| 65eca3a20264a8999570c269406196bd1ae23be7 |
|
20-Oct-2014 |
Cornelia Huck <cornelia.huck@de.ibm.com> |
virtio_console: move early VQ enablement
Commit f5866db6 (virtio_console: enable VQs early) tried to make
sure that DRIVER_OK was set when virtio_console started using its
virtqueues. Doing this in add_port(), however, means that we try
to set DRIVER_OK again when when a port is dynamically added after
the probe function is done.
Let's move virtio_device_ready() to the probe function just before
trying to use the virtqueues instead. This is fine as nothing can
fail inbetween.
Reported-by: Thomas Graf <tgraf@suug.ch>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
| 401bbdc901b268113d7c562616feb7fc37492aca |
|
15-Oct-2014 |
Michael S. Tsirkin <mst@redhat.com> |
virtio_console: enable VQs early on restore
virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after resume returns, virtio console violated this
rule by adding inbufs, which causes the VQ to be used directly within
restore.
To fix, call virtio_device_ready before using VQs.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f5866db64f341776c2d9ed48080f82459fea6a55 |
|
15-Oct-2014 |
Michael S. Tsirkin <mst@redhat.com> |
virtio_console: enable VQs early
virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after probe returns, virtio console violated this
rule by adding inbufs, which causes the VQ to be used directly within
probe.
To fix, call virtio_device_ready before using VQs.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 5885e48e4412e75be5495fe889cec6762b165197 |
|
27-Jul-2014 |
Fabian Frederick <fabf@skynet.be> |
virtio: console: remove unnecessary null test before debugfs_remove_recursive
Fix checkpatch warning:
WARNING: debugfs_remove_recursive(NULL) is safe this check is probably not required
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: virtualization@lists.linux-foundation.org
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| fbb32750a62df75d1ffea547f3908b21c5496d9f |
|
03-Feb-2014 |
Al Viro <viro@zeniv.linux.org.uk> |
pipe: kill ->map() and ->unmap()
all pipe_buffer_operations have the same instances of those...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| c9efe51165fa0aff57be54e3cb0201ac87f68980 |
|
02-Feb-2014 |
Al Viro <viro@zeniv.linux.org.uk> |
fix a kmap leak in virtio_console
While we are at it, don't do kmap() under kmap_atomic(), *especially*
for a page we'd allocated with GFP_KERNEL. It's spelled "page_address",
and had that been more than that, we'd have a real trouble - kmap_high()
can block, and doing that while holding kmap_atomic() is a Bad Idea(tm).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
| 40e4dc530118dbb79e270d5554ac8415588378d2 |
|
29-Oct-2013 |
Heinz Graalfs <graalfs@linux.vnet.ibm.com> |
virtio_console: verify if queue is broken after virtqueue_get_buf()
If virtqueue_get_buf() returns with a NULL pointer it should be verified
if the virtqueue is broken, in order to avoid loop calling cpu_relax().
Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 855e0c5288177bcb193f6f6316952d2490478e1c |
|
14-Oct-2013 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: use size-based config accessors.
This lets the transport do endian conversion if necessary, and insulates
the drivers from the difference.
Most drivers can use the simple helpers virtio_cread() and virtio_cwrite().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 891070003999e7ac8881bba6f8242615382742eb |
|
17-Sep-2013 |
Aaron Lu <aaron.lu@intel.com> |
virtio: pm: use CONFIG_PM_SLEEP instead of CONFIG_PM
The freeze and restore functions defined in virtio drivers are used
for suspend and hibernate, so CONFIG_PM_SLEEP is more appropriate than
CONFIG_PM. This patch replace all CONFIG_PM with CONFIG_PM_SLEEP for
virtio drivers that implement freeze and restore callbacks.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3b868a4073cdedf395f26d843874414e0e0e9cfd |
|
07-Aug-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: prevent use-after-free of port name in port unplug
Remove the debugfs path before freeing port->name, to prevent a possible
use-after-free.
Reported-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3f0d0c9b47e09d47fcb755fed786a1ee88e110b5 |
|
30-Jul-2013 |
Dan Carpenter <dan.carpenter@oracle.com> |
virtio: console: cleanup an error message
The PTR_ERR(NULL) here is not useful.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 314081f1025e9ea77b69261f21183e9be18a6f91 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: fix locking around send_sigio_to_port()
send_sigio_to_port() checks the value of guest_connected, which we
always modify under the inbuf_lock; make sure invocations of
send_sigio_to_port() have take the inbuf_lock around the call.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 5549fb25811710585d5ec77a0e6a1fbc8808df93 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: add locking in port unplug path
Port unplug can race with close() in port_fops_release().
port_fops_release() already takes the necessary locks, ensure
unplug_port() does that too.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| c6017e793b932e84b1c998f9b4c08d74ff0ea9c0 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: add locks around buffer removal in port unplug path
The removal functions act on the vqs, and the vq operations need to be
locked.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 96f97a83910cdb9d89d127c5ee523f8fc040a804 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: return -ENODEV on all read operations after unplug
If a port gets unplugged while a user is blocked on read(), -ENODEV is
returned. However, subsequent read()s returned 0, indicating there's no
host-side connection (but not indicating the device went away).
This also happened when a port was unplugged and the user didn't have
any blocking operation pending. If the user didn't monitor the SIGIO
signal, they won't have a chance to find out if the port went away.
Fix by returning -ENODEV on all read()s after the port gets unplugged.
write() already behaves this way.
CC: <stable@vger.kernel.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 92d3453815fbe74d539c86b60dab39ecdf01bb99 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: fix raising SIGIO after port unplug
SIGIO should be sent when a port gets unplugged. It should only be sent
to prcesses that have the port opened, and have asked for SIGIO to be
delivered. We were clearing out guest_connected before calling
send_sigio_to_port(), resulting in a sigio not getting sent to
processes.
Fix by setting guest_connected to false after invoking the sigio
function.
CC: <stable@vger.kernel.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| ea3768b4386a8d1790f4cc9a35de4f55b92d6442 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: clean up port data immediately at time of unplug
We used to keep the port's char device structs and the /sys entries
around till the last reference to the port was dropped. This is
actually unnecessary, and resulted in buggy behaviour:
1. Open port in guest
2. Hot-unplug port
3. Hot-plug a port with the same 'name' property as the unplugged one
This resulted in hot-plug being unsuccessful, as a port with the same
name already exists (even though it was unplugged).
This behaviour resulted in a warning message like this one:
-------------------8<---------------------------------------
WARNING: at fs/sysfs/dir.c:512 sysfs_add_one+0xc9/0x130() (Not tainted)
Hardware name: KVM
sysfs: cannot create duplicate filename
'/devices/pci0000:00/0000:00:04.0/virtio0/virtio-ports/vport0p1'
Call Trace:
[<ffffffff8106b607>] ? warn_slowpath_common+0x87/0xc0
[<ffffffff8106b6f6>] ? warn_slowpath_fmt+0x46/0x50
[<ffffffff811f2319>] ? sysfs_add_one+0xc9/0x130
[<ffffffff811f23e8>] ? create_dir+0x68/0xb0
[<ffffffff811f2469>] ? sysfs_create_dir+0x39/0x50
[<ffffffff81273129>] ? kobject_add_internal+0xb9/0x260
[<ffffffff812733d8>] ? kobject_add_varg+0x38/0x60
[<ffffffff812734b4>] ? kobject_add+0x44/0x70
[<ffffffff81349de4>] ? get_device_parent+0xf4/0x1d0
[<ffffffff8134b389>] ? device_add+0xc9/0x650
-------------------8<---------------------------------------
Instead of relying on guest applications to release all references to
the ports, we should go ahead and unregister the port from all the core
layers. Any open/read calls on the port will then just return errors,
and an unplug/plug operation on the host will succeed as expected.
This also caused buggy behaviour in case of the device removal (not just
a port): when the device was removed (which means all ports on that
device are removed automatically as well), the ports with active
users would clean up only when the last references were dropped -- and
it would be too late then to be referencing char device pointers,
resulting in oopses:
-------------------8<---------------------------------------
PID: 6162 TASK: ffff8801147ad500 CPU: 0 COMMAND: "cat"
#0 [ffff88011b9d5a90] machine_kexec at ffffffff8103232b
#1 [ffff88011b9d5af0] crash_kexec at ffffffff810b9322
#2 [ffff88011b9d5bc0] oops_end at ffffffff814f4a50
#3 [ffff88011b9d5bf0] die at ffffffff8100f26b
#4 [ffff88011b9d5c20] do_general_protection at ffffffff814f45e2
#5 [ffff88011b9d5c50] general_protection at ffffffff814f3db5
[exception RIP: strlen+2]
RIP: ffffffff81272ae2 RSP: ffff88011b9d5d00 RFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880118901c18 RCX: 0000000000000000
RDX: ffff88011799982c RSI: 00000000000000d0 RDI: 3a303030302f3030
RBP: ffff88011b9d5d38 R8: 0000000000000006 R9: ffffffffa0134500
R10: 0000000000001000 R11: 0000000000001000 R12: ffff880117a1cc10
R13: 00000000000000d0 R14: 0000000000000017 R15: ffffffff81aff700
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#6 [ffff88011b9d5d00] kobject_get_path at ffffffff8126dc5d
#7 [ffff88011b9d5d40] kobject_uevent_env at ffffffff8126e551
#8 [ffff88011b9d5dd0] kobject_uevent at ffffffff8126e9eb
#9 [ffff88011b9d5de0] device_del at ffffffff813440c7
-------------------8<---------------------------------------
So clean up when we have all the context, and all that's left to do when
the references to the port have dropped is to free up the port struct
itself.
CC: <stable@vger.kernel.org>
Reported-by: chayang <chayang@redhat.com>
Reported-by: YOGANANTH SUBRAMANIAN <anantyog@in.ibm.com>
Reported-by: FuXiangChun <xfu@redhat.com>
Reported-by: Qunfang Zhang <qzhang@redhat.com>
Reported-by: Sibiao Luo <sluo@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 671bdea2b9f210566610603ecbb6584c8a201c8c |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: fix race in port_fops_open() and port unplug
Between open() being called and processed, the port can be unplugged.
Check if this happened, and bail out.
A simple test script to reproduce this is:
while true; do for i in $(seq 1 100); do echo $i > /dev/vport0p3; done; done;
This opens and closes the port a lot of times; unplugging the port while
this is happening triggers the bug.
CC: <stable@vger.kernel.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 057b82be3ca3d066478e43b162fc082930a746c9 |
|
29-Jul-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: fix race with port unplug and open/close
There's a window between find_port_by_devt() returning a port and us
taking a kref on the port, where the port could get unplugged. Fix it
by taking the reference in find_port_by_devt() itself.
Problem reported and analyzed by Mateusz Guzik.
CC: <stable@vger.kernel.org>
Reported-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2b4fbf029dff5a28d9bf646346dea891ec43398a |
|
23-Jul-2013 |
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> |
virtio/console: Add pipe_lock/unlock for splice_write
Add pipe_lock/unlock for splice_write to avoid oops by following competition:
(1) An application gets fds of a trace buffer, virtio-serial, pipe.
(2) The application does fork()
(3) The processes execute splice_read(trace buffer) and
splice_write(virtio-serial) via same pipe.
<parent> <child>
get fds of a trace buffer,
virtio-serial, pipe
|
fork()----------create--------+
| |
splice(read) | ---+
splice(write) | +-- no competition
| splice(read) |
| splice(write) ---+
| |
splice(read) |
splice(write) splice(read) ------ competition
| splice(write)
Two processes share a pipe_inode_info structure. If the child execute
splice(read) when the parent tries to execute splice(write), the
structure can be broken. Existing virtio-serial driver does not get
lock for the structure in splice_write, so this competition will induce
oops.
<oops messages>
BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
IP: [<ffffffff811a6b5f>] splice_from_pipe_feed+0x6f/0x130
PGD 7223e067 PUD 72391067 PMD 0
Oops: 0000 [#1] SMP
Modules linked in: lockd bnep bluetooth rfkill sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_timer snd soundcore pcspkr virtio_net virtio_balloon i2c_piix4 i2c_core microcode uinput floppy
CPU: 0 PID: 1072 Comm: compete-test Not tainted 3.10.0ws+ #55
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
task: ffff880071b98000 ti: ffff88007b55e000 task.ti: ffff88007b55e000
RIP: 0010:[<ffffffff811a6b5f>] [<ffffffff811a6b5f>] splice_from_pipe_feed+0x6f/0x130
RSP: 0018:ffff88007b55fd78 EFLAGS: 00010287
RAX: 0000000000000000 RBX: ffff88007b55fe20 RCX: 0000000000000000
RDX: 0000000000001000 RSI: ffff88007a95ba30 RDI: ffff880036f9e6c0
RBP: ffff88007b55fda8 R08: 00000000000006ec R09: ffff880077626708
R10: 0000000000000003 R11: ffffffff8139ca59 R12: ffff88007a95ba30
R13: 0000000000000000 R14: ffffffff8139dd00 R15: ffff880036f9e6c0
FS: 00007f2e2e3a0740(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000018 CR3: 0000000071bd1000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffffffff8139ca59 ffff88007b55fe20 ffff880036f9e6c0 ffffffff8139dd00
ffff8800776266c0 ffff880077626708 ffff88007b55fde8 ffffffff811a6e8e
ffff88007b55fde8 ffffffff8139ca59 ffff880036f9e6c0 ffff88007b55fe20
Call Trace:
[<ffffffff8139ca59>] ? alloc_buf.isra.13+0x39/0xb0
[<ffffffff8139dd00>] ? virtcons_restore+0x100/0x100
[<ffffffff811a6e8e>] __splice_from_pipe+0x7e/0x90
[<ffffffff8139ca59>] ? alloc_buf.isra.13+0x39/0xb0
[<ffffffff8139d739>] port_fops_splice_write+0xe9/0x140
[<ffffffff8127a3f4>] ? selinux_file_permission+0xc4/0x120
[<ffffffff8139d650>] ? wait_port_writable+0x1b0/0x1b0
[<ffffffff811a6fe0>] do_splice_from+0xa0/0x110
[<ffffffff811a951f>] SyS_splice+0x5ff/0x6b0
[<ffffffff8161facf>] tracesys+0xdd/0xe2
Code: 49 8b 87 80 00 00 00 4c 8d 24 d0 8b 53 04 41 8b 44 24 0c 4d 8b 6c 24 10 39 d0 89 03 76 02 89 13 49 8b 44 24 10 4c 89 e6 4c 89 ff <ff> 50 18 85 c0 0f 85 aa 00 00 00 48 89 da 4c 89 e6 4c 89 ff 41
RIP [<ffffffff811a6b5f>] splice_from_pipe_feed+0x6f/0x130
RSP <ffff88007b55fd78>
CR2: 0000000000000018
---[ end trace 24572beb7764de59 ]---
V2: Fix a locking problem for error
V3: Add Reviewed-by lines and stable@ line in sign-off area
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 68c034fefe20eaf7d5569aae84584b07987ce50a |
|
23-Jul-2013 |
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> |
virtio/console: Quit from splice_write if pipe->nrbufs is 0
Quit from splice_write if pipe->nrbufs is 0 for avoiding oops in virtio-serial.
When an application was doing splice from a kernel buffer to virtio-serial on
a guest, the application received signal(SIGINT). This situation will normally
happen, but the kernel executed a kernel panic by oops as follows:
BUG: unable to handle kernel paging request at ffff882071c8ef28
IP: [<ffffffff812de48f>] sg_init_table+0x2f/0x50
PGD 1fac067 PUD 0
Oops: 0000 [#1] SMP
Modules linked in: lockd sunrpc bnep bluetooth rfkill ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_timer snd microcode virtio_balloon virtio_net pcspkr soundcore i2c_piix4 i2c_core uinput floppy
CPU: 1 PID: 908 Comm: trace-cmd Not tainted 3.10.0+ #49
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
task: ffff880071c64650 ti: ffff88007bf24000 task.ti: ffff88007bf24000
RIP: 0010:[<ffffffff812de48f>] [<ffffffff812de48f>] sg_init_table+0x2f/0x50
RSP: 0018:ffff88007bf25dd8 EFLAGS: 00010286
RAX: 0000001fffffffe0 RBX: ffff882071c8ef28 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880071c8ef48
RBP: ffff88007bf25de8 R08: ffff88007fd15d40 R09: ffff880071c8ef48
R10: ffffea0001c71040 R11: ffffffff8139c555 R12: 0000000000000000
R13: ffff88007506a3c0 R14: ffff88007c862500 R15: ffff880071c8ef00
FS: 00007f0a3646c740(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff882071c8ef28 CR3: 000000007acbb000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffff880071c8ef48 ffff88007bf25e20 ffff88007bf25e88 ffffffff8139d6fa
ffff88007bf25e28 ffffffff8127a3f4 0000000000000000 0000000000000000
ffff880071c8ef48 0000100000000000 0000000000000003 ffff88007bf25e08
Call Trace:
[<ffffffff8139d6fa>] port_fops_splice_write+0xaa/0x130
[<ffffffff8127a3f4>] ? selinux_file_permission+0xc4/0x120
[<ffffffff8139d650>] ? wait_port_writable+0x1b0/0x1b0
[<ffffffff811a6fe0>] do_splice_from+0xa0/0x110
[<ffffffff811a951f>] SyS_splice+0x5ff/0x6b0
[<ffffffff8161f8c2>] system_call_fastpath+0x16/0x1b
Code: c1 e2 05 48 89 e5 48 83 ec 10 4c 89 65 f8 41 89 f4 31 f6 48 89 5d f0 48 89 fb e8 8d ce ff ff 41 8d 44 24 ff 48 c1 e0 05 48 01 c3 <48> 8b 03 48 83 e0 fe 48 83 c8 02 48 89 03 48 8b 5d f0 4c 8b 65
RIP [<ffffffff812de48f>] sg_init_table+0x2f/0x50
RSP <ffff88007bf25dd8>
CR2: ffff882071c8ef28
---[ end trace 86323505eb42ea8f ]---
It seems to induce pagefault in sg_init_tabel() when pipe->nrbufs is equal to
zero. This may happen in a following situation:
(1) The application normally does splice(read) from a kernel buffer, then does
splice(write) to virtio-serial.
(2) The application receives SIGINT when is doing splice(read), so splice(read)
is failed by EINTR. However, the application does not finish the operation.
(3) The application tries to do splice(write) without pipe->nrbufs.
(4) The virtio-console driver tries to touch scatterlist structure sgl in
sg_init_table(), but the region is out of bound.
To avoid the case, a kernel should check whether pipe->nrbufs is empty or not
when splice_write is executed in the virtio-console driver.
V3: Add Reviewed-by lines and stable@ line in sign-off area.
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 74ff582cd65ad01c45f1971feac28f23b7eb2687 |
|
14-Apr-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: replace EMFILE with EBUSY for already-open port
Returning EMFILE (process has too many open files) is incorrect to
indicate a port is already open by another process. Use EBUSY for that.
This does change what we report to userspace, but I believe userspace
can look at it this way: it gets EBUSY, a new error code, instead of
EMFILE. It's still an error, and that's not changing.
Reported-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3826835ab8bb7eac47f14f279df2bd58ec2bb279 |
|
08-Apr-2013 |
Wei Yongjun <yongjun_wei@trendmicro.com.cn> |
virtio_console: make local symbols static
Those symbols only used within this file, and should be static.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 9ba5c80b1aea8648a3efe5f22dc1f7cacdfbeeb8 |
|
29-Mar-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: add locking around c_ovq operations
When multiple ovq operations are being performed (lots of open/close
operations on virtio_console fds), the __send_control_msg() function can
get confused without locking.
A simple recipe to cause badness is:
* create a QEMU VM with two virtio-serial ports
* in the guest, do
while true;do echo abc >/dev/vport0p1;done
while true;do echo edf >/dev/vport0p2;done
In one run, this caused a panic in __send_control_msg(). In another, I
got
virtio_console virtio0: control-o:id 0 is not a head!
This also results repeated messages similar to these on the host:
qemu-kvm: virtio-serial-bus: Unexpected port id 478762112 for device virtio-serial-bus.0
qemu-kvm: virtio-serial-bus: Unexpected port id 478762368 for device virtio-serial-bus.0
Reported-by: FuXiangChun <xfu@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Asias He <asias@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
|
| 165b1b8bbc17c9469b053bab78b11b7cbce6d161 |
|
29-Mar-2013 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: rename cvq_lock to c_ivq_lock
The cvq_lock was taken for the c_ivq. Rename the lock to make that
obvious.
We'll also add a lock around the c_ovq in the next commit, so there's no
ambiguity.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Asias He <asias@redhat.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
|
| 6797999d99587e7b4189cf24c8f1053e02444703 |
|
20-Mar-2013 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio_console: use simplified virtqueue accessors.
We never add buffers with input and output parts, so use the new accessors.
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| aabd6a8fa5a933bdf968cd86e34122745c1960e8 |
|
18-Mar-2013 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
Revert "virtio_console: Initialize guest_connected=true for rproc_serial"
This reverts commit 8078db789a92b10ff6e2d713231b5367e014c53b, and
adds a lengthy comment explaining the problem area.
The reverted patch caused opening of ports to fail for rproc_serial.
In probe guest_connected was set to true, but port_fops_open()
fails with -EMFILE if guest_connected already is true.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 8078db789a92b10ff6e2d713231b5367e014c53b |
|
13-Feb-2013 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Initialize guest_connected=true for rproc_serial
When rproc_serial is initialized, guest_connected should be set
to true. We can then revert the extra checks introduced in
commit: "virtio_console: Let unconnected rproc device receive data."
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| dc18f0800f5f16460030a9623d4fcc165d607edf |
|
12-Feb-2013 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Use virtio device index to generate port name
Use virtio device index for creating unique device port names.
Current index allocation in virtio is based on a monotonically
increasing variable "index". A better handling of this is to
use device index which is allocated by ida.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| aded024a12b32fc1ed9a80639681daae2d07ec25 |
|
22-Jan-2013 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Don't access uninitialized data.
Don't access uninitialized work-queue when removing device.
The work queue is initialized only if the device multi-queue.
So don't call cancel_work unless this is a multi-queue device.
This fixes the following panic:
Kernel panic - not syncing: BUG!
Call Trace:
62031b28: [<6026085d>] panic+0x16b/0x2d3
62031b30: [<6004ef5e>] flush_work+0x0/0x1d7
62031b60: [<602606f2>] panic+0x0/0x2d3
62031b68: [<600333b0>] memcpy+0x0/0x140
62031b80: [<6002d58a>] unblock_signals+0x0/0x84
62031ba0: [<602609c5>] printk+0x0/0xa0
62031bd8: [<60264e51>] __mutex_unlock_slowpath+0x13d/0x148
62031c10: [<6004ef5e>] flush_work+0x0/0x1d7
62031c18: [<60050234>] try_to_grab_pending+0x0/0x17e
62031c38: [<6004e984>] get_work_gcwq+0x71/0x8f
62031c48: [<60050539>] __cancel_work_timer+0x5b/0x115
62031c78: [<628acc85>] unplug_port+0x0/0x191 [virtio_console]
62031c98: [<6005061c>] cancel_work_sync+0x12/0x14
62031ca8: [<628ace96>] virtcons_remove+0x80/0x15c [virtio_console]
62031ce8: [<628191de>] virtio_dev_remove+0x1e/0x7e [virtio]
62031d08: [<601cf242>] __device_release_driver+0x75/0xe4
62031d28: [<601cf2dd>] device_release_driver+0x2c/0x40
62031d48: [<601ce0dd>] driver_unbind+0x7d/0xc6
62031d88: [<601cd5d9>] drv_attr_store+0x27/0x29
62031d98: [<60115f61>] sysfs_write_file+0x100/0x14d
62031df8: [<600b737d>] vfs_write+0xcb/0x184
62031e08: [<600b58b8>] filp_close+0x88/0x94
62031e38: [<600b7686>] sys_write+0x59/0x88
62031e88: [<6001ced1>] handle_syscall+0x5d/0x80
62031ea8: [<60030a74>] userspace+0x405/0x531
62031f08: [<600d32cc>] sys_dup+0x0/0x5e
62031f28: [<601b11d6>] strcpy+0x0/0x18
62031f38: [<600be46c>] do_execve+0x10/0x12
62031f48: [<600184c7>] run_init_process+0x43/0x45
62031fd8: [<60019a91>] new_thread_handler+0xba/0xbc
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Cc: stable@kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 1f8051876a194d7f7fe7834d9853f240d6b4b9ab |
|
22-Jan-2013 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Let unconnected rproc device receive data.
Allow rproc serial ports to receive data before the port
is connected.
Rproc serial ports usually talk to very simple remote devices
with no control queue managing open/close events. So we must
let remote devices write to the virtio ring even if the device
is not yet fully initialized.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| bcd2982a0e2af8d0506271b439af4b568fc33fdc |
|
22-Dec-2012 |
Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
Drivers: char: remove __dev* attributes.
CONFIG_HOTPLUG is going away as an option. As a result, the __dev*
markings need to be removed.
This change removes the use of __devinit, __devexit_p, __devinitdata,
__devinitconst, and __devexit from these drivers.
Based on patches originally written by Bill Pemberton, but redone by me
in order to handle some of the coding style issues better, by hand.
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: David Airlie <airlied@linux.ie>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
| 1b6370463e88b0c1c317de16d7b962acc1dab4f2 |
|
14-Dec-2012 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Add support for remoteproc serial
Add a simple serial connection driver called
VIRTIO_ID_RPROC_SERIAL (11) for communicating with a
remote processor in an asymmetric multi-processing
configuration.
This implementation reuses the existing virtio_console
implementation, and adds support for DMA allocation
of data buffers and disables use of tty console and
the virtio control queue.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 276a3e954cfe4da7c492c9063741f99290d2973e |
|
14-Dec-2012 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Merge struct buffer_token into struct port_buffer
Refactoring the splice functionality by unifying the approach for
sending scatter-lists and regular buffers. This simplifies
buffer handling and reduces code size. Splice will now allocate
a port_buffer and send_buf() and free_buf() can always be used
for any buffer.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| eb34f12b509823571e88b791ae2088280943894f |
|
16-Nov-2012 |
sjur.brandeland@stericsson.com <sjur.brandeland@stericsson.com> |
virtio_console: Free buffers from out-queue upon close
Free pending output buffers from the virtio out-queue when
host has acknowledged port_close.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (rebased & cut down)
|
| 0127f6855e643c6b8fd5fbe3b5fa23c9d26cd237 |
|
15-Oct-2012 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Use kmalloc instead of kzalloc
Avoid the more cpu expensive kzalloc when allocating buffers.
Originally kzalloc was intended for isolating the guest from
the host by not sending random guest data to the host. But device
isolation is not yet in place so kzalloc is not really needed.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| fe5295374ec9ac56ba3b619c5c1792b3fd66d859 |
|
15-Oct-2012 |
Sjur Brændeland <sjur.brandeland@stericsson.com> |
virtio_console: Free buffer if splice fails
Free the allocated scatter list if send_pages fails in function
port_splice_write.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 589575a23562b588c82bdb57ed8c09bee5f0f174 |
|
16-Oct-2012 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: make it clear that virtqueue_add_buf() no longer returns > 0
We simplified virtqueue_add_buf(), make it clear in the callers.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 49e86f16866fbf8e3c9a6b0770eb6f3c167f4b72 |
|
10-Dec-2012 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: don't rely on virtqueue_add_buf() returning capacity.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2223cbec33ef3a26e7678be89de75cb60c4c257b |
|
19-Nov-2012 |
Bill Pemberton <wfp5p@virginia.edu> |
char: remove use of __devinit
CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Mattia Dongili <malattia@linux.it>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: openipmi-developer@lists.sourceforge.net
Cc: linuxppc-dev@lists.ozlabs.org
Cc: cbe-oss-dev@lists.ozlabs.org
Cc: platform-driver-x86@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
| 33e1afc3d82697599ccc8dc8f2fa44ffff5ae329 |
|
01-Sep-2012 |
Alexey Khoroshilov <khoroshilov@ispras.ru> |
virtio: console: fix error handling in init() function
If register_virtio_driver() fails, virtio-ports class is not destroyed.
The patch adds error handling of register_virtio_driver().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 8ca84a50e5b39487ea1de8809d0ee1c8474f6a5c |
|
09-Aug-2012 |
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
virtio/console: Allocate scatterlist according to the current pipe size
Allocate scatterlist according to the current pipe size.
This allows splicing bigger buffer if the pipe size has
been changed by fcntl.
Changes in v2:
- Just a minor fix for avoiding a confliction with previous patch.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| efe75d24a69fc39bb09d882ca2d5b90d4da02afe |
|
09-Aug-2012 |
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
virtio/console: Wait until the port is ready on splice
Wait if the port is not connected or full on splice
like as write is doing.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| ec8fc870156b2b144f55b6a5a7d135018f04b30e |
|
09-Aug-2012 |
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
virtio/console: Add a failback for unstealable pipe buffer
Add a failback memcpy path for unstealable pipe buffer.
If buf->ops->steal() fails, virtio-serial tries to
copy the page contents to an allocated page, instead
of just failing splice().
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| eb5e89fc70bb3f115b3206ed0c57d3aba1fdd155 |
|
09-Aug-2012 |
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
virtio/console: Add splice_write support
Enable to use splice_write from pipe to virtio-console port.
This steals pages from pipe and directly send it to host.
Note that this may accelerate only the guest to host path.
Changes in v2:
- Use GFP_KERNEL instead of GFP_ATOMIC in syscall context function.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| efda0ad4aa92439d9244d77a13339e23df5e1dc1 |
|
01-Sep-2012 |
Alexey Khoroshilov <khoroshilov@ispras.ru> |
virtio: console: fix error handling in init() function
If register_virtio_driver() fails, virtio-ports class is not destroyed.
The patch adds error handling of register_virtio_driver().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
| fa8b66ccd2d200b64496cfedcce90bf54fe7d6e9 |
|
25-Apr-2012 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: tell host of open ports after resume from s3/s4
If a port was open before going into one of the sleep states, the port
can continue normal operation after restore. However, the host has to
be told that the guest side of the connection is open to restore
pre-suspend state.
This wasn't noticed so far due to a bug in qemu that was fixed recently
(which marked the guest-side connection as always open).
CC: stable@vger.kernel.org # Only for 3.3
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
| 234e340582901211f40d8c732afc49f0630ecf05 |
|
05-Apr-2012 |
Stephen Boyd <sboyd@codeaurora.org> |
simple_open: automatically convert to simple_open()
Many users of debugfs copy the implementation of default_open() when
they want to support a custom read/write function op. This leads to a
proliferation of the default_open() implementation across the entire
tree.
Now that the common implementation has been consolidated into libfs we
can replace all the users of this function with simple_open().
This replacement was done with the following semantic patch:
<smpl>
@ open @
identifier open_f != simple_open;
identifier i, f;
@@
-int open_f(struct inode *i, struct file *f)
-{
(
-if (i->i_private)
-f->private_data = i->i_private;
|
-f->private_data = i->i_private;
)
-return 0;
-}
@ has_open depends on open @
identifier fops;
identifier open.open_f;
@@
struct file_operations fops = {
...
-.open = open_f,
+.open = simple_open,
...
};
</smpl>
[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
| c743d09dbd018dd6345519fb3264b16bdaa41746 |
|
06-Jan-2012 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Disable callbacks for virtqueues at start of S4 freeze
To ensure we don't receive any more interrupts from the host after we
enter the freeze function, disable all vq interrupts.
There wasn't any problem seen due to this in tests, but applying this
patch makes the freeze case more robust.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2b8f41d846990c3c1c8addbaed2cf53c3ef91d25 |
|
22-Dec-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add freeze and restore handlers to support S4
Remove all vqs and associated buffers in the freeze callback which
prepares us to go into hibernation state. On restore, re-create all the
vqs and populate the input vqs with buffers to get to the pre-hibernate
state.
Note: Any outstanding unconsumed buffers are discarded; which means
there's a possibility of data loss in case the host or the guest didn't
consume any data already present in the vqs. This can be addressed in a
later patch series, perhaps in virtio common code.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a0e2dbfc223028b72a1c193f94fcd3f67253ba4a |
|
22-Dec-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Move vq and vq buf removal into separate functions
This common code will be shared with the PM freeze function.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f96fde41f7f9af6cf20f6a1919f5d9670f84d574 |
|
12-Jan-2012 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: rename virtqueue_add_buf_gfp to virtqueue_add_buf
Remove wrapper functions. This makes the allocation type explicit in
all callers; I used GPF_KERNEL where it seemed obvious, left it at
GFP_ATOMIC otherwise.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Christoph Hellwig <hch@lst.de>
|
| 5e38483b350405542c8080134408fd8897394ba2 |
|
22-Sep-2011 |
Christian Borntraeger <borntraeger@de.ibm.com> |
virtio: console: wait for first console port for early console output
On s390 I have seen some random
"Warning: unable to open an initial console"
boot failure. Turns out that tty_open fails, because the
hvc_alloc was not yet done. In former times this could not happen,
since the probe function automatically called hvc_alloc. With newer
versions (multiport) some host<->guest interaction is required
before hvc_alloc is called. This might be too late, especially if
an initramfs is involved. Lets use a completion if we have
multiport and an early console.
[Amit:
* Use NULL instead of 0 for pointer comparison
* Rename 'port_added' to 'early_console_added'
* Re-format, re-word commit message
* Rebase patch on top of current queue]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Acked-by: Chrstian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 17e5b4f20adbe286fdf14b4d08f296564e97e545 |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: add port stats for bytes received, sent and discarded
This commit adds port-specific stats for the number of bytes received,
sent and discarded. They're exposed via the debugfs interface. This
data can be used to check for data loss bugs (or disprove such claims).
It can also be used for accounting, if there's such a need.
The stats remain valid throughout the lifetime of the port. Unplugging
a port will reset the stats. The numbers are not reset across port
opens/closes.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2d24cdaa6e389f85dad51eda39f1c2684a4f15b0 |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: make discard_port_data() use get_inbuf()
discard_port_data() used virtqueue_get_buf() directly instead of using
get_inbuf(). Fix this, so that we get accounting for all received
bytes. This also simplifies the code a lot.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| ce072a0cee420782ed0a079ac17c7ca26056fb95 |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: rename variable
'ret' is a misnomer in discard_port_data() since we don't return the
value. Rename it to 'err'.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| d25a9ddae93ca97aa03fdab1363baf0e0c35d960 |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: make get_inbuf() return port->inbuf if present
Instead of pulling in a buffer from the vq each time it's called,
get_inbuf() now checks if the current active buffer, in port->inbuf is
valid. If it is, just returns a pointer to it. This ends up
simplifying a lot of code calling get_inbuf() since the check for
port->inbuf being valid was done by all the callers.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| defde66996476295dc7b1b60ea318965f8c3ad86 |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fix return type for get_inbuf()
get_inbuf() returns void *. There's no reason to return void pointers
instead of the correct struct port_buffer *.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a08fa92d16f2fa112e3400c6c513d23ae78b960a |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Use wait_event_freezable instead of _interruptible
Get ready to support suspend/resume by using the freezable calls so that
blocking read/write syscalls are handled properly across suspend/resume.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 291024ef351328e7b4ca6bae798abc816a43653c |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Ignore port name update request if name already set
We don't allow port name changes dynamically for a port. So any
requests by the host to change the name are ignored.
Before this patch, if the hypervisor sent a port name while we had one
set already, we would leak memory equivalent to the size of the old
name.
This scenario wasn't expected so far, but with the suspend-resume
support, we'll send the VIRTIO_CONSOLE_PORT_READY message after restore,
which can get us into this situation.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 286f9a226f11e4a05d08999417fd838c0ca91d7a |
|
14-Sep-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fix indentation
Convert spaces to tabs and fix indentation for an if statement split
into multiple lines.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 51c6d61ac58844b5e3e0d28271084c06f6a15371 |
|
14-Aug-2011 |
Sasha Levin <levinsasha928@gmail.com> |
virtio-console: Use virtio_config_val() for retrieving config
This patch modifies virtio-console to use virtio_config_val() instead
of a 'if(virtio_has_feature()) vdev->config->get()' construct to retrieve
optional values from the config space.
Cc: Amit Shah <amit.shah@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| c22405c98d3ff7042e369370d2bf54f9607d0f09 |
|
03-Jul-2011 |
Paul Gortmaker <paul.gortmaker@windriver.com> |
drivers/char: Add module.h to those who were using it implicitly
A pending cleanup will mean that module.h won't be implicitly
everywhere anymore. Make sure the modular drivers in char are
actually calling out for <module.h> explicitly in advance.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
|
| 177dbd95637a52b9118aca757d5856ec3995d3e7 |
|
30-May-2011 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio console: don't manually set or finalize VIRTIO_CONSOLE_F_MULTIPORT.
That's already been done by the virtio infrastructure before the probe
function is called.
Reported-by: alexey.kardashevskiy@au1.ibm.com
Acked-by: Amit Shah <amit.shah@redhat.com>
Tested-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| afa2689e19073cd2e762d0f2c1358fab1ab9f18c |
|
14-Mar-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Enable call to hvc_remove() on console port remove
This call was disabled as hot-unplugging one virtconsole port led to
another virtconsole port freezing.
Upon testing it again, this now works, so enable it.
In addition, a bug was found in qemu wherein removing a port of one type
caused the guest output from another port to stop working. I doubt it
was just this bug that caused it (since disabling the hvc_remove() call
did allow other ports to continue working), but since it's all solved
now, we're fine with hot-unplugging of virtconsole ports.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| d7a62cd0332115d4c7c4689abea0d889a30d8349 |
|
04-Mar-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Don't access vqs if device was unplugged
If a virtio-console device gets unplugged while a port is open, a
subsequent close() call on the port accesses vqs to free up buffers.
This can lead to a crash.
The buffers are already freed up as a result of the call to
unplug_ports() from virtcons_remove(). The fix is to simply not access
vq information if port->portdev is NULL.
Reported-by: juzhang <juzhang@redhat.com>
CC: stable@kernel.org
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
| 51df0acc3d76cf41d5496ef044cc5717ab5c7f71 |
|
01-Feb-2011 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Move file back to drivers/char/
Commit 728674a7e466628df2aeec6d11a2ae1ef968fb67 moved virtio_console.c
to drivers/tty/hvc/ under the perception of this being an hvc driver.
It was such once, but these days it has generic communication
capabilities as well, so move it to drivers/char/.
In the future, the hvc part from this file can be split off and moved
under drivers/tty/hvc/.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
| 728674a7e466628df2aeec6d11a2ae1ef968fb67 |
|
13-Jan-2011 |
Greg Kroah-Hartman <gregkh@suse.de> |
tty: move hvc drivers to drivers/tty/hvc/
As requested by Arnd Bergmann, the hvc drivers are now
moved to the drivers/tty/hvc/ directory. The virtio_console.c driver
was also moved, as it required the hvc_console.h file to be able to be
built, and it really is a hvc driver.
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
| 22e132ff2645aab1e1a25c45e9544a39ae1dc106 |
|
06-Nov-2010 |
Jiri Slaby <jslaby@suse.cz> |
Char: virtio_console, fix memory leak
Stanse found that in init_vqs, memory is leaked under certain
circumstanses (the fail path order is incorrect). Fix that by checking
allocations in one turn and free all of them at once if some fails
(some may be NULL, but this is OK).
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 299fb61c08c2fcd1bb6d3a4e87e53dc368475416 |
|
16-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Disable lseek(2) for port file operations
The ports are char devices; do not have seeking capabilities. Calling
nonseekable_open() from the fops_open() call and setting the llseek fops
pointer to no_llseek ensures an lseek() call from userspace returns
-ESPIPE.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a461e11e7b8ca2705889bcf9582f6a8f84884bd2 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Send SIGIO in case of port unplug
If a port has registered for SIGIO signals, let the application
know that the port is getting unplugged.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 55f6bcce3691f68476a530daa6666b66c43420a8 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Send SIGIO on new data arrival on ports
Send a SIGIO signal when new data arrives on a port. This is sent only
when the process has requested for the signal to be sent using fcntl().
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3eae0adea949d8fdd8fa3e5301192901219d2c64 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Send SIGIO to processes that request it for host events
A process can request for SIGIO on host connect / disconnect events
using the O_ASYNC file flag using fcntl().
If that's requested, and if the guest-side connection for the port is
open, any host-side open/close events for that port will raise a SIGIO.
The process can then use poll() within the signal handler to find out
which port triggered the signal.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| e062013c7d22e40ee634b818d28fd615db36998e |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Reference counting portdev structs is not needed
Explain in a comment why there's no need to reference-count the portdev
struct: when a device is yanked out, we can't do anything more with it
anyway so just give up doing anything more with the data or the vqs and
exit cleanly.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| b353a6b821627053f82b4e7b907e824cb7a6879c |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add reference counting for port struct
When a port got hot-unplugged, when a port was open, any file operation
after the unplugging resulted in a crash. This is fixed by ref-counting
the port structure, and releasing it only when the file is closed.
This splits the unplug operation in two parts: first marks the port
as unavailable, removes all the buffers in the vqs and removes the port
from the per-device list of ports. The second stage, invoked when all
references drop to zero, releases the chardev and frees all other memory.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| d22a69892bd8f29e3096f6f54c2c00d8aec2e796 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Use cdev_alloc() instead of cdev_init()
This moves to using cdev on the heap instead of it being embedded in the
ports struct. This helps individual refcounting and will allow us to
properly remove cdev structs after hot-unplugs and close operations.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 04950cdf071b6e5aa4794c93ad3e3ce8a1c4aa8c |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add a find_port_by_devt() function
To convert to using cdev as a pointer to avoid kref troubles, we have to
use a different method to get to a port from an inode than the current
container_of method.
Add find_port_by_devt() that looks up all portdevs and ports with those
portdevs to find the right port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 6bdf2afd02ae12bf8ac93e6d14c4b4dfef7c4c59 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add a list of portdevs that are active
The virtio_console.c driver is capable of handling multiple devices at a
time. Maintain a list of devices for future traversal.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 8ad37e83c8dc413f92b10c3d9bdeabe9237f521d |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: open: Use a common path for error handling
Just re-arrange code for future patches.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 7a2853178dfba9553d58f356113f47fd582e9cc6 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: remove_port() should return void
When a port is removed, we have to assume the port is gone. So a
success/failure return value doesn't make sense.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f4028119714e452f9b49377ec55e0ed1e5d1dfa4 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Make write() return -ENODEV on hot-unplug
When a port is hot-unplugged while an app was blocked on a write() call,
the call was unblocked but would not get an error returned.
Return -ENODEV to ensure the app knows the port has gone away.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| b3dddb9e6ddab74327f5557c1a6640ea0f56ad1c |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Make read() return -ENODEV on hot-unplug
When a port is hot-unplugged while an app was blocked on a read() call,
the call was unblocked but would not get an error returned.
Return -ENODEV to ensure the app knows the port has gone away.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 8529a504273d4efa6bb004dcd6ef28fe67b64ae9 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Unblock poll on port hot-unplug
When a port is hot-unplugged while an app is blocked on poll(), unblock
the poll() and return.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3709ea7ae7d698b428576c2db0bbb6e08a18cf12 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Un-block reads on chardev close
If a chardev is closed, any blocked read / poll calls should just return
and not attempt to use other state.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 84ec06c59a14d0941dd58ca6793b24a7e86b3b85 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Check if portdev is valid in send_control_msg()
A portdev may have been hot-unplugged while a port was open()ed. Skip
sending control messages when the portdev isn't valid.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 96eb872b2a041b1536ccc6ae2fa87eb28f6e2bb2 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Remove control vq data only if using multiport support
If a portdev isn't using multiport support, it won't have any control vq
data to remove.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 02238959944ce031f066f21e541a14933aca6575 |
|
02-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Reset vdev before removing device
The virtqueues should be disabled before attempting to remove the
device.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 531295e63be8c2b8b909d7400739e8b8df60d61f |
|
20-Oct-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Don't block entire guest if host doesn't read data
If the host is slow in reading data or doesn't read data at all,
blocking write calls not only blocked the program that called write()
but the entire guest itself.
To overcome this, let's not block till the host signals it has given
back the virtio ring element we passed it. Instead, send the buffer to
the host and return to userspace. This operation then becomes similar
to how non-blocking writes work, so let's use the existing code for this
path as well.
This code change also ensures blocking write calls do get blocked if
there's not enough room in the virtio ring as well as they don't return
-EAGAIN to userspace.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
CC: stable@kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
| 65745422a898741ee0e7068ef06624ab06e8aefa |
|
14-Sep-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Prevent userspace from submitting NULL buffers
A userspace could submit a buffer with 0 length to be written to the
host. Prevent such a situation.
This was not needed previously, but recent changes in the way write()
works exposed this condition to trigger a virtqueue event to the host,
causing a NULL buffer to be sent across.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: stable@kernel.org
|
| 6df7aadcd9290807c464675098b5dd2dc9da5075 |
|
16-Sep-2010 |
Hans de Goede <hdegoede@redhat.com> |
virtio: console: Fix poll blocking even though there is data to read
I found this while working on a Linux agent for spice, the symptom I was
seeing was select blocking on the spice vdagent virtio serial port even
though there were messages queued up there.
virtio_console's port_fops_poll checks port->inbuf != NULL to determine
if read won't block. However if an application reads enough bytes from
inbuf through port_fops_read, to empty the current port->inbuf,
port->inbuf will be NULL even though there may be buffers left in the
virtqueue.
This causes poll() to block even though there is data to be read,
this patch fixes this by using will_read_block(port) instead of the
port->inbuf != NULL check.
Signed-off-By: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
|
| 60e5e0b84045ce0f6ab07a02c7fcd6627b53d2d3 |
|
27-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fix crash when port is unplugged and blocked for write
When a program that has a virtio port opened and blocked for a write
operation, a port hot-unplug event will later led to a crash when
SIGTERM was sent to the program. Fix that.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 0047634d3daebca9e99a22eb89167bf77f35cdfa |
|
27-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fix crash when hot-unplugging a port and read is blocked
When removing a port we don't check if a program was blocked for read.
This leads to a crash when SIGTERM is sent to the program after
hot-unplugging the port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 0643e4c6e4fd67778fa886a89e6ec2320e0ff4d3 |
|
15-May-2010 |
Julia Lawall <julia@diku.dk> |
drivers/char: Eliminate use after free
In each case, the first argument to send_control_msg or __send_control_msg,
respectively, has either not been successfully allocated or has been freed
at the point of the call. In the first case, the first argument, port, is
only used to access the portdev and id fields, in order to call
__send_control_msg. Thus it seems possible instead to call
__send_control_msg directly. In the second case, the call to
__send_control_msg is moved up to a place where it seems like the first
argument, portdev, has been initialized sufficiently to make the call to
__send_control_msg meaningful.
This has only been compile tested.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// <smpl>
@free@
expression E;
position p;
@@
kfree@p(E)
@@
expression free.E, subE<=free.E, E1;
position free.p;
@@
kfree@p(E)
...
(
subE = E1
|
* E
)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 8345adbf96fc1bde7d9846aadbe5af9b2ae90882 |
|
05-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Accept console size along with resize control message
The VIRTIO_CONSOLE_RESIZE control message sent to us by the host now
contains the new {rows, cols} values for the console. This ensures each
console port gets its own size, and we don't depend on the config-space
rows and cols values at all now.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
CC: linuxppc-dev@ozlabs.org
CC: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 9778829cffd4d8d68c7e457645f958a82d4c4d8b |
|
05-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Store each console's size in the console structure
With support for multiple consoles, just using one {rows,cols} pair in
the config space is not going to suffice.
Store each console's size as part of the console struct.
This changes the behaviour for one case when multiport is not enabled:
when notifier_add_vio() is called, the console size is taken from that
of the last config-space update instead of fetching it afresh from the
config space.
Also add a helper to update the size in the console struct as we'll need
to use the same code to update the size via control messages when
multiport support is enabled.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
CC: linuxppc-dev@ozlabs.org
CC: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 4038f5b767a610c5a5d92d7047755c663ead1568 |
|
05-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Resize console port 0 on config intr only if multiport is off
When using multiport, we'll use control messages. Ensure we don't
accidentally update port 0 size on config interrupts.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
CC: linuxppc-dev@ozlabs.org
CC: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| cdfadfc1adb87fc7e8a631b1f299715feacbde90 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add support for nonblocking write()s
If the host port is not open, a write() should either just return if the
file is opened in non-blocking mode, or block till the host port is
opened.
Also, don't spin till host consumes data for nonblocking ports. For
non-blocking ports, we can do away with the spinning and reclaim the
buffers consumed by the host on the next write call or on the condition
that'll make poll return.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 60caacd3eeab68672961e88db01e26735527d521 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Rename wait_is_over() to will_read_block()
We'll introduce a function that checks if write will block. Have
function names that are similar for the two cases.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 1d05160be743c506b1d6926e7c637496fa750cd3 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Don't always create a port 0 if using multiport
If we're using multiport, there's no point in always creating a console
port. Create the console port only if the host doesn't support
multiport.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f909f850d666e3dbac1ee7c9d5d83416bd02f84e |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Use a control message to add ports
Instead of the host and guest independently enumerating ports, switch to
a control message to add ports where the host supplies the port number
so there's no ambiguity or a possibility of a race between the host and
the guest port numbers.
We now no longer need the 'nr_ports' config value. Since no kernel has
been released with the MULTIPORT changes yet, we have a chance to fiddle
with the config space without adding compatibility features.
This is beneficial for management software, which would now be able to
instantiate ports at known locations and avoid problems that arise with
implicit numbering in the host and the guest. This removes the 'guessing
game' part of it, and management software can now actually indicate
which id to spawn a particular port on.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| c446f8fcc9fba3369bffb894b31756cf7a09f783 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Move code around for future patches
We're going to use add_port() from handle_control_message() in the next
patch.
Move the add_port() and fill_queue(), which depends on it, above
handle_control_message() to avoid forward declarations.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 99f905f88a5b8478755605e08ed4bce40034cc6c |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Remove config work handler
We're going to switch to using control messages for port hot-plug and
initial port discovery. Remove the config work handler which handled
port hot-plug so far.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 69eb9a9f69572c0ebe08a0a46f56bdfdcdaa19a0 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Don't call hvc_remove() on unplugging console ports
hvc_remove() has some bug which freezes other active hvc ports when one
port is removed.
So disable calling of hvc_remove() which deregisters a port with the
hvc_console.
If the hvc_console code calls into our get_chars() routine as a result
of a poll operation, we will return -EPIPE and the hvc_console code will
then do the necessary cleanup.
This call will be restored when the bug in hvc_remove() is found and
fixed.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 6dc69f970231387d8fe646a831920da26408b5f5 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Return -EPIPE to hvc_console if we lost the connection
hvc_console handles -EPIPE properly when the connection to the host is
lost.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| eaeff9608a8cf43a676b6f4b6235ea9d76192230 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Let host know of port or device add failures
The host may want to know and let management apps notify of port or
device add failures. Send a control message saying the device or port is
not ready in this case.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3425e706bf6faa2965c4e99f39085f7367a8f4e2 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add a __send_control_msg() that can send messages without a valid port
We will introduce control messages that operate on the device as a whole
rather than just ports. Make send_control_msg() a wrapper around
__send_control_msg() which does not need a valid port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| b99fa815d71023b2e330d63cd7f47d6247ffa321 |
|
20-May-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: Revert "virtio: disable multiport console support."
This reverts commit b7a413015d2986edf020fba765c906cc9cbcbfc9.
Multiport support was disabled for 2.6.34 because we wanted to introduce
a new ABI and since we didn't have any released kernel with the older
ABI and were out of the merge window, it didn't make sense keeping the
older ABI around.
Now we revert the patch disabling multiport and rework the ABI in the
following patches.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 505b0451c47699ca63db70bd5ec3bba187ec4bfd |
|
12-Apr-2010 |
Michael S. Tsirkin <mst@redhat.com> |
virtio_console: use virtqueue_xxx wrappers
Switch virtio_console to new virtqueue_xxx wrappers.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| b7a413015d2986edf020fba765c906cc9cbcbfc9 |
|
31-Mar-2010 |
Michael S. Tsirkin <mst@redhat.com> |
virtio: disable multiport console support.
Move MULTIPORT feature and related config changes
out of exported headers, and disable the feature
at runtime.
At this point, it seems less risky to keep code around
until we can enable it than rip it out completely.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 9ff4cfab82d27e9fda72315f911bbaa9516e04bc |
|
08-Apr-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console makes incorrect assumption about virtio API
The get_buf() API sets the second arg to the number of bytes *written*
by the other side; in this case it should be zero as these are output buffers.
lguest gets this right (obviously kvm's console doesn't), resulting in
continual buildup of console writes.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Amit Shah <amit.shah@redhat.com>
|
| 162a689a13ed61c0752726edb75427b2cd4186c1 |
|
23-Mar-2010 |
François Diakhaté <fdiakh@gmail.com> |
virtio: console: Fix early_put_chars usage
Currently early_put_chars is not used by virtio_console because it can
only be used once a port has been found, at which point it's too late
because it is no longer needed. This patch should fix it.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 5a0e3ad6af8660be21ca98a971cd00f331318c05 |
|
24-Mar-2010 |
Tejun Heo <tj@kernel.org> |
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
|
| 2de16a493cc6153f7fa0b9da12a3862d063e3425 |
|
19-Mar-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Check if port is valid in resize_console
The console port could have been hot-unplugged. Check if it is valid
before working on it.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
| ec64213c4d482ee4d15b34511441eaecdd002adf |
|
19-Mar-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Generate a kobject CHANGE event on adding 'name' attribute
When the host lets us know what 'name' a port is assigned, we create the
sysfs 'name' attribute. Generate a 'change' event after this so that
udev wakes up and acts on the rules for virtio-ports (currently there's
only one rule that creates a symlink from the 'name' to the actual char
device).
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
| 335a64a5c21ed58de21c0130c90c7e647cdcf572 |
|
24-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Use better variable names for fill_queue operation
We want to keep track of the number of buffers added to a vq. Use
nr_added_bufs instead of 'ret'.
Also, the users of fill_queue() overloaded a local 'err' variable to
check the numbers of buffers allocated. Use nr_added_bufs instead of
err.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reported-by: Juan Quintela <quintela@redhat.com>
|
| 604b2ad7ccb11569d3b843bb1ce0fbe034e70769 |
|
24-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fix type of 'len' as unsigned int
We declare 'len' as int type but it should be 'unsigned int', as
get_buf() wants it to be.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reported-by: Juan Quintela <quintela@redhat.com>
|
| d6933561924d8022f5d986ce7c511a2646eeadce |
|
12-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Fill ports' entire in_vq with buffers
Instead of allocating just one buffer for a port's in_vq, fill
the entire in_vq with buffers so the host need not stall while
an application consumes the data and makes the buffer available
again for the host.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 22a29eacd2a17f22c8260a8106a4e36bae7fb6ea |
|
12-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Error out if we can't allocate buffers for control queue
With MULTIPORT support, the control queue is an integral part of the
functioning of the device. If we can't get any buffers allocated, the
host won't be able to relay important information and the device may not
function as intended.
Ensure 'probe' doesn't succeed until the control queue has at least one
buffer allocated for its ivq.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 7177876fea8306a6f49400d11f5913bf9b3b5e5f |
|
12-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add ability to remove module
Add the ability to remove the virtio_console module.
This aids debugging.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a9cdd4855738906043b8131cfe8055d6cde88ffe |
|
12-Feb-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Ensure no memleaks in case of unused buffers
If unused data exists in in_vq, ensure we flush that first and then
detach unused buffers, which will ensure all buffers from the in_vq are
removed.
Also ensure we free the buffers after detaching them.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 298add723aecd7af461319fe815d935ef2c40d78 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: show error message if hvc_alloc fails for console ports
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| d99393effd76571cf2c4a07cbb6e86d41855a8fa |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add debugfs files for each port to expose debug info
This is helpful in examining ports' state.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 1f7aa42d166cd104b0700d61efe2064178a3f6da |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add ability to hot-unplug ports
Remove port data; deregister from the hvc core if it's a console port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 7f5d810dac70214d00b2440787535b6c7a73b6b7 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Handle port hot-plug
If the 'nr_ports' variable in the config space is updated to a higher
value, that means new ports have been hotplugged.
Introduce a new workqueue to handle such updates and create new ports.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 88f251ac58b2460ed16ff619a020ad3ef365e607 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Remove cached data on port close
Remove any data that we might have in a port's inbuf when closing a port
or when any data is received when a port is closed.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 431edb8a8bca71008fefceadf53b9315ef7196ec |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Register with sysfs and create a 'name' attribute for ports
The host can set a name for ports so that they're easily discoverable
instead of going by the /dev/vportNpn naming. This attribute will be
placed in /sys/class/virtio-ports/vportNpn/name. udev scripts can then
create symlinks to the port using the name.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3c7969ccb569968a79fab3729075751bc8fc2f78 |
|
26-Nov-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Ensure only one process can have a port open at a time
Add a guest_connected field that ensures only one process
can have a port open at a time.
This also ensures we don't have a race when we later add support for
dropping buffers when closing the char dev and buffer caching is turned
off for the particular port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2030fa496d74b49220308eaccf656e2338019cfd |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add file operations to ports for open/read/write/poll
Allow guest userspace applications to open, read from, write to, poll
the ports via the char dev interface.
When a port gets opened, a notification is sent to the host via a
control message indicating a connection has been established. Similarly,
on closing of the port, a notification is sent indicating disconnection.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| fb08bd274df61967f40d49c4625fe6ed75a69ab5 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Associate each port with a char device
The char device will be used as an interface by applications on the
guest to communicate with apps on the host.
The devices created are placed in /dev/vportNpn where N is the
virtio-console device number and n is the port number for that device.
One dynamic major device number is allocated for each device and minor
numbers are allocated for the ports contained within that device.
The file operation for the char devs will be added in the following
commits.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| b766ceed5bbf04ae153389f5a15f53b9b6106a35 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Prepare for writing to userspace buffers
When ports get advertised as char devices, the buffers will come from
userspace. Equip the fill_readbuf function with the ability to write
to userspace buffers.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 17634ba25544d60af1968982929150efad755032 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Add a new MULTIPORT feature, support for generic ports
This commit adds a new feature, MULTIPORT. If the host supports this
feature as well, the config space has the number of ports defined for
that device. New ports are spawned according to this information.
The config space also has the maximum number of ports that can be
spawned for a particular device. This is useful in initializing the
appropriate number of virtqueues in advance, as ports might be
hot-plugged in later.
Using this feature, generic ports can be created which are not tied to
hvc consoles.
We also open up a private channel between the host and the guest via
which some "control" messages are exchanged for the ports, like whether
the port being spawned is a console port, resizing the console window,
etc.
Next commits will add support for hotplugging and presenting char
devices in /dev/ for bi-directional guest-host communication.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f997f00bf8c3ddf748d757105afa1a7dd5297208 |
|
21-Dec-2009 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Introduce a send_buf function for a common path for sending data to host
Adding support for generic ports that will write to userspace will need
some code changes.
Consolidate the write routine into send_buf() and put_chars() now just
calls into the new function.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 203baab8ba3195dd929473ba95b91c2b838833e6 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Introduce function to hand off data from host to readers
In preparation for serving data to userspace (generic ports) as well as
in-kernel users (hvc consoles), separate out the functionality common to
both in a 'fill_readbuf()' function.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 2658a79acf014deb0eaff2063f8f7a2b59f41285 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Separate out find_vqs operation into a different function
With support for multiple ports, each port will have its own input and
output vqs. Prepare the probe function for this change.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| cfa6d3792550c9eac51887181358954e6515da6b |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Separate out console init into a new function
Console ports could be hot-added. Also, with the new multiport support,
a port is identified as a console port only if the host sends a control
message.
Move the console port init into a separate function so it can be invoked
from other places.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 4f23c573c0dbebfd193cfb90b003d67929c58b31 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: Separate out console-specific data into a separate struct
Move out console-specific stuff into a separate struct from 'struct
port' as we need to maintain two lists: one for all the ports (which
includes consoles) and one only for consoles since the hvc callbacks
only give us the vtermno.
This makes console handling cleaner.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| cb06e3676b22013e9b759627e41656ddb07dee6d |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: ensure console size is updated on hvc open
When multiple console support is added, ensure each port's size gets
updated when a new one is opened via hvc.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 1c85bf35449196e74deb487961d2f90c98f7b7ff |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: struct ports for multiple ports per device.
Rather than assume a single port, add a 'struct ports_device' which
stores data related to all the ports for that device.
Currently, there's only one port and is hooked up with hvc, but that
will change.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| d8a02bd58ab6da4495a2d1af74d980c217e9abcf |
|
18-Jan-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: remove global var
Now we can use an allocation function to remove our global console variable.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 38edf58d73c28b082ec808aecdeb0ef2b92af049 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: don't assume a single console port.
Keep a list of all ports being used as a console, and provide a lock
and a lookup function. The hvc callbacks only give us a vterm number,
so we need to map this.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 73954488b1cc74cf46d6b94b8d3175f45496bd32 |
|
18-Jan-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: use vdev->priv to avoid accessing global var.
Part of removing our "one console" assumptions, use vdev->priv to point
to the port (currently == the global console).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a3cde44908429e52b2ec052ad5a70ef60e1f2d56 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: introduce a get_inbuf helper to fetch bufs from in_vq
This makes taking locks around the get_buf vq operation easier, as well
as complements the add_inbuf() operation.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| e27b519807e04d950802cb89f7b22933d8d2f837 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: ensure add_inbuf can work for multiple ports as well
add_inbuf() assumed one port and one inbuf per port. Remove that
assumption.
Also move the function so that put_chars and get_chars are together.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| fdb9a054554e1e435e927c9a47a999f026abd408 |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: encapsulate buffer information in a struct
Collect port buffer, used_len, offset fields into a single structure.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 21206ede8826fd9d2eb72e05b429f3ccb1bdaff5 |
|
18-Jan-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: port encapsulation
We are heading towards a multiple-"port" system, so as part of weaning off
globals we encapsulate the information into 'struct port'.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| f550804ab92e37a08d2622522a0f11252a2158ea |
|
18-Jan-2010 |
Amit Shah <amit.shah@redhat.com> |
virtio: console: We support only one device at a time
We support only one virtio_console device at a time. If multiple are
found, error out if one is already initialized.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 1dff399616a79b8ef5d61ad68f2ef1e1f590b465 |
|
27-Nov-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
hvc_console: make the ops pointer const.
This is nicer for modern R/O protection. And noone needs it non-const, so
constify the callers as well.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: linuxppc-dev@ozlabs.org
|
| 971f3390003619ea4ac0b20ee93dfd3209025790 |
|
18-Jan-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: statically initialize virtio_cons
That way, we can make it const as is good kernel style. We use a separate
indirection for the early console, rather than mugging ops.put_chars.
We rename it hv_ops, too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a23ea92474e558b071d3e43d961ec767c31faebd |
|
18-Jan-2010 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: console: comment cleanup
Remove old lguest-style comments.
[Amit: - wingify comments acc. to kernel style
- indent comments ]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| e95646c3ec33c8ec0693992da4332a6b32eb7e31 |
|
30-Sep-2009 |
Christian Borntraeger <borntraeger@de.ibm.com> |
virtio: let header files include virtio_ids.h
Rusty,
commit 3ca4f5ca73057a617f9444a91022d7127041970a
virtio: add virtio IDs file
moved all device IDs into a single file. While the change itself is
a very good one, it can break userspace applications. For example
if a userspace tool wanted to get the ID of virtio_net it used to
include virtio_net.h. This does no longer work, since virtio_net.h
does not include virtio_ids.h.
This patch moves all "#include <linux/virtio_ids.h>" from the C
files into the header files, making the header files compatible with
the old ones.
In addition, this patch exports virtio_ids.h to userspace.
CC: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3ca4f5ca73057a617f9444a91022d7127041970a |
|
31-Jul-2009 |
Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> |
virtio: add virtio IDs file
Virtio IDs are spread all over the tree which makes assigning new IDs
bothersome. Putting them together should make the process less error-prone.
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 3c1b27d5043086a485f8526353ae9fe37bfa1065 |
|
24-Sep-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: make add_buf return capacity remaining
This API change means that virtio_net can tell how much capacity
remains for buffers. It's necessarily fuzzy, since
VIRTIO_RING_F_INDIRECT_DESC means we can fit any number of descriptors
in one, *if* we can kmalloc.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Dinesh Subhraveti <dineshs@us.ibm.com>
|
| d2a7ddda9ffb1c8961abff6714b0f1eb925c120f |
|
13-Jun-2009 |
Michael S. Tsirkin <mst@redhat.com> |
virtio: find_vqs/del_vqs virtio operations
This replaces find_vq/del_vq with find_vqs/del_vqs virtio operations,
and updates all drivers. This is needed for MSI support, because MSI
needs to know the total number of vectors upfront.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (+ lguest/9p compile fixes)
|
| 9499f5e7ed5224c40706f0cec6542a9916bc7606 |
|
13-Jun-2009 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: add names to virtqueue struct, mapping from devices to queues.
Add a linked list of all virtqueues for a virtio device: this helps for
debugging and is also needed for upcoming interface change.
Also, add a "name" field for clearer debug messages.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| c29834584ea4eafccf2f62a0b8a32e64f792044c |
|
25-Nov-2008 |
Christian Borntraeger <borntraeger@de.ibm.com> |
virtio_console: support console resizing
this patch uses the new hvc callback hvc_resize to set the window size
which allows to change the tty size of hvc_console via a hvc_resize
function.
I have added a new feature bit VIRTIO_CONSOLE_F_SIZE. The driver will
change the window size on tty open and via the config_changed callback
of the transport. Currently lguest and kvm_s390 have not implemented this
callback, but the callback can be implemented at a later point in time.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| fc362e2e0efd8b652ebfb409a4e43e6189c04f6f |
|
14-Oct-2008 |
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
hvc_console: Add a hangup notifier for backends
I have added a hangup notifier that can be used by hvc console
backends to handle a tty hangup. The default irq hangup notifier
calls the notifier_del_irq() for compatibility.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
|
| 91fcad19d03ed67cb50fd0e1913a8b89cc3ed3ec |
|
20-Jun-2008 |
Christian Borntraeger <borntraeger@de.ibm.com> |
virtio_console: use virtqueue notification for hvc_console
This patch exploits the new notifier callbacks of the hvc_console. We can
use the virtio callbacks instead of the polling code.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| a586d4f6016f7139d8c26df0e6927131168d3b5b |
|
05-Feb-2008 |
Rusty Russell <rusty@rustcorp.com.au> |
virtio: simplify config mechanism.
Previously we used a type/len pair within the config space, but this
seems overkill. We now simply define a structure which represents the
layout in the config space: the config space can now only be extended
at the end.
The main driver-visible changes:
1) We indicate what fields are present with an explicit feature bit.
2) Virtqueues are explicitly numbered, and not in the config space.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|
| 139b82984af5a98e4b03fd01616d79fc4970128a |
|
05-Nov-2007 |
Randy Dunlap <randy.dunlap@oracle.com> |
virtio/virtcons: fix section mismatch warning
Make virtcons_probe() __devinit.
Fixes this section warning:
WARNING: vmlinux.o(.text+0x14c10b): Section mismatch: reference to .init.text:hvc_alloc (between 'virtcons_probe' and 'ac_register_board')
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
| 31610434bc3523c0b01a10917a1185096a03c4c8 |
|
22-Oct-2007 |
Rusty Russell <rusty@rustcorp.com.au> |
Virtio console driver
This is an hvc-based virtio console driver. It's suboptimal becuase
hvc expects to have raw access to interrupts and virtio doesn't assume
that, so it currently polls.
There are two solutions: expose hvc's "kick" interface, or wean off hvc.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
|