From a74300c7ff256b417079134f7bd9aea91153025b Mon Sep 17 00:00:00 2001 From: Timothy Arceri Date: Thu, 18 May 2017 15:00:40 +1000 Subject: [PATCH] mesa: add an env var to force cache fallback MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit For the gallium state tracker a tgsi binary may have been evicted from the cache to make space. In this case we would take the fallback path and recompile/link the shader. On i965 there are a number of reasons we can get to the program upload stage and have neither IR nor a valid cached binary. For example the binary may have been evicted from the cache or we need a variant that wasn't previously cached. This environment variable enables us to force the fallback path that would be taken in these cases and makes it easier to debug these otherwise hard to reproduce scenarios. Reviewed-by: Nicolai Hähnle --- docs/shading.html | 2 ++ src/mesa/main/mtypes.h | 1 + src/mesa/main/shaderapi.c | 2 ++ src/mesa/state_tracker/st_shader_cache.c | 6 +++++- 4 files changed, 10 insertions(+), 1 deletion(-) diff --git a/docs/shading.html b/docs/shading.html index 7e3d2e4..c789102 100644 --- a/docs/shading.html +++ b/docs/shading.html @@ -50,6 +50,8 @@ execution. These are generally used for debugging. The filenames will be "shader_X.vert" or "shader_X.frag" where X the shader ID.
  • cache_info - print debug information about shader cache +
  • cache_fb - force cached shaders to be ignored and do a full + recompile via the fallback path
  • uniform - print message to stdout when glUniform is called
  • nopvert - force vertex shaders to be a simple shader that just transforms the vertex position with ftransform() and passes through the color and diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h index efc6920..d060f8f 100644 --- a/src/mesa/main/mtypes.h +++ b/src/mesa/main/mtypes.h @@ -2977,6 +2977,7 @@ struct gl_shader_program #define GLSL_REPORT_ERRORS 0x40 /**< Print compilation errors */ #define GLSL_DUMP_ON_ERROR 0x80 /**< Dump shaders to stderr on compile error */ #define GLSL_CACHE_INFO 0x100 /**< Print debug information about shader cache */ +#define GLSL_CACHE_FALLBACK 0x200 /**< Force shader cache fallback paths */ /** diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c index 68fb3fa..325542e 100644 --- a/src/mesa/main/shaderapi.c +++ b/src/mesa/main/shaderapi.c @@ -77,6 +77,8 @@ _mesa_get_shader_flags(void) flags |= GLSL_DUMP; if (strstr(env, "log")) flags |= GLSL_LOG; + if (strstr(env, "cache_fb")) + flags |= GLSL_CACHE_FALLBACK; if (strstr(env, "cache_info")) flags |= GLSL_CACHE_INFO; if (strstr(env, "nopvert")) diff --git a/src/mesa/state_tracker/st_shader_cache.c b/src/mesa/state_tracker/st_shader_cache.c index 175d69d..45438e5 100644 --- a/src/mesa/state_tracker/st_shader_cache.c +++ b/src/mesa/state_tracker/st_shader_cache.c @@ -225,8 +225,12 @@ st_load_tgsi_from_disk_cache(struct gl_context *ctx, if (prog->data->LinkStatus != linking_skipped) return false; - struct st_context *st = st_context(ctx); uint8_t *buffer = NULL; + if (ctx->_Shader->Flags & GLSL_CACHE_FALLBACK) { + goto fallback_recompile; + } + + struct st_context *st = st_context(ctx); for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) { if (prog->_LinkedShaders[i] == NULL) continue; -- 2.7.4