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https://github.com/edk2-porting/linux-next.git
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Staging: udlfb: Add functions to expose sysfs metrics and controls
Add sysfs controls for edid and performance metrics There are 8 new files exposed in /sys/class/graphics/fb* edid - returns 128 byte edid blog, suitable for parsing with parse-edid metrics_bytes_identical metrics_bytes_rendered metrics_bytes_sent metrics_cpu_kcycles_used metrics_misc and metrics_reset, which resets all perf metrics to zero The 6 perf metrics are of type atomic_t. So these metrics return precise results for short benchmarks, but any test approx a minute or longer runtime may roll over. Signed-off-by: Bernie Thompson <bernie@plugable.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bernie Thompson
Greg Kroah-Hartman
parent
4574203f45
commit
7d9485e2c5
@ -818,6 +818,21 @@ static void dlfb_ops_fillrect(struct fb_info *info,
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}
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static void dlfb_get_edid(struct dlfb_data *dev)
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{
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int i;
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int ret;
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char rbuf[2];
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for (i = 0; i < sizeof(dev->edid); i++) {
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ret = usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0), (0x02),
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(0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
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0);
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dev->edid[i] = rbuf[1];
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}
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}
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static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
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unsigned long arg)
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{
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@ -924,6 +939,33 @@ static void dlfb_delete(struct kref *kref)
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kfree(dev);
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}
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/*
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* Check whether a video mode is supported by the DisplayLink chip
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* We start from monitor's modes, so don't need to filter that here
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*/
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static int dlfb_is_valid_mode(struct fb_videomode *mode,
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struct fb_info *info)
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{
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struct dlfb_data *dev = info->par;
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if (mode->xres * mode->yres > dev->sku_pixel_limit)
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return 0;
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return 1;
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}
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static void dlfb_var_color_format(struct fb_var_screeninfo *var)
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{
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const struct fb_bitfield red = { 11, 5, 0 };
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const struct fb_bitfield green = { 5, 6, 0 };
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const struct fb_bitfield blue = { 0, 5, 0 };
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var->bits_per_pixel = 16;
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var->red = red;
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var->green = green;
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var->blue = blue;
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}
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static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
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{
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struct dlfb_data *dev_info = info->par;
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@ -953,6 +995,215 @@ static struct fb_ops dlfb_ops = {
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.fb_blank = dlfb_ops_blank,
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};
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/*
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* Calls dlfb_get_edid() to query the EDID of attached monitor via usb cmds
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* Then parses EDID into three places used by various parts of fbdev:
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* fb_var_screeninfo contains the timing of the monitor's preferred mode
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* fb_info.monspecs is full parsed EDID info, including monspecs.modedb
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* fb_info.modelist is a linked list of all monitor & VESA modes which work
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*
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* If EDID is not readable/valid, then modelist is all VESA modes,
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* monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
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* Returns 0 if EDID parses successfully
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*/
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static int dlfb_parse_edid(struct dlfb_data *dev,
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struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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int i;
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const struct fb_videomode *default_vmode = NULL;
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int result = 0;
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fb_destroy_modelist(&info->modelist);
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memset(&info->monspecs, 0, sizeof(info->monspecs));
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dlfb_get_edid(dev);
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fb_edid_to_monspecs(dev->edid, &info->monspecs);
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if (info->monspecs.modedb_len > 0) {
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for (i = 0; i < info->monspecs.modedb_len; i++) {
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if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
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fb_add_videomode(&info->monspecs.modedb[i],
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&info->modelist);
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}
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default_vmode = fb_find_best_display(&info->monspecs,
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&info->modelist);
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} else {
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struct fb_videomode fb_vmode = {0};
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dl_err("Unable to get valid EDID from device/display\n");
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result = 1;
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/*
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* Add the standard VESA modes to our modelist
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* Since we don't have EDID, there may be modes that
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* overspec monitor and/or are incorrect aspect ratio, etc.
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* But at least the user has a chance to choose
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*/
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for (i = 0; i < VESA_MODEDB_SIZE; i++) {
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if (dlfb_is_valid_mode((struct fb_videomode *)
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&vesa_modes[i], info))
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fb_add_videomode(&vesa_modes[i],
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&info->modelist);
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}
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/*
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* default to resolution safe for projectors
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* (since they are most common case without EDID)
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*/
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fb_vmode.xres = 800;
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fb_vmode.yres = 600;
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fb_vmode.refresh = 60;
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default_vmode = fb_find_nearest_mode(&fb_vmode,
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&info->modelist);
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}
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fb_videomode_to_var(var, default_vmode);
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dlfb_var_color_format(var);
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return result;
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}
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static ssize_t metrics_bytes_rendered_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE, "%u\n",
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atomic_read(&dev->bytes_rendered));
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}
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static ssize_t metrics_bytes_identical_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE, "%u\n",
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atomic_read(&dev->bytes_identical));
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}
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static ssize_t metrics_bytes_sent_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE, "%u\n",
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atomic_read(&dev->bytes_sent));
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}
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static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE, "%u\n",
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atomic_read(&dev->cpu_kcycles_used));
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}
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static ssize_t metrics_misc_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE,
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"Calls to\ndamage: %u\nblit: %u\n"
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"defio faults: %u\ncopy: %u\n"
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"fill: %u\n\n"
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"active framebuffer clients: %d\n"
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"urbs available %d(%d)\n"
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"Shadow framebuffer in use? %s\n"
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"Any lost pixels? %s\n",
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atomic_read(&dev->damage_count),
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atomic_read(&dev->blit_count),
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atomic_read(&dev->defio_fault_count),
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atomic_read(&dev->copy_count),
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atomic_read(&dev->fill_count),
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dev->fb_count,
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dev->urbs.available, dev->urbs.limit_sem.count,
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(dev->backing_buffer) ? "yes" : "no",
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atomic_read(&dev->lost_pixels) ? "yes" : "no");
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}
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static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *a,
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char *buf, loff_t off, size_t count) {
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struct device *fbdev = container_of(kobj, struct device, kobj);
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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char *edid = &dev->edid[0];
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const size_t size = sizeof(dev->edid);
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if (dlfb_parse_edid(dev, &fb_info->var, fb_info))
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return 0;
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if (off >= size)
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return 0;
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if (off + count > size)
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count = size - off;
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memcpy(buf, edid + off, count);
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return count;
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}
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static ssize_t metrics_reset_store(struct device *fbdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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atomic_set(&dev->bytes_rendered, 0);
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atomic_set(&dev->bytes_identical, 0);
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atomic_set(&dev->bytes_sent, 0);
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atomic_set(&dev->cpu_kcycles_used, 0);
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atomic_set(&dev->blit_count, 0);
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atomic_set(&dev->copy_count, 0);
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atomic_set(&dev->fill_count, 0);
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atomic_set(&dev->defio_fault_count, 0);
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atomic_set(&dev->damage_count, 0);
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return count;
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}
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static ssize_t use_defio_show(struct device *fbdev,
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struct device_attribute *a, char *buf) {
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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atomic_read(&dev->use_defio));
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}
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static ssize_t use_defio_store(struct device *fbdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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if (count > 0) {
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if (buf[0] == '0')
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atomic_set(&dev->use_defio, 0);
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if (buf[0] == '1')
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atomic_set(&dev->use_defio, 1);
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}
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return count;
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}
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static struct bin_attribute edid_attr = {
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.attr.name = "edid",
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.attr.mode = 0444,
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.size = 128,
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.read = edid_show,
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};
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static struct device_attribute fb_device_attrs[] = {
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__ATTR_RO(metrics_bytes_rendered),
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__ATTR_RO(metrics_bytes_identical),
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__ATTR_RO(metrics_bytes_sent),
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__ATTR_RO(metrics_cpu_kcycles_used),
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__ATTR_RO(metrics_misc),
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__ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store),
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__ATTR_RW(use_defio),
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};
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/*
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* This is necessary before we can communicate with the display controller.
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*/
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@ -33,8 +33,12 @@ struct dlfb_data {
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char *bufend;
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char *backing_buffer;
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struct mutex bulk_mutex;
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int fb_count;
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atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
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atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
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atomic_t use_defio; /* 0 = rely on ioctls and blit/copy/fill rects */
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char edid[128];
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int sku_pixel_limit;
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int screen_size;
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int line_length;
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struct completion done;
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@ -43,6 +47,17 @@ struct dlfb_data {
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int base8;
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int base8d;
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u32 pseudo_palette[256];
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/* blit-only rendering path metrics, exposed through sysfs */
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atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
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atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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atomic_t bytes_sent; /* to usb, after compression including overhead */
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atomic_t cpu_kcycles_used; /* transpired during pixel processing */
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/* interface usage metrics. Clients can call driver via several */
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atomic_t blit_count;
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atomic_t copy_count;
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atomic_t fill_count;
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atomic_t damage_count;
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atomic_t defio_fault_count;
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};
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#define NR_USB_REQUEST_I2C_SUB_IO 0x02
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@ -99,6 +114,9 @@ static int dlfb_bulk_msg(struct dlfb_data *dev_info, int len)
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#define dlfb_set_register insert_command
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/* remove once this gets added to sysfs.h */
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#define __ATTR_RW(attr) __ATTR(attr, 0644, attr##_show, attr##_store)
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#define dl_err(format, arg...) \
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dev_err(dev->gdev, "dlfb: " format, ## arg)
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#define dl_warn(format, arg...) \
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