Messages in this thread Patch in this message | | | Date | Thu, 22 Jan 2009 11:49:25 -0600 | From | steiner@sgi ... | Subject | [Patch 08/14] Add support for a user to explicitly unload a GRU context |
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From: Jack Steiner <steiner@sgi.com>
Add support for a user to explicitly unload a GRU context.
Signed-off-by: Jack Steiner <steiner@sgi.com>
--- drivers/misc/sgi-gru/grufault.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
Index: linux/drivers/misc/sgi-gru/grufault.c =================================================================== --- linux.orig/drivers/misc/sgi-gru/grufault.c 2009-01-15 08:18:06.000000000 -0600 +++ linux/drivers/misc/sgi-gru/grufault.c 2009-01-15 08:18:10.000000000 -0600 @@ -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 lo /* * 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(>s->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 lon 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;
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