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powerpc/vas: Drop poll_window_cast_out(). 

Polling for window cast out is listed in the spec, but turns out that
it is not strictly necessary and slows down window close. Making it a
stub for now.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu 2017-11-07 18:23:44 -08:00 committed by Michael Ellerman
parent 0a2c2c24cf
commit 4963ac3632
1 changed files with 17 additions and 17 deletions
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34
arch/powerpc/platforms/powernv/vas-window.c
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@ -1079,25 +1079,25 @@ retry:
}
}
/*
* Have the hardware cast a window out of cache and wait for it to
* be completed.
*
* NOTE: It can take a relatively long time to cast the window context
* out of the cache. It is not strictly necessary to cast out if:
*
* - we clear the "Pin Window" bit (so hardware is free to evict)
*
* - we re-initialize the window context when it is reassigned.
*
* We do the former in vas_win_close() and latter in vas_win_open().
* So, ignoring the cast-out for now. We can add it as needed. If
* casting out becomes necessary we should consider offloading the
* job to a worker thread, so the window close can proceed quickly.
*/
static void poll_window_castout(struct vas_window *window)
{
int cached;
u64 val;
/* Cast window context out of the cache */
retry:
val = read_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL));
cached = GET_FIELD(VAS_WIN_CACHE_STATUS, val);
if (cached) {
val = 0ULL;
val = SET_FIELD(VAS_CASTOUT_REQ, val, 1);
val = SET_FIELD(VAS_PUSH_TO_MEM, val, 0);
write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ);
goto retry;
}
/* stub for now */
}
/*