drm/amd/display: add max bandwidth budget to QoS interface

[Why]
The QoS reporting interface lacked a field to expose the maximum
active memory bandwidth budget. Adding this field allows callers to
observe the effective bandwidth ceiling.

[How]
Rename struct memory_qos to dc_measured_memory_qos and introduce
a new struct dc_requested_memory_qos holding bandwidth lower bound,
calculated average bandwidth, latency upper bounds, and max bandwidth
budget. Add a get_requested_memory_qos function pointer to
clk_mgr_funcs. Update dc_get_qos_info to call through the new
function pointer and populate all requested QoS fields including
qos_max_bw_budget_in_mbps in dc_qos_info.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

5 files changed, 42 insertions, 15 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 2cb1d1bf0376..92190ea451e8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -7601,7 +7601,8 @@ void dc_log_preos_dmcub_info(const struct dc *dc)
 bool dc_get_qos_info(struct dc *dc, struct dc_qos_info *info)
 {
 	const struct dc_clocks *clk = &dc->current_state->bw_ctx.bw.dcn.clk;
-	struct memory_qos qos;
+	struct dc_measured_memory_qos measured = {};
+	struct dc_requested_memory_qos requested = {};
 
 	memset(info, 0, sizeof(*info));
 
@@ -7610,16 +7611,23 @@ bool dc_get_qos_info(struct dc *dc, struct dc_qos_info *info)
 		return false;
 	}
 
-	// Call unified measurement function
-	dc->hwss.measure_memory_qos(dc, &qos);
+	dc->hwss.measure_memory_qos(dc, &measured);
 
-	// Populate info from measured qos
-	info->actual_peak_bw_in_mbps = qos.peak_bw_mbps;
-	info->actual_avg_bw_in_mbps = qos.avg_bw_mbps;
-	info->actual_min_latency_in_ns = qos.min_latency_ns;
-	info->actual_max_latency_in_ns = qos.max_latency_ns;
-	info->actual_avg_latency_in_ns = qos.avg_latency_ns;
-	info->dcn_bandwidth_ub_in_mbps = (uint32_t)(clk->fclk_khz / 1000 * 64);
+	info->actual_peak_bw_in_mbps    = measured.peak_bw_mbps;
+	info->actual_avg_bw_in_mbps     = measured.avg_bw_mbps;
+	info->actual_min_latency_in_ns  = measured.min_latency_ns;
+	info->actual_max_latency_in_ns  = measured.max_latency_ns;
+	info->actual_avg_latency_in_ns  = measured.avg_latency_ns;
+	info->dcn_bandwidth_ub_in_mbps  = (uint32_t)(clk->fclk_khz / 1000 * 64);
+
+	if (dc->clk_mgr && dc->clk_mgr->funcs->get_requested_memory_qos) {
+		dc->clk_mgr->funcs->get_requested_memory_qos(dc->clk_mgr, &requested);
+		info->qos_bandwidth_lb_in_mbps    = requested.bandwidth_lb_in_mbps;
+		info->calculated_avg_bw_in_mbps   = requested.calculated_avg_bw_in_mbps;
+		info->qos_max_latency_ub_in_ns    = requested.max_latency_ub_in_ns;
+		info->qos_avg_latency_ub_in_ns    = requested.avg_latency_ub_in_ns;
+		info->qos_max_bw_budget_in_mbps   = requested.max_bw_budget_in_mbps;
+	}
 
 	return true;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 73901ac94b7d..757ec9aff0b2 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -971,6 +971,7 @@ struct dc_qos_info {
 	uint32_t actual_avg_latency_in_ns;
 	uint32_t qos_avg_latency_ub_in_ns;
 	uint32_t dcn_bandwidth_ub_in_mbps;
+	uint32_t qos_max_bw_budget_in_mbps;
 };
 
 struct dc_state;
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
index 7f0743de1b14..4b9fcb87e60d 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
@@ -53,7 +53,7 @@ struct drr_params;
 struct dc_underflow_debug_data;
 struct dsc_optc_config;
 struct vm_system_aperture_param;
-struct memory_qos;
+struct dc_measured_memory_qos;
 struct stream_encoder;
 struct hpo_dp_stream_encoder;
 struct hpo_frl_stream_encoder;
@@ -1516,12 +1516,12 @@ struct hw_sequencer_funcs {
 	/**
 	 * measure_memory_qos - Measure memory QoS metrics
 	 * @dc: DC structure
-	 * @qos: Pointer to memory_qos struct to populate with measured values
+	 * @qos: Pointer to dc_measured_memory_qos struct to populate with measured values
 	 *
-	 * Populates the provided memory_qos struct with peak bandwidth, average bandwidth,
+	 * Populates the provided dc_measured_memory_qos struct with peak bandwidth, average bandwidth,
 	 * max latency, min latency, and average latency from hardware performance counters.
 	 */
-	void (*measure_memory_qos)(struct dc *dc, struct memory_qos *qos);
+	void (*measure_memory_qos)(struct dc *dc, struct dc_measured_memory_qos *qos);
 
 };
 
diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
index e960ca9062ad..a99e1937f8ce 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -707,7 +707,7 @@ struct dc_bounding_box_max_clk {
 	int max_phyclk_mhz;
 };
 
-struct memory_qos {
+struct dc_measured_memory_qos {
 	uint32_t peak_bw_mbps;
 	uint32_t avg_bw_mbps;
 	uint32_t max_latency_ns;
@@ -715,4 +715,12 @@ struct memory_qos {
 	uint32_t avg_latency_ns;
 };
 
+struct dc_requested_memory_qos {
+	uint32_t bandwidth_lb_in_mbps;
+	uint32_t calculated_avg_bw_in_mbps;
+	uint32_t max_latency_ub_in_ns;
+	uint32_t avg_latency_ub_in_ns;
+	uint32_t max_bw_budget_in_mbps;
+};
+
 #endif /* _CORE_TYPES_H_ */
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h
index eab25efea76b..dcce81e3d97c 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h
@@ -28,6 +28,7 @@
 #define __DAL_CLK_MGR_H__
 
 #include "dc.h"
+#include "core_types.h"
 #include "dm_pp_smu.h"
 
 /* Constants */
@@ -374,6 +375,15 @@ struct clk_mgr_funcs {
 	unsigned int (*override_memory_bandwidth_request)(
 			struct clk_mgr *clk_mgr,
 			unsigned int bw_kbps);
+	/**
+	 * get_requested_memory_qos - Retrieve current QoS request from the clock manager's
+	 *     current clock state, reflecting any active bandwidth overrides.
+	 * @clk_mgr: clock manager instance
+	 * @qos: pointer to dc_requested_memory_qos structure to populate
+	 */
+	void (*get_requested_memory_qos)(
+			struct clk_mgr *clk_mgr,
+			struct dc_requested_memory_qos *qos);
 };
 
 struct clk_mgr {