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40 lines
1.6 KiB
Python
40 lines
1.6 KiB
Python
class GraphicsBase:
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def get_n_fb_crc(self, *, count=10, uniq=False, timeout=-1):
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"""
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Return count DRM CRC from the framebuffer. If uniq is True,
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only unique CRCs are returned (which may be less than the
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requested cont).
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Returns a possibly empty list of integers.
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Set timeout to -1 for no timeout, or to a positive number for
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a timeout of that many seconds.
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"""
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# DRM CRCs are exposed through a sysfs pseudo file
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try:
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self.debugfs_mounted
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except AttributeError:
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# Note: some init system (e.g. systemd) may have this already
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# mounted, so check beforehand
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self.assertRunOk("mountpoint /sys/kernel/debug/ || mount -t debugfs none /sys/kernel/debug/")
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self.debugfs_mounted = True
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# The first column is the frame number, the second column is the
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# CRC measure. We use "head" to get the needed CRC count.
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disp_crc_path = "/sys/kernel/debug/dri/0/crtc-0/crc/data"
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cmd = f"head -{count} {disp_crc_path}"
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# The DRM CRC sysfs pseudo file lines are terminated by '\n'
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# and '\0'. We remove the '\0' to have a text-only output.
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cmd += " | tr -d '\\000'"
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# Finally, we drop the frame counter, and keep only the second
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# column (CRC values)
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cmd += " | cut -f 2 -d ' '"
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if uniq:
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cmd += " | sort -u"
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output, exit_code = self.emulator.run(cmd, timeout=timeout)
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self.assertTrue(exit_code == 0, f"'{cmd}' failed with exit code {exit_code}")
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return [int(crc, 16) for crc in output]
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