[RFC] Add IBM Blue Gene/Q Platform

Sat Dec 8 00:44:37 EST 2012

On Dec 6, 2012, at 11:56 PM, Michael Neuling <mikey at neuling.org> wrote:

> Jimi Xenidis <jimix at pobox.com> wrote:
> 
>> Rather than flood the mailing list with the patches, I've arranged for a git repo to hold the changesets.
>> You can find the repo here:
>>  <https://github.com/jimix/linux-bgq>
>> 
>> They are against GregKH's linux-stable.git long-term 3.4.y (y=22) branch.
>> The first 9 (6e58088f..) effect common code and the rest are BGQ specific.
> 
> Do you actually want this upstream?  I assume no.

I needed to get these long-term patches out there for the BGQ community for test.
I would very much like to get a version of these upstream.
I expect only the QPX, kexec, and (maybe) the DCR changes to cause any controversy, but I've been wrong before.
I'll be making those patches soon and hope to get a lot of feedback from these patches.
-jx

> 
> Mikey
> 
>> 
>> Here is a are the summary logs:
>> 
>> $ git log --reverse linux-stable/linux-3.4.y..
>> commit 5a8edb2bdd914597693eed299119ff4c2e6d31f2
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Fri Nov 9 09:26:00 2012 -0600
>> 
>>    powerpc: Fix cputable #ifdef where CONFIG_PPC_A2 is used for CONFIG_PPC_BOOK3E_64
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit ea51920d7035c8d23801d6de46261e7d0a537dfd
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Fri Nov 9 08:58:27 2012 -0600
>> 
>>    powerpc/book3e: Remove config for PPC_A2_DD2 since there is no reference to it
>> 
>>    This must have been leftover from early DD1 days which is not
>>    present in any current kernel code.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 08151401a5db4ff0d441a1b7bf8ad92bd92b14c5
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Mon Nov 5 09:38:01 2012 -0600
>> 
>>    powerpc/dcr: Some native DCR fixes
>> 
>>    The following fixes have been made:
>>     - dcr_read/write_native() must use the indexed version of the
>>       m[ft]dcrx since the non-indexed version only allows a 10-bit
>>       numerical space, but the C interface allows a full 32-bits.
>>     - C bindings for m[ft]dcrx, and the "table" versions, should use
>>       "unsigned long" so that they are 64/32 bit neutral.
>>     - The "table" versions (__m[ft]cdr) should obtain the table address
>>       with LOAD_REG_ADDR(), this will also make it 64/32bit neutral.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit c8320a5daaceed03992d763302020834ea8e17dd
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Mon Nov 5 09:12:00 2012 -0600
>> 
>>    powerpc/dcr: Add 64-bit DCR access methods.
>> 
>>    This patch adds the ability to make 64-bit Device Control Register
>>    (DCR) accesses.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit a763b3f8453b3bd83d7dded8c6644939863af430
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Thu Nov 29 12:49:24 2012 -0500
>> 
>>    powerpc/boot: Add a "spin_threads" hook to platform_ops
>> 
>>    It is useful for the boot program to arrange for all secondary cpus
>>    and threads to enter the kernel in a "kexec" fashion.  This hook makes
>>    it possible.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 391e43393380b514d4d02a42d059619542c7597b
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Thu Nov 29 13:01:23 2012 -0500
>> 
>>    powerpc/kexec: Add kexec "hold" support for Book3e processors
>> 
>>    This patch add two items:
>>    1) Book3e requires that GPR4 survive the "hold" process, so we make
>>       sure that happens.
>>    2) Book3e has no real mode, and the hold code exploits this.  Since
>>       these processors ares always translated, we arrange for the kexeced
>>       threads to enter the hold code using the normal kernel linear mapping.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit f6e3c1f706cb6922349d639a74ff6c50acc8b9f8
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Wed Dec 5 13:41:25 2012 -0500
>> 
>>    powerpc: Remove unecessary VSX symbols
>> 
>>    The symbol THREAD_VSR0 is defined to be the same as THREAD_FPR0.  Its
>>    presence causes build issues with more complex configurations.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 4e817bb42ec8e3d3689877528dd97c4286a870eb
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Tue Nov 20 10:10:52 2012 -0600
>> 
>>    Blue Gene/Q wicked optimizing compiler does not know the rfdi instruction yet
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 2071aa58b2f3b33d97c94e3a127f7c5d4ffaeb34
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Tue Nov 20 10:14:22 2012 -0600
>> 
>>    Blue Gene/Q wicked optimizing compiler does not know the mfdcrx instruction yet
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 6e58088fabedbb2d724637b539ba180c03ed8b68
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Wed Oct 31 16:33:21 2012 -0500
>> 
>>    powerpc/book3e: IBM Blue Gene/Q Boot
>> 
>>    This patch specifically deals with the initial program load
>>    environment so that a boot image (dtbImage.bgq) can be loaded by the
>>    BGQ management tools.  The boot code is a little odd because it has to
>>    deal with the following issues:
>>     - Linux boot image wrappers are 32-bit programs
>>     - BGQ Tools only load 64bit ELF programs
>>     - BGQ Firmware information is typically loaded at an address > 4G
>>     - BGQ FW information contains 64-bit ABI function pointers (which are
>>       actually function descriptors) to access firmware methods
>>     - BGQ FW methods must be called in 64-bit mode
>> 
>>    Includes code contributed from:
>>      Andrew Tauferner <ataufer at us.ibm.com>
>>      Todd Inglett <tinglett at us.ibm.com>
>>      Eric Van Hensbergen <ericvh at gmail.com>
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 3bc841935eb4955ce2b2db69bff16f7928464597
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Wed Oct 31 22:36:54 2012 -0500
>> 
>>    powerpc/book3e: IBM Blue Gene/Q Platform and SMP
>> 
>>    This patch introduces BGQ as a platform and adds SMP functionality
>> 
>>    Includes code contributed from:
>>      Andrew Tauferner <ataufer at us.ibm.com>
>>      Todd Inglett <tinglett at us.ibm.com>
>>      Eric Van Hensbergen <ericvh at gmail.com>
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 279c0615917b959a652e81f4ad0d886e2d426d85
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Wed Dec 5 13:43:22 2012 -0500
>> 
>>    powerpc/book3e: IBM Blue Gene/Q Quad Processing eXtention (QPX)
>> 
>>    This enables kernel support for the QPX extention and is intended for
>>    processors that support it, usually an IBM Blue Gene processor.
>>    Turning it on does not effect other processors but it does add code
>>    and will quadruple the per thread save and restore area for the FPU
>>    (hense the name).  If you have enabled VSX it will only double the
>>    space.
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 6ff45170ab0463fb34d7011e08c7e47c396f0fd7
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Fri Nov 23 14:52:14 2012 -0600
>> 
>>    powerpc/book3e: IBM Blue Gene/Q HVC Based Firmware Console
>> 
>>    New HVC device that uses the Blue Gene Firmware methods to erad and
>>    write to console.
>> 
>>        Includes code contributed from:
>>          Andrew Tauferner <ataufer at us.ibm.com>
>>          Todd Inglett <tinglett at us.ibm.com>
>>          Eric Van Hensbergen <ericvh at gmail.com>
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit e4ddc0c2ad8b3f0260d15d73e153095e95da84ac
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Thu Nov 29 15:52:04 2012 -0500
>> 
>>    powerpc/book3e: IBM Blue Gene/Q PCIe and MSI
>> 
>>    The following patch adds support for the BG/Q PCIe bridge and MSI interrupts.
>> 
>>    Includes code contributed from:
>>      Jay S. Bryant <jsbryant at us.ibm.com>
>>      Eric Van Hensbergen <ericvh at gmail.com>
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 9fc0b6f729f7bd7e31338283640a718fa4b1693b
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Wed Dec 5 07:01:49 2012 -0500
>> 
>>    powerpc/book3e: IBM Blue Gene/Q Character Drivers
>> 
>>    The following patch adds support for user and administration
>>    applications to access the BG/Q control system.
>> 
>>    Includes code contributed from:
>>      Jay S. Bryant <jsbryant at us.ibm.com>
>>      Eric Van Hensbergen <ericvh at gmail.com>
>> 
>>    Signed-off-by: Jimi Xenidis <jimix at pobox.com>
>> 
>> commit 9df2c4dfde0ac75f8b2bfcf565f78c2b7382b031
>> Author: Jimi Xenidis <jimix at pobox.com>
>> Date:   Thu Dec 6 18:07:16 2012 -0500
>> 
>>    Linux 3.4.22-BGQ-rc1
>> 
>> 
>> 
>> 
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