debug: move all of the debug bits out of the spl

Pull all of the internal debug infrastructure up in to the zfs
code to clean up the layering.  Remove all the dodgy usage of
SET_ERROR and DTRACE_PROBE from the spl.  Luckily it was
lightly used in the spl layer so we're not losing much.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17861

include/os/freebsd/Makefile.am

@@ -44,7 +44,6 @@ noinst_HEADERS = \
 	%D%/spl/sys/procfs_list.h \
 	%D%/spl/sys/random.h \
 	%D%/spl/sys/rwlock.h \
-	%D%/spl/sys/sdt.h \
 	%D%/spl/sys/sid.h \
 	%D%/spl/sys/sig.h \
 	%D%/spl/sys/simd.h \
@@ -63,7 +62,6 @@ noinst_HEADERS = \
 	%D%/spl/sys/time.h \
 	%D%/spl/sys/timer.h \
 	%D%/spl/sys/trace.h \
-	%D%/spl/sys/trace_zfs.h \
 	%D%/spl/sys/types.h \
 	%D%/spl/sys/types32.h \
 	%D%/spl/sys/uio.h \
@@ -82,10 +80,12 @@ noinst_HEADERS = \
 	%D%/zfs/sys/arc_os.h \
 	%D%/zfs/sys/freebsd_crypto.h \
 	%D%/zfs/sys/freebsd_event.h \
+	%D%/zfs/sys/trace_zfs.h \
 	%D%/zfs/sys/vdev_os.h \
 	%D%/zfs/sys/zfs_bootenv_os.h \
 	%D%/zfs/sys/zfs_context_os.h \
 	%D%/zfs/sys/zfs_ctldir.h \
+	%D%/zfs/sys/zfs_debug_os.h \
 	%D%/zfs/sys/zfs_dir.h \
 	%D%/zfs/sys/zfs_ioctl_compat.h \
 	%D%/zfs/sys/zfs_vfsops_os.h \

include/os/freebsd/zfs/sys/zfs_debug_os.h

@@ -27,10 +27,11 @@
  * $FreeBSD$
  */
 
-#ifndef _OPENSOLARIS_SYS_SDT_H_
-#define	_OPENSOLARIS_SYS_SDT_H_
+#ifndef _SYS_ZFS_DEBUG_OS_H
+#define	_SYS_ZFS_DEBUG_OS_H
+
+#include <sys/sdt.h>
 
-#include_next <sys/sdt.h>
 #ifdef KDTRACE_HOOKS
 SDT_PROBE_DECLARE(sdt, , , set__error);
 
@@ -44,4 +45,4 @@ SDT_PROBE_DECLARE(sdt, , , set__error);
 #define	SET_ERROR(err) (err)
 #endif
 
-#endif	/* _OPENSOLARIS_SYS_SDT_H_ */
+#endif	/* _SYS_ZFS_DEBUG_OS_H */

include/os/linux/Makefile.am

@@ -41,6 +41,7 @@ kernel_sys_HEADERS = \
 	%D%/zfs/sys/zfs_bootenv_os.h \
 	%D%/zfs/sys/zfs_context_os.h \
 	%D%/zfs/sys/zfs_ctldir.h \
+	%D%/zfs/sys/zfs_debug_os.h \
 	%D%/zfs/sys/zfs_dir.h \
 	%D%/zfs/sys/zfs_vfsops_os.h \
 	%D%/zfs/sys/zfs_vnops_os.h \
@@ -97,7 +98,6 @@ kernel_spl_sys_HEADERS = \
 	%D%/spl/sys/time.h \
 	%D%/spl/sys/timer.h \
 	%D%/spl/sys/trace.h \
-	%D%/spl/sys/trace_spl.h \
 	%D%/spl/sys/trace_taskq.h \
 	%D%/spl/sys/tsd.h \
 	%D%/spl/sys/types.h \

include/os/linux/spl/sys/sysmacros.h

@@ -34,11 +34,6 @@
 #include <sys/signal.h>
 #include <asm/page.h>
 
-
-#ifndef _KERNEL
-#define	_KERNEL				__KERNEL__
-#endif
-
 #define	FALSE				0
 #define	TRUE				1
 
@@ -202,9 +197,6 @@ makedev(unsigned int major, unsigned int minor)
 #define	P2SAMEHIGHBIT_TYPED(x, y, type) \
 	(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
 
-#define	SET_ERROR(err) \
-	(__set_error(__FILE__, __func__, __LINE__, err), err)
-
 #include <linux/sort.h>
 #define	qsort(base, num, size, cmp)		\
 	sort(base, num, size, cmp, NULL)

include/os/linux/zfs/sys/zfs_debug_os.h

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#ifndef _SYS_ZFS_DEBUG_OS_H
+#define	_SYS_ZFS_DEBUG_OS_H
+
+#define	 SET_ERROR(err) \
+	(__set_error(__FILE__, __func__, __LINE__, err), err)
+
+#endif	/* _SYS_ZFS_DEBUG_OS_H */