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2009-12-17MIPS: Collect FPU emulator statistics per-CPU.David Daney
On SMP systems, the collection of statistics can cause cache line bouncing in the lines associated with the counters. Also there are races incrementing the counters on multiple CPUs. To fix both problems, we collect the statistics in per-CPU variables, and add them up in the debugfs read operation. As a test I ran the LTP float_bessel test on a 12 CPU Octeon system. Without CONFIG_DEBUG_FS : 2602 seconds. With CONFIG_DEBUG_FS: 2640 seconds. With non-cpu-local atomic statistics: 14569 seconds. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-07Merge branch 'for-next' into for-linusJiri Kosina
Conflicts: kernel/irq/chip.c
2009-12-04tree-wide: fix assorted typos all over the placeAndré Goddard Rosa
That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-11-13MIPS: Fix emulation of 64-bit FPU on FPU-less 64-bit CPUs.David Daney
Running a 64-bit kernel on a 64-bit CPU without an FPU would cause the emulator to run in 32-bit mode. The c0_Status.FR bit is wired to zero on systems without an FPU, so using that bit to decide how the emulator behaves doesn't allow for proper emulation on 64-bit FPU-less processors. Instead, we need to select the emulator mode based on the user-space ABI. Since the thread flag TIF_32BIT_REGS is used to set c0_Status.FR, we can just use it to decide if the emulator should be in 32-bit or 64-bit mode. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-11-02MIPS: Fix abs.[sd] and neg.[sd] emulation for NaN operandsNigel Stephens
This patch ensures that the sign bit is always updated for NaN operands. Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-10-30MIPS: Switch FPU emulator trap to BREAK instruction.Ralf Baechle
Arguably using the address error handler has always been ugly. But with processors that handle unaligned loads and stores in hardware the current mechanism ceases to work so switch it to a BREAK instruction and allocate break code 514 to the FPU emulator. Yoichi Yuasa provided a build fix for CONFIG_BUG=n. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
2008-10-27MIPS: Fix debugfs_create_*'s error checking method for arch/mips/math-emu/Zhaolei
debugfs_create_*() returns NULL on error. Make its caller debugfs_fpuemu return -ENODEV on error. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-07-20[MIPS] Fix missing prototypes in asm/fpu.hDmitri Vorobiev
While building the Malta defconfig, sparse spat the following warnings: >>>>>>>>>>>>>>>>>> arch/mips/math-emu/kernel_linkage.c:31:6: warning: symbol 'fpu_emulator_init_fpu' was not declared. Should it be static? arch/mips/math-emu/kernel_linkage.c:54:5: warning: symbol 'fpu_emulator_save_context' was not declared. Should it be static? arch/mips/math-emu/kernel_linkage.c:68:5: warning: symbol 'fpu_emulator_restore_context' was not declared. Should it be static? >>>>>>>>>>>>>>>>>> This patch fixes these errors by adding the proper prototypes to the include/asm-mips/fpu.h header, and actually using this header in the sparse-spotted source file. Build-tested with Malta defconfig. Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.fi> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-04-28[MIPS] replace __inline with inlineHarvey Harrison
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-11-26[MIPS] Compliment va_start() with va_end().Richard Knutsson
Signed-off-by: Richard Knutsson <ricknu-0@student.ltu.se> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11[MIPS] checkfiles: Fix "need space after that ','" errors.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11[MIPS] Fix "no space between function name and open parenthesis" warnings.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-31[MIPS] Use -Werror on subdirectories which build cleanly.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-13[MIPS] Add some __user tagsAtsushi Nemoto
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-13[MIPS] math-emu minor cleanupAtsushi Nemoto
Declaring emulpc and contpc as "unsigned long" can get rid of some casts. This also get rid of some sparse warnings. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10[MIPS] Add debugfs files to show fpuemu statisticsAtsushi Nemoto
Export contents of struct mips_fpu_emulator_stats via debugfs. There is no way to read these statistics for now but they (at least the "emulated" count) might be sometimes useful for performance tuning on FPU-less CPUs. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-05-08header cleaning: don't include smp_lock.h when not usedRandy Dunlap
Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-17[MIPS] FPU ownership management & preemption fixesAtsushi Nemoto
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-10-09[MIPS] Make sure cpu_has_fpu is used only in atomic contextAtsushi Nemoto
Make sure cpu_has_fpu (which uses smp_processor_id()) is used only in atomic context. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-19[MIPS] Unify mips_fpu_soft_struct and mips_fpu_hard_structs.Atsushi Nemoto
The struct mips_fpu_soft_struct and mips_fpu_hard_struct are completely same now and the kernel fpu emulator assumes that. This patch unifies them to mips_fpu_struct and get rid of mips_fpu_union. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-06-06[MIPS] Fix compiler warnings (field width, unused variable)Atsushi Nemoto
Fix following warnings: linux/arch/mips/kernel/setup.c:432: warning: field width is not type int (arg 2) linux/arch/mips/kernel/setup.c:432: warning: field width is not type int (arg 4) linux/arch/mips/kernel/syscall.c:279: warning: unused variable `len' linux/arch/mips/kernel/syscall.c:280: warning: unused variable `name' linux/arch/mips/math-emu/dp_fint.c:32: warning: unused variable `xc' linux/arch/mips/math-emu/dp_flong.c:32: warning: unused variable `xc' linux/arch/mips/math-emu/sp_fint.c:32: warning: unused variable `xc' linux/arch/mips/math-emu/sp_flong.c:32: warning: unused variable `xc' (original patch by Atsushi, slight changes to the setup.c part by me.) Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-02-07[MIPS] ieee754[sd]p_neg workaroundAtsushi Nemoto
It looks glibc's pow() assumes an unary '-' operation for any number (including NaNs) always inverts its sign bit (though IEEE754 does not specify the sign bit for NaNs). This patch make the kernel math-emu emulates real MIPS neg.[ds] instruction. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-01-10MIPS: FP: Remove silly trick to avoid warning.Ralf Baechle
Just doesn't fool a modern compiler anymore. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Get rid of SINGLE_ONLY_FPU. Linux does not support half FPU other thanRalf Baechle
by emulation of a full FPU. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Fix all the get_user / put_user related sparse warnings.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Delete unused ieee754_cname[] and declaration.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Include for prototypes.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Protect against multiple inclusion.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29FPU emulator garbage collection.Ralf Baechle
First argument of fpu_emulator_cop1Handler() was unused. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29GCC bulletproofing: __mips64 is only defined when compiling for 64-bitRalf Baechle
processors. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Now that a struct is the only member left in structRalf Baechle
mips_fpu_emulator_stats cleanup that unnecessary nesting of structs. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Get rid of the eir struct mips_fpu_emulator_private member. It'sRalf Baechle
never initialized been initialized anywhere, just saved to and restored from signal frames so nonsense anyway. As neat side effect of being shared between all processors it was also abusable as a nice covert channel between processes. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Fix preemption and SMP problems in the FP emulator code.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Gross macro abuse. Get rid of gpreg_t, vaddr_t, REG_TO_VA andRalf Baechle
VA_TO_REG. Who ever wrote this apparently did enjoy the C Puzzle Book. ISBN 0201604612, a little old but still fun reading for the next blackout ;) Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-10-29Cleanup fpuemuprivate declarations.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-09-05[PATCH] mips: fix build warningsYoichi Yuasa
This patch has fixed the following warnings. arch/mips/kernel/genex.S:250:5: warning: "CONFIG_64BIT" is not defined arch/mips/math-emu/cp1emu.c:1128:5: warning: "__mips64" is not defined arch/mips/math-emu/cp1emu.c:1206:5: warning: "__mips64" is not defined arch/mips/math-emu/cp1emu.c:1270:5: warning: "__mips64" is not defined arch/mips/math-emu/cp1emu.c:323:5: warning: "__mips64" is not defined arch/mips/math-emu/cp1emu.c:808:5: warning: "__mips64" is not defined arch/mips/math-emu/cp1emu.c:953:5: warning: "__mips64" is not defined arch/mips/mm/tlbex.c:519:5: warning: "CONFIG_64BIT" is not defined include/asm/reg.h:73:5: warning: "CONFIG_64BIT" is not defined Signed-off-by: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-05[PATCH] mips: clean up 32/64-bit configurationRalf Baechle
Start cleaning 32-bit vs. 64-bit configuration. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-16Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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