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qemu-e2k/hw/display/xenfb.c
Wei Liu 4df26e88ee xenfb: use the correct condition to avoid excessive looping 
In commit ac0487e1 ("xenfb.c: avoid expensive loops when prod <=
out_cons"), ">=" was used. In fact, a full ring is a legit state.
Correct the test to use ">".

Reported-by: "Hao, Xudong" <xudong.hao@intel.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Tested-by: "Hao, Xudong" <xudong.hao@intel.com>
Acked-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
2016-04-12 10:16:08 -07:00

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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 "qemu/osdep.h"
#include <sys/mman.h>
#include "hw/hw.h"
#include "ui/console.h"
#include "sysemu/char.h"
#include "hw/xen/xen_backend.h"
#include <xen/event_channel.h>
#include <xen/io/fbif.h>
#include <xen/io/kbdif.h>
#include <xen/io/protocols.h>
#include "trace.h"
#ifndef BTN_LEFT
#define BTN_LEFT 0x110 /* from <linux/input.h> */
#endif
/* -------------------------------------------------------------------- */
struct common {
struct XenDevice xendev; /* must be first */
void *page;
QemuConsole *con;
};
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 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)
{
uint64_t val;
xen_pfn_t mfn;
if (xenstore_read_fe_uint64(&c->xendev, "page-ref", &val) == -1)
return -1;
mfn = (xen_pfn_t)val;
assert(val == mfn);
if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1)
return -1;
c->page = xenforeignmemory_map(xen_fmem, c->xendev.dom,
PROT_READ | PROT_WRITE, 1, &mfn, NULL);
if (c->page == NULL)
return -1;
xen_be_bind_evtchn(&c->xendev);
xen_be_printf(&c->xendev, 1, "ring mfn %"PRI_xen_pfn", 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) {
xenforeignmemory_unmap(xen_fmem, c->page, 1);
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;
event.motion.rel_z = rel_z;
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;
event.pos.rel_z = z;
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;
DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
int dw = surface_width(surface);
int dh = surface_height(surface);
int i;
trace_xenfb_mouse_event(opaque, dx, dy, dz, button_state,
xenfb->abs_pointer_wanted);
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_initialise(struct XenDevice *xendev)
{
struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
int rc;
if (!in->c.con) {
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);
return 0;
}
static void input_connected(struct XenDevice *xendev)
{
struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
if (xenstore_read_fe_int(xendev, "request-abs-pointer",
&in->abs_pointer_wanted) == -1) {
in->abs_pointer_wanted = 0;
}
if (in->qmouse) {
qemu_remove_mouse_event_handler(in->qmouse);
}
trace_xenfb_input_connected(xendev, in->abs_pointer_wanted);
in->qmouse = qemu_add_mouse_event_handler(xenfb_mouse_event, in,
in->abs_pointer_wanted,
"Xen PVFB Mouse");
}
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, xen_pfn_t *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;
xen_pfn_t *pgmfns = NULL;
xen_pfn_t *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 = g_malloc0(sizeof(xen_pfn_t) * n_fbdirs);
fbmfns = g_malloc0(sizeof(xen_pfn_t) * xenfb->fbpages);
xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
map = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
PROT_READ, n_fbdirs, pgmfns, NULL);
if (map == NULL)
goto out;
xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
xenforeignmemory_unmap(xen_fmem, map, n_fbdirs);
xenfb->pixels = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
PROT_READ, xenfb->fbpages, fbmfns, NULL);
if (xenfb->pixels == NULL)
goto out;
ret = 0; /* all is fine */
out:
g_free(pgmfns);
g_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)
{
DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
int line, oops = 0;
int bpp = surface_bits_per_pixel(surface);
int linesize = surface_stride(surface);
uint8_t *data = surface_data(surface);
if (!is_buffer_shared(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_gfx_update(xenfb->c.con, 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;
DisplaySurface *surface;
int i;
if (xenfb->c.xendev.be_state != XenbusStateConnected)
return;
if (!xenfb->feature_update) {
/* we don't get update notifications, thus use the
* sledge hammer approach ... */
xenfb->up_fullscreen = 1;
}
/* resize if needed */
if (xenfb->do_resize) {
pixman_format_code_t format;
xenfb->do_resize = 0;
switch (xenfb->depth) {
case 16:
case 32:
/* console.c supported depth -> buffer can be used directly */
format = qemu_default_pixman_format(xenfb->depth, true);
surface = qemu_create_displaysurface_from
(xenfb->width, xenfb->height, format,
xenfb->row_stride, xenfb->pixels + xenfb->offset);
break;
default:
/* we must convert stuff */
surface = qemu_create_displaysurface(xenfb->width, xenfb->height);
break;
}
dpy_gfx_replace_surface(xenfb->c.con, surface);
xen_be_printf(&xenfb->c.xendev, 1, "update: resizing: %dx%d @ %d bpp%s\n",
xenfb->width, xenfb->height, xenfb->depth,
is_buffer_shared(surface) ? " (shared)" : "");
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;
}
static void xenfb_update_interval(void *opaque, uint64_t interval)
{
struct XenFB *xenfb = opaque;
if (xenfb->feature_update) {
#ifdef XENFB_TYPE_REFRESH_PERIOD
if (xenfb_queue_full(xenfb)) {
return;
}
xenfb_send_refresh_period(xenfb, interval);
#endif
}
}
/* 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, out_cons;
struct xenfb_page *page = xenfb->c.page;
prod = page->out_prod;
out_cons = page->out_cons;
if (prod - out_cons > XENFB_OUT_RING_LEN) {
return;
}
xen_rmb(); /* ensure we see ring contents up to prod */
for (cons = out_cons; cons != prod; cons++) {
union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);
uint8_t type = event->type;
int x, y, w, h;
switch (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)
{
#ifdef XENFB_TYPE_RESIZE
xenstore_write_be_int(xendev, "feature-resize", 1);
#endif
return 0;
}
static int fb_initialise(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.
*/
xenforeignmemory_unmap(xen_fmem, fb->pixels, fb->fbpages);
fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
-1, 0);
if (fb->pixels == MAP_FAILED) {
xen_be_printf(xendev, 0,
"Couldn't replace the framebuffer with anonymous memory errno=%d\n",
errno);
}
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,
.initialise = input_initialise,
.connected = input_connected,
.disconnect = input_disconnect,
.event = input_event,
};
struct XenDevOps xen_framebuffer_ops = {
.size = sizeof(struct XenFB),
.init = fb_init,
.initialise = fb_initialise,
.disconnect = fb_disconnect,
.event = fb_event,
.frontend_changed = fb_frontend_changed,
};
static const GraphicHwOps xenfb_ops = {
.invalidate = xenfb_invalidate,
.gfx_update = xenfb_update,
.update_interval = xenfb_update_interval,
};
/*
* 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.con = graphic_console_init(NULL, 0, &xenfb_ops, fb);
fb->have_console = 1;
/* vkbd */
in = container_of(xin, struct XenInput, c.xendev);
in->c.con = fb->c.con;
/* retry ->init() */
xen_be_check_state(xin);
xen_be_check_state(xfb);
}
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