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Subject[Patch 06/29] GRU - allow users to specify gru chiplet 2
From: Jack Steiner <steiner@sgi.com>

Add support to the GRU driver to allow users to specify the
blade & chiplet for allocation of GRU contexts. Add new
statistics for context loading/unloading/retargeting. Also deleted a
few GRU stats that were no longer being unused.

Signed-off-by: Jack Steiner <steiner@sgi.com>


---
drivers/misc/sgi-gru/grufault.c | 13 ---
drivers/misc/sgi-gru/grufile.c | 15 ++--
drivers/misc/sgi-gru/grukservices.c | 8 +-
drivers/misc/sgi-gru/grumain.c | 128 ++++++++++++++++++++++++------------
drivers/misc/sgi-gru/gruprocfs.c | 9 --
drivers/misc/sgi-gru/grutables.h | 16 +---
6 files changed, 109 insertions(+), 80 deletions(-)
Index: linux/drivers/misc/sgi-gru/grufault.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufault.c 2009-11-20 09:32:28.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grufault.c 2009-11-20 09:32:29.000000000 -0600
@@ -546,17 +546,7 @@ int gru_handle_user_call_os(unsigned lon
if (ucbnum >= gts->ts_cbr_au_count * GRU_CBR_AU_SIZE)
goto exit;

- /*
- * If force_unload is set, the UPM TLB fault is phony. The task
- * has migrated to another node and the GSEG must be moved. Just
- * unload the context. The task will page fault and assign a new
- * context.
- */
- if (gts->ts_tgid_owner == current->tgid && gts->ts_blade >= 0 &&
- gts->ts_blade != uv_numa_blade_id()) {
- STAT(call_os_offnode_reference);
- gts->ts_force_unload = 1;
- }
+ gru_check_context_placement(gts);

/*
* CCH may contain stale data if ts_force_cch_reload is set.
@@ -771,6 +761,7 @@ int gru_set_context_option(unsigned long
} else {
gts->ts_user_blade_id = req.val1;
gts->ts_user_chiplet_id = req.val0;
+ gru_check_context_placement(gts);
}
break;
case sco_gseg_owner:
Index: linux/drivers/misc/sgi-gru/grufile.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufile.c 2009-11-20 09:32:28.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grufile.c 2009-11-20 09:32:29.000000000 -0600
@@ -232,23 +232,24 @@ static long gru_file_unlocked_ioctl(stru
* system.
*/
static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
- void *vaddr, int nid, int bid, int grunum)
+ void *vaddr, int blade_id, int chiplet_id)
{
spin_lock_init(&gru->gs_lock);
spin_lock_init(&gru->gs_asid_lock);
gru->gs_gru_base_paddr = paddr;
gru->gs_gru_base_vaddr = vaddr;
- gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
- gru->gs_blade = gru_base[bid];
- gru->gs_blade_id = bid;
+ gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
+ gru->gs_blade = gru_base[blade_id];
+ gru->gs_blade_id = blade_id;
+ gru->gs_chiplet_id = chiplet_id;
gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
gru->gs_asid_limit = MAX_ASID;
gru_tgh_flush_init(gru);
if (gru->gs_gid >= gru_max_gids)
gru_max_gids = gru->gs_gid + 1;
- gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
- bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
+ gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n",
+ blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
gru->gs_gru_base_paddr);
}

@@ -283,7 +284,7 @@ static int gru_init_tables(unsigned long
chip++, gru++) {
paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
- gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
+ gru_init_chiplet(gru, paddr, vaddr, bid, chip);
n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
cbrs = max(cbrs, n);
n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
Index: linux/drivers/misc/sgi-gru/grukservices.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grukservices.c 2009-11-20 09:32:27.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grukservices.c 2009-11-20 09:32:29.000000000 -0600
@@ -160,8 +160,10 @@ static void gru_load_kernel_context(stru
up_read(&bs->bs_kgts_sema);
down_write(&bs->bs_kgts_sema);

- if (!bs->bs_kgts)
+ if (!bs->bs_kgts) {
bs->bs_kgts = gru_alloc_gts(NULL, 0, 0, 0, 0);
+ bs->bs_kgts->ts_user_blade_id = blade_id;
+ }
kgts = bs->bs_kgts;

if (!kgts->ts_gru) {
@@ -172,9 +174,9 @@ static void gru_load_kernel_context(stru
kgts->ts_dsr_au_count = GRU_DS_BYTES_TO_AU(
GRU_NUM_KERNEL_DSR_BYTES * ncpus +
bs->bs_async_dsr_bytes);
- while (!gru_assign_gru_context(kgts, blade_id)) {
+ while (!gru_assign_gru_context(kgts)) {
msleep(1);
- gru_steal_context(kgts, blade_id);
+ gru_steal_context(kgts);
}
gru_load_context(kgts);
gru = bs->bs_kgts->ts_gru;
Index: linux/drivers/misc/sgi-gru/grumain.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grumain.c 2009-11-20 09:32:28.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grumain.c 2009-11-20 09:32:29.000000000 -0600
@@ -684,6 +684,40 @@ static int gru_retarget_intr(struct gru_
return gru_update_cch(gts, 0);
}

+/*
+ * 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
+ * context is correctly placed. This test is skipped for non-owner
+ * references. Pthread apps use non-owner references to the CBRs.
+ */
+ gru = gts->ts_gru;
+ 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)) {
+ STAT(check_context_unload);
+ gru_unload_context(gts, 1);
+ } else if (gru_retarget_intr(gts)) {
+ STAT(check_context_retarget_intr);
+ }
+}
+

/*
* Insufficient GRU resources available on the local blade. Steal a context from
@@ -714,13 +748,17 @@ static void gts_stolen(struct gru_thread
}
}

-void gru_steal_context(struct gru_thread_state *gts, int blade_id)
+void gru_steal_context(struct gru_thread_state *gts)
{
struct gru_blade_state *blade;
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;

+ if (blade_id < 0)
+ blade_id = uv_numa_blade_id();
cbr = gts->ts_cbr_au_count;
dsr = gts->ts_dsr_au_count;

@@ -731,35 +769,39 @@ void gru_steal_context(struct gru_thread
gru = blade->bs_lru_gru;
if (ctxnum == 0)
gru = next_gru(blade, gru);
+ blade->bs_lru_gru = gru;
+ blade->bs_lru_ctxnum = ctxnum;
ctxnum0 = ctxnum;
gru0 = gru;
while (1) {
- if (check_gru_resources(gru, cbr, dsr, GRU_NUM_CCH))
- break;
- spin_lock(&gru->gs_lock);
- for (; ctxnum < GRU_NUM_CCH; ctxnum++) {
- if (flag && gru == gru0 && ctxnum == ctxnum0)
+ if (chiplet_id < 0 || chiplet_id == gru->gs_chiplet_id) {
+ if (check_gru_resources(gru, cbr, dsr, GRU_NUM_CCH))
break;
- ngts = gru->gs_gts[ctxnum];
- /*
- * We are grabbing locks out of order, so trylock is
- * needed. GTSs are usually not locked, so the odds of
- * success are high. If trylock fails, try to steal a
- * different GSEG.
- */
- if (ngts && is_gts_stealable(ngts, blade))
+ spin_lock(&gru->gs_lock);
+ for (; ctxnum < GRU_NUM_CCH; ctxnum++) {
+ if (flag && gru == gru0 && ctxnum == ctxnum0)
+ break;
+ ngts = gru->gs_gts[ctxnum];
+ /*
+ * We are grabbing locks out of order, so trylock is
+ * needed. GTSs are usually not locked, so the odds of
+ * success are high. If trylock fails, try to steal a
+ * different GSEG.
+ */
+ if (ngts && is_gts_stealable(ngts, blade))
+ break;
+ ngts = NULL;
+ }
+ spin_unlock(&gru->gs_lock);
+ if (ngts || (flag && gru == gru0 && ctxnum == ctxnum0))
break;
- ngts = NULL;
- flag = 1;
}
- spin_unlock(&gru->gs_lock);
- if (ngts || (flag && gru == gru0 && ctxnum == ctxnum0))
+ if (flag && gru == gru0)
break;
+ flag = 1;
ctxnum = 0;
gru = next_gru(blade, gru);
}
- blade->bs_lru_gru = gru;
- blade->bs_lru_ctxnum = ctxnum;
spin_unlock(&blade->bs_lock);

if (ngts) {
@@ -778,19 +820,35 @@ void gru_steal_context(struct gru_thread
}

/*
+ * Assign a gru context.
+ */
+static int gru_assign_context_number(struct gru_state *gru)
+{
+ int ctxnum;
+
+ ctxnum = find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH);
+ __set_bit(ctxnum, &gru->gs_context_map);
+ return ctxnum;
+}
+
+/*
* Scan the GRUs on the local blade & assign a GRU context.
*/
-struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts,
- int blade)
+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();
again:
gru = NULL;
max_active_contexts = GRU_NUM_CCH;
- for_each_gru_on_blade(grux, blade, i) {
+ for_each_gru_on_blade(grux, blade_id, i) {
+ if (chiplet_id >= 0 && chiplet_id != grux->gs_chiplet_id)
+ continue;
if (check_gru_resources(grux, gts->ts_cbr_au_count,
gts->ts_dsr_au_count,
max_active_contexts)) {
@@ -811,12 +869,9 @@ again:
reserve_gru_resources(gru, gts);
gts->ts_gru = gru;
gts->ts_blade = gru->gs_blade_id;
- gts->ts_ctxnum =
- find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH);
- BUG_ON(gts->ts_ctxnum == GRU_NUM_CCH);
+ gts->ts_ctxnum = gru_assign_context_number(gru);
atomic_inc(&gts->ts_refcnt);
gru->gs_gts[gts->ts_ctxnum] = gts;
- __set_bit(gts->ts_ctxnum, &gru->gs_context_map);
spin_unlock(&gru->gs_lock);

STAT(assign_context);
@@ -844,7 +899,6 @@ int gru_fault(struct vm_area_struct *vma
{
struct gru_thread_state *gts;
unsigned long paddr, vaddr;
- int blade_id;

vaddr = (unsigned long)vmf->virtual_address;
gru_dbg(grudev, "vma %p, vaddr 0x%lx (0x%lx)\n",
@@ -859,28 +913,18 @@ int gru_fault(struct vm_area_struct *vma
again:
mutex_lock(&gts->ts_ctxlock);
preempt_disable();
- blade_id = uv_numa_blade_id();

- if (gts->ts_gru) {
- if (gts->ts_gru->gs_blade_id != blade_id) {
- STAT(migrated_nopfn_unload);
- gru_unload_context(gts, 1);
- } else {
- if (gru_retarget_intr(gts))
- STAT(migrated_nopfn_retarget);
- }
- }
+ gru_check_context_placement(gts);

if (!gts->ts_gru) {
STAT(load_user_context);
- if (!gru_assign_gru_context(gts, blade_id)) {
+ if (!gru_assign_gru_context(gts)) {
preempt_enable();
mutex_unlock(&gts->ts_ctxlock);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(GRU_ASSIGN_DELAY); /* true hack ZZZ */
- blade_id = uv_numa_blade_id();
if (gts->ts_steal_jiffies + GRU_STEAL_DELAY < jiffies)
- gru_steal_context(gts, blade_id);
+ gru_steal_context(gts);
goto again;
}
gru_load_context(gts);
Index: linux/drivers/misc/sgi-gru/gruprocfs.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/gruprocfs.c 2009-11-20 09:32:25.000000000 -0600
+++ linux/drivers/misc/sgi-gru/gruprocfs.c 2009-11-20 09:32:29.000000000 -0600
@@ -67,19 +67,14 @@ static int statistics_show(struct seq_fi
printstat(s, intr);
printstat(s, intr_mm_lock_failed);
printstat(s, call_os);
- printstat(s, call_os_offnode_reference);
printstat(s, call_os_check_for_bug);
printstat(s, call_os_wait_queue);
printstat(s, user_flush_tlb);
printstat(s, user_unload_context);
printstat(s, user_exception);
printstat(s, set_context_option);
- printstat(s, migrate_check);
- printstat(s, migrated_retarget);
- printstat(s, migrated_unload);
- printstat(s, migrated_unload_delay);
- printstat(s, migrated_nopfn_retarget);
- printstat(s, migrated_nopfn_unload);
+ printstat(s, check_context_retarget_intr);
+ printstat(s, check_context_unload);
printstat(s, tlb_dropin);
printstat(s, tlb_dropin_fail_no_asid);
printstat(s, tlb_dropin_fail_upm);
Index: linux/drivers/misc/sgi-gru/grutables.h
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grutables.h 2009-11-20 09:32:28.000000000 -0600
+++ linux/drivers/misc/sgi-gru/grutables.h 2009-11-20 09:32:29.000000000 -0600
@@ -192,19 +192,14 @@ struct gru_stats_s {
atomic_long_t intr;
atomic_long_t intr_mm_lock_failed;
atomic_long_t call_os;
- atomic_long_t call_os_offnode_reference;
atomic_long_t call_os_check_for_bug;
atomic_long_t call_os_wait_queue;
atomic_long_t user_flush_tlb;
atomic_long_t user_unload_context;
atomic_long_t user_exception;
atomic_long_t set_context_option;
- atomic_long_t migrate_check;
- atomic_long_t migrated_retarget;
- atomic_long_t migrated_unload;
- atomic_long_t migrated_unload_delay;
- atomic_long_t migrated_nopfn_retarget;
- atomic_long_t migrated_nopfn_unload;
+ atomic_long_t check_context_retarget_intr;
+ atomic_long_t check_context_unload;
atomic_long_t tlb_dropin;
atomic_long_t tlb_dropin_fail_no_asid;
atomic_long_t tlb_dropin_fail_upm;
@@ -425,6 +420,7 @@ struct gru_state {
gru segments (64) */
unsigned short gs_gid; /* unique GRU number */
unsigned short gs_blade_id; /* blade of GRU */
+ unsigned char gs_chiplet_id; /* blade chiplet of GRU */
unsigned char gs_tgh_local_shift; /* used to pick TGH for
local flush */
unsigned char gs_tgh_first_remote; /* starting TGH# for
@@ -636,10 +632,9 @@ extern struct gru_thread_state *gru_find
*vma, int tsid);
extern struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct
*vma, int tsid);
-extern struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts,
- int blade);
+extern struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts);
extern void gru_load_context(struct gru_thread_state *gts);
-extern void gru_steal_context(struct gru_thread_state *gts, int blade_id);
+extern void gru_steal_context(struct gru_thread_state *gts);
extern void gru_unload_context(struct gru_thread_state *gts, int savestate);
extern int gru_update_cch(struct gru_thread_state *gts, int force_unload);
extern void gts_drop(struct gru_thread_state *gts);
@@ -654,6 +649,7 @@ extern int gru_user_flush_tlb(unsigned l
extern int gru_user_unload_context(unsigned long arg);
extern int gru_get_exception_detail(unsigned long arg);
extern int gru_set_context_option(unsigned long address);
+extern void gru_check_context_placement(struct gru_thread_state *gts);
extern int gru_cpu_fault_map_id(void);
extern struct vm_area_struct *gru_find_vma(unsigned long vaddr);
extern void gru_flush_all_tlb(struct gru_state *gru);


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