summaryrefslogtreecommitdiffstats
path: root/src/gallium/winsys/svga
diff options
context:
space:
mode:
authorThomas Hellstrom <[email protected]>2019-03-26 21:36:04 +0100
committerThomas Hellstrom <[email protected]>2019-05-02 09:50:22 +0200
commit50e58966fac906b85401b196ca0e997fc2259ecf (patch)
treeb7de42db7c29d170c43c71a823ae24157acc0dec /src/gallium/winsys/svga
parent492e8288485484f414e1144aeb73ee3eb58b71b1 (diff)
winsys/svga: Add an environment variable to force host-backed operation
The vmwgfx kernel module has a compatibility mode for user-space that is not guest-backed resource aware. Add an environment variable to facilitate testing of this mode on guest-backed aware kernels: if the environment variable SVGA_FORCE_HOST_BACKED is defined, the driver will use host-backed operation. Signed-off-by: Thomas Hellstrom <[email protected]> Reviewed-by: Deepak Rawat <[email protected]> Reviewed-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/gallium/winsys/svga')
-rw-r--r--src/gallium/winsys/svga/drm/vmw_screen_ioctl.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/src/gallium/winsys/svga/drm/vmw_screen_ioctl.c b/src/gallium/winsys/svga/drm/vmw_screen_ioctl.c
index 0ec8c1abe11..cdfe284c4c8 100644
--- a/src/gallium/winsys/svga/drm/vmw_screen_ioctl.c
+++ b/src/gallium/winsys/svga/drm/vmw_screen_ioctl.c
@@ -967,6 +967,7 @@ vmw_ioctl_init(struct vmw_winsys_screen *vws)
drmVersionPtr version;
boolean drm_gb_capable;
boolean have_drm_2_5;
+ const char *getenv_val;
VMW_FUNC;
@@ -1006,17 +1007,21 @@ vmw_ioctl_init(struct vmw_winsys_screen *vws)
goto out_no_3d;
}
vws->ioctl.hwversion = gp_arg.value;
-
- memset(&gp_arg, 0, sizeof(gp_arg));
- gp_arg.param = DRM_VMW_PARAM_HW_CAPS;
- ret = drmCommandWriteRead(vws->ioctl.drm_fd, DRM_VMW_GET_PARAM,
- &gp_arg, sizeof(gp_arg));
+ getenv_val = getenv("SVGA_FORCE_HOST_BACKED");
+ if (!getenv_val || strcmp(getenv_val, "0") == 0) {
+ memset(&gp_arg, 0, sizeof(gp_arg));
+ gp_arg.param = DRM_VMW_PARAM_HW_CAPS;
+ ret = drmCommandWriteRead(vws->ioctl.drm_fd, DRM_VMW_GET_PARAM,
+ &gp_arg, sizeof(gp_arg));
+ } else {
+ ret = -EINVAL;
+ }
if (ret)
vws->base.have_gb_objects = FALSE;
else
vws->base.have_gb_objects =
!!(gp_arg.value & (uint64_t) SVGA_CAP_GBOBJECTS);
-
+
if (vws->base.have_gb_objects && !drm_gb_capable)
goto out_no_3d;