2005-04-17 06:20:36 +08:00
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/*
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* PowerPC64 LPAR Configuration Information Driver
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*
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* Dave Engebretsen engebret@us.ibm.com
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* Copyright (c) 2003 Dave Engebretsen
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* Will Schmidt willschm@us.ibm.com
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* SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
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* seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
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* Nathan Lynch nathanl@austin.ibm.com
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* Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This driver creates a proc file at /proc/ppc64/lparcfg which contains
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* keyword - value pairs that specify the configuration of the partition.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/slab.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/uaccess.h>
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#include <asm/lppaca.h>
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#include <asm/hvcall.h>
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2005-08-03 12:35:25 +08:00
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#include <asm/firmware.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/rtas.h>
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#include <asm/time.h>
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2005-06-26 05:54:42 +08:00
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#include <asm/prom.h>
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2005-11-11 20:04:40 +08:00
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#include <asm/vdso_datapage.h>
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2008-07-24 02:31:52 +08:00
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#include <asm/vio.h>
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2009-08-28 20:06:29 +08:00
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#include <asm/mmu.h>
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2005-04-17 06:20:36 +08:00
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2010-04-01 05:39:24 +08:00
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#define MODULE_VERS "1.9"
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2005-04-17 06:20:36 +08:00
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#define MODULE_NAME "lparcfg"
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/* #define LPARCFG_DEBUG */
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static struct proc_dir_entry *proc_ppc64_lparcfg;
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/*
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2006-06-29 13:07:42 +08:00
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* Track sum of all purrs across all processors. This is used to further
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* calculate usage values by different applications
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2005-04-17 06:20:36 +08:00
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*/
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static unsigned long get_purr(void)
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{
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unsigned long sum_purr = 0;
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int cpu;
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2006-03-29 06:50:51 +08:00
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for_each_possible_cpu(cpu) {
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2012-03-16 02:18:00 +08:00
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struct cpu_usage *cu;
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2005-04-17 06:20:36 +08:00
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2012-03-16 02:18:00 +08:00
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cu = &per_cpu(cpu_usage_array, cpu);
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sum_purr += cu->current_tb;
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2005-04-17 06:20:36 +08:00
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}
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return sum_purr;
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}
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2005-11-10 12:26:20 +08:00
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/*
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2005-04-17 06:20:36 +08:00
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* Methods used to fetch LPAR data when running on a pSeries platform.
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*/
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2008-07-24 02:27:30 +08:00
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2008-07-24 02:28:05 +08:00
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struct hvcall_ppp_data {
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u64 entitlement;
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u64 unallocated_entitlement;
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u16 group_num;
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u16 pool_num;
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u8 capped;
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u8 weight;
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u8 unallocated_weight;
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u16 active_procs_in_pool;
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u16 active_system_procs;
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2009-05-27 12:41:21 +08:00
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u16 phys_platform_procs;
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u32 max_proc_cap_avail;
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u32 entitled_proc_cap_avail;
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2008-07-24 02:28:05 +08:00
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};
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2005-04-17 06:20:36 +08:00
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/*
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* H_GET_PPP hcall returns info in 4 parms.
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* entitled_capacity,unallocated_capacity,
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* aggregation, resource_capability).
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*
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2005-11-10 12:26:20 +08:00
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* R4 = Entitled Processor Capacity Percentage.
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2005-04-17 06:20:36 +08:00
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* R5 = Unallocated Processor Capacity Percentage.
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* R6 (AABBCCDDEEFFGGHH).
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* XXXX - reserved (0)
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* XXXX - reserved (0)
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* XXXX - Group Number
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* XXXX - Pool Number.
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* R7 (IIJJKKLLMMNNOOPP).
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* XX - reserved. (0)
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* XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
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* XX - variable processor Capacity Weight
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* XX - Unallocated Variable Processor Capacity Weight.
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* XXXX - Active processors in Physical Processor Pool.
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2005-11-10 12:26:20 +08:00
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* XXXX - Processors active on platform.
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2009-05-27 12:41:21 +08:00
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* R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
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* XXXX - Physical platform procs allocated to virtualization.
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* XXXXXX - Max procs capacity % available to the partitions pool.
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* XXXXXX - Entitled procs capacity % available to the
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* partitions pool.
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2005-04-17 06:20:36 +08:00
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*/
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2008-07-24 02:28:05 +08:00
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static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
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2005-04-17 06:20:36 +08:00
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{
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unsigned long rc;
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2009-05-27 12:41:21 +08:00
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unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
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2006-07-19 06:01:28 +08:00
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2009-05-27 12:41:21 +08:00
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rc = plpar_hcall9(H_GET_PPP, retbuf);
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2006-07-19 06:01:28 +08:00
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2008-07-24 02:28:05 +08:00
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ppp_data->entitlement = retbuf[0];
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ppp_data->unallocated_entitlement = retbuf[1];
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ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
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ppp_data->pool_num = retbuf[2] & 0xffff;
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ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
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ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
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ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
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ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
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ppp_data->active_system_procs = retbuf[3] & 0xffff;
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2005-04-17 06:20:36 +08:00
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2009-05-27 12:41:21 +08:00
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ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
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ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
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ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
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2005-04-17 06:20:36 +08:00
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return rc;
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}
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2008-07-24 02:25:16 +08:00
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static unsigned h_pic(unsigned long *pool_idle_time,
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unsigned long *num_procs)
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2005-04-17 06:20:36 +08:00
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{
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unsigned long rc;
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2006-07-19 06:01:28 +08:00
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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rc = plpar_hcall(H_PIC, retbuf);
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*pool_idle_time = retbuf[0];
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*num_procs = retbuf[1];
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2008-07-24 02:25:16 +08:00
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return rc;
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}
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/*
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* parse_ppp_data
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* Parse out the data returned from h_get_ppp and h_pic
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*/
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static void parse_ppp_data(struct seq_file *m)
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{
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2008-07-24 02:28:05 +08:00
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struct hvcall_ppp_data ppp_data;
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2009-05-27 12:41:21 +08:00
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struct device_node *root;
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const int *perf_level;
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2008-07-24 02:25:16 +08:00
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int rc;
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2008-07-24 02:28:05 +08:00
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rc = h_get_ppp(&ppp_data);
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2008-07-24 02:25:16 +08:00
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if (rc)
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return;
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2009-01-06 22:26:03 +08:00
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seq_printf(m, "partition_entitled_capacity=%lld\n",
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2008-07-24 02:28:05 +08:00
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ppp_data.entitlement);
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seq_printf(m, "group=%d\n", ppp_data.group_num);
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seq_printf(m, "system_active_processors=%d\n",
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ppp_data.active_system_procs);
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2008-07-24 02:25:16 +08:00
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2011-03-31 09:57:33 +08:00
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/* pool related entries are appropriate for shared configs */
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2010-08-13 04:18:15 +08:00
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if (lppaca_of(0).shared_proc) {
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2008-07-24 02:25:16 +08:00
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unsigned long pool_idle_time, pool_procs;
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2008-07-24 02:28:05 +08:00
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seq_printf(m, "pool=%d\n", ppp_data.pool_num);
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2008-07-24 02:25:16 +08:00
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/* report pool_capacity in percentage */
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2008-07-24 02:28:05 +08:00
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seq_printf(m, "pool_capacity=%d\n",
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ppp_data.active_procs_in_pool * 100);
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2008-07-24 02:25:16 +08:00
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h_pic(&pool_idle_time, &pool_procs);
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seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
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seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
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}
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2008-07-24 02:28:05 +08:00
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seq_printf(m, "unallocated_capacity_weight=%d\n",
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ppp_data.unallocated_weight);
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seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
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seq_printf(m, "capped=%d\n", ppp_data.capped);
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2009-01-06 22:26:03 +08:00
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seq_printf(m, "unallocated_capacity=%lld\n",
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2008-07-24 02:28:05 +08:00
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ppp_data.unallocated_entitlement);
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2009-05-27 12:41:21 +08:00
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/* The last bits of information returned from h_get_ppp are only
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* valid if the ibm,partition-performance-parameters-level
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* property is >= 1.
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*/
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root = of_find_node_by_path("/");
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if (root) {
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perf_level = of_get_property(root,
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"ibm,partition-performance-parameters-level",
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NULL);
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if (perf_level && (*perf_level >= 1)) {
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seq_printf(m,
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"physical_procs_allocated_to_virtualization=%d\n",
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ppp_data.phys_platform_procs);
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seq_printf(m, "max_proc_capacity_available=%d\n",
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ppp_data.max_proc_cap_avail);
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seq_printf(m, "entitled_proc_capacity_available=%d\n",
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ppp_data.entitled_proc_cap_avail);
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}
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of_node_put(root);
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}
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2005-04-17 06:20:36 +08:00
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}
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|
2008-07-24 02:27:30 +08:00
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|
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/**
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* parse_mpp_data
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* Parse out data returned from h_get_mpp
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*/
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static void parse_mpp_data(struct seq_file *m)
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{
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struct hvcall_mpp_data mpp_data;
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int rc;
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rc = h_get_mpp(&mpp_data);
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if (rc)
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return;
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seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
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if (mpp_data.mapped_mem != -1)
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seq_printf(m, "mapped_entitled_memory=%ld\n",
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mpp_data.mapped_mem);
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seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
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seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
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seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
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seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
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mpp_data.unallocated_mem_weight);
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seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
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|
mpp_data.unallocated_entitlement);
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|
if (mpp_data.pool_size != -1)
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seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
|
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|
|
mpp_data.pool_size);
|
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seq_printf(m, "entitled_memory_loan_request=%ld\n",
|
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|
|
mpp_data.loan_request);
|
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|
seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
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|
|
}
|
|
|
|
|
2011-05-04 14:01:20 +08:00
|
|
|
/**
|
|
|
|
* parse_mpp_x_data
|
|
|
|
* Parse out data returned from h_get_mpp_x
|
|
|
|
*/
|
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|
|
static void parse_mpp_x_data(struct seq_file *m)
|
|
|
|
{
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|
|
struct hvcall_mpp_x_data mpp_x_data;
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|
|
if (!firmware_has_feature(FW_FEATURE_XCMO))
|
|
|
|
return;
|
|
|
|
if (h_get_mpp_x(&mpp_x_data))
|
|
|
|
return;
|
|
|
|
|
|
|
|
seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
|
|
|
|
|
|
|
|
if (mpp_x_data.pool_coalesced_bytes)
|
|
|
|
seq_printf(m, "pool_coalesced_bytes=%ld\n",
|
|
|
|
mpp_x_data.pool_coalesced_bytes);
|
|
|
|
if (mpp_x_data.pool_purr_cycles)
|
|
|
|
seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
|
|
|
|
if (mpp_x_data.pool_spurr_cycles)
|
|
|
|
seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#define SPLPAR_CHARACTERISTICS_TOKEN 20
|
|
|
|
#define SPLPAR_MAXLENGTH 1026*(sizeof(char))
|
|
|
|
|
|
|
|
/*
|
|
|
|
* parse_system_parameter_string()
|
|
|
|
* Retrieve the potential_processors, max_entitled_capacity and friends
|
|
|
|
* through the get-system-parameter rtas call. Replace keyword strings as
|
|
|
|
* necessary.
|
|
|
|
*/
|
|
|
|
static void parse_system_parameter_string(struct seq_file *m)
|
|
|
|
{
|
|
|
|
int call_status;
|
|
|
|
|
[PATCH] powerpc/pseries: misc lparcfg fixes
This fixes several problems with the lparcfg code. In case
someone gets a sense of deja-vu, part of this was submitted last Sep, I
thought the changes went in, but either got backed out, or just got
lost.
First, change the local_buffer declaration to be unsigned char *. We
had a bad-math problem in a 2.4 tree which was built with a
"-fsigned-char" parm. I dont believe we ever build with that parm
now-a-days, but to be safe, I'd prefer the declaration be explicit.
Second, fix a bad math calculation for splpar_strlen.
Third, on the rtas_call for get-system-parameter, pass in
RTAS_DATA_BUF_SIZE for the rtas_data_buf size, instead of letting random
data determine the size. Until recently, we've had a sufficiently
large 'random data' value get passed in, so the function just happens to
have worked OK. Now it's getting passed a '0', which causes the
rtas_call to return success, but no data shows up in the buffer.
(oops!). This was found by the LTC test org.
This is in a branch of code that only gets run on SPLPAR systems.
Tested on power5 Lpar.
Signed-off-by: Will Schmidt <willschm@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-03-31 23:07:48 +08:00
|
|
|
unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!local_buffer) {
|
2010-02-06 15:47:20 +08:00
|
|
|
printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__FILE__, __func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock(&rtas_data_buf_lock);
|
|
|
|
memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
|
|
|
|
call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
|
|
|
|
NULL,
|
|
|
|
SPLPAR_CHARACTERISTICS_TOKEN,
|
[PATCH] powerpc/pseries: misc lparcfg fixes
This fixes several problems with the lparcfg code. In case
someone gets a sense of deja-vu, part of this was submitted last Sep, I
thought the changes went in, but either got backed out, or just got
lost.
First, change the local_buffer declaration to be unsigned char *. We
had a bad-math problem in a 2.4 tree which was built with a
"-fsigned-char" parm. I dont believe we ever build with that parm
now-a-days, but to be safe, I'd prefer the declaration be explicit.
Second, fix a bad math calculation for splpar_strlen.
Third, on the rtas_call for get-system-parameter, pass in
RTAS_DATA_BUF_SIZE for the rtas_data_buf size, instead of letting random
data determine the size. Until recently, we've had a sufficiently
large 'random data' value get passed in, so the function just happens to
have worked OK. Now it's getting passed a '0', which causes the
rtas_call to return success, but no data shows up in the buffer.
(oops!). This was found by the LTC test org.
This is in a branch of code that only gets run on SPLPAR systems.
Tested on power5 Lpar.
Signed-off-by: Will Schmidt <willschm@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-03-31 23:07:48 +08:00
|
|
|
__pa(rtas_data_buf),
|
|
|
|
RTAS_DATA_BUF_SIZE);
|
2005-04-17 06:20:36 +08:00
|
|
|
memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
|
|
|
|
spin_unlock(&rtas_data_buf_lock);
|
|
|
|
|
|
|
|
if (call_status != 0) {
|
|
|
|
printk(KERN_INFO
|
|
|
|
"%s %s Error calling get-system-parameter (0x%x)\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__FILE__, __func__, call_status);
|
2005-04-17 06:20:36 +08:00
|
|
|
} else {
|
|
|
|
int splpar_strlen;
|
|
|
|
int idx, w_idx;
|
some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).
Here is a short excerpt of the semantic patch performing
this transformation:
@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@
x =
- kmalloc
+ kzalloc
(E1,E2)
... when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);
@@
expression E1,E2,E3;
@@
- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)
[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 16:49:03 +08:00
|
|
|
char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!workbuffer) {
|
2010-02-06 15:47:20 +08:00
|
|
|
printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__FILE__, __func__, __LINE__);
|
2005-11-10 12:26:20 +08:00
|
|
|
kfree(local_buffer);
|
2005-04-17 06:20:36 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
#ifdef LPARCFG_DEBUG
|
2010-02-06 15:47:20 +08:00
|
|
|
printk(KERN_INFO "success calling get-system-parameter\n");
|
2005-04-17 06:20:36 +08:00
|
|
|
#endif
|
[PATCH] powerpc/pseries: misc lparcfg fixes
This fixes several problems with the lparcfg code. In case
someone gets a sense of deja-vu, part of this was submitted last Sep, I
thought the changes went in, but either got backed out, or just got
lost.
First, change the local_buffer declaration to be unsigned char *. We
had a bad-math problem in a 2.4 tree which was built with a
"-fsigned-char" parm. I dont believe we ever build with that parm
now-a-days, but to be safe, I'd prefer the declaration be explicit.
Second, fix a bad math calculation for splpar_strlen.
Third, on the rtas_call for get-system-parameter, pass in
RTAS_DATA_BUF_SIZE for the rtas_data_buf size, instead of letting random
data determine the size. Until recently, we've had a sufficiently
large 'random data' value get passed in, so the function just happens to
have worked OK. Now it's getting passed a '0', which causes the
rtas_call to return success, but no data shows up in the buffer.
(oops!). This was found by the LTC test org.
This is in a branch of code that only gets run on SPLPAR systems.
Tested on power5 Lpar.
Signed-off-by: Will Schmidt <willschm@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-03-31 23:07:48 +08:00
|
|
|
splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
|
2005-04-17 06:20:36 +08:00
|
|
|
local_buffer += 2; /* step over strlen value */
|
|
|
|
|
|
|
|
w_idx = 0;
|
|
|
|
idx = 0;
|
|
|
|
while ((*local_buffer) && (idx < splpar_strlen)) {
|
|
|
|
workbuffer[w_idx++] = local_buffer[idx++];
|
|
|
|
if ((local_buffer[idx] == ',')
|
|
|
|
|| (local_buffer[idx] == '\0')) {
|
|
|
|
workbuffer[w_idx] = '\0';
|
|
|
|
if (w_idx) {
|
|
|
|
/* avoid the empty string */
|
|
|
|
seq_printf(m, "%s\n", workbuffer);
|
|
|
|
}
|
|
|
|
memset(workbuffer, 0, SPLPAR_MAXLENGTH);
|
|
|
|
idx++; /* skip the comma */
|
|
|
|
w_idx = 0;
|
|
|
|
} else if (local_buffer[idx] == '=') {
|
|
|
|
/* code here to replace workbuffer contents
|
|
|
|
with different keyword strings */
|
|
|
|
if (0 == strcmp(workbuffer, "MaxEntCap")) {
|
|
|
|
strcpy(workbuffer,
|
|
|
|
"partition_max_entitled_capacity");
|
|
|
|
w_idx = strlen(workbuffer);
|
|
|
|
}
|
|
|
|
if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
|
|
|
|
strcpy(workbuffer,
|
|
|
|
"system_potential_processors");
|
|
|
|
w_idx = strlen(workbuffer);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
kfree(workbuffer);
|
|
|
|
local_buffer -= 2; /* back up over strlen value */
|
|
|
|
}
|
|
|
|
kfree(local_buffer);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return the number of processors in the system.
|
|
|
|
* This function reads through the device tree and counts
|
|
|
|
* the virtual processors, this does not include threads.
|
|
|
|
*/
|
|
|
|
static int lparcfg_count_active_processors(void)
|
|
|
|
{
|
|
|
|
struct device_node *cpus_dn = NULL;
|
|
|
|
int count = 0;
|
|
|
|
|
|
|
|
while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
|
|
|
|
#ifdef LPARCFG_DEBUG
|
2010-02-06 15:47:20 +08:00
|
|
|
printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
|
2005-04-17 06:20:36 +08:00
|
|
|
#endif
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2008-07-24 02:30:58 +08:00
|
|
|
static void pseries_cmo_data(struct seq_file *m)
|
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
unsigned long cmo_faults = 0;
|
|
|
|
unsigned long cmo_fault_time = 0;
|
|
|
|
|
2008-08-16 03:10:18 +08:00
|
|
|
seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
|
|
|
|
|
2008-07-24 02:30:58 +08:00
|
|
|
if (!firmware_has_feature(FW_FEATURE_CMO))
|
|
|
|
return;
|
|
|
|
|
|
|
|
for_each_possible_cpu(cpu) {
|
2010-08-13 04:18:15 +08:00
|
|
|
cmo_faults += lppaca_of(cpu).cmo_faults;
|
|
|
|
cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
|
2008-07-24 02:30:58 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
|
|
|
|
seq_printf(m, "cmo_fault_time_usec=%lu\n",
|
|
|
|
cmo_fault_time / tb_ticks_per_usec);
|
2008-08-16 03:10:18 +08:00
|
|
|
seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
|
|
|
|
seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
|
|
|
|
seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
|
2008-07-24 02:30:58 +08:00
|
|
|
}
|
|
|
|
|
2009-04-01 04:12:44 +08:00
|
|
|
static void splpar_dispatch_data(struct seq_file *m)
|
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
unsigned long dispatches = 0;
|
|
|
|
unsigned long dispatch_dispersions = 0;
|
|
|
|
|
|
|
|
for_each_possible_cpu(cpu) {
|
2010-08-13 04:18:15 +08:00
|
|
|
dispatches += lppaca_of(cpu).yield_count;
|
|
|
|
dispatch_dispersions += lppaca_of(cpu).dispersion_count;
|
2009-04-01 04:12:44 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
seq_printf(m, "dispatches=%lu\n", dispatches);
|
|
|
|
seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
|
|
|
|
}
|
|
|
|
|
2010-04-01 05:39:24 +08:00
|
|
|
static void parse_em_data(struct seq_file *m)
|
|
|
|
{
|
|
|
|
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
|
|
|
|
|
|
|
|
if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
|
|
|
|
seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
|
|
|
|
}
|
|
|
|
|
2006-06-29 13:07:42 +08:00
|
|
|
static int pseries_lparcfg_data(struct seq_file *m, void *v)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
int partition_potential_processors;
|
|
|
|
int partition_active_processors;
|
|
|
|
struct device_node *rtas_node;
|
2006-07-12 13:35:54 +08:00
|
|
|
const int *lrdrp = NULL;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-04-24 11:50:55 +08:00
|
|
|
rtas_node = of_find_node_by_path("/rtas");
|
2006-02-16 11:40:44 +08:00
|
|
|
if (rtas_node)
|
2007-04-03 20:26:41 +08:00
|
|
|
lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (lrdrp == NULL) {
|
2005-11-11 20:04:40 +08:00
|
|
|
partition_potential_processors = vdso_data->processorCount;
|
2005-04-17 06:20:36 +08:00
|
|
|
} else {
|
|
|
|
partition_potential_processors = *(lrdrp + 4);
|
|
|
|
}
|
2007-04-24 11:50:55 +08:00
|
|
|
of_node_put(rtas_node);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
partition_active_processors = lparcfg_count_active_processors();
|
|
|
|
|
2005-08-03 12:35:25 +08:00
|
|
|
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
/* this call handles the ibm,get-system-parameter contents */
|
|
|
|
parse_system_parameter_string(m);
|
2008-07-24 02:25:16 +08:00
|
|
|
parse_ppp_data(m);
|
2008-07-24 02:27:30 +08:00
|
|
|
parse_mpp_data(m);
|
2011-05-04 14:01:20 +08:00
|
|
|
parse_mpp_x_data(m);
|
2008-07-24 02:30:58 +08:00
|
|
|
pseries_cmo_data(m);
|
2009-04-01 04:12:44 +08:00
|
|
|
splpar_dispatch_data(m);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-24 02:25:16 +08:00
|
|
|
seq_printf(m, "purr=%ld\n", get_purr());
|
2005-04-17 06:20:36 +08:00
|
|
|
} else { /* non SPLPAR case */
|
|
|
|
|
|
|
|
seq_printf(m, "system_active_processors=%d\n",
|
|
|
|
partition_potential_processors);
|
|
|
|
|
|
|
|
seq_printf(m, "system_potential_processors=%d\n",
|
|
|
|
partition_potential_processors);
|
|
|
|
|
|
|
|
seq_printf(m, "partition_max_entitled_capacity=%d\n",
|
|
|
|
partition_potential_processors * 100);
|
|
|
|
|
|
|
|
seq_printf(m, "partition_entitled_capacity=%d\n",
|
|
|
|
partition_active_processors * 100);
|
|
|
|
}
|
|
|
|
|
|
|
|
seq_printf(m, "partition_active_processors=%d\n",
|
|
|
|
partition_active_processors);
|
|
|
|
|
|
|
|
seq_printf(m, "partition_potential_processors=%d\n",
|
|
|
|
partition_potential_processors);
|
|
|
|
|
2010-08-13 04:18:15 +08:00
|
|
|
seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2009-08-28 20:06:29 +08:00
|
|
|
seq_printf(m, "slb_size=%d\n", mmu_slb_size);
|
|
|
|
|
2010-04-01 05:39:24 +08:00
|
|
|
parse_em_data(m);
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-07-24 02:25:16 +08:00
|
|
|
static ssize_t update_ppp(u64 *entitlement, u8 *weight)
|
|
|
|
{
|
2008-07-24 02:28:05 +08:00
|
|
|
struct hvcall_ppp_data ppp_data;
|
|
|
|
u8 new_weight;
|
2008-07-24 02:25:16 +08:00
|
|
|
u64 new_entitled;
|
|
|
|
ssize_t retval;
|
|
|
|
|
|
|
|
/* Get our current parameters */
|
2008-07-24 02:28:05 +08:00
|
|
|
retval = h_get_ppp(&ppp_data);
|
2008-07-24 02:25:16 +08:00
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
if (entitlement) {
|
2008-07-24 02:28:05 +08:00
|
|
|
new_weight = ppp_data.weight;
|
2008-07-24 02:25:16 +08:00
|
|
|
new_entitled = *entitlement;
|
|
|
|
} else if (weight) {
|
|
|
|
new_weight = *weight;
|
2008-07-24 02:28:05 +08:00
|
|
|
new_entitled = ppp_data.entitlement;
|
2008-07-24 02:25:16 +08:00
|
|
|
} else
|
|
|
|
return -EINVAL;
|
|
|
|
|
2009-01-06 22:26:03 +08:00
|
|
|
pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
|
2008-07-31 03:29:03 +08:00
|
|
|
__func__, ppp_data.entitlement, ppp_data.weight);
|
2008-07-24 02:25:16 +08:00
|
|
|
|
2009-01-06 22:26:03 +08:00
|
|
|
pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
|
2008-07-31 03:29:03 +08:00
|
|
|
__func__, new_entitled, new_weight);
|
2008-07-24 02:25:16 +08:00
|
|
|
|
|
|
|
retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2008-07-24 02:27:30 +08:00
|
|
|
/**
|
|
|
|
* update_mpp
|
|
|
|
*
|
|
|
|
* Update the memory entitlement and weight for the partition. Caller must
|
|
|
|
* specify either a new entitlement or weight, not both, to be updated
|
|
|
|
* since the h_set_mpp call takes both entitlement and weight as parameters.
|
|
|
|
*/
|
|
|
|
static ssize_t update_mpp(u64 *entitlement, u8 *weight)
|
|
|
|
{
|
|
|
|
struct hvcall_mpp_data mpp_data;
|
|
|
|
u64 new_entitled;
|
|
|
|
u8 new_weight;
|
|
|
|
ssize_t rc;
|
|
|
|
|
2008-07-24 02:31:52 +08:00
|
|
|
if (entitlement) {
|
|
|
|
/* Check with vio to ensure the new memory entitlement
|
|
|
|
* can be handled.
|
|
|
|
*/
|
|
|
|
rc = vio_cmo_entitlement_update(*entitlement);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2008-07-24 02:27:30 +08:00
|
|
|
rc = h_get_mpp(&mpp_data);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
if (entitlement) {
|
|
|
|
new_weight = mpp_data.mem_weight;
|
|
|
|
new_entitled = *entitlement;
|
|
|
|
} else if (weight) {
|
|
|
|
new_weight = *weight;
|
|
|
|
new_entitled = mpp_data.entitled_mem;
|
|
|
|
} else
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
|
2008-07-31 03:29:03 +08:00
|
|
|
__func__, mpp_data.entitled_mem, mpp_data.mem_weight);
|
2008-07-24 02:27:30 +08:00
|
|
|
|
2009-01-06 22:26:03 +08:00
|
|
|
pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
|
2008-07-31 03:29:03 +08:00
|
|
|
__func__, new_entitled, new_weight);
|
2008-07-24 02:27:30 +08:00
|
|
|
|
|
|
|
rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Interface for changing system parameters (variable capacity weight
|
|
|
|
* and entitled capacity). Format of input is "param_name=value";
|
|
|
|
* anything after value is ignored. Valid parameters at this time are
|
|
|
|
* "partition_entitled_capacity" and "capacity_weight". We use
|
|
|
|
* H_SET_PPP to alter parameters.
|
|
|
|
*
|
|
|
|
* This function should be invoked only on systems with
|
|
|
|
* FW_FEATURE_SPLPAR.
|
|
|
|
*/
|
|
|
|
static ssize_t lparcfg_write(struct file *file, const char __user * buf,
|
|
|
|
size_t count, loff_t * off)
|
|
|
|
{
|
2008-07-24 03:10:46 +08:00
|
|
|
int kbuf_sz = 64;
|
|
|
|
char kbuf[kbuf_sz];
|
2005-04-17 06:20:36 +08:00
|
|
|
char *tmp;
|
|
|
|
u64 new_entitled, *new_entitled_ptr = &new_entitled;
|
|
|
|
u8 new_weight, *new_weight_ptr = &new_weight;
|
2008-07-24 03:10:46 +08:00
|
|
|
ssize_t retval;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2012-03-16 02:18:00 +08:00
|
|
|
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
|
2007-02-06 08:14:05 +08:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-07-24 03:10:46 +08:00
|
|
|
if (count > kbuf_sz)
|
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (copy_from_user(kbuf, buf, count))
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EFAULT;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
kbuf[count - 1] = '\0';
|
|
|
|
tmp = strchr(kbuf, '=');
|
|
|
|
if (!tmp)
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
*tmp++ = '\0';
|
|
|
|
|
|
|
|
if (!strcmp(kbuf, "partition_entitled_capacity")) {
|
|
|
|
char *endp;
|
|
|
|
*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
|
|
|
|
if (endp == tmp)
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2008-07-24 02:25:16 +08:00
|
|
|
|
|
|
|
retval = update_ppp(new_entitled_ptr, NULL);
|
2005-04-17 06:20:36 +08:00
|
|
|
} else if (!strcmp(kbuf, "capacity_weight")) {
|
|
|
|
char *endp;
|
|
|
|
*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
|
|
|
|
if (endp == tmp)
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-24 02:25:16 +08:00
|
|
|
retval = update_ppp(NULL, new_weight_ptr);
|
2008-07-24 02:27:30 +08:00
|
|
|
} else if (!strcmp(kbuf, "entitled_memory")) {
|
|
|
|
char *endp;
|
|
|
|
*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
|
|
|
|
if (endp == tmp)
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2008-07-24 02:27:30 +08:00
|
|
|
|
|
|
|
retval = update_mpp(new_entitled_ptr, NULL);
|
|
|
|
} else if (!strcmp(kbuf, "entitled_memory_weight")) {
|
|
|
|
char *endp;
|
|
|
|
*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
|
|
|
|
if (endp == tmp)
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2008-07-24 02:27:30 +08:00
|
|
|
|
|
|
|
retval = update_mpp(NULL, new_weight_ptr);
|
2008-07-24 02:25:16 +08:00
|
|
|
} else
|
2008-07-24 03:10:46 +08:00
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-03-30 20:49:40 +08:00
|
|
|
if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
|
2005-04-17 06:20:36 +08:00
|
|
|
retval = count;
|
2006-03-30 20:49:40 +08:00
|
|
|
} else if (retval == H_BUSY) {
|
2005-04-17 06:20:36 +08:00
|
|
|
retval = -EBUSY;
|
2006-03-30 20:49:40 +08:00
|
|
|
} else if (retval == H_HARDWARE) {
|
2005-04-17 06:20:36 +08:00
|
|
|
retval = -EIO;
|
2006-03-30 20:49:40 +08:00
|
|
|
} else if (retval == H_PARAMETER) {
|
2005-04-17 06:20:36 +08:00
|
|
|
retval = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2006-06-29 13:07:42 +08:00
|
|
|
static int lparcfg_data(struct seq_file *m, void *v)
|
|
|
|
{
|
|
|
|
struct device_node *rootdn;
|
|
|
|
const char *model = "";
|
|
|
|
const char *system_id = "";
|
|
|
|
const char *tmp;
|
2006-07-12 13:35:54 +08:00
|
|
|
const unsigned int *lp_index_ptr;
|
|
|
|
unsigned int lp_index = 0;
|
2006-06-29 13:07:42 +08:00
|
|
|
|
2010-02-06 15:47:20 +08:00
|
|
|
seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
|
2006-06-29 13:07:42 +08:00
|
|
|
|
2007-04-24 11:50:55 +08:00
|
|
|
rootdn = of_find_node_by_path("/");
|
2006-06-29 13:07:42 +08:00
|
|
|
if (rootdn) {
|
2007-04-03 20:26:41 +08:00
|
|
|
tmp = of_get_property(rootdn, "model", NULL);
|
2012-03-16 02:18:00 +08:00
|
|
|
if (tmp)
|
2006-06-29 13:07:42 +08:00
|
|
|
model = tmp;
|
2007-04-03 20:26:41 +08:00
|
|
|
tmp = of_get_property(rootdn, "system-id", NULL);
|
2012-03-16 02:18:00 +08:00
|
|
|
if (tmp)
|
2006-06-29 13:07:42 +08:00
|
|
|
system_id = tmp;
|
2007-04-03 20:26:41 +08:00
|
|
|
lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
|
|
|
|
NULL);
|
2006-06-29 13:07:42 +08:00
|
|
|
if (lp_index_ptr)
|
|
|
|
lp_index = *lp_index_ptr;
|
2007-04-24 11:50:55 +08:00
|
|
|
of_node_put(rootdn);
|
2006-06-29 13:07:42 +08:00
|
|
|
}
|
|
|
|
seq_printf(m, "serial_number=%s\n", system_id);
|
|
|
|
seq_printf(m, "system_type=%s\n", model);
|
|
|
|
seq_printf(m, "partition_id=%d\n", (int)lp_index);
|
|
|
|
|
|
|
|
return pseries_lparcfg_data(m, v);
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int lparcfg_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return single_open(file, lparcfg_data, NULL);
|
|
|
|
}
|
|
|
|
|
2008-05-08 12:27:19 +08:00
|
|
|
static const struct file_operations lparcfg_fops = {
|
2005-11-11 10:53:11 +08:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.read = seq_read,
|
2007-02-06 08:14:05 +08:00
|
|
|
.write = lparcfg_write,
|
2005-11-11 10:53:11 +08:00
|
|
|
.open = lparcfg_open,
|
|
|
|
.release = single_release,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-16 00:52:59 +08:00
|
|
|
.llseek = seq_lseek,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
2008-05-08 12:27:19 +08:00
|
|
|
static int __init lparcfg_init(void)
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2005-04-17 06:20:36 +08:00
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{
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struct proc_dir_entry *ent;
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2011-07-24 15:36:29 +08:00
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umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
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2005-04-17 06:20:36 +08:00
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/* Allow writing if we have FW_FEATURE_SPLPAR */
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2012-03-16 02:18:00 +08:00
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if (firmware_has_feature(FW_FEATURE_SPLPAR))
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2005-04-17 06:20:36 +08:00
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mode |= S_IWUSR;
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2009-09-25 03:29:13 +08:00
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ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
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2008-04-29 16:02:26 +08:00
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if (!ent) {
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2009-09-25 03:29:13 +08:00
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printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
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2005-04-17 06:20:36 +08:00
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return -EIO;
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}
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proc_ppc64_lparcfg = ent;
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return 0;
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}
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2008-05-08 12:27:19 +08:00
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static void __exit lparcfg_cleanup(void)
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2005-04-17 06:20:36 +08:00
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{
|
2007-12-05 00:03:49 +08:00
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|
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if (proc_ppc64_lparcfg)
|
2005-04-17 06:20:36 +08:00
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remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
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}
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module_init(lparcfg_init);
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module_exit(lparcfg_cleanup);
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MODULE_DESCRIPTION("Interface for LPAR configuration data");
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MODULE_AUTHOR("Dave Engebretsen");
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MODULE_LICENSE("GPL");
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