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Diffstat (limited to 'drivers/platform/x86/intel/pmt/crashlog.c')
-rw-r--r--drivers/platform/x86/intel/pmt/crashlog.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/pmt/crashlog.c b/drivers/platform/x86/intel/pmt/crashlog.c
new file mode 100644
index 000000000..ace1239bc
--- /dev/null
+++ b/drivers/platform/x86/intel/pmt/crashlog.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Platform Monitoring Technology Crashlog driver
+ *
+ * Copyright (c) 2020, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * Author: "Alexander Duyck" <alexander.h.duyck@linux.intel.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/overflow.h>
+
+#include "../vsec.h"
+#include "class.h"
+
+/* Crashlog discovery header types */
+#define CRASH_TYPE_OOBMSM 1
+
+/* Control Flags */
+#define CRASHLOG_FLAG_DISABLE BIT(28)
+
+/*
+ * Bits 29 and 30 control the state of bit 31.
+ *
+ * Bit 29 will clear bit 31, if set, allowing a new crashlog to be captured.
+ * Bit 30 will immediately trigger a crashlog to be generated, setting bit 31.
+ * Bit 31 is the read-only status with a 1 indicating log is complete.
+ */
+#define CRASHLOG_FLAG_TRIGGER_CLEAR BIT(29)
+#define CRASHLOG_FLAG_TRIGGER_EXECUTE BIT(30)
+#define CRASHLOG_FLAG_TRIGGER_COMPLETE BIT(31)
+#define CRASHLOG_FLAG_TRIGGER_MASK GENMASK(31, 28)
+
+/* Crashlog Discovery Header */
+#define CONTROL_OFFSET 0x0
+#define GUID_OFFSET 0x4
+#define BASE_OFFSET 0x8
+#define SIZE_OFFSET 0xC
+#define GET_ACCESS(v) ((v) & GENMASK(3, 0))
+#define GET_TYPE(v) (((v) & GENMASK(7, 4)) >> 4)
+#define GET_VERSION(v) (((v) & GENMASK(19, 16)) >> 16)
+/* size is in bytes */
+#define GET_SIZE(v) ((v) * sizeof(u32))
+
+struct crashlog_entry {
+ /* entry must be first member of struct */
+ struct intel_pmt_entry entry;
+ struct mutex control_mutex;
+};
+
+struct pmt_crashlog_priv {
+ int num_entries;
+ struct crashlog_entry entry[];
+};
+
+/*
+ * I/O
+ */
+static bool pmt_crashlog_complete(struct intel_pmt_entry *entry)
+{
+ u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+
+ /* return current value of the crashlog complete flag */
+ return !!(control & CRASHLOG_FLAG_TRIGGER_COMPLETE);
+}
+
+static bool pmt_crashlog_disabled(struct intel_pmt_entry *entry)
+{
+ u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+
+ /* return current value of the crashlog disabled flag */
+ return !!(control & CRASHLOG_FLAG_DISABLE);
+}
+
+static bool pmt_crashlog_supported(struct intel_pmt_entry *entry)
+{
+ u32 discovery_header = readl(entry->disc_table + CONTROL_OFFSET);
+ u32 crash_type, version;
+
+ crash_type = GET_TYPE(discovery_header);
+ version = GET_VERSION(discovery_header);
+
+ /*
+ * Currently we only recognize OOBMSM version 0 devices.
+ * We can ignore all other crashlog devices in the system.
+ */
+ return crash_type == CRASH_TYPE_OOBMSM && version == 0;
+}
+
+static void pmt_crashlog_set_disable(struct intel_pmt_entry *entry,
+ bool disable)
+{
+ u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+
+ /* clear trigger bits so we are only modifying disable flag */
+ control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
+
+ if (disable)
+ control |= CRASHLOG_FLAG_DISABLE;
+ else
+ control &= ~CRASHLOG_FLAG_DISABLE;
+
+ writel(control, entry->disc_table + CONTROL_OFFSET);
+}
+
+static void pmt_crashlog_set_clear(struct intel_pmt_entry *entry)
+{
+ u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+
+ control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
+ control |= CRASHLOG_FLAG_TRIGGER_CLEAR;
+
+ writel(control, entry->disc_table + CONTROL_OFFSET);
+}
+
+static void pmt_crashlog_set_execute(struct intel_pmt_entry *entry)
+{
+ u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+
+ control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
+ control |= CRASHLOG_FLAG_TRIGGER_EXECUTE;
+
+ writel(control, entry->disc_table + CONTROL_OFFSET);
+}
+
+/*
+ * sysfs
+ */
+static ssize_t
+enable_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct intel_pmt_entry *entry = dev_get_drvdata(dev);
+ int enabled = !pmt_crashlog_disabled(entry);
+
+ return sprintf(buf, "%d\n", enabled);
+}
+
+static ssize_t
+enable_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct crashlog_entry *entry;
+ bool enabled;
+ int result;
+
+ entry = dev_get_drvdata(dev);
+
+ result = kstrtobool(buf, &enabled);
+ if (result)
+ return result;
+
+ mutex_lock(&entry->control_mutex);
+ pmt_crashlog_set_disable(&entry->entry, !enabled);
+ mutex_unlock(&entry->control_mutex);
+
+ return count;
+}
+static DEVICE_ATTR_RW(enable);
+
+static ssize_t
+trigger_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct intel_pmt_entry *entry;
+ int trigger;
+
+ entry = dev_get_drvdata(dev);
+ trigger = pmt_crashlog_complete(entry);
+
+ return sprintf(buf, "%d\n", trigger);
+}
+
+static ssize_t
+trigger_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct crashlog_entry *entry;
+ bool trigger;
+ int result;
+
+ entry = dev_get_drvdata(dev);
+
+ result = kstrtobool(buf, &trigger);
+ if (result)
+ return result;
+
+ mutex_lock(&entry->control_mutex);
+
+ if (!trigger) {
+ pmt_crashlog_set_clear(&entry->entry);
+ } else if (pmt_crashlog_complete(&entry->entry)) {
+ /* we cannot trigger a new crash if one is still pending */
+ result = -EEXIST;
+ goto err;
+ } else if (pmt_crashlog_disabled(&entry->entry)) {
+ /* if device is currently disabled, return busy */
+ result = -EBUSY;
+ goto err;
+ } else {
+ pmt_crashlog_set_execute(&entry->entry);
+ }
+
+ result = count;
+err:
+ mutex_unlock(&entry->control_mutex);
+ return result;
+}
+static DEVICE_ATTR_RW(trigger);
+
+static struct attribute *pmt_crashlog_attrs[] = {
+ &dev_attr_enable.attr,
+ &dev_attr_trigger.attr,
+ NULL
+};
+
+static const struct attribute_group pmt_crashlog_group = {
+ .attrs = pmt_crashlog_attrs,
+};
+
+static int pmt_crashlog_header_decode(struct intel_pmt_entry *entry,
+ struct intel_pmt_header *header,
+ struct device *dev)
+{
+ void __iomem *disc_table = entry->disc_table;
+ struct crashlog_entry *crashlog;
+
+ if (!pmt_crashlog_supported(entry))
+ return 1;
+
+ /* initialize control mutex */
+ crashlog = container_of(entry, struct crashlog_entry, entry);
+ mutex_init(&crashlog->control_mutex);
+
+ header->access_type = GET_ACCESS(readl(disc_table));
+ header->guid = readl(disc_table + GUID_OFFSET);
+ header->base_offset = readl(disc_table + BASE_OFFSET);
+
+ /* Size is measured in DWORDS, but accessor returns bytes */
+ header->size = GET_SIZE(readl(disc_table + SIZE_OFFSET));
+
+ return 0;
+}
+
+static DEFINE_XARRAY_ALLOC(crashlog_array);
+static struct intel_pmt_namespace pmt_crashlog_ns = {
+ .name = "crashlog",
+ .xa = &crashlog_array,
+ .attr_grp = &pmt_crashlog_group,
+ .pmt_header_decode = pmt_crashlog_header_decode,
+};
+
+/*
+ * initialization
+ */
+static void pmt_crashlog_remove(struct auxiliary_device *auxdev)
+{
+ struct pmt_crashlog_priv *priv = auxiliary_get_drvdata(auxdev);
+ int i;
+
+ for (i = 0; i < priv->num_entries; i++)
+ intel_pmt_dev_destroy(&priv->entry[i].entry, &pmt_crashlog_ns);
+}
+
+static int pmt_crashlog_probe(struct auxiliary_device *auxdev,
+ const struct auxiliary_device_id *id)
+{
+ struct intel_vsec_device *intel_vsec_dev = auxdev_to_ivdev(auxdev);
+ struct pmt_crashlog_priv *priv;
+ size_t size;
+ int i, ret;
+
+ size = struct_size(priv, entry, intel_vsec_dev->num_resources);
+ priv = devm_kzalloc(&auxdev->dev, size, GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ auxiliary_set_drvdata(auxdev, priv);
+
+ for (i = 0; i < intel_vsec_dev->num_resources; i++) {
+ struct intel_pmt_entry *entry = &priv->entry[priv->num_entries].entry;
+
+ ret = intel_pmt_dev_create(entry, &pmt_crashlog_ns, intel_vsec_dev, i);
+ if (ret < 0)
+ goto abort_probe;
+ if (ret)
+ continue;
+
+ priv->num_entries++;
+ }
+
+ return 0;
+abort_probe:
+ pmt_crashlog_remove(auxdev);
+ return ret;
+}
+
+static const struct auxiliary_device_id pmt_crashlog_id_table[] = {
+ { .name = "intel_vsec.crashlog" },
+ {}
+};
+MODULE_DEVICE_TABLE(auxiliary, pmt_crashlog_id_table);
+
+static struct auxiliary_driver pmt_crashlog_aux_driver = {
+ .id_table = pmt_crashlog_id_table,
+ .remove = pmt_crashlog_remove,
+ .probe = pmt_crashlog_probe,
+};
+
+static int __init pmt_crashlog_init(void)
+{
+ return auxiliary_driver_register(&pmt_crashlog_aux_driver);
+}
+
+static void __exit pmt_crashlog_exit(void)
+{
+ auxiliary_driver_unregister(&pmt_crashlog_aux_driver);
+ xa_destroy(&crashlog_array);
+}
+
+module_init(pmt_crashlog_init);
+module_exit(pmt_crashlog_exit);
+
+MODULE_AUTHOR("Alexander Duyck <alexander.h.duyck@linux.intel.com>");
+MODULE_DESCRIPTION("Intel PMT Crashlog driver");
+MODULE_LICENSE("GPL v2");