pan/decode: Introduce the concept of usermode queue

This way we allow JUMPs to be decoded when the decode function is
passed an indirect CS buffer that's called from a kernelmode queue.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Antonino Maniscalco <antonino.maniscalco@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26358>

src/panfrost/lib/genxml/decode.h

@@ -41,6 +41,12 @@ struct pandecode_context {
    struct util_dynarray ro_mappings;
    int dump_frame_count;
    simple_mtx_t lock;
+
+   /* On CSF context, set to true if the root CS ring buffer
+    * is managed in userspace. The blob does that, and mesa might use
+    * usermode queues too at some point.
+    */
+   bool usermode_queue;
 };
 
 void pandecode_dump_file_open(struct pandecode_context *ctx);

src/panfrost/lib/genxml/decode_csf.c

@@ -951,6 +951,11 @@ GENX(pandecode_cs)(struct pandecode_context *ctx, mali_ptr queue, uint32_t size,
       .ip = cs,
       .end = cs + (size / 8),
       .gpu_id = gpu_id,
+
+      /* If this is a kernel mode queue, we don't see the root ring buffer and
+       * we must adjust the initial call stack depth accordingly.
+       */
+      .call_stack_depth = ctx->usermode_queue ? 0 : 1,
    };
 
    if (size) {