[PATCH 5/5] drm/amd/display: Move the memory allocation out of dcn20_validate_bandwidth_fp().

[Sebastian Andrzej Siewior]

dcn20_validate_bandwidth_fp() is invoked while FPU access has been
enabled. FPU access requires disabling preemption even on PREEMPT_RT.
It is not possible to allocate memory with disabled preemption even with
GFP_ATOMIC on PREEMPT_RT.

Move the memory allocation before FPU access is enabled.
To preserve previous "clean" state of "pipes" add a memset() before the
second invocation of dcn20_validate_bandwidth_internal() where the
variable is used.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
---
 .../drm/amd/display/dc/dcn20/dcn20_resource.c    | 10 +++++++++-
 .../gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c | 16 +++++++---------
 .../gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h |  5 ++---
 3 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index d587f807dfd7c..5036a3e608324 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -2141,9 +2141,17 @@ bool dcn20_validate_bandwidth(struct dc *dc, struct dc_state *context,
 		bool fast_validate)
 {
 	bool voltage_supported;
+	display_e2e_pipe_params_st *pipes;
+
+	pipes = kcalloc(dc->res_pool->pipe_count, sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+	if (!pipes)
+		return false;
+
 	DC_FP_START();
-	voltage_supported = dcn20_validate_bandwidth_fp(dc, context, fast_validate);
+	voltage_supported = dcn20_validate_bandwidth_fp(dc, context, fast_validate, pipes);
 	DC_FP_END();
+
+	kfree(pipes);
 	return voltage_supported;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
index 8b2038162a7e1..2ad92497b9bf2 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
@@ -1923,7 +1923,7 @@ void dcn20_patch_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_st
 }
 
 static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *context,
-		bool fast_validate)
+		bool fast_validate, display_e2e_pipe_params_st *pipes)
 {
 	bool out = false;
 
@@ -1932,7 +1932,6 @@ static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *co
 	int vlevel = 0;
 	int pipe_split_from[MAX_PIPES];
 	int pipe_cnt = 0;
-	display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_ATOMIC);
 	DC_LOGGER_INIT(dc->ctx->logger);
 
 	BW_VAL_TRACE_COUNT();
@@ -1967,16 +1966,14 @@ static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *co
 	out = false;
 
 validate_out:
-	kfree(pipes);
 
 	BW_VAL_TRACE_FINISH();
 
 	return out;
 }
 
-bool dcn20_validate_bandwidth_fp(struct dc *dc,
-				 struct dc_state *context,
-				 bool fast_validate)
+bool dcn20_validate_bandwidth_fp(struct dc *dc, struct dc_state *context,
+				 bool fast_validate, display_e2e_pipe_params_st *pipes)
 {
 	bool voltage_supported = false;
 	bool full_pstate_supported = false;
@@ -1995,11 +1992,11 @@ bool dcn20_validate_bandwidth_fp(struct dc *dc,
 	ASSERT(context != dc->current_state);
 
 	if (fast_validate) {
-		return dcn20_validate_bandwidth_internal(dc, context, true);
+		return dcn20_validate_bandwidth_internal(dc, context, true, pipes);
 	}
 
 	// Best case, we support full UCLK switch latency
-	voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false);
+	voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false, pipes);
 	full_pstate_supported = context->bw_ctx.bw.dcn.clk.p_state_change_support;
 
 	if (context->bw_ctx.dml.soc.dummy_pstate_latency_us == 0 ||
@@ -2011,7 +2008,8 @@ bool dcn20_validate_bandwidth_fp(struct dc *dc,
 	// Fallback: Try to only support G6 temperature read latency
 	context->bw_ctx.dml.soc.dram_clock_change_latency_us = context->bw_ctx.dml.soc.dummy_pstate_latency_us;
 
-	voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false);
+	memset(pipes, 0, dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st));
+	voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false, pipes);
 	dummy_pstate_supported = context->bw_ctx.bw.dcn.clk.p_state_change_support;
 
 	if (voltage_supported && (dummy_pstate_supported || !(context->stream_count))) {
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
index a81a0b9e68842..b6c34198ddc86 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
@@ -61,9 +61,8 @@ void dcn20_update_bounding_box(struct dc *dc,
 			       unsigned int num_states);
 void dcn20_patch_bounding_box(struct dc *dc,
 			      struct _vcs_dpi_soc_bounding_box_st *bb);
-bool dcn20_validate_bandwidth_fp(struct dc *dc,
-				 struct dc_state *context,
-				 bool fast_validate);
+bool dcn20_validate_bandwidth_fp(struct dc *dc, struct dc_state *context,
+				 bool fast_validate, display_e2e_pipe_params_st *pipes);
 void dcn20_fpu_set_wm_ranges(int i,
 			     struct pp_smu_wm_range_sets *ranges,
 			     struct _vcs_dpi_soc_bounding_box_st *loaded_bb);
-- 
2.40.1