linux/drivers/input/misc/xen-kbdfront.c

573 lines
14 KiB
C
Raw Normal View History

/*
* Xen para-virtual input device
*
* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
* Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
*
* Based on linux/drivers/input/mouse/sermouse.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/input/mt.h>
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>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <xen/events.h>
#include <xen/page.h>
#include <xen/grant_table.h>
#include <xen/interface/grant_table.h>
#include <xen/interface/io/fbif.h>
#include <xen/interface/io/kbdif.h>
#include <xen/xenbus.h>
xen/pvhvm: If xen_platform_pci=0 is set don't blow up (v4). The user has the option of disabling the platform driver: 00:02.0 Unassigned class [ff80]: XenSource, Inc. Xen Platform Device (rev 01) which is used to unplug the emulated drivers (IDE, Realtek 8169, etc) and allow the PV drivers to take over. If the user wishes to disable that they can set: xen_platform_pci=0 (in the guest config file) or xen_emul_unplug=never (on the Linux command line) except it does not work properly. The PV drivers still try to load and since the Xen platform driver is not run - and it has not initialized the grant tables, most of the PV drivers stumble upon: input: Xen Virtual Keyboard as /devices/virtual/input/input5 input: Xen Virtual Pointer as /devices/virtual/input/input6M ------------[ cut here ]------------ kernel BUG at /home/konrad/ssd/konrad/linux/drivers/xen/grant-table.c:1206! invalid opcode: 0000 [#1] SMP Modules linked in: xen_kbdfront(+) xenfs xen_privcmd CPU: 6 PID: 1389 Comm: modprobe Not tainted 3.13.0-rc1upstream-00021-ga6c892b-dirty #1 Hardware name: Xen HVM domU, BIOS 4.4-unstable 11/26/2013 RIP: 0010:[<ffffffff813ddc40>] [<ffffffff813ddc40>] get_free_entries+0x2e0/0x300 Call Trace: [<ffffffff8150d9a3>] ? evdev_connect+0x1e3/0x240 [<ffffffff813ddd0e>] gnttab_grant_foreign_access+0x2e/0x70 [<ffffffffa0010081>] xenkbd_connect_backend+0x41/0x290 [xen_kbdfront] [<ffffffffa0010a12>] xenkbd_probe+0x2f2/0x324 [xen_kbdfront] [<ffffffff813e5757>] xenbus_dev_probe+0x77/0x130 [<ffffffff813e7217>] xenbus_frontend_dev_probe+0x47/0x50 [<ffffffff8145e9a9>] driver_probe_device+0x89/0x230 [<ffffffff8145ebeb>] __driver_attach+0x9b/0xa0 [<ffffffff8145eb50>] ? driver_probe_device+0x230/0x230 [<ffffffff8145eb50>] ? driver_probe_device+0x230/0x230 [<ffffffff8145cf1c>] bus_for_each_dev+0x8c/0xb0 [<ffffffff8145e7d9>] driver_attach+0x19/0x20 [<ffffffff8145e260>] bus_add_driver+0x1a0/0x220 [<ffffffff8145f1ff>] driver_register+0x5f/0xf0 [<ffffffff813e55c5>] xenbus_register_driver_common+0x15/0x20 [<ffffffff813e76b3>] xenbus_register_frontend+0x23/0x40 [<ffffffffa0015000>] ? 0xffffffffa0014fff [<ffffffffa001502b>] xenkbd_init+0x2b/0x1000 [xen_kbdfront] [<ffffffff81002049>] do_one_initcall+0x49/0x170 .. snip.. which is hardly nice. This patch fixes this by having each PV driver check for: - if running in PV, then it is fine to execute (as that is their native environment). - if running in HVM, check if user wanted 'xen_emul_unplug=never', in which case bail out and don't load any PV drivers. - if running in HVM, and if PCI device 5853:0001 (xen_platform_pci) does not exist, then bail out and not load PV drivers. - (v2) if running in HVM, and if the user wanted 'xen_emul_unplug=ide-disks', then bail out for all PV devices _except_ the block one. Ditto for the network one ('nics'). - (v2) if running in HVM, and if the user wanted 'xen_emul_unplug=unnecessary' then load block PV driver, and also setup the legacy IDE paths. In (v3) make it actually load PV drivers. Reported-by: Sander Eikelenboom <linux@eikelenboom.it Reported-by: Anthony PERARD <anthony.perard@citrix.com> Reported-and-Tested-by: Fabio Fantoni <fabio.fantoni@m2r.biz> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v2: Add extra logic to handle the myrid ways 'xen_emul_unplug' can be used per Ian and Stefano suggestion] [v3: Make the unnecessary case work properly] [v4: s/disks/ide-disks/ spotted by Fabio] Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> [for PCI parts] CC: stable@vger.kernel.org
2013-11-27 04:05:40 +08:00
#include <xen/platform_pci.h>
struct xenkbd_info {
struct input_dev *kbd;
struct input_dev *ptr;
struct input_dev *mtouch;
struct xenkbd_page *page;
int gref;
int irq;
struct xenbus_device *xbdev;
char phys[32];
/* current MT slot/contact ID we are injecting events in */
int mtouch_cur_contact_id;
};
enum { KPARAM_X, KPARAM_Y, KPARAM_CNT };
static int ptr_size[KPARAM_CNT] = { XENFB_WIDTH, XENFB_HEIGHT };
module_param_array(ptr_size, int, NULL, 0444);
MODULE_PARM_DESC(ptr_size,
"Pointing device width, height in pixels (default 800,600)");
static int xenkbd_remove(struct xenbus_device *);
static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
static void xenkbd_disconnect_backend(struct xenkbd_info *);
/*
* Note: if you need to send out events, see xenfb_do_update() for how
* to do that.
*/
static void xenkbd_handle_motion_event(struct xenkbd_info *info,
struct xenkbd_motion *motion)
{
if (unlikely(!info->ptr))
return;
input_report_rel(info->ptr, REL_X, motion->rel_x);
input_report_rel(info->ptr, REL_Y, motion->rel_y);
if (motion->rel_z)
input_report_rel(info->ptr, REL_WHEEL, -motion->rel_z);
input_sync(info->ptr);
}
static void xenkbd_handle_position_event(struct xenkbd_info *info,
struct xenkbd_position *pos)
{
if (unlikely(!info->ptr))
return;
input_report_abs(info->ptr, ABS_X, pos->abs_x);
input_report_abs(info->ptr, ABS_Y, pos->abs_y);
if (pos->rel_z)
input_report_rel(info->ptr, REL_WHEEL, -pos->rel_z);
input_sync(info->ptr);
}
static void xenkbd_handle_key_event(struct xenkbd_info *info,
struct xenkbd_key *key)
{
struct input_dev *dev;
int value = key->pressed;
if (test_bit(key->keycode, info->ptr->keybit)) {
dev = info->ptr;
} else if (test_bit(key->keycode, info->kbd->keybit)) {
dev = info->kbd;
if (key->pressed && test_bit(key->keycode, info->kbd->key))
value = 2; /* Mark as autorepeat */
} else {
pr_warn("unhandled keycode 0x%x\n", key->keycode);
return;
}
if (unlikely(!dev))
return;
input_event(dev, EV_KEY, key->keycode, value);
input_sync(dev);
}
static void xenkbd_handle_mt_event(struct xenkbd_info *info,
struct xenkbd_mtouch *mtouch)
{
if (unlikely(!info->mtouch))
return;
if (mtouch->contact_id != info->mtouch_cur_contact_id) {
info->mtouch_cur_contact_id = mtouch->contact_id;
input_mt_slot(info->mtouch, mtouch->contact_id);
}
switch (mtouch->event_type) {
case XENKBD_MT_EV_DOWN:
input_mt_report_slot_state(info->mtouch, MT_TOOL_FINGER, true);
/* fall through */
case XENKBD_MT_EV_MOTION:
input_report_abs(info->mtouch, ABS_MT_POSITION_X,
mtouch->u.pos.abs_x);
input_report_abs(info->mtouch, ABS_MT_POSITION_Y,
mtouch->u.pos.abs_y);
break;
case XENKBD_MT_EV_SHAPE:
input_report_abs(info->mtouch, ABS_MT_TOUCH_MAJOR,
mtouch->u.shape.major);
input_report_abs(info->mtouch, ABS_MT_TOUCH_MINOR,
mtouch->u.shape.minor);
break;
case XENKBD_MT_EV_ORIENT:
input_report_abs(info->mtouch, ABS_MT_ORIENTATION,
mtouch->u.orientation);
break;
case XENKBD_MT_EV_UP:
input_mt_report_slot_state(info->mtouch, MT_TOOL_FINGER, false);
break;
case XENKBD_MT_EV_SYN:
input_mt_sync_frame(info->mtouch);
input_sync(info->mtouch);
break;
}
}
static void xenkbd_handle_event(struct xenkbd_info *info,
union xenkbd_in_event *event)
{
switch (event->type) {
case XENKBD_TYPE_MOTION:
xenkbd_handle_motion_event(info, &event->motion);
break;
case XENKBD_TYPE_KEY:
xenkbd_handle_key_event(info, &event->key);
break;
case XENKBD_TYPE_POS:
xenkbd_handle_position_event(info, &event->pos);
break;
case XENKBD_TYPE_MTOUCH:
xenkbd_handle_mt_event(info, &event->mtouch);
break;
}
}
static irqreturn_t input_handler(int rq, void *dev_id)
{
struct xenkbd_info *info = dev_id;
struct xenkbd_page *page = info->page;
__u32 cons, prod;
prod = page->in_prod;
if (prod == page->in_cons)
return IRQ_HANDLED;
rmb(); /* ensure we see ring contents up to prod */
for (cons = page->in_cons; cons != prod; cons++)
xenkbd_handle_event(info, &XENKBD_IN_RING_REF(page, cons));
mb(); /* ensure we got ring contents */
page->in_cons = cons;
notify_remote_via_irq(info->irq);
return IRQ_HANDLED;
}
static int xenkbd_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int ret, i;
bool with_mtouch, with_kbd, with_ptr;
struct xenkbd_info *info;
struct input_dev *kbd, *ptr, *mtouch;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
return -ENOMEM;
}
dev_set_drvdata(&dev->dev, info);
info->xbdev = dev;
info->irq = -1;
info->gref = -1;
snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
if (!info->page)
goto error_nomem;
/*
* The below are reverse logic, e.g. if the feature is set, then
* do not expose the corresponding virtual device.
*/
with_kbd = !xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_FEAT_DSBL_KEYBRD, 0);
with_ptr = !xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_FEAT_DSBL_POINTER, 0);
/* Direct logic: if set, then create multi-touch device. */
with_mtouch = xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_FEAT_MTOUCH, 0);
if (with_mtouch) {
ret = xenbus_write(XBT_NIL, dev->nodename,
XENKBD_FIELD_REQ_MTOUCH, "1");
if (ret) {
pr_warn("xenkbd: can't request multi-touch");
with_mtouch = 0;
}
}
/* keyboard */
if (with_kbd) {
kbd = input_allocate_device();
if (!kbd)
goto error_nomem;
kbd->name = "Xen Virtual Keyboard";
kbd->phys = info->phys;
kbd->id.bustype = BUS_PCI;
kbd->id.vendor = 0x5853;
kbd->id.product = 0xffff;
__set_bit(EV_KEY, kbd->evbit);
for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
__set_bit(i, kbd->keybit);
for (i = KEY_OK; i < KEY_MAX; i++)
__set_bit(i, kbd->keybit);
ret = input_register_device(kbd);
if (ret) {
input_free_device(kbd);
xenbus_dev_fatal(dev, ret,
"input_register_device(kbd)");
goto error;
}
info->kbd = kbd;
}
/* pointing device */
if (with_ptr) {
unsigned int abs;
/* Set input abs params to match backend screen res */
abs = xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_FEAT_ABS_POINTER, 0);
ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_WIDTH,
ptr_size[KPARAM_X]);
ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
XENKBD_FIELD_HEIGHT,
ptr_size[KPARAM_Y]);
if (abs) {
ret = xenbus_write(XBT_NIL, dev->nodename,
XENKBD_FIELD_REQ_ABS_POINTER, "1");
if (ret) {
pr_warn("xenkbd: can't request abs-pointer\n");
abs = 0;
}
}
ptr = input_allocate_device();
if (!ptr)
goto error_nomem;
ptr->name = "Xen Virtual Pointer";
ptr->phys = info->phys;
ptr->id.bustype = BUS_PCI;
ptr->id.vendor = 0x5853;
ptr->id.product = 0xfffe;
if (abs) {
__set_bit(EV_ABS, ptr->evbit);
input_set_abs_params(ptr, ABS_X, 0,
ptr_size[KPARAM_X], 0, 0);
input_set_abs_params(ptr, ABS_Y, 0,
ptr_size[KPARAM_Y], 0, 0);
} else {
input_set_capability(ptr, EV_REL, REL_X);
input_set_capability(ptr, EV_REL, REL_Y);
}
input_set_capability(ptr, EV_REL, REL_WHEEL);
__set_bit(EV_KEY, ptr->evbit);
for (i = BTN_LEFT; i <= BTN_TASK; i++)
__set_bit(i, ptr->keybit);
ret = input_register_device(ptr);
if (ret) {
input_free_device(ptr);
xenbus_dev_fatal(dev, ret,
"input_register_device(ptr)");
goto error;
}
info->ptr = ptr;
}
/* multi-touch device */
if (with_mtouch) {
int num_cont, width, height;
mtouch = input_allocate_device();
if (!mtouch)
goto error_nomem;
num_cont = xenbus_read_unsigned(info->xbdev->otherend,
XENKBD_FIELD_MT_NUM_CONTACTS,
1);
width = xenbus_read_unsigned(info->xbdev->otherend,
XENKBD_FIELD_MT_WIDTH,
XENFB_WIDTH);
height = xenbus_read_unsigned(info->xbdev->otherend,
XENKBD_FIELD_MT_HEIGHT,
XENFB_HEIGHT);
mtouch->name = "Xen Virtual Multi-touch";
mtouch->phys = info->phys;
mtouch->id.bustype = BUS_PCI;
mtouch->id.vendor = 0x5853;
mtouch->id.product = 0xfffd;
input_set_abs_params(mtouch, ABS_MT_TOUCH_MAJOR,
0, 255, 0, 0);
input_set_abs_params(mtouch, ABS_MT_POSITION_X,
0, width, 0, 0);
input_set_abs_params(mtouch, ABS_MT_POSITION_Y,
0, height, 0, 0);
ret = input_mt_init_slots(mtouch, num_cont, INPUT_MT_DIRECT);
if (ret) {
input_free_device(mtouch);
xenbus_dev_fatal(info->xbdev, ret,
"input_mt_init_slots");
goto error;
}
ret = input_register_device(mtouch);
if (ret) {
input_free_device(mtouch);
xenbus_dev_fatal(info->xbdev, ret,
"input_register_device(mtouch)");
goto error;
}
info->mtouch_cur_contact_id = -1;
info->mtouch = mtouch;
}
if (!(with_kbd || with_ptr || with_mtouch)) {
ret = -ENXIO;
goto error;
}
ret = xenkbd_connect_backend(dev, info);
if (ret < 0)
goto error;
return 0;
error_nomem:
ret = -ENOMEM;
xenbus_dev_fatal(dev, ret, "allocating device memory");
error:
xenkbd_remove(dev);
return ret;
}
static int xenkbd_resume(struct xenbus_device *dev)
{
struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
xenkbd_disconnect_backend(info);
memset(info->page, 0, PAGE_SIZE);
return xenkbd_connect_backend(dev, info);
}
static int xenkbd_remove(struct xenbus_device *dev)
{
struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
xenkbd_disconnect_backend(info);
if (info->kbd)
input_unregister_device(info->kbd);
if (info->ptr)
input_unregister_device(info->ptr);
if (info->mtouch)
input_unregister_device(info->mtouch);
free_page((unsigned long)info->page);
kfree(info);
return 0;
}
static int xenkbd_connect_backend(struct xenbus_device *dev,
struct xenkbd_info *info)
{
int ret, evtchn;
struct xenbus_transaction xbt;
ret = gnttab_grant_foreign_access(dev->otherend_id,
virt_to_gfn(info->page), 0);
if (ret < 0)
return ret;
info->gref = ret;
ret = xenbus_alloc_evtchn(dev, &evtchn);
if (ret)
goto error_grant;
ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
0, dev->devicetype, info);
if (ret < 0) {
xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
goto error_evtchan;
}
info->irq = ret;
again:
ret = xenbus_transaction_start(&xbt);
if (ret) {
xenbus_dev_fatal(dev, ret, "starting transaction");
goto error_irqh;
}
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_REF, "%lu",
virt_to_gfn(info->page));
if (ret)
goto error_xenbus;
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_GREF,
"%u", info->gref);
if (ret)
goto error_xenbus;
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_EVT_CHANNEL, "%u",
evtchn);
if (ret)
goto error_xenbus;
ret = xenbus_transaction_end(xbt, 0);
if (ret) {
if (ret == -EAGAIN)
goto again;
xenbus_dev_fatal(dev, ret, "completing transaction");
goto error_irqh;
}
xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
error_xenbus:
xenbus_transaction_end(xbt, 1);
xenbus_dev_fatal(dev, ret, "writing xenstore");
error_irqh:
unbind_from_irqhandler(info->irq, info);
info->irq = -1;
error_evtchan:
xenbus_free_evtchn(dev, evtchn);
error_grant:
gnttab_end_foreign_access(info->gref, 0, 0UL);
info->gref = -1;
return ret;
}
static void xenkbd_disconnect_backend(struct xenkbd_info *info)
{
if (info->irq >= 0)
unbind_from_irqhandler(info->irq, info);
info->irq = -1;
if (info->gref >= 0)
gnttab_end_foreign_access(info->gref, 0, 0UL);
info->gref = -1;
}
static void xenkbd_backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
switch (backend_state) {
case XenbusStateInitialising:
case XenbusStateInitialised:
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
case XenbusStateUnknown:
break;
case XenbusStateInitWait:
xenbus_switch_state(dev, XenbusStateConnected);
break;
case XenbusStateConnected:
/*
* Work around xenbus race condition: If backend goes
* through InitWait to Connected fast enough, we can
* get Connected twice here.
*/
if (dev->state != XenbusStateConnected)
xenbus_switch_state(dev, XenbusStateConnected);
break;
case XenbusStateClosed:
if (dev->state == XenbusStateClosed)
break;
/* fall through - Missed the backend's CLOSING state */
case XenbusStateClosing:
xenbus_frontend_closed(dev);
break;
}
}
static const struct xenbus_device_id xenkbd_ids[] = {
{ XENKBD_DRIVER_NAME },
{ "" }
};
static struct xenbus_driver xenkbd_driver = {
.ids = xenkbd_ids,
.probe = xenkbd_probe,
.remove = xenkbd_remove,
.resume = xenkbd_resume,
.otherend_changed = xenkbd_backend_changed,
};
static int __init xenkbd_init(void)
{
if (!xen_domain())
return -ENODEV;
/* Nothing to do if running in dom0. */
if (xen_initial_domain())
return -ENODEV;
xen/pvhvm: If xen_platform_pci=0 is set don't blow up (v4). The user has the option of disabling the platform driver: 00:02.0 Unassigned class [ff80]: XenSource, Inc. Xen Platform Device (rev 01) which is used to unplug the emulated drivers (IDE, Realtek 8169, etc) and allow the PV drivers to take over. If the user wishes to disable that they can set: xen_platform_pci=0 (in the guest config file) or xen_emul_unplug=never (on the Linux command line) except it does not work properly. The PV drivers still try to load and since the Xen platform driver is not run - and it has not initialized the grant tables, most of the PV drivers stumble upon: input: Xen Virtual Keyboard as /devices/virtual/input/input5 input: Xen Virtual Pointer as /devices/virtual/input/input6M ------------[ cut here ]------------ kernel BUG at /home/konrad/ssd/konrad/linux/drivers/xen/grant-table.c:1206! invalid opcode: 0000 [#1] SMP Modules linked in: xen_kbdfront(+) xenfs xen_privcmd CPU: 6 PID: 1389 Comm: modprobe Not tainted 3.13.0-rc1upstream-00021-ga6c892b-dirty #1 Hardware name: Xen HVM domU, BIOS 4.4-unstable 11/26/2013 RIP: 0010:[<ffffffff813ddc40>] [<ffffffff813ddc40>] get_free_entries+0x2e0/0x300 Call Trace: [<ffffffff8150d9a3>] ? evdev_connect+0x1e3/0x240 [<ffffffff813ddd0e>] gnttab_grant_foreign_access+0x2e/0x70 [<ffffffffa0010081>] xenkbd_connect_backend+0x41/0x290 [xen_kbdfront] [<ffffffffa0010a12>] xenkbd_probe+0x2f2/0x324 [xen_kbdfront] [<ffffffff813e5757>] xenbus_dev_probe+0x77/0x130 [<ffffffff813e7217>] xenbus_frontend_dev_probe+0x47/0x50 [<ffffffff8145e9a9>] driver_probe_device+0x89/0x230 [<ffffffff8145ebeb>] __driver_attach+0x9b/0xa0 [<ffffffff8145eb50>] ? driver_probe_device+0x230/0x230 [<ffffffff8145eb50>] ? driver_probe_device+0x230/0x230 [<ffffffff8145cf1c>] bus_for_each_dev+0x8c/0xb0 [<ffffffff8145e7d9>] driver_attach+0x19/0x20 [<ffffffff8145e260>] bus_add_driver+0x1a0/0x220 [<ffffffff8145f1ff>] driver_register+0x5f/0xf0 [<ffffffff813e55c5>] xenbus_register_driver_common+0x15/0x20 [<ffffffff813e76b3>] xenbus_register_frontend+0x23/0x40 [<ffffffffa0015000>] ? 0xffffffffa0014fff [<ffffffffa001502b>] xenkbd_init+0x2b/0x1000 [xen_kbdfront] [<ffffffff81002049>] do_one_initcall+0x49/0x170 .. snip.. which is hardly nice. This patch fixes this by having each PV driver check for: - if running in PV, then it is fine to execute (as that is their native environment). - if running in HVM, check if user wanted 'xen_emul_unplug=never', in which case bail out and don't load any PV drivers. - if running in HVM, and if PCI device 5853:0001 (xen_platform_pci) does not exist, then bail out and not load PV drivers. - (v2) if running in HVM, and if the user wanted 'xen_emul_unplug=ide-disks', then bail out for all PV devices _except_ the block one. Ditto for the network one ('nics'). - (v2) if running in HVM, and if the user wanted 'xen_emul_unplug=unnecessary' then load block PV driver, and also setup the legacy IDE paths. In (v3) make it actually load PV drivers. Reported-by: Sander Eikelenboom <linux@eikelenboom.it Reported-by: Anthony PERARD <anthony.perard@citrix.com> Reported-and-Tested-by: Fabio Fantoni <fabio.fantoni@m2r.biz> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v2: Add extra logic to handle the myrid ways 'xen_emul_unplug' can be used per Ian and Stefano suggestion] [v3: Make the unnecessary case work properly] [v4: s/disks/ide-disks/ spotted by Fabio] Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> [for PCI parts] CC: stable@vger.kernel.org
2013-11-27 04:05:40 +08:00
if (!xen_has_pv_devices())
return -ENODEV;
return xenbus_register_frontend(&xenkbd_driver);
}
static void __exit xenkbd_cleanup(void)
{
xenbus_unregister_driver(&xenkbd_driver);
}
module_init(xenkbd_init);
module_exit(xenkbd_cleanup);
MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS("xen:" XENKBD_DRIVER_NAME);