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| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2021-10-15 17:14:20 +0300 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2022-02-05 07:49:21 +0000 |
| commit | 7aea15aa6b59c96a6d4c0c847352dd1c45145c7c (patch) | |
| tree | ab2ca87ac0ded85bd6f8e2d056ea935f2503541f | |
| parent | 710bdc42a5f409261335495c03882e2b133a384c (diff) | |
cpu/x86/lapic: Fix choice X2APIC_ONLY
When sending self an IPI, some instructions may be processed
before IPI is serviced. Spend some time doing nothing, to
avoid entering a printk() and acquiring console_lock and
dead-locking.
Change-Id: I78070ae91e78c11c3e3aa225e5673d4667d6f7bb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60213
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
| -rw-r--r-- | src/include/cpu/x86/lapic.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/include/cpu/x86/lapic.h b/src/include/cpu/x86/lapic.h index c1603f21f0..e131d2ec46 100644 --- a/src/include/cpu/x86/lapic.h +++ b/src/include/cpu/x86/lapic.h @@ -145,8 +145,16 @@ static __always_inline unsigned int lapicid(void) static __always_inline void lapic_send_ipi_self(uint32_t icrlow) { + int i = 1000; + /* LAPIC_DEST_SELF does not support all delivery mode -fields. */ lapic_send_ipi(icrlow, lapicid()); + + /* In case of X2APIC force a short delay, to prevent deadlock in a case + * the immediately following code acquires some lock, like with printk(). + */ + while (CONFIG(X2APIC_ONLY) && i--) + cpu_relax(); } static __always_inline void lapic_send_ipi_others(uint32_t icrlow) |