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Date: Fri, 11 Jan 2008 16:16:22 +0800 From: Zhang Rui <rui.zhang@...el.com> To: Maxim Levitsky <maximlevitsky@...il.com>, yi.y.yang@...el.com, david-b@...bell.net Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, lenb@...nel.org, acpi-bugzilla@...ts.sourceforge.net Subject: Re: [PATCH] ACPI: Add sysfs interface for acpi device wakeup On Thu, 2008-01-10 at 09:43 +0200, Maxim Levitsky wrote: > On Thursday, 10 January 2008 00:21:46 Yi Yang wrote: > > Subject: ACPI: convert procfs to sysfs for /proc/acpi/wakeup > > From: Yi Yang <yi.y.yang@...el.com> > > > > /proc/acpi/wakeup is deprecated but it has to exist because > > we haven't a sysfs interface to replace it yet, this patch > > converts /proc/acpi/wakeup to sysfs interface, under every > > acpi device sysfs node, a user can see a directory "wakeup" > > if the acpi device can support wakeup, there are six files > > under this directory: > > > > acpi_bus_id bus_id pci_id run_wakeup sleep_state status > > > > All the files are read-only exclude "status" which is used > > to enable or disable wakeup of the acpi device. > > > > "acpi_bus_id" is acpi bus ID of the acpi device. > > > > "bus_id" is pci bus id of the device associated to the acpi > > device, it will be empty if there isn't any device associated > > to it. > > > > "pci_id" is PCI ID of the pci device associated to the acpi > > device, it will be empty if there isn't any device associated > > to it. > > > > "run_wake" is a flag indicating if a wakeup process is being > > handled. > > > > "sleep_state" is sleep state of the acpi device such as "S0". > > > > "status" is wakeup status of the acpi device, it is enabled > > or disabled, a user can change it be echoing "0", "1", > > "disabled" or "enabled" to /sys/devices/.../wakeup/status. > > > > Here is the test result: > > > > [root@...alhost ~]# cat /proc/acpi/wakeup > > Device S-state Status Sysfs node PCI ID > > C093 S5 disabled pci:0000:00:1e.0 0x2448 > > C0E8 S3 disabled pci:0000:00:1d.0 0x27c8 > > C0EF S3 disabled pci:0000:00:1d.1 0x27c9 > > C0F0 S3 disabled pci:0000:00:1d.2 0x27ca > > C0F1 S3 disabled pci:0000:00:1d.3 0x27cb > > C0F2 S3 disabled pci:0000:00:1d.7 0x27cc > > C0F9 S0 disabled pci:0000:00:1c.0 0x27d0 > > C21D S0 disabled pci:0000:08:00.0 0x16fd > > C109 S5 disabled pci:0000:00:1c.1 0x27d2 > > C228 S5 disabled pci:0000:10:00.0 0x4222 > > C10F S5 disabled pci:0000:00:1c.3 0x27d6 > > C229 S5 disabled > > [root@...alhost ~]# find /sys -name "*" | grep sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:05/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0d/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:11/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:15/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:19/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:1d/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2b/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2b/device:2c/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2d/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2d/device:2e/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/wakeup/sleep_state > > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/sleep_state > > [root@...alhost ~]# ls /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup > > acpi_bus_id bus_id pci_id run_wakeup sleep_state status > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/acpi_bus_id > > cat: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/acpi_bus_id: No such file or directory > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/acpi_bus_id > > C229 > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/sleep_state > > S5 > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status > > disabled > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/bus_id > > > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/pci_id > > > > [root@...alhost ~]# echo 1 > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status > > enabled > > [root@...alhost ~]# cat /proc/acpi/wakeup > > Device S-state Status Sysfs node PCI ID > > C093 S5 disabled pci:0000:00:1e.0 0x2448 > > C0E8 S3 disabled pci:0000:00:1d.0 0x27c8 > > C0EF S3 disabled pci:0000:00:1d.1 0x27c9 > > C0F0 S3 disabled pci:0000:00:1d.2 0x27ca > > C0F1 S3 disabled pci:0000:00:1d.3 0x27cb > > C0F2 S3 disabled pci:0000:00:1d.7 0x27cc > > C0F9 S0 enabled pci:0000:00:1c.0 0x27d0 > > C21D S0 enabled pci:0000:08:00.0 0x16fd > > C109 S5 enabled pci:0000:00:1c.1 0x27d2 > > C228 S5 enabled pci:0000:10:00.0 0x4222 > > C10F S5 enabled pci:0000:00:1c.3 0x27d6 > > C229 S5 enabled > > [root@...alhost ~]# vi /var/log/dmesg > > [root@...alhost ~]# dmesg | grep "same GPE" > > ACPI: 'C0F9' and 'C229' have the same GPE, can't disable/enable one seperately > > ACPI: 'C21D' and 'C229' have the same GPE, can't disable/enable one seperately > > ACPI: 'C109' and 'C229' have the same GPE, can't disable/enable one seperately > > ACPI: 'C228' and 'C229' have the same GPE, can't disable/enable one seperately > > ACPI: 'C10F' and 'C229' have the same GPE, can't disable/enable one seperately > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/*/wakeup/status > > disabled > > disabled > > disabled > > disabled > > disabled > > disabled > > enabled > > enabled > > enabled > > [root@...alhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/*/*/wakeup/status > > enabled > > enabled > > enabled > > [root@...alhost ~]# > > > I think that it would be much much better to place wake-up attributes under > corresponding PCI and PNP devices. > Probably it is even better to link this code to PCI code, so PCI drivers will be aware of ACPI. I like this idea, maxim. :) And that's what we actually did about half a year ago. Yi, Please refer to http://bugzilla.kernel.org/show_bug.cgi?id=6892 and David's patch set here: http://marc.info/?l=linux-mm-commits&m=117701595209299&w=2 http://marc.info/?l=linux-mm-commits&m=117701866524935&w=2 You can have a look at this thread as well: http://marc.info/?l=linux-acpi&m=119982937409968&w=2 thanks, Rui > For example it will fix the 'EHCI instantly wakes up the system from S4' on my system, since here USB doesn't wake > up anything from S4, and ACPI tables correctly show that. > > If ehci driver was aware of that it could disable #PME on entrance to S4. > And we even can reuse its 'wakeup' attribute, thus enabling wakeup automatically. > > Going ever further, I think that it will be great to get rid of ACPI device tree, since > most acpi devices are ether PCI of PNP ones. > > Or, even better have a small ACPI tree, that will contain 'true' ACPI devices, like cpus > thermal sensors, buttons, etc. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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