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  1. 16 12月, 2009 1 次提交
  3. 14 4月, 2009 1 次提交
  5. 17 10月, 2008 1 次提交
  7. 28 4月, 2008 1 次提交
  9. 07 2月, 2008 1 次提交
  11. 20 10月, 2007 1 次提交
  13. 17 10月, 2007 5 次提交
  15. 20 9月, 2007 1 次提交
  17. 12 9月, 2007 1 次提交
  19. 09 5月, 2007 1 次提交
  21. 15 2月, 2007 1 次提交
  23. 26 10月, 2006 2 次提交
  25. 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
  27. 22 8月, 2006 1 次提交
  29. 11 7月, 2006 1 次提交
  31. 03 7月, 2006 4 次提交
    • E
      intelfb: add vsync interrupt support · f80d0d23
      由 Eric Hustvedt 提交于 
      [05/05] intelfb: Honor FB_ACTIVATE_VBL for display panning

Extends the intelfb_vsync struct to store panning offset. The interrupt service routine uses the stored panning offset if a pan is requested for the vsync. intelfbhw_disable_irq also pans the display if there is a pending request.
Signed-off-by: NEric Hustvedt <ehustvedt@cecropia.com>
      f80d0d23
    • E
      intelfb: add vsync interrupt support · 37bced38
      由 Eric Hustvedt 提交于 
      [04/05] intelfb: implement FBIO_WAITFORVSYNC ioctl

The (unofficial) FBIO_WAITFORVSYNC ioctl is implemented by sleeping on the appropriate waitqueue, as defined in my earlier patch. Currently, only display 0 (aka pipe A) is supported.
Signed-off-by: NEric Hustvedt <ehustvedt@cecropia.com>
      37bced38
    • E
      intelfb: add vsync interrupt support · 7649757b
      由 Eric Hustvedt 提交于 
      [03/05] intelfb: Implement basic interrupt handling

Functions have been added to enable and disable interrupts using the MMIO registers. Currently only pipe A vsync interrupts are enabled.
A generalized vsync accounting struct is defined, with the intent that it can encapsulate per-pipe vsync related info in the future. Currently a single instance is hard-coded.
The interrupt service routine currently only looks for vsync interrupts on pipe A, and increments a counter and wakes up anyone waiting on it.

This implementation is heavily influenced by similar implementations in the atyfb and matroxfb drivers.
Signed-off-by: NEric Hustvedt <ehustvedt@cecropia.com>
      7649757b
    • E
      intelfb: add vsync interrupt support · 9a5f019b
      由 Eric Hustvedt 提交于 
      [02/05] intelfb: Add interrupt related register definitions

Add constants for accessing HWSTAM, IER, IIR, and IMR registers.
Add constants for interrupt types supported by the 8xx and 9xx chipsets.
The registers are also stored in the hwstate struct and dumped in the debug routine.
Signed-off-by: NEric Hustvedt <ehustvedt@cecropia.com>
      9a5f019b
  33. 01 7月, 2006 1 次提交
  35. 24 6月, 2006 1 次提交
  37. 18 6月, 2006 1 次提交
  39. 27 5月, 2006 4 次提交
  41. 03 4月, 2006 9 次提交