unsigned sample_count,
unsigned bindings)
{
- if (sample_count > 4)
+ if (sample_count > nv30_screen(pscreen)->max_sample_count)
return false;
+
if (!(0x00000017 & (1 << sample_count)))
return false;
return NULL;
}
+ /*
+ * Some modern apps try to use msaa without keeping in mind the
+ * restrictions on videomem of older cards. Resulting in dmesg saying:
+ * [ 1197.850642] nouveau E[soffice.bin[3785]] fail ttm_validate
+ * [ 1197.850648] nouveau E[soffice.bin[3785]] validating bo list
+ * [ 1197.850654] nouveau E[soffice.bin[3785]] validate: -12
+ *
+ * Because we are running out of video memory, after which the program
+ * using the msaa visual freezes, and eventually the entire system freezes.
+ *
+ * To work around this we do not allow msaa visauls by default and allow
+ * the user to override this via NV30_MAX_MSAA.
+ */
+ screen->max_sample_count = debug_get_num_option("NV30_MAX_MSAA", 0);
+ if (screen->max_sample_count > 4)
+ screen->max_sample_count = 4;
+
pscreen = &screen->base.base;
pscreen->destroy = nv30_screen_destroy;
pscreen->get_param = nv30_screen_get_param;