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path: root/drivers/misc/sgi-gru/grufault.c
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Diffstat (limited to 'drivers/misc/sgi-gru/grufault.c')
-rw-r--r--drivers/misc/sgi-gru/grufault.c118
1 files changed, 97 insertions, 21 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index ab118558552..679e0177828 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -166,7 +166,8 @@ static inline struct gru_state *irq_to_gru(int irq)
* the GRU, atomic operations must be used to clear bits.
*/
static void get_clear_fault_map(struct gru_state *gru,
- struct gru_tlb_fault_map *map)
+ struct gru_tlb_fault_map *imap,
+ struct gru_tlb_fault_map *dmap)
{
unsigned long i, k;
struct gru_tlb_fault_map *tfm;
@@ -177,7 +178,11 @@ static void get_clear_fault_map(struct gru_state *gru,
k = tfm->fault_bits[i];
if (k)
k = xchg(&tfm->fault_bits[i], 0UL);
- map->fault_bits[i] = k;
+ imap->fault_bits[i] = k;
+ k = tfm->done_bits[i];
+ if (k)
+ k = xchg(&tfm->done_bits[i], 0UL);
+ dmap->fault_bits[i] = k;
}
/*
@@ -334,6 +339,12 @@ static int gru_try_dropin(struct gru_thread_state *gts,
* Might be a hardware race OR a stupid user. Ignore FMM because FMM
* is a transient state.
*/
+ if (tfh->status != TFHSTATUS_EXCEPTION) {
+ gru_flush_cache(tfh);
+ if (tfh->status != TFHSTATUS_EXCEPTION)
+ goto failnoexception;
+ STAT(tfh_stale_on_fault);
+ }
if (tfh->state == TFHSTATE_IDLE)
goto failidle;
if (tfh->state == TFHSTATE_MISS_FMM && cb)
@@ -401,8 +412,17 @@ failfmm:
gru_dbg(grudev, "FAILED fmm tfh: 0x%p, state %d\n", tfh, tfh->state);
return 0;
+failnoexception:
+ /* TFH status did not show exception pending */
+ gru_flush_cache(tfh);
+ if (cb)
+ gru_flush_cache(cb);
+ STAT(tlb_dropin_fail_no_exception);
+ gru_dbg(grudev, "FAILED non-exception tfh: 0x%p, status %d, state %d\n", tfh, tfh->status, tfh->state);
+ return 0;
+
failidle:
- /* TFH was idle - no miss pending */
+ /* TFH state was idle - no miss pending */
gru_flush_cache(tfh);
if (cb)
gru_flush_cache(cb);
@@ -438,7 +458,7 @@ failactive:
irqreturn_t gru_intr(int irq, void *dev_id)
{
struct gru_state *gru;
- struct gru_tlb_fault_map map;
+ struct gru_tlb_fault_map imap, dmap;
struct gru_thread_state *gts;
struct gru_tlb_fault_handle *tfh = NULL;
int cbrnum, ctxnum;
@@ -451,11 +471,15 @@ irqreturn_t gru_intr(int irq, void *dev_id)
raw_smp_processor_id(), irq);
return IRQ_NONE;
}
- get_clear_fault_map(gru, &map);
- gru_dbg(grudev, "irq %d, gru %x, map 0x%lx\n", irq, gru->gs_gid,
- map.fault_bits[0]);
+ get_clear_fault_map(gru, &imap, &dmap);
+
+ for_each_cbr_in_tfm(cbrnum, dmap.fault_bits) {
+ complete(gru->gs_blade->bs_async_wq);
+ gru_dbg(grudev, "gid %d, cbr_done %d, done %d\n",
+ gru->gs_gid, cbrnum, gru->gs_blade->bs_async_wq->done);
+ }
- for_each_cbr_in_tfm(cbrnum, map.fault_bits) {
+ for_each_cbr_in_tfm(cbrnum, imap.fault_bits) {
tfh = get_tfh_by_index(gru, cbrnum);
prefetchw(tfh); /* Helps on hdw, required for emulator */
@@ -472,7 +496,9 @@ irqreturn_t gru_intr(int irq, void *dev_id)
* This is running in interrupt context. Trylock the mmap_sem.
* If it fails, retry the fault in user context.
*/
- if (down_read_trylock(&gts->ts_mm->mmap_sem)) {
+ if (!gts->ts_force_cch_reload &&
+ down_read_trylock(&gts->ts_mm->mmap_sem)) {
+ gts->ustats.fmm_tlbdropin++;
gru_try_dropin(gts, tfh, NULL);
up_read(&gts->ts_mm->mmap_sem);
} else {
@@ -491,6 +517,7 @@ static int gru_user_dropin(struct gru_thread_state *gts,
struct gru_mm_struct *gms = gts->ts_gms;
int ret;
+ gts->ustats.upm_tlbdropin++;
while (1) {
wait_event(gms->ms_wait_queue,
atomic_read(&gms->ms_range_active) == 0);
@@ -546,8 +573,8 @@ int gru_handle_user_call_os(unsigned long cb)
* CCH may contain stale data if ts_force_cch_reload is set.
*/
if (gts->ts_gru && gts->ts_force_cch_reload) {
- gru_update_cch(gts, 0);
gts->ts_force_cch_reload = 0;
+ gru_update_cch(gts, 0);
}
ret = -EAGAIN;
@@ -589,20 +616,26 @@ int gru_get_exception_detail(unsigned long arg)
} else if (gts->ts_gru) {
cbrnum = thread_cbr_number(gts, ucbnum);
cbe = get_cbe_by_index(gts->ts_gru, cbrnum);
- prefetchw(cbe);/* Harmless on hardware, required for emulator */
+ gru_flush_cache(cbe); /* CBE not coherent */
excdet.opc = cbe->opccpy;
excdet.exopc = cbe->exopccpy;
excdet.ecause = cbe->ecause;
excdet.exceptdet0 = cbe->idef1upd;
excdet.exceptdet1 = cbe->idef3upd;
+ excdet.cbrstate = cbe->cbrstate;
+ excdet.cbrexecstatus = cbe->cbrexecstatus;
+ gru_flush_cache(cbe);
ret = 0;
} else {
ret = -EAGAIN;
}
gru_unlock_gts(gts);
- gru_dbg(grudev, "address 0x%lx, ecause 0x%x\n", excdet.cb,
- excdet.ecause);
+ gru_dbg(grudev,
+ "cb 0x%lx, op %d, exopc %d, cbrstate %d, cbrexecstatus 0x%x, ecause 0x%x, "
+ "exdet0 0x%lx, exdet1 0x%x\n",
+ excdet.cb, excdet.opc, excdet.exopc, excdet.cbrstate, excdet.cbrexecstatus,
+ excdet.ecause, excdet.exceptdet0, excdet.exceptdet1);
if (!ret && copy_to_user((void __user *)arg, &excdet, sizeof(excdet)))
ret = -EFAULT;
return ret;
@@ -627,7 +660,7 @@ static int gru_unload_all_contexts(void)
if (gts && mutex_trylock(&gts->ts_ctxlock)) {
spin_unlock(&gru->gs_lock);
gru_unload_context(gts, 1);
- gru_unlock_gts(gts);
+ mutex_unlock(&gts->ts_ctxlock);
spin_lock(&gru->gs_lock);
}
}
@@ -669,6 +702,7 @@ int gru_user_flush_tlb(unsigned long arg)
{
struct gru_thread_state *gts;
struct gru_flush_tlb_req req;
+ struct gru_mm_struct *gms;
STAT(user_flush_tlb);
if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
@@ -681,8 +715,34 @@ int gru_user_flush_tlb(unsigned long arg)
if (!gts)
return -EINVAL;
- gru_flush_tlb_range(gts->ts_gms, req.vaddr, req.len);
+ gms = gts->ts_gms;
gru_unlock_gts(gts);
+ gru_flush_tlb_range(gms, req.vaddr, req.len);
+
+ return 0;
+}
+
+/*
+ * Fetch GSEG statisticss
+ */
+long gru_get_gseg_statistics(unsigned long arg)
+{
+ struct gru_thread_state *gts;
+ struct gru_get_gseg_statistics_req req;
+
+ if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
+ return -EFAULT;
+
+ gts = gru_find_lock_gts(req.gseg);
+ if (gts) {
+ memcpy(&req.stats, &gts->ustats, sizeof(gts->ustats));
+ gru_unlock_gts(gts);
+ } else {
+ memset(&req.stats, 0, sizeof(gts->ustats));
+ }
+
+ if (copy_to_user((void __user *)arg, &req, sizeof(req)))
+ return -EFAULT;
return 0;
}
@@ -691,18 +751,34 @@ int gru_user_flush_tlb(unsigned long arg)
* Register the current task as the user of the GSEG slice.
* Needed for TLB fault interrupt targeting.
*/
-int gru_set_task_slice(long address)
+int gru_set_context_option(unsigned long arg)
{
struct gru_thread_state *gts;
+ struct gru_set_context_option_req req;
+ int ret = 0;
+
+ STAT(set_context_option);
+ if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
+ return -EFAULT;
+ gru_dbg(grudev, "op %d, gseg 0x%lx, value1 0x%lx\n", req.op, req.gseg, req.val1);
- STAT(set_task_slice);
- gru_dbg(grudev, "address 0x%lx\n", address);
- gts = gru_alloc_locked_gts(address);
+ gts = gru_alloc_locked_gts(req.gseg);
if (!gts)
return -EINVAL;
- gts->ts_tgid_owner = current->tgid;
+ switch (req.op) {
+ case sco_gseg_owner:
+ /* Register the current task as the GSEG owner */
+ gts->ts_tgid_owner = current->tgid;
+ break;
+ case sco_cch_req_slice:
+ /* Set the CCH slice option */
+ gts->ts_cch_req_slice = req.val1 & 3;
+ break;
+ default:
+ ret = -EINVAL;
+ }
gru_unlock_gts(gts);
- return 0;
+ return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-03 11:08:32 +0000