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qemu/hw/xenfb.c
Stefano Stabellini 37cdfcf194 xen: add vkbd support for PV on HVM guests 
Register the vkbd backend even when running as device emulator for HVM
guests: it is useful because it doesn't need a frequent timer like usb.

Check whether the XenInput DisplayState has been set in the initialise
state, rather than the input state.
In case the DisplayState hasn't been set and there is no vfb for this
domain, then set the XenInput DisplayState to the default one.

Changed in v2:

- use qemu_free instead of free;

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-07-17 01:54:25 +02:00

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/*
* xen paravirt framebuffer backend
*
* Copyright IBM, Corp. 2005-2006
* Copyright Red Hat, Inc. 2006-2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>,
* Markus Armbruster <armbru@redhat.com>,
* Daniel P. Berrange <berrange@redhat.com>,
* Pat Campbell <plc@novell.com>,
* Gerd Hoffmann <kraxel@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; under version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <xs.h>
#include <xenctrl.h>
#include <xen/event_channel.h>
#include <xen/io/xenbus.h>
#include <xen/io/fbif.h>
#include <xen/io/kbdif.h>
#include <xen/io/protocols.h>
#include "hw.h"
#include "console.h"
#include "qemu-char.h"
#include "xen_backend.h"
#ifndef BTN_LEFT
#define BTN_LEFT 0x110 /* from <linux/input.h> */
#endif
/* -------------------------------------------------------------------- */
struct common {
struct XenDevice xendev; /* must be first */
void *page;
DisplayState *ds;
};
struct XenInput {
struct common c;
int abs_pointer_wanted; /* Whether guest supports absolute pointer */
int button_state; /* Last seen pointer button state */
int extended;
QEMUPutMouseEntry *qmouse;
};
#define UP_QUEUE 8
struct XenFB {
struct common c;
size_t fb_len;
int row_stride;
int depth;
int width;
int height;
int offset;
void *pixels;
int fbpages;
int feature_update;
int refresh_period;
int bug_trigger;
int have_console;
int do_resize;
struct {
int x,y,w,h;
} up_rects[UP_QUEUE];
int up_count;
int up_fullscreen;
};
/* -------------------------------------------------------------------- */
static int common_bind(struct common *c)
{
int mfn;
if (xenstore_read_fe_int(&c->xendev, "page-ref", &mfn) == -1)
return -1;
if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1)
return -1;
c->page = xc_map_foreign_range(xen_xc, c->xendev.dom,
XC_PAGE_SIZE,
PROT_READ | PROT_WRITE, mfn);
if (c->page == NULL)
return -1;
xen_be_bind_evtchn(&c->xendev);
xen_be_printf(&c->xendev, 1, "ring mfn %d, remote-port %d, local-port %d\n",
mfn, c->xendev.remote_port, c->xendev.local_port);
return 0;
}
static void common_unbind(struct common *c)
{
xen_be_unbind_evtchn(&c->xendev);
if (c->page) {
munmap(c->page, XC_PAGE_SIZE);
c->page = NULL;
}
}
/* -------------------------------------------------------------------- */
#if 0
/*
* These two tables are not needed any more, but left in here
* intentionally as documentation, to show how scancode2linux[]
* was generated.
*
* Tables to map from scancode to Linux input layer keycode.
* Scancodes are hardware-specific. These maps assumes a
* standard AT or PS/2 keyboard which is what QEMU feeds us.
*/
const unsigned char atkbd_set2_keycode[512] = {
0, 67, 65, 63, 61, 59, 60, 88, 0, 68, 66, 64, 62, 15, 41,117,
0, 56, 42, 93, 29, 16, 2, 0, 0, 0, 44, 31, 30, 17, 3, 0,
0, 46, 45, 32, 18, 5, 4, 95, 0, 57, 47, 33, 20, 19, 6,183,
0, 49, 48, 35, 34, 21, 7,184, 0, 0, 50, 36, 22, 8, 9,185,
0, 51, 37, 23, 24, 11, 10, 0, 0, 52, 53, 38, 39, 25, 12, 0,
0, 89, 40, 0, 26, 13, 0, 0, 58, 54, 28, 27, 0, 43, 0, 85,
0, 86, 91, 90, 92, 0, 14, 94, 0, 79,124, 75, 71,121, 0, 0,
82, 83, 80, 76, 77, 72, 1, 69, 87, 78, 81, 74, 55, 73, 70, 99,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
217,100,255, 0, 97,165, 0, 0,156, 0, 0, 0, 0, 0, 0,125,
173,114, 0,113, 0, 0, 0,126,128, 0, 0,140, 0, 0, 0,127,
159, 0,115, 0,164, 0, 0,116,158, 0,150,166, 0, 0, 0,142,
157, 0, 0, 0, 0, 0, 0, 0,155, 0, 98, 0, 0,163, 0, 0,
226, 0, 0, 0, 0, 0, 0, 0, 0,255, 96, 0, 0, 0,143, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,107, 0,105,102, 0, 0,112,
110,111,108,112,106,103, 0,119, 0,118,109, 0, 99,104,119, 0,
};
const unsigned char atkbd_unxlate_table[128] = {
0,118, 22, 30, 38, 37, 46, 54, 61, 62, 70, 69, 78, 85,102, 13,
21, 29, 36, 45, 44, 53, 60, 67, 68, 77, 84, 91, 90, 20, 28, 27,
35, 43, 52, 51, 59, 66, 75, 76, 82, 14, 18, 93, 26, 34, 33, 42,
50, 49, 58, 65, 73, 74, 89,124, 17, 41, 88, 5, 6, 4, 12, 3,
11, 2, 10, 1, 9,119,126,108,117,125,123,107,115,116,121,105,
114,122,112,113,127, 96, 97,120, 7, 15, 23, 31, 39, 47, 55, 63,
71, 79, 86, 94, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 87,111,
19, 25, 57, 81, 83, 92, 95, 98, 99,100,101,103,104,106,109,110
};
#endif
/*
* for (i = 0; i < 128; i++) {
* scancode2linux[i] = atkbd_set2_keycode[atkbd_unxlate_table[i]];
* scancode2linux[i | 0x80] = atkbd_set2_keycode[atkbd_unxlate_table[i] | 0x80];
* }
*/
static const unsigned char scancode2linux[512] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 99, 0, 86, 87, 88,117, 0, 0, 95,183,184,185,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93, 0, 0, 89, 0, 0, 85, 91, 90, 92, 0, 94, 0,124,121, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
165, 0, 0, 0, 0, 0, 0, 0, 0,163, 0, 0, 96, 97, 0, 0,
113,140,164, 0,166, 0, 0, 0, 0, 0,255, 0, 0, 0,114, 0,
115, 0,150, 0, 0, 98,255, 99,100, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0,119,119,102,103,104, 0,105,112,106,118,107,
108,109,110,111, 0, 0, 0, 0, 0, 0, 0,125,126,127,116,142,
0, 0, 0,143, 0,217,156,173,128,159,158,157,155,226, 0,112,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
/* Send an event to the keyboard frontend driver */
static int xenfb_kbd_event(struct XenInput *xenfb,
union xenkbd_in_event *event)
{
struct xenkbd_page *page = xenfb->c.page;
uint32_t prod;
if (xenfb->c.xendev.be_state != XenbusStateConnected)
return 0;
if (!page)
return 0;
prod = page->in_prod;
if (prod - page->in_cons == XENKBD_IN_RING_LEN) {
errno = EAGAIN;
return -1;
}
xen_mb(); /* ensure ring space available */
XENKBD_IN_RING_REF(page, prod) = *event;
xen_wmb(); /* ensure ring contents visible */
page->in_prod = prod + 1;
return xen_be_send_notify(&xenfb->c.xendev);
}
/* Send a keyboard (or mouse button) event */
static int xenfb_send_key(struct XenInput *xenfb, bool down, int keycode)
{
union xenkbd_in_event event;
memset(&event, 0, XENKBD_IN_EVENT_SIZE);
event.type = XENKBD_TYPE_KEY;
event.key.pressed = down ? 1 : 0;
event.key.keycode = keycode;
return xenfb_kbd_event(xenfb, &event);
}
/* Send a relative mouse movement event */
static int xenfb_send_motion(struct XenInput *xenfb,
int rel_x, int rel_y, int rel_z)
{
union xenkbd_in_event event;
memset(&event, 0, XENKBD_IN_EVENT_SIZE);
event.type = XENKBD_TYPE_MOTION;
event.motion.rel_x = rel_x;
event.motion.rel_y = rel_y;
#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030207
event.motion.rel_z = rel_z;
#endif
return xenfb_kbd_event(xenfb, &event);
}
/* Send an absolute mouse movement event */
static int xenfb_send_position(struct XenInput *xenfb,
int abs_x, int abs_y, int z)
{
union xenkbd_in_event event;
memset(&event, 0, XENKBD_IN_EVENT_SIZE);
event.type = XENKBD_TYPE_POS;
event.pos.abs_x = abs_x;
event.pos.abs_y = abs_y;
#if __XEN_LATEST_INTERFACE_VERSION__ == 0x00030207
event.pos.abs_z = z;
#endif
#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030208
event.pos.rel_z = z;
#endif
return xenfb_kbd_event(xenfb, &event);
}
/*
* Send a key event from the client to the guest OS
* QEMU gives us a raw scancode from an AT / PS/2 style keyboard.
* We have to turn this into a Linux Input layer keycode.
*
* Extra complexity from the fact that with extended scancodes
* (like those produced by arrow keys) this method gets called
* twice, but we only want to send a single event. So we have to
* track the '0xe0' scancode state & collapse the extended keys
* as needed.
*
* Wish we could just send scancodes straight to the guest which
* already has code for dealing with this...
*/
static void xenfb_key_event(void *opaque, int scancode)
{
struct XenInput *xenfb = opaque;
int down = 1;
if (scancode == 0xe0) {
xenfb->extended = 1;
return;
} else if (scancode & 0x80) {
scancode &= 0x7f;
down = 0;
}
if (xenfb->extended) {
scancode |= 0x80;
xenfb->extended = 0;
}
xenfb_send_key(xenfb, down, scancode2linux[scancode]);
}
/*
* Send a mouse event from the client to the guest OS
*
* The QEMU mouse can be in either relative, or absolute mode.
* Movement is sent separately from button state, which has to
* be encoded as virtual key events. We also don't actually get
* given any button up/down events, so have to track changes in
* the button state.
*/
static void xenfb_mouse_event(void *opaque,
int dx, int dy, int dz, int button_state)
{
struct XenInput *xenfb = opaque;
int dw = ds_get_width(xenfb->c.ds);
int dh = ds_get_height(xenfb->c.ds);
int i;
if (xenfb->abs_pointer_wanted)
xenfb_send_position(xenfb,
dx * (dw - 1) / 0x7fff,
dy * (dh - 1) / 0x7fff,
dz);
else
xenfb_send_motion(xenfb, dx, dy, dz);
for (i = 0 ; i < 8 ; i++) {
int lastDown = xenfb->button_state & (1 << i);
int down = button_state & (1 << i);
if (down == lastDown)
continue;
if (xenfb_send_key(xenfb, down, BTN_LEFT+i) < 0)
return;
}
xenfb->button_state = button_state;
}
static int input_init(struct XenDevice *xendev)
{
xenstore_write_be_int(xendev, "feature-abs-pointer", 1);
return 0;
}
static int input_connect(struct XenDevice *xendev)
{
struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
int rc;
if (xenstore_read_fe_int(xendev, "request-abs-pointer",
&in->abs_pointer_wanted) == -1)
in->abs_pointer_wanted = 0;
if (!in->c.ds) {
char *vfb = xenstore_read_str(NULL, "device/vfb");
if (vfb == NULL) {
/* there is no vfb, run vkbd on its own */
in->c.ds = get_displaystate();
} else {
qemu_free(vfb);
xen_be_printf(xendev, 1, "ds not set (yet)\n");
return -1;
}
}
rc = common_bind(&in->c);
if (rc != 0)
return rc;
qemu_add_kbd_event_handler(xenfb_key_event, in);
in->qmouse = qemu_add_mouse_event_handler(xenfb_mouse_event, in,
in->abs_pointer_wanted,
"Xen PVFB Mouse");
return 0;
}
static void input_disconnect(struct XenDevice *xendev)
{
struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
if (in->qmouse) {
qemu_remove_mouse_event_handler(in->qmouse);
in->qmouse = NULL;
}
qemu_add_kbd_event_handler(NULL, NULL);
common_unbind(&in->c);
}
static void input_event(struct XenDevice *xendev)
{
struct XenInput *xenfb = container_of(xendev, struct XenInput, c.xendev);
struct xenkbd_page *page = xenfb->c.page;
/* We don't understand any keyboard events, so just ignore them. */
if (page->out_prod == page->out_cons)
return;
page->out_cons = page->out_prod;
xen_be_send_notify(&xenfb->c.xendev);
}
/* -------------------------------------------------------------------- */
static void xenfb_copy_mfns(int mode, int count, unsigned long *dst, void *src)
{
uint32_t *src32 = src;
uint64_t *src64 = src;
int i;
for (i = 0; i < count; i++)
dst[i] = (mode == 32) ? src32[i] : src64[i];
}
static int xenfb_map_fb(struct XenFB *xenfb)
{
struct xenfb_page *page = xenfb->c.page;
char *protocol = xenfb->c.xendev.protocol;
int n_fbdirs;
unsigned long *pgmfns = NULL;
unsigned long *fbmfns = NULL;
void *map, *pd;
int mode, ret = -1;
/* default to native */
pd = page->pd;
mode = sizeof(unsigned long) * 8;
if (!protocol) {
/*
* Undefined protocol, some guesswork needed.
*
* Old frontends which don't set the protocol use
* one page directory only, thus pd[1] must be zero.
* pd[1] of the 32bit struct layout and the lower
* 32 bits of pd[0] of the 64bit struct layout have
* the same location, so we can check that ...
*/
uint32_t *ptr32 = NULL;
uint32_t *ptr64 = NULL;
#if defined(__i386__)
ptr32 = (void*)page->pd;
ptr64 = ((void*)page->pd) + 4;
#elif defined(__x86_64__)
ptr32 = ((void*)page->pd) - 4;
ptr64 = (void*)page->pd;
#endif
if (ptr32) {
if (ptr32[1] == 0) {
mode = 32;
pd = ptr32;
} else {
mode = 64;
pd = ptr64;
}
}
#if defined(__x86_64__)
} else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
/* 64bit dom0, 32bit domU */
mode = 32;
pd = ((void*)page->pd) - 4;
#elif defined(__i386__)
} else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
/* 32bit dom0, 64bit domU */
mode = 64;
pd = ((void*)page->pd) + 4;
#endif
}
if (xenfb->pixels) {
munmap(xenfb->pixels, xenfb->fbpages * XC_PAGE_SIZE);
xenfb->pixels = NULL;
}
xenfb->fbpages = (xenfb->fb_len + (XC_PAGE_SIZE - 1)) / XC_PAGE_SIZE;
n_fbdirs = xenfb->fbpages * mode / 8;
n_fbdirs = (n_fbdirs + (XC_PAGE_SIZE - 1)) / XC_PAGE_SIZE;
pgmfns = qemu_mallocz(sizeof(unsigned long) * n_fbdirs);
fbmfns = qemu_mallocz(sizeof(unsigned long) * xenfb->fbpages);
xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
map = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
PROT_READ, pgmfns, n_fbdirs);
if (map == NULL)
goto out;
xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
munmap(map, n_fbdirs * XC_PAGE_SIZE);
xenfb->pixels = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
PROT_READ | PROT_WRITE, fbmfns, xenfb->fbpages);
if (xenfb->pixels == NULL)
goto out;
ret = 0; /* all is fine */
out:
qemu_free(pgmfns);
qemu_free(fbmfns);
return ret;
}
static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
int width, int height, int depth,
size_t fb_len, int offset, int row_stride)
{
size_t mfn_sz = sizeof(*((struct xenfb_page *)0)->pd);
size_t pd_len = sizeof(((struct xenfb_page *)0)->pd) / mfn_sz;
size_t fb_pages = pd_len * XC_PAGE_SIZE / mfn_sz;
size_t fb_len_max = fb_pages * XC_PAGE_SIZE;
int max_width, max_height;
if (fb_len_lim > fb_len_max) {
xen_be_printf(&xenfb->c.xendev, 0, "fb size limit %zu exceeds %zu, corrected\n",
fb_len_lim, fb_len_max);
fb_len_lim = fb_len_max;
}
if (fb_len_lim && fb_len > fb_len_lim) {
xen_be_printf(&xenfb->c.xendev, 0, "frontend fb size %zu limited to %zu\n",
fb_len, fb_len_lim);
fb_len = fb_len_lim;
}
if (depth != 8 && depth != 16 && depth != 24 && depth != 32) {
xen_be_printf(&xenfb->c.xendev, 0, "can't handle frontend fb depth %d\n",
depth);
return -1;
}
if (row_stride <= 0 || row_stride > fb_len) {
xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend stride %d\n", row_stride);
return -1;
}
max_width = row_stride / (depth / 8);
if (width < 0 || width > max_width) {
xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend width %d limited to %d\n",
width, max_width);
width = max_width;
}
if (offset < 0 || offset >= fb_len) {
xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend offset %d (max %zu)\n",
offset, fb_len - 1);
return -1;
}
max_height = (fb_len - offset) / row_stride;
if (height < 0 || height > max_height) {
xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend height %d limited to %d\n",
height, max_height);
height = max_height;
}
xenfb->fb_len = fb_len;
xenfb->row_stride = row_stride;
xenfb->depth = depth;
xenfb->width = width;
xenfb->height = height;
xenfb->offset = offset;
xenfb->up_fullscreen = 1;
xenfb->do_resize = 1;
xen_be_printf(&xenfb->c.xendev, 1, "framebuffer %dx%dx%d offset %d stride %d\n",
width, height, depth, offset, row_stride);
return 0;
}
/* A convenient function for munging pixels between different depths */
#define BLT(SRC_T,DST_T,RSB,GSB,BSB,RDB,GDB,BDB) \
for (line = y ; line < (y+h) ; line++) { \
SRC_T *src = (SRC_T *)(xenfb->pixels \
+ xenfb->offset \
+ (line * xenfb->row_stride) \
+ (x * xenfb->depth / 8)); \
DST_T *dst = (DST_T *)(data \
+ (line * linesize) \
+ (x * bpp / 8)); \
int col; \
const int RSS = 32 - (RSB + GSB + BSB); \
const int GSS = 32 - (GSB + BSB); \
const int BSS = 32 - (BSB); \
const uint32_t RSM = (~0U) << (32 - RSB); \
const uint32_t GSM = (~0U) << (32 - GSB); \
const uint32_t BSM = (~0U) << (32 - BSB); \
const int RDS = 32 - (RDB + GDB + BDB); \
const int GDS = 32 - (GDB + BDB); \
const int BDS = 32 - (BDB); \
const uint32_t RDM = (~0U) << (32 - RDB); \
const uint32_t GDM = (~0U) << (32 - GDB); \
const uint32_t BDM = (~0U) << (32 - BDB); \
for (col = x ; col < (x+w) ; col++) { \
uint32_t spix = *src; \
*dst = (((spix << RSS) & RSM & RDM) >> RDS) | \
(((spix << GSS) & GSM & GDM) >> GDS) | \
(((spix << BSS) & BSM & BDM) >> BDS); \
src = (SRC_T *) ((unsigned long) src + xenfb->depth / 8); \
dst = (DST_T *) ((unsigned long) dst + bpp / 8); \
} \
}
/*
* This copies data from the guest framebuffer region, into QEMU's
* displaysurface. qemu uses 16 or 32 bpp. In case the pv framebuffer
* uses something else we must convert and copy, otherwise we can
* supply the buffer directly and no thing here.
*/
static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
{
int line, oops = 0;
int bpp = ds_get_bits_per_pixel(xenfb->c.ds);
int linesize = ds_get_linesize(xenfb->c.ds);
uint8_t *data = ds_get_data(xenfb->c.ds);
if (!is_buffer_shared(xenfb->c.ds->surface)) {
switch (xenfb->depth) {
case 8:
if (bpp == 16) {
BLT(uint8_t, uint16_t, 3, 3, 2, 5, 6, 5);
} else if (bpp == 32) {
BLT(uint8_t, uint32_t, 3, 3, 2, 8, 8, 8);
} else {
oops = 1;
}
break;
case 24:
if (bpp == 16) {
BLT(uint32_t, uint16_t, 8, 8, 8, 5, 6, 5);
} else if (bpp == 32) {
BLT(uint32_t, uint32_t, 8, 8, 8, 8, 8, 8);
} else {
oops = 1;
}
break;
default:
oops = 1;
}
}
if (oops) /* should not happen */
xen_be_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n",
__FUNCTION__, xenfb->depth, bpp);
dpy_update(xenfb->c.ds, x, y, w, h);
}
#ifdef XENFB_TYPE_REFRESH_PERIOD
static int xenfb_queue_full(struct XenFB *xenfb)
{
struct xenfb_page *page = xenfb->c.page;
uint32_t cons, prod;
if (!page)
return 1;
prod = page->in_prod;
cons = page->in_cons;
return prod - cons == XENFB_IN_RING_LEN;
}
static void xenfb_send_event(struct XenFB *xenfb, union xenfb_in_event *event)
{
uint32_t prod;
struct xenfb_page *page = xenfb->c.page;
prod = page->in_prod;
/* caller ensures !xenfb_queue_full() */
xen_mb(); /* ensure ring space available */
XENFB_IN_RING_REF(page, prod) = *event;
xen_wmb(); /* ensure ring contents visible */
page->in_prod = prod + 1;
xen_be_send_notify(&xenfb->c.xendev);
}
static void xenfb_send_refresh_period(struct XenFB *xenfb, int period)
{
union xenfb_in_event event;
memset(&event, 0, sizeof(event));
event.type = XENFB_TYPE_REFRESH_PERIOD;
event.refresh_period.period = period;
xenfb_send_event(xenfb, &event);
}
#endif
/*
* Periodic update of display.
* Also transmit the refresh interval to the frontend.
*
* Never ever do any qemu display operations
* (resize, screen update) outside this function.
* Our screen might be inactive. When asked for
* an update we know it is active.
*/
static void xenfb_update(void *opaque)
{
struct XenFB *xenfb = opaque;
int i;
if (xenfb->c.xendev.be_state != XenbusStateConnected)
return;
if (xenfb->feature_update) {
#ifdef XENFB_TYPE_REFRESH_PERIOD
struct DisplayChangeListener *l;
int period = 99999999;
int idle = 1;
if (xenfb_queue_full(xenfb))
return;
for (l = xenfb->c.ds->listeners; l != NULL; l = l->next) {
if (l->idle)
continue;
idle = 0;
if (!l->gui_timer_interval) {
if (period > GUI_REFRESH_INTERVAL)
period = GUI_REFRESH_INTERVAL;
} else {
if (period > l->gui_timer_interval)
period = l->gui_timer_interval;
}
}
if (idle)
period = XENFB_NO_REFRESH;
if (xenfb->refresh_period != period) {
xenfb_send_refresh_period(xenfb, period);
xenfb->refresh_period = period;
xen_be_printf(&xenfb->c.xendev, 1, "refresh period: %d\n", period);
}
#else
; /* nothing */
#endif
} else {
/* we don't get update notifications, thus use the
* sledge hammer approach ... */
xenfb->up_fullscreen = 1;
}
/* resize if needed */
if (xenfb->do_resize) {
xenfb->do_resize = 0;
switch (xenfb->depth) {
case 16:
case 32:
/* console.c supported depth -> buffer can be used directly */
qemu_free_displaysurface(xenfb->c.ds);
xenfb->c.ds->surface = qemu_create_displaysurface_from
(xenfb->width, xenfb->height, xenfb->depth,
xenfb->row_stride, xenfb->pixels + xenfb->offset);
break;
default:
/* we must convert stuff */
qemu_resize_displaysurface(xenfb->c.ds, xenfb->width, xenfb->height);
break;
}
xen_be_printf(&xenfb->c.xendev, 1, "update: resizing: %dx%d @ %d bpp%s\n",
xenfb->width, xenfb->height, xenfb->depth,
is_buffer_shared(xenfb->c.ds->surface) ? " (shared)" : "");
dpy_resize(xenfb->c.ds);
xenfb->up_fullscreen = 1;
}
/* run queued updates */
if (xenfb->up_fullscreen) {
xen_be_printf(&xenfb->c.xendev, 3, "update: fullscreen\n");
xenfb_guest_copy(xenfb, 0, 0, xenfb->width, xenfb->height);
} else if (xenfb->up_count) {
xen_be_printf(&xenfb->c.xendev, 3, "update: %d rects\n", xenfb->up_count);
for (i = 0; i < xenfb->up_count; i++)
xenfb_guest_copy(xenfb,
xenfb->up_rects[i].x,
xenfb->up_rects[i].y,
xenfb->up_rects[i].w,
xenfb->up_rects[i].h);
} else {
xen_be_printf(&xenfb->c.xendev, 3, "update: nothing\n");
}
xenfb->up_count = 0;
xenfb->up_fullscreen = 0;
}
/* QEMU display state changed, so refresh the framebuffer copy */
static void xenfb_invalidate(void *opaque)
{
struct XenFB *xenfb = opaque;
xenfb->up_fullscreen = 1;
}
static void xenfb_handle_events(struct XenFB *xenfb)
{
uint32_t prod, cons;
struct xenfb_page *page = xenfb->c.page;
prod = page->out_prod;
if (prod == page->out_cons)
return;
xen_rmb(); /* ensure we see ring contents up to prod */
for (cons = page->out_cons; cons != prod; cons++) {
union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);
int x, y, w, h;
switch (event->type) {
case XENFB_TYPE_UPDATE:
if (xenfb->up_count == UP_QUEUE)
xenfb->up_fullscreen = 1;
if (xenfb->up_fullscreen)
break;
x = MAX(event->update.x, 0);
y = MAX(event->update.y, 0);
w = MIN(event->update.width, xenfb->width - x);
h = MIN(event->update.height, xenfb->height - y);
if (w < 0 || h < 0) {
xen_be_printf(&xenfb->c.xendev, 1, "bogus update ignored\n");
break;
}
if (x != event->update.x ||
y != event->update.y ||
w != event->update.width ||
h != event->update.height) {
xen_be_printf(&xenfb->c.xendev, 1, "bogus update clipped\n");
}
if (w == xenfb->width && h > xenfb->height / 2) {
/* scroll detector: updated more than 50% of the lines,
* don't bother keeping track of the rectangles then */
xenfb->up_fullscreen = 1;
} else {
xenfb->up_rects[xenfb->up_count].x = x;
xenfb->up_rects[xenfb->up_count].y = y;
xenfb->up_rects[xenfb->up_count].w = w;
xenfb->up_rects[xenfb->up_count].h = h;
xenfb->up_count++;
}
break;
#ifdef XENFB_TYPE_RESIZE
case XENFB_TYPE_RESIZE:
if (xenfb_configure_fb(xenfb, xenfb->fb_len,
event->resize.width,
event->resize.height,
event->resize.depth,
xenfb->fb_len,
event->resize.offset,
event->resize.stride) < 0)
break;
xenfb_invalidate(xenfb);
break;
#endif
}
}
xen_mb(); /* ensure we're done with ring contents */
page->out_cons = cons;
}
static int fb_init(struct XenDevice *xendev)
{
struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
fb->refresh_period = -1;
#ifdef XENFB_TYPE_RESIZE
xenstore_write_be_int(xendev, "feature-resize", 1);
#endif
return 0;
}
static int fb_connect(struct XenDevice *xendev)
{
struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
struct xenfb_page *fb_page;
int videoram;
int rc;
if (xenstore_read_fe_int(xendev, "videoram", &videoram) == -1)
videoram = 0;
rc = common_bind(&fb->c);
if (rc != 0)
return rc;
fb_page = fb->c.page;
rc = xenfb_configure_fb(fb, videoram * 1024 * 1024U,
fb_page->width, fb_page->height, fb_page->depth,
fb_page->mem_length, 0, fb_page->line_length);
if (rc != 0)
return rc;
rc = xenfb_map_fb(fb);
if (rc != 0)
return rc;
#if 0 /* handled in xen_init_display() for now */
if (!fb->have_console) {
fb->c.ds = graphic_console_init(xenfb_update,
xenfb_invalidate,
NULL,
NULL,
fb);
fb->have_console = 1;
}
#endif
if (xenstore_read_fe_int(xendev, "feature-update", &fb->feature_update) == -1)
fb->feature_update = 0;
if (fb->feature_update)
xenstore_write_be_int(xendev, "request-update", 1);
xen_be_printf(xendev, 1, "feature-update=%d, videoram=%d\n",
fb->feature_update, videoram);
return 0;
}
static void fb_disconnect(struct XenDevice *xendev)
{
struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
/*
* FIXME: qemu can't un-init gfx display (yet?).
* Replacing the framebuffer with anonymous shared memory
* instead. This releases the guest pages and keeps qemu happy.
*/
fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
-1, 0);
common_unbind(&fb->c);
fb->feature_update = 0;
fb->bug_trigger = 0;
}
static void fb_frontend_changed(struct XenDevice *xendev, const char *node)
{
struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
/*
* Set state to Connected *again* once the frontend switched
* to connected. We must trigger the watch a second time to
* workaround a frontend bug.
*/
if (fb->bug_trigger == 0 && strcmp(node, "state") == 0 &&
xendev->fe_state == XenbusStateConnected &&
xendev->be_state == XenbusStateConnected) {
xen_be_printf(xendev, 2, "re-trigger connected (frontend bug)\n");
xen_be_set_state(xendev, XenbusStateConnected);
fb->bug_trigger = 1; /* only once */
}
}
static void fb_event(struct XenDevice *xendev)
{
struct XenFB *xenfb = container_of(xendev, struct XenFB, c.xendev);
xenfb_handle_events(xenfb);
xen_be_send_notify(&xenfb->c.xendev);
}
/* -------------------------------------------------------------------- */
struct XenDevOps xen_kbdmouse_ops = {
.size = sizeof(struct XenInput),
.init = input_init,
.connect = input_connect,
.disconnect = input_disconnect,
.event = input_event,
};
struct XenDevOps xen_framebuffer_ops = {
.size = sizeof(struct XenFB),
.init = fb_init,
.connect = fb_connect,
.disconnect = fb_disconnect,
.event = fb_event,
.frontend_changed = fb_frontend_changed,
};
/*
* FIXME/TODO: Kill this.
* Temporary needed while DisplayState reorganization is in flight.
*/
void xen_init_display(int domid)
{
struct XenDevice *xfb, *xin;
struct XenFB *fb;
struct XenInput *in;
int i = 0;
wait_more:
i++;
main_loop_wait(true);
xfb = xen_be_find_xendev("vfb", domid, 0);
xin = xen_be_find_xendev("vkbd", domid, 0);
if (!xfb || !xin) {
if (i < 256) {
usleep(10000);
goto wait_more;
}
xen_be_printf(NULL, 1, "displaystate setup failed\n");
return;
}
/* vfb */
fb = container_of(xfb, struct XenFB, c.xendev);
fb->c.ds = graphic_console_init(xenfb_update,
xenfb_invalidate,
NULL,
NULL,
fb);
fb->have_console = 1;
/* vkbd */
in = container_of(xin, struct XenInput, c.xendev);
in->c.ds = fb->c.ds;
/* retry ->init() */
xen_be_check_state(xin);
xen_be_check_state(xfb);
}
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