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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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19
src/cpu/amd/microcode/microcode.c
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@@ -20,6 +20,7 @@
#include <cpu/amd/microcode.h>
#include <cbfs.h>
#include <arch/io.h>
#include <smp/spinlock.h>
#define UCODE_DEBUG(fmt, args...) \
do { printk(BIOS_DEBUG, "[microcode] "fmt, ##args); } while(0)
@@ -197,14 +198,30 @@ void amd_update_microcode_from_cbfs(uint32_t equivalent_processor_rev_id)
return;
}
#ifdef __PRE_RAM__
#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK)
spin_lock(romstage_microcode_cbfs_lock());
#endif
#endif
ucode = cbfs_boot_map_with_leak(microcode_cbfs_file[i],
CBFS_TYPE_MICROCODE, &ucode_len);
if (!ucode) {
UCODE_DEBUG("microcode file not found. Skipping updates.\n");
#ifdef __PRE_RAM__
#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK)
spin_unlock(romstage_microcode_cbfs_lock());
#endif
#endif
return;
}
amd_update_microcode(ucode, ucode_len, equivalent_processor_rev_id);
#ifdef __PRE_RAM__
#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK)
spin_unlock(romstage_microcode_cbfs_lock());
#endif
#endif
}
}