[coreboot-gerrit] Patch set updated for coreboot: ACPI S3: Remove HIGH_MEMORY_SAVE where possible
Kyösti Mälkki (kyosti.malkki@gmail.com)
gerrit at coreboot.org
Tue Nov 8 00:50:13 CET 2016
Kyösti Mälkki (kyosti.malkki at gmail.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15255
-gerrit
commit ddabe6df8c996b8e174439d6462e9ea13db52c11
Author: Kyösti Mälkki <kyosti.malkki at gmail.com>
Date: Tue Jun 28 07:38:46 2016 +0300
ACPI S3: Remove HIGH_MEMORY_SAVE where possible
Add implementation to use actual requirements of ramstage size
for S3 resume backup in CBMEM. The backup covers complete pages of 4 KiB.
Only the required amount of low memory is backed up when ACPI_TINY_LOWMEM_BACKUP
is selected for the platform. Enable this option for AGESA and binaryPI, other
platforms (without RELOCATABLE_RAMSTAGE) currently keep their romstage ramstack
in low memory for s3 resume path.
Change-Id: Ide7ce013f3727c2928cdb00fbcc7e7e84e859ff1
Signed-off-by: Kyösti Mälkki <kyosti.malkki at gmail.com>
---
src/Kconfig | 8 +++
src/arch/x86/acpi_s3.c | 133 +++++++++++++++++++++++++++++++-----
src/arch/x86/include/arch/acpi.h | 12 ++--
src/cpu/amd/agesa/Kconfig | 1 +
src/cpu/amd/car/post_cache_as_ram.c | 4 +-
src/cpu/amd/pi/Kconfig | 1 +
src/include/cbfs.h | 3 +
src/include/program_loading.h | 4 ++
src/lib/cbfs.c | 12 ++++
src/lib/prog_loaders.c | 14 +++-
10 files changed, 166 insertions(+), 26 deletions(-)
diff --git a/src/Kconfig b/src/Kconfig
index d6af6eb..6623e0d 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -539,6 +539,14 @@ config HAVE_ACPI_RESUME
bool
default n
+config ACPI_TINY_LOWMEM_BACKUP
+ bool
+ default n
+
+config ACPI_HUGE_LOWMEM_BACKUP
+ bool
+ default !ACPI_TINY_LOWMEM_BACKUP
+
config RESUME_PATH_SAME_AS_BOOT
bool
default y if ARCH_X86
diff --git a/src/arch/x86/acpi_s3.c b/src/arch/x86/acpi_s3.c
index c327cbd..534ec67 100644
--- a/src/arch/x86/acpi_s3.c
+++ b/src/arch/x86/acpi_s3.c
@@ -19,8 +19,10 @@
#include <cbmem.h>
#include <cpu/cpu.h>
#include <timestamp.h>
+#include <program_loading.h>
#include <romstage_handoff.h>
#include <rules.h>
+#include <symbols.h>
#if ENV_RAMSTAGE
@@ -79,30 +81,121 @@ void acpi_fail_wakeup(void)
}
#endif /* ENV_RAMSTAGE */
+struct resume_backup {
+ uint64_t cbmem;
+ uint64_t lowmem;
+ uint64_t size;
+ uint8_t valid;
+};
+
+#define BACKUP_PAGE_SZ 4096
+
+static int backup_create_or_update(struct resume_backup *backup_mem,
+ uintptr_t base, size_t size)
+{
+ uintptr_t top;
+
+ if (IS_ENABLED(CONFIG_ACPI_HUGE_LOWMEM_BACKUP)) {
+ base = CONFIG_RAMBASE;
+ size = HIGH_MEMORY_SAVE;
+ }
+
+ /* Align backup region to complete pages. */
+ top = ALIGN_UP(base + size, BACKUP_PAGE_SZ);
+ base = ALIGN_DOWN(base, BACKUP_PAGE_SZ);
+ size = top - base;
+
+ /* Cannot extend existing region, should not happen. */
+ if (backup_mem && (backup_mem->size < size))
+ return -1;
+
+ /* Allocate backup with room for header. */
+ if (!backup_mem) {
+ size_t header_sz = ALIGN_UP(sizeof(*backup_mem), BACKUP_PAGE_SZ);
+ backup_mem = cbmem_add(CBMEM_ID_RESUME, header_sz + size);
+ if (!backup_mem)
+ return -1;
+
+ /* Container starts from boundary after header. */
+ backup_mem->cbmem = (uintptr_t)backup_mem + header_sz;
+ }
+
+ backup_mem->valid = 0;
+ backup_mem->lowmem = base;
+ backup_mem->size = size;
+ return 0;
+}
+
+void *acpi_backup_container(uintptr_t base, size_t size)
+{
+ struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME);
+ if (!backup_mem)
+ return NULL;
+
+ if (!IS_ALIGNED(base, BACKUP_PAGE_SZ) || !IS_ALIGNED(size, BACKUP_PAGE_SZ))
+ return NULL;
+
+ if (backup_create_or_update(backup_mem, base, size) < 0)
+ return NULL;
+
+ backup_mem->valid = 1;
+ return (void*)(uintptr_t)backup_mem->cbmem;
+}
+
+void backup_ramstage_section(uintptr_t base, size_t size)
+{
+ struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME);
+ if (!backup_mem)
+ return;
+
+ /* Check that the backup is not done twice. */
+ if (backup_mem->valid)
+ return;
+
+ /* When we are called from ramstage loader, update header with
+ * properties of the ramstage we will load.
+ */
+ if (backup_create_or_update(backup_mem, base, size) < 0)
+ return;
+
+ /* Back up the OS-controlled memory where ramstage will be loaded. */
+ memcpy((void*)(uintptr_t)backup_mem->cbmem,
+ (void*)(uintptr_t)backup_mem->lowmem, (size_t)backup_mem->size);
+ backup_mem->valid = 1;
+}
+
+/* Make backup of low-memory region, relying on the base and size
+ * of the ramstage that was loaded before entry to ACPI S3.
+ *
+ * DEPRECATED
+ */
void acpi_prepare_for_resume(void)
{
- if (!HIGH_MEMORY_SAVE)
+ struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME);
+ if (!backup_mem)
return;
/* Back up the OS-controlled memory where ramstage will be loaded. */
- void *src = (void *)CONFIG_RAMBASE;
- void *dest = cbmem_find(CBMEM_ID_RESUME);
- if (dest != NULL)
- memcpy(dest, src, HIGH_MEMORY_SAVE);
+ memcpy((void*)(uintptr_t)backup_mem->cbmem,
+ (void*)(uintptr_t)backup_mem->lowmem, (size_t)backup_mem->size);
+ backup_mem->valid = 1;
}
+/* Let's prepare the ACPI S3 Resume area now already, so we can rely on
+ * it being there during reboot time. If this fails, ACPI resume will
+ * be disabled. We assume that ramstage does not change while in suspend,
+ * so base and size of the currently running ramstage are used
+ * for allocation.
+ */
void acpi_prepare_resume_backup(void)
{
if (!acpi_s3_resume_allowed())
return;
- /* Let's prepare the ACPI S3 Resume area now already, so we can rely on
- * it being there during reboot time. We don't need the pointer, nor
- * the result right now. If it fails, ACPI resume will be disabled.
- */
+ if (IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE))
+ return;
- if (HIGH_MEMORY_SAVE)
- cbmem_add(CBMEM_ID_RESUME, HIGH_MEMORY_SAVE);
+ backup_create_or_update(NULL, (uintptr_t)_program, _program_size);
}
#define WAKEUP_BASE 0x600
@@ -115,17 +208,22 @@ extern unsigned int __wakeup_size;
static void acpi_jump_to_wakeup(void *vector)
{
- uintptr_t acpi_backup_memory = 0;
+ uintptr_t source = 0, target = 0;
+ size_t size = 0;
if (!acpi_s3_resume_allowed()) {
printk(BIOS_WARNING, "ACPI: S3 resume not allowed.\n");
return;
}
- if (HIGH_MEMORY_SAVE) {
- acpi_backup_memory = (uintptr_t)cbmem_find(CBMEM_ID_RESUME);
-
- if (!acpi_backup_memory) {
+ if (!IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)) {
+ struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME);
+ if (backup_mem && backup_mem->valid) {
+ backup_mem->valid = 0;
+ target = backup_mem->lowmem;
+ source = backup_mem->cbmem;
+ size = backup_mem->size;
+ } else {
printk(BIOS_WARNING, "ACPI: Backup memory missing. "
"No S3 resume.\n");
return;
@@ -137,8 +235,7 @@ static void acpi_jump_to_wakeup(void *vector)
timestamp_add_now(TS_ACPI_WAKE_JUMP);
- acpi_do_wakeup((uintptr_t)vector, acpi_backup_memory, CONFIG_RAMBASE,
- HIGH_MEMORY_SAVE);
+ acpi_do_wakeup((uintptr_t)vector, source, target, size);
}
void __attribute__((weak)) mainboard_suspend_resume(void)
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 7fc1c50..7c29648 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -25,12 +25,7 @@
#ifndef __ASM_ACPI_H
#define __ASM_ACPI_H
-#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
- ! IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)
#define HIGH_MEMORY_SAVE (CONFIG_RAMTOP - CONFIG_RAMBASE)
-#else
-#define HIGH_MEMORY_SAVE 0
-#endif
#if IS_ENABLED(CONFIG_ACPI_INTEL_HARDWARE_SLEEP_VALUES)
/*
@@ -688,6 +683,13 @@ static inline int acpi_s3_resume_allowed(void)
return IS_ENABLED(CONFIG_HAVE_ACPI_RESUME);
}
+/* Return address in reserved memory where to backup low memory
+ * while platform resumes from S3 suspend. Caller is responsible of
+ * making a complete copy of the region base..base+size, with
+ * parameteres base and size that meet page alignment requirement.
+ */
+void *acpi_backup_container(uintptr_t base, size_t size);
+
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
extern int acpi_slp_type;
diff --git a/src/cpu/amd/agesa/Kconfig b/src/cpu/amd/agesa/Kconfig
index ae5e854..7fe24ce 100644
--- a/src/cpu/amd/agesa/Kconfig
+++ b/src/cpu/amd/agesa/Kconfig
@@ -31,6 +31,7 @@ config CPU_AMD_AGESA
select UDELAY_LAPIC
select LAPIC_MONOTONIC_TIMER
select SPI_FLASH if HAVE_ACPI_RESUME
+ select ACPI_TINY_LOWMEM_BACKUP
if CPU_AMD_AGESA
diff --git a/src/cpu/amd/car/post_cache_as_ram.c b/src/cpu/amd/car/post_cache_as_ram.c
index 19aa0a2..296adc9 100644
--- a/src/cpu/amd/car/post_cache_as_ram.c
+++ b/src/cpu/amd/car/post_cache_as_ram.c
@@ -69,7 +69,7 @@ static void prepare_romstage_ramstack(int s3resume)
print_car_debug("Prepare CAR migration and stack regions...");
if (s3resume) {
- void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
+ void *resume_backup_memory = acpi_backup_container(CONFIG_RAMBASE, HIGH_MEMORY_SAVE);
if (resume_backup_memory)
memcpy_(resume_backup_memory + HIGH_MEMORY_SAVE - backup_top,
(void *)(CONFIG_RAMTOP - backup_top), backup_top);
@@ -85,7 +85,7 @@ static void prepare_ramstage_region(int s3resume)
print_car_debug("Prepare ramstage memory region...");
if (s3resume) {
- void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
+ void *resume_backup_memory = acpi_backup_container(CONFIG_RAMBASE, HIGH_MEMORY_SAVE);
if (resume_backup_memory)
memcpy_(resume_backup_memory, (void *) CONFIG_RAMBASE,
HIGH_MEMORY_SAVE - backup_top);
diff --git a/src/cpu/amd/pi/Kconfig b/src/cpu/amd/pi/Kconfig
index ed379ea..203fa03 100644
--- a/src/cpu/amd/pi/Kconfig
+++ b/src/cpu/amd/pi/Kconfig
@@ -28,6 +28,7 @@ config CPU_AMD_PI
select UDELAY_LAPIC
select LAPIC_MONOTONIC_TIMER
select SPI_FLASH if HAVE_ACPI_RESUME
+ select ACPI_TINY_LOWMEM_BACKUP
if CPU_AMD_PI
diff --git a/src/include/cbfs.h b/src/include/cbfs.h
index 6063dd6..8538b3d 100644
--- a/src/include/cbfs.h
+++ b/src/include/cbfs.h
@@ -47,6 +47,9 @@ size_t cbfs_boot_load_struct(const char *name, void *buf, size_t buf_size);
size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
size_t in_size, void *buffer, size_t buffer_size, uint32_t compression);
+/* Return the size and fill base of the memory pstage will occupy after loaded. */
+size_t cbfs_prog_stage_section(struct prog *pstage, uintptr_t *base);
+
/* Load stage into memory filling in prog. Return 0 on success. < 0 on error. */
int cbfs_prog_stage_load(struct prog *prog);
diff --git a/src/include/program_loading.h b/src/include/program_loading.h
index 08687f3..416e2e9 100644
--- a/src/include/program_loading.h
+++ b/src/include/program_loading.h
@@ -173,6 +173,10 @@ uintptr_t romstage_ram_stack_base(size_t size, int src);
uintptr_t romstage_ram_stack_top(void);
uintptr_t romstage_ram_stack_bottom(void);
+/* Backup OS memory to CBMEM_ID_RESUME on ACPI S3 resume path,
+ * if ramstage overwrites low memory. */
+void backup_ramstage_section(uintptr_t base, size_t size);
+
/***********************
* PAYLOAD LOADING *
***********************/
diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index 5a2f63f..19737a4 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -187,6 +187,18 @@ size_t cbfs_boot_load_struct(const char *name, void *buf, size_t buf_size)
buf, buf_size, compression_algo);
}
+size_t cbfs_prog_stage_section(struct prog *pstage, uintptr_t *base)
+{
+ struct cbfs_stage stage;
+ const struct region_device *fh = prog_rdev(pstage);
+
+ if (rdev_readat(fh, &stage, 0, sizeof(stage)) != sizeof(stage))
+ return 0;
+
+ *base = (uintptr_t)stage.load;
+ return stage.memlen;
+}
+
int cbfs_prog_stage_load(struct prog *pstage)
{
struct cbfs_stage stage;
diff --git a/src/lib/prog_loaders.c b/src/lib/prog_loaders.c
index 09933ae..3a6f2e2 100644
--- a/src/lib/prog_loaders.c
+++ b/src/lib/prog_loaders.c
@@ -110,6 +110,18 @@ static int load_relocatable_ramstage(struct prog *ramstage)
return rmodule_stage_load(&rmod_ram);
}
+static int load_nonrelocatable_ramstage(struct prog *ramstage)
+{
+ if (IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)) {
+ uintptr_t base = 0;
+ size_t size = cbfs_prog_stage_section(ramstage, &base);
+ if (size)
+ backup_ramstage_section(base, size);
+ }
+
+ return cbfs_prog_stage_load(ramstage);
+}
+
void run_ramstage(void)
{
struct prog ramstage =
@@ -135,7 +147,7 @@ void run_ramstage(void)
if (IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)) {
if (load_relocatable_ramstage(&ramstage))
goto fail;
- } else if (cbfs_prog_stage_load(&ramstage))
+ } else if (load_nonrelocatable_ramstage(&ramstage))
goto fail;
stage_cache_add(STAGE_RAMSTAGE, &ramstage);
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