From 3f2c3255ff61a58382c5a9ade34c950b92fa2a10 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Thu, 21 Sep 2023 16:15:16 +0200 Subject: [PATCH 014/196] drm/amd/display: Move the memory allocation out of dcn20_validate_bandwidth_fp(). 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. Link: https://lore.kernel.org/r/20230921141516.520471-6-bigeasy@linutronix.de Signed-off-by: Sebastian Andrzej Siewior --- .../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 d587f807dfd7..5036a3e60832 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 89d4e969cfd8..68970d6cf031 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 @@ -2018,7 +2018,7 @@ 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; @@ -2027,7 +2027,6 @@ 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(); @@ -2062,16 +2061,14 @@ 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; @@ -2090,11 +2087,11 @@ 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 || @@ -2106,7 +2103,8 @@ 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 a81a0b9e6884..b6c34198ddc8 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); -- 2.43.2