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* tile: support CONTEXT_TRACKING and thus NOHZ_FULLChris Metcalf2015-04-171-7/+9
| | | | | | | | | | | | | | | | Add the TIF_NOHZ flag appropriately. Add call to user_exit() on entry to do_work_pending() and on entry to syscalls via do_syscall_trace_enter(), and also the top of do_syscall_trace_exit() just because it's done in x86. Add call to user_enter() at the bottom of do_work_pending() once we have no more work to do before returning to userspace. Wrap all the trap code in exception_enter() / exception_exit(). Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
* tile: Use the more common pr_warn instead of pr_warningJoe Perches2014-11-111-5/+5
| | | | | | | | | | | | | | And other message logging neatening. Other miscellanea: o coalesce formats o realign arguments o standardize a couple of macros o use __func__ instead of embedding the function name Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tile: use ARRAY_SIZEHimangi Saraogi2014-10-021-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | ARRAY_SIZE is more concise to use when the size of an array is divided by the size of its type or the size of its first element. The semantic patch that makes this change is as follows: // <smpl> @i@ @@ @@ type T; T[] E; @@ - (sizeof(E)/sizeof(T)) + ARRAY_SIZE(E) // </smpl> Signed-off-by: Himangi Saraogi <himangi774@gmail.com> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* replace strict_strto* call with kstrto*Daniel Walter2014-05-281-3/+2
| | | | | | | | remove obsolete calls to strict_strto* and replace them with kstrto* calls accordingly. Signed-off-by: Daniel Walter <dwalter@google.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tile: use standard tile_bundle_bits type in traps.cChris Metcalf2013-09-031-9/+3
| | | | | | We were rolling our own bundle_bits, which is unnecessary. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tilegx: support KGDBChris Metcalf2013-09-031-0/+5
| | | | | | | | | | Enter kernel debugger at boot with: --hvd UART_1=1 --hvx kgdbwait --hvx kgdboc=ttyS1,115200 or at runtime with: echo ttyS1,115200 > /sys/module/kgdboc/parameters/kgdboc echo g > /proc/sysrq-trigger Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tile: parameterize VA and PA space more cleanlyChris Metcalf2013-09-031-1/+1
| | | | | | | | | | | | | | | | | | | | | | The existing code relied on the hardware definition (<arch/chip.h>) to specify how much VA and PA space was available. It's convenient to allow customizing this for some configurations, so provide symbols MAX_PA_WIDTH and MAX_VA_WIDTH in <asm/page.h> that can be modified if desired. Additionally, move away from the MEM_XX_INTRPT nomenclature to define the start of various regions within the VA space. In fact the cleaner symbol is, for example, MEM_SV_START, to indicate the start of the area used for supervisor code; the actual address of the interrupt vectors is not as important, and can be changed if desired. As part of this change, convert from "intrpt1" nomenclature (which built in the old privilege-level 1 model) to a simple "intrpt". Also strip out some tilepro-specific code supporting modifying the PL the kernel could run at, since we don't actually support using different PLs in tilepro, only tilegx. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tile: support kprobes on tilegxTony Lu2013-08-301-1/+44
| | | | | | | | This change includes support for Kprobes, Jprobes and Return Probes. Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Tony Lu <zlu@tilera.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* tile: improve illegal translation interrupt handlingChris Metcalf2013-08-131-10/+15
| | | | | | | | | | | | | | First, don't re-enable interrupts blindly in the Linux trap handler. We already handle page faults this way; synchronous interrupts like ILL_TRANS will fire even when interrupts are disabled, and we don't want to re-enable interrupts in that case. For ILL_TRANS, we now pass the ILL_VA_PC reason into the trap handler so we can report it properly; this is the address that caused the illegal translation trap. We print the address as part of the pr_alert() message now if it's coming from the kernel. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: add descriptive text if the kernel reports a bad trapChris Metcalf2012-05-251-2/+28
| | | | | | | | If the kernel unexpectedly takes a bad trap, it's convenient to have it report the type of trap as part of the error. This gives customers a bit more context before they call up customer support. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: fix up some minor trap handling issuesChris Metcalf2012-04-021-2/+7
| | | | | | | | | | We now respond to MEM_ERROR traps (e.g. an atomic instruction to non-cacheable memory) with a SIGBUS. We also no longer generate a console crash message if a user process die due to a SIGTRAP. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: work around a hardware issue with the return-address stackChris Metcalf2012-04-021-1/+5
| | | | | | | In certain circumstances we need to do a bunch of jump-and-link instructions to fill the hardware return-address stack with nonzero values. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* Disintegrate asm/system.h for TileDavid Howells2012-03-281-0/+1
| | | | | | | Disintegrate asm/system.h for Tile. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: factor out <arch/opcode.h> headerChris Metcalf2011-11-031-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | The kernel code was using some <asm> headers that included a mix of hardware-specific information (typically found in Tilera <arch> headers) and structures, enums, and function declarations supporting the disassembly function of the tile-desc.c sources. This change refactors that code so that a hardware-specific, but OS- and application-agnostic header, is created: <arch/opcode.h>. This header is then exported to userspace along with the other <arch> headers and can be used to build userspace code; in particular, it is used by glibc as part of implementing the backtrace() function. The new header, together with a header that specifically describes the disassembly code (<asm/tile-desc.h> with _32 and _64 variants), replaces the old <asm/opcode-tile*.h> and <asm/opcode_constants*.h> headers. As part of this change, we are also renaming the 32-bit constants from TILE_xxx to TILEPRO_xxx to better reflect the fact that they are specific to the TILEPro architecture, and not to TILE-Gx and any successor "tile" architecture chips. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: support signal "exception-trace" hookChris Metcalf2011-05-191-0/+1
| | | | | | | | | | | | | | | | This change adds support for /proc/sys/debug/exception-trace to tile. Like x86 and sparc, by default it is set to "1", generating a one-line printk whenever a user process crashes. By setting it to "2", we get a much more complete userspace diagnostic at crash time, including a user-space backtrace, register dump, and memory dump around the address of the crash. Some vestiges of the Tilera-internal version of this support are removed with this patch (the show_crashinfo variable and the arch_coredump_signal function). We retain a "crashinfo" boot parameter which allows you to set the boot-time value of exception-trace. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: enable single-step support for TILE-GxChris Metcalf2010-10-151-1/+1
| | | | | | | | | This is not quite the complete support, since we're not yet shipping intvec_64.S, but it is the support relevant to the set of files we are currently shipping, and makes it easier to track changes between our internal sources and our public GIT repository. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: parameterize system PLs to support KVM portChris Metcalf2010-10-151-1/+1
| | | | | | | | | While not a port to KVM (yet), this change modifies the kernel to be able to build either at PL1 or at PL2 with a suitable config switch. Pushing up this change avoids handling branch merge issues going forward with the KVM work. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: support backtracing on TILE-GxChris Metcalf2010-08-131-1/+3
| | | | | | | | | This functionality was stubbed out until recently. Now we support our normal backtracing API on TILE-Gx as well as on TILE64/TILEPro. This change includes a tweak to the instruction encoding caused by adding addxli for compat mode. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
* arch/tile: Miscellaneous cleanup changes.Chris Metcalf2010-07-061-25/+105
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
* arch/tile: core support for Tilera 32-bit chips.Chris Metcalf2010-06-041-0/+237
This change is the core kernel support for TILEPro and TILE64 chips. No driver support (except the console driver) is included yet. This includes the relevant Linux headers in asm/; the low-level low-level "Tile architecture" headers in arch/, which are shared with the hypervisor, etc., and are build-system agnostic; and the relevant hypervisor headers in hv/. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Reviewed-by: Paul Mundt <lethal@linux-sh.org>
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