Date: Sun, 13 Feb 2005 10:59:22 -0800 From: Nate Lawson <nate@root.org> To: acpi@FreeBSD.org Cc: current@FreeBSD.org Subject: [Fwd: cvs commit: src/sys/dev/acpica acpi_perf.c src/sys/kern kern_cpu.c] Message-ID: <420FA38A.6080009@root.org>
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The commit below allows acpi_perf(4) to attach to FFixedHW devices and
export settings to other drivers (say, EST and Powernow). The code
snippet for foo_probe() to do this is as follows:
/* Find an acpi_perf child under our common parent. */
device_t child;
child = device_find_child(device_get_parent(dev), "acpi_perf", -1);
if (child == NULL || !device_is_attached(child))
... do whatever you can from static tables or fail ...
/* Get its settings so we know what frequencies it offers. */
error = CPUFREQ_DRV_SETTINGS(child, sets, &count, &type);
if (error)
... fall back to static tables ...
/*
* If the device is not offering info, it thinks it can control
* settings itself. We fail out of our probe in this case since
* it is already in charge.
*/
if ((type & CPUFREQ_FLAG_INFO_ONLY) == 0)
return (ENXIO);
/* Loop through all settings and match up to our levels */
for ()
powernow_sets[i].freq = sets[i].freq
powernow_sets[i].power = sets[i].power;
...
-------- Original Message --------
njl 2005-02-13 18:49:48 UTC
FreeBSD src repository
Modified files:
sys/dev/acpica acpi_perf.c
sys/kern kern_cpu.c
Log:
Add support for the CPUFREQ_FLAG_INFO_ONLY flag. Devices that report
this
are not added to the list(s) of available settings. However, other
drivers
can call the CPUFREQ_DRV_SETTINGS() method on those devices directly to
get info about available settings.
Update the acpi_perf(4) driver to use this flag in the presence of
"functional fixed hardware." Thus, future drivers like Powernow can
query acpi_perf for platform info but perform frequency transitions
themselves.
Revision Changes Path
1.7 +39 -12 src/sys/dev/acpica/acpi_perf.c
1.4 +8 -1 src/sys/kern/kern_cpu.c
--
Nate
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