Skip to content

cloud-kernel
cloud-kernel

openanolis / cloud-kernel
大约 1 年 前同步成功

通知 158
Star 36
Fork 7
cloud-kernel
cloud-kernel
切换分支/标签
  1. 11 10月, 2006 1 次提交
  3. 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
  5. 28 9月, 2006 1 次提交
  7. 24 8月, 2006 1 次提交
    • J
      libata: Grand renaming. · cca3974e
      由 Jeff Garzik 提交于 
      The biggest change is that ata_host_set is renamed to ata_host.

* ata_host_set			=> ata_host
* ata_probe_ent->host_flags	=> ata_probe_ent->port_flags
* ata_probe_ent->host_set_flags	=> ata_probe_ent->_host_flags
* ata_host_stats		=> ata_port_stats
* ata_port->host		=> ata_port->scsi_host
* ata_port->host_set		=> ata_port->host
* ata_port_info->host_flags	=> ata_port_info->flags
* ata_(.*)host_set(.*)\(\)	=> ata_\1host\2()

The leading underscore in ata_probe_ent->_host_flags is to avoid
reusing ->host_flags for different purpose.  Currently, the only user
of the field is libata-bmdma.c and probe_ent itself is scheduled to be
removed.

ata_port->host is reused for different purpose but this field is used
inside libata core proper and of different type.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      cca3974e
  9. 10 8月, 2006 2 次提交
  11. 24 7月, 2006 1 次提交
  13. 03 7月, 2006 1 次提交
  15. 31 5月, 2006 1 次提交
  17. 24 5月, 2006 2 次提交
  19. 15 5月, 2006 1 次提交
  21. 11 4月, 2006 1 次提交
  23. 03 4月, 2006 1 次提交
  25. 02 4月, 2006 1 次提交
  27. 22 3月, 2006 1 次提交
  29. 05 3月, 2006 1 次提交
  31. 13 2月, 2006 1 次提交
  33. 10 2月, 2006 2 次提交
  35. 29 1月, 2006 1 次提交
  37. 27 1月, 2006 2 次提交
  39. 17 1月, 2006 1 次提交
  41. 06 1月, 2006 1 次提交
  43. 14 12月, 2005 1 次提交
  45. 13 12月, 2005 1 次提交
    • J
      [libata] mark certain hardware (or drivers) with a no-atapi flag · 50630195
      由 Jeff Garzik 提交于 
      Some hardware does not support the PACKET command at all.
Other hardware supports ATAPI, but the driver does something nasty such
as calling BUG() when an ATAPI command is issued.

For these such cases, we mark them with a new flag, ATA_FLAG_NO_ATAPI.

Initial version contributed by Ben Collins.
      50630195
  47. 06 12月, 2005 1 次提交
  49. 01 12月, 2005 2 次提交
  51. 17 11月, 2005 1 次提交
  53. 11 11月, 2005 1 次提交
  55. 10 11月, 2005 1 次提交
  57. 07 11月, 2005 1 次提交
  59. 31 10月, 2005 1 次提交
  61. 30 10月, 2005 1 次提交
    • J
      [libata] change ata_qc_complete() to take error mask as second arg · a7dac447
      由 Jeff Garzik 提交于 
      The second argument to ata_qc_complete() was being used for two
purposes: communicate the ATA Status register to the completion
function, and indicate an error.  On legacy PCI IDE hardware, the latter
is often implicit in the former.  On more modern hardware, the driver
often completely emulated a Status register value, passing ATA_ERR as an
indication that something went wrong.

Now that previous code changes have eliminated the need to use drv_stat
arg to communicate the ATA Status register value, we can convert it to a
mask of possible error classes.

This will lead to more flexible error handling in the future.
      a7dac447
  63. 29 10月, 2005 2 次提交
  65. 23 10月, 2005 1 次提交
  67. 21 10月, 2005 1 次提交