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Date: Thu, 6 Jul 2006 13:50:59 -0500
To: Auke Kok <sofar@foo-projects.org>
Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Auke Kok <auke-jan.h.kok@intel.com>,
       Jesse Brandeburg <jesse.brandeburg@intel.com>,
       "Ronciak, John" <john.ronciak@intel.com>,
       "bibo,mao" <bibo.mao@intel.com>, Rajesh Shah <rajesh.shah@intel.com>,
       Grant Grundler <grundler@parisc-linux.org>, akpm@osdl.org,
       LKML <linux-kernel@vger.kernel.org>,
       linux-pci maillist <linux-pci@atrey.karlin.mff.cuni.cz>,
       netdev@vger.kernel.org, wenxiong@us.ibm.com
Subject: Re: [PATCH] ixgb: add PCI Error recovery callbacks
Message-ID: <20060706185059.GX29526@austin.ibm.com>
References: <20060629162634.GC5472@austin.ibm.com> <1151905766.28493.129.camel@ymzhang-perf.sh.intel.com> <44ABDF87.8000801@intel.com> <20060705194437.GJ29526@austin.ibm.com> <1152148899.28493.168.camel@ymzhang-perf.sh.intel.com> <20060706161640.GT29526@austin.ibm.com> <44AD4FFF.4080204@foo-projects.org>
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From: linas@austin.ibm.com (Linas Vepstas)
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On Thu, Jul 06, 2006 at 11:01:35AM -0700, Auke Kok wrote:
> Linas Vepstas wrote:
> >
> >Perhaps the right fix is to figure out what parts of the driver do i/o
> >during shutdown, and then add a line "if(wedged) skip i/o;" to those
> >places?
> 
> that would be relatively simple if we can check a flag (?) somewhere that 
> signifies that we've encountered a pci error. We basically only need to 
> skip out after e1000_reset and bypass e1000_irq_disable in e1000_down() 
> then.
> 
> Does the pci error recovery code give us such a flag?

Yes, it was introduced so that drivers could view the state in 
an interrupt context. (how this flag is set is platform dependent.)

struct pci_dev {
         pci_channel_state error_state;
 };

enum pci_channel_state {
   /* I/O channel is in normal state */
   pci_channel_io_normal,

   /* I/O to channel is blocked */
   pci_channel_io_frozen,

   /* PCI card is dead */
   pci_channel_io_perm_failure,
};


Unless I get distracted, I'll provide an e1000 patch shortly ?

--linas