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2010-08-04CRIS: Simple insn reschedule to avoid interlocks.Jesper Nilsson
Brings down the CPI from ~1.5 to ~1.1. Signed-off-by: Edgar Iglesias <Edgar.Iglesias@axis.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: Add debug for assembler functionsJesper Nilsson
Signed-off-by: Edgar Iglesias <Edgar.Iglesias@axis.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: Correct address of the romfs in boot imageJesper Nilsson
The romfs should land after __init_end Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: Fasttimer: Remove obsolete ifdefJesper Nilsson
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: Better link to rs485 in helpJesper Nilsson
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: Remove CVS tag.Jesper Nilsson
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: v10: remove all BKL usageJesper Nilsson
We don't need to take the BKL here. Also fixes compile error after last commit (smp_lock.h was not included) Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04CRIS: gpio: don't call copy_to_user()/copy_from_user() while holding spinlocksJesper Nilsson
copy_to_user()/copy_from_user() must not be used with spinlocks held. Move locks inside each case so we have better control of when the locks are held. Also, since we use spinlocks, we don't need to hold the BKL, so remove it. Reported-by: Kulikov Vasiliy <segooon@gmail.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04arch/cris: Remove unnecessary casts of private_dataJoe Perches
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04cris: autoconvert trivial BKL users to private mutexJesper Nilsson
All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04cris: Pushdown the bkl from ioctlJesper Nilsson
From: Frederic Weisbecker <fweisbec@gmail.com> Pushdown the bkl to the remaining drivers using the deprecated .ioctl. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: John Kacur <jkacur@redhat.com>
2010-08-04CRIS: invoke oom-killer from page faultJesper Nilsson
As explained in commit 1c0fe6e3bd, we want to call the architecture independent oom killer when getting an unexplained OOM from handle_mm_fault, rather than simply killing current. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Mikael Starvik <starvik@axis.com>
2010-08-04CRIS: GENERIC_TIME fixesJesper Nilsson
GENERIC_TIME was not functional for CRIS, giving random backward time jumps. For CRISv32 implement a new clocksource using the free running counter and ditch the arch_gettimeoffset. The random time jumps still existed, but turned out to be the write_seqlock which was missing around our do_timer() call. So switch over to GENERIC_TIME using the clocksource for CRISv32. CRISv10 doesn't have the free running counter needed for the clocksource trick, but we can still use GENERIC_TIME with arch_gettimeoffset. Unfortunately, there were problems in using the prescaler register to timer0 for the gettimeoffset calculation, so it is now ignored, making our resolution worse by the tune of 40usec (0.4%) worst case. At the same time, clean up some formatting and use NSEC_PER_SEC instead of 1000000000. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
2010-08-04omap: Fix DEBUG_LL uart to access phys addr when MMU isn't enableJason Wang
Now we use a memory address to store the debug port info, So we need to read/write this address when we choose DEBUG_LL. When MMU isn't enable(I.E. the begining part of init stage of the linux kernel boot), we need to access physical address instead of virtual address, otherwise the kernel will crash. Signed-off-by: Jason Wang <jason77.wang@gmail.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
2010-08-04microblaze: Add KGDB supportMichal Simek
Kgdb uses brki r16, 0x18 instruction to call low level _debug_exception function which save current state to pt_regs and call microblaze_kgdb_break function. _debug_exception should be called only from the kernel space. User space calling is not supported because user application debugging uses different handling. pt_regs_to_gdb_regs loads additional special registers which can't be changed * Enable KGDB in Kconfig * Remove ancient not-tested KGDB support * Remove ancient _debug_exception code from entry.S Only MMU KGDB support is supported. Signed-off-by: Michal Simek <monstr@monstr.eu> CC: Jason Wessel <jason.wessel@windriver.com> CC: John Williams <john.williams@petalogix.com> CC: Edgar E. Iglesias <edgar.iglesias@petalogix.com> CC: linux-kernel@vger.kernel.org Acked-by: Jason Wessel <jason.wessel@windriver.com>
2010-08-04microblaze: Support brki rX, 0x18 for user application debuggingMichal Simek
This is the first patch which add support for user application debugging through brki rX, 0x18 vector. This patch has side effect which also remove security issue to use brki rX, 0x18 to freeze kernel. Support for old gdb support via priviledged exception (brk r0, r0) is still there. It will be remove in future. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Remove nop after MSRCLR/SET, MTS, MFS instructionsMichal Simek
We need to save instruction and the latest Microblaze shouldn't have any problem with it. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Simplify syscall rutineMichal Simek
Syscall can be called only from userspace that's why we don't need to check which space kernel come from. Kernel syscall calling is not check and shouldn't come throught this part of code. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Move PT_MODE saving to delay slotMichal Simek
We can save one more instruction if PT_MODE is saved in delay slot Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Fix _interrupt functionMichal Simek
Save instructions by using delay slot and clear UMS only if kernel comes from user space. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Fix _user_exception functionMichal Simek
Saving some instructions. Clear VMS bit if kernel comes from kernel space. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Put together addik instructionsMichal Simek
Saving instructions by adding 2/3 addik instructions to one. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Use delay slot in syscall macrosMichal Simek
Saving instruction with delay slot usage. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Save kernel mode in delay slotMichal Simek
This change save one instruction if kernel comes from kernel space. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Do not mix register saving and mode settingMichal Simek
Separate reg saving and mode setting. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Move SAVE_STATE upwardMichal Simek
SAVE_STATE macro could be used by other rutines too. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: entry.S: Macro optimizationMichal Simek
We are not working with values from MSR that's why we can discard it and use r11 for different purpose without saving/restoring. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Optimize hw exception rutineMichal Simek
Remove set_vms because UMS is cleared and VMS is already setup. Optimize function calling which save one additional instruction. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Implement clear_ums macro and fix SAVE_STATE macroMichal Simek
VMS is always setup because VM mode was before exception/syscall/interrupt. Kernel continues in kernel mode that's why we have to clear UMS bit if kernel comes from user space. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Remove additional setup for kernel_modeMichal Simek
PT_MODE stores information if kernel comes from user or kernel space. If come from user space, PT_MODE contains 0. If come from kernel store, PT_MODE contains non zero value. We don't need to save value 1. I am using r1 register which contains non zero value. This change save one additional instruction. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Optimize SAVE_STATE macroMichal Simek
SAVE_STATE macro could be used for user_exception or interrupt functions. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Remove additional loadingMichal Simek
We don't need to save r0 to PT_R0. It could be additional operation. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Completely remove working with R11 registerMichal Simek
We don't need to save R11 register. There is easy way to use only R1 which is saved and restore later. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Do not setup BIP in _debug_exceptionMichal Simek
BIP is already setup. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Simplify _debug_exception functionMichal Simek
Keep together all arguments for send_sig function. Move returning address to delay slot which is executed. Remove additional send_sig loading. I am using IMM part of rtbd instruction with r0. old solution: addik r11, r0, send_sig rtbd r11, 0 nop new solution: rtbd r0, send_sig nop There is one instruction saving. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Optimize SAVE_STATE macroMichal Simek
It is necessary to setup BIP and EE and clear EIP only for unaligned exception handler. The rest of hw exception handlers don't require it. HW exception occured and we are not in virtual mode. That's why we can do operations protected by EIP. Interrupt, next hw exception or syscall can't occur. EIP is cleared by rted. This change speedup page_fault hw exception handler which is critical path. There is also necessary to save R11 content before flag setup for unaligned exception. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: trivial: Use la insted of addikMichal Simek
la is translated to addik by toolchain. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: remove enable_irq from SAVE_STATE macroMichal Simek
SAVE_STATE macro is used in hw exceptions high level handling functions. Hw exception doesn't disable IRQ that's why we don't need to reenable it. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Move stack backup to SAVE_STATE macroMichal Simek
Remove code duplicity and move it to SAVE_STATE macro. There is no impact on performance. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Move BIP setup to the end of ret_from_trap/ret_from_excMichal Simek
We don't need to protect by BIP whole ret_from_trap/ret_from_exc code. Only restoring from user/hw exception should be covered. If BIP is setup, IRQ can't occur. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Remove PER_CPU(KM) variableMichal Simek
There is a way howto remove Kernel Mode variable. It is easier to parse UMS bit in MSR to find out if I come from kernel or user space. Loading MSR content should be in one cycle and loading PER_CPU variable depends on memory state. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Optimize clear_vms_ums macroMichal Simek
We can save two instruction when MSR_VMS and MSR_UMS are setup in one instruction. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Save and restore r3/r4 in SAVE/RESTORE_REGS macrosMichal Simek
Save and restore R3/R4 registers in macros. This change help to cleanup entry.S. In ret_from_trap function we are saving returning value from syscall to pt_regs on stack that's why we don't need to save and restore these values before kernel functions (schedule, do_signal). Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Fix VM_ON and VM_OFF macrosMichal Simek
Jump behind macro. We don't want to execute nop instruction again. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Do not use _start in vmlinuxMichal Simek
_start symbol stores physical address where kernel is. Gdb uses this symbol for their purpose that's why we have to rename it. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Cleanup boot/MakefileMichal Simek
Remove spaces and use tabs instead. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Fix number of pvr regsMichal Simek
Microblaze has only 11 pvr regs according manual. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Decrease time shifting valuesMichal Simek
Lower shifting values ensure that shifted 32bit counter value doesn't exceed 64bit cycle variable too fast. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: Enable early printk only for uartliteMichal Simek
Microblaze has support for early printk. The second serial driver (uart16550/8250) has no microblaze support for early printk. Signed-off-by: Michal Simek <monstr@monstr.eu>
2010-08-04microblaze: remove unused HAVE_ARCH_PCI_SET_DMA_MASKFUJITA Tomonori
HAVE_ARCH_PCI_SET_DMA_MASK was removed in 2.6.34 (no architecture has the own implementation of pci_set_dma_mask). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Michal Simek <monstr@monstr.eu>