"Christian Limpach" <christian.limpach@xxxxxxxxx> writes:
> On 6/26/06, Markus Armbruster <armbru@xxxxxxxxxx> wrote:
>> Derived from
>> http://www.cs.utexas.edu/users/aliguori/vfb-20060124.bundle
>>
>> Converted to Xenstore and ported to current kernels.
>
> This looks good.
>
> Could you address the following issues:
>
> - the patch which defined struct xenfb_page seems to be missing
This time it's included.
> - handling of the ring indexes:
> + we generally prefer to store ring indexes in their unmasked form,
> it makes debugging easier and it allows the ring to be used to its
> full capacity instead of requiring leaving one slot empty to be able
> distinguish empty/full
Done.
> + unless I misread the code, the producer (for frontend to backend
> messages) seems to write to out_prod + 1 > out_cons, then increment
> out_prob (xenfb_do_update) and then the consumer processes entries
> from out_cons upto but not include the updated out_prod
> (xenfb_on_fb_event) -- the producer for the other way around (backend
> to frontend, xenfb_fb_event) seems to be correcter.
The old code confused me. I guess my ring index change takes care of
this one, too.
> + the lack of barriers -- /* FIXME barriers */ doesn't really cut it ;-)
> ==> I would suggest looking at the block or net frontend/backend
> drivers and copy/pasting some code from there...
Found only read barriers in block fe/be. console has read and write
barriers. Now I'm confused. I added read barriers and documented my
confusion.
> - xenbus transactions can fail and there's no code to retry failed
> transactions
Done.
> Additionally, I think that the dirty region protocol doesn't really
> perform too well in quite simple usage cases like having video play in
> one corner of the screen and the mouse being moved in the opposite
> corner. It's probably good enough for this version and supporting
> this protocol in the future isn't too bad.
Saved for later.
> I'm looking forward to seeing a new version of this patch, thanks!
>
> christian
Here you go :)
diff -r d8434a6fdd05 arch/i386/kernel/setup-xen.c
--- a/arch/i386/kernel/setup-xen.c Fri Jun 16 19:34:13 2006 +0200
+++ b/arch/i386/kernel/setup-xen.c Mon Jul 10 20:18:50 2006 +0200
@@ -1787,8 +1787,12 @@ void __init setup_arch(char **cmdline_p)
#endif
#endif
} else {
+#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+#else
extern int console_use_vt;
console_use_vt = 0;
+#endif
}
}
diff -r d8434a6fdd05 drivers/xen/Kconfig
--- a/drivers/xen/Kconfig Fri Jun 16 19:34:13 2006 +0200
+++ b/drivers/xen/Kconfig Mon Jul 10 20:18:50 2006 +0200
@@ -173,6 +173,29 @@ config XEN_BLKDEV_TAP
to a character device, allowing device prototyping in application
space. Odds are that you want to say N here.
+config XEN_FRAMEBUFFER
+ tristate "Framebuffer-device frontend driver"
+ depends on XEN && FB
+ select FB_CFB_FILLRECT
+ select FB_CFB_COPYAREA
+ select FB_CFB_IMAGEBLIT
+ default y
+ help
+ The framebuffer-device frontend drivers allows the kernel to create a
+ virtual framebuffer. This framebuffer can be viewed in another
+ domain. Unless this domain has access to a real video card, you
+ probably want to say Y here.
+
+config XEN_KEYBOARD
+ tristate "Keyboard-device frontend driver"
+ depends on XEN
+ default y
+ help
+ The keyboard-device frontend driver allows the kernel to create a
+ virtual keyboard. This keyboard can then be driven by another
+ domain. If you've said Y to CONFIG_XEN_FRAMEBUFFER, you probably
+ want to say Y here.
+
config XEN_SCRUB_PAGES
bool "Scrub memory before freeing it to Xen"
default y
diff -r d8434a6fdd05 drivers/xen/Makefile
--- a/drivers/xen/Makefile Fri Jun 16 19:34:13 2006 +0200
+++ b/drivers/xen/Makefile Mon Jul 10 20:18:50 2006 +0200
@@ -15,3 +15,5 @@ obj-$(CONFIG_XEN_BLKDEV_TAP) += blkt
obj-$(CONFIG_XEN_BLKDEV_TAP) += blktap/
obj-$(CONFIG_XEN_PCIDEV_BACKEND) += pciback/
obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += pcifront/
+obj-$(CONFIG_XEN_FRAMEBUFFER) += xenfb/
+obj-$(CONFIG_XEN_KEYBOARD) += xenkbd/
diff -r d8434a6fdd05 drivers/xen/xenfb/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/xenfb/Makefile Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,1 @@
+obj-$(CONFIG_XEN_FRAMEBUFFER) := xenfb.o
diff -r d8434a6fdd05 drivers/xen/xenfb/xenfb.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/xenfb/xenfb.c Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,565 @@
+/*
+ * linux/drivers/video/xenfb.c -- Xen para-virtual frame buffer device
+ *
+ * Copyright (C) 2005-2006
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * Based on linux/drivers/video/q40fb.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <asm/hypervisor.h>
+#include <xen/evtchn.h>
+#include <xen/xenbus.h>
+#include <linux/xenfb.h>
+#include <linux/kthread.h>
+
+static int xenfb_fps = 20;
+static unsigned long xenfb_mem_len = 2 * 1024 * 1024;
+
+struct xenfb_mapping
+{
+ struct list_head next;
+ struct vm_area_struct *vma;
+ atomic_t map_refs;
+ int faults;
+ struct xenfb_info *info;
+};
+
+struct xenfb_info
+{
+ struct task_struct *kthread;
+ wait_queue_head_t wq;
+
+ unsigned char *fb;
+ struct fb_fix_screeninfo *fix;
+ struct fb_var_screeninfo *var;
+ struct fb_info *fb_info;
+ struct timer_list refresh;
+ int dirty;
+ int y1, y2;
+ int x1, x2;
+
+ struct semaphore mm_lock;
+ int nr_pages;
+ struct page **pages;
+ struct list_head mappings;
+
+ unsigned evtchn;
+ struct xenfb_page *page;
+ unsigned long *mfns;
+};
+
+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;
+ event.update.y = y;
+ event.update.width = w;
+ event.update.height = h;
+
+ prod = info->page->out_prod;
+ if (prod - info->page->out_cons == XENFB_RING_SIZE(info->page->out))
+ return; /* ring buffer full, event lost */
+ XENFB_RING_REF(info->page->out, prod) = event;
+ info->page->out_prod = prod + 1;
+
+ notify_remote_via_evtchn(info->evtchn);
+}
+
+static int xenfb_queue_full(struct xenfb_info *info)
+{
+ __u32 cons, prod;
+
+ prod = info->page->out_prod;
+ cons = info->page->out_cons;
+ return prod - cons == XENFB_RING_SIZE(info->page->out);
+}
+
+static void xenfb_update_screen(struct xenfb_info *info)
+{
+ int y1, y2, x1, x2;
+ struct list_head *item;
+ struct xenfb_mapping *map;
+
+ if (xenfb_queue_full(info))
+ return;
+
+ y1 = info->y1;
+ y2 = info->y2;
+ x1 = info->x1;
+ x2 = info->x2;
+ info->dirty = info->y1 = info->y2 = info->x1 = info->x2 = 0;
+ down(&info->mm_lock);
+ list_for_each(item, &info->mappings) {
+ map = list_entry(item, struct xenfb_mapping, next);
+ if (!map->faults)
+ continue;
+ zap_page_range(map->vma, map->vma->vm_start,
+ map->vma->vm_end - map->vma->vm_start, NULL);
+ map->faults = 0;
+ }
+ up(&info->mm_lock);
+
+ xenfb_do_update(info, x1, y1, x2 - x1, y2 - y1);
+}
+
+static int xenfb_thread(void *data)
+{
+ struct xenfb_info *info = data;
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue(&info->wq, &wait);
+ for (;;) {
+ if (kthread_should_stop())
+ break;
+ if (info->dirty)
+ xenfb_update_screen(info);
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
+ remove_wait_queue(&info->wq, &wait);
+ return 0;
+}
+
+static int xenfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ u32 v;
+
+ if (regno > info->cmap.len)
+ return 1;
+
+ red >>= (16 - info->var.red.length);
+ green >>= (16 - info->var.green.length);
+ blue >>= (16 - info->var.blue.length);
+
+ v = (red << info->var.red.offset) |
+ (green << info->var.green.offset) |
+ (blue << info->var.blue.offset);
+
+ switch (info->var.bits_per_pixel) {
+ case 16:
+ case 24:
+ case 32:
+ ((u32 *)info->pseudo_palette)[regno] = v;
+ break;
+ }
+
+ return 0;
+}
+
+static void xenfb_timer(unsigned long data)
+{
+ struct xenfb_info *info = (struct xenfb_info *)data;
+ info->dirty++;
+ wake_up(&info->wq);
+}
+
+static void xenfb_refresh(struct xenfb_info *info,
+ int x1, int y1, int w, int h)
+{
+ int y2, x2;
+
+ y2 = y1 + h;
+ x2 = x1 + w;
+ if (info->y2 == 0) {
+ info->y1 = y1;
+ info->y2 = y2;
+ }
+ if (info->x2 == 0) {
+ info->x1 = x1;
+ info->x2 = x2;
+ }
+
+ if (info->y1 > y1)
+ info->y1 = y1;
+ if (info->y2 < y2)
+ info->y2 = y2;
+ if (info->x1 > x1)
+ info->x1 = x1;
+ if (info->x2 < x2)
+ info->x2 = x2;
+
+ if (timer_pending(&info->refresh))
+ return;
+
+ mod_timer(&info->refresh, jiffies + HZ/xenfb_fps);
+}
+
+static void xenfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
+{
+ struct xenfb_info *info = p->par;
+
+ cfb_fillrect(p, rect);
+ xenfb_refresh(info, rect->dx, rect->dy, rect->width, rect->height);
+}
+
+static void xenfb_imageblit(struct fb_info *p, const struct fb_image *image)
+{
+ struct xenfb_info *info = p->par;
+
+ cfb_imageblit(p, image);
+ xenfb_refresh(info, image->dx, image->dy, image->width, image->height);
+}
+
+static void xenfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
+{
+ struct xenfb_info *info = p->par;
+
+ cfb_copyarea(p, area);
+ xenfb_refresh(info, area->dx, area->dy, area->width, area->height);
+}
+
+static void xenfb_vm_open(struct vm_area_struct *vma)
+{
+ struct xenfb_mapping *map = vma->vm_private_data;
+ atomic_inc(&map->map_refs);
+}
+
+static void xenfb_vm_close(struct vm_area_struct *vma)
+{
+ struct xenfb_mapping *map = vma->vm_private_data;
+ struct xenfb_info *info = map->info;
+
+ down(&info->mm_lock);
+ if (atomic_dec_and_test(&map->map_refs)) {
+ list_del(&map->next);
+ kfree(map);
+ }
+ up(&info->mm_lock);
+}
+
+static struct page *xenfb_vm_nopage(struct vm_area_struct *vma,
+ unsigned long vaddr, int *type)
+{
+ struct xenfb_mapping *map = vma->vm_private_data;
+ struct xenfb_info *info = map->info;
+ int pgnr = (vaddr - vma->vm_start) >> PAGE_SHIFT;
+ struct page *page;
+ int y1, y2;
+
+ if (pgnr >= info->nr_pages)
+ return NOPAGE_SIGBUS;
+
+ down(&info->mm_lock);
+ page = info->pages[pgnr];
+ get_page(page);
+ map->faults++;
+
+ y1 = pgnr * PAGE_SIZE / info->fix->line_length;
+ y2 = (pgnr * PAGE_SIZE + PAGE_SIZE - 1) / info->fix->line_length;
+ if (y2 > info->var->yres)
+ y2 = info->var->yres;
+ xenfb_refresh(info, 0, y1, info->var->xres, y2 - y1);
+ up(&info->mm_lock);
+
+ if (type)
+ *type = VM_FAULT_MINOR;
+
+ return page;
+}
+
+static struct vm_operations_struct xenfb_vm_ops = {
+ .open = xenfb_vm_open,
+ .close = xenfb_vm_close,
+ .nopage = xenfb_vm_nopage,
+};
+
+static int xenfb_mmap(struct fb_info *fb_info, struct vm_area_struct *vma)
+{
+ struct xenfb_info *info = fb_info->par;
+ struct xenfb_mapping *map;
+ int ret;
+ int map_pages;
+
+ down(&info->mm_lock);
+
+ ret = -EINVAL;
+ if (!(vma->vm_flags & VM_WRITE))
+ goto out;
+ if (!(vma->vm_flags & VM_SHARED))
+ goto out;
+ if (vma->vm_pgoff != 0)
+ goto out;
+
+ map_pages = (vma->vm_end - vma->vm_start + PAGE_SIZE-1) >> PAGE_SHIFT;
+ if (map_pages > info->nr_pages)
+ goto out;
+
+ ret = -ENOMEM;
+ map = kmalloc(sizeof(*map), GFP_KERNEL);
+ if (map == NULL)
+ goto out;
+ memset(map, 0, sizeof(*map));
+
+ map->vma = vma;
+ map->faults = 0;
+ map->info = info;
+ atomic_set(&map->map_refs, 1);
+ list_add(&map->next, &info->mappings);
+ vma->vm_ops = &xenfb_vm_ops;
+ vma->vm_flags |= (VM_DONTEXPAND | VM_RESERVED);
+ vma->vm_private_data = map;
+ ret = 0;
+
+ out:
+ up(&info->mm_lock);
+ return ret;
+}
+
+static struct fb_ops xenfb_fb_ops = {
+ .owner = THIS_MODULE,
+ .fb_setcolreg = xenfb_setcolreg,
+ .fb_fillrect = xenfb_fillrect,
+ .fb_copyarea = xenfb_copyarea,
+ .fb_imageblit = xenfb_imageblit,
+ .fb_mmap = xenfb_mmap,
+};
+
+static irqreturn_t xenfb_event_handler(int rq, void *dev_id,
+ struct pt_regs *regs)
+{
+ struct xenfb_info *info = dev_id;
+ __u32 cons, prod;
+
+ if (!info->page || !info->page->initialized)
+ return IRQ_NONE;
+
+ prod = info->page->in_prod;
+ rmb(); /* ensure we see ring contents up to prod */
+ for (cons = info->page->in_cons; cons != prod; cons++) {
+ union xenfb_in_event *event;
+ event = &XENFB_RING_REF(info->page->in, cons);
+ notify_remote_via_evtchn(info->evtchn);
+ }
+ /* FIXME do I need a wmb() here? */
+ info->page->in_cons = cons;
+
+ return IRQ_HANDLED;
+}
+
+static unsigned long vmalloc_to_mfn(void *address)
+{
+ return pfn_to_mfn(vmalloc_to_pfn(address));
+}
+
+static struct xenfb_info *xenfb_info;
+static int xenfb_irq;
+
+static int __init xenfb_probe(void)
+{
+ struct xenfb_info *info;
+ int i, ret;
+ struct fb_info *fb_info;
+ struct evtchn_alloc_unbound alloc_unbound;
+ xenbus_transaction_t xbt;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL)
+ return -ENOMEM;
+ memset(info, 0, sizeof(*info));
+
+ INIT_LIST_HEAD(&info->mappings);
+
+ info->fb = vmalloc(xenfb_mem_len);
+ if (info->fb == NULL)
+ goto error;
+ memset(info->fb, 0, xenfb_mem_len);
+ info->nr_pages = (xenfb_mem_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ info->pages = kmalloc(sizeof(struct page*)*info->nr_pages, GFP_KERNEL);
+ if (info->pages == NULL)
+ goto error_vfree;
+ for (i = 0; i < info->nr_pages; i++)
+ info->pages[i] = vmalloc_to_page(info->fb + i * PAGE_SIZE);
+
+ fb_info = framebuffer_alloc(sizeof(u32) * 256, NULL);
+ if (fb_info == NULL)
+ goto error_kfree;
+
+ info->mfns = vmalloc(sizeof(unsigned long) * info->nr_pages);
+ /* set up shared page */
+ info->page = (void *)__get_free_page(GFP_KERNEL);
+ if (!info->page)
+ goto error_kfree;
+ /* set up event channel */
+ alloc_unbound.dom = DOMID_SELF;
+ alloc_unbound.remote_dom = 0;
+ ret = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
+ &alloc_unbound);
+ if (ret)
+ goto error_freep;
+ info->evtchn = alloc_unbound.port;
+
+ 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->width = 800;
+ info->page->height = 600;
+ info->page->depth = 32;
+ info->page->line_length = (info->page->depth / 8) * info->page->width;
+ info->page->mem_length = xenfb_mem_len;
+
+ ret = bind_evtchn_to_irqhandler(info->evtchn, xenfb_event_handler,
+ 0, "xenfb", info);
+ if (ret < 0)
+ // FIXME need to close evtchn?
+ goto error_kfree;
+
+ xenfb_irq = ret;
+ xenfb_info = info;
+
+ fb_info->pseudo_palette = fb_info->par;
+ fb_info->par = info;
+ fb_info->screen_base = info->fb;
+
+ memset(&fb_info->var, 0, sizeof(fb_info->var));
+ memset(&fb_info->fix, 0, sizeof(fb_info->fix));
+
+ 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.red = (struct fb_bitfield){16, 8, 0};
+ fb_info->var.green = (struct fb_bitfield){8, 8, 0};
+ fb_info->var.blue = (struct fb_bitfield){0, 8, 0};
+
+ fb_info->var.activate = FB_ACTIVATE_NOW;
+ fb_info->var.height = -1;
+ fb_info->var.width = -1;
+ 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.smem_start = 0;
+ fb_info->fix.smem_len = xenfb_mem_len;
+ strcpy(fb_info->fix.id, "xen");
+ fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
+ fb_info->fix.accel = FB_ACCEL_NONE;
+
+ fb_info->flags = FBINFO_FLAG_DEFAULT;
+
+ fb_alloc_cmap(&fb_info->cmap, 256, 0);
+
+ info->fb_info = fb_info;
+ info->fix = &fb_info->fix;
+ info->var = &fb_info->var;
+
+ init_MUTEX(&info->mm_lock);
+ init_waitqueue_head(&info->wq);
+ init_timer(&info->refresh);
+ info->refresh.function = xenfb_timer;
+ info->refresh.data = (unsigned long)info;
+
+ info->kthread = kthread_run(xenfb_thread, info, "xenfb thread");
+
+ ret = register_framebuffer(fb_info);
+ if (ret)
+ goto error_unbind;
+
+ again:
+ ret = xenbus_transaction_start(&xbt);
+ if (ret)
+ goto error_unreg;
+ ret = xenbus_printf(xbt, "vfb", "page-ref", "%lu",
+ virt_to_mfn(info->page));
+ if (ret)
+ goto error_xenbus;
+ ret = xenbus_printf(xbt, "vfb", "event-channel", "%u",
+ info->evtchn);
+ if (ret)
+ goto error_xenbus;
+ ret = xenbus_transaction_end(xbt, 0);
+ if (ret) {
+ if (ret == -EAGAIN)
+ goto again;
+ goto error_unreg;
+ }
+
+ info->page->initialized = 1; /* FIXME needed? move up? */
+
+ return 0;
+
+ error_xenbus:
+ xenbus_transaction_end(xbt, 1);
+ error_unreg:
+ unregister_framebuffer(fb_info);
+ error_unbind:
+ unbind_from_irqhandler(xenfb_irq, info);
+ xenfb_irq = 0;
+ error_freep:
+ free_page((unsigned long)info->page);
+ error_kfree:
+ kfree(info->pages);
+ error_vfree:
+ vfree(info->fb);
+ error:
+ kfree(info);
+ xenfb_info = NULL;
+
+ return -ENODEV;
+}
+
+void xenfb_resume(void)
+{
+#if 0 /* FIXME */
+ int i, ret;
+
+ xenfb_info->page = mfn_to_virt(xen_start_info->fbdev_mfn);
+ for (i = 0; i < xenfb_info->nr_pages; i++)
+ xenfb_info->mfns[i] = vmalloc_to_mfn(xenfb_info->fb + i *
PAGE_SIZE);
+ xenfb_info->page->pd[0] = vmalloc_to_mfn(xenfb_info->mfns);
+
+ if (xenfb_irq)
+ unbind_from_irqhandler(xenfb_irq, NULL);
+
+ printk("xenfb: resume(%d)\n", xen_start_info->fbdev_evtchn);
+ ret = bind_evtchn_to_irqhandler(xen_start_info->fbdev_evtchn,
+ xenfb_event_handler, 0, "xenfb",
xenfb_info);
+ if (ret <= 0)
+ return;
+ xenfb_irq = ret;
+#else
+ printk(KERN_DEBUG "xenfb_resume not implemented\n");
+#endif
+}
+
+static int __init xenfb_init(void)
+{
+ return xenfb_probe();
+}
+
+static void __exit xenfb_cleanup(void)
+{
+ struct xenfb_info *info = xenfb_info;
+
+ unregister_framebuffer(info->fb_info);
+ unbind_from_irqhandler(xenfb_irq, info);
+ xenfb_irq = 0;
+ free_page((unsigned long)info->page);
+ kfree(info->pages);
+ vfree(info->fb);
+ kfree(info);
+ xenfb_info = NULL;
+}
+
+module_init(xenfb_init);
+module_exit(xenfb_cleanup);
+
+MODULE_LICENSE("GPL");
diff -r d8434a6fdd05 drivers/xen/xenkbd/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/xenkbd/Makefile Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,1 @@
+obj-$(CONFIG_XEN_KEYBOARD) += xenkbd.o
diff -r d8434a6fdd05 drivers/xen/xenkbd/xenkbd.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/xenkbd/xenkbd.c Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,205 @@
+/*
+ * linux/drivers/input/keyboard/xenkbd.c -- Xen para-virtual input device
+ *
+ * Copyright (C) 2005
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * Based on linux/drivers/input/mouse/sermouse.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <asm/hypervisor.h>
+#include <xen/evtchn.h>
+#include <xen/xenbus.h>
+#include <linux/xenkbd.h>
+
+struct xenkbd_device
+{
+ struct input_dev *dev;
+ struct xenkbd_info *info;
+ unsigned evtchn;
+};
+
+static irqreturn_t input_handler(int rq, void *dev_id, struct pt_regs *regs)
+{
+ struct xenkbd_device *dev = dev_id;
+ struct xenkbd_info *info = dev ? dev->info : 0;
+ static int button_map[3] = { BTN_RIGHT, BTN_MIDDLE, BTN_LEFT };
+ __u32 cons, prod;
+
+ if (!info || !info->initialized)
+ return IRQ_NONE;
+
+ prod = info->in_prod;
+ rmb(); /* ensure we see ring contents up to prod */
+ for (cons = info->in_cons; cons != prod; cons++) {
+ union xenkbd_in_event *event;
+ event = &XENKBD_RING_REF(info->in, cons);
+
+ switch (event->type) {
+ case XENKBD_TYPE_MOTION:
+ input_report_rel(dev->dev, REL_X, event->motion.rel_x);
+ input_report_rel(dev->dev, REL_Y, event->motion.rel_y);
+ break;
+ case XENKBD_TYPE_BUTTON:
+ if (event->button.button < 3)
+ input_report_key(dev->dev,
+
button_map[event->button.button],
+ event->button.pressed);
+ break;
+ case XENKBD_TYPE_KEY:
+ input_report_key(dev->dev, event->key.keycode,
event->key.pressed);
+ break;
+ }
+
+ notify_remote_via_evtchn(dev->evtchn);
+ }
+ input_sync(dev->dev);
+ /* FIXME do I need a wmb() here? */
+ info->in_cons = cons;
+
+ return IRQ_HANDLED;
+}
+
+static struct xenkbd_device *xenkbd_dev;
+static int xenkbd_irq;
+
+int __init xenkbd_init(void)
+{
+ int ret = 0;
+ int i;
+ struct xenkbd_device *dev;
+ struct input_dev *input_dev;
+ struct evtchn_alloc_unbound alloc_unbound;
+ xenbus_transaction_t xbt;
+
+ dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!dev || !input_dev)
+ return -ENOMEM;
+
+ dev->dev = input_dev;
+ dev->info = (void *)__get_free_page(GFP_KERNEL);
+ if (!dev->info) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ dev->info->initialized = 0;
+
+ alloc_unbound.dom = DOMID_SELF;
+ alloc_unbound.remote_dom = 0;
+ ret = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
+ &alloc_unbound);
+ if (ret)
+ goto error_freep;
+ dev->evtchn = alloc_unbound.port;
+ ret = bind_evtchn_to_irqhandler(dev->evtchn, input_handler, 0,
+ "xenkbd", dev);
+ if (ret < 0)
+ goto error_freep;
+
+ xenkbd_irq = ret;
+
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
+ input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);
+ input_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
+
+ /* FIXME not sure this is quite right */
+ for (i = 0; i < 256; i++)
+ set_bit(i, input_dev->keybit);
+
+ input_dev->name = "Xen Virtual Keyboard/Mouse";
+
+ input_register_device(input_dev);
+
+ again:
+ ret = xenbus_transaction_start(&xbt);
+ if (ret)
+ goto error_unreg;
+ ret = xenbus_printf(xbt, "vkbd", "page-ref", "%lu",
+ virt_to_mfn(dev->info));
+ if (ret)
+ goto error_xenbus;
+ ret = xenbus_printf(xbt, "vkbd", "event-channel", "%u",
+ dev->evtchn);
+ if (ret)
+ goto error_xenbus;
+ ret = xenbus_transaction_end(xbt, 0);
+ if (ret) {
+ if (ret == -EAGAIN)
+ goto again;
+ /* FIXME really retry forever? */
+ goto error_unreg;
+ }
+
+ dev->info->in_cons = dev->info->in_prod = 0;
+ dev->info->out_cons = dev->info->out_prod = 0;
+ dev->info->initialized = 1; /* FIXME needed? move up? */
+
+ xenkbd_dev = dev;
+
+ return ret;
+
+
+ error_xenbus:
+ xenbus_transaction_end(xbt, 1);
+ error_unreg:
+ input_unregister_device(input_dev);
+ unbind_from_irqhandler(xenkbd_irq, dev);
+ xenkbd_irq = 0;
+ error_freep:
+ free_page((unsigned long)dev->info);
+ error:
+ kfree(dev);
+ xenkbd_dev = NULL;
+ return ret;
+}
+
+static void __exit xenkbd_cleanup(void)
+{
+ input_unregister_device(xenkbd_dev->dev);
+ unbind_from_irqhandler(xenkbd_irq, xenkbd_dev);
+ xenkbd_irq = 0;
+ free_page((unsigned long)xenkbd_dev->info);
+ kfree(xenkbd_dev);
+ xenkbd_dev = NULL;
+}
+
+void xenkbd_resume(void)
+{
+#if 0 /* FIXME */
+ int ret;
+
+ if (xenkbd_dev && xen_start_info->kbd_evtchn) {
+ if (xenkbd_irq)
+ unbind_from_irqhandler(xenkbd_irq, NULL);
+
+ ret = bind_evtchn_to_irqhandler(xen_start_info->kbd_evtchn,
+ input_handler,
+ 0,
+ "xenkbd",
+ xenkbd_dev);
+
+ if (ret <= 0)
+ return;
+
+ xenkbd_irq = ret;
+ xenkbd_dev->info = mfn_to_virt(xen_start_info->kbd_mfn);
+ }
+#else
+ printk(KERN_DEBUG "xenkbd_resume not implemented\n");
+#endif
+}
+
+module_init(xenkbd_init);
+module_exit(xenkbd_cleanup);
+
+MODULE_LICENSE("GPL");
diff -r d8434a6fdd05 include/linux/xenfb.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/xenfb.h Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,97 @@
+/*
+ * linux/include/linux/xenfb.h -- Xen virtual frame buffer device
+ *
+ * Copyright (C) 2005
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#ifndef _LINUX_XENFB_H
+#define _LINUX_XENFB_H
+
+#include <asm/types.h>
+
+/* out events */
+
+#define XENFB_TYPE_MOTION 1
+#define XENFB_TYPE_UPDATE 2
+
+struct xenfb_motion
+{
+ __u8 type; /* XENFB_TYPE_MOTION */
+ __u16 x; /* The new x coordinate */
+ __u16 y; /* The new y coordinate */
+};
+
+struct xenfb_update
+{
+ __u8 type; /* XENFB_TYPE_UPDATE */
+ __u16 x; /* source x */
+ __u16 y; /* source y */
+ __u16 width; /* rect width */
+ __u16 height; /* rect height */
+};
+
+union xenfb_out_event
+{
+ __u8 type;
+ struct xenfb_motion motion;
+ struct xenfb_update update;
+ char _[40];
+};
+
+/* in events */
+
+#define XENFB_TYPE_SET_EVENTS 1
+
+#define XENFB_FLAG_MOTION 1
+#define XENFB_FLAG_UPDATE 2
+#define XENFB_FLAG_COPY 4
+#define XENFB_FLAG_FILL 8
+
+struct xenfb_set_events
+{
+ __u8 type; /* XENFB_TYPE_SET_EVENTS */
+ __u32 flags; /* combination of XENFB_FLAG_* */
+};
+
+union xenfb_in_event
+{
+ __u8 type;
+ struct xenfb_set_events set_events;
+ char _[40];
+};
+
+/* shared page */
+
+#define XENFB_IN_RING_SIZE (1024 / 40)
+#define XENFB_OUT_RING_SIZE (2048 / 40)
+
+#define XENFB_RING_SIZE(ring) (sizeof((ring)) / sizeof(*(ring)))
+#define XENFB_RING_REF(ring, idx) (ring)[(idx) % XENFB_RING_SIZE((ring))]
+
+struct xenfb_page
+{
+ __u8 initialized;
+ __u16 width; /* the width of the framebuffer (in pixels) */
+ __u16 height; /* the height of the framebuffer (in pixels) */
+ __u32 line_length; /* the length of a row of pixels (in bytes) */
+ __u32 mem_length; /* the length of the framebuffer (in bytes) */
+ __u8 depth; /* the depth of a pixel (in bits) */
+
+ unsigned long pd[2];
+
+ __u32 in_cons, in_prod;
+ __u32 out_cons, out_prod;
+
+ union xenfb_in_event in[XENFB_IN_RING_SIZE];
+ union xenfb_out_event out[XENFB_OUT_RING_SIZE];
+};
+
+void xenfb_resume(void);
+
+#endif
diff -r d8434a6fdd05 include/linux/xenkbd.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/xenkbd.h Mon Jul 10 20:18:50 2006 +0200
@@ -0,0 +1,82 @@
+/*
+ * linux/include/linux/xenkbd.h -- Xen virtual keyboard/mouse
+ *
+ * Copyright (C) 2005
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#ifndef _LINUX_XENKBD_H
+#define _LINUX_XENKBD_H
+
+#include <asm/types.h>
+
+/* in events */
+
+#define XENKBD_TYPE_MOTION 1 /* mouse movement event */
+#define XENKBD_TYPE_BUTTON 2 /* mouse button event */
+#define XENKBD_TYPE_KEY 3 /* keyboard event */
+
+struct xenkbd_motion
+{
+ __u8 type; /* XENKBD_TYPE_MOTION */
+ __s16 rel_x; /* relative X motion */
+ __s16 rel_y; /* relative Y motion */
+};
+
+struct xenkbd_button
+{
+ __u8 type; /* XENKBD_TYPE_BUTTON */
+ __u8 pressed; /* 1 if pressed; 0 otherwise */
+ __u8 button; /* the button (0, 1, 2 is right, middle, left) */
+};
+
+struct xenkbd_key
+{
+ __u8 type; /* XENKBD_TYPE_KEY */
+ __u8 pressed; /* 1 if pressed; 0 otherwise */
+ __u16 keycode; /* KEY_* from linux/input.h */
+};
+
+union xenkbd_in_event
+{
+ __u8 type;
+ struct xenkbd_motion motion;
+ struct xenkbd_button button;
+ struct xenkbd_key key;
+ char _[40];
+};
+
+/* out events */
+
+union xenkbd_out_event
+{
+ __u8 type;
+ char _[40];
+};
+
+/* shared page */
+
+#define XENKBD_IN_RING_SIZE (2048 / 40)
+#define XENKBD_OUT_RING_SIZE (1024 / 40)
+
+#define XENKBD_RING_SIZE(ring) (sizeof((ring)) / sizeof(*(ring)))
+#define XENKBD_RING_REF(ring, idx) (ring)[(idx) % XENKBD_RING_SIZE((ring))]
+
+struct xenkbd_info
+{
+ __u8 initialized;
+ __u32 in_cons, in_prod;
+ __u32 out_cons, out_prod;
+
+ union xenkbd_in_event in[XENKBD_IN_RING_SIZE];
+ union xenkbd_out_event out[XENKBD_OUT_RING_SIZE];
+};
+
+void xenkbd_resume(void);
+
+#endif
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