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| author | Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> | 2017-11-07 18:23:46 -0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-12 09:03:07 +1100 |
| commit | dfe954e4456277effffb2c5add47fa25390f8cea (patch) | |
| tree | 46f5b6d495f29edc494c20b45f0a40421cc2931e | |
| parent | 36a288fe9dab9a6b0b50ffdb5c34f04c42cee2ac (diff) | |
| download | linux-dfe954e4456277effffb2c5add47fa25390f8cea.tar.gz linux-dfe954e4456277effffb2c5add47fa25390f8cea.tar.bz2 linux-dfe954e4456277effffb2c5add47fa25390f8cea.zip | |
powerpc/vas: Reduce polling interval for busy state
A VAS window is normally in "busy" state for only a short duration.
Reduce the time we wait for the window to go to "not-busy" state to
speed-up vas_win_close() a bit.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas-window.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 95622a984b05..1422cdd7d917 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -1060,21 +1060,23 @@ int vas_paste_crb(struct vas_window *txwin, int offset, bool re) } EXPORT_SYMBOL_GPL(vas_paste_crb); +/* + * Wait for the window to go to "not-busy" state. It should only take a + * short time to queue a CRB, so window should not be busy for too long. + * Trying 5ms intervals. + */ static void poll_window_busy_state(struct vas_window *window) { int busy; u64 val; retry: - /* - * Poll Window Busy flag - */ val = read_hvwc_reg(window, VREG(WIN_STATUS)); busy = GET_FIELD(VAS_WIN_BUSY, val); if (busy) { val = 0; set_current_state(TASK_UNINTERRUPTIBLE); - schedule_timeout(HZ); + schedule_timeout(msecs_to_jiffies(5)); goto retry; } } |