panfrost: Implement context priority on v10

This implement PIPE_CAP_CONTEXT_PRIORITY_MASK and handle priority flags
for v10.

This effectively expose EGL_IMG_context_priority and
EGL_NV_context_priority_realtime.

Expose of what is currently supported from the panthor uAPI.

Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30991>

src/gallium/drivers/panfrost/pan_context.c

@@ -989,6 +989,8 @@ panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
    if (!ctx)
       return NULL;
 
+   ctx->flags = flags;
+
    struct pipe_context *gallium = (struct pipe_context *)ctx;
    struct panfrost_device *dev = pan_device(screen);
 

src/gallium/drivers/panfrost/pan_context.h

@@ -124,6 +124,9 @@ struct panfrost_context {
    /* Gallium context */
    struct pipe_context base;
 
+   /* Context flags */
+   unsigned flags;
+
    /* Dirty global state */
    enum pan_dirty_3d dirty;
 

src/gallium/drivers/panfrost/pan_csf.c

@@ -1024,6 +1024,19 @@ GENX(csf_launch_draw_indirect)(struct panfrost_batch *batch,
 
 #define POSITION_FIFO_SIZE (64 * 1024)
 
+static enum drm_panthor_group_priority
+get_panthor_group_priority(struct panfrost_context *ctx)
+{
+   if (ctx->flags & PIPE_CONTEXT_REALTIME_PRIORITY)
+      return PANTHOR_GROUP_PRIORITY_REALTIME;
+   else if (ctx->flags & PIPE_CONTEXT_HIGH_PRIORITY)
+      return PANTHOR_GROUP_PRIORITY_HIGH;
+   else if (ctx->flags & PIPE_CONTEXT_LOW_PRIORITY)
+      return PANTHOR_GROUP_PRIORITY_LOW;
+
+   return PANTHOR_GROUP_PRIORITY_MEDIUM;
+}
+
 int
 GENX(csf_init_context)(struct panfrost_context *ctx)
 {
@@ -1040,7 +1053,7 @@ GENX(csf_init_context)(struct panfrost_context *ctx)
       .max_compute_cores = util_bitcount64(dev->kmod.props.shader_present),
       .max_fragment_cores = util_bitcount64(dev->kmod.props.shader_present),
       .max_tiler_cores = 1,
-      .priority = PANTHOR_GROUP_PRIORITY_MEDIUM,
+      .priority = get_panthor_group_priority(ctx),
       .queues = DRM_PANTHOR_OBJ_ARRAY(ARRAY_SIZE(qc), qc),
       .vm_id = pan_kmod_vm_handle(dev->kmod.vm),
    };

src/gallium/drivers/panfrost/pan_screen.c

@@ -98,6 +98,27 @@ panfrost_get_device_vendor(struct pipe_screen *screen)
    return "Arm";
 }
 
+static int
+from_kmod_group_allow_priority_flags(
+   enum pan_kmod_group_allow_priority_flags kmod_flags)
+{
+   int flags = 0;
+
+   if (kmod_flags & PAN_KMOD_GROUP_ALLOW_PRIORITY_REALTIME)
+      flags |= PIPE_CONTEXT_PRIORITY_REALTIME;
+
+   if (kmod_flags & PAN_KMOD_GROUP_ALLOW_PRIORITY_HIGH)
+      flags |= PIPE_CONTEXT_PRIORITY_HIGH;
+
+   if (kmod_flags & PAN_KMOD_GROUP_ALLOW_PRIORITY_MEDIUM)
+      flags |= PIPE_CONTEXT_PRIORITY_MEDIUM;
+
+   if (kmod_flags & PAN_KMOD_GROUP_ALLOW_PRIORITY_LOW)
+      flags |= PIPE_CONTEXT_PRIORITY_LOW;
+
+   return flags;
+}
+
 static int
 panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
 {
@@ -377,6 +398,10 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_NATIVE_FENCE_FD:
       return 1;
 
+   case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+      return from_kmod_group_allow_priority_flags(
+         dev->kmod.props.allowed_group_priorities_mask);
+
    case PIPE_CAP_ASTC_DECODE_MODE:
       return dev->arch >= 9 && (dev->compressed_formats & (1 << 30));