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lib: sbi_scratch: Introduce sbi_scratch_last_hartid() API

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The patch adds sbi_scratch_last_hartid() API which returns
last HART id having a scratch space. We can use this new API
to optimize places where we iterate over HART id from 0 to
SBI_HARTMASK_MAX_BITS.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-03-26 18:35:38 +05:30
committed by Anup Patel
parent 5b6957eed7
commit dd0f21c560
4 changed files with 13 additions and 4 deletions
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6
include/sbi/sbi_scratch.h
View File

@@ -113,6 +113,12 @@ extern struct sbi_scratch *hartid_to_scratch_table[];
#define sbi_hartid_to_scratch(__hartid) \
hartid_to_scratch_table[__hartid]
/** Last HART id having a sbi_scratch pointer */
extern u32 last_hartid_having_scratch;
/** Get last HART id having a sbi_scratch pointer */
#define sbi_scratch_last_hartid() last_hartid_having_scratch
#endif
#endif

4
lib/sbi/sbi_hsm.c
View File

@@ -88,7 +88,7 @@ bool sbi_hsm_hart_started(u32 hartid)
int sbi_hsm_hart_started_mask(ulong hbase, ulong *out_hmask)
{
ulong i;
ulong hcount = SBI_HARTMASK_MAX_BITS;
ulong hcount = sbi_scratch_last_hartid() + 1;
*out_hmask = 0;
if (hcount <= hbase)
@@ -153,7 +153,7 @@ int sbi_hsm_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot)
return SBI_ENOMEM;
/* Initialize hart state data for every hart */
for (i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
for (i = 0; i <= sbi_scratch_last_hartid(); i++) {
rscratch = sbi_hartid_to_scratch(i);
if (!rscratch)
continue;

2
lib/sbi/sbi_init.c
View File

@@ -128,7 +128,7 @@ static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)
coldboot_done = 1;
/* Send an IPI to all HARTs waiting for coldboot */
for (int i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
for (int i = 0; i <= sbi_scratch_last_hartid(); i++) {
if ((i != hartid) &&
sbi_hartmask_test_hart(i, &coldboot_wait_hmask))
sbi_platform_ipi_send(plat, i);

5
lib/sbi/sbi_scratch.c
View File

@@ -14,6 +14,7 @@
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_string.h>
u32 last_hartid_having_scratch = SBI_HARTMASK_MAX_BITS;
struct sbi_scratch *hartid_to_scratch_table[SBI_HARTMASK_MAX_BITS] = { 0 };
static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
@@ -32,6 +33,8 @@ int sbi_scratch_init(struct sbi_scratch *scratch)
hartid_to_scratch_table[i] =
((hartid2scratch)scratch->hartid_to_scratch)(i,
sbi_platform_hart_index(plat, i));
if (hartid_to_scratch_table[i])
last_hartid_having_scratch = i;
}
return 0;
@@ -71,7 +74,7 @@ done:
spin_unlock(&extra_lock);
if (ret) {
for (i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
for (i = 0; i < sbi_scratch_last_hartid(); i++) {
rscratch = sbi_hartid_to_scratch(i);
if (!rscratch)
continue;