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Commit bb04aa78 authored by Jack Steiner's avatar Jack Steiner Committed by Linus Torvalds
Browse files

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: default avatarJack Steiner <steiner@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e56484da

drivers/misc/sgi-gru/grufault.c

+36 −0
Original line number Diff line number Diff line
@@ -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;