[src/trunk]: src/sys/external/bsd/drm2/dist/drm/nouveau Convert nouveau clk t...

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

details:   https://anonhg.NetBSD.org/src/rev/3790348105ec
branches:  trunk
changeset: 835142:3790348105ec
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 07:43:06 2018 +0000

description:
Convert nouveau clk to condition variables.

Not totally sure that the activity in nvkm_pstate_work that must
happen atomically with wakeup is kosher under a spin lock, but we'll
see.

diffstat:

 sys/external/bsd/drm2/dist/drm/nouveau/include/nvkm/subdev/clk.h                      |   7 +-
 sys/external/bsd/drm2/dist/drm/nouveau/nvkm/subdev/clk/nouveau_nvkm_subdev_clk_base.c |  37 ++++++++-
 2 files changed, 39 insertions(+), 5 deletions(-)

diffs (112 lines):

diff -r ab83373087cc -r 3790348105ec sys/external/bsd/drm2/dist/drm/nouveau/include/nvkm/subdev/clk.h
--- a/sys/external/bsd/drm2/dist/drm/nouveau/include/nvkm/subdev/clk.h  Mon Aug 27 07:42:55 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/nouveau/include/nvkm/subdev/clk.h  Mon Aug 27 07:43:06 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: clk.h,v 1.2 2018/08/27 04:58:30 riastradh Exp $        */
+/*     $NetBSD: clk.h,v 1.3 2018/08/27 07:43:06 riastradh Exp $        */
 
 #ifndef __NVKM_CLK_H__
 #define __NVKM_CLK_H__
@@ -83,7 +83,12 @@
        int state_nr;
 
        struct work_struct work;
+#ifdef __NetBSD__
+       drm_waitqueue_t wait;
+       spinlock_t lock;
+#else
        wait_queue_head_t wait;
+#endif
        atomic_t waiting;
 
        struct nvkm_notify pwrsrc_ntfy;
diff -r ab83373087cc -r 3790348105ec sys/external/bsd/drm2/dist/drm/nouveau/nvkm/subdev/clk/nouveau_nvkm_subdev_clk_base.c
--- a/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/subdev/clk/nouveau_nvkm_subdev_clk_base.c     Mon Aug 27 07:42:55 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/subdev/clk/nouveau_nvkm_subdev_clk_base.c     Mon Aug 27 07:43:06 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nouveau_nvkm_subdev_clk_base.c,v 1.2 2018/08/27 04:58:33 riastradh Exp $       */
+/*     $NetBSD: nouveau_nvkm_subdev_clk_base.c,v 1.3 2018/08/27 07:43:06 riastradh Exp $       */
 
 /*
  * Copyright 2013 Red Hat Inc.
@@ -24,7 +24,7 @@
  * Authors: Ben Skeggs
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_clk_base.c,v 1.2 2018/08/27 04:58:33 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_clk_base.c,v 1.3 2018/08/27 07:43:06 riastradh Exp $");
 
 #include "priv.h"
 
@@ -212,8 +212,12 @@
        struct nvkm_subdev *subdev = &clk->subdev;
        int pstate;
 
-       if (!atomic_xchg(&clk->waiting, 0))
+       spin_lock(&clk->lock);
+       if (!atomic_xchg(&clk->waiting, 0)) {
+               spin_unlock(&clk->lock);
                return;
+       }
+
        clk->pwrsrc = power_supply_is_system_supplied();
 
        nvkm_trace(subdev, "P %d PWR %d U(AC) %d U(DC) %d A %d T %d D %d\n",
@@ -238,7 +242,12 @@
                }
        }
 
+#ifdef __NetBSD__
+       DRM_SPIN_WAKEUP_ALL(&clk->wait, &clk->lock);
+#else
        wake_up_all(&clk->wait);
+#endif
+       spin_unlock(&clk->lock);
        nvkm_notify_get(&clk->pwrsrc_ntfy);
 }
 
@@ -247,8 +256,18 @@
 {
        atomic_set(&clk->waiting, 1);
        schedule_work(&clk->work);
-       if (wait)
+       if (wait) {
+#ifdef __NetBSD__
+               int ret;
+               spin_lock(&clk->lock);
+               DRM_SPIN_WAIT_NOINTR_UNTIL(ret, &clk->wait, &clk->lock,
+                   !atomic_read(&clk->waiting));
+               spin_unlock(&clk->lock);
+               KASSERT(ret == 0);
+#else
                wait_event(clk->wait, !atomic_read(&clk->waiting));
+#endif
+       }
        return 0;
 }
 
@@ -546,6 +565,11 @@
                nvkm_pstate_del(pstate);
        }
 
+#ifdef __NetBSD__
+       DRM_DESTROY_WAITQUEUE(&clk->wait);
+       spin_lock_destroy(&clk->lock);
+#endif
+
        return clk;
 }
 
@@ -572,7 +596,12 @@
        clk->allow_reclock = allow_reclock;
 
        INIT_WORK(&clk->work, nvkm_pstate_work);
+#ifdef __NetBSD__
+       spin_lock_init(&clk->lock);
+       DRM_INIT_WAITQUEUE(&clk->wait, "nvclk");
+#else
        init_waitqueue_head(&clk->wait);
+#endif
        atomic_set(&clk->waiting, 0);
 
        /* If no pstates are provided, try and fetch them from the BIOS */