Date: Mon, 06 Apr 2009 17:28:03 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-current@freebsd.org Subject: ichwd: option to globally disable SMI Message-ID: <49DA1173.1080606@icyb.net.ua>
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This is a multi-part message in MIME format. --------------090605060706050509000707 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Our ichwd driver attempts to disable TCO SMI generation to avoid potentially unhelpful SMI handler's handling of watchdog timeout. Recent ICH versions allow TCO SMI bit to be locked down (typically by BIOS), so that it can not be changed later. ichwd driver at present doesn't check result of changing the bit, so it doesn't report a failure. If the bit is locked and SMI handler is indeed unhelpful the only remaining possibility is to try to disable SMI completely. This bit too can be locked, but there is a chance that it is not. I am attaching a patch that makes ichwd check and report result of SMI bit operations and also try to disable SMI globally if permitted by hw.ichwd.use_global_smi tunable. This patch could be useful to you if the following two conditions are met: 1. existing ichwd driver successfully attaches and does not produce any errors/warnings; 2. kill -9 on watchdogd doesn't result in machine being rebooted after timeout; I am using this patch on DG33TL motherboard for couple of weeks now. I do not see any side-effects from disabling SMI and watchdog works as expected. P.S. I tried to contact Intel's customer support about my problem and I was told that watchdog is supported by Intel only on Extreme Edition motherboards, which my motherboard is not. I wonder if anybody here uses FreeBSD with such a motherboard and ichwd works properly indeed. -- Andriy Gapon --------------090605060706050509000707 Content-Type: text/plain; name="ichwd-7.diff" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="ichwd-7.diff" ZGlmZiAtLWdpdCBhL3N5cy9kZXYvaWNod2QvaWNod2QuYyBiL3N5cy9kZXYvaWNod2QvaWNo d2QuYwppbmRleCAzNWY4YjVmLi5hNDM4N2EyIDEwMDY0NAotLS0gYS9zeXMvZGV2L2ljaHdk L2ljaHdkLmMKKysrIGIvc3lzL2Rldi9pY2h3ZC9pY2h3ZC5jCkBAIC02Miw2ICs2Miw3IEBA IF9fRkJTRElEKCIkRnJlZUJTRCQiKTsKICNpbmNsdWRlIDxzeXMva2VybmVsLmg+CiAjaW5j bHVkZSA8c3lzL21vZHVsZS5oPgogI2luY2x1ZGUgPHN5cy9zeXN0bS5oPgorI2luY2x1ZGUg PHN5cy9zeXNjdGwuaD4KICNpbmNsdWRlIDxzeXMvYnVzLmg+CiAjaW5jbHVkZSA8bWFjaGlu ZS9idXMuaD4KICNpbmNsdWRlIDxzeXMvcm1hbi5oPgpAQCAtNzIsNiArNzMsMTQgQEAgX19G QlNESUQoIiRGcmVlQlNEJCIpOwogCiAjaW5jbHVkZSA8ZGV2L2ljaHdkL2ljaHdkLmg+CiAK Kworc3RhdGljIGludCB1c2VfZ2xvYmFsX3NtaSA9IDA7CisKK1NZU0NUTF9OT0RFKF9odywg 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