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sgi-gru: add support for a user to explicitly unload a GRU context 

Add support for a user to explicitly unload a GRU context.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jack Steiner 2009-04-02 16:59:07 -07:00 committed by Linus Torvalds
parent e56484da3a
commit bb04aa78ec
1 changed files with 36 additions and 0 deletions
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36
drivers/misc/sgi-gru/grufault.c
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@ -32,6 +32,7 @@
#include <linux/device.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/security.h>
#include <asm/pgtable.h>
#include "gru.h"
#include "grutables.h"
@ -575,6 +576,38 @@ int gru_get_exception_detail(unsigned long arg)
/*
* User request to unload a context. Content is saved for possible reload.
*/
static int gru_unload_all_contexts(void)
{
struct gru_thread_state *gts;
struct gru_state *gru;
int maxgid, gid, ctxnum;
int nodesperblade;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (num_online_nodes() > 1 &&
(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
nodesperblade = 2;
else
nodesperblade = 1;
maxgid = GRU_CHIPLETS_PER_BLADE * num_online_nodes() / nodesperblade;
for (gid = 0; gid < maxgid; gid++) {
gru = GID_TO_GRU(gid);
spin_lock(&gru->gs_lock);
for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
gts = gru->gs_gts[ctxnum];
if (gts && mutex_trylock(&gts->ts_ctxlock)) {
spin_unlock(&gru->gs_lock);
gru_unload_context(gts, 1);
gru_unlock_gts(gts);
spin_lock(&gru->gs_lock);
}
}
spin_unlock(&gru->gs_lock);
}
return 0;
}
int gru_user_unload_context(unsigned long arg)
{
struct gru_thread_state *gts;
@ -586,6 +619,9 @@ int gru_user_unload_context(unsigned long arg)
gru_dbg(grudev, "gseg 0x%lx\n", req.gseg);
if (!req.gseg)
return gru_unload_all_contexts();
gts = gru_find_lock_gts(req.gseg);
if (!gts)
return -EINVAL;