mem.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department, and code derived from software contributed to
11 * Berkeley by William Jolitz.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	from: Utah $Hdr: mem.c 1.13 89/10/08$
38 *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
39 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: stable/11/sys/powerpc/powerpc/mem.c 330897 2018-03-14 03:19:51Z eadler $");
43
44/*
45 * Memory special file
46 */
47
48#include <sys/param.h>
49#include <sys/conf.h>
50#include <sys/fcntl.h>
51#include <sys/kernel.h>
52#include <sys/lock.h>
53#include <sys/ioccom.h>
54#include <sys/malloc.h>
55#include <sys/memrange.h>
56#include <sys/module.h>
57#include <sys/mutex.h>
58#include <sys/proc.h>
59#include <sys/msgbuf.h>
60#include <sys/systm.h>
61#include <sys/signalvar.h>
62#include <sys/uio.h>
63
64#include <machine/md_var.h>
65#include <machine/vmparam.h>
66
67#include <vm/vm.h>
68#include <vm/pmap.h>
69#include <vm/vm_extern.h>
70#include <vm/vm_page.h>
71
72#include <machine/memdev.h>
73
74static void ppc_mrinit(struct mem_range_softc *);
75static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
76
77MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
78
79static struct mem_range_ops ppc_mem_range_ops = {
80	ppc_mrinit,
81	ppc_mrset,
82	NULL,
83	NULL
84};
85struct mem_range_softc mem_range_softc = {
86	&ppc_mem_range_ops,
87	0, 0, NULL
88};
89
90/* ARGSUSED */
91int
92memrw(struct cdev *dev, struct uio *uio, int flags)
93{
94	struct iovec *iov;
95	int error = 0;
96	vm_offset_t va, eva, off, v;
97	vm_prot_t prot;
98	struct vm_page m;
99	vm_page_t marr;
100	vm_size_t cnt;
101
102	cnt = 0;
103	error = 0;
104
105	while (uio->uio_resid > 0 && !error) {
106		iov = uio->uio_iov;
107		if (iov->iov_len == 0) {
108			uio->uio_iov++;
109			uio->uio_iovcnt--;
110			if (uio->uio_iovcnt < 0)
111				panic("memrw");
112			continue;
113		}
114		if (dev2unit(dev) == CDEV_MINOR_MEM) {
115kmem_direct_mapped:	v = uio->uio_offset;
116
117			off = uio->uio_offset & PAGE_MASK;
118			cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
119			    PAGE_MASK);
120			cnt = min(cnt, PAGE_SIZE - off);
121			cnt = min(cnt, iov->iov_len);
122
123			if (mem_valid(v, cnt)) {
124				error = EFAULT;
125				break;
126			}
127
128			if (!pmap_dev_direct_mapped(v, cnt)) {
129				error = uiomove((void *)v, cnt, uio);
130			} else {
131				m.phys_addr = trunc_page(v);
132				marr = &m;
133				error = uiomove_fromphys(&marr, off, cnt, uio);
134			}
135		}
136		else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
137			va = uio->uio_offset;
138
139			if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
140				goto kmem_direct_mapped;
141
142			va = trunc_page(uio->uio_offset);
143			eva = round_page(uio->uio_offset
144			    + iov->iov_len);
145
146			/*
147			 * Make sure that all the pages are currently resident
148			 * so that we don't create any zero-fill pages.
149			 */
150
151			for (; va < eva; va += PAGE_SIZE)
152				if (pmap_extract(kernel_pmap, va) == 0)
153					return (EFAULT);
154
155			prot = (uio->uio_rw == UIO_READ)
156			    ? VM_PROT_READ : VM_PROT_WRITE;
157
158			va = uio->uio_offset;
159			if (kernacc((void *) va, iov->iov_len, prot)
160			    == FALSE)
161				return (EFAULT);
162
163			error = uiomove((void *)va, iov->iov_len, uio);
164
165			continue;
166		}
167	}
168
169	return (error);
170}
171
172/*
173 * allow user processes to MMAP some memory sections
174 * instead of going through read/write
175 */
176int
177memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
178    int prot, vm_memattr_t *memattr)
179{
180	int i;
181
182	if (dev2unit(dev) == CDEV_MINOR_MEM)
183		*paddr = offset;
184	else
185		return (EFAULT);
186
187	for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
188		if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
189			continue;
190
191		if (offset >= mem_range_softc.mr_desc[i].mr_base &&
192		    offset < mem_range_softc.mr_desc[i].mr_base +
193		    mem_range_softc.mr_desc[i].mr_len) {
194			switch (mem_range_softc.mr_desc[i].mr_flags &
195			    MDF_ATTRMASK) {
196			case MDF_WRITEBACK:
197				*memattr = VM_MEMATTR_WRITE_BACK;
198				break;
199			case MDF_WRITECOMBINE:
200				*memattr = VM_MEMATTR_WRITE_COMBINING;
201				break;
202			case MDF_UNCACHEABLE:
203				*memattr = VM_MEMATTR_UNCACHEABLE;
204				break;
205			case MDF_WRITETHROUGH:
206				*memattr = VM_MEMATTR_WRITE_THROUGH;
207				break;
208			}
209
210			break;
211		}
212	}
213
214	return (0);
215}
216
217static void
218ppc_mrinit(struct mem_range_softc *sc)
219{
220	sc->mr_cap = 0;
221	sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
222	sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
223	    M_MEMDESC, M_WAITOK | M_ZERO);
224}
225
226static int
227ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
228{
229	int i;
230
231	switch(*arg) {
232	case MEMRANGE_SET_UPDATE:
233		for (i = 0; i < sc->mr_ndesc; i++) {
234			if (!sc->mr_desc[i].mr_len) {
235				sc->mr_desc[i] = *desc;
236				sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
237				return (0);
238			}
239			if (sc->mr_desc[i].mr_base == desc->mr_base &&
240			    sc->mr_desc[i].mr_len == desc->mr_len)
241				return (EEXIST);
242		}
243		return (ENOSPC);
244	case MEMRANGE_SET_REMOVE:
245		for (i = 0; i < sc->mr_ndesc; i++)
246			if (sc->mr_desc[i].mr_base == desc->mr_base &&
247			    sc->mr_desc[i].mr_len == desc->mr_len) {
248				bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
249				return (0);
250			}
251		return (ENOENT);
252	default:
253		return (EOPNOTSUPP);
254	}
255
256	return (0);
257}
258
259/*
260 * Operations for changing memory attributes.
261 *
262 * This is basically just an ioctl shim for mem_range_attr_get
263 * and mem_range_attr_set.
264 */
265/* ARGSUSED */
266int
267memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
268    struct thread *td)
269{
270	int nd, error = 0;
271	struct mem_range_op *mo = (struct mem_range_op *)data;
272	struct mem_range_desc *md;
273
274	/* is this for us? */
275	if ((cmd != MEMRANGE_GET) &&
276	    (cmd != MEMRANGE_SET))
277		return (ENOTTY);
278
279	/* any chance we can handle this? */
280	if (mem_range_softc.mr_op == NULL)
281		return (EOPNOTSUPP);
282
283	/* do we have any descriptors? */
284	if (mem_range_softc.mr_ndesc == 0)
285		return (ENXIO);
286
287	switch (cmd) {
288	case MEMRANGE_GET:
289		nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
290		if (nd > 0) {
291			md = (struct mem_range_desc *)
292				malloc(nd * sizeof(struct mem_range_desc),
293				       M_MEMDESC, M_WAITOK);
294			error = mem_range_attr_get(md, &nd);
295			if (!error)
296				error = copyout(md, mo->mo_desc,
297					nd * sizeof(struct mem_range_desc));
298			free(md, M_MEMDESC);
299		}
300		else
301			nd = mem_range_softc.mr_ndesc;
302		mo->mo_arg[0] = nd;
303		break;
304
305	case MEMRANGE_SET:
306		md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
307						    M_MEMDESC, M_WAITOK);
308		error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
309		/* clamp description string */
310		md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
311		if (error == 0)
312			error = mem_range_attr_set(md, &mo->mo_arg[0]);
313		free(md, M_MEMDESC);
314		break;
315	}
316	return (error);
317}
318
319