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lib: Move all coldboot wait APIs to sbi_init.c

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The coldboot wait APIs are only used by sbi_init.c so no point in
having coldboot related code in sbi_hart.c.

As per-above rationale, we move all coldboot wait related APIs to
sbi_init.c as static/local functions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Anup Patel 2020-03-02 16:50:01 +05:30 • committed by Anup Patel
parent d96316481d
commit 71d2b837c4
3 changed files with 70 additions and 76 deletions
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4
include/sbi/sbi_hart.h
View file

@ -41,10 +41,6 @@ void sbi_hart_unmark_available(u32 hartid);
struct sbi_scratch *sbi_hart_id_to_scratch(struct sbi_scratch *scratch,
u32 hartid);
void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid);
void sbi_hart_wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid);
u32 sbi_current_hartid(void);
#endif

70
lib/sbi/sbi_hart.c
View file

@ -377,73 +377,3 @@ struct sbi_scratch *sbi_hart_id_to_scratch(struct sbi_scratch *scratch,
{
return ((h2s)scratch->hartid_to_scratch)(hartid);
}
#define COLDBOOT_WAIT_BITMAP_SIZE __riscv_xlen
static spinlock_t coldboot_lock = SPIN_LOCK_INITIALIZER;
static unsigned long coldboot_done = 0;
static unsigned long coldboot_wait_bitmap = 0;
void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
{
unsigned long saved_mie, cmip;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if ((sbi_platform_hart_count(plat) <= hartid) ||
(COLDBOOT_WAIT_BITMAP_SIZE <= hartid))
sbi_hart_hang();
/* Save MIE CSR */
saved_mie = csr_read(CSR_MIE);
/* Set MSIE bit to receive IPI */
csr_set(CSR_MIE, MIP_MSIP);
/* Acquire coldboot lock */
spin_lock(&coldboot_lock);
/* Mark current HART as waiting */
coldboot_wait_bitmap |= (1UL << hartid);
/* Wait for coldboot to finish using WFI */
while (!coldboot_done) {
spin_unlock(&coldboot_lock);
do {
wfi();
cmip = csr_read(CSR_MIP);
} while (!(cmip & MIP_MSIP));
spin_lock(&coldboot_lock);
};
/* Unmark current HART as waiting */
coldboot_wait_bitmap &= ~(1UL << hartid);
/* Release coldboot lock */
spin_unlock(&coldboot_lock);
/* Restore MIE CSR */
csr_write(CSR_MIE, saved_mie);
/* Clear current HART IPI */
sbi_platform_ipi_clear(plat, hartid);
}
void sbi_hart_wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)
{
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
int max_hart = sbi_platform_hart_count(plat);
/* Acquire coldboot lock */
spin_lock(&coldboot_lock);
/* Mark coldboot done */
coldboot_done = 1;
/* Send an IPI to all HARTs waiting for coldboot */
for (int i = 0; i < max_hart; i++) {
if ((i != hartid) && (coldboot_wait_bitmap & (1UL << i)))
sbi_platform_ipi_send(plat, i);
}
/* Release coldboot lock */
spin_unlock(&coldboot_lock);
}

72
lib/sbi/sbi_init.c
View file

@ -9,6 +9,7 @@
#include <sbi/riscv_asm.h>
#include <sbi/riscv_atomic.h>
#include <sbi/riscv_locks.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_hart.h>
@ -74,6 +75,73 @@ static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
sbi_hart_pmp_dump(scratch);
}
#define COLDBOOT_WAIT_BITMAP_SIZE __riscv_xlen
static spinlock_t coldboot_lock = SPIN_LOCK_INITIALIZER;
static unsigned long coldboot_done = 0;
static unsigned long coldboot_wait_bitmap = 0;
static void wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
{
unsigned long saved_mie;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if ((sbi_platform_hart_count(plat) <= hartid) ||
(COLDBOOT_WAIT_BITMAP_SIZE <= hartid))
sbi_hart_hang();
/* Save MIE CSR */
saved_mie = csr_read(CSR_MIE);
/* Set MSIE bit to receive IPI */
csr_set(CSR_MIE, MIP_MSIP);
/* Acquire coldboot lock */
spin_lock(&coldboot_lock);
/* Mark current HART as waiting */
coldboot_wait_bitmap |= (1UL << hartid);
/* Wait for coldboot to finish using WFI */
while (!coldboot_done) {
spin_unlock(&coldboot_lock);
wfi();
spin_lock(&coldboot_lock);
};
/* Unmark current HART as waiting */
coldboot_wait_bitmap &= ~(1UL << hartid);
/* Release coldboot lock */
spin_unlock(&coldboot_lock);
/* Restore MIE CSR */
csr_write(CSR_MIE, saved_mie);
/* Clear current HART IPI */
sbi_platform_ipi_clear(plat, hartid);
}
static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)
{
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
int max_hart = sbi_platform_hart_count(plat);
/* Acquire coldboot lock */
spin_lock(&coldboot_lock);
/* Mark coldboot done */
coldboot_done = 1;
/* Send an IPI to all HARTs waiting for coldboot */
for (int i = 0; i < max_hart; i++) {
if ((i != hartid) && (coldboot_wait_bitmap & (1UL << i)))
sbi_platform_ipi_send(plat, i);
}
/* Release coldboot lock */
spin_unlock(&coldboot_lock);
}
static unsigned long init_count_offset;
static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
@ -130,7 +198,7 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
if (!(scratch->options & SBI_SCRATCH_NO_BOOT_PRINTS))
sbi_boot_prints(scratch, hartid);
sbi_hart_wake_coldboot_harts(scratch, hartid);
wake_coldboot_harts(scratch, hartid);
sbi_hart_mark_available(hartid);
@ -148,7 +216,7 @@ static void __noreturn init_warmboot(struct sbi_scratch *scratch, u32 hartid)
unsigned long *init_count;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
sbi_hart_wait_for_coldboot(scratch, hartid);
wait_for_coldboot(scratch, hartid);
if (!init_count_offset)
sbi_hart_hang();