[src/trunk]: src/sys/external/bsd/drm2/include/linux Implement Linux asynchro...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2afa1a74c1b8
branches:  trunk
changeset: 835044:2afa1a74c1b8
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 07:24:54 2018 +0000

description:
Implement Linux asynchronous firmware load API.

diffstat:

 sys/external/bsd/drm2/include/linux/firmware.h |  85 +++++++++++++++++++++++++-
 1 files changed, 84 insertions(+), 1 deletions(-)

diffs (117 lines):

diff -r be424139dced -r 2afa1a74c1b8 sys/external/bsd/drm2/include/linux/firmware.h
--- a/sys/external/bsd/drm2/include/linux/firmware.h    Mon Aug 27 07:24:44 2018 +0000
+++ b/sys/external/bsd/drm2/include/linux/firmware.h    Mon Aug 27 07:24:54 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: firmware.h,v 1.7 2018/08/27 06:43:24 riastradh Exp $   */
+/*     $NetBSD: firmware.h,v 1.8 2018/08/27 07:24:54 riastradh Exp $   */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -35,10 +35,15 @@
 #include <sys/types.h>
 #include <sys/device.h>
 #include <sys/kmem.h>
+#include <sys/module.h>
 #include <sys/systm.h>
 
 #include <dev/firmload.h>
 
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+
 struct device;
 
 struct firmware {
@@ -46,6 +51,15 @@
        size_t                  size;
 };
 
+struct firmload_work {
+       char            *flw_name;
+       void            (*flw_callback)(const struct firmware *, void *);
+       void            *flw_cookie;
+       struct device   *flw_device;
+       struct module   *flw_module;
+       struct work_struct flw_work;
+};
+
 static inline int
 request_firmware(const struct firmware **fwp, const char *image_name,
     struct device *dev)
@@ -92,6 +106,75 @@
 }
 
 static inline void
+request_firmware_work(struct work_struct *wk)
+{
+       struct firmload_work *work = container_of(wk, struct firmload_work,
+           flw_work);
+       const struct firmware *fw;
+       int ret;
+
+       /* Reqeust the firmware.  If it failed, set it to NULL.  */
+       ret = request_firmware(&fw, work->flw_name, work->flw_device);
+       if (ret)
+               fw = NULL;
+
+       /* Call the callback. */
+       (*work->flw_callback)(fw, work->flw_cookie);
+
+       /*
+        * Release the device and module references now that we're
+        * done.
+        *
+        * XXX Heh. What if the module gets unloaded _during_
+        * module_rele because it went to zero?
+        */
+       /* XXX device_release */
+       if (work->flw_module)
+               module_rele(work->flw_module);
+}
+
+static inline int
+request_firmware_nowait(struct module *module, bool uevent, const char *name,
+    struct device *device, gfp_t gfp, void *cookie,
+    void (*callback)(const struct firmware *, void *))
+{
+       char *namedup;
+       struct firmload_work *work;
+
+       /* Allocate memory for it, or fail if we can't.  */
+       work = kzalloc(sizeof(*work), gfp);
+       if (work == NULL)
+               goto fail0;
+
+       /* Copy the name just in case.  */
+       namedup = kstrdup(name, gfp);
+       if (namedup == NULL)
+               goto fail1;
+
+       /* Hold the module and device so they don't go away before callback. */
+       if (module)
+               module_hold(module);
+       /* XXX device_acquire(device) */
+
+       /* Initialize the work.  */
+       work->flw_name = namedup;
+       work->flw_callback = callback;
+       work->flw_cookie = callback;
+       work->flw_device = device;
+       work->flw_module = module;
+       INIT_WORK(&work->flw_work, request_firmware_work);
+
+       /* Kick it off.  */
+       schedule_work(&work->flw_work);
+
+       /* Success!  */
+       return 0;
+
+fail1: kfree(work);
+fail0: return -ENOMEM;
+}
+
+static inline void
 release_firmware(const struct firmware *fw)
 {