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Merge branch 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

Browse Source 
Pull UML updates from Richard Weinberger:

 - DISCARD support for our block device driver

 - Many TLB flush optimizations

 - Various smaller fixes

 - And most important, Anton agreed to help me maintaining UML

* 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: Remove obsolete reenable_XX calls
  um: writev needs <sys/uio.h>
  Add Anton Ivanov to UML maintainers
  um: remove redundant generic-y
  um: Optimize Flush TLB for force/fork case
  um: Avoid marking pages with "changed protection"
  um: Skip TLB flushing where not needed
  um: Optimize TLB operations v2
  um: Remove unnecessary faulted check in uaccess.c
  um: Add support for DISCARD in the UBD Driver
  um: Remove unsafe printks from the io thread
  um: Clean-up command processing in UML UBD driver
  um: Switch to block-mq constants in the UML UBD driver
  um: Make GCOV depend on !KCOV
  um: Include sys/uio.h to have writev()
  um: Add HAVE_DEBUG_BUGVERBOSE
  um: Update maintainers file entry
This commit is contained in:
Linus Torvalds 2019-01-02 18:39:22 -08:00
commit 6aa293d8ff
20 changed files with 259 additions and 173 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
MAINTAINERS
View File

@ -15951,15 +15951,16 @@ F: drivers/media/usb/zr364xx/
USER-MODE LINUX (UML)
M: Jeff Dike <jdike@addtoit.com>
M: Richard Weinberger <richard@nod.at>
M: Anton Ivanov <anton.ivanov@cambridgegreys.com>
L: linux-um@lists.infradead.org
W: http://user-mode-linux.sourceforge.net
Q: https://patchwork.ozlabs.org/project/linux-um/list/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml.git
S: Maintained
F: Documentation/virtual/uml/
F: arch/um/
F: arch/x86/um/
F: fs/hostfs/
F: fs/hppfs/
USERSPACE COPYIN/COPYOUT (UIOVEC)
M: Alexander Viro <viro@zeniv.linux.org.uk>

1
arch/um/Kconfig
View File

@ -12,6 +12,7 @@ config UML
select HAVE_UID16
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_DEBUG_KMEMLEAK
select HAVE_DEBUG_BUGVERBOSE
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select GENERIC_CLOCKEVENTS

1
arch/um/Kconfig.debug
View File

@ -16,6 +16,7 @@ config GPROF
config GCOV
bool "Enable gcov support"
depends on DEBUG_INFO
depends on !KCOV
help
This option allows developers to retrieve coverage data from a UML
session.

10
arch/um/drivers/chan_kern.c
View File

@ -211,12 +211,6 @@ void deactivate_chan(struct chan *chan, int irq)
deactivate_fd(chan->fd, irq);
}
void reactivate_chan(struct chan *chan, int irq)
{
if (chan && chan->enabled)
reactivate_fd(chan->fd, irq);
}
int write_chan(struct chan *chan, const char *buf, int len,
int write_irq)
{
@ -228,8 +222,6 @@ int write_chan(struct chan *chan, const char *buf, int len,
n = chan->ops->write(chan->fd, buf, len, chan->data);
if (chan->primary) {
ret = n;
if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
reactivate_fd(chan->fd, write_irq);
}
return ret;
}
@ -527,8 +519,6 @@ void chan_interrupt(struct line *line, int irq)
tty_insert_flip_char(port, c, TTY_NORMAL);
} while (err > 0);
if (err == 0)
reactivate_fd(chan->fd, irq);
if (err == -EIO) {
if (chan->primary) {
tty_port_tty_hangup(&line->port, false);

10
arch/um/drivers/line.c
View File

@ -235,14 +235,6 @@ void line_unthrottle(struct tty_struct *tty)
line->throttled = 0;
chan_interrupt(line, line->driver->read_irq);
/*
* Maybe there is enough stuff pending that calling the interrupt
* throttles us again. In this case, line->throttled will be 1
* again and we shouldn't turn the interrupt back on.
*/
if (!line->throttled)
reactivate_chan(line->chan_in, line->driver->read_irq);
}
static irqreturn_t line_write_interrupt(int irq, void *data)
@ -667,8 +659,6 @@ static irqreturn_t winch_interrupt(int irq, void *data)
tty_kref_put(tty);
}
out:
if (winch->fd != -1)
reactivate_fd(winch->fd, WINCH_IRQ);
return IRQ_HANDLED;
}

2
arch/um/drivers/mconsole_kern.c
View File

@ -96,7 +96,6 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
}
if (!list_empty(&mc_requests))
schedule_work(&mconsole_work);
reactivate_fd(fd, MCONSOLE_IRQ);
return IRQ_HANDLED;
}
@ -240,7 +239,6 @@ void mconsole_stop(struct mc_request *req)
(*req->cmd->handler)(req);
}
os_set_fd_block(req->originating_fd, 0);
reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
mconsole_reply(req, "", 0, 0);
}

2
arch/um/drivers/net_kern.c
View File

@ -137,8 +137,6 @@ static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
schedule_work(&lp->work);
goto out;
}
reactivate_fd(lp->fd, UM_ETH_IRQ);
out:
spin_unlock(&lp->lock);
return IRQ_HANDLED;

1
arch/um/drivers/port_kern.c
View File

@ -137,7 +137,6 @@ static void port_work_proc(struct work_struct *unused)
if (!port->has_connection)
continue;
reactivate_fd(port->fd, ACCEPT_IRQ);
while (port_accept(port))
;
port->has_connection = 0;

1
arch/um/drivers/random.c
View File

@ -73,7 +73,6 @@ static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
return ret ? : -EAGAIN;
atomic_inc(&host_sleep_count);
reactivate_fd(random_fd, RANDOM_IRQ);
add_sigio_fd(random_fd);
add_wait_queue(&host_read_wait, &wait);

231
arch/um/drivers/ubd_kern.c
View File

@ -1,4 +1,5 @@
/*
* Copyright (C) 2018 Cambridge Greys Ltd
* Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com)
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
@ -43,11 +44,11 @@
#include <os.h>
#include "cow.h"
enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH };
/* Max request size is determined by sector mask - 32K */
#define UBD_MAX_REQUEST (8 * sizeof(long))
struct io_thread_req {
struct request *req;
enum ubd_req op;
int fds[2];
unsigned long offsets[2];
unsigned long long offset;
@ -153,6 +154,7 @@ struct ubd {
struct openflags openflags;
unsigned shared:1;
unsigned no_cow:1;
unsigned no_trim:1;
struct cow cow;
struct platform_device pdev;
struct request_queue *queue;
@ -176,6 +178,7 @@ struct ubd {
.boot_openflags = OPEN_FLAGS, \
.openflags = OPEN_FLAGS, \
.no_cow = 0, \
.no_trim = 0, \
.shared = 0, \
.cow = DEFAULT_COW, \
.lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
@ -322,7 +325,7 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
*index_out = n;
err = -EINVAL;
for (i = 0; i < sizeof("rscd="); i++) {
for (i = 0; i < sizeof("rscdt="); i++) {
switch (*str) {
case 'r':
flags.w = 0;
@ -336,12 +339,15 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
case 'c':
ubd_dev->shared = 1;
break;
case 't':
ubd_dev->no_trim = 1;
break;
case '=':
str++;
goto break_loop;
default:
*error_out = "Expected '=' or flag letter "
"(r, s, c, or d)";
"(r, s, c, t or d)";
goto out;
}
str++;
@ -414,6 +420,7 @@ __uml_help(ubd_setup,
" 'c' will cause the device to be treated as being shared between multiple\n"
" UMLs and file locking will be turned off - this is appropriate for a\n"
" cluster filesystem and inappropriate at almost all other times.\n\n"
" 't' will disable trim/discard support on the device (enabled by default).\n\n"
);
static int udb_setup(char *str)
@ -511,16 +518,21 @@ static void ubd_handler(void)
}
for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
struct io_thread_req *io_req = (*irq_req_buffer)[count];
int err = io_req->error ? BLK_STS_IOERR : BLK_STS_OK;
if (!blk_update_request(io_req->req, err, io_req->length))
__blk_mq_end_request(io_req->req, err);
if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
blk_queue_max_discard_sectors(io_req->req->q, 0);
blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
}
if ((io_req->error) || (io_req->buffer == NULL))
blk_mq_end_request(io_req->req, io_req->error);
else {
if (!blk_update_request(io_req->req, io_req->error, io_req->length))
__blk_mq_end_request(io_req->req, io_req->error);
}
kfree(io_req);
}
}
reactivate_fd(thread_fd, UBD_IRQ);
}
static irqreturn_t ubd_intr(int irq, void *dev)
@ -789,7 +801,7 @@ static int ubd_open_dev(struct ubd *ubd_dev)
if((fd == -ENOENT) && create_cow){
fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
ubd_dev->openflags, 1 << 9, PAGE_SIZE,
ubd_dev->openflags, SECTOR_SIZE, PAGE_SIZE,
&ubd_dev->cow.bitmap_offset,
&ubd_dev->cow.bitmap_len,
&ubd_dev->cow.data_offset);
@ -830,6 +842,14 @@ static int ubd_open_dev(struct ubd *ubd_dev)
if(err < 0) goto error;
ubd_dev->cow.fd = err;
}
if (ubd_dev->no_trim == 0) {
ubd_dev->queue->limits.discard_granularity = SECTOR_SIZE;
ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
}
blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
return 0;
error:
os_close_file(ubd_dev->fd);
@ -882,7 +902,7 @@ static int ubd_disk_register(int major, u64 size, int unit,
return 0;
}
#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
#define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
static const struct blk_mq_ops ubd_mq_ops = {
.queue_rq = ubd_queue_rq,
@ -1234,10 +1254,10 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
__u64 bitmap_offset, unsigned long *bitmap_words,
__u64 bitmap_len)
{
__u64 sector = io_offset >> 9;
__u64 sector = io_offset >> SECTOR_SHIFT;
int i, update_bitmap = 0;
for(i = 0; i < length >> 9; i++){
for (i = 0; i < length >> SECTOR_SHIFT; i++) {
if(cow_mask != NULL)
ubd_set_bit(i, (unsigned char *) cow_mask);
if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
@ -1271,14 +1291,14 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
__u64 bitmap_offset, __u64 bitmap_len)
{
__u64 sector = req->offset >> 9;
__u64 sector = req->offset >> SECTOR_SHIFT;
int i;
if(req->length > (sizeof(req->sector_mask) * 8) << 9)
if (req->length > (sizeof(req->sector_mask) * 8) << SECTOR_SHIFT)
panic("Operation too long");
if(req->op == UBD_READ) {
for(i = 0; i < req->length >> 9; i++){
if (req_op(req->req) == REQ_OP_READ) {
for (i = 0; i < req->length >> SECTOR_SHIFT; i++) {
if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
ubd_set_bit(i, (unsigned char *)
&req->sector_mask);
@ -1307,68 +1327,86 @@ static int ubd_queue_one_vec(struct blk_mq_hw_ctx *hctx, struct request *req,
io_req->fds[0] = dev->fd;
io_req->error = 0;
if (req_op(req) == REQ_OP_FLUSH) {
io_req->op = UBD_FLUSH;
} else {
io_req->fds[1] = dev->fd;
io_req->cow_offset = -1;
io_req->offset = off;
io_req->length = bvec->bv_len;
io_req->sector_mask = 0;
io_req->op = rq_data_dir(req) == READ ? UBD_READ : UBD_WRITE;
io_req->offsets[0] = 0;
io_req->offsets[1] = dev->cow.data_offset;
if (bvec != NULL) {
io_req->buffer = page_address(bvec->bv_page) + bvec->bv_offset;
io_req->sectorsize = 1 << 9;
if (dev->cow.file) {
cowify_req(io_req, dev->cow.bitmap,
dev->cow.bitmap_offset, dev->cow.bitmap_len);
}
io_req->length = bvec->bv_len;
} else {
io_req->buffer = NULL;
io_req->length = blk_rq_bytes(req);
}
io_req->sectorsize = SECTOR_SIZE;
io_req->fds[1] = dev->fd;
io_req->cow_offset = -1;
io_req->offset = off;
io_req->sector_mask = 0;
io_req->offsets[0] = 0;
io_req->offsets[1] = dev->cow.data_offset;
if (dev->cow.file)
cowify_req(io_req, dev->cow.bitmap,
dev->cow.bitmap_offset, dev->cow.bitmap_len);
ret = os_write_file(thread_fd, &io_req, sizeof(io_req));
if (ret != sizeof(io_req)) {
if (ret != -EAGAIN)
pr_err("write to io thread failed: %d\n", -ret);
kfree(io_req);
}
return ret;
}
static int queue_rw_req(struct blk_mq_hw_ctx *hctx, struct request *req)
{
struct req_iterator iter;
struct bio_vec bvec;
int ret;
u64 off = (u64)blk_rq_pos(req) << SECTOR_SHIFT;
rq_for_each_segment(bvec, req, iter) {
ret = ubd_queue_one_vec(hctx, req, off, &bvec);
if (ret < 0)
return ret;
off += bvec.bv_len;
}
return 0;
}
static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct ubd *ubd_dev = hctx->queue->queuedata;
struct request *req = bd->rq;
int ret = 0;
int ret = 0, res = BLK_STS_OK;
blk_mq_start_request(req);
spin_lock_irq(&ubd_dev->lock);
if (req_op(req) == REQ_OP_FLUSH) {
switch (req_op(req)) {
/* operations with no lentgth/offset arguments */
case REQ_OP_FLUSH:
ret = ubd_queue_one_vec(hctx, req, 0, NULL);
} else {
struct req_iterator iter;
struct bio_vec bvec;
u64 off = (u64)blk_rq_pos(req) << 9;
rq_for_each_segment(bvec, req, iter) {
ret = ubd_queue_one_vec(hctx, req, off, &bvec);
if (ret < 0)
goto out;
off += bvec.bv_len;
}
break;
case REQ_OP_READ:
case REQ_OP_WRITE:
ret = queue_rw_req(hctx, req);
break;
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
ret = ubd_queue_one_vec(hctx, req, (u64)blk_rq_pos(req) << 9, NULL);
break;
default:
WARN_ON_ONCE(1);
res = BLK_STS_NOTSUPP;
}
out:
spin_unlock_irq(&ubd_dev->lock);
if (ret < 0)
blk_mq_requeue_request(req, true);
return BLK_STS_OK;
return res;
}
static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
@ -1413,39 +1451,60 @@ static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
return -EINVAL;
}
static int map_error(int error_code)
{
switch (error_code) {
case 0:
return BLK_STS_OK;
case ENOSYS:
case EOPNOTSUPP:
return BLK_STS_NOTSUPP;
case ENOSPC:
return BLK_STS_NOSPC;
}
return BLK_STS_IOERR;
}
/*
* Everything from here onwards *IS NOT PART OF THE KERNEL*
*
* The following functions are part of UML hypervisor code.
* All functions from here onwards are executed as a helper
* thread and are not allowed to execute any kernel functions.
*
* Any communication must occur strictly via shared memory and IPC.
*
* Do not add printks, locks, kernel memory operations, etc - it
* will result in unpredictable behaviour and/or crashes.
*/
static int update_bitmap(struct io_thread_req *req)
{
int n;
if(req->cow_offset == -1)
return 0;
return map_error(0);
n = os_pwrite_file(req->fds[1], &req->bitmap_words,
sizeof(req->bitmap_words), req->cow_offset);
if(n != sizeof(req->bitmap_words)){
printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
req->fds[1]);
return 1;
}
if (n != sizeof(req->bitmap_words))
return map_error(-n);
return 0;
return map_error(0);
}
static void do_io(struct io_thread_req *req)
{
char *buf;
char *buf = NULL;
unsigned long len;
int n, nsectors, start, end, bit;
__u64 off;
if (req->op == UBD_FLUSH) {
/* FLUSH is really a special case, we cannot "case" it with others */
if (req_op(req->req) == REQ_OP_FLUSH) {
/* fds[0] is always either the rw image or our cow file */
n = os_sync_file(req->fds[0]);
if (n != 0) {
printk("do_io - sync failed err = %d "
"fd = %d\n", -n, req->fds[0]);
req->error = 1;
}
req->error = map_error(-os_sync_file(req->fds[0]));
return;
}
@ -1462,30 +1521,42 @@ static void do_io(struct io_thread_req *req)
off = req->offset + req->offsets[bit] +
start * req->sectorsize;
len = (end - start) * req->sectorsize;
buf = &req->buffer[start * req->sectorsize];
if (req->buffer != NULL)
buf = &req->buffer[start * req->sectorsize];
if(req->op == UBD_READ){
switch (req_op(req->req)) {
case REQ_OP_READ:
n = 0;
do {
buf = &buf[n];
len -= n;
n = os_pread_file(req->fds[bit], buf, len, off);
if (n < 0) {
printk("do_io - read failed, err = %d "
"fd = %d\n", -n, req->fds[bit]);
req->error = 1;
req->error = map_error(-n);
return;
}
} while((n < len) && (n != 0));
if (n < len) memset(&buf[n], 0, len - n);
} else {
break;
case REQ_OP_WRITE:
n = os_pwrite_file(req->fds[bit], buf, len, off);
if(n != len){
printk("do_io - write failed err = %d "
"fd = %d\n", -n, req->fds[bit]);
req->error = 1;
req->error = map_error(-n);
return;
}
break;
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
n = os_falloc_punch(req->fds[bit], off, len);
if (n) {
req->error = map_error(-n);
return;
}
break;
default:
WARN_ON_ONCE(1);
req->error = BLK_STS_NOTSUPP;
return;
}
start = end;
@ -1520,11 +1591,6 @@ int io_thread(void *arg)
if (n == -EAGAIN) {
ubd_read_poll(-1);
continue;
} else {
printk("io_thread - read failed, fd = %d, "
"err = %d,"
"reminder = %d\n",
kernel_fd, -n, io_remainder_size);
}
}
@ -1539,11 +1605,6 @@ int io_thread(void *arg)
res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n);
if (res >= 0) {
written += res;
} else {
if (res != -EAGAIN) {
printk("io_thread - write failed, fd = %d, "
"err = %d\n", kernel_fd, -n);
}
}
if (written < n) {
ubd_write_poll(-1);

2
arch/um/drivers/vector_user.c
View File

@ -25,11 +25,13 @@
#include <linux/if_packet.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <linux/virtio_net.h>
#include <netdb.h>
#include <stdlib.h>
#include <os.h>
#include <um_malloc.h>
#include <sys/uio.h>
#include "vector_user.h"
#define ID_GRE 0

2
arch/um/include/asm/Kbuild
View File

@ -10,9 +10,7 @@ generic-y += exec.h
generic-y += extable.h
generic-y += ftrace.h
generic-y += futex.h
generic-y += hardirq.h
generic-y += hw_irq.h
generic-y += io.h
generic-y += irq_regs.h
generic-y += irq_work.h
generic-y += kdebug.h

9
arch/um/include/asm/pgtable.h
View File

@ -197,12 +197,17 @@ static inline pte_t pte_mkold(pte_t pte)
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_clear_bits(pte, _PAGE_RW);
if (likely(pte_get_bits(pte, _PAGE_RW)))
pte_clear_bits(pte, _PAGE_RW);
else
return pte;
return(pte_mknewprot(pte));
}
static inline pte_t pte_mkread(pte_t pte)
{
if (unlikely(pte_get_bits(pte, _PAGE_USER)))
return pte;
pte_set_bits(pte, _PAGE_USER);
return(pte_mknewprot(pte));
}
@ -221,6 +226,8 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkwrite(pte_t pte)
{
if (unlikely(pte_get_bits(pte, _PAGE_RW)))
return pte;
pte_set_bits(pte, _PAGE_RW);
return(pte_mknewprot(pte));
}

1
arch/um/include/shared/irq_user.h
View File

@ -31,7 +31,6 @@ struct irq_fd {
struct siginfo;
extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
extern void free_irq_by_fd(int fd);
extern void reactivate_fd(int fd, int irqnum);
extern void deactivate_fd(int fd, int irqnum);
extern int deactivate_all_fds(void);
extern int activate_ipi(int fd, int pid);

1
arch/um/include/shared/os.h
View File

@ -175,6 +175,7 @@ extern int os_fchange_dir(int fd);
extern unsigned os_major(unsigned long long dev);
extern unsigned os_minor(unsigned long long dev);
extern unsigned long long os_makedev(unsigned major, unsigned minor);
extern int os_falloc_punch(int fd, unsigned long long offset, int count);
/* start_up.c */
extern void os_early_checks(void);

6
arch/um/kernel/irq.c
View File

@ -350,11 +350,6 @@ static void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
}
void reactivate_fd(int fd, int irqnum)
{
/** NOP - we do auto-EOI now **/
}
void deactivate_fd(int fd, int irqnum)
{
struct irq_entry *to_free;
@ -449,7 +444,6 @@ int um_request_irq(unsigned int irq, int fd, int type,
}
EXPORT_SYMBOL(um_request_irq);
EXPORT_SYMBOL(reactivate_fd);
/*
* irq_chip must define at least enable/disable and ack when

1
arch/um/kernel/sigio.c
View File

@ -16,7 +16,6 @@ static irqreturn_t sigio_interrupt(int irq, void *data)
char c;
os_read_file(sigio_irq_fd, &c, sizeof(c));
reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
return IRQ_HANDLED;
}

23
arch/um/kernel/skas/uaccess.c
View File

@ -62,27 +62,28 @@ static int do_op_one_page(unsigned long addr, int len, int is_write,
jmp_buf buf;
struct page *page;
pte_t *pte;
int n, faulted;
int n;
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = pte_page(*pte);
#ifdef CONFIG_64BIT
pagefault_disable();
addr = (unsigned long) page_address(page) +
(addr & ~PAGE_MASK);
#else
addr = (unsigned long) kmap_atomic(page) +
(addr & ~PAGE_MASK);
#endif
n = (*op)(addr, len, arg);
current->thread.fault_catcher = &buf;
faulted = UML_SETJMP(&buf);
if (faulted == 0)
n = (*op)(addr, len, arg);
else
n = -1;
current->thread.fault_catcher = NULL;
#ifdef CONFIG_64BIT
pagefault_enable();
#else
kunmap_atomic((void *)addr);
#endif
return n;
}

115
arch/um/kernel/tlb.c
View File

@ -37,17 +37,19 @@ struct host_vm_change {
} mprotect;
} u;
} ops[1];
int userspace;
int index;
struct mm_id *id;
struct mm_struct *mm;
void *data;
int force;
};
#define INIT_HVC(mm, force) \
#define INIT_HVC(mm, force, userspace) \
((struct host_vm_change) \
{ .ops = { { .type = NONE } }, \
.id = &mm->context.id, \
.mm = mm, \
.data = NULL, \
.userspace = userspace, \
.index = 0, \
.force = force })
@ -68,18 +70,40 @@ static int do_ops(struct host_vm_change *hvc, int end,
op = &hvc->ops[i];
switch (op->type) {
case MMAP:
ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
op->u.mmap.prot, op->u.mmap.fd,
op->u.mmap.offset, finished, &hvc->data);
if (hvc->userspace)
ret = map(&hvc->mm->context.id, op->u.mmap.addr,
op->u.mmap.len, op->u.mmap.prot,
op->u.mmap.fd,
op->u.mmap.offset, finished,
&hvc->data);
else
map_memory(op->u.mmap.addr, op->u.mmap.offset,
op->u.mmap.len, 1, 1, 1);
break;
case MUNMAP:
ret = unmap(hvc->id, op->u.munmap.addr,
op->u.munmap.len, finished, &hvc->data);
if (hvc->userspace)
ret = unmap(&hvc->mm->context.id,
op->u.munmap.addr,
op->u.munmap.len, finished,
&hvc->data);
else
ret = os_unmap_memory(
(void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
ret = protect(hvc->id, op->u.mprotect.addr,
op->u.mprotect.len, op->u.mprotect.prot,
finished, &hvc->data);
if (hvc->userspace)
ret = protect(&hvc->mm->context.id,
op->u.mprotect.addr,
op->u.mprotect.len,
op->u.mprotect.prot,
finished, &hvc->data);
else
ret = os_protect_memory(
(void *) op->u.mprotect.addr,
op->u.mprotect.len,
1, 1, 1);
break;
default:
printk(KERN_ERR "Unknown op type %d in do_ops\n",
@ -100,9 +124,12 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
{
__u64 offset;
struct host_vm_op *last;
int fd, ret = 0;
int fd = -1, ret = 0;
fd = phys_mapping(phys, &offset);
if (hvc->userspace)
fd = phys_mapping(phys, &offset);
else
offset = phys;
if (hvc->index != 0) {
last = &hvc->ops[hvc->index - 1];
if ((last->type == MMAP) &&
@ -215,10 +242,11 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0));
if (hvc->force || pte_newpage(*pte)) {
if (pte_present(*pte))
ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, prot, hvc);
else
if (pte_present(*pte)) {
if (pte_newpage(*pte))
ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, prot, hvc);
} else
ret = add_munmap(addr, PAGE_SIZE, hvc);
} else if (pte_newprot(*pte))
ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
@ -277,9 +305,9 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
pgd_t *pgd;
struct host_vm_change hvc;
unsigned long addr = start_addr, next;
int ret = 0;
int ret = 0, userspace = 1;
hvc = INIT_HVC(mm, force);
hvc = INIT_HVC(mm, force, userspace);
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end_addr);
@ -314,9 +342,11 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
int updated = 0, err;
int updated = 0, err = 0, force = 0, userspace = 0;
struct host_vm_change hvc;
mm = &init_mm;
hvc = INIT_HVC(mm, force, userspace);
for (addr = start; addr < end;) {
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd)) {
@ -325,8 +355,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pgd_newpage(*pgd)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -342,8 +371,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pud_newpage(*pud)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -359,8 +387,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pmd_newpage(*pmd)) {
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@ -372,22 +399,25 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pte = pte_offset_kernel(pmd, addr);
if (!pte_present(*pte) || pte_newpage(*pte)) {
updated = 1;
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
err = add_munmap(addr, PAGE_SIZE, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
if (pte_present(*pte))
map_memory(addr,
pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
err = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 0, &hvc);
}
else if (pte_newprot(*pte)) {
updated = 1;
os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
err = add_mprotect(addr, PAGE_SIZE, 0, &hvc);
}
addr += PAGE_SIZE;
}
if (!err)
err = do_ops(&hvc, hvc.index, 1);
if (err < 0)
panic("flush_tlb_kernel failed, errno = %d\n", err);
return updated;
}
@ -491,6 +521,13 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
void flush_tlb_all(void)
{
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&current->mm->mm_users) == 0)
return;
flush_tlb_mm(current->mm);
}
@ -512,6 +549,13 @@ void __flush_tlb_one(unsigned long addr)
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&mm->mm_users) == 0)
return;
fix_range_common(mm, start_addr, end_addr, force);
}
@ -527,13 +571,6 @@ EXPORT_SYMBOL(flush_tlb_range);
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
/*
* Don't bother flushing if this address space is about to be
* destroyed.
*/
if (atomic_read(&mm->mm_users) == 0)
return;
fix_range(mm, start, end, 0);
}

10
arch/um/os-Linux/file.c
View File

@ -610,3 +610,13 @@ unsigned long long os_makedev(unsigned major, unsigned minor)
{
return makedev(major, minor);
}
int os_falloc_punch(int fd, unsigned long long offset, int len)
{
int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
if (n < 0)
return -errno;
return n;
}