diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2010-02-22 16:20:34 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-22 16:20:34 -0800 |
| commit | d02e30c31c57683a66ed68a1bcff900ca78f6d56 (patch) | |
| tree | c3ce99a00061bcc1199b50fa838147d876c56717 /drivers/char/uv_mmtimer.c | |
| parent | 0fdc7a8022c3eaff6b5ee27ffb9e913e5e58d8e9 (diff) | |
| parent | aef55d4922e62a0d887e60d87319f3718aec6ced (diff) | |
Merge branch 'x86/irq' into x86/apic
Merge reason:
Conflicts in arch/x86/kernel/apic/io_apic.c
Resolved Conflicts:
arch/x86/kernel/apic/io_apic.c
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'drivers/char/uv_mmtimer.c')
| -rw-r--r-- | drivers/char/uv_mmtimer.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/char/uv_mmtimer.c b/drivers/char/uv_mmtimer.c index 867b67be9f0..c7072ba14f4 100644 --- a/drivers/char/uv_mmtimer.c +++ b/drivers/char/uv_mmtimer.c @@ -89,13 +89,17 @@ static long uv_mmtimer_ioctl(struct file *file, unsigned int cmd, switch (cmd) { case MMTIMER_GETOFFSET: /* offset of the counter */ /* - * UV RTC register is on its own page + * Starting with HUB rev 2.0, the UV RTC register is + * replicated across all cachelines of it's own page. + * This allows faster simultaneous reads from a given socket. + * + * The offset returned is in 64 bit units. */ - if (PAGE_SIZE <= (1 << 16)) - ret = ((UV_LOCAL_MMR_BASE | UVH_RTC) & (PAGE_SIZE-1)) - / 8; + if (uv_get_min_hub_revision_id() == 1) + ret = 0; else - ret = -ENOSYS; + ret = ((uv_blade_processor_id() * L1_CACHE_BYTES) % + PAGE_SIZE) / 8; break; case MMTIMER_GETRES: /* resolution of the clock in 10^-15 s */ @@ -115,8 +119,8 @@ static long uv_mmtimer_ioctl(struct file *file, unsigned int cmd, ret = hweight64(UVH_RTC_REAL_TIME_CLOCK_MASK); break; - case MMTIMER_MMAPAVAIL: /* can we mmap the clock into userspace? */ - ret = (PAGE_SIZE <= (1 << 16)) ? 1 : 0; + case MMTIMER_MMAPAVAIL: + ret = 1; break; case MMTIMER_GETCOUNTER: |