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  1. 03 3月, 2007 1 次提交
  3. 27 2月, 2007 1 次提交
  5. 06 2月, 2007 1 次提交
  7. 19 1月, 2007 3 次提交
  9. 27 12月, 2006 5 次提交
  11. 11 12月, 2006 7 次提交
  13. 07 12月, 2006 1 次提交
  15. 05 12月, 2006 1 次提交
  17. 03 12月, 2006 1 次提交
  19. 22 11月, 2006 1 次提交
  21. 01 11月, 2006 1 次提交
  23. 05 10月, 2006 1 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      由 David Howells 提交于 
      Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.
Signed-Off-By: NDavid Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  25. 23 9月, 2006 1 次提交
  27. 14 9月, 2006 1 次提交
  29. 06 9月, 2006 1 次提交
    • B
      [PATCH] myri10ge: improve firmware selection · ce7f9368
      由 Brice Goglin 提交于 
      Improve the firmware selection by adding 2 cases where we should use the
optimized firmware:
* when the actual PCIe link width is lower than 8x.
* when the board is plugged to one of the new Intel PCIe chipsets that
  are known to provide aligned PCIe completions.

The patch actually raises two concerns:
* We might want to add a generic PCI function to get the PCIe link width since
  some other drivers (at least ipath) do the same. But we probably do not want
  to add a new function for every PCIe capability. I will probably look at it
  and discuss it on linux-pci in the future.
* As requested during the submission, the PCI ids of chipsets that are known to
  provided aligned completion are defined in the myri10ge code. If we keep adding
  new ones, it might become better to move them to pciids.h.
  But, this sort of quirk to detect these chipsets are very specific to our NIC,
  I don't think it is worth moving it to the PCI core until somebody else really
  needs it.
Signed-off-by: NBrice Goglin <brice@myri.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      ce7f9368
  31. 24 8月, 2006 2 次提交
  33. 20 8月, 2006 2 次提交
  35. 09 8月, 2006 1 次提交
  37. 04 8月, 2006 2 次提交
  39. 29 7月, 2006 1 次提交
  41. 13 7月, 2006 1 次提交
    • B
      [PATCH] myri10ge return value fix · 4c2248cc
      由 Brice Goglin 提交于 
      Andrew Morton wrote:
>   All these functions return error codes, and we're not checking them.  We
>   should.  So there's a patch which marks all these things as __must_check,
>   which causes around 1,500 new warnings.
>

The following patch fixes such a warning in myri10ge.

Check pci_enable_device() return value in myri10ge_resume().
Signed-off-by: NBrice Goglin <brice@myri.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      4c2248cc
  43. 09 7月, 2006 1 次提交
  45. 06 7月, 2006 3 次提交