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gru: check context state on reload 

Check whether the gru state being loaded into a gru is from a new context
or a previously unloaded context.  If new, simply zero out the hardware
context; if unloaded and valid, reload the old state.

This change is primarily for reloading kernel contexts where the previous
is not required to be saved.

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 2009-06-17 16:28:24 -07:00 committed by Linus Torvalds
parent 17b49a67a6
commit 940229b9c0
2 changed files with 25 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/misc/sgi-gru/grumain.c
View File

@ -307,11 +307,12 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma,
bytes = DSR_BYTES(dsr_au_count) + CBR_BYTES(cbr_au_count);
bytes += sizeof(struct gru_thread_state);
gts = kzalloc(bytes, GFP_KERNEL);
gts = kmalloc(bytes, GFP_KERNEL);
if (!gts)
return NULL;
STAT(gts_alloc);
memset(gts, 0, sizeof(struct gru_thread_state)); /* zero out header */
atomic_set(&gts->ts_refcnt, 1);
mutex_init(&gts->ts_ctxlock);
gts->ts_cbr_au_count = cbr_au_count;
@ -458,7 +459,8 @@ static void gru_prefetch_context(void *gseg, void *cb, void *cbe,
}
static void gru_load_context_data(void *save, void *grubase, int ctxnum,
unsigned long cbrmap, unsigned long dsrmap)
unsigned long cbrmap, unsigned long dsrmap,
int data_valid)
{
void *gseg, *cb, *cbe;
unsigned long length;
@ -471,12 +473,22 @@ static void gru_load_context_data(void *save, void *grubase, int ctxnum,
gru_prefetch_context(gseg, cb, cbe, cbrmap, length);
for_each_cbr_in_allocation_map(i, &cbrmap, scr) {
save += gru_copy_handle(cb, save);
save += gru_copy_handle(cbe + i * GRU_HANDLE_STRIDE, save);
if (data_valid) {
save += gru_copy_handle(cb, save);
save += gru_copy_handle(cbe + i * GRU_HANDLE_STRIDE,
save);
} else {
memset(cb, 0, GRU_CACHE_LINE_BYTES);
memset(cbe + i * GRU_HANDLE_STRIDE, 0,
GRU_CACHE_LINE_BYTES);
}
cb += GRU_HANDLE_STRIDE;
}
memcpy(gseg + GRU_DS_BASE, save, length);
if (data_valid)
memcpy(gseg + GRU_DS_BASE, save, length);
else
memset(gseg + GRU_DS_BASE, 0, length);
}
static void gru_unload_context_data(void *save, void *grubase, int ctxnum,
@ -517,10 +529,12 @@ void gru_unload_context(struct gru_thread_state *gts, int savestate)
if (!is_kernel_context(gts))
gru_unload_mm_tracker(gru, gts);
if (savestate)
if (savestate) {
gru_unload_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr,
ctxnum, gts->ts_cbr_map,
gts->ts_dsr_map);
gts->ts_data_valid = 1;
}
if (cch_deallocate(cch))
BUG();
@ -576,7 +590,7 @@ void gru_load_context(struct gru_thread_state *gts)
}
gru_load_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr, ctxnum,
gts->ts_cbr_map, gts->ts_dsr_map);
gts->ts_cbr_map, gts->ts_dsr_map, gts->ts_data_valid);
if (cch_start(cch))
BUG();
@ -611,8 +625,8 @@ int gru_update_cch(struct gru_thread_state *gts, int force_unload)
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);
(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;

2
drivers/misc/sgi-gru/grutables.h
View File

@ -385,6 +385,8 @@ struct gru_thread_state {
after migration */
char ts_cbr_idx[GRU_CBR_AU];/* CBR numbers of each
allocated CB */
int ts_data_valid; /* Indicates if ts_gdata has
valid data */
unsigned long ts_gdata[0]; /* save area for GRU data (CB,
DS, CBE) */
};