chromeos: provide option to dynamically allocate ram oops buffer

Fixing the location of the ram oops buffer can lead to certain
kernel and boot loaders being confused when there is a ram
reservation low in the address space. Alternatively provide
a mechanism to allocate the ram oops buffer in cbmem. As cbmem
is usually high in the address space it avoids low reservation
confusion.

The patch uncondtionally provides a GOOG9999 ACPI device with
a single memory resource describing the memory region used for
the ramoops region.

BUG=None
BRANCH=baytrail,haswell
TEST=Built and booted with and w/o dynamic ram oops. With
     the corresponding kernel change things behave correctly.

Change-Id: Ide2bb4434768c9f9b90e125adae4324cb1d2d073
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5257
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/cbmem.h

@@ -62,6 +62,7 @@
 #define CBMEM_ID_REFCODE	0x04efc0de
 #define CBMEM_ID_REFCODE_CACHE	0x4efc0de5
 #define CBMEM_ID_SMM_SAVE_SPACE	0x07e9acee
+#define CBMEM_ID_RAM_OOPS	0x05430095
 #define CBMEM_ID_NONE		0x00000000
 #define CBMEM_ID_AGESA_RUNTIME	0x41474553
 #define CBMEM_ID_HOB_POINTER		0x484f4221

src/lib/cbmem_info.c

@@ -52,6 +52,7 @@ static struct cbmem_id_to_name {
 	{ CBMEM_ID_REFCODE,		"REFCODE    " },
 	{ CBMEM_ID_SMM_SAVE_SPACE,	"SMM BACKUP " },
 	{ CBMEM_ID_REFCODE_CACHE,	"REFCODE $  " },
+	{ CBMEM_ID_RAM_OOPS,		"RAMOOPS    " },
 };
 
 void cbmem_print_entry(int n, u32 id, u64 base, u64 size)

src/vendorcode/google/chromeos/Kconfig

@@ -53,10 +53,15 @@ config CHROMEOS_RAMOOPS
 	bool "Reserve space for Chrome OS ramoops"
 	default y
 
+config CHROMEOS_RAMOOPS_DYNAMIC
+	bool "Allocate RAM oops buffer in cbmem"
+	default n
+	depends on CHROMEOS_RAMOOPS
+
 config CHROMEOS_RAMOOPS_RAM_START
 	hex "Physical address of preserved RAM"
 	default 0x00f00000
-	depends on CHROMEOS_RAMOOPS
+	depends on CHROMEOS_RAMOOPS && !CHROMEOS_RAMOOPS_DYNAMIC
 
 config CHROMEOS_RAMOOPS_RAM_SIZE
 	hex "Size of preserved RAM"

src/vendorcode/google/chromeos/Makefile.inc

@@ -25,6 +25,7 @@ romstage-$(CONFIG_ARCH_X86) += vboot.c
 ramstage-y += gnvs.c
 romstage-y += fmap.c
 ramstage-y += fmap.c
+ramstage-$(CONFIG_CHROMEOS_RAMOOPS) += ramoops.c
 smm-y += fmap.c
 ifneq ($(wildcard src/mainboard/$(MAINBOARDDIR)/chromeos.c),)
 ramstage-srcs += src/mainboard/$(MAINBOARDDIR)/chromeos.c

src/vendorcode/google/chromeos/acpi/chromeos.asl

@@ -107,3 +107,5 @@ Device (CRHW)
 		Return (TSLM)
 	}
 }
+
+#include "ramoops.asl"

src/vendorcode/google/chromeos/acpi/gnvs.asl

@@ -34,4 +34,6 @@ VBT9,   32,	// 0x196 - FMAP base address
 CHVD, 24576,	// 0x19a - VDAT space filled by verified boot
 VBTA,	32,	// 0xd9a - pointer to smbios FWID
 MEHH,  256,	// 0xd9e - Management Engine Hash
-		// 0xdbe
+RMOB,   32,	// 0xdbe - RAM oops base address
+RMOL,   32,	// 0xdc2 - RAM oops length
+		// 0xdc6

src/vendorcode/google/chromeos/acpi/ramoops.asl

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+Scope (\_SB)
+{
+	Device(RMOP)
+	{
+		Name (_HID, "GOOG9999")
+		Name (_CID, "GOOG9999")
+		Name (_UID, 1)
+
+		Name (RBUF, ResourceTemplate()
+		{
+			Memory32Fixed (ReadWrite, 0, 0, MRES)
+		})
+
+		Method (_CRS)
+		{
+			CreateDwordField (^RBUF, ^MRES._BAS, RBAS)
+			CreateDwordField (^RBUF, ^MRES._LEN, RLEN)
+			Store (\RMOB, RBAS)
+			Store (\RMOL, RLEN)
+			Return (^RBUF)
+		}
+	}
+}

src/vendorcode/google/chromeos/chromeos.h

@@ -51,4 +51,19 @@ void init_chromeos(int bootmode);
 int vboot_get_handoff_info(void **addr, uint32_t *size);
 #endif
 
+#if CONFIG_CHROMEOS_RAMOOPS
+#include "gnvs.h"
+struct device;
+
+void chromeos_ram_oops_init(chromeos_acpi_t *chromeos);
+#if CONFIG_CHROMEOS_RAMOOPS_DYNAMIC
+static inline void chromeos_reserve_ram_oops(struct device *dev, int idx) {}
+#else /* CONFIG_CHROMEOS_RAMOOPS_DYNAMIC */
+void chromeos_reserve_ram_oops(struct device *dev, int idx);
+#endif /* CONFIG_CHROMEOS_RAMOOPS_DYNAMIC */
+#else  /* !CONFIG_CHROMEOS_RAMOOPS */
+static inline void chromeos_ram_oops_init(chromeos_acpi_t *chromeos) {}
+static inline void chromeos_reserve_ram_oops(struct device *dev, int idx) {}
+#endif /* CONFIG_CHROMEOS_RAMOOPS */
+
 #endif

src/vendorcode/google/chromeos/gnvs.c

@@ -72,6 +72,8 @@ void chromeos_init_vboot(chromeos_acpi_t *chromeos)
 			    reason ? reason : ELOG_CROS_RECOVERY_MODE_BUTTON);
 	}
 #endif
+
+	chromeos_ram_oops_init(chromeos);
 }
 
 void chromeos_set_me_hash(u32 *hash, int len)

src/vendorcode/google/chromeos/gnvs.h

@@ -58,7 +58,9 @@ typedef struct {
 	u8	vdat[3072];	// 19a
 	u32	vbt10;		// d9a smbios bios version
 	u32	mehh[8];	// d9e management engine hash
-				// dbe
+	u32	ramoops_base;	// dbe ramoops base address
+	u32	ramoops_len;	// dc2 ramoops length
+	u8	pad[314];	// dc6-eff
 } __attribute__((packed)) chromeos_acpi_t;
 
 extern chromeos_acpi_t *vboot_data;

src/vendorcode/google/chromeos/ramoops.c

@@ -0,0 +1,99 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#include <stddef.h>
+#include <stdint.h>
+#include <bootstate.h>
+#include <console/console.h>
+#include <cbmem.h>
+#include <device/device.h>
+#include "chromeos.h"
+
+static void set_ramoops(chromeos_acpi_t *chromeos, void *ram_oops, size_t size)
+{
+	if (chromeos == NULL) {
+		printk(BIOS_DEBUG, "chromeos gnvs is NULL. ramoops not set.\n");
+		return;
+	}
+
+	printk(BIOS_DEBUG, "Ramoops buffer: 0x%zx@0x%p.\n", size, ram_oops);
+	chromeos->ramoops_base = (uintptr_t)ram_oops;
+	chromeos->ramoops_len = size;
+}
+
+static void reserve_ram_oops_dynamic(chromeos_acpi_t *chromeos)
+{
+	const size_t size = CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE;
+	void *ram_oops;
+
+	if (!IS_ENABLED(CONFIG_CHROMEOS_RAMOOPS_DYNAMIC))
+		return;
+
+	ram_oops = cbmem_add(CBMEM_ID_RAM_OOPS, size);
+
+	set_ramoops(chromeos, ram_oops, size);
+}
+
+#if CONFIG_CHROMEOS_RAMOOPS_DYNAMIC
+static inline void set_global_chromeos_pointer(chromeos_acpi_t *chromeos) {}
+#else /* !CONFIG_CHROMEOS_RAMOOPS_DYNAMIC */
+
+static const unsigned long ramoops_base = CONFIG_CHROMEOS_RAMOOPS_RAM_START;
+static const unsigned long ramoops_size = CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE;
+
+/*
+ * Save pointer to chromeos structure in memory. This is needed because the
+ * memory reservation is not done when chromeos_init() is called. However,
+ * the pointer to the chromeos_acpi_t structure is needed to update the
+ * fields with the rserved base and size.
+ */
+static chromeos_acpi_t *g_chromeos;
+
+static void set_global_chromeos_pointer(chromeos_acpi_t *chromeos)
+{
+	g_chromeos = chromeos;
+}
+
+static void update_gnvs(void *arg)
+{
+	chromeos_acpi_t **chromeos = arg;
+
+	set_ramoops(*chromeos, (void *)ramoops_base, ramoops_size);
+}
+
+static BOOT_STATE_CALLBACK(bscb_ramoops, update_gnvs, &g_chromeos);
+
+void chromeos_reserve_ram_oops(struct device *dev, int idx)
+{
+	const unsigned long base = ramoops_base >> 10;
+	const unsigned long size = ramoops_size >> 10;
+
+	reserved_ram_resource(dev, idx, base, size);
+
+	boot_state_sched_on_exit(&bscb_ramoops, BS_WRITE_TABLES);
+}
+#endif /* CONFIG_CHROMEOS_RAMOOPS_DYNAMIC */
+
+void chromeos_ram_oops_init(chromeos_acpi_t *chromeos)
+{
+	set_global_chromeos_pointer(chromeos);
+	reserve_ram_oops_dynamic(chromeos);
+}
+