drm/amdgpu: add sysfs node for compute partition mode

Add current/available compute partitin mode sysfs node.

v2: make the sysfs node as IP independent one in amdgpu_gfx.c
Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3634,6 +3634,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	mutex_init(&adev->srbm_mutex);
 	mutex_init(&adev->gfx.pipe_reserve_mutex);
 	mutex_init(&adev->gfx.gfx_off_mutex);
+	mutex_init(&adev->gfx.partition_mutex);
 	mutex_init(&adev->grbm_idx_mutex);
 	mutex_init(&adev->mn_lock);
 	mutex_init(&adev->virt.vf_errors.lock);

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

@@ -1174,3 +1174,135 @@ bool amdgpu_gfx_is_master_xcc(struct amdgpu_device *adev, int xcc_id)
 	return !(xcc_id % (adev->gfx.num_xcc_per_xcp ?
 			adev->gfx.num_xcc_per_xcp : 1));
 }
+
+static ssize_t amdgpu_gfx_get_current_compute_partition(struct device *dev,
+						struct device_attribute *addr,
+						char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	enum amdgpu_gfx_partition mode;
+	char *partition_mode;
+
+	mode = adev->gfx.funcs->query_partition_mode(adev);
+
+	switch (mode) {
+	case AMDGPU_SPX_PARTITION_MODE:
+		partition_mode = "SPX";
+		break;
+	case AMDGPU_DPX_PARTITION_MODE:
+		partition_mode = "DPX";
+		break;
+	case AMDGPU_TPX_PARTITION_MODE:
+		partition_mode = "TPX";
+		break;
+	case AMDGPU_QPX_PARTITION_MODE:
+		partition_mode = "QPX";
+		break;
+	case AMDGPU_CPX_PARTITION_MODE:
+		partition_mode = "CPX";
+		break;
+	default:
+		partition_mode = "UNKNOWN";
+		break;
+	}
+
+	return sysfs_emit(buf, "%s\n", partition_mode);
+}
+
+static ssize_t amdgpu_gfx_set_compute_partition(struct device *dev,
+						struct device_attribute *addr,
+						const char *buf, size_t count)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	enum amdgpu_gfx_partition mode;
+	int ret;
+
+	if (adev->gfx.num_xcd % 2 != 0)
+		return -EINVAL;
+
+	if (!strncasecmp("SPX", buf, strlen("SPX"))) {
+		mode = AMDGPU_SPX_PARTITION_MODE;
+	} else if (!strncasecmp("DPX", buf, strlen("DPX"))) {
+		if (adev->gfx.num_xcd != 4 || adev->gfx.num_xcd != 8)
+			return -EINVAL;
+		mode = AMDGPU_DPX_PARTITION_MODE;
+	} else if (!strncasecmp("TPX", buf, strlen("TPX"))) {
+		if (adev->gfx.num_xcd != 6)
+			return -EINVAL;
+		mode = AMDGPU_TPX_PARTITION_MODE;
+	} else if (!strncasecmp("QPX", buf, strlen("QPX"))) {
+		if (adev->gfx.num_xcd != 8)
+			return -EINVAL;
+		mode = AMDGPU_QPX_PARTITION_MODE;
+	} else if (!strncasecmp("CPX", buf, strlen("CPX"))) {
+		mode = AMDGPU_CPX_PARTITION_MODE;
+	} else {
+		return -EINVAL;
+	}
+
+	mutex_lock(&adev->gfx.partition_mutex);
+
+	ret = adev->gfx.funcs->switch_partition_mode(adev, mode);
+
+	mutex_unlock(&adev->gfx.partition_mutex);
+
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static ssize_t amdgpu_gfx_get_available_compute_partition(struct device *dev,
+						struct device_attribute *addr,
+						char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	char *supported_partition;
+
+	/* TBD */
+	switch (adev->gfx.num_xcd) {
+	case 8:
+		supported_partition = "SPX, DPX, QPX, CPX";
+		break;
+	case 6:
+		supported_partition = "SPX, TPX, CPX";
+		break;
+	case 4:
+		supported_partition = "SPX, DPX, CPX";
+		break;
+	/* this seems only existing in emulation phase */
+	case 2:
+		supported_partition = "SPX, CPX";
+		break;
+	default:
+		supported_partition = "Not supported";
+		break;
+	}
+
+	return sysfs_emit(buf, "%s\n", supported_partition);
+}
+
+static DEVICE_ATTR(current_compute_partition, S_IRUGO | S_IWUSR,
+		   amdgpu_gfx_get_current_compute_partition,
+		   amdgpu_gfx_set_compute_partition);
+
+static DEVICE_ATTR(available_compute_partition, S_IRUGO,
+		   amdgpu_gfx_get_available_compute_partition, NULL);
+
+int amdgpu_gfx_sysfs_init(struct amdgpu_device *adev)
+{
+	int r;
+
+	r = device_create_file(adev->dev, &dev_attr_current_compute_partition);
+	if (r)
+		return r;
+
+	r = device_create_file(adev->dev, &dev_attr_available_compute_partition);
+	if (r)
+		return r;
+
+	return 0;
+}

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

@@ -259,6 +259,10 @@ struct amdgpu_gfx_funcs {
 	void (*update_perfmon_mgcg)(struct amdgpu_device *adev, bool enable);
 	int (*get_gfx_shadow_info)(struct amdgpu_device *adev,
 				   struct amdgpu_gfx_shadow_info *shadow_info);
+	enum amdgpu_gfx_partition
+			(*query_partition_mode)(struct amdgpu_device *adev);
+	int (*switch_partition_mode)(struct amdgpu_device *adev,
+				     enum amdgpu_gfx_partition mode);
 };
 
 struct sq_work {
@@ -394,6 +398,7 @@ struct amdgpu_gfx {
 	enum amdgpu_gfx_partition	partition_mode;
 	uint32_t			num_xcd;
 	uint32_t			num_xcc_per_xcp;
+	struct mutex			partition_mutex;
 };
 
 #define amdgpu_gfx_get_gpu_clock_counter(adev) (adev)->gfx.funcs->get_gpu_clock_counter((adev))
@@ -478,4 +483,5 @@ int amdgpu_gfx_poison_consumption_handler(struct amdgpu_device *adev,
 						struct amdgpu_iv_entry *entry);
 
 bool amdgpu_gfx_is_master_xcc(struct amdgpu_device *adev, int xcc_id);
+int amdgpu_gfx_sysfs_init(struct amdgpu_device *adev);
 #endif

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

@@ -95,6 +95,9 @@ struct amdgpu_nbio_funcs {
 	void (*apply_l1_link_width_reconfig_wa)(struct amdgpu_device *adev);
 	void (*clear_doorbell_interrupt)(struct amdgpu_device *adev);
 	u32 (*get_rom_offset)(struct amdgpu_device *adev);
+	u32 (*get_compute_partition_mode)(struct amdgpu_device *adev);
+	void (*set_compute_partition_mode)(struct amdgpu_device *adev,
+					   enum amdgpu_gfx_partition mode);
 };
 
 struct amdgpu_nbio {

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

@@ -662,6 +662,67 @@ static void gfx_v9_4_3_select_me_pipe_q(struct amdgpu_device *adev,
 	soc15_grbm_select(adev, me, pipe, q, vm, 0);
 }
 
+static enum amdgpu_gfx_partition
+gfx_v9_4_3_query_compute_partition(struct amdgpu_device *adev)
+{
+	enum amdgpu_gfx_partition mode = AMDGPU_UNKNOWN_COMPUTE_PARTITION_MODE;
+
+	if (adev->nbio.funcs->get_compute_partition_mode)
+		mode = adev->nbio.funcs->get_compute_partition_mode(adev);
+
+	return mode;
+}
+
+static int gfx_v9_4_3_switch_compute_partition(struct amdgpu_device *adev,
+						enum amdgpu_gfx_partition mode)
+{
+	u32 tmp = 0;
+	int num_xcc_per_partition, i;
+
+	if (mode == adev->gfx.partition_mode)
+		return mode;
+
+	switch (mode) {
+	case AMDGPU_SPX_PARTITION_MODE:
+		num_xcc_per_partition = adev->gfx.num_xcd;
+		break;
+	case AMDGPU_DPX_PARTITION_MODE:
+		num_xcc_per_partition = adev->gfx.num_xcd / 2;
+		break;
+	case AMDGPU_TPX_PARTITION_MODE:
+		num_xcc_per_partition = adev->gfx.num_xcd / 3;
+		break;
+	case AMDGPU_QPX_PARTITION_MODE:
+		num_xcc_per_partition = adev->gfx.num_xcd / 4;
+		break;
+	case AMDGPU_CPX_PARTITION_MODE:
+		num_xcc_per_partition = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* TODO:
+	 * Stop user queues and threads, and make sure GPU is empty of work.
+	 */
+
+	for (i = 0; i < adev->gfx.num_xcd; i++) {
+		tmp = REG_SET_FIELD(tmp, CP_HYP_XCP_CTL, NUM_XCC_IN_XCP,
+				    num_xcc_per_partition);
+		tmp = REG_SET_FIELD(tmp, CP_HYP_XCP_CTL, VIRTUAL_XCC_ID,
+				    i % num_xcc_per_partition);
+		WREG32_SOC15(GC, i, regCP_HYP_XCP_CTL, tmp);
+	}
+
+	if (adev->nbio.funcs->set_compute_partition_mode)
+		adev->nbio.funcs->set_compute_partition_mode(adev, mode);
+
+	adev->gfx.num_xcc_per_xcp = num_xcc_per_partition;
+	adev->gfx.partition_mode = mode;
+
+	return 0;
+}
+
 static const struct amdgpu_gfx_funcs gfx_v9_4_3_gfx_funcs = {
 	.get_gpu_clock_counter = &gfx_v9_4_3_get_gpu_clock_counter,
 	.select_se_sh = &gfx_v9_4_3_select_se_sh,
@@ -669,6 +730,8 @@ static const struct amdgpu_gfx_funcs gfx_v9_4_3_gfx_funcs = {
 	.read_wave_sgprs = &gfx_v9_4_3_read_wave_sgprs,
 	.read_wave_vgprs = &gfx_v9_4_3_read_wave_vgprs,
 	.select_me_pipe_q = &gfx_v9_4_3_select_me_pipe_q,
+	.query_partition_mode = &gfx_v9_4_3_query_compute_partition,
+	.switch_partition_mode = &gfx_v9_4_3_switch_compute_partition,
 };
 
 static int gfx_v9_4_3_gpu_early_init(struct amdgpu_device *adev)
@@ -858,6 +921,10 @@ static int gfx_v9_4_3_sw_init(void *handle)
 	if (r)
 		return r;
 
+	r = amdgpu_gfx_sysfs_init(adev);
+	if (r)
+		return r;
+
 	return 0;
 }
 

drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c

@@ -347,6 +347,36 @@ static void nbio_v7_9_enable_doorbell_interrupt(struct amdgpu_device *adev,
 			      DOORBELL_INTERRUPT_DISABLE, enable ? 0 : 1);
 }
 
+static enum amdgpu_gfx_partition nbio_v7_9_get_compute_partition_mode(struct amdgpu_device *adev)
+{
+	u32 tmp;
+
+	tmp = RREG32_SOC15(NBIO, 0, regBIF_BX_PF0_PARTITION_COMPUTE_CAP);
+
+	if (REG_GET_FIELD(tmp, BIF_BX_PF0_PARTITION_COMPUTE_CAP, SPX_SUPPORT))
+		return AMDGPU_SPX_PARTITION_MODE;
+	else if (REG_GET_FIELD(tmp, BIF_BX_PF0_PARTITION_COMPUTE_CAP, DPX_SUPPORT))
+		return AMDGPU_DPX_PARTITION_MODE;
+	else if (REG_GET_FIELD(tmp, BIF_BX_PF0_PARTITION_COMPUTE_CAP, TPX_SUPPORT))
+		return AMDGPU_TPX_PARTITION_MODE;
+	else if (REG_GET_FIELD(tmp, BIF_BX_PF0_PARTITION_COMPUTE_CAP, CPX_SUPPORT))
+		return AMDGPU_CPX_PARTITION_MODE;
+	else
+		return AMDGPU_UNKNOWN_COMPUTE_PARTITION_MODE;
+}
+
+static void nbio_v7_9_set_compute_partition_mode(struct amdgpu_device *adev,
+					enum amdgpu_gfx_partition mode)
+{
+	u32 tmp;
+
+	tmp = RREG32_SOC15(NBIO, 0, regBIF_BX_PF0_PARTITION_COMPUTE_CAP);
+	tmp &= ~0x1f;
+	tmp |= 1 << mode;
+
+	WREG32_SOC15(NBIO, 0, regBIF_BX_PF0_PARTITION_COMPUTE_CAP, tmp);
+}
+
 const struct amdgpu_nbio_funcs nbio_v7_9_funcs = {
 	.get_hdp_flush_req_offset = nbio_v7_9_get_hdp_flush_req_offset,
 	.get_hdp_flush_done_offset = nbio_v7_9_get_hdp_flush_done_offset,
@@ -366,4 +396,6 @@ const struct amdgpu_nbio_funcs nbio_v7_9_funcs = {
 	.get_clockgating_state = nbio_v7_9_get_clockgating_state,
 	.ih_control = nbio_v7_9_ih_control,
 	.remap_hdp_registers = nbio_v7_9_remap_hdp_registers,
+	.get_compute_partition_mode = nbio_v7_9_get_compute_partition_mode,
+	.set_compute_partition_mode = nbio_v7_9_set_compute_partition_mode,
 };