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lib: sbi: Use SBI_HSM_STATE_xyz defines instead of SBI_STATE_xyz defines

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We replace the use of SBI_STATE_xyz defines with SBI_HSM_STATE_xyz
defines because the HSM state defines are complete enough to implement
HSM state machine in OpenSBI. As a result of this, we can now remove
sbi_hsm_hart_state_to_status() function because it is now redundant
and sbi_hsm_hart_get_state() can directly return HSM state or error.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2021-02-01 16:13:03 +05:30
committed by Anup Patel
parent 5487cf095d
commit 8df1f9a0d3
3 changed files with 24 additions and 55 deletions
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8
include/sbi/sbi_hsm.h
View File

@@ -12,13 +12,6 @@
#include <sbi/sbi_types.h>
/** Hart state values **/
#define SBI_HART_STOPPED 0
#define SBI_HART_STOPPING 1
#define SBI_HART_STARTING 2
#define SBI_HART_STARTED 3
#define SBI_HART_UNKNOWN 4
struct sbi_domain;
struct sbi_scratch;
@@ -30,7 +23,6 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
u32 hartid, ulong saddr, ulong smode, ulong priv);
int sbi_hsm_hart_stop(struct sbi_scratch *scratch, bool exitnow);
int sbi_hsm_hart_get_state(const struct sbi_domain *dom, u32 hartid);
int sbi_hsm_hart_state_to_status(int state);
int sbi_hsm_hart_started_mask(const struct sbi_domain *dom,
ulong hbase, ulong *out_hmask);
void sbi_hsm_prepare_next_jump(struct sbi_scratch *scratch, u32 hartid);

7
lib/sbi/sbi_ecall_hsm.c
View File

@@ -23,7 +23,7 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
struct sbi_trap_info *out_trap)
{
ulong smode;
int ret = 0, hstate;
int ret = 0;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
switch (funcid) {
@@ -37,9 +37,8 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
ret = sbi_hsm_hart_stop(scratch, TRUE);
break;
case SBI_EXT_HSM_HART_GET_STATUS:
hstate = sbi_hsm_hart_get_state(sbi_domain_thishart_ptr(),
regs->a0);
ret = sbi_hsm_hart_state_to_status(hstate);
ret = sbi_hsm_hart_get_state(sbi_domain_thishart_ptr(),
regs->a0);
break;
default:
ret = SBI_ENOTSUPP;

64
lib/sbi/sbi_hsm.c
View File

@@ -33,30 +33,6 @@ struct sbi_hsm_data {
atomic_t state;
};
int sbi_hsm_hart_state_to_status(int state)
{
int ret;
switch (state) {
case SBI_HART_STOPPED:
ret = SBI_HSM_STATE_STOPPED;
break;
case SBI_HART_STOPPING:
ret = SBI_HSM_STATE_STOP_PENDING;
break;
case SBI_HART_STARTING:
ret = SBI_HSM_STATE_START_PENDING;
break;
case SBI_HART_STARTED:
ret = SBI_HSM_STATE_STARTED;
break;
default:
ret = SBI_EINVAL;
}
return ret;
}
static inline int __sbi_hsm_hart_get_state(u32 hartid)
{
struct sbi_hsm_data *hdata;
@@ -64,7 +40,7 @@ static inline int __sbi_hsm_hart_get_state(u32 hartid)
scratch = sbi_hartid_to_scratch(hartid);
if (!scratch)
return SBI_HART_UNKNOWN;
return SBI_EINVAL;
hdata = sbi_scratch_offset_ptr(scratch, hart_data_offset);
return atomic_read(&hdata->state);
@@ -73,14 +49,14 @@ static inline int __sbi_hsm_hart_get_state(u32 hartid)
int sbi_hsm_hart_get_state(const struct sbi_domain *dom, u32 hartid)
{
if (!sbi_domain_is_assigned_hart(dom, hartid))
return SBI_HART_UNKNOWN;
return SBI_EINVAL;
return __sbi_hsm_hart_get_state(hartid);
}
static bool sbi_hsm_hart_started(const struct sbi_domain *dom, u32 hartid)
{
if (sbi_hsm_hart_get_state(dom, hartid) == SBI_HART_STARTED)
if (sbi_hsm_hart_get_state(dom, hartid) == SBI_HSM_STATE_STARTED)
return TRUE;
else
return FALSE;
@@ -110,7 +86,7 @@ int sbi_hsm_hart_started_mask(const struct sbi_domain *dom,
for (i = hbase; i < hend; i++) {
hmask = 1UL << (i - hbase);
if ((dmask & hmask) &&
(__sbi_hsm_hart_get_state(i) == SBI_HART_STARTED))
(__sbi_hsm_hart_get_state(i) == SBI_HSM_STATE_STARTED))
*out_hmask |= hmask;
}
@@ -123,9 +99,9 @@ void sbi_hsm_prepare_next_jump(struct sbi_scratch *scratch, u32 hartid)
struct sbi_hsm_data *hdata = sbi_scratch_offset_ptr(scratch,
hart_data_offset);
oldstate = atomic_cmpxchg(&hdata->state, SBI_HART_STARTING,
SBI_HART_STARTED);
if (oldstate != SBI_HART_STARTING)
oldstate = atomic_cmpxchg(&hdata->state, SBI_HSM_STATE_START_PENDING,
SBI_HSM_STATE_STARTED);
if (oldstate != SBI_HSM_STATE_START_PENDING)
sbi_hart_hang();
}
@@ -142,7 +118,7 @@ static void sbi_hsm_hart_wait(struct sbi_scratch *scratch, u32 hartid)
csr_set(CSR_MIE, MIP_MSIP);
/* Wait for hart_add call*/
while (atomic_read(&hdata->state) != SBI_HART_STARTING) {
while (atomic_read(&hdata->state) != SBI_HSM_STATE_START_PENDING) {
wfi();
};
@@ -174,7 +150,9 @@ int sbi_hsm_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot)
hdata = sbi_scratch_offset_ptr(rscratch,
hart_data_offset);
ATOMIC_INIT(&hdata->state,
(i == hartid) ? SBI_HART_STARTING : SBI_HART_STOPPED);
(i == hartid) ?
SBI_HSM_STATE_START_PENDING :
SBI_HSM_STATE_STOPPED);
}
} else {
sbi_hsm_hart_wait(scratch, hartid);
@@ -191,9 +169,9 @@ void __noreturn sbi_hsm_exit(struct sbi_scratch *scratch)
hart_data_offset);
void (*jump_warmboot)(void) = (void (*)(void))scratch->warmboot_addr;
hstate = atomic_cmpxchg(&hdata->state, SBI_HART_STOPPING,
SBI_HART_STOPPED);
if (hstate != SBI_HART_STOPPING)
hstate = atomic_cmpxchg(&hdata->state, SBI_HSM_STATE_STOP_PENDING,
SBI_HSM_STATE_STOPPED);
if (hstate != SBI_HSM_STATE_STOP_PENDING)
goto fail_exit;
if (sbi_platform_has_hart_hotplug(plat)) {
@@ -238,16 +216,16 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
if (!rscratch)
return SBI_EINVAL;
hdata = sbi_scratch_offset_ptr(rscratch, hart_data_offset);
hstate = atomic_cmpxchg(&hdata->state, SBI_HART_STOPPED,
SBI_HART_STARTING);
if (hstate == SBI_HART_STARTED)
hstate = atomic_cmpxchg(&hdata->state, SBI_HSM_STATE_STOPPED,
SBI_HSM_STATE_START_PENDING);
if (hstate == SBI_HSM_STATE_STARTED)
return SBI_EALREADY;
/**
* if a hart is already transition to start or stop, another start call
* is considered as invalid request.
*/
if (hstate != SBI_HART_STOPPED)
if (hstate != SBI_HSM_STATE_STOPPED)
return SBI_EINVAL;
init_count = sbi_init_count(hartid);
@@ -276,9 +254,9 @@ int sbi_hsm_hart_stop(struct sbi_scratch *scratch, bool exitnow)
if (!sbi_hsm_hart_started(sbi_domain_thishart_ptr(), hartid))
return SBI_EINVAL;
oldstate = atomic_cmpxchg(&hdata->state, SBI_HART_STARTED,
SBI_HART_STOPPING);
if (oldstate != SBI_HART_STARTED) {
oldstate = atomic_cmpxchg(&hdata->state, SBI_HSM_STATE_STARTED,
SBI_HSM_STATE_STOP_PENDING);
if (oldstate != SBI_HSM_STATE_STARTED) {
sbi_printf("%s: ERR: The hart is in invalid state [%u]\n",
__func__, oldstate);
return SBI_EDENIED;