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  1. 15 Jun, 2006 10 commits
  3. 13 Jun, 2006 1 commit
  5. 12 Jun, 2006 3 commits
    • Paul Mackerras's avatar
      powerpc: Remove unused paca->pgdir field · 43064431
      Paul Mackerras authored 
      The pgdir field in the paca was a leftover from the dynamic VSIDs
patch, and is not used in the current kernel code.  This removes it.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      43064431
    • Paul Mackerras's avatar
      Merge branch 'merge' · 7a0c58d0
      Paul Mackerras authored
      7a0c58d0
    • Paul Mackerras's avatar
      [PATCH] Fix for the PPTP hangs that have been reported · 289a1e99
      Paul Mackerras authored 
      People have been reporting that PPP connections over ptys, such as
used with PPTP, will hang randomly when transferring large amounts of
data, for instance in http://bugzilla.kernel.org/show_bug.cgi?id=6530.
I have managed to reproduce the problem, and the patch below fixes the
actual cause.

The problem is not in fact in ppp_async.c but in n_tty.c.  What
happens is that when pptp reads from the pty, we call read_chan() in
drivers/char/n_tty.c on the master side of the pty.  That copies all
the characters out of its buffer to userspace and then calls
check_unthrottle(), which calls the pty unthrottle routine, which
calls tty_wakeup on the slave side, which calls ppp_asynctty_wakeup,
which calls tasklet_schedule.  So far so good.  Since we are in
process context, the tasklet runs immediately and calls
ppp_async_process(), which calls ppp_async_push, which calls the
tty->driver->write function to send some more output.

However, tty->driver->write() returns zero, because the master
tty->receive_room is still zero.  We haven't returned from
check_unthrottle() yet, and read_chan() only updates tty->receive_room
_after_ calling check_unthrottle.  That means that the driver->write
call in ppp_async_process() returns 0.  That would be fine if we were
going to get a subsequent wakeup call, but we aren't (we just had it,
and the buffer is now empty).

The solution is for n_tty.c to update tty->receive_room _before_
calling the driver unthrottle routine.  The patch below does this.
With this patch I was able to transfer a 900MB file over a PPTP
connection (taking about 25 minutes), whereas without the patch the
connection would always stall in under a minute.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      289a1e99
  7. 11 Jun, 2006 9 commits
  9. 10 Jun, 2006 9 commits
  11. 09 Jun, 2006 8 commits
    • David S. Miller's avatar
      [TG3]: Handle Sun onboard tg3 chips more correctly. · f49639e6
      David S. Miller authored 
      Get rid of all the SUN_570X logic and instead:

1) Make sure MEMARB_ENABLE is set when we probe the SRAM
   for config information.  If that is off we will get
   timeouts.

2) Always try to sync with the firmware, if there is no
   firmware running do not treat it as an error and instead
   just report it the first time we notice this condition.

3) If there is no valid SRAM signature, assume the device
   is onboard by setting TG3_FLAG_EEPROM_WRITE_PROT.

Update driver version and release date.

With help from Michael Chan and Fabio Massimo Di Nitto.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f49639e6
    • David S. Miller's avatar
      [SPARC64]: Dump local cpu registers in sun4v_log_error() · 5224e6cc
      David S. Miller authored 
      This makes the debugging information more usable.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5224e6cc
    • Michael Ellerman's avatar
      [PATCH] powerpc: Cleanup hvc_rtas.c a little · 6b81e800
      Michael Ellerman authored 
      A few cleanups in hvc_rtas.c:
 1. Remove unused RTASCONS_PUT_ATTEMPTS
 2. Remove unused rtascons_put_delay.
 3. Use i as a loop counter like everyone else on earth.
 4. Remove pointless variables, eg. x = foo; if (x) return something_else;
 5. Whitespace cleanups and formatting.
Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      6b81e800
    • Michael Ellerman's avatar
      [PATCH] powerpc: Make rtas console _much_ faster · b5374461
      Michael Ellerman authored 
      Currently the hvc_rtas driver is painfully slow to use. Our "benchmark" is
ls -R /etc, which spits out about 27866 characters. The theoretical maximum
speed would be about 2.2 seconds, the current code takes ~50 seconds.

The core of the problem is that sometimes when the tty layer asks us to push
characters the firmware isn't able to handle some or all of them, and so
returns an error. The current code sees this and just returns to the tty code
with the buffer half sent.

The khvcd thread will eventually wake up and try to push more characters, which
will usually work because by then the firmware's had time to make room. But
the khvcd thread only wakes up every 10 milliseconds, which isn't fast enough.

So change the khvcd thread logic so that if there's an incomplete write we
yield() and then immediately try writing again. Doing so makes POLL_QUICK and
POLL_WRITE synonymous, so remove POLL_QUICK.

With this patch our "benchmark" takes ~2.8 seconds.
Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      b5374461
    • Paul Mackerras's avatar
      [PATCH] powerpc: Implement PR_[GS]ET_UNALIGN prctls for powerpc · e9370ae1
      Paul Mackerras authored 
      This gives the ability to control whether alignment exceptions get
fixed up or reported to the process as a SIGBUS, using the existing
PR_SET_UNALIGN and PR_GET_UNALIGN prctls.  We do not implement the
option of logging a message on alignment exceptions.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      e9370ae1
    • Paul Mackerras's avatar
      [PATCH] powerpc: Implement support for setting little-endian mode via prctl · fab5db97
      Paul Mackerras authored 
      This adds the PowerPC part of the code to allow processes to change
their endian mode via prctl.

This also extends the alignment exception handler to be able to fix up
alignment exceptions that occur in little-endian mode, both for
"PowerPC" little-endian and true little-endian.

We always enter signal handlers in big-endian mode -- the support for
little-endian mode does not amount to the creation of a little-endian
user/kernel ABI.  If the signal handler returns, the endian mode is
restored to what it was when the signal was delivered.

We have two new kernel CPU feature bits, one for PPC little-endian and
one for true little-endian.  Most of the classic 32-bit processors
support PPC little-endian, and this is reflected in the CPU feature
table.  There are two corresponding feature bits reported to userland
in the AT_HWCAP aux vector entry.

This is based on an earlier patch by Anton Blanchard.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      fab5db97
    • Anton Blanchard's avatar
      [PATCH] Add a prctl to change the endianness of a process. · 651d765d
      Anton Blanchard authored 
      This new prctl is intended for changing the execution mode of the
processor, on processors that support both a little-endian mode and a
big-endian mode.  It is intended for use by programs such as
instruction set emulators (for example an x86 emulator on PowerPC),
which may find it convenient to use the processor in an alternate
endianness mode when executing translated instructions.

Note that this does not imply the existence of a fully-fledged ABI for
both endiannesses, or of compatibility code for converting system
calls done in the non-native endianness mode.  The program is expected
to arrange for all of its system call arguments to be presented in the
native endianness.

Switching between big and little-endian mode will require some care in
constructing the instruction sequence for the switch.  Generally the
instructions up to the instruction that invokes the prctl system call
will have to be in the old endianness, and subsequent instructions
will have to be in the new endianness.
Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      651d765d
    • Benjamin Herrenschmidt's avatar
      [PATCH] powerpc: Add udbg-immortal kernel option · 3b5e905e
      Benjamin Herrenschmidt authored 
      When debugging early kernel crashes that happen after console_init() and
before a proper console driver takes over, we often have to go hack into
udbg.c to prevent it from unregistering so we can "see" what is
happening. This patch adds a kernel command line option "udbg-immortal"
instead to avoid having to modify the kernel.
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      3b5e905e
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