iris: initialize shared screen->vtbl only once
Screen is shared among contexts, other context might be already using
vtbl while another initializes it again.
==45872== Possible data race during write of size 8 at 0x5DDAE78 by thread #549
==45872== Locks held: 1, at address 0x5D1B6F8
==45872== at 0x6D66D91: gen9_init_state (iris_state.c:7816)
==45872== by 0x6BA0A31: iris_create_context (iris_context.c:342)
==45872== by 0x621F390: st_api_create_context (st_manager.c:917)
==45872== by 0x620E6F9: dri_create_context (dri_context.c:163)
==45872== by 0x6A40DB1: driCreateContextAttribs (dri_util.c:480)
==45872== by 0x540B963: dri2_create_context (egl_dri2.c:1583)
==45872== by 0x53FB84E: eglCreateContext (eglapi.c:821)
==45872==
==45872== This conflicts with a previous read of size 8 by thread #544
==45872== Locks held: 1, at address 0x5F6E0E0
==45872== at 0x6CB779E: blorp_alloc_binding_table (iris_blorp.c:167)
==45872== by 0x6CAEF70: blorp_emit_surface_states (blorp_genX_exec.h:1540)
==45872== by 0x6CB67F9: blorp_exec (blorp_genX_exec.h:2016)
==45872== by 0x6CB7AFE: iris_blorp_exec (iris_blorp.c:307)
==45872== by 0x70F5916: try_blorp_blit (blorp_blit.c:2145)
==45872== by 0x70F5FCA: do_blorp_blit (blorp_blit.c:2273)
==45872== by 0x70F778F: blorp_copy (blorp_blit.c:2803)
==45872== by 0x6BB9EB6: iris_copy_region (iris_blit.c:725)
v2: move as genX(init_screen_state) (Lionel)
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7544>
(cherry picked from commit 460287adcadf1c03b13fccd397fcd9d270c4d31d)
diff --git a/.pick_status.json b/.pick_status.json
index bd86a5c..fe67855 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -787,7 +787,7 @@
"description": "iris: initialize shared screen->vtbl only once",
"nominated": true,
"nomination_type": 0,
- "resolution": 0,
+ "resolution": 1,
"master_sha": null,
"because_sha": null
},