smu_context *smu, bool enabled);
 static int smu_set_mp1_state(void *handle, enum pp_mp1_state mp1_state);
 
+static int smt_notifier_callback(struct notifier_block *nb, unsigned long action, void *data);
+
+extern struct raw_notifier_head smt_notifier_head;
+
+static struct notifier_block smt_notifier = {
+	.notifier_call = smt_notifier_callback,
+};
+
 static int smu_sys_get_pp_feature_mask(void *handle,
 				       char *buf)
 {
@@ -625,6 +634,8 @@ static int smu_set_funcs(struct amdgpu_device *adev)
 	return 0;
 }
 
+static struct smu_context *current_smu;
+
 static int smu_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -645,6 +656,7 @@ static int smu_early_init(void *handle)
 	mutex_init(&smu->message_lock);
 
 	adev->powerplay.pp_handle = smu;
+	current_smu = smu;
 	adev->powerplay.pp_funcs = &swsmu_pm_funcs;
 
 	r = smu_set_funcs(adev);
@@ -1105,6 +1117,8 @@ static int smu_sw_init(void *handle)
 	if (!smu->ppt_funcs->get_fan_control_mode)
 		smu->adev->pm.no_fan = true;
 
+	raw_notifier_chain_register(&smt_notifier_head, &smt_notifier);
+
 	return 0;
 }
 
@@ -1122,6 +1136,8 @@ static int smu_sw_fini(void *handle)
 
 	smu_fini_microcode(smu);
 
+	raw_notifier_chain_unregister(&smt_notifier_head, &smt_notifier);
+
 	return 0;
 }
 
@@ -3241,3 +3257,28 @@ int smu_send_hbm_bad_channel_flag(struct smu_context *smu, uint32_t size)
 
 	return ret;
 }
+
+static int smu_set_cpu_smt_enable(struct smu_context *smu, bool enable)
+{
+	int ret = -EINVAL;
+
+	if (smu->ppt_funcs && smu->ppt_funcs->set_cpu_smt_enable)
+		ret = smu->ppt_funcs->set_cpu_smt_enable(smu, enable);
+
+	return ret;
+}
+
+static int smt_notifier_callback(struct notifier_block *nb,
+				 unsigned long action, void *data)
+{
+	struct smu_context *smu = current_smu;
+	int ret = NOTIFY_OK;
+
+	ret = (action == SMT_ENABLED) ?
+				smu_set_cpu_smt_enable(smu, true) :
+				smu_set_cpu_smt_enable(smu, false);
+	if (ret)
+		ret = NOTIFY_BAD;
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
index 09469c750a96..7c6594bba796 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
@@ -1354,6 +1354,11 @@ struct pptable_funcs {
 	 * @init_pptable_microcode: Prepare the pptable microcode to upload via PSP
 	 */
 	int (*init_pptable_microcode)(struct smu_context *smu);
+
+	/**
+	 * @set_cpu_smt_enable: Set the CPU SMT status
+	 */
+	int (*set_cpu_smt_enable)(struct smu_context *smu, bool enable);
 };
 
 typedef enum {
-- 
2.39.2