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Some virtio internal cleanups, a new virtio device "virtio input", and

Browse source 
a change to allow the legacy virtio balloon.
 
 Most excitingly, some lguest work!  No seriously, I got some cleanup
 patches.
 
 Cheers,
 Rusty.
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Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull virtio updates from Rusty Russell:
 "Some virtio internal cleanups, a new virtio device "virtio input", and
  a change to allow the legacy virtio balloon.

  Most excitingly, some lguest work! No seriously, I got some cleanup
  patches"

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  virtio: drop virtio_device_is_legacy_only
  virtio_pci: support non-legacy balloon devices
  virtio_mmio: support non-legacy balloon devices
  virtio_ccw: support non-legacy balloon devices
  virtio: balloon might not be a legacy device
  virtio_balloon: transitional interface
  virtio_ring: Update weak barriers to use dma_wmb/rmb
  virtio_pci_modern: switch to type-safe io accessors
  virtio_pci_modern: type-safe io accessors
  lguest: handle traps on the "interrupt suppressed" iret instruction.
  virtio: drop a useless config read
  virtio_config: reorder functions
  Add virtio-input driver.
  lguest: suppress interrupts for single insn, not range.
  lguest: simplify lguest_iret
  lguest: rename i386_head.S in the comments
  lguest: explicitly set miscdevice's private_data NULL
  lguest: fix pending interrupt test.
This commit is contained in:
Linus Torvalds 2015-04-22 10:55:06 -07:00
commit b9bb6fb73b
24 changed files with 721 additions and 167 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
MAINTAINERS
View file

@ -10517,6 +10517,12 @@ S: Maintained
F: drivers/vhost/
F: include/uapi/linux/vhost.h
VIRTIO INPUT DRIVER
M: Gerd Hoffmann <kraxel@redhat.com>
S: Maintained
F: drivers/virtio/virtio_input.c
F: include/uapi/linux/virtio_input.h
VIA RHINE NETWORK DRIVER
M: Roger Luethi <rl@hellgate.ch>
S: Maintained

7
arch/x86/include/asm/lguest.h
View file

@ -20,13 +20,10 @@ extern unsigned long switcher_addr;
/* Found in switcher.S */
extern unsigned long default_idt_entries[];
/* Declarations for definitions in lguest_guest.S */
extern char lguest_noirq_start[], lguest_noirq_end[];
/* Declarations for definitions in arch/x86/lguest/head_32.S */
extern char lguest_noirq_iret[];
extern const char lgstart_cli[], lgend_cli[];
extern const char lgstart_sti[], lgend_sti[];
extern const char lgstart_popf[], lgend_popf[];
extern const char lgstart_pushf[], lgend_pushf[];
extern const char lgstart_iret[], lgend_iret[];
extern void lguest_iret(void);
extern void lguest_init(void);

7
arch/x86/lguest/boot.c
View file

@ -87,8 +87,7 @@
struct lguest_data lguest_data = {
.hcall_status = { [0 ... LHCALL_RING_SIZE-1] = 0xFF },
.noirq_start = (u32)lguest_noirq_start,
.noirq_end = (u32)lguest_noirq_end,
.noirq_iret = (u32)lguest_noirq_iret,
.kernel_address = PAGE_OFFSET,
.blocked_interrupts = { 1 }, /* Block timer interrupts */
.syscall_vec = SYSCALL_VECTOR,
@ -262,7 +261,7 @@ PV_CALLEE_SAVE_REGS_THUNK(lguest_save_fl);
PV_CALLEE_SAVE_REGS_THUNK(lguest_irq_disable);
/*:*/
/* These are in i386_head.S */
/* These are in head_32.S */
extern void lg_irq_enable(void);
extern void lg_restore_fl(unsigned long flags);
@ -1368,7 +1367,7 @@ static void lguest_restart(char *reason)
* fit comfortably.
*
* First we need assembly templates of each of the patchable Guest operations,
* and these are in i386_head.S.
* and these are in head_32.S.
*/
/*G:060 We construct a table from the assembler templates: */

30
arch/x86/lguest/head_32.S
View file

@ -84,7 +84,7 @@ ENTRY(lg_irq_enable)
* set lguest_data.irq_pending to X86_EFLAGS_IF. If it's not zero, we
* jump to send_interrupts, otherwise we're done.
*/
testl $0, lguest_data+LGUEST_DATA_irq_pending
cmpl $0, lguest_data+LGUEST_DATA_irq_pending
jnz send_interrupts
/*
* One cool thing about x86 is that you can do many things without using
@ -133,9 +133,8 @@ ENTRY(lg_restore_fl)
ret
/*:*/
/* These demark the EIP range where host should never deliver interrupts. */
.global lguest_noirq_start
.global lguest_noirq_end
/* These demark the EIP where host should never deliver interrupts. */
.global lguest_noirq_iret
/*M:004
* When the Host reflects a trap or injects an interrupt into the Guest, it
@ -168,29 +167,26 @@ ENTRY(lg_restore_fl)
* So we have to copy eflags from the stack to lguest_data.irq_enabled before
* we do the "iret".
*
* There are two problems with this: firstly, we need to use a register to do
* the copy and secondly, the whole thing needs to be atomic. The first
* problem is easy to solve: push %eax on the stack so we can use it, and then
* restore it at the end just before the real "iret".
* There are two problems with this: firstly, we can't clobber any registers
* and secondly, the whole thing needs to be atomic. The first problem
* is solved by using "push memory"/"pop memory" instruction pair for copying.
*
* The second is harder: copying eflags to lguest_data.irq_enabled will turn
* interrupts on before we're finished, so we could be interrupted before we
* return to userspace or wherever. Our solution to this is to surround the
* code with lguest_noirq_start: and lguest_noirq_end: labels. We tell the
* return to userspace or wherever. Our solution to this is to tell the
* Host that it is *never* to interrupt us there, even if interrupts seem to be
* enabled.
* enabled. (It's not necessary to protect pop instruction, since
* data gets updated only after it completes, so we only need to protect
* one instruction, iret).
*/
ENTRY(lguest_iret)
pushl %eax
movl 12(%esp), %eax
lguest_noirq_start:
pushl 2*4(%esp)
/*
* Note the %ss: segment prefix here. Normal data accesses use the
* "ds" segment, but that will have already been restored for whatever
* we're returning to (such as userspace): we can't trust it. The %ss:
* prefix makes sure we use the stack segment, which is still valid.
*/
movl %eax,%ss:lguest_data+LGUEST_DATA_irq_enabled
popl %eax
popl %ss:lguest_data+LGUEST_DATA_irq_enabled
lguest_noirq_iret:
iret
lguest_noirq_end:

5
drivers/lguest/hypercalls.c
View file

@ -211,10 +211,9 @@ static void initialize(struct lg_cpu *cpu)
/*
* The Guest tells us where we're not to deliver interrupts by putting
* the range of addresses into "struct lguest_data".
* the instruction address into "struct lguest_data".
*/
if (get_user(cpu->lg->noirq_start, &cpu->lg->lguest_data->noirq_start)
|| get_user(cpu->lg->noirq_end, &cpu->lg->lguest_data->noirq_end))
if (get_user(cpu->lg->noirq_iret, &cpu->lg->lguest_data->noirq_iret))
kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data);
/*

105
drivers/lguest/interrupts_and_traps.c
View file

@ -56,21 +56,16 @@ static void push_guest_stack(struct lg_cpu *cpu, unsigned long *gstack, u32 val)
}
/*H:210
* The set_guest_interrupt() routine actually delivers the interrupt or
* trap. The mechanics of delivering traps and interrupts to the Guest are the
* same, except some traps have an "error code" which gets pushed onto the
* stack as well: the caller tells us if this is one.
*
* "lo" and "hi" are the two parts of the Interrupt Descriptor Table for this
* interrupt or trap. It's split into two parts for traditional reasons: gcc
* on i386 used to be frightened by 64 bit numbers.
* The push_guest_interrupt_stack() routine saves Guest state on the stack for
* an interrupt or trap. The mechanics of delivering traps and interrupts to
* the Guest are the same, except some traps have an "error code" which gets
* pushed onto the stack as well: the caller tells us if this is one.
*
* We set up the stack just like the CPU does for a real interrupt, so it's
* identical for the Guest (and the standard "iret" instruction will undo
* it).
*/
static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi,
bool has_err)
static void push_guest_interrupt_stack(struct lg_cpu *cpu, bool has_err)
{
unsigned long gstack, origstack;
u32 eflags, ss, irq_enable;
@ -130,12 +125,28 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi,
if (has_err)
push_guest_stack(cpu, &gstack, cpu->regs->errcode);
/*
* Now we've pushed all the old state, we change the stack, the code
* segment and the address to execute.
*/
/* Adjust the stack pointer and stack segment. */
cpu->regs->ss = ss;
cpu->regs->esp = virtstack + (gstack - origstack);
}
/*
* This actually makes the Guest start executing the given interrupt/trap
* handler.
*
* "lo" and "hi" are the two parts of the Interrupt Descriptor Table for this
* interrupt or trap. It's split into two parts for traditional reasons: gcc
* on i386 used to be frightened by 64 bit numbers.
*/
static void guest_run_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi)
{
/* If we're already in the kernel, we don't change stacks. */
if ((cpu->regs->ss&0x3) != GUEST_PL)
cpu->regs->ss = cpu->esp1;
/*
* Set the code segment and the address to execute.
*/
cpu->regs->cs = (__KERNEL_CS|GUEST_PL);
cpu->regs->eip = idt_address(lo, hi);
@ -158,6 +169,24 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi,
kill_guest(cpu, "Disabling interrupts");
}
/* This restores the eflags word which was pushed on the stack by a trap */
static void restore_eflags(struct lg_cpu *cpu)
{
/* This is the physical address of the stack. */
unsigned long stack_pa = guest_pa(cpu, cpu->regs->esp);
/*
* Stack looks like this:
* Address Contents
* esp EIP
* esp + 4 CS
* esp + 8 EFLAGS
*/
cpu->regs->eflags = lgread(cpu, stack_pa + 8, u32);
cpu->regs->eflags &=
~(X86_EFLAGS_TF|X86_EFLAGS_VM|X86_EFLAGS_RF|X86_EFLAGS_NT);
}
/*H:205
* Virtual Interrupts.
*
@ -200,14 +229,6 @@ void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more)
BUG_ON(irq >= LGUEST_IRQS);
/*
* They may be in the middle of an iret, where they asked us never to
* deliver interrupts.
*/
if (cpu->regs->eip >= cpu->lg->noirq_start &&
(cpu->regs->eip < cpu->lg->noirq_end))
return;
/* If they're halted, interrupts restart them. */
if (cpu->halted) {
/* Re-enable interrupts. */
@ -237,12 +258,34 @@ void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more)
if (idt_present(idt->a, idt->b)) {
/* OK, mark it no longer pending and deliver it. */
clear_bit(irq, cpu->irqs_pending);
/*
* set_guest_interrupt() takes the interrupt descriptor and a
* flag to say whether this interrupt pushes an error code onto
* the stack as well: virtual interrupts never do.
* They may be about to iret, where they asked us never to
* deliver interrupts. In this case, we can emulate that iret
* then immediately deliver the interrupt. This is basically
* a noop: the iret would pop the interrupt frame and restore
* eflags, and then we'd set it up again. So just restore the
* eflags word and jump straight to the handler in this case.
*
* Denys Vlasenko points out that this isn't quite right: if
* the iret was returning to userspace, then that interrupt
* would reset the stack pointer (which the Guest told us
* about via LHCALL_SET_STACK). But unless the Guest is being
* *really* weird, that will be the same as the current stack
* anyway.
*/
set_guest_interrupt(cpu, idt->a, idt->b, false);
if (cpu->regs->eip == cpu->lg->noirq_iret) {
restore_eflags(cpu);
} else {
/*
* set_guest_interrupt() takes a flag to say whether
* this interrupt pushes an error code onto the stack
* as well: virtual interrupts never do.
*/
push_guest_interrupt_stack(cpu, false);
}
/* Actually make Guest cpu jump to handler. */
guest_run_interrupt(cpu, idt->a, idt->b);
}
/*
@ -353,8 +396,9 @@ bool deliver_trap(struct lg_cpu *cpu, unsigned int num)
*/
if (!idt_present(cpu->arch.idt[num].a, cpu->arch.idt[num].b))
return false;
set_guest_interrupt(cpu, cpu->arch.idt[num].a,
cpu->arch.idt[num].b, has_err(num));
push_guest_interrupt_stack(cpu, has_err(num));
guest_run_interrupt(cpu, cpu->arch.idt[num].a,
cpu->arch.idt[num].b);
return true;
}
@ -395,8 +439,9 @@ static bool direct_trap(unsigned int num)
* The Guest has the ability to turn its interrupt gates into trap gates,
* if it is careful. The Host will let trap gates can go directly to the
* Guest, but the Guest needs the interrupts atomically disabled for an
* interrupt gate. It can do this by pointing the trap gate at instructions
* within noirq_start and noirq_end, where it can safely disable interrupts.
* interrupt gate. The Host could provide a mechanism to register more
* "no-interrupt" regions, and the Guest could point the trap gate at
* instructions within that region, where it can safely disable interrupts.
*/
/*M:006

2
drivers/lguest/lg.h
View file

@ -102,7 +102,7 @@ struct lguest {
struct pgdir pgdirs[4];
unsigned long noirq_start, noirq_end;
unsigned long noirq_iret;
unsigned int stack_pages;
u32 tsc_khz;

8
drivers/lguest/lguest_user.c
View file

@ -339,6 +339,13 @@ static ssize_t write(struct file *file, const char __user *in,
}
}
static int open(struct inode *inode, struct file *file)
{
file->private_data = NULL;
return 0;
}
/*L:060
* The final piece of interface code is the close() routine. It reverses
* everything done in initialize(). This is usually called because the
@ -409,6 +416,7 @@ static int close(struct inode *inode, struct file *file)
*/
static const struct file_operations lguest_fops = {
.owner = THIS_MODULE,
.open = open,
.release = close,
.write = write,
.read = read,

10
drivers/s390/kvm/virtio_ccw.c
View file

@ -1201,13 +1201,9 @@ static int virtio_ccw_online(struct ccw_device *cdev)
vcdev->vdev.id.vendor = cdev->id.cu_type;
vcdev->vdev.id.device = cdev->id.cu_model;
if (virtio_device_is_legacy_only(vcdev->vdev.id)) {
vcdev->revision = 0;
} else {
ret = virtio_ccw_set_transport_rev(vcdev);
if (ret)
goto out_free;
}
ret = virtio_ccw_set_transport_rev(vcdev);
if (ret)
goto out_free;
ret = register_virtio_device(&vcdev->vdev);
if (ret) {

10
drivers/virtio/Kconfig
View file

@ -48,6 +48,16 @@ config VIRTIO_BALLOON
If unsure, say M.
config VIRTIO_INPUT
tristate "Virtio input driver"
depends on VIRTIO
depends on INPUT
---help---
This driver supports virtio input devices such as
keyboards, mice and tablets.
If unsure, say M.
config VIRTIO_MMIO
tristate "Platform bus driver for memory mapped virtio devices"
depends on HAS_IOMEM

1
drivers/virtio/Makefile
View file

@ -4,3 +4,4 @@ obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o
obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o

6
drivers/virtio/virtio.c
View file

@ -278,12 +278,6 @@ static struct bus_type virtio_bus = {
.remove = virtio_dev_remove,
};
bool virtio_device_is_legacy_only(struct virtio_device_id id)
{
return id.device == VIRTIO_ID_BALLOON;
}
EXPORT_SYMBOL_GPL(virtio_device_is_legacy_only);
int register_virtio_driver(struct virtio_driver *driver)
{
/* Catch this early. */

21
drivers/virtio/virtio_balloon.c
View file

@ -214,8 +214,8 @@ static inline void update_stat(struct virtio_balloon *vb, int idx,
u16 tag, u64 val)
{
BUG_ON(idx >= VIRTIO_BALLOON_S_NR);
vb->stats[idx].tag = tag;
vb->stats[idx].val = val;
vb->stats[idx].tag = cpu_to_virtio16(vb->vdev, tag);
vb->stats[idx].val = cpu_to_virtio64(vb->vdev, val);
}
#define pages_to_bytes(x) ((u64)(x) << PAGE_SHIFT)
@ -283,18 +283,27 @@ static void virtballoon_changed(struct virtio_device *vdev)
static inline s64 towards_target(struct virtio_balloon *vb)
{
__le32 v;
s64 target;
u32 num_pages;
virtio_cread(vb->vdev, struct virtio_balloon_config, num_pages, &v);
virtio_cread(vb->vdev, struct virtio_balloon_config, num_pages,
&num_pages);
target = le32_to_cpu(v);
/* Legacy balloon config space is LE, unlike all other devices. */
if (!virtio_has_feature(vb->vdev, VIRTIO_F_VERSION_1))
num_pages = le32_to_cpu((__force __le32)num_pages);
target = num_pages;
return target - vb->num_pages;
}
static void update_balloon_size(struct virtio_balloon *vb)
{
__le32 actual = cpu_to_le32(vb->num_pages);
u32 actual = vb->num_pages;
/* Legacy balloon config space is LE, unlike all other devices. */
if (!virtio_has_feature(vb->vdev, VIRTIO_F_VERSION_1))
actual = (__force u32)cpu_to_le32(actual);
virtio_cwrite(vb->vdev, struct virtio_balloon_config, actual,
&actual);

384
drivers/virtio/virtio_input.c Normal file
View file

@ -0,0 +1,384 @@
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/input.h>
#include <uapi/linux/virtio_ids.h>
#include <uapi/linux/virtio_input.h>
struct virtio_input {
struct virtio_device *vdev;
struct input_dev *idev;
char name[64];
char serial[64];
char phys[64];
struct virtqueue *evt, *sts;
struct virtio_input_event evts[64];
spinlock_t lock;
bool ready;
};
static void virtinput_queue_evtbuf(struct virtio_input *vi,
struct virtio_input_event *evtbuf)
{
struct scatterlist sg[1];
sg_init_one(sg, evtbuf, sizeof(*evtbuf));
virtqueue_add_inbuf(vi->evt, sg, 1, evtbuf, GFP_ATOMIC);
}
static void virtinput_recv_events(struct virtqueue *vq)
{
struct virtio_input *vi = vq->vdev->priv;
struct virtio_input_event *event;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vi->lock, flags);
if (vi->ready) {
while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
spin_unlock_irqrestore(&vi->lock, flags);
input_event(vi->idev,
le16_to_cpu(event->type),
le16_to_cpu(event->code),
le32_to_cpu(event->value));
spin_lock_irqsave(&vi->lock, flags);
virtinput_queue_evtbuf(vi, event);
}
virtqueue_kick(vq);
}
spin_unlock_irqrestore(&vi->lock, flags);
}
/*
* On error we are losing the status update, which isn't critical as
* this is typically used for stuff like keyboard leds.
*/
static int virtinput_send_status(struct virtio_input *vi,
u16 type, u16 code, s32 value)
{
struct virtio_input_event *stsbuf;
struct scatterlist sg[1];
unsigned long flags;
int rc;
stsbuf = kzalloc(sizeof(*stsbuf), GFP_ATOMIC);
if (!stsbuf)
return -ENOMEM;
stsbuf->type = cpu_to_le16(type);
stsbuf->code = cpu_to_le16(code);
stsbuf->value = cpu_to_le32(value);
sg_init_one(sg, stsbuf, sizeof(*stsbuf));
spin_lock_irqsave(&vi->lock, flags);
if (vi->ready) {
rc = virtqueue_add_outbuf(vi->sts, sg, 1, stsbuf, GFP_ATOMIC);
virtqueue_kick(vi->sts);
} else {
rc = -ENODEV;
}
spin_unlock_irqrestore(&vi->lock, flags);
if (rc != 0)
kfree(stsbuf);
return rc;
}
static void virtinput_recv_status(struct virtqueue *vq)
{
struct virtio_input *vi = vq->vdev->priv;
struct virtio_input_event *stsbuf;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vi->lock, flags);
while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
kfree(stsbuf);
spin_unlock_irqrestore(&vi->lock, flags);
}
static int virtinput_status(struct input_dev *idev, unsigned int type,
unsigned int code, int value)
{
struct virtio_input *vi = input_get_drvdata(idev);
return virtinput_send_status(vi, type, code, value);
}
static u8 virtinput_cfg_select(struct virtio_input *vi,
u8 select, u8 subsel)
{
u8 size;
virtio_cwrite(vi->vdev, struct virtio_input_config, select, &select);
virtio_cwrite(vi->vdev, struct virtio_input_config, subsel, &subsel);
virtio_cread(vi->vdev, struct virtio_input_config, size, &size);
return size;
}
static void virtinput_cfg_bits(struct virtio_input *vi, int select, int subsel,
unsigned long *bits, unsigned int bitcount)
{
unsigned int bit;
u8 *virtio_bits;
u8 bytes;
bytes = virtinput_cfg_select(vi, select, subsel);
if (!bytes)
return;
if (bitcount > bytes * 8)
bitcount = bytes * 8;
/*
* Bitmap in virtio config space is a simple stream of bytes,
* with the first byte carrying bits 0-7, second bits 8-15 and
* so on.
*/
virtio_bits = kzalloc(bytes, GFP_KERNEL);
if (!virtio_bits)
return;
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
u.bitmap),
virtio_bits, bytes);
for (bit = 0; bit < bitcount; bit++) {
if (virtio_bits[bit / 8] & (1 << (bit % 8)))
__set_bit(bit, bits);
}
kfree(virtio_bits);
if (select == VIRTIO_INPUT_CFG_EV_BITS)
__set_bit(subsel, vi->idev->evbit);
}
static void virtinput_cfg_abs(struct virtio_input *vi, int abs)
{
u32 mi, ma, re, fu, fl;
virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ABS_INFO, abs);
virtio_cread(vi->vdev, struct virtio_input_config, u.abs.min, &mi);
virtio_cread(vi->vdev, struct virtio_input_config, u.abs.max, &ma);
virtio_cread(vi->vdev, struct virtio_input_config, u.abs.res, &re);
virtio_cread(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu);
virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl);
input_set_abs_params(vi->idev, abs, mi, ma, fu, fl);
input_abs_set_res(vi->idev, abs, re);
}
static int virtinput_init_vqs(struct virtio_input *vi)
{
struct virtqueue *vqs[2];
vq_callback_t *cbs[] = { virtinput_recv_events,
virtinput_recv_status };
static const char *names[] = { "events", "status" };
int err;
err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names);
if (err)
return err;
vi->evt = vqs[0];
vi->sts = vqs[1];
return 0;
}
static void virtinput_fill_evt(struct virtio_input *vi)
{
unsigned long flags;
int i, size;
spin_lock_irqsave(&vi->lock, flags);
size = virtqueue_get_vring_size(vi->evt);
if (size > ARRAY_SIZE(vi->evts))
size = ARRAY_SIZE(vi->evts);
for (i = 0; i < size; i++)
virtinput_queue_evtbuf(vi, &vi->evts[i]);
virtqueue_kick(vi->evt);
spin_unlock_irqrestore(&vi->lock, flags);
}
static int virtinput_probe(struct virtio_device *vdev)
{
struct virtio_input *vi;
unsigned long flags;
size_t size;
int abs, err;
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
return -ENODEV;
vi = kzalloc(sizeof(*vi), GFP_KERNEL);
if (!vi)
return -ENOMEM;
vdev->priv = vi;
vi->vdev = vdev;
spin_lock_init(&vi->lock);
err = virtinput_init_vqs(vi);
if (err)
goto err_init_vq;
vi->idev = input_allocate_device();
if (!vi->idev) {
err = -ENOMEM;
goto err_input_alloc;
}
input_set_drvdata(vi->idev, vi);
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_NAME, 0);
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
u.string),
vi->name, min(size, sizeof(vi->name)));
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_SERIAL, 0);
virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
u.string),
vi->serial, min(size, sizeof(vi->serial)));
snprintf(vi->phys, sizeof(vi->phys),
"virtio%d/input0", vdev->index);
vi->idev->name = vi->name;
vi->idev->phys = vi->phys;
vi->idev->uniq = vi->serial;
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0);
if (size >= sizeof(struct virtio_input_devids)) {
virtio_cread(vi->vdev, struct virtio_input_config,
u.ids.bustype, &vi->idev->id.bustype);
virtio_cread(vi->vdev, struct virtio_input_config,
u.ids.vendor, &vi->idev->id.vendor);
virtio_cread(vi->vdev, struct virtio_input_config,
u.ids.product, &vi->idev->id.product);
virtio_cread(vi->vdev, struct virtio_input_config,
u.ids.version, &vi->idev->id.version);
} else {
vi->idev->id.bustype = BUS_VIRTUAL;
}
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_PROP_BITS, 0,
vi->idev->propbit, INPUT_PROP_CNT);
size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REP);
if (size)
__set_bit(EV_REP, vi->idev->evbit);
vi->idev->dev.parent = &vdev->dev;
vi->idev->event = virtinput_status;
/* device -> kernel */
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_KEY,
vi->idev->keybit, KEY_CNT);
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REL,
vi->idev->relbit, REL_CNT);
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_ABS,
vi->idev->absbit, ABS_CNT);
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_MSC,
vi->idev->mscbit, MSC_CNT);
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SW,
vi->idev->swbit, SW_CNT);
/* kernel -> device */
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_LED,
vi->idev->ledbit, LED_CNT);
virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SND,
vi->idev->sndbit, SND_CNT);
if (test_bit(EV_ABS, vi->idev->evbit)) {
for (abs = 0; abs < ABS_CNT; abs++) {
if (!test_bit(abs, vi->idev->absbit))
continue;
virtinput_cfg_abs(vi, abs);
}
}
virtio_device_ready(vdev);
vi->ready = true;
err = input_register_device(vi->idev);
if (err)
goto err_input_register;
virtinput_fill_evt(vi);
return 0;
err_input_register:
spin_lock_irqsave(&vi->lock, flags);
vi->ready = false;
spin_unlock_irqrestore(&vi->lock, flags);
input_free_device(vi->idev);
err_input_alloc:
vdev->config->del_vqs(vdev);
err_init_vq:
kfree(vi);
return err;
}
static void virtinput_remove(struct virtio_device *vdev)
{
struct virtio_input *vi = vdev->priv;
unsigned long flags;
spin_lock_irqsave(&vi->lock, flags);
vi->ready = false;
spin_unlock_irqrestore(&vi->lock, flags);
input_unregister_device(vi->idev);
vdev->config->del_vqs(vdev);
kfree(vi);
}
#ifdef CONFIG_PM_SLEEP
static int virtinput_freeze(struct virtio_device *vdev)
{
struct virtio_input *vi = vdev->priv;
unsigned long flags;
spin_lock_irqsave(&vi->lock, flags);
vi->ready = false;
spin_unlock_irqrestore(&vi->lock, flags);
vdev->config->del_vqs(vdev);
return 0;
}
static int virtinput_restore(struct virtio_device *vdev)
{
struct virtio_input *vi = vdev->priv;
int err;
err = virtinput_init_vqs(vi);
if (err)
return err;
virtio_device_ready(vdev);
vi->ready = true;
virtinput_fill_evt(vi);
return 0;
}
#endif
static unsigned int features[] = {
/* none */
};
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_INPUT, VIRTIO_DEV_ANY_ID },
{ 0 },
};
static struct virtio_driver virtio_input_driver = {
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.feature_table = features,
.feature_table_size = ARRAY_SIZE(features),
.id_table = id_table,
.probe = virtinput_probe,
.remove = virtinput_remove,
#ifdef CONFIG_PM_SLEEP
.freeze = virtinput_freeze,
.restore = virtinput_restore,
#endif
};
module_virtio_driver(virtio_input_driver);
MODULE_DEVICE_TABLE(virtio, id_table);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Virtio input device driver");
MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");

8
drivers/virtio/virtio_mmio.c
View file

@ -581,14 +581,6 @@ static int virtio_mmio_probe(struct platform_device *pdev)
}
vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID);
/* Reject legacy-only IDs for version 2 devices */
if (vm_dev->version == 2 &&
virtio_device_is_legacy_only(vm_dev->vdev.id)) {
dev_err(&pdev->dev, "Version 2 not supported for devices %u!\n",
vm_dev->vdev.id.device);
return -ENODEV;
}
if (vm_dev->version == 1)
writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE);

123
drivers/virtio/virtio_pci_modern.c
View file

@ -20,6 +20,50 @@
#define VIRTIO_PCI_NO_LEGACY
#include "virtio_pci_common.h"
/*
* Type-safe wrappers for io accesses.
* Use these to enforce at compile time the following spec requirement:
*
* The driver MUST access each field using the “natural” access
* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
* for 16-bit fields and 8-bit accesses for 8-bit fields.
*/
static inline u8 vp_ioread8(u8 __iomem *addr)
{
return ioread8(addr);
}
static inline u16 vp_ioread16 (u16 __iomem *addr)
{
return ioread16(addr);
}
static inline u32 vp_ioread32(u32 __iomem *addr)
{
return ioread32(addr);
}
static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
{
iowrite8(value, addr);
}
static inline void vp_iowrite16(u16 value, u16 __iomem *addr)
{
iowrite16(value, addr);
}
static inline void vp_iowrite32(u32 value, u32 __iomem *addr)
{
iowrite32(value, addr);
}
static void vp_iowrite64_twopart(u64 val,
__le32 __iomem *lo, __le32 __iomem *hi)
{
vp_iowrite32((u32)val, lo);
vp_iowrite32(val >> 32, hi);
}
static void __iomem *map_capability(struct pci_dev *dev, int off,
size_t minlen,
u32 align,
@ -94,22 +138,16 @@ static void __iomem *map_capability(struct pci_dev *dev, int off,
return p;
}
static void iowrite64_twopart(u64 val, __le32 __iomem *lo, __le32 __iomem *hi)
{
iowrite32((u32)val, lo);
iowrite32(val >> 32, hi);
}
/* virtio config->get_features() implementation */
static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u64 features;
iowrite32(0, &vp_dev->common->device_feature_select);
features = ioread32(&vp_dev->common->device_feature);
iowrite32(1, &vp_dev->common->device_feature_select);
features |= ((u64)ioread32(&vp_dev->common->device_feature) << 32);
vp_iowrite32(0, &vp_dev->common->device_feature_select);
features = vp_ioread32(&vp_dev->common->device_feature);
vp_iowrite32(1, &vp_dev->common->device_feature_select);
features |= ((u64)vp_ioread32(&vp_dev->common->device_feature) << 32);
return features;
}
@ -128,10 +166,10 @@ static int vp_finalize_features(struct virtio_device *vdev)
return -EINVAL;
}
iowrite32(0, &vp_dev->common->guest_feature_select);
iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
iowrite32(1, &vp_dev->common->guest_feature_select);
iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
vp_iowrite32(0, &vp_dev->common->guest_feature_select);
vp_iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
vp_iowrite32(1, &vp_dev->common->guest_feature_select);
vp_iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
return 0;
}
@ -210,14 +248,14 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
static u32 vp_generation(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(&vp_dev->common->config_generation);
return vp_ioread8(&vp_dev->common->config_generation);
}
/* config->{get,set}_status() implementations */
static u8 vp_get_status(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(&vp_dev->common->device_status);
return vp_ioread8(&vp_dev->common->device_status);
}
static void vp_set_status(struct virtio_device *vdev, u8 status)
@ -225,17 +263,17 @@ static void vp_set_status(struct virtio_device *vdev, u8 status)
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* We should never be setting status to 0. */
BUG_ON(status == 0);
iowrite8(status, &vp_dev->common->device_status);
vp_iowrite8(status, &vp_dev->common->device_status);
}
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* 0 status means a reset. */
iowrite8(0, &vp_dev->common->device_status);
vp_iowrite8(0, &vp_dev->common->device_status);
/* Flush out the status write, and flush in device writes,
* including MSI-X interrupts, if any. */
ioread8(&vp_dev->common->device_status);
vp_ioread8(&vp_dev->common->device_status);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
}
@ -243,10 +281,10 @@ static void vp_reset(struct virtio_device *vdev)
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
/* Setup the vector used for configuration events */
iowrite16(vector, &vp_dev->common->msix_config);
vp_iowrite16(vector, &vp_dev->common->msix_config);
/* Verify we had enough resources to assign the vector */
/* Will also flush the write out to device */
return ioread16(&vp_dev->common->msix_config);
return vp_ioread16(&vp_dev->common->msix_config);
}
static size_t vring_pci_size(u16 num)
@ -286,15 +324,15 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
u16 num, off;
int err;
if (index >= ioread16(&cfg->num_queues))
if (index >= vp_ioread16(&cfg->num_queues))
return ERR_PTR(-ENOENT);
/* Select the queue we're interested in */
iowrite16(index, &cfg->queue_select);
vp_iowrite16(index, &cfg->queue_select);
/* Check if queue is either not available or already active. */
num = ioread16(&cfg->queue_size);
if (!num || ioread16(&cfg->queue_enable))
num = vp_ioread16(&cfg->queue_size);
if (!num || vp_ioread16(&cfg->queue_enable))
return ERR_PTR(-ENOENT);
if (num & (num - 1)) {
@ -303,7 +341,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
/* get offset of notification word for this vq */
off = ioread16(&cfg->queue_notify_off);
off = vp_ioread16(&cfg->queue_notify_off);
info->num = num;
info->msix_vector = msix_vec;
@ -322,13 +360,13 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
/* activate the queue */
iowrite16(num, &cfg->queue_size);
iowrite64_twopart(virt_to_phys(info->queue),
&cfg->queue_desc_lo, &cfg->queue_desc_hi);
iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)),
&cfg->queue_avail_lo, &cfg->queue_avail_hi);
iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)),
&cfg->queue_used_lo, &cfg->queue_used_hi);
vp_iowrite16(num, &cfg->queue_size);
vp_iowrite64_twopart(virt_to_phys(info->queue),
&cfg->queue_desc_lo, &cfg->queue_desc_hi);
vp_iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)),
&cfg->queue_avail_lo, &cfg->queue_avail_hi);
vp_iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)),
&cfg->queue_used_lo, &cfg->queue_used_hi);
if (vp_dev->notify_base) {
/* offset should not wrap */
@ -357,8 +395,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
iowrite16(msix_vec, &cfg->queue_msix_vector);
msix_vec = ioread16(&cfg->queue_msix_vector);
vp_iowrite16(msix_vec, &cfg->queue_msix_vector);
msix_vec = vp_ioread16(&cfg->queue_msix_vector);
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto err_assign_vector;
@ -393,8 +431,8 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
* this, there's no way to go back except reset.
*/
list_for_each_entry(vq, &vdev->vqs, list) {
iowrite16(vq->index, &vp_dev->common->queue_select);
iowrite16(1, &vp_dev->common->queue_enable);
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(1, &vp_dev->common->queue_enable);
}
return 0;
@ -405,13 +443,13 @@ static void del_vq(struct virtio_pci_vq_info *info)
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
if (vp_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
/* Flush the write out to device */
ioread16(&vp_dev->common->queue_msix_vector);
vp_ioread16(&vp_dev->common->queue_msix_vector);
}
if (!vp_dev->notify_base)
@ -577,9 +615,6 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
}
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
if (virtio_device_is_legacy_only(vp_dev->vdev.id))
return -ENODEV;
/* check for a common config: if not, use legacy mode (bar 0). */
common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
IORESOURCE_IO | IORESOURCE_MEM);

4
include/linux/lguest.h
View file

@ -61,8 +61,8 @@ struct lguest_data {
u32 tsc_khz;
/* Fields initialized by the Guest at boot: */
/* Instruction range to suppress interrupts even if enabled */
unsigned long noirq_start, noirq_end;
/* Instruction to suppress interrupts even if enabled */
unsigned long noirq_iret;
/* Address above which page tables are all identical. */
unsigned long kernel_address;
/* The vector to try to use for system calls (0x40 or 0x80). */

2
include/linux/virtio.h
View file

@ -108,8 +108,6 @@ struct virtio_device {
void *priv;
};
bool virtio_device_is_legacy_only(struct virtio_device_id id);
static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{
return container_of(_dev, struct virtio_device, dev);

16
include/linux/virtio_config.h
View file

@ -298,13 +298,6 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
} \
} while(0)
static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
{
u8 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
}
/* Read @count fields, @bytes each. */
static inline void __virtio_cread_many(struct virtio_device *vdev,
unsigned int offset,
@ -326,7 +319,6 @@ static inline void __virtio_cread_many(struct virtio_device *vdev,
} while (gen != old);
}
static inline void virtio_cread_bytes(struct virtio_device *vdev,
unsigned int offset,
void *buf, size_t len)
@ -334,6 +326,13 @@ static inline void virtio_cread_bytes(struct virtio_device *vdev,
__virtio_cread_many(vdev, offset, buf, len, 1);
}
static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
{
u8 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
}
static inline void virtio_cwrite8(struct virtio_device *vdev,
unsigned int offset, u8 val)
{
@ -374,7 +373,6 @@ static inline u64 virtio_cread64(struct virtio_device *vdev,
unsigned int offset)
{
u64 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
return virtio64_to_cpu(vdev, (__force __virtio64)ret);
}

23
include/linux/virtio_ring.h
View file

@ -21,19 +21,20 @@
* actually quite cheap.
*/
#ifdef CONFIG_SMP
static inline void virtio_mb(bool weak_barriers)
{
#ifdef CONFIG_SMP
if (weak_barriers)
smp_mb();
else
#endif
mb();
}
static inline void virtio_rmb(bool weak_barriers)
{
if (weak_barriers)
smp_rmb();
dma_rmb();
else
rmb();
}
@ -41,26 +42,10 @@ static inline void virtio_rmb(bool weak_barriers)
static inline void virtio_wmb(bool weak_barriers)
{
if (weak_barriers)
smp_wmb();
dma_wmb();
else
wmb();
}
#else
static inline void virtio_mb(bool weak_barriers)
{
mb();
}
static inline void virtio_rmb(bool weak_barriers)
{
rmb();
}
static inline void virtio_wmb(bool weak_barriers)
{
wmb();
}
#endif
struct virtio_device;
struct virtqueue;

1
include/uapi/linux/Kbuild
View file

@ -431,6 +431,7 @@ header-y += virtio_blk.h
header-y += virtio_config.h
header-y += virtio_console.h
header-y += virtio_ids.h
header-y += virtio_input.h
header-y += virtio_net.h
header-y += virtio_pci.h
header-y += virtio_ring.h

32
include/uapi/linux/virtio_balloon.h
View file

@ -25,6 +25,7 @@
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
@ -38,9 +39,9 @@
struct virtio_balloon_config {
/* Number of pages host wants Guest to give up. */
__le32 num_pages;
__u32 num_pages;
/* Number of pages we've actually got in balloon. */
__le32 actual;
__u32 actual;
};
#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
@ -51,9 +52,32 @@ struct virtio_balloon_config {
#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
#define VIRTIO_BALLOON_S_NR 6
/*
* Memory statistics structure.
* Driver fills an array of these structures and passes to device.
*
* NOTE: fields are laid out in a way that would make compiler add padding
* between and after fields, so we have to use compiler-specific attributes to
* pack it, to disable this padding. This also often causes compiler to
* generate suboptimal code.
*
* We maintain this statistics structure format for backwards compatibility,
* but don't follow this example.
*
* If implementing a similar structure, do something like the below instead:
* struct virtio_balloon_stat {
* __virtio16 tag;
* __u8 reserved[6];
* __virtio64 val;
* };
*
* In other words, add explicit reserved fields to align field and
* structure boundaries at field size, avoiding compiler padding
* without the packed attribute.
*/
struct virtio_balloon_stat {
__u16 tag;
__u64 val;
__virtio16 tag;
__virtio64 val;
} __attribute__((packed));
#endif /* _LINUX_VIRTIO_BALLOON_H */

1
include/uapi/linux/virtio_ids.h
View file

@ -39,5 +39,6 @@
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
#define VIRTIO_ID_INPUT 18 /* virtio input */
#endif /* _LINUX_VIRTIO_IDS_H */

76
include/uapi/linux/virtio_input.h Normal file
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@ -0,0 +1,76 @@
#ifndef _LINUX_VIRTIO_INPUT_H
#define _LINUX_VIRTIO_INPUT_H
/* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#include <linux/types.h>
enum virtio_input_config_select {
VIRTIO_INPUT_CFG_UNSET = 0x00,
VIRTIO_INPUT_CFG_ID_NAME = 0x01,
VIRTIO_INPUT_CFG_ID_SERIAL = 0x02,
VIRTIO_INPUT_CFG_ID_DEVIDS = 0x03,
VIRTIO_INPUT_CFG_PROP_BITS = 0x10,
VIRTIO_INPUT_CFG_EV_BITS = 0x11,
VIRTIO_INPUT_CFG_ABS_INFO = 0x12,
};
struct virtio_input_absinfo {
__u32 min;
__u32 max;
__u32 fuzz;
__u32 flat;
__u32 res;
};
struct virtio_input_devids {
__u16 bustype;
__u16 vendor;
__u16 product;
__u16 version;
};
struct virtio_input_config {
__u8 select;
__u8 subsel;
__u8 size;
__u8 reserved[5];
union {
char string[128];
__u8 bitmap[128];
struct virtio_input_absinfo abs;
struct virtio_input_devids ids;
} u;
};
struct virtio_input_event {
__le16 type;
__le16 code;
__le32 value;
};
#endif /* _LINUX_VIRTIO_INPUT_H */