Patch set updated for coreboot: cpu/amd/microcode: Introduce CBFS access spinlock to avoid IOMMU failure

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12063

-gerrit

commit 66525594fa1976aae7d7f97e4b7455fc66e900df
Author: Timothy Pearson 
Date:   Fri Aug 28 20:48:17 2015 -0500

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

Change-Id: Ib7e8cb171f44833167053ca98a85cca23021dfba
    Signed-off-by: Timothy Pearson 
---
 src/Kconfig                              |  4 ++++
 src/arch/x86/include/arch/smp/spinlock.h |  7 ++++++-
 src/cpu/amd/microcode/microcode.c        | 24 +++++++++++++++++++++++-
 src/mainboard/asus/kgpe-d16/Kconfig      |  1 +
 src/mainboard/asus/kgpe-d16/romstage.c   | 15 ++++++++++++++-
 5 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/src/Kconfig b/src/Kconfig
index b85e381..5d5da98 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -455,6 +455,10 @@ config HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK
    bool
    default n

+config HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK
+	bool
+	default n
+
 config HAVE_MONOTONIC_TIMER
    def_bool n
    help
diff --git a/src/arch/x86/include/arch/smp/spinlock.h b/src/arch/x86/include/arch/smp/spinlock.h
index cf142a9..291c943 100644
--- a/src/arch/x86/include/arch/smp/spinlock.h
+++ b/src/arch/x86/include/arch/smp/spinlock.h
@@ -1,7 +1,10 @@
 #ifndef ARCH_SMP_SPINLOCK_H
 #define ARCH_SMP_SPINLOCK_H

-#if !defined(__PRE_RAM__) || defined(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK) || defined(CONFIG_HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK)
+#if !defined(__PRE_RAM__) \
+	|| defined(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)	\
+	|| defined(CONFIG_HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK)	\
+	|| defined(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 }
diff --git a/src/cpu/amd/microcode/microcode.c b/src/cpu/amd/microcode/microcode.c
index badd3b7..bf644ab 100644
--- a/src/cpu/amd/microcode/microcode.c
+++ b/src/cpu/amd/microcode/microcode.c
@@ -25,6 +25,12 @@
 #include <cbfs.h>
 #include <arch/io.h>

+#ifdef __PRE_RAM__
+#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK)
+#include <smp/spinlock.h>
+#endif
+#endif
+
 #define UCODE_DEBUG(fmt, args...)	\
    do { printk(BIOS_DEBUG, "[microcode] "fmt, ##args); } while(0)

@@ -201,14 +207,30 @@ 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
    }
 }
diff --git a/src/mainboard/asus/kgpe-d16/Kconfig b/src/mainboard/asus/kgpe-d16/Kconfig
index a9261f9..ff9afd3 100644
--- a/src/mainboard/asus/kgpe-d16/Kconfig
+++ b/src/mainboard/asus/kgpe-d16/Kconfig
@@ -16,6 +16,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
    select PARALLEL_CPU_INIT
    select HAVE_ROMSTAGE_CONSOLE_SPINLOCK
    select HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK
+	select HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK
    select HAVE_HARD_RESET
    select HAVE_OPTION_TABLE
    select HAVE_CMOS_DEFAULT
diff --git a/src/mainboard/asus/kgpe-d16/romstage.c b/src/mainboard/asus/kgpe-d16/romstage.c
index 9998359..d1b75b6 100644
--- a/src/mainboard/asus/kgpe-d16/romstage.c
+++ b/src/mainboard/asus/kgpe-d16/romstage.c
@@ -327,6 +327,18 @@ void initialize_romstage_nvram_cbfs_lock(void)
    car_get_var(nvram_cbfs_spinlock) = SPIN_LOCK_UNLOCKED;
 }

+static spinlock_t microcode_cbfs_spinlock CAR_GLOBAL;
+
+spinlock_t* romstage_microcode_cbfs_lock(void)
+{
+	return car_get_var_ptr(&microcode_cbfs_spinlock);
+}
+
+void initialize_romstage_microcode_cbfs_lock(void)
+{
+	car_get_var(microcode_cbfs_spinlock) = SPIN_LOCK_UNLOCKED;
+}
+
 void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
 {
    uint32_t esp;
@@ -348,9 +360,10 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
    	timestamp_init(timestamp_get());
    	timestamp_add_now(TS_START_ROMSTAGE);

-		/* Initialize the printk and nvram CBFS spinlocks */
+		/* Initialize the printk, nvram CBFS, and microcode CBFS spinlocks */
    	initialize_romstage_console_lock();
    	initialize_romstage_nvram_cbfs_lock();
+		initialize_romstage_microcode_cbfs_lock();

/* Nothing special needs to be done to find bus 0 */
    	/* Allow the HT devices to be found */