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path: root/arch/sh/kernel/io_trapped.c
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2010-10-13sh: wire up perf alignment and emulation faults.Paul Mundt
This plugs in the alignment and emulation fault reporting for perf sw events. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-06-02sh: support for platforms without PIO.Paul Mundt
This extends some of the existing special casing for HAS_IOPORT platforms and gets it to the point where platforms can begin to conditionally select it. The major changes here are that the PIO routines themselves go away completely, including all of the machvec port mapping wrappers. With this in place it's possible for any non-machvec abusing platform to disable PIO completely. At present this is left as an opt-in until the abusers are the odd ones out instead of the majority. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-27sh: Optimize runtime disabling of trapped I/O.Paul Mundt
Presently trapped I/O is only registered if it's not explicitly disabled for the platforms that select it openly. From the fault path this runs through an address lookup before figuring out that nothing matches and falls back through the error path, but we can forego the lookup completely by testing if it's been explicitly disabled. This provides a measurable speedup for things like qemu that rely on runtime disabling. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-01-26sh: Mass ctrl_in/outX to __raw_read/writeX conversion.Paul Mundt
The old ctrl in/out routines are non-portable and unsuitable for cross-platform use. While drivers/sh has already been sanitized, there is still quite a lot of code that is not. This converts the arch/sh/ bits over, which permits us to flag the routines as deprecated whilst still building with -Werror for the architecture code, and to ensure that future users are not added. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-29sh: Only shout about fixing up unexpected unaligned accessesMatt Fleming
Some unaligned accesses are completely expected. For example, the trapped_io code uses the unaligned access fixup code path so there's no need to warn about having to fixup the unaligned access. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-07-29sh: Rework irqflags tracing to fix up CONFIG_PROVE_LOCKING.Stuart Menefy
This cleans up the irqflags tracing code quite a bit and ties it in to various missing callsites that caused an imbalance when CONFIG_PROVE_LOCKING was enabled. Previously this was catching on: 987 #ifdef CONFIG_PROVE_LOCKING 988 DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); 989 DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); 990 #endif 991 retval = -EAGAIN; with hardirqs being doubly enabled, and subsequently bailing out with the following call trace: Call trace: [<88035224>] __lock_acquire+0x616/0x6a6 [<88015a8c>] do_fork+0xf8/0x2b0 [<880331ec>] trace_hardirqs_on_caller+0xd4/0x114 [<88241074>] _spin_unlock_irq+0x20/0x64 [<88035224>] __lock_acquire+0x616/0x6a6 [<8800386c>] kernel_thread+0x48/0x70 [<88024ecc>] ____call_usermodehelper+0x0/0x110 [<88024ecc>] ____call_usermodehelper+0x0/0x110 [<88003894>] kernel_thread_helper+0x0/0x14 [<88024bac>] __call_usermodehelper+0x38/0x70 [<88025dc0>] worker_thread+0x150/0x274 [<88035b9c>] lock_release+0x0/0x198 [<88024b74>] __call_usermodehelper+0x0/0x70 [<88028cf0>] autoremove_wake_function+0x0/0x30 [<88028bf2>] kthread+0x3e/0x70 [<88025c70>] worker_thread+0x0/0x274 [<8800389c>] kernel_thread_helper+0x8/0x14 [<88028bb4>] kthread+0x0/0x70 [<88003894>] kernel_thread_helper+0x0/0x14 Reported-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-09sh: Rename opcode_t to insn_size_t.Paul Mundt
This is now clashing with a driver, so just rename it. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-04-02sh: Add a command line option for disabling I/O trapping.Paul Mundt
This adds a 'noiotrap' kernel command line option to permit disabling of I/O trapping. This is mostly useful for running on emulators where the physical device limitations are not an issue. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-03-06sh: Fix up section mismatches.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-02-14sh: Symbol exports for trapped I/O.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-02-14sh: Use max_t in io_trapped.Paul Mundt
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-02-14sh: trapped io support V2Magnus Damm
The idea is that we want to get rid of the in/out/readb/writeb callbacks from the machvec and replace that with simple inline read and write operations to memory. Fast and simple for most hardware devices (think pci). Some devices require special treatment though - like 16-bit only CF devices - so we need to have some method to hook in callbacks. This patch makes it possible to add a per-device trap generating filter. This way we can get maximum performance of sane hardware - which doesn't need this filter - and crappy hardware works but gets punished by a performance hit. V2 changes things around a bit and replaces io access callbacks with a simple minimum_bus_width value. In the future we can add stride as well. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>