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cpu/amd/microcode: Introduce CBFS access spinlock to avoid IOMMU failure

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When microcode updates are enabled, this fixes an issue identical
to that described in GIT hash 7b22d84d:
 * drivers/pc80: Add optional spinlock for nvram CBFS access

Change-Id: Ib7e8cb171f44833167053ca98a85cca23021dfba
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/12063
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Timothy Pearson
2015-08-28 20:48:17 -05:00
committed by Martin Roth
parent 046d217420
commit c764c7488b
3 changed files with 28 additions and 2 deletions
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7
src/arch/x86/include/arch/smp/spinlock.h
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@@ -1,7 +1,10 @@
#ifndef ARCH_SMP_SPINLOCK_H
#define ARCH_SMP_SPINLOCK_H
#if !defined(__PRE_RAM__) || IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK) || IS_ENABLED(CONFIG_HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK)
#if !defined(__PRE_RAM__) \
|| IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK) \
|| IS_ENABLED(CONFIG_HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK) \
|| IS_ENABLED(CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK)
/*
* Your basic SMP spinlocks, allowing only a single CPU anywhere
@@ -16,6 +19,8 @@ spinlock_t *romstage_console_lock(void);
void initialize_romstage_console_lock(void);
spinlock_t* romstage_nvram_cbfs_lock(void);
void initialize_romstage_nvram_cbfs_lock(void);
spinlock_t* romstage_microcode_cbfs_lock(void);
void initialize_romstage_microcode_cbfs_lock(void);
#endif
#define SPIN_LOCK_UNLOCKED (spinlock_t) { 1 }