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lib: sbi: Extend sbi_hsm_hart_start() for domains 

The sbi_hsm_hart_start() should consider the domain under which we
are trying to start the HART. This will help ensure that HART A can
start HART B only if both HARTs A and B belong to the same domain.

We also have a special case when we bring-up boot HART of non-root
domains in sbi_domain_finalize() where we should skip domain checks
in sbi_hsm_hart_start(). To achieve this, sbi_hsm_hart_start() should
do domain checks only when domain parameter is non-NULL.

This patch extends sbi_hsm_hart_start() as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-09-19 14:26:52 +05:30 committed by Anup Patel
parent e73b92d862
commit 3a30d2c34d
4 changed files with 19 additions and 15 deletions
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5
include/sbi/sbi_hsm.h
View File

@ -25,8 +25,9 @@ struct sbi_scratch;
int sbi_hsm_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot);
void __noreturn sbi_hsm_exit(struct sbi_scratch *scratch);
int sbi_hsm_hart_start(struct sbi_scratch *scratch, u32 hartid,
ulong saddr, ulong smode, ulong priv);
int sbi_hsm_hart_start(struct sbi_scratch *scratch,
const struct sbi_domain *dom,
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);

6
lib/sbi/sbi_domain.c
View File

@ -324,8 +324,10 @@ int sbi_domain_finalize(struct sbi_scratch *scratch, u32 cold_hartid)
scratch->next_mode = dom->next_mode;
scratch->next_arg1 = dom->next_arg1;
} else {
rc = sbi_hsm_hart_start(scratch, dhart, dom->next_addr,
dom->next_mode, dom->next_arg1);
rc = sbi_hsm_hart_start(scratch, NULL, dhart,
dom->next_addr,
dom->next_mode,
dom->next_arg1);
if (rc)
return rc;
}

4
lib/sbi/sbi_ecall_hsm.c
View File

@ -28,8 +28,8 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
case SBI_EXT_HSM_HART_START:
smode = csr_read(CSR_MSTATUS);
smode = (smode & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
ret = sbi_hsm_hart_start(scratch, args[0], args[1],
smode, args[2]);
ret = sbi_hsm_hart_start(scratch, sbi_domain_thishart_ptr(),
args[0], args[1], smode, args[2]);
break;
case SBI_EXT_HSM_HART_STOP:
ret = sbi_hsm_hart_stop(scratch, TRUE);

19
lib/sbi/sbi_hsm.c
View File

@ -205,17 +205,23 @@ fail_exit:
sbi_hart_hang();
}
int sbi_hsm_hart_start(struct sbi_scratch *scratch, u32 hartid,
ulong saddr, ulong smode, ulong priv)
int sbi_hsm_hart_start(struct sbi_scratch *scratch,
const struct sbi_domain *dom,
u32 hartid, ulong saddr, ulong smode, ulong priv)
{
int rc;
unsigned long init_count;
unsigned int hstate;
struct sbi_scratch *rscratch;
struct sbi_hsm_data *hdata;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (smode != PRV_M && smode != PRV_S && smode != PRV_U)
/* For now, we only allow start mode to be S-mode or U-mode. */
if (smode != PRV_S && smode != PRV_U)
return SBI_EINVAL;
if (dom && !sbi_domain_is_assigned_hart(dom, hartid))
return SBI_EINVAL;
if (dom && !sbi_domain_check_addr(dom, saddr, smode,
SBI_DOMAIN_EXECUTE))
return SBI_EINVAL;
rscratch = sbi_hartid_to_scratch(hartid);
@ -234,11 +240,6 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch, u32 hartid,
if (hstate != SBI_HART_STOPPED)
return SBI_EINVAL;
rc = sbi_hart_pmp_check_addr(scratch, saddr, smode, PMP_X);
if (rc)
return rc;
//TODO: We also need to check saddr for valid physical address as well.
init_count = sbi_init_count(hartid);
rscratch->next_arg1 = priv;
rscratch->next_addr = saddr;