CBMEM: Support DYNAMIC_CBMEM with LATE_CBMEM_INIT

We can now create CBMEM with dynamic allocation even if CBMEM
location is resolved late in ramstage.

Change-Id: I8529ccbcd4a0e567ebe0a46232ac5d16476e81a8
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7861
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)

src/Kconfig

@@ -162,7 +162,6 @@ config EARLY_CBMEM_INIT
 config DYNAMIC_CBMEM
 	bool
 	default n
-	select EARLY_CBMEM_INIT
 	help
 	  Instead of reserving a static amount of CBMEM space the CBMEM
 	  area grows dynamically.  CBMEM can be used both in romstage (after
@@ -201,7 +200,7 @@ config RELOCATABLE_MODULES
 	 loaded anywhere and all the relocations are handled automatically.
 
 config RELOCATABLE_RAMSTAGE
-	depends on (RELOCATABLE_MODULES && DYNAMIC_CBMEM)
+	depends on (RELOCATABLE_MODULES && DYNAMIC_CBMEM && EARLY_CBMEM_INIT)
 	bool "Build the ramstage to be relocatable in 32-bit address space."
 	default n
 	help

src/arch/x86/boot/cbmem.c

@@ -39,6 +39,9 @@ void get_cbmem_table(uint64_t *base, uint64_t *size)
 		*size = 0;
 	}
 }
+#endif /* !DYNAMIC_CBMEM */
+
+#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
 
 #if !defined(__PRE_RAM__)
 void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
@@ -46,14 +49,14 @@ void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
 	/* Do nothing. Chipset may have implementation to save ramtop in NVRAM. */
 }
 
-/* This is for compatibility with old boards only. Any new chipset and board
- * must implement get_top_of_ram() for both romstage and ramstage to support
- * early features like COLLECT_TIMESTAMPS and CBMEM_CONSOLE.
- */
 void set_top_of_ram(uint64_t ramtop)
 {
 	backup_top_of_ram(ramtop);
+#if !CONFIG_DYNAMIC_CBMEM
 	cbmem_late_set_table(ramtop - HIGH_MEMORY_SIZE, HIGH_MEMORY_SIZE);
+#else
+	cbmem_set_top((void*)(uintptr_t)ramtop);
+#endif
 }
 #endif /* !__PRE_RAM__ */
 
@@ -70,7 +73,8 @@ void *cbmem_top(void)
 	return (void *)get_top_of_ram();
 }
 #endif
-#endif /* !DYNAMIC_CBMEM */
+
+#endif /* LATE_CBMEM_INIT */
 
 void cbmem_run_init_hooks(void)
 {

src/include/cbmem.h

@@ -151,6 +151,9 @@ void cbmem_initialize_empty(void);
  * below 4GiB. */
 void *cbmem_top(void);
 
+/* Set the top address for dynamic cbmem. Not for new designs. */
+void cbmem_set_top(void *ramtop);
+
 /* Add a cbmem entry of a given size and id. These return NULL on failure. The
  * add function performs a find first and do not check against the original
  * size. */
@@ -168,7 +171,6 @@ int cbmem_entry_remove(const struct cbmem_entry *entry);
 void *cbmem_entry_start(const struct cbmem_entry *entry);
 u64 cbmem_entry_size(const struct cbmem_entry *entry);
 
-
 #else /* !CONFIG_DYNAMIC_CBMEM */
 
 /* Allocation with static CBMEM is resolved at build time. We start
@@ -183,15 +185,10 @@ u64 cbmem_entry_size(const struct cbmem_entry *entry);
 
 #define HIGH_MEMORY_SIZE	ALIGN_UP(_CBMEM_SZ_TOTAL, 0x10000)
 
-
 #ifndef __PRE_RAM__
-void set_top_of_ram(uint64_t ramtop);
-void backup_top_of_ram(uint64_t ramtop);
 void cbmem_late_set_table(uint64_t base, uint64_t size);
 #endif
 
-unsigned long get_top_of_ram(void);
-
 void get_cbmem_table(uint64_t *base, uint64_t *size);
 struct cbmem_entry *get_cbmem_toc(void);
 
@@ -224,6 +221,16 @@ void cbmem_list(void);
 void cbmem_print_entry(int n, u32 id, u64 start, u64 size);
 #endif /* __PRE_RAM__ */
 
+/* These are for compatibility with old boards only. Any new chipset and board
+ * must implement cbmem_top() for both romstage and ramstage to support
+ * early features like COLLECT_TIMESTAMPS and CBMEM_CONSOLE.
+ */
+#if IS_ENABLED(CONFIG_ARCH_X86) && IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
+unsigned long get_top_of_ram(void);
+void set_top_of_ram(uint64_t ramtop);
+void backup_top_of_ram(uint64_t ramtop);
+#endif
+
 #endif /* __ASSEMBLER__ */
 
 

src/lib/cbmem_console.c

@@ -58,7 +58,7 @@ extern struct cbmem_console preram_cbmem_console;
  * during the ROM stage, once CBMEM becomes available at RAM stage.
  */
 
-#if CONFIG_DYNAMIC_CBMEM
+#if IS_ENABLED(CONFIG_EARLY_CBMEM_INIT)
 #define STATIC_CONSOLE_SIZE 1024
 #else
 #define STATIC_CONSOLE_SIZE CONFIG_CONSOLE_CBMEM_BUFFER_SIZE

src/lib/dynamic_cbmem.c

@@ -24,10 +24,9 @@
 #include <string.h>
 #include <stdlib.h>
 #include <arch/early_variables.h>
-#if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__)
+#if IS_ENABLED(CONFIG_ARCH_X86) && !IS_ENABLED(CONFIG_EARLY_CBMEM_INIT)
 #include <arch/acpi.h>
 #endif
-
 #ifndef UINT_MAX
 #define UINT_MAX 4294967295U
 #endif
@@ -69,11 +68,18 @@ struct cbmem_root {
 } __attribute__((packed));
 
 
+#if !defined(__PRE_RAM__)
+static void *cached_cbmem_top;
+
+void cbmem_set_top(void * ramtop)
+{
+	cached_cbmem_top = ramtop;
+}
+#endif
+
 static inline void *cbmem_top_cached(void)
 {
 #if !defined(__PRE_RAM__)
-	static void *cached_cbmem_top;
-
 	if (cached_cbmem_top == NULL)
 		cached_cbmem_top = cbmem_top();
 
@@ -100,6 +106,9 @@ static inline void *get_root(void)
 	struct cbmem_root_pointer *pointer;
 
 	pointer_addr = get_top_aligned();
+	if (pointer_addr == 0)
+		return NULL;
+
 	pointer_addr -= sizeof(struct cbmem_root_pointer);
 
 	pointer = (void *)pointer_addr;
@@ -146,6 +155,9 @@ void cbmem_initialize_empty(void)
 	 * DYN_CBMEM_ALIGN_SIZE. The pointer falls just below the
 	 * address returned by get_top_aligned(). */
 	pointer_addr = get_top_aligned();
+	if (pointer_addr == 0)
+		return;
+
 	root_addr = pointer_addr - ROOT_MIN_SIZE;
 	root_addr &= ~(DYN_CBMEM_ALIGN_SIZE - 1);
 	pointer_addr -= sizeof(struct cbmem_root_pointer);
@@ -413,6 +425,8 @@ void *cbmem_entry_start(const struct cbmem_entry *entry)
 
 
 #if !defined(__PRE_RAM__)
+
+#if IS_ENABLED(CONFIG_EARLY_CBMEM_INIT)
 /* selected cbmem can be initialized early in ramstage. Additionally, that
  * means cbmem console can be reinitialized early as well. The post_device
  * function is empty since cbmem was initialized early in ramstage. */
@@ -426,6 +440,22 @@ BOOT_STATE_INIT_ENTRIES(cbmem_bscb) = {
 	                      init_cbmem_pre_device, NULL),
 };
 
+#else
+
+static void init_cbmem_post_device(void *unused)
+{
+	if (acpi_is_wakeup())
+		cbmem_initialize();
+	else
+		cbmem_initialize_empty();
+}
+
+BOOT_STATE_INIT_ENTRIES(cbmem_bscb) = {
+	BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_ENTRY,
+	                      init_cbmem_post_device, NULL),
+};
+#endif
+
 void cbmem_add_bootmem(void)
 {
 	uintptr_t base;