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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel][PATCH][LINUX] Dynamic modes support for xenfb (2 of 2)
Markus Armbruster wrote:
> Pat Campbell <plc@xxxxxxxxxx> writes:
>
>
>> Markus Armbruster wrote:
>>
>>> Pat Campbell <plc@xxxxxxxxxx> writes:
>>>
>>>
>>>
>>>> Markus Armbruster wrote:
>>>>
>>>>
>>>>> Pat Campbell <plc@xxxxxxxxxx> writes:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Attached patch adds dynamic frame buffer resolution support to
>>>>>> the PV xenfb frame buffer driver.
>>>>>>
>>>>>> Corresponding backend IOEMU patch is required for functionality but
>>>>>> this patch is not dependent on it, preserving backwards compatibility.
>>>>>>
>>>>>> Please apply to tip of linux-2.6.18-xen
>>>>>>
>>>>>> Signed-off-by: Pat Campbell <plc@xxxxxxxxxx>
>>>>>>
>>>>>>
>>>>>>
>>>>> Adding another lock (queue_lock) to our already ticklish locking gives
>>>>> me a queasy feeling...
>>>>>
>>>>> The purpose of the lock is not obvious to me. Please explain that, in
>>>>> the code. Likewise, it's not entirely obvious that the locking works.
>>>>> Please update the "How the locks work together" comment.
>>>>>
>>>>> But before you do that, I suggest you tell us exactly what problem
>>>>> you're attempting to solve with queue_lock. Maybe we can come up with
>>>>> a less scary solution. Maybe not. But it's worth a try. If it's
>>>>> just to ensure the changes made by xenfb_set_par() are seen in
>>>>> xenfb_do_resize() correctly, a memory barrier should to the trick more
>>>>> easily.
>>>>>
>>>>>
> [Pat explains the race...]
>
>>> Your race is real.
>>>
>>> Your old code shared the resolution state (info->resize_dpy and the
>>> resolution variables in info->fb_info) between xenfb_do_resize()
>>> (running in xenfb_thread) and xenfb_set_par() (running in another
>>> thread).
>>>
>>> Your new code shares the ring buffer instead.
>>>
>>> Both methods can be made race-free with suitable synchronization.
>>>
>>> With your old code, xenfb_set_par() always succeeds. Until the
>>> backend gets around to process the XENFB_TYPE_RESIZE message, it
>>> interprets the frame buffer for the old resolution. As you argue
>>> below, this isn't fatal, it can just mess up the display somewhat.
>>>
>>> With your new code, xenfb_set_par() can take a long time (one second),
>>> and it can fail, leaving the display in a deranged state until the
>>> next resolution change. It still doesn't fully synchronize with the
>>> backend: it returns successfully after sending the message, leaving
>>> the time window until the backend receives the message open.
>>>
>>>
>> Synchronizing with the backend? I don't think this is necessary. The
>> update events that follow the resize event will be for the new size, as
>> long as the backend gets the resize event we should be ok.
>>
>
> I didn't mean to say that synchronizing with the backend is necessary.
> I just wanted to point out that your new method pays the price of
> synchronization, namely a possibly significant delay in
> xenfb_set_par(), plus an ugly failure mode there, without actually
> achieving synchronization.
>
>
>>> I'd prefer the old behavior. But I could be missing something here.
>>> Am I?
>>>
>>>
>>>
>> I like the new behavior, it seems more straight forward and does not
>> rely on the xenfb_thread() being active. Our first set_par() happens
>> during frame buffer registration which is before xenfb_thread() is
>> started. I disliked adding new code into the xenfb_update() function
>> for an event that happens rarely so will revert back to the sharing of
>> resize_dpy flag code.
>>
>> Is this how you envision xenfb_set_par() synchronization?
>>
>> static int xenfb_set_par(struct fb_info *info)
>> {
>> struct xenfb_info *xenfb_info;
>> unsigned long flags;
>>
>> xenfb_info = info->par;
>>
>> if (xenfb_info->kthread) {
>> spin_lock_irqsave(&xenfb_info->resize_lock, flags);
>> info->var.xres_virtual = info->var.xres;
>> info->var.yres_virtual = info->var.yres;
>> xenfb_info->resize_dpy = 1;
>> /* Wake up xenfb_thread() */
>> xenfb_refresh(xenfb_info, 0, 0, 1, 1);
>> while (xenfb_info->kthread && xenfb_info->resize_dpy == 1) {
>> msleep(10);
>> }
>> spin_unlock_irqrestore(&xenfb_info->resize_lock, flags);
>> }
>> return 0;
>> }
>>
>> To explain the code a liitle bit.
>> 1. Need to test for kthread because first xenfb_set_par() happens
>> before xenfb_thread() is started
>>
>
> Why can you just ignore the mode change then?
>
>
>> 2. Need to wakeup xenfb_thread via refresh as application screen events
>> are blocked waiting on the set_par to complete. Can't just set dirty,
>> will get a bogus nasty gram.
>>
>
> I'd pass an empty rectangle there:
>
> xenfb_refresh(xenfb_info, INT_MAX, INT_MAX, 0, 0);
>
> Alternatively, factor out the code to wake up the thread into a new
> function, and call that here and from __xenfb_refresh(). That would
> be cleaner.
>
>
>> 3. Testing xenfb_thread in the while loop in case xenfb_remove() is
>> called and thread is shutdown. Protects against a system shutdown
>> hang. Don't know if that can happen, defensive code.
>>
>
> Sleeps while holding a spinlock. Not good. And I didn't get the hang
> you're trying to defend against.
>
> xenfb_resize_screen() still accesses the size unsynchronized, and can
> thus see intermediate states of resolution changes.
>
>
> No, that's not what I had in mind. Let me sketch it.
>
> The first question to answer for a mutex is: what shared state does it
> protect? resize_lock protects the screen size fb_info->var.xres,
> fb_info->var.yres and the flag resize_dpy.
>
> Once that's clear, the use of the mutex becomes obvious: wrap it
> around any access of the shared state, i.e. the updating of the shared
> state it protects in xenfb_set_par() and the reading in
> xenfb_thread(). Code sketch:
>
> static void xenfb_resize_screen(struct xenfb_info *info)
> {
> if (xenfb_queue_full(info))
> return;
>
> /* caller holds info->resize_lock */
> info->resize_dpy = 0;
> xenfb_do_resize(info);
> }
>
> static int xenfb_thread(void *data)
> {
> struct xenfb_info *info = data;
> unsigned long flags;
>
> while (!kthread_should_stop()) {
> spin_lock_irqsave(info->resize_lock, flags);
> if (info->resize_dpy)
> xenfb_resize_screen(info);
> spin_unlock_irqrestore(info->resize_lock, flags);
> [...]
> }
> [...]
> static int xenfb_set_par(struct fb_info *info)
> {
> struct xenfb_info *xenfb_info = info->par;
> unsigned long flags;
>
> spin_lock_irqsave(info->resize_lock, flags);
> info->var.xres_virtual = info->var.xres;
> info->var.yres_virtual = info->var.yres;
> xenfb_info->resize_dpy = 1;
> spin_unlock_irqrestore(info->resize_lock, flags);
>
> if (xenfb_info->kthread) {
> /* Wake up xenfb_thread() */
> xenfb_refresh(xenfb_info, INT_MAX, INT_MAX, 0, 0);
> }
> return 0;
> }
>
> Note that xenfb_set_par() can schedule resolution changes just fine
> before xenfb_thread() runs. It'll pick them up right when it starts.
>
> I used xenfb_refresh() to wake up xenfb_thread() only to keep things
> simple, not to express a preference for that method.
>
> Don't just copy my code sketch! Review it carefully, please.
>
>
>> -------------------
>> New lock comment
>>
>> /*
>> * There are three locks: spinlock resize_lock protecting resize_dpy,
>>
>
> It actually protects the screen size and resize_dpy.
>
>
>> * spinlock dirty_lock protecting the dirty rectangle and mutex
>> * mm_lock protecting mappings.
>> *
>> * resize_lock is used to synchronize resize_dpy access between
>> * xenfb_set_par() and xenfb_do_resize() running in xenfb_thread().
>> *
>> * How the dirty and mapping locks work together
>> *
>> ..........
>>
>>
>>
>>> I think you could fix the old code by protecting access to the shared
>>> resolution state by a spin lock.
>>>
>>> If I am missing something, and your new code is the way to go, you
>>> still need to migrate your explanation why it works from e-mail to
>>> source file, where the poor maintainer can find it.
>>>
>>> [...]
>>>
>>> Looks like this is the last issue that you haven't addressed /
>>> explained fully yet :)
>>>
>>>
>>>
>> Yahoo, getting close. Thanks
>>
>> Just an FYI, I am at Brainshare this week so my responses might be a
>> little slow but I will try to turn around any comments I receive as soon
>> as possible. Like to put this to bed before any more staging changes
>> take place.
>>
>
> Me too! And thanks for pushing this feature all the way.
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
I have attached front and back for your review. Back has not changed
except to include opengl changes. Front has synchronization fix. I
added a spin lock and struct xenfb_resize into struct xenfb. struct
xenfb_resize was added to protect the screen size values from changes
outside the driver. IE User application calls to ioctl(fb,
FBIOPUT_VSCREENINFO, &fb_var); while the driver is processing a previous
call.
diff -r 76c9cf11ce23 tools/ioemu/hw/xenfb.c
--- a/tools/ioemu/hw/xenfb.c Fri Mar 21 09:45:34 2008 +0000
+++ b/tools/ioemu/hw/xenfb.c Sun Mar 23 19:38:17 2008 -0600
@@ -516,6 +516,16 @@ static void xenfb_on_fb_event(struct xen
}
xenfb_guest_copy(xenfb, x, y, w, h);
break;
+ case XENFB_TYPE_RESIZE:
+ xenfb->width = event->resize.width;
+ xenfb->height = event->resize.height;
+ xenfb->row_stride = event->resize.stride;
+ dpy_colourdepth(xenfb->ds, xenfb->depth);
+ dpy_resize(xenfb->ds, xenfb->width, xenfb->height,
xenfb->row_stride);
+ if (xenfb->ds->shared_buf)
+ dpy_setdata(xenfb->ds, xenfb->pixels);
+ xenfb_invalidate(xenfb);
+ break;
}
}
xen_mb(); /* ensure we're done with ring contents */
@@ -680,6 +690,7 @@ static int xenfb_read_frontend_fb_config
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
+ int videoram;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
@@ -702,10 +713,30 @@ static int xenfb_read_frontend_fb_config
/* TODO check for consistency with the above */
xenfb->fb_len = fb_page->mem_length;
xenfb->row_stride = fb_page->line_length;
+
+ /* Protect against hostile frontend, limit fb_len to max allowed */
+ if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.nodename, "videoram", "%d",
+ &videoram) < 0)
+ videoram = 0;
+ videoram = videoram * 1024 * 1024;
+ if (videoram && xenfb->fb_len > videoram) {
+ fprintf(stderr, "Framebuffer requested length of %zd exceeded
allowed %d\n",
+ xenfb->fb_len, videoram);
+ xenfb->fb_len = videoram;
+ if (xenfb->row_stride * xenfb->height > xenfb->fb_len)
+ xenfb->height = xenfb->fb_len / xenfb->row_stride;
+ }
fprintf(stderr, "Framebuffer depth %d width %d height %d line %d\n",
fb_page->depth, fb_page->width, fb_page->height,
fb_page->line_length);
if (xenfb_map_fb(xenfb, xenfb->fb.otherend_id) < 0)
return -1;
+
+ /* Indicate we have the frame buffer resize feature */
+ xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "feature-resize", "1");
+
+ /* Tell kbd pointer the screen geometry */
+ xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "width", "%d",
xenfb->width);
+ xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "height", "%d",
xenfb->height);
if (xenfb_switch_state(&xenfb->fb, XenbusStateConnected))
return -1;
diff -r 76c9cf11ce23 tools/python/xen/xend/server/vfbif.py
--- a/tools/python/xen/xend/server/vfbif.py Fri Mar 21 09:45:34 2008 +0000
+++ b/tools/python/xen/xend/server/vfbif.py Sun Mar 23 08:08:09 2008 -0600
@@ -6,7 +6,7 @@ import os
import os
CONFIG_ENTRIES = ['type', 'vncdisplay', 'vnclisten', 'vncpasswd', 'vncunused',
- 'display', 'xauthority', 'keymap',
+ 'videoram', 'display', 'xauthority', 'keymap',
'uuid', 'location', 'protocol', 'opengl']
class VfbifController(DevController):
diff -r 76c9cf11ce23 tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py Fri Mar 21 09:45:34 2008 +0000
+++ b/tools/python/xen/xm/create.py Sun Mar 23 08:10:23 2008 -0600
@@ -500,6 +500,11 @@ gopts.var('vncunused', val='',
use="""Try to find an unused port for the VNC server.
Only valid when vnc=1.""")
+gopts.var('videoram', val='',
+ fn=set_value, default=None,
+ use="""Maximum amount of videoram PV guest can allocate
+ for frame buffer.""")
+
gopts.var('sdl', val='',
fn=set_value, default=None,
use="""Should the device model use SDL?""")
@@ -645,7 +650,8 @@ def configure_vfbs(config_devs, vals):
d['type'] = 'sdl'
for (k,v) in d.iteritems():
if not k in [ 'vnclisten', 'vncunused', 'vncdisplay', 'display',
- 'xauthority', 'type', 'vncpasswd', 'opengl' ]:
+ 'videoram', 'xauthority', 'type', 'vncpasswd',
+ 'opengl' ]:
err("configuration option %s unknown to vfbs" % k)
config.append([k,v])
if not d.has_key("keymap"):
diff -r 76c9cf11ce23 xen/include/public/io/fbif.h
--- a/xen/include/public/io/fbif.h Fri Mar 21 09:45:34 2008 +0000
+++ b/xen/include/public/io/fbif.h Sun Mar 23 08:05:53 2008 -0600
@@ -50,12 +50,28 @@ struct xenfb_update
int32_t height; /* rect height */
};
+/*
+ * Framebuffer resize notification event
+ * Capable backend sets feature-resize in xenstore.
+ */
+#define XENFB_TYPE_RESIZE 3
+
+struct xenfb_resize
+{
+ uint8_t type; /* XENFB_TYPE_RESIZE */
+ int32_t width; /* width in pixels */
+ int32_t height; /* height in pixels */
+ int32_t stride; /* stride in bytes */
+ int32_t depth; /* depth in bits */
+};
+
#define XENFB_OUT_EVENT_SIZE 40
union xenfb_out_event
{
uint8_t type;
struct xenfb_update update;
+ struct xenfb_resize resize;
char pad[XENFB_OUT_EVENT_SIZE];
};
@@ -109,15 +125,17 @@ struct xenfb_page
* Each directory page holds PAGE_SIZE / sizeof(*pd)
* framebuffer pages, and can thus map up to PAGE_SIZE *
* PAGE_SIZE / sizeof(*pd) bytes. With PAGE_SIZE == 4096 and
- * sizeof(unsigned long) == 4, that's 4 Megs. Two directory
- * pages should be enough for a while.
+ * sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2 Megs
+ * 64 bit. 256 directories give enough room for a 512 Meg
+ * framebuffer with a max resolution of 12,800x10,240. Should
+ * be enough for a while with room leftover for expansion.
*/
- unsigned long pd[2];
+ unsigned long pd[256];
};
/*
- * Wart: xenkbd needs to know resolution. Put it here until a better
- * solution is found, but don't leak it to the backend.
+ * Wart: xenkbd needs to know default resolution. Put it here until a
+ * better solution is found, but don't leak it to the backend.
*/
#ifdef __KERNEL__
#define XENFB_WIDTH 800
diff -r de57c3f218fb drivers/xen/fbfront/xenfb.c
--- a/drivers/xen/fbfront/xenfb.c Thu Mar 20 11:35:25 2008 +0000
+++ b/drivers/xen/fbfront/xenfb.c Sun Mar 23 19:52:17 2008 -0600
@@ -62,15 +62,21 @@ struct xenfb_info
struct xenfb_page *page;
unsigned long *mfns;
int update_wanted; /* XENFB_TYPE_UPDATE wanted */
+ int feature_resize; /* Backend has resize feature */
+ struct xenfb_resize resize;
+ int resize_dpy;
+ spinlock_t resize_lock;
struct xenbus_device *xbdev;
};
/*
- * How the locks work together
- *
- * There are two locks: spinlock dirty_lock protecting the dirty
- * rectangle, and mutex mm_lock protecting mappings.
+ * There are three locks:
+ * spinlock resize_lock protecting resize_dpy and screen size
+ * spinlock dirty_lock protecting the dirty rectangle
+ * mutex mm_lock protecting mappings.
+ *
+ * How the dirty and mapping locks work together
*
* The problem is that dirty rectangle and mappings aren't
* independent: the dirty rectangle must cover all faulted pages in
@@ -129,20 +135,41 @@ struct xenfb_info
*
* Oh well, we wont be updating the writes to this page anytime soon.
*/
+#define MB_ (1024*1024)
+#define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8)
+
+enum {KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT};
+static int video[KPARAM_CNT] = {2, XENFB_WIDTH, XENFB_HEIGHT};
+module_param_array(video, int, NULL, 0);
+MODULE_PARM_DESC(video,
+ "Size of video memory in MB and width,height in pixels, default
= (2,800,600)");
static int xenfb_fps = 20;
-static unsigned long xenfb_mem_len = XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH
/ 8;
static int xenfb_remove(struct xenbus_device *);
-static void xenfb_init_shared_page(struct xenfb_info *);
+static void xenfb_init_shared_page(struct xenfb_info *, struct fb_info *);
static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *);
static void xenfb_disconnect_backend(struct xenfb_info *);
+static void xenfb_send_event(struct xenfb_info *info,
+ union xenfb_out_event *event)
+{
+ __u32 prod;
+
+ prod = info->page->out_prod;
+ /* caller ensures !xenfb_queue_full() */
+ mb(); /* ensure ring space available */
+ XENFB_OUT_RING_REF(info->page, prod) = *event;
+ wmb(); /* ensure ring contents visible */
+ info->page->out_prod = prod + 1;
+
+ notify_remote_via_irq(info->irq);
+}
+
static void xenfb_do_update(struct xenfb_info *info,
int x, int y, int w, int h)
{
union xenfb_out_event event;
- __u32 prod;
event.type = XENFB_TYPE_UPDATE;
event.update.x = x;
@@ -150,14 +177,22 @@ static void xenfb_do_update(struct xenfb
event.update.width = w;
event.update.height = h;
- prod = info->page->out_prod;
/* caller ensures !xenfb_queue_full() */
- mb(); /* ensure ring space available */
- XENFB_OUT_RING_REF(info->page, prod) = event;
- wmb(); /* ensure ring contents visible */
- info->page->out_prod = prod + 1;
-
- notify_remote_via_irq(info->irq);
+ xenfb_send_event(info, &event);
+}
+
+static void xenfb_do_resize(struct xenfb_info *info)
+{
+ union xenfb_out_event event;
+
+ event.type = XENFB_TYPE_RESIZE;
+ event.resize.width = info->resize.width;
+ event.resize.height = info->resize.height;
+ event.resize.stride = info->resize.stride;
+ event.resize.depth = info->resize.depth;
+
+ /* caller ensures !xenfb_queue_full() */
+ xenfb_send_event(info, &event);
}
static int xenfb_queue_full(struct xenfb_info *info)
@@ -209,11 +244,26 @@ static void xenfb_update_screen(struct x
xenfb_do_update(info, x1, y1, x2 - x1, y2 - y1);
}
+static void xenfb_handle_resize_dpy(struct xenfb_info *info)
+{
+ int flags;
+
+ spin_lock_irqsave(&info->resize_lock, flags);
+ if (info->resize_dpy) {
+ if (!xenfb_queue_full(info)) {
+ info->resize_dpy = 0;
+ xenfb_do_resize(info);
+ }
+ }
+ spin_unlock_irqrestore(&info->resize_lock, flags);
+}
+
static int xenfb_thread(void *data)
{
struct xenfb_info *info = data;
while (!kthread_should_stop()) {
+ xenfb_handle_resize_dpy(info);
if (info->dirty) {
info->dirty = 0;
xenfb_update_screen(info);
@@ -413,6 +463,55 @@ static int xenfb_mmap(struct fb_info *fb
return 0;
}
+static int
+xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct xenfb_info *xenfb_info;
+ int required_mem_len;
+
+ xenfb_info = info->par;
+
+ if (!xenfb_info->feature_resize) {
+ if (var->xres == video[KPARAM_WIDTH] &&
+ var->yres == video[KPARAM_HEIGHT] &&
+ var->bits_per_pixel == xenfb_info->page->depth) {
+ return 0;
+ }
+ return -EINVAL;
+ }
+
+ /* Can't resize past initial width and height */
+ if (var->xres > video[KPARAM_WIDTH] || var->yres > video[KPARAM_HEIGHT])
+ return -EINVAL;
+
+ required_mem_len = var->xres * var->yres * (xenfb_info->page->depth /
8);
+ if (var->bits_per_pixel == xenfb_info->page->depth &&
+ var->xres <= info->fix.line_length / (XENFB_DEPTH / 8) &&
+ required_mem_len <= info->fix.smem_len) {
+ var->xres_virtual = var->xres;
+ var->yres_virtual = var->yres;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int xenfb_set_par(struct fb_info *info)
+{
+ struct xenfb_info *xenfb_info;
+ unsigned long flags;
+
+ xenfb_info = info->par;
+
+ spin_lock_irqsave(&xenfb_info->resize_lock, flags);
+ xenfb_info->resize.width = info->var.xres;
+ xenfb_info->resize.height = info->var.yres;
+ xenfb_info->resize.stride = info->fix.line_length;
+ xenfb_info->resize.depth = info->var.bits_per_pixel;
+ xenfb_info->resize_dpy = 1;
+ spin_unlock_irqrestore(&xenfb_info->resize_lock, flags);
+ return 0;
+}
+
static struct fb_ops xenfb_fb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = xenfb_setcolreg,
@@ -420,6 +519,8 @@ static struct fb_ops xenfb_fb_ops = {
.fb_copyarea = xenfb_copyarea,
.fb_imageblit = xenfb_imageblit,
.fb_mmap = xenfb_mmap,
+ .fb_check_var = xenfb_check_var,
+ .fb_set_par = xenfb_set_par,
};
static irqreturn_t xenfb_event_handler(int rq, void *dev_id,
@@ -450,6 +551,8 @@ static int __devinit xenfb_probe(struct
{
struct xenfb_info *info;
struct fb_info *fb_info;
+ int fb_size;
+ int val;
int ret;
info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -457,11 +560,27 @@ static int __devinit xenfb_probe(struct
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
return -ENOMEM;
}
+
+ /* Limit kernel param videoram amount to what is in xenstore */
+ if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) {
+ if (val < video[KPARAM_MEM])
+ video[KPARAM_MEM] = val;
+ }
+
+ /* If requested res does not fit in available memory, use default */
+ fb_size = video[KPARAM_MEM] * MB_;
+ if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH/8 >
fb_size) {
+ video[KPARAM_WIDTH] = XENFB_WIDTH;
+ video[KPARAM_HEIGHT] = XENFB_HEIGHT;
+ fb_size = XENFB_DEFAULT_FB_LEN;
+ }
+
dev->dev.driver_data = info;
info->xbdev = dev;
info->irq = -1;
info->x1 = info->y1 = INT_MAX;
spin_lock_init(&info->dirty_lock);
+ spin_lock_init(&info->resize_lock);
mutex_init(&info->mm_lock);
init_waitqueue_head(&info->wq);
init_timer(&info->refresh);
@@ -469,12 +588,12 @@ static int __devinit xenfb_probe(struct
info->refresh.data = (unsigned long)info;
INIT_LIST_HEAD(&info->mappings);
- info->fb = vmalloc(xenfb_mem_len);
+ info->fb = vmalloc(fb_size);
if (info->fb == NULL)
goto error_nomem;
- memset(info->fb, 0, xenfb_mem_len);
-
- info->nr_pages = (xenfb_mem_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ memset(info->fb, 0, fb_size);
+
+ info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
info->pages = kmalloc(sizeof(struct page *) * info->nr_pages,
GFP_KERNEL);
@@ -489,8 +608,6 @@ static int __devinit xenfb_probe(struct
info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
if (!info->page)
goto error_nomem;
-
- xenfb_init_shared_page(info);
fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL);
/* see fishy hackery below */
@@ -504,9 +621,9 @@ static int __devinit xenfb_probe(struct
fb_info->screen_base = info->fb;
fb_info->fbops = &xenfb_fb_ops;
- fb_info->var.xres_virtual = fb_info->var.xres = info->page->width;
- fb_info->var.yres_virtual = fb_info->var.yres = info->page->height;
- fb_info->var.bits_per_pixel = info->page->depth;
+ fb_info->var.xres_virtual = fb_info->var.xres = video[KPARAM_WIDTH];
+ fb_info->var.yres_virtual = fb_info->var.yres = video[KPARAM_HEIGHT];
+ fb_info->var.bits_per_pixel = XENFB_DEPTH;
fb_info->var.red = (struct fb_bitfield){16, 8, 0};
fb_info->var.green = (struct fb_bitfield){8, 8, 0};
@@ -518,9 +635,9 @@ static int __devinit xenfb_probe(struct
fb_info->var.vmode = FB_VMODE_NONINTERLACED;
fb_info->fix.visual = FB_VISUAL_TRUECOLOR;
- fb_info->fix.line_length = info->page->line_length;
+ fb_info->fix.line_length = fb_info->var.xres * (XENFB_DEPTH / 8);
fb_info->fix.smem_start = 0;
- fb_info->fix.smem_len = xenfb_mem_len;
+ fb_info->fix.smem_len = fb_size;
strcpy(fb_info->fix.id, "xen");
fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
fb_info->fix.accel = FB_ACCEL_NONE;
@@ -533,6 +650,8 @@ static int __devinit xenfb_probe(struct
xenbus_dev_fatal(dev, ret, "fb_alloc_cmap");
goto error;
}
+
+ xenfb_init_shared_page(info, fb_info);
ret = register_framebuffer(fb_info);
if (ret) {
@@ -571,7 +690,7 @@ static int xenfb_resume(struct xenbus_de
struct xenfb_info *info = dev->dev.driver_data;
xenfb_disconnect_backend(info);
- xenfb_init_shared_page(info);
+ xenfb_init_shared_page(info, info->fb_info);
return xenfb_connect_backend(dev, info);
}
@@ -597,9 +716,11 @@ static int xenfb_remove(struct xenbus_de
return 0;
}
-static void xenfb_init_shared_page(struct xenfb_info *info)
+static void xenfb_init_shared_page(struct xenfb_info *info,
+ struct fb_info * fb_info)
{
int i;
+ int epd = PAGE_SIZE / sizeof(info->mfns[0]);
for (i = 0; i < info->nr_pages; i++)
info->pages[i] = vmalloc_to_page(info->fb + i * PAGE_SIZE);
@@ -607,13 +728,14 @@ static void xenfb_init_shared_page(struc
for (i = 0; i < info->nr_pages; i++)
info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE);
- info->page->pd[0] = vmalloc_to_mfn(info->mfns);
- info->page->pd[1] = 0;
- info->page->width = XENFB_WIDTH;
- info->page->height = XENFB_HEIGHT;
- info->page->depth = XENFB_DEPTH;
- info->page->line_length = (info->page->depth / 8) * info->page->width;
- info->page->mem_length = xenfb_mem_len;
+ for (i = 0; i * epd < info->nr_pages; i++)
+ info->page->pd[i] = vmalloc_to_mfn(&info->mfns[i * epd]);
+
+ info->page->width = fb_info->var.xres;
+ info->page->height = fb_info->var.yres;
+ info->page->depth = fb_info->var.bits_per_pixel;
+ info->page->line_length = fb_info->fix.line_length;
+ info->page->mem_length = fb_info->fix.smem_len;
info->page->in_cons = info->page->in_prod = 0;
info->page->out_cons = info->page->out_prod = 0;
}
@@ -712,6 +834,11 @@ static void xenfb_backend_changed(struct
val = 0;
if (val)
info->update_wanted = 1;
+
+ if (xenbus_scanf(XBT_NIL, dev->otherend,
+ "feature-resize", "%d", &val) < 0)
+ val = 0;
+ info->feature_resize = val;
break;
case XenbusStateClosing:
diff -r de57c3f218fb drivers/xen/fbfront/xenkbd.c
--- a/drivers/xen/fbfront/xenkbd.c Thu Mar 20 11:35:25 2008 +0000
+++ b/drivers/xen/fbfront/xenkbd.c Sun Mar 23 08:04:40 2008 -0600
@@ -297,6 +297,16 @@ static void xenkbd_backend_changed(struc
*/
if (dev->state != XenbusStateConnected)
goto InitWait; /* no InitWait seen yet, fudge it */
+
+ /* Set input abs params to match backend screen res */
+ if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "width", "%d", &val) > 0 )
+ input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
+
+ if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "height", "%d", &val) > 0 )
+ input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
+
break;
case XenbusStateClosing:
diff -r de57c3f218fb include/xen/interface/io/fbif.h
--- a/include/xen/interface/io/fbif.h Thu Mar 20 11:35:25 2008 +0000
+++ b/include/xen/interface/io/fbif.h Sun Mar 23 08:04:40 2008 -0600
@@ -50,12 +50,28 @@ struct xenfb_update
int32_t height; /* rect height */
};
+/*
+ * Framebuffer resize notification event
+ * Capable backend sets feature-resize in xenstore.
+ */
+#define XENFB_TYPE_RESIZE 3
+
+struct xenfb_resize
+{
+ uint8_t type; /* XENFB_TYPE_RESIZE */
+ int32_t width; /* width in pixels */
+ int32_t height; /* height in pixels */
+ int32_t stride; /* stride in bytes */
+ int32_t depth; /* depth in bits */
+};
+
#define XENFB_OUT_EVENT_SIZE 40
union xenfb_out_event
{
uint8_t type;
struct xenfb_update update;
+ struct xenfb_resize resize;
char pad[XENFB_OUT_EVENT_SIZE];
};
@@ -109,15 +125,17 @@ struct xenfb_page
* Each directory page holds PAGE_SIZE / sizeof(*pd)
* framebuffer pages, and can thus map up to PAGE_SIZE *
* PAGE_SIZE / sizeof(*pd) bytes. With PAGE_SIZE == 4096 and
- * sizeof(unsigned long) == 4, that's 4 Megs. Two directory
- * pages should be enough for a while.
+ * sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2 Megs
+ * 64 bit. 256 directories give enough room for a 512 Meg
+ * framebuffer with a max resolution of 12,800x10,240. Should
+ * be enough for a while with room leftover for expansion.
*/
- unsigned long pd[2];
+ unsigned long pd[256];
};
/*
- * Wart: xenkbd needs to know resolution. Put it here until a better
- * solution is found, but don't leak it to the backend.
+ * Wart: xenkbd needs to know default resolution. Put it here until a
+ * better solution is found, but don't leak it to the backend.
*/
#ifdef __KERNEL__
#define XENFB_WIDTH 800
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