linux-kernel - Re: [RFC/RFT, RESEND] powerpc: move cacheinfo sysfs to generic cacheinfo infrastructure

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Date:	Wed, 01 Apr 2015 15:40:42 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [RFC/RFT, RESEND] powerpc: move cacheinfo sysfs to generic
 cacheinfo infrastructure

On Tue, 2015-03-31 at 18:14 +0100, Sudeep Holla wrote:
> 
> On 31/03/15 11:56, Michael Ellerman wrote:
> > On Mon, 2015-23-02 at 18:18:20 UTC, Sudeep Holla wrote:
> >> This patch removes the redundant sysfs cacheinfo code by reusing
> >> the newly introduced generic cacheinfo infrastructure through the
> >> commit 246246cbde5e ("drivers: base: support cpu cache information
> >> interface to userspace via sysfs")
> 
> > Removing the include doesn't fix it, it needs cacheinfo_cpu_on/offline().
> >
> 
> I agree, had a quick look at that, and it requires some rework not sure
> if that should be in generic code or ppc specific.

Yeah OK.

Also if I just remove the references from the suspend code, it still causes
changes to the result, some of which look wrong:

--- cpu0.before	2015-04-01 15:34:58.985470973 +1100
+++ cpu0.after-no-power	2015-04-01 15:36:31.313435304 +1100
@@ -3,22 +3,24 @@
 ./cpu0/cache/index0/level:1
 ./cpu0/cache/index0/number_of_sets:8
 ./cpu0/cache/index0/shared_cpu_map:0000,000000ff
+./cpu0/cache/index0/shared_cpu_list:0-7		<- additional, OK
 ./cpu0/cache/index0/coherency_line_size:128
 ./cpu0/cache/index0/ways_of_associativity:64
-./cpu0/cache/index1/size:32K				<- we lost the size of the Icache?
 ./cpu0/cache/index1/type:Instruction
 ./cpu0/cache/index1/level:1
-./cpu0/cache/index1/number_of_sets:4			}-.
-./cpu0/cache/index1/shared_cpu_map:0000,000000ff	  .
-./cpu0/cache/index1/coherency_line_size:128		  .   These changes are no good
-./cpu0/cache/index1/ways_of_associativity:64		  .
+./cpu0/cache/index1/shared_cpu_map:ffff,ffffffff	  .
+./cpu0/cache/index1/shared_cpu_list:0-47		}-
 ./cpu0/cache/index2/size:512K
 ./cpu0/cache/index2/type:Unified
 ./cpu0/cache/index2/level:2
 ./cpu0/cache/index2/number_of_sets:8
 ./cpu0/cache/index2/shared_cpu_map:0000,000000ff
+./cpu0/cache/index2/shared_cpu_list:0-7		<- additional, OK
+./cpu0/cache/index2/ways_of_associativity:0		<- this is new but wrong I think
 ./cpu0/cache/index3/size:8192K
 ./cpu0/cache/index3/type:Unified
 ./cpu0/cache/index3/level:3
 ./cpu0/cache/index3/number_of_sets:8
 ./cpu0/cache/index3/shared_cpu_map:0000,000000ff
+./cpu0/cache/index3/shared_cpu_list:0-7
+./cpu0/cache/index3/ways_of_associativity:0		<- ditto


cheers


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