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lib: sbi: Add support to mask/unmask SSE events

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Add functions to globally mask/unmask supervisor software events
on the calling hart.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan
2024-09-23 11:26:26 +05:30
committed by Anup Patel
parent ebbd276146
commit b919daf495
4 changed files with 53 additions and 0 deletions
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2
include/sbi/sbi_ecall_interface.h
View File

@@ -342,6 +342,8 @@ enum sbi_cppc_reg_id {
#define SBI_EXT_SSE_DISABLE 0x00000005
#define SBI_EXT_SSE_COMPLETE 0x00000006
#define SBI_EXT_SSE_INJECT 0x00000007
#define SBI_EXT_SSE_HART_UNMASK 0x00000008
#define SBI_EXT_SSE_HART_MASK 0x00000009
/* SBI SSE Event Attributes. */
enum sbi_sse_attr_id {

2
include/sbi/sbi_sse.h
View File

@@ -78,6 +78,8 @@ void sbi_sse_exit(struct sbi_scratch *scratch);
int sbi_sse_register(uint32_t event_id, unsigned long handler_entry_pc,
unsigned long handler_entry_arg);
int sbi_sse_unregister(uint32_t event_id);
int sbi_sse_hart_mask(void);
int sbi_sse_hart_unmask(void);
int sbi_sse_enable(uint32_t event_id);
int sbi_sse_disable(uint32_t event_id);
int sbi_sse_complete(struct sbi_trap_regs *regs, struct sbi_ecall_return *out);

6
lib/sbi/sbi_ecall_sse.c
View File

@@ -36,6 +36,12 @@ static int sbi_ecall_sse_handler(unsigned long extid, unsigned long funcid,
case SBI_EXT_SSE_INJECT:
ret = sbi_sse_inject_from_ecall(regs->a0, regs->a1, out);
break;
case SBI_EXT_SSE_HART_MASK:
ret = sbi_sse_hart_mask();
break;
case SBI_EXT_SSE_HART_UNMASK:
ret = sbi_sse_hart_unmask();
break;
default:
ret = SBI_ENOTSUPP;
}

43
lib/sbi/sbi_sse.c
View File

@@ -142,6 +142,12 @@ struct sse_hart_state {
* List of local events allocated at boot time.
*/
struct sbi_sse_event *local_events;
/**
* State to track if the hart is ready to take sse events.
* One hart cannot modify this state of another hart.
*/
bool masked;
};
/**
@@ -610,6 +616,10 @@ void sbi_sse_process_pending_events(struct sbi_trap_regs *regs)
struct sbi_sse_event *e;
struct sse_hart_state *state = sse_thishart_state_ptr();
/* if sse is masked on this hart, do nothing */
if (state->masked)
return;
spin_lock(&state->enabled_event_lock);
sbi_list_for_each_entry(e, &state->enabled_event_list, node) {
@@ -807,6 +817,36 @@ int sbi_sse_disable(uint32_t event_id)
return ret;
}
int sbi_sse_hart_mask(void)
{
struct sse_hart_state *state = sse_thishart_state_ptr();
if (!state)
return SBI_EFAIL;
if (state->masked)
return SBI_EALREADY_STARTED;
state->masked = true;
return SBI_SUCCESS;
}
int sbi_sse_hart_unmask(void)
{
struct sse_hart_state *state = sse_thishart_state_ptr();
if (!state)
return SBI_EFAIL;
if (!state->masked)
return SBI_EALREADY_STOPPED;
state->masked = false;
return SBI_SUCCESS;
}
int sbi_sse_inject_from_ecall(uint32_t event_id, unsigned long hartid,
struct sbi_ecall_return *out)
{
@@ -1127,6 +1167,9 @@ int sbi_sse_init(struct sbi_scratch *scratch, bool cold_boot)
shs->local_events = (struct sbi_sse_event *)(shs + 1);
/* SSE events are masked until hart unmasks them */
shs->masked = true;
sse_set_hart_state_ptr(scratch, shs);
}