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drm/amd/display: Multi display cause system lag on mode change

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[Why]
DCValidator is created/destroyed repeatedly for cofunctional validation
which causes a lot of memory thrashing, particularly when Driver Verifer
is enabled.

[How]
Implement a basic caching algorithm that will cache DCValidator with a
matching topology.  When a match is found, the DCValidator can be
reused.  If there is no match, a new one will be created and inserted
into the cache if there is space or an unreference entry can be evicted.

Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Aric Cyr 2020-08-23 22:32:14 -04:00 • committed by Alex Deucher
parent 48e48e5984
commit e4863f118a
1 changed files with 12 additions and 6 deletions
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18
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -1481,13 +1481,8 @@ bool dc_post_update_surfaces_to_stream(struct dc *dc)
return true; return true;
} }
struct dc_state *dc_create_state(struct dc *dc) static void init_state(struct dc *dc, struct dc_state *context)
{ {
struct dc_state *context = kvzalloc(sizeof(struct dc_state),
GFP_KERNEL);
if (!context)
return NULL;
/* Each context must have their own instance of VBA and in order to /* Each context must have their own instance of VBA and in order to
* initialize and obtain IP and SOC the base DML instance from DC is * initialize and obtain IP and SOC the base DML instance from DC is
* initially copied into every context * initially copied into every context
@ -1495,6 +1490,17 @@ struct dc_state *dc_create_state(struct dc *dc)
#ifdef CONFIG_DRM_AMD_DC_DCN #ifdef CONFIG_DRM_AMD_DC_DCN
memcpy(&context->bw_ctx.dml, &dc->dml, sizeof(struct display_mode_lib)); memcpy(&context->bw_ctx.dml, &dc->dml, sizeof(struct display_mode_lib));
#endif #endif
}
struct dc_state *dc_create_state(struct dc *dc)
{
struct dc_state *context = kzalloc(sizeof(struct dc_state),
GFP_KERNEL);
if (!context)
return NULL;
init_state(dc, context);
kref_init(&context->refcount); kref_init(&context->refcount);