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authorBjoern A. Zeeb <bz@FreeBSD.org>2021-01-28 16:15:12 +0000
committerBjoern A. Zeeb <bz@FreeBSD.org>2021-01-28 16:15:12 +0000
commit4abbf816bf06aa70200c5d1d976dd61c2752bdaf (patch)
treeed23f338f3070d8d49d07da7cf10ed926d906c32
parenta6c2507d1baedb183268e31bc6b6f659a9529904 (diff)
downloadsrc-4abbf816bf06aa70200c5d1d976dd61c2752bdaf.tar.gz
src-4abbf816bf06aa70200c5d1d976dd61c2752bdaf.zip
LinuxKPI: upstream a collection of drm-kmod conflicting changes
The upcoming in-kernel implementations for LinuxKPI based on work on iwlwifi (and other wireless drivers) conflicts in a few places with the drm-kmod graphics work outside the base system. In order to transition smoothly extract the conflicting bits. This included "unaligned" accessor functions, sg_pcopy_from_buffer(), IS_*() macros (to be further restricted in the future), power management bits (possibly no longer conflicting with DRM), and other minor changes. Obtained-from: bz_iwlwifi Sponsored-by: The FreeBSD Foundation MFC after: 3 days Reviewed by: kib, hselasky, manu, bdragon (looked at earlier versions) Differential Revision: https://reviews.freebsd.org/D26598
-rw-r--r--sys/compat/linuxkpi/common/include/asm/unaligned.h78
-rw-r--r--sys/compat/linuxkpi/common/include/linux/kernel.h42
-rw-r--r--sys/compat/linuxkpi/common/include/linux/kobject.h14
-rw-r--r--sys/compat/linuxkpi/common/include/linux/lockdep.h1
-rw-r--r--sys/compat/linuxkpi/common/include/linux/pm.h52
-rw-r--r--sys/compat/linuxkpi/common/include/linux/scatterlist.h54
6 files changed, 241 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/asm/unaligned.h b/sys/compat/linuxkpi/common/include/asm/unaligned.h
new file mode 100644
index 000000000000..7597f00f7596
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/asm/unaligned.h
@@ -0,0 +1,78 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _ASM_UNALIGNED_H
+#define _ASM_UNALIGNED_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+static __inline uint32_t
+get_unaligned_le32(const void *p)
+{
+
+ return (le32_to_cpup((const __le32 *)p));
+}
+
+static __inline void
+put_unaligned_le32(__le32 v, void *p)
+{
+ __le32 x;
+
+ x = cpu_to_le32(v);
+ memcpy(p, &x, sizeof(x));
+}
+
+static __inline void
+put_unaligned_le64(__le64 v, void *p)
+{
+ __le64 x;
+
+ x = cpu_to_le64(v);
+ memcpy(p, &x, sizeof(x));
+}
+
+static __inline uint16_t
+get_unaligned_be16(const void *p)
+{
+
+ return (be16_to_cpup((const __be16 *)p));
+}
+
+static __inline uint32_t
+get_unaligned_be32(const void *p)
+{
+
+ return (be32_to_cpup((const __be32 *)p));
+}
+
+#endif /* _ASM_UNALIGNED_H */
diff --git a/sys/compat/linuxkpi/common/include/linux/kernel.h b/sys/compat/linuxkpi/common/include/linux/kernel.h
index 9b0a2df72322..daef6216a151 100644
--- a/sys/compat/linuxkpi/common/include/linux/kernel.h
+++ b/sys/compat/linuxkpi/common/include/linux/kernel.h
@@ -593,4 +593,46 @@ linux_ratelimited(linux_ratelimit_t *rl)
#define TAINT_WARN 0
#define test_taint(x) (0)
+/*
+ * Checking if an option is defined would be easy if we could do CPP inside CPP.
+ * The defined case whether -Dxxx or -Dxxx=1 are easy to deal with. In either
+ * case the defined value is "1". A more general -Dxxx=<c> case will require
+ * more effort to deal with all possible "true" values. Hope we do not have
+ * to do this as well.
+ * The real problem is the undefined case. To avoid this problem we do the
+ * concat/varargs trick: "yyy" ## xxx can make two arguments if xxx is "1"
+ * by having a #define for yyy_1 which is "ignore,".
+ * Otherwise we will just get "yyy".
+ * Need to be careful about variable substitutions in macros though.
+ * This way we make a (true, false) problem a (don't care, true, false) or a
+ * (don't care true, false). Then we can use a variadic macro to only select
+ * the always well known and defined argument #2. And that seems to be
+ * exactly what we need. Use 1 for true and 0 for false to also allow
+ * #if IS_*() checks pre-compiler checks which do not like #if true.
+ */
+#define ___XAB_1 dontcare,
+#define ___IS_XAB(_ignore, _x, ...) (_x)
+#define __IS_XAB(_x) ___IS_XAB(_x 1, 0)
+#define _IS_XAB(_x) __IS_XAB(__CONCAT(___XAB_, _x))
+
+/* This is if CONFIG_ccc=y. */
+#define IS_BUILTIN(_x) _IS_XAB(_x)
+/* This is if CONFIG_ccc=m. */
+#define IS_MODULE(_x) _IS_XAB(_x ## _MODULE)
+/* This is if CONFIG_ccc is compiled in(=y) or a module(=m). */
+#define IS_ENABLED(_x) (IS_BUILTIN(_x) || IS_MODULE(_x))
+/*
+ * This is weird case. If the CONFIG_ccc is builtin (=y) this returns true;
+ * or if the CONFIG_ccc is a module (=m) and the caller is built as a module
+ * (-DMODULE defined) this returns true, but if the callers is not a module
+ * (-DMODULE not defined, which means caller is BUILTIN) then it returns
+ * false. In other words, a module can reach the kernel, a module can reach
+ * a module, but the kernel cannot reach a module, and code never compiled
+ * cannot be reached either.
+ * XXX -- I'd hope the module-to-module case would be handled by a proper
+ * module dependency definition (MODULE_DEPEND() in FreeBSD).
+ */
+#define IS_REACHABLE(_x) (IS_BUILTIN(_x) || \
+ (IS_MODULE(_x) && IS_BUILTIN(MODULE)))
+
#endif /* _LINUX_KERNEL_H_ */
diff --git a/sys/compat/linuxkpi/common/include/linux/kobject.h b/sys/compat/linuxkpi/common/include/linux/kobject.h
index bd9e1c4ec6f5..403ec1495c32 100644
--- a/sys/compat/linuxkpi/common/include/linux/kobject.h
+++ b/sys/compat/linuxkpi/common/include/linux/kobject.h
@@ -41,6 +41,8 @@
struct kobject;
struct sysctl_oid;
+#define KOBJ_CHANGE 0x01
+
struct kobj_type {
void (*release)(struct kobject *kobj);
const struct sysfs_ops *sysfs_ops;
@@ -151,4 +153,16 @@ int kobject_set_name(struct kobject *kobj, const char *fmt, ...);
int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype,
struct kobject *parent, const char *fmt, ...);
+static __inline void
+kobject_uevent_env(struct kobject *kobj, int action, char *envp[])
+{
+
+ /*
+ * iwlwifi(4) sends an INACCESSIBLE event when it detects that the card
+ * (pice endpoint) is gone and it attempts a removal cleanup.
+ * Not sure if we do anything related to udev/sysfs at the moment or
+ * need a shortcut or simply ignore it (for now).
+ */
+}
+
#endif /* _LINUX_KOBJECT_H_ */
diff --git a/sys/compat/linuxkpi/common/include/linux/lockdep.h b/sys/compat/linuxkpi/common/include/linux/lockdep.h
index d2b3d4485dde..a86157ba5924 100644
--- a/sys/compat/linuxkpi/common/include/linux/lockdep.h
+++ b/sys/compat/linuxkpi/common/include/linux/lockdep.h
@@ -42,6 +42,7 @@ struct lock_class_key {
#define lockdep_set_class_and_name(lock, key, name)
#define lockdep_set_current_reclaim_state(g) do { } while (0)
#define lockdep_clear_current_reclaim_state() do { } while (0)
+#define lockdep_init_map(_map, _name, _key, _x) do { } while(0)
#ifdef INVARIANTS
#define lockdep_assert_held(m) do { \
diff --git a/sys/compat/linuxkpi/common/include/linux/pm.h b/sys/compat/linuxkpi/common/include/linux/pm.h
new file mode 100644
index 000000000000..6b8a7e768a8c
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/pm.h
@@ -0,0 +1,52 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _LINUXKPI_LINUX_PM_H
+#define _LINUXKPI_LINUX_PM_H
+
+#ifdef CONFIG_PM_SLEEP
+#define SIMPLE_DEV_PM_OPS(_name, _suspendfunc, _resumefunc) \
+const struct dev_pm_ops _name = { \
+ .suspend = _suspendfunc, \
+ .resume = _resumefunc, \
+ .freeze = _suspendfunc, \
+ .thaw = _resumefunc, \
+ .poweroff = _suspendfunc, \
+ .restore = _resumefunc, \
+}
+#else
+#define SIMPLE_DEV_PM_OPS(_name, _suspendfunc, _resumefunc) \
+const struct dev_pm_ops _name = { \
+}
+#endif
+
+#endif /* _LINUXKPI_LINUX_PM_H */
diff --git a/sys/compat/linuxkpi/common/include/linux/scatterlist.h b/sys/compat/linuxkpi/common/include/linux/scatterlist.h
index 9104cb8dd78a..ebf0632f6f58 100644
--- a/sys/compat/linuxkpi/common/include/linux/scatterlist.h
+++ b/sys/compat/linuxkpi/common/include/linux/scatterlist.h
@@ -32,6 +32,9 @@
#ifndef _LINUX_SCATTERLIST_H_
#define _LINUX_SCATTERLIST_H_
+#include <sys/types.h>
+#include <sys/sf_buf.h>
+
#include <linux/page.h>
#include <linux/slab.h>
#include <linux/mm.h>
@@ -479,4 +482,55 @@ sg_page_iter_page(struct sg_page_iter *piter)
return (nth_page(sg_page(piter->sg), piter->sg_pgoffset));
}
+static __inline size_t
+sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+ const void *buf, size_t buflen, off_t skip)
+{
+ struct sg_page_iter piter;
+ struct page *page;
+ struct sf_buf *sf;
+ size_t len, copied;
+ char *p, *b;
+
+ if (buflen == 0)
+ return (0);
+
+ b = __DECONST(char *, buf);
+ copied = 0;
+ sched_pin();
+ for_each_sg_page(sgl, &piter, nents, 0) {
+
+ /* Skip to the start. */
+ if (piter.sg->length <= skip) {
+ skip -= piter.sg->length;
+ continue;
+ }
+
+ /* See how much to copy. */
+ KASSERT(((piter.sg->length - skip) != 0 && (buflen != 0)),
+ ("%s: sg len %u - skip %ju || buflen %zu is 0\n",
+ __func__, piter.sg->length, (uintmax_t)skip, buflen));
+ len = min(piter.sg->length - skip, buflen);
+
+ page = sg_page_iter_page(&piter);
+ sf = sf_buf_alloc(page, SFB_CPUPRIVATE | SFB_NOWAIT);
+ if (sf == NULL)
+ break;
+ p = (char *)sf_buf_kva(sf) + piter.sg_pgoffset + skip;
+ memcpy(p, b, len);
+ sf_buf_free(sf);
+
+ copied += len;
+ /* Either we exactly filled the page, or we are done. */
+ buflen -= len;
+ if (buflen == 0)
+ break;
+ skip -= len;
+ b += len;
+ }
+ sched_unpin();
+
+ return (copied);
+}
+
#endif /* _LINUX_SCATTERLIST_H_ */