RFC Support vector domain on ia64

Hi,

Here is a series of patches for ia64 vector domain. By these patches, we can use more than 256 irqs. The patchset is based on existing x86-64 vector domain code. This is for 2.6.22-rc5 and I tested them on my ia64 box.

Changes from previous patchset:

- rebase to 2.6.22-rc5

- define NR_IRQS as (NR_VECTORS + (32 * NR_CPUS))
NR_VECTROS equals 256

- bind gsi to irq
If irq number is changed for each enable/disable, suspend/resume may cause some problems. To avoid this problem, bind each gsi to specific irq.

This patchset is just a draft, so there is following TBD, I think.

o How to migrate irq

In migration, we don't handle the vector for the pending irqs. Probably we should manage it.

There are following 13 patches for ia64 vector domain.

  [PATCH take2 1/13]  Remove block structure for locking in iosapic.c
  [PATCH take2 2/13]  Remove duplicated members in iosapic_rte_info
  [PATCH take2 3/13]  Use per iosapic lock for indirect iosapic register access
  [PATCH take2 4/13]  Cleanup lock order in iosapic_register_intr
  [PATCH take2 5/13]  Use dynamic irq for iosapic interrupts
  [PATCH take2 6/13]  Fix invalid irq vector assumption for iosapic
  [PATCH take2 7/13]  Check if irq is sharable
  [PATCH take2 8/13]  Add mapping table between irq and vector
  [PATCH take2 9/13]  Add support for vector domain

[PATCH take2 10/13] Support irq migration across domain [PATCH take2 11/13] Enable percpu vector domain for IA64_GENERIC [PATCH take2 12/13] Enable percpu vector domain for IA64_DIG [PATCH take2 13/13] Bind gsi to irq

For more details, please refer to the header of each patch.

Any comments or questions are welcome.

Thanks.
Yasuaki Ishimatsu