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gru: check for correct GRU chiplet assignment 

Simplify the code that checks for correct assignment of GRU contexts to
users.

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 2009-12-15 16:48:15 -08:00 committed by Linus Torvalds
parent 54465dcc03
commit 4131479088
1 changed files with 30 additions and 14 deletions
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44
drivers/misc/sgi-gru/grumain.c
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@ -53,12 +53,16 @@ struct device *grudev = &gru_device;
*/
int gru_cpu_fault_map_id(void)
{
#ifdef CONFIG_IA64
return uv_blade_processor_id() % GRU_NUM_TFM;
#else
int cpu = smp_processor_id();
int id, core;
core = uv_cpu_core_number(cpu);
id = core + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
return id;
#endif
}
/*--------- ASID Management -------------------------------------------
@ -698,16 +702,35 @@ static int gru_retarget_intr(struct gru_thread_state *gts)
return gru_update_cch(gts);
}
/*
* Check if a GRU context is allowed to use a specific chiplet. By default
* a context is assigned to any blade-local chiplet. However, users can
* override this.
* Returns 1 if assignment allowed, 0 otherwise
*/
static int gru_check_chiplet_assignment(struct gru_state *gru,
struct gru_thread_state *gts)
{
int blade_id;
int chiplet_id;
blade_id = gts->ts_user_blade_id;
if (blade_id < 0)
blade_id = uv_numa_blade_id();
chiplet_id = gts->ts_user_chiplet_id;
return gru->gs_blade_id == blade_id &&
(chiplet_id < 0 || chiplet_id == gru->gs_chiplet_id);
}
/*
* Unload the gru context if it is not assigned to the correct blade or
* chiplet. Misassignment can occur if the process migrates to a different
* blade or if the user changes the selected blade/chiplet.
* Return 0 if context correct placed, otherwise 1
*/
void gru_check_context_placement(struct gru_thread_state *gts)
{
struct gru_state *gru;
int blade_id, chiplet_id;
/*
* If the current task is the context owner, verify that the
@ -718,13 +741,7 @@ void gru_check_context_placement(struct gru_thread_state *gts)
if (!gru || gts->ts_tgid_owner != current->tgid)
return;
blade_id = gts->ts_user_blade_id;
if (blade_id < 0)
blade_id = uv_numa_blade_id();
chiplet_id = gts->ts_user_chiplet_id;
if (gru->gs_blade_id != blade_id ||
(chiplet_id >= 0 && chiplet_id != gru->gs_chiplet_id)) {
if (!gru_check_chiplet_assignment(gru, gts)) {
STAT(check_context_unload);
gru_unload_context(gts, 1);
} else if (gru_retarget_intr(gts)) {
@ -768,9 +785,9 @@ void gru_steal_context(struct gru_thread_state *gts)
struct gru_state *gru, *gru0;
struct gru_thread_state *ngts = NULL;
int ctxnum, ctxnum0, flag = 0, cbr, dsr;
int blade_id = gts->ts_user_blade_id;
int chiplet_id = gts->ts_user_chiplet_id;
int blade_id;
blade_id = gts->ts_user_blade_id;
if (blade_id < 0)
blade_id = uv_numa_blade_id();
cbr = gts->ts_cbr_au_count;
@ -788,7 +805,7 @@ void gru_steal_context(struct gru_thread_state *gts)
ctxnum0 = ctxnum;
gru0 = gru;
while (1) {
if (chiplet_id < 0 || chiplet_id == gru->gs_chiplet_id) {
if (gru_check_chiplet_assignment(gru, gts)) {
if (check_gru_resources(gru, cbr, dsr, GRU_NUM_CCH))
break;
spin_lock(&gru->gs_lock);
@ -853,7 +870,6 @@ struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts)
struct gru_state *gru, *grux;
int i, max_active_contexts;
int blade_id = gts->ts_user_blade_id;
int chiplet_id = gts->ts_user_chiplet_id;
if (blade_id < 0)
blade_id = uv_numa_blade_id();
@ -861,7 +877,7 @@ struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts)
gru = NULL;
max_active_contexts = GRU_NUM_CCH;
for_each_gru_on_blade(grux, blade_id, i) {
if (chiplet_id >= 0 && chiplet_id != grux->gs_chiplet_id)
if (!gru_check_chiplet_assignment(grux, gts))
continue;
if (check_gru_resources(grux, gts->ts_cbr_au_count,
gts->ts_dsr_au_count,