linux/arch/tile/kernel/time.c, branch v3.13

Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2013-09-06T18:14:33Z

Pull Tile arch updates from Chris Metcalf: "These changes bring in a bunch of new functionality that has been maintained internally at Tilera over the last year, plus other stray bits of work that I've taken into the tile tree from other folks. The changes include some PCI root complex work, interrupt-driven console support, support for performing fast-path unaligned data fixups by kernel-based JIT code generation, CONFIG_PREEMPT support, vDSO support for gettimeofday(), a serial driver for the tilegx on-chip UART, KGDB support, more optimized string routines, support for ftrace and kprobes, improved ASLR, and many bug fixes. We also remove support for the old TILE64 chip, which is no longer buildable" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (85 commits) tile: refresh tile defconfig files tile: rework tile PCI RC: make default consistent DMA mask 32-bit tile: add null check for kzalloc in tile/kernel/setup.c tile: make __write_once a synonym for __read_mostly tile: remove support for TILE64 tile: use asm-generic/bitops/builtin-*.h tile: eliminate no-op "noatomichash" boot argument tile: use standard tile_bundle_bits type in traps.c tile: simplify code referencing hypervisor API addresses tile: change to in comments tile: mark pcibios_init() as __init tile: check for correct compiler earlier in asm-offsets.c tile: use standard 'generic-y' model for tile: use asm-generic version of tile PCI RC: add comment about "PCI hole" problem tile: remove DEBUG_EXTRA_FLAGS kernel config option tile: add virt_to_kpte() API and clean up and document behavior tile: support FRAME_POINTER tile: support reporting Tilera hypervisor statistics ...

tile: implement gettimeofday() via vDSO

2013-08-13T20:26:21Z

This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: Chris Metcalf

tile: delete __cpuinit usage from all tile files

2013-07-14T23:36:54Z

The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/tile uses of the __cpuinit macros from all C files. Currently tile does not have any __CPUINIT used in assembly files. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Chris Metcalf Signed-off-by: Paul Gortmaker

tile: ns2cycles should use __raw_get_cpu_var

2013-03-26T17:52:16Z

ns2cycles use per_cpu variables, and will, eventually, find its way into smp_processor_id(). This is not safe in a preemptible kernel; preemption should ideally be disabled. BUG: using smp_processor_id() in preemptible [00000000] code: systemd-modules/367 caller is ns2cycles+0x40/0xb8 Starting stack dump of tid 367, pid 367 (systemd-modules) on cpu 2 at cycle 20969956421 frame 0: 0xfffffff70004b860 dump_stack+0x0/0x20 (sp 0xfffffe407993fa90) frame 1: 0xfffffff7006abc28 debug_smp_processor_id+0x1a8/0x1e0 (sp 0xfffffe407993fa90) frame 2: 0xfffffff7004d7b40 ns2cycles+0x40/0xb8 (sp 0xfffffe407993fab8) frame 3: 0xfffffff7004dc578 __ndelay+0x38/0x80 (sp 0xfffffe407993fae0) However, in this case: - the frequency is the same accross all cores - we use the data read-only - we do not scale the frequency Which means that we can use the __raw_get_cpu_var instead. Signed-off-by: Henrik Austad Signed-off-by: Chris Metcalf

clocksource: tile: convert to use clocksource_register_hz

2011-06-03T21:26:21Z

Convert tile to use clocksource_register_hz. CC: Thomas Gleixner Signed-off-by: John Stultz Signed-off-by: Chris Metcalf

arch/tile: various header improvements for building drivers

2011-05-04T18:40:54Z

This change adds a number of missing headers in asm (fb.h, parport.h, serial.h, and vga.h) using the minimal generic versions. It also adds a number of missing interfaces that showed up as build failures when trying to build various drivers not normally included in the "tile" distribution: ioremap_wc(), memset_io(), io{read,write}{16,32}be(), virt_to_bus(), bus_to_virt(), irq_canonicalize(), __pte(), __pgd(), and __pmd(). I also added a cast in virt_to_page() since not all callers pass a pointer. I fixed to properly include a __KERNEL__ guard for the __ARCH_WANT_STAT64 symbol, and to use __builtin_bswap32() even for our 64-bit architecture, since the same code is produced. I added an export for get_cycles(), since it's used in some modules. And I made properly include the __KERNEL__ guard, even though it's not yet exported, since it likely will be soon. Signed-off-by: Chris Metcalf

arch/tile: fix __ndelay etc to work better

2011-03-01T21:20:04Z

The current implementations of __ndelay and __udelay call a hypervisor service to delay, but the hypervisor service isn't actually implemented very well, and the consensus is that Linux should handle figuring this out natively and not use a hypervisor service. By converting nanoseconds to cycles, and then spinning until the cycle counter reaches the desired cycle, we get several benefits: first, we are sensitive to the actual clock speed; second, we use less power by issuing a slow SPR read once every six cycles while we delay; and third, we properly handle the case of an interrupt by exiting at the target time rather than after some number of cycles. Signed-off-by: Chris Metcalf

arch/tile: bomb raw_local_irq_ to arch_local_irq_

2010-11-01T19:30:42Z

This completes the tile migration to the new naming scheme for the architecture-specific irq management code. Signed-off-by: Chris Metcalf

arch/tile: Use separate, better minsec values for clocksource and sched_clock.

2010-08-13T12:24:22Z

We were using the same 5-sec minsec for the clocksource and sched_clock that we were using for the clock_event_device. For the clock_event_device that's exactly right since it has a short maximum countdown time. But for sched_clock we want to avoid wraparound when converting from ticks to nsec over a much longer window, so we force a shift of 10. And for clocksource it seems dodgy to use a 5-sec minsec as well, so we copy some other platforms and force a shift of 22. Signed-off-by: Chris Metcalf

arch/tile: Miscellaneous cleanup changes.

2010-07-06T17:41:51Z

This commit is primarily changes caused by reviewing "sparse" and "checkpatch" output on our sources, so is somewhat noisy, since things like "printk() -> pr_err()" (or whatever) throughout the codebase tend to get tedious to read. Rather than trying to tease apart precisely which things changed due to which type of code review, this commit includes various cleanups in the code: - sparse: Add declarations in headers for globals. - sparse: Fix __user annotations. - sparse: Using gfp_t consistently instead of int. - sparse: removing functions not actually used. - checkpatch: Clean up printk() warnings by using pr_info(), etc.; also avoid partial-line printks except in bootup code. - checkpatch: Use exposed structs rather than typedefs. - checkpatch: Change some C99 comments to C89 comments. In addition, a couple of minor other changes are rolled in to this commit: - Add support for a "raise" instruction to cause SIGFPE, etc., to be raised. - Remove some compat code that is unnecessary when we fully eliminate some of the deprecated syscalls from the generic syscall ABI. - Update the tile_defconfig to reflect current config contents. Signed-off-by: Chris Metcalf Acked-by: Arnd Bergmann