[Mesa-dev] [PATCH 6/6] winsys/radeon: add guard pages when R600_DEBUG=check_vm is enabled

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

This should help flush out GPU VM faults.
---
 src/gallium/winsys/radeon/drm/radeon_drm_bo.c     | 4 +++-
 src/gallium/winsys/radeon/drm/radeon_drm_winsys.c | 4 +++-
 src/gallium/winsys/radeon/drm/radeon_drm_winsys.h | 1 +
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
index 2c10e2e..58b52a4 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
@@ -555,8 +555,10 @@ static struct radeon_bo *radeon_create_bo(struct radeon_drm_winsys *rws,
 
     if (rws->info.has_virtual_memory) {
         struct drm_radeon_gem_va va;
+        unsigned va_gap_size;
 
-        bo->va = radeon_bomgr_find_va(rws, size, alignment);
+        va_gap_size = rws->check_vm ? MAX2(4 * alignment, 64 * 1024) : 0;
+        bo->va = radeon_bomgr_find_va(rws, size + va_gap_size, alignment);
 
         va.handle = bo->handle;
         va.vm_id = 0;
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_winsys.c b/src/gallium/winsys/radeon/drm/radeon_drm_winsys.c
index 1f296f4..625ea8a 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_winsys.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_winsys.c
@@ -527,6 +527,8 @@ static boolean do_winsys_init(struct radeon_drm_winsys *ws)
 				     (ws->info.family == CHIP_HAWAII &&
 				      ws->accel_working2 < 3);
 
+    ws->check_vm = strstr(debug_get_option("R600_DEBUG", ""), "check_vm") != NULL;
+
     return TRUE;
 }
 
@@ -742,7 +744,7 @@ radeon_drm_winsys_create(int fd, radeon_screen_create_t screen_create)
     if (!do_winsys_init(ws))
         goto fail1;
 
-    pb_cache_init(&ws->bo_cache, 500000, 2.0f, 0,
+    pb_cache_init(&ws->bo_cache, 500000, ws->check_vm ? 1.0f : 2.0f, 0,
                   MIN2(ws->info.vram_size, ws->info.gart_size),
                   radeon_bo_destroy,
                   radeon_bo_can_reclaim);
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_winsys.h b/src/gallium/winsys/radeon/drm/radeon_drm_winsys.h
index c429aba..fdbaebe 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_winsys.h
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_winsys.h
@@ -91,6 +91,7 @@ struct radeon_drm_winsys {
 
     uint64_t va_offset;
     struct list_head va_holes;
+    bool check_vm;
 
     struct radeon_surface_manager *surf_man;
 
-- 
2.7.4