Module Name: src
Committed By: riastradh
Date: Sun Dec 19 01:34:57 UTC 2021
Modified Files:
src/sys/external/bsd/drm2/include/linux: stop_machine.h
src/sys/external/bsd/drm2/linux: files.drmkms_linux
Added Files:
src/sys/external/bsd/drm2/linux: linux_stop_machine.c
Log Message:
Draft stop_machine. Hope the callback runs quickly under splhigh...
To generate a diff of this commit:
cvs rdiff -u -r1.1 -r1.2 \
src/sys/external/bsd/drm2/include/linux/stop_machine.h
cvs rdiff -u -r1.21 -r1.22 src/sys/external/bsd/drm2/linux/files.drmkms_linux
cvs rdiff -u -r0 -r1.1 src/sys/external/bsd/drm2/linux/linux_stop_machine.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/drm2/include/linux/stop_machine.h
diff -u src/sys/external/bsd/drm2/include/linux/stop_machine.h:1.1 src/sys/external/bsd/drm2/include/linux/stop_machine.h:1.2
--- src/sys/external/bsd/drm2/include/linux/stop_machine.h:1.1 Sun Dec 19 00:31:27 2021
+++ src/sys/external/bsd/drm2/include/linux/stop_machine.h Sun Dec 19 01:34:57 2021
@@ -0,0 +1,41 @@
+/* $NetBSD: stop_machine.h,v 1.2 2021/12/19 01:34:57 riastradh Exp $ */
+
+/*-
+ * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Taylor R. Campbell.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_STOP_MACHINE_H_
+#define _LINUX_STOP_MACHINE_H_
+
+#define stop_machine linux_stop_machine
+
+struct kcpuset;
+
+void stop_machine(int (*)(void *), void *, const struct kcpuset *);
+
+#endif /* _LINUX_STOP_MACHINE_H_ */
Index: src/sys/external/bsd/drm2/linux/files.drmkms_linux
diff -u src/sys/external/bsd/drm2/linux/files.drmkms_linux:1.21 src/sys/external/bsd/drm2/linux/files.drmkms_linux:1.22
--- src/sys/external/bsd/drm2/linux/files.drmkms_linux:1.21 Sun Dec 19 01:33:18 2021
+++ src/sys/external/bsd/drm2/linux/files.drmkms_linux Sun Dec 19 01:34:57 2021
@@ -1,4 +1,4 @@
-# $NetBSD: files.drmkms_linux,v 1.21 2021/12/19 01:33:18 riastradh Exp $
+# $NetBSD: files.drmkms_linux,v 1.22 2021/12/19 01:34:57 riastradh Exp $
define drmkms_linux: i2cexec, i2c_bitbang
@@ -17,6 +17,7 @@ file external/bsd/drm2/linux/linux_modul
file external/bsd/drm2/linux/linux_pci.c drmkms_linux
file external/bsd/drm2/linux/linux_reservation.c drmkms_linux
file external/bsd/drm2/linux/linux_srcu.c drmkms_linux
+file external/bsd/drm2/linux/linux_stop_machine.c drmkms_linux
file external/bsd/drm2/linux/linux_wait_bit.c drmkms_linux
file external/bsd/drm2/linux/linux_writecomb.c drmkms_linux
file external/bsd/drm2/linux/linux_ww_mutex.c drmkms_linux
Added files:
Index: src/sys/external/bsd/drm2/linux/linux_stop_machine.c
diff -u /dev/null src/sys/external/bsd/drm2/linux/linux_stop_machine.c:1.1
--- /dev/null Sun Dec 19 01:34:57 2021
+++ src/sys/external/bsd/drm2/linux/linux_stop_machine.c Sun Dec 19 01:34:57 2021
@@ -0,0 +1,90 @@
+/* $NetBSD: linux_stop_machine.c,v 1.1 2021/12/19 01:34:57 riastradh Exp $ */
+
+/*-
+ * Copyright (c) 2018 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Taylor R. Campbell.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: linux_stop_machine.c,v 1.1 2021/12/19 01:34:57 riastradh Exp $");
+
+#include <sys/atomic.h>
+#include <sys/intr.h>
+#include <sys/lock.h>
+#include <sys/systm.h>
+#include <sys/xcall.h>
+
+#include <linux/stop_machine.h>
+
+struct stop_machine {
+ int (*callback)(void *);
+ void *cookie;
+ volatile unsigned ncpu;
+ volatile bool done;
+};
+
+static void
+stop_machine_xcall(void *a, void *b)
+{
+ struct stop_machine *S = a;
+ int s;
+
+ /* Block all activity on this CPU. */
+ s = splhigh();
+
+ /* Note that we're ready, and see whether we're the chosen one. */
+ if (atomic_dec_uint_nv(&S->ncpu) != 0) {
+ /* Not the chosen one. Wait until done. */
+ while (!S->done)
+ SPINLOCK_BACKOFF_HOOK;
+ goto out;
+ }
+
+ /* It's time. Call the callback. */
+ S->callback(S->cookie);
+
+ /* Notify everyone else that we're done. */
+ S->done = true;
+
+ /* Allow activity again. */
+out: splx(s);
+}
+
+void
+stop_machine(int (*callback)(void *), void *cookie, const struct kcpuset *cpus)
+{
+ struct stop_machine stop, *S = &stop;
+
+ KASSERT(cpus == NULL); /* not implemented */
+
+ S->callback = callback;
+ S->cookie = cookie;
+ S->ncpu = ncpu; /* XXX cpu hotplug */
+ S->done = false;
+
+ xc_wait(xc_broadcast(0, stop_machine_xcall, &S, NULL));
+}
