egl,dri: Propagate context priority hint to driver->CreateContext

Jump through the layers of abstraction between egl and dri in order to
feed the context priority attribute through to the backend. This
requires us to read the value from the base _egl_context, convert it to
a DRI attribute, parse it again in the generic context creator before
passing it to the driver as a function parameter.

In order to not require us to pass back the actual value of the context
priority after creation, we impose that drivers should report the
available set of priorities during screen setup (and then they may chose
to fail if given an invalid value as that should have been checked at
the user boundary.)

Signed-off-by: Chris Wilson <[email protected]>
Acked-by: Ben Widawsky <[email protected]> # i915/i965
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Eric Engestrom <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 11 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index 31a3040365a..1cff0ddb2de 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -306,6 +306,7 @@ driCreateContextAttribs(__DRIscreen *screen, int api,
     unsigned minor_version = 0;
     uint32_t flags = 0;
     bool notify_reset = false;
+    unsigned priority = __DRI_CTX_PRIORITY_MEDIUM;
 
     assert((num_attribs == 0) || (attribs != NULL));
 
@@ -348,6 +349,9 @@ driCreateContextAttribs(__DRIscreen *screen, int api,
             notify_reset = (attribs[i * 2 + 1]
                             != __DRI_CTX_RESET_NO_NOTIFICATION);
             break;
+	case __DRI_CTX_ATTRIB_PRIORITY:
+	    priority = attribs[i * 2 + 1];
+	    break;
 	default:
 	    /* We can't create a context that satisfies the requirements of an
 	     * attribute that we don't understand.  Return failure.
@@ -451,7 +455,8 @@ driCreateContextAttribs(__DRIscreen *screen, int api,
 
     if (!screen->driver->CreateContext(mesa_api, modes, context,
                                        major_version, minor_version,
-                                       flags, notify_reset, error, shareCtx)) {
+                                       flags, notify_reset, priority,
+                                       error, shareCtx)) {
         free(context);
         return NULL;
     }
diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h
index 25a3ae47a23..ecc2a475073 100644
--- a/src/mesa/drivers/dri/common/dri_util.h
+++ b/src/mesa/drivers/dri/common/dri_util.h
@@ -85,11 +85,12 @@ struct __DriverAPIRec {
     GLboolean (*CreateContext)(gl_api api,
                                const struct gl_config *glVis,
                                __DRIcontext *driContextPriv,
-			       unsigned major_version,
-			       unsigned minor_version,
-			       uint32_t flags,
+                               unsigned major_version,
+                               unsigned minor_version,
+                               uint32_t flags,
                                bool notify_reset,
-			       unsigned *error,
+                               unsigned priority,
+                               unsigned *error,
                                void *sharedContextPrivate);
 
     void (*DestroyContext)(__DRIcontext *driContextPriv);