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path: root/drivers/misc/sgi-gru/grumain.c
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Diffstat (limited to 'drivers/misc/sgi-gru/grumain.c')
-rw-r--r--drivers/misc/sgi-gru/grumain.c228
1 files changed, 152 insertions, 76 deletions
diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
index 3bc643dad606..f8538bbd0bfa 100644
--- a/drivers/misc/sgi-gru/grumain.c
+++ b/drivers/misc/sgi-gru/grumain.c
@@ -27,6 +27,7 @@
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/list.h>
+#include <linux/err.h>
#include <asm/uv/uv_hub.h>
#include "gru.h"
#include "grutables.h"
@@ -48,12 +49,20 @@ struct device *grudev = &gru_device;
/*
* Select a gru fault map to be used by the current cpu. Note that
* multiple cpus may be using the same map.
- * ZZZ should "shift" be used?? Depends on HT cpu numbering
* ZZZ should be inline but did not work on emulator
*/
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 -------------------------------------------
@@ -286,7 +295,8 @@ static void gru_unload_mm_tracker(struct gru_state *gru,
void gts_drop(struct gru_thread_state *gts)
{
if (gts && atomic_dec_return(&gts->ts_refcnt) == 0) {
- gru_drop_mmu_notifier(gts->ts_gms);
+ if (gts->ts_gms)
+ gru_drop_mmu_notifier(gts->ts_gms);
kfree(gts);
STAT(gts_free);
}
@@ -310,16 +320,18 @@ static struct gru_thread_state *gru_find_current_gts_nolock(struct gru_vma_data
* Allocate a thread state structure.
*/
struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
- int cbr_au_count, int dsr_au_count, int options, int tsid)
+ int cbr_au_count, int dsr_au_count,
+ unsigned char tlb_preload_count, int options, int tsid)
{
struct gru_thread_state *gts;
+ struct gru_mm_struct *gms;
int bytes;
bytes = DSR_BYTES(dsr_au_count) + CBR_BYTES(cbr_au_count);
bytes += sizeof(struct gru_thread_state);
gts = kmalloc(bytes, GFP_KERNEL);
if (!gts)
- return NULL;
+ return ERR_PTR(-ENOMEM);
STAT(gts_alloc);
memset(gts, 0, sizeof(struct gru_thread_state)); /* zero out header */
@@ -327,7 +339,10 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
mutex_init(&gts->ts_ctxlock);
gts->ts_cbr_au_count = cbr_au_count;
gts->ts_dsr_au_count = dsr_au_count;
+ gts->ts_tlb_preload_count = tlb_preload_count;
gts->ts_user_options = options;
+ gts->ts_user_blade_id = -1;
+ gts->ts_user_chiplet_id = -1;
gts->ts_tsid = tsid;
gts->ts_ctxnum = NULLCTX;
gts->ts_tlb_int_select = -1;
@@ -336,9 +351,10 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
if (vma) {
gts->ts_mm = current->mm;
gts->ts_vma = vma;
- gts->ts_gms = gru_register_mmu_notifier();
- if (!gts->ts_gms)
+ gms = gru_register_mmu_notifier();
+ if (IS_ERR(gms))
goto err;
+ gts->ts_gms = gms;
}
gru_dbg(grudev, "alloc gts %p\n", gts);
@@ -346,7 +362,7 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
err:
gts_drop(gts);
- return NULL;
+ return ERR_CAST(gms);
}
/*
@@ -360,6 +376,7 @@ struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma, int tsid)
if (!vdata)
return NULL;
+ STAT(vdata_alloc);
INIT_LIST_HEAD(&vdata->vd_head);
spin_lock_init(&vdata->vd_lock);
gru_dbg(grudev, "alloc vdata %p\n", vdata);
@@ -392,10 +409,12 @@ struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct *vma,
struct gru_vma_data *vdata = vma->vm_private_data;
struct gru_thread_state *gts, *ngts;
- gts = gru_alloc_gts(vma, vdata->vd_cbr_au_count, vdata->vd_dsr_au_count,
+ gts = gru_alloc_gts(vma, vdata->vd_cbr_au_count,
+ vdata->vd_dsr_au_count,
+ vdata->vd_tlb_preload_count,
vdata->vd_user_options, tsid);
- if (!gts)
- return NULL;
+ if (IS_ERR(gts))
+ return gts;
spin_lock(&vdata->vd_lock);
ngts = gru_find_current_gts_nolock(vdata, tsid);
@@ -493,6 +512,9 @@ static void gru_load_context_data(void *save, void *grubase, int ctxnum,
memset(cbe + i * GRU_HANDLE_STRIDE, 0,
GRU_CACHE_LINE_BYTES);
}
+ /* Flush CBE to hide race in context restart */
+ mb();
+ gru_flush_cache(cbe + i * GRU_HANDLE_STRIDE);
cb += GRU_HANDLE_STRIDE;
}
@@ -513,6 +535,12 @@ static void gru_unload_context_data(void *save, void *grubase, int ctxnum,
cb = gseg + GRU_CB_BASE;
cbe = grubase + GRU_CBE_BASE;
length = hweight64(dsrmap) * GRU_DSR_AU_BYTES;
+
+ /* CBEs may not be coherent. Flush them from cache */
+ for_each_cbr_in_allocation_map(i, &cbrmap, scr)
+ gru_flush_cache(cbe + i * GRU_HANDLE_STRIDE);
+ mb(); /* Let the CL flush complete */
+
gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
@@ -533,7 +561,8 @@ void gru_unload_context(struct gru_thread_state *gts, int savestate)
zap_vma_ptes(gts->ts_vma, UGRUADDR(gts), GRU_GSEG_PAGESIZE);
cch = get_cch(gru->gs_gru_base_vaddr, ctxnum);
- gru_dbg(grudev, "gts %p\n", gts);
+ gru_dbg(grudev, "gts %p, cbrmap 0x%lx, dsrmap 0x%lx\n",
+ gts, gts->ts_cbr_map, gts->ts_dsr_map);
lock_cch_handle(cch);
if (cch_interrupt_sync(cch))
BUG();
@@ -549,7 +578,6 @@ void gru_unload_context(struct gru_thread_state *gts, int savestate)
if (cch_deallocate(cch))
BUG();
- gts->ts_force_unload = 0; /* ts_force_unload locked by CCH lock */
unlock_cch_handle(cch);
gru_free_gru_context(gts);
@@ -565,9 +593,7 @@ void gru_load_context(struct gru_thread_state *gts)
struct gru_context_configuration_handle *cch;
int i, err, asid, ctxnum = gts->ts_ctxnum;
- gru_dbg(grudev, "gts %p\n", gts);
cch = get_cch(gru->gs_gru_base_vaddr, ctxnum);
-
lock_cch_handle(cch);
cch->tfm_fault_bit_enable =
(gts->ts_user_options == GRU_OPT_MISS_FMM_POLL
@@ -591,6 +617,7 @@ void gru_load_context(struct gru_thread_state *gts)
cch->unmap_enable = 1;
cch->tfm_done_bit_enable = 1;
cch->cb_int_enable = 1;
+ cch->tlb_int_select = 0; /* For now, ints go to cpu 0 */
} else {
cch->unmap_enable = 0;
cch->tfm_done_bit_enable = 0;
@@ -616,17 +643,18 @@ void gru_load_context(struct gru_thread_state *gts)
if (cch_start(cch))
BUG();
unlock_cch_handle(cch);
+
+ gru_dbg(grudev, "gid %d, gts %p, cbrmap 0x%lx, dsrmap 0x%lx, tie %d, tis %d\n",
+ gts->ts_gru->gs_gid, gts, gts->ts_cbr_map, gts->ts_dsr_map,
+ (gts->ts_user_options == GRU_OPT_MISS_FMM_INTR), gts->ts_tlb_int_select);
}
/*
* Update fields in an active CCH:
* - retarget interrupts on local blade
* - update sizeavail mask
- * - force a delayed context unload by clearing the CCH asids. This
- * forces TLB misses for new GRU instructions. The context is unloaded
- * when the next TLB miss occurs.
*/
-int gru_update_cch(struct gru_thread_state *gts, int force_unload)
+int gru_update_cch(struct gru_thread_state *gts)
{
struct gru_context_configuration_handle *cch;
struct gru_state *gru = gts->ts_gru;
@@ -640,21 +668,13 @@ int gru_update_cch(struct gru_thread_state *gts, int force_unload)
goto exit;
if (cch_interrupt(cch))
BUG();
- if (!force_unload) {
- for (i = 0; i < 8; i++)
- cch->sizeavail[i] = gts->ts_sizeavail;
- gts->ts_tlb_int_select = gru_cpu_fault_map_id();
- cch->tlb_int_select = gru_cpu_fault_map_id();
- cch->tfm_fault_bit_enable =
- (gts->ts_user_options == GRU_OPT_MISS_FMM_POLL
- || gts->ts_user_options == GRU_OPT_MISS_FMM_INTR);
- } else {
- for (i = 0; i < 8; i++)
- cch->asid[i] = 0;
- cch->tfm_fault_bit_enable = 0;
- cch->tlb_int_enable = 0;
- gts->ts_force_unload = 1;
- }
+ for (i = 0; i < 8; i++)
+ cch->sizeavail[i] = gts->ts_sizeavail;
+ gts->ts_tlb_int_select = gru_cpu_fault_map_id();
+ cch->tlb_int_select = gru_cpu_fault_map_id();
+ cch->tfm_fault_bit_enable =
+ (gts->ts_user_options == GRU_OPT_MISS_FMM_POLL
+ || gts->ts_user_options == GRU_OPT_MISS_FMM_INTR);
if (cch_start(cch))
BUG();
ret = 1;
@@ -679,7 +699,54 @@ static int gru_retarget_intr(struct gru_thread_state *gts)
gru_dbg(grudev, "retarget from %d to %d\n", gts->ts_tlb_int_select,
gru_cpu_fault_map_id());
- return gru_update_cch(gts, 0);
+ 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.
+ */
+void gru_check_context_placement(struct gru_thread_state *gts)
+{
+ struct gru_state *gru;
+
+ /*
+ * 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;
+
+ if (!gru_check_chiplet_assignment(gru, gts)) {
+ STAT(check_context_unload);
+ gru_unload_context(gts, 1);
+ } else if (gru_retarget_intr(gts)) {
+ STAT(check_context_retarget_intr);
+ }
}
@@ -712,13 +779,17 @@ static void gts_stolen(struct gru_thread_state *gts,
}
}
-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;
+ blade_id = gts->ts_user_blade_id;
+ if (blade_id < 0)
+ blade_id = uv_numa_blade_id();
cbr = gts->ts_cbr_au_count;
dsr = gts->ts_dsr_au_count;
@@ -729,35 +800,39 @@ void gru_steal_context(struct gru_thread_state *gts, int blade_id)
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 (gru_check_chiplet_assignment(gru, gts)) {
+ 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) {
@@ -776,19 +851,34 @@ void gru_steal_context(struct gru_thread_state *gts, int blade_id)
}
/*
+ * 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;
-
+ 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 (!gru_check_chiplet_assignment(grux, gts))
+ continue;
if (check_gru_resources(grux, gts->ts_cbr_au_count,
gts->ts_dsr_au_count,
max_active_contexts)) {
@@ -809,12 +899,9 @@ 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);
@@ -842,7 +929,6 @@ int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
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",
@@ -857,28 +943,18 @@ int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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);