crocus: fix scratch_bos memory leak

This change is inspired from iris_destroy_context().

For instance, this issue is triggered with
"piglit/bin/glsl-1.50-gs-max-output -scan 1 20 -auto -fbo":
Direct leak of 320 byte(s) in 2 object(s) allocated from:
    #0 0x7f34fc769987 in calloc (/usr/lib64/libasan.so.6+0xb1987)
    android-rpi#1 0x7f34f4fa168a in bo_calloc ../src/gallium/drivers/crocus/crocus_bufmgr.c:288
    android-rpi#2 0x7f34f4fa168a in alloc_fresh_bo ../src/gallium/drivers/crocus/crocus_bufmgr.c:350
    android-rpi#3 0x7f34f4fa168a in bo_alloc_internal ../src/gallium/drivers/crocus/crocus_bufmgr.c:419
    #4 0x7f34f4fe50a9 in crocus_get_scratch_space ../src/gallium/drivers/crocus/crocus_program.c:2678
    #5 0x7f34f55e8954 in crocus_upload_dirty_render_state ../src/gallium/drivers/crocus/crocus_state.c:6871
    #6 0x7f34f55e8954 in crocus_upload_render_state ../src/gallium/drivers/crocus/crocus_state.c:7812
    #7 0x7f34f5d9f680 in crocus_simple_draw_vbo ../src/gallium/drivers/crocus/crocus_draw.c:332
    #8 0x7f34f5d9f680 in crocus_draw_vbo ../src/gallium/drivers/crocus/crocus_draw.c:438
    #9 0x7f34f1d2eeba in tc_call_draw_single ../src/gallium/auxiliary/util/u_threaded_context.c:3735
    #10 0x7f34f1d12e03 in batch_execute ../src/gallium/auxiliary/util/u_threaded_context.c:394
    #11 0x7f34f1d12e03 in tc_batch_execute ../src/gallium/auxiliary/util/u_threaded_context.c:445
    #12 0x7f34f1d22c9a in _tc_sync ../src/gallium/auxiliary/util/u_threaded_context.c:680
    #13 0x7f34f1d238f8 in tc_texture_map ../src/gallium/auxiliary/util/u_threaded_context.c:2754
    #14 0x7f34f120b9d9 in pipe_texture_map_3d ../src/gallium/auxiliary/util/u_inlines.h:579
    #15 0x7f34f120b9d9 in st_ReadPixels ../src/mesa/state_tracker/st_cb_readpixels.c:530
    #16 0x7f34f10d7355 in read_pixels ../src/mesa/main/readpix.c:1178
    #17 0x7f34f10d7355 in _mesa_ReadnPixelsARB ../src/mesa/main/readpix.c:1195
    #18 0x7f34f10d7e10 in _mesa_ReadPixels ../src/mesa/main/readpix.c:1210

Fixes: f363054 ("f3630548f1da crocus: initial gallium driver for Intel gfx 4-7")
Signed-off-by: Patrick Lerda <[email protected]>
Reviewed-by: Filip Gawin <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23019>
(cherry picked from commit 6ee0bba)

Author: Patrick Lerda

.pick_status.json

@@ -2380,7 +2380,7 @@
         "description": "crocus: fix scratch_bos memory leak",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "f3630548f1da904ec6c63b43ece7e68afdb8867e"
     },

src/gallium/drivers/crocus/crocus_context.c

@@ -194,6 +194,12 @@ crocus_destroy_context(struct pipe_context *ctx)
    if (ice->blitter)
       util_blitter_destroy(ice->blitter);
    screen->vtbl.destroy_state(ice);
+
+   for (unsigned i = 0; i < ARRAY_SIZE(ice->shaders.scratch_bos); i++) {
+      for (unsigned j = 0; j < ARRAY_SIZE(ice->shaders.scratch_bos[i]); j++)
+         crocus_bo_unreference(ice->shaders.scratch_bos[i][j]);
+   }
+
    crocus_destroy_program_cache(ice);
    u_upload_destroy(ice->query_buffer_uploader);