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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] xenfb: Dynamic modes support
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1206521664 0
# Node ID 92f7b3144f4121275eab4923755926cb267c42b4
# Parent ba11d3cf69f0cef7c1f52affdbc854545b0028a7
xenfb: Dynamic modes support
Corresponding backend IOEMU patch is required for functionality but
this patch is not dependent on it, preserving backwards compatibility.
Signed-off-by: Pat Campbell <plc@xxxxxxxxxx>
---
drivers/xen/fbfront/xenfb.c | 192 ++++++++++++++++++++++++++++++++--------
drivers/xen/fbfront/xenkbd.c | 10 ++
include/xen/interface/io/fbif.h | 28 ++++-
3 files changed, 191 insertions(+), 39 deletions(-)
diff -r ba11d3cf69f0 -r 92f7b3144f41 drivers/xen/fbfront/xenfb.c
--- a/drivers/xen/fbfront/xenfb.c Wed Mar 26 08:52:36 2008 +0000
+++ b/drivers/xen/fbfront/xenfb.c Wed Mar 26 08:54:24 2008 +0000
@@ -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 resize
+ * 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 +177,18 @@ 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.resize = info->resize;
+
+ /* caller ensures !xenfb_queue_full() */
+ xenfb_send_event(info, &event);
}
static int xenfb_queue_full(struct xenfb_info *info)
@@ -209,11 +240,26 @@ 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)
+{
+ unsigned long 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 +459,56 @@ 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.type = XENFB_TYPE_RESIZE;
+ 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 +516,8 @@ 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 +548,8 @@ 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 +557,27 @@ 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 +585,12 @@ 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 +605,6 @@ 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 +618,9 @@ 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 +632,9 @@ 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 +647,8 @@ 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 +687,7 @@ 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 +713,11 @@ 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 +725,14 @@ 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 +831,11 @@ 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 ba11d3cf69f0 -r 92f7b3144f41 drivers/xen/fbfront/xenkbd.c
--- a/drivers/xen/fbfront/xenkbd.c Wed Mar 26 08:52:36 2008 +0000
+++ b/drivers/xen/fbfront/xenkbd.c Wed Mar 26 08:54:24 2008 +0000
@@ -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 ba11d3cf69f0 -r 92f7b3144f41 include/xen/interface/io/fbif.h
--- a/include/xen/interface/io/fbif.h Wed Mar 26 08:52:36 2008 +0000
+++ b/include/xen/interface/io/fbif.h Wed Mar 26 08:54:24 2008 +0000
@@ -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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