linux-kernel - [PATCHv2 2/3] platform/chrome: pstore: probe for ramoops buffer using acpi

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Date:	Tue, 16 Feb 2016 08:25:15 +0100
From:	Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:	linux-kernel@...r.kernel.org, Olof Johansson <olof@...om.net>
Cc:	Gene Chen <gene.chen@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Aaron Durbin <adurbin@...omium.org>,
	Filipe Brandenburger <filbranden@...omium.org>,
	Ben Zhang <benzh@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: [PATCHv2 2/3] platform/chrome: pstore: probe for ramoops buffer using acpi

From: Aaron Durbin <adurbin@...omium.org>

In order to handle the firmware placing the ramoops buffer
in a different location than the kernel is configured to look
probe for an ACPI device specified by GOOG9999 acpi id. If
no device is found or the first memory resource is not defined
properly fall back to the configured base and length.

Signed-off-by: Aaron Durbin <adurbin@...omium.org>
Signed-off-by: Ben Zhang <benzh@...omium.org>
Signed-off-by: Filipe Brandenburger <filbranden@...omium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Reviewed-by: Olof Johansson <olofj@...omium.org>
---
 drivers/platform/chrome/chromeos_pstore.c | 53 ++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c
index 3474920..ca00192 100644
--- a/drivers/platform/chrome/chromeos_pstore.c
+++ b/drivers/platform/chrome/chromeos_pstore.c
@@ -8,6 +8,7 @@
  *  the Free Software Foundation, version 2 of the License.
  */
 
+#include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -71,9 +72,59 @@ static struct platform_device chromeos_ramoops = {
 	},
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cros_ramoops_acpi_match[] = {
+	{ "GOOG9999", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
+
+static struct platform_driver chromeos_ramoops_acpi = {
+	.driver		= {
+		.name	= "chromeos_pstore",
+		.acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
+	},
+};
+
+static int __init chromeos_probe_acpi(struct platform_device *pdev)
+{
+	struct resource *res;
+	resource_size_t len;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOMEM;
+
+	len = resource_size(res);
+	if (!res->start || !len)
+		return -ENOMEM;
+
+	pr_info("chromeos ramoops using acpi device.\n");
+
+	chromeos_ramoops_data.mem_size = len;
+	chromeos_ramoops_data.mem_address = res->start;
+
+	return 0;
+}
+
+static bool __init chromeos_check_acpi(void)
+{
+	if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
+		return true;
+	return false;
+}
+#else
+static inline bool chromeos_check_acpi(void) { return false; }
+#endif
+
 static int __init chromeos_pstore_init(void)
 {
-	if (dmi_check_system(chromeos_pstore_dmi_table))
+	bool acpi_dev_found;
+
+	/* First check ACPI for non-hardcoded values from firmware. */
+	acpi_dev_found = chromeos_check_acpi();
+
+	if (acpi_dev_found || dmi_check_system(chromeos_pstore_dmi_table))
 		return platform_device_register(&chromeos_ramoops);
 
 	return -ENODEV;
-- 
2.1.0