Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

1 files changed, 609 insertions, 0 deletions

diff --git a/drivers/misc/smpro-errmon.c b/drivers/misc/smpro-errmon.c
new file mode 100644
index 000000000..56952fd96
--- /dev/null
+++ b/drivers/misc/smpro-errmon.c
@@ -0,0 +1,609 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ampere Computing SoC's SMpro Error Monitoring Driver
+ *
+ * Copyright (c) 2022, Ampere Computing LLC
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* GPI RAS Error Registers */
+#define GPI_RAS_ERR		0x7E
+
+/* Core and L2C Error Registers */
+#define CORE_CE_ERR_CNT		0x80
+#define CORE_CE_ERR_LEN		0x81
+#define CORE_CE_ERR_DATA	0x82
+#define CORE_UE_ERR_CNT		0x83
+#define CORE_UE_ERR_LEN		0x84
+#define CORE_UE_ERR_DATA	0x85
+
+/* Memory Error Registers */
+#define MEM_CE_ERR_CNT		0x90
+#define MEM_CE_ERR_LEN		0x91
+#define MEM_CE_ERR_DATA		0x92
+#define MEM_UE_ERR_CNT		0x93
+#define MEM_UE_ERR_LEN		0x94
+#define MEM_UE_ERR_DATA		0x95
+
+/* RAS Error/Warning Registers */
+#define ERR_SMPRO_TYPE		0xA0
+#define ERR_PMPRO_TYPE		0xA1
+#define ERR_SMPRO_INFO_LO	0xA2
+#define ERR_SMPRO_INFO_HI	0xA3
+#define ERR_SMPRO_DATA_LO	0xA4
+#define ERR_SMPRO_DATA_HI	0xA5
+#define WARN_SMPRO_INFO_LO	0xAA
+#define WARN_SMPRO_INFO_HI	0xAB
+#define ERR_PMPRO_INFO_LO	0xA6
+#define ERR_PMPRO_INFO_HI	0xA7
+#define ERR_PMPRO_DATA_LO	0xA8
+#define ERR_PMPRO_DATA_HI	0xA9
+#define WARN_PMPRO_INFO_LO	0xAC
+#define WARN_PMPRO_INFO_HI	0xAD
+
+/* Boot Stage Register */
+#define BOOTSTAGE		0xB0
+#define DIMM_SYNDROME_SEL	0xB4
+#define DIMM_SYNDROME_ERR	0xB5
+#define DIMM_SYNDROME_STAGE	4
+
+/* PCIE Error Registers */
+#define PCIE_CE_ERR_CNT		0xC0
+#define PCIE_CE_ERR_LEN		0xC1
+#define PCIE_CE_ERR_DATA	0xC2
+#define PCIE_UE_ERR_CNT		0xC3
+#define PCIE_UE_ERR_LEN		0xC4
+#define PCIE_UE_ERR_DATA	0xC5
+
+/* Other Error Registers */
+#define OTHER_CE_ERR_CNT	0xD0
+#define OTHER_CE_ERR_LEN	0xD1
+#define OTHER_CE_ERR_DATA	0xD2
+#define OTHER_UE_ERR_CNT	0xD8
+#define OTHER_UE_ERR_LEN	0xD9
+#define OTHER_UE_ERR_DATA	0xDA
+
+/* Event Data Registers */
+#define VRD_WARN_FAULT_EVENT_DATA	0x78
+#define VRD_HOT_EVENT_DATA		0x79
+#define DIMM_HOT_EVENT_DATA		0x7A
+#define DIMM_2X_REFRESH_EVENT_DATA	0x96
+
+#define MAX_READ_BLOCK_LENGTH	48
+
+#define RAS_SMPRO_ERR		0
+#define RAS_PMPRO_ERR		1
+
+enum RAS_48BYTES_ERR_TYPES {
+	CORE_CE_ERR,
+	CORE_UE_ERR,
+	MEM_CE_ERR,
+	MEM_UE_ERR,
+	PCIE_CE_ERR,
+	PCIE_UE_ERR,
+	OTHER_CE_ERR,
+	OTHER_UE_ERR,
+	NUM_48BYTES_ERR_TYPE,
+};
+
+struct smpro_error_hdr {
+	u8 count;	/* Number of the RAS errors */
+	u8 len;		/* Number of data bytes */
+	u8 data;	/* Start of 48-byte data */
+	u8 max_cnt;	/* Max num of errors */
+};
+
+/*
+ * Included Address of registers to get Count, Length of data and Data
+ * of the 48 bytes error data
+ */
+static struct smpro_error_hdr smpro_error_table[] = {
+	[CORE_CE_ERR] = {
+		.count = CORE_CE_ERR_CNT,
+		.len = CORE_CE_ERR_LEN,
+		.data = CORE_CE_ERR_DATA,
+		.max_cnt = 32
+	},
+	[CORE_UE_ERR] = {
+		.count = CORE_UE_ERR_CNT,
+		.len = CORE_UE_ERR_LEN,
+		.data = CORE_UE_ERR_DATA,
+		.max_cnt = 32
+	},
+	[MEM_CE_ERR] = {
+		.count = MEM_CE_ERR_CNT,
+		.len = MEM_CE_ERR_LEN,
+		.data = MEM_CE_ERR_DATA,
+		.max_cnt = 16
+	},
+	[MEM_UE_ERR] = {
+		.count = MEM_UE_ERR_CNT,
+		.len = MEM_UE_ERR_LEN,
+		.data = MEM_UE_ERR_DATA,
+		.max_cnt = 16
+	},
+	[PCIE_CE_ERR] = {
+		.count = PCIE_CE_ERR_CNT,
+		.len = PCIE_CE_ERR_LEN,
+		.data = PCIE_CE_ERR_DATA,
+		.max_cnt = 96
+	},
+	[PCIE_UE_ERR] = {
+		.count = PCIE_UE_ERR_CNT,
+		.len = PCIE_UE_ERR_LEN,
+		.data = PCIE_UE_ERR_DATA,
+		.max_cnt = 96
+	},
+	[OTHER_CE_ERR] = {
+		.count = OTHER_CE_ERR_CNT,
+		.len = OTHER_CE_ERR_LEN,
+		.data = OTHER_CE_ERR_DATA,
+		.max_cnt = 8
+	},
+	[OTHER_UE_ERR] = {
+		.count = OTHER_UE_ERR_CNT,
+		.len = OTHER_UE_ERR_LEN,
+		.data = OTHER_UE_ERR_DATA,
+		.max_cnt = 8
+	},
+};
+
+/*
+ * List of SCP registers which are used to get
+ * one type of RAS Internal errors.
+ */
+struct smpro_int_error_hdr {
+	u8 type;
+	u8 info_l;
+	u8 info_h;
+	u8 data_l;
+	u8 data_h;
+	u8 warn_l;
+	u8 warn_h;
+};
+
+static struct smpro_int_error_hdr list_smpro_int_error_hdr[] = {
+	[RAS_SMPRO_ERR] = {
+		.type = ERR_SMPRO_TYPE,
+		.info_l = ERR_SMPRO_INFO_LO,
+		.info_h = ERR_SMPRO_INFO_HI,
+		.data_l = ERR_SMPRO_DATA_LO,
+		.data_h = ERR_SMPRO_DATA_HI,
+		.warn_l = WARN_SMPRO_INFO_LO,
+		.warn_h = WARN_SMPRO_INFO_HI,
+	},
+	[RAS_PMPRO_ERR] = {
+		.type = ERR_PMPRO_TYPE,
+		.info_l = ERR_PMPRO_INFO_LO,
+		.info_h = ERR_PMPRO_INFO_HI,
+		.data_l = ERR_PMPRO_DATA_LO,
+		.data_h = ERR_PMPRO_DATA_HI,
+		.warn_l = WARN_PMPRO_INFO_LO,
+		.warn_h = WARN_PMPRO_INFO_HI,
+	},
+};
+
+struct smpro_errmon {
+	struct regmap *regmap;
+};
+
+enum EVENT_TYPES {
+	VRD_WARN_FAULT_EVENT,
+	VRD_HOT_EVENT,
+	DIMM_HOT_EVENT,
+	DIMM_2X_REFRESH_EVENT,
+	NUM_EVENTS_TYPE,
+};
+
+/* Included Address of event source and data registers */
+static u8 smpro_event_table[NUM_EVENTS_TYPE] = {
+	VRD_WARN_FAULT_EVENT_DATA,
+	VRD_HOT_EVENT_DATA,
+	DIMM_HOT_EVENT_DATA,
+	DIMM_2X_REFRESH_EVENT_DATA,
+};
+
+static ssize_t smpro_event_data_read(struct device *dev,
+				     struct device_attribute *da, char *buf,
+				     int channel)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	s32 event_data;
+	int ret;
+
+	ret = regmap_read(errmon->regmap, smpro_event_table[channel], &event_data);
+	if (ret)
+		return ret;
+	/* Clear event after read */
+	if (event_data != 0)
+		regmap_write(errmon->regmap, smpro_event_table[channel], event_data);
+
+	return sysfs_emit(buf, "%04x\n", event_data);
+}
+
+static ssize_t smpro_overflow_data_read(struct device *dev, struct device_attribute *da,
+					char *buf, int channel)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	struct smpro_error_hdr *err_info;
+	s32 err_count;
+	int ret;
+
+	err_info = &smpro_error_table[channel];
+
+	ret = regmap_read(errmon->regmap, err_info->count, &err_count);
+	if (ret)
+		return ret;
+
+	/* Bit 8 indicates the overflow status */
+	return sysfs_emit(buf, "%d\n", (err_count & BIT(8)) ? 1 : 0);
+}
+
+static ssize_t smpro_error_data_read(struct device *dev, struct device_attribute *da,
+				     char *buf, int channel)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	unsigned char err_data[MAX_READ_BLOCK_LENGTH];
+	struct smpro_error_hdr *err_info;
+	s32 err_count, err_length;
+	int ret;
+
+	err_info = &smpro_error_table[channel];
+
+	ret = regmap_read(errmon->regmap, err_info->count, &err_count);
+	/* Error count is the low byte */
+	err_count &= 0xff;
+	if (ret || !err_count || err_count > err_info->max_cnt)
+		return ret;
+
+	ret = regmap_read(errmon->regmap, err_info->len, &err_length);
+	if (ret || err_length <= 0)
+		return ret;
+
+	if (err_length > MAX_READ_BLOCK_LENGTH)
+		err_length = MAX_READ_BLOCK_LENGTH;
+
+	memset(err_data, 0x00, MAX_READ_BLOCK_LENGTH);
+	ret = regmap_noinc_read(errmon->regmap, err_info->data, err_data, err_length);
+	if (ret < 0)
+		return ret;
+
+	/* clear the error */
+	ret = regmap_write(errmon->regmap, err_info->count, 0x100);
+	if (ret)
+		return ret;
+	/*
+	 * The output of Core/Memory/PCIe/Others UE/CE errors follows the format
+	 * specified in section 5.8.1 CE/UE Error Data record in
+	 * Altra SOC BMC Interface specification.
+	 */
+	return sysfs_emit(buf, "%*phN\n", MAX_READ_BLOCK_LENGTH, err_data);
+}
+
+/*
+ * Output format:
+ * <4-byte hex value of error info><4-byte hex value of error extensive data>
+ * Where:
+ *   + error info : The error information
+ *   + error data : Extensive data (32 bits)
+ * Reference to section 5.10 RAS Internal Error Register Definition in
+ * Altra SOC BMC Interface specification
+ */
+static ssize_t smpro_internal_err_read(struct device *dev, struct device_attribute *da,
+				       char *buf, int channel)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	struct smpro_int_error_hdr *err_info;
+	unsigned int err[4] = { 0 };
+	unsigned int err_type;
+	unsigned int val;
+	int ret;
+
+	/* read error status */
+	ret = regmap_read(errmon->regmap, GPI_RAS_ERR, &val);
+	if (ret)
+		return ret;
+
+	if ((channel == RAS_SMPRO_ERR && !(val & BIT(0))) ||
+	    (channel == RAS_PMPRO_ERR && !(val & BIT(1))))
+		return 0;
+
+	err_info = &list_smpro_int_error_hdr[channel];
+	ret = regmap_read(errmon->regmap, err_info->type, &val);
+	if (ret)
+		return ret;
+
+	err_type = (val & BIT(1)) ? BIT(1) :
+		   (val & BIT(2)) ? BIT(2) : 0;
+
+	if (!err_type)
+		return 0;
+
+	ret = regmap_read(errmon->regmap, err_info->info_l, err + 1);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(errmon->regmap, err_info->info_h, err);
+	if (ret)
+		return ret;
+
+	if (err_type & BIT(2)) {
+		/* Error with data type */
+		ret = regmap_read(errmon->regmap, err_info->data_l, err + 3);
+		if (ret)
+			return ret;
+
+		ret = regmap_read(errmon->regmap, err_info->data_h, err + 2);
+		if (ret)
+			return ret;
+	}
+
+	/* clear the read errors */
+	ret = regmap_write(errmon->regmap, err_info->type, err_type);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%*phN\n", (int)sizeof(err), err);
+}
+
+/*
+ * Output format:
+ * <4-byte hex value of warining info>
+ * Reference to section 5.10 RAS Internal Error Register Definition in
+ * Altra SOC BMC Interface specification
+ */
+static ssize_t smpro_internal_warn_read(struct device *dev, struct device_attribute *da,
+					char *buf, int channel)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	struct smpro_int_error_hdr *err_info;
+	unsigned int warn[2] = { 0 };
+	unsigned int val;
+	int ret;
+
+	/* read error status */
+	ret = regmap_read(errmon->regmap, GPI_RAS_ERR, &val);
+	if (ret)
+		return ret;
+
+	if ((channel == RAS_SMPRO_ERR && !(val & BIT(0))) ||
+	    (channel == RAS_PMPRO_ERR && !(val & BIT(1))))
+		return 0;
+
+	err_info = &list_smpro_int_error_hdr[channel];
+	ret = regmap_read(errmon->regmap, err_info->type, &val);
+	if (ret)
+		return ret;
+
+	if (!(val & BIT(0)))
+		return 0;
+
+	ret = regmap_read(errmon->regmap, err_info->warn_l, warn + 1);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(errmon->regmap, err_info->warn_h, warn);
+	if (ret)
+		return ret;
+
+	/* clear the warning */
+	ret = regmap_write(errmon->regmap, err_info->type, BIT(0));
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%*phN\n", (int)sizeof(warn), warn);
+}
+
+#define ERROR_OVERFLOW_RO(_error, _index) \
+	static ssize_t overflow_##_error##_show(struct device *dev,            \
+						struct device_attribute *da,   \
+						char *buf)                     \
+	{                                                                      \
+		return smpro_overflow_data_read(dev, da, buf, _index);         \
+	}                                                                      \
+	static DEVICE_ATTR_RO(overflow_##_error)
+
+ERROR_OVERFLOW_RO(core_ce, CORE_CE_ERR);
+ERROR_OVERFLOW_RO(core_ue, CORE_UE_ERR);
+ERROR_OVERFLOW_RO(mem_ce, MEM_CE_ERR);
+ERROR_OVERFLOW_RO(mem_ue, MEM_UE_ERR);
+ERROR_OVERFLOW_RO(pcie_ce, PCIE_CE_ERR);
+ERROR_OVERFLOW_RO(pcie_ue, PCIE_UE_ERR);
+ERROR_OVERFLOW_RO(other_ce, OTHER_CE_ERR);
+ERROR_OVERFLOW_RO(other_ue, OTHER_UE_ERR);
+
+#define ERROR_RO(_error, _index) \
+	static ssize_t error_##_error##_show(struct device *dev,            \
+					     struct device_attribute *da,   \
+					     char *buf)                     \
+	{                                                                   \
+		return smpro_error_data_read(dev, da, buf, _index);         \
+	}                                                                   \
+	static DEVICE_ATTR_RO(error_##_error)
+
+ERROR_RO(core_ce, CORE_CE_ERR);
+ERROR_RO(core_ue, CORE_UE_ERR);
+ERROR_RO(mem_ce, MEM_CE_ERR);
+ERROR_RO(mem_ue, MEM_UE_ERR);
+ERROR_RO(pcie_ce, PCIE_CE_ERR);
+ERROR_RO(pcie_ue, PCIE_UE_ERR);
+ERROR_RO(other_ce, OTHER_CE_ERR);
+ERROR_RO(other_ue, OTHER_UE_ERR);
+
+static ssize_t error_smpro_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+	return smpro_internal_err_read(dev, da, buf, RAS_SMPRO_ERR);
+}
+static DEVICE_ATTR_RO(error_smpro);
+
+static ssize_t error_pmpro_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+	return smpro_internal_err_read(dev, da, buf, RAS_PMPRO_ERR);
+}
+static DEVICE_ATTR_RO(error_pmpro);
+
+static ssize_t warn_smpro_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+	return smpro_internal_warn_read(dev, da, buf, RAS_SMPRO_ERR);
+}
+static DEVICE_ATTR_RO(warn_smpro);
+
+static ssize_t warn_pmpro_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+	return smpro_internal_warn_read(dev, da, buf, RAS_PMPRO_ERR);
+}
+static DEVICE_ATTR_RO(warn_pmpro);
+
+#define EVENT_RO(_event, _index) \
+	static ssize_t event_##_event##_show(struct device *dev,            \
+					     struct device_attribute *da,   \
+					     char *buf)                     \
+	{                                                                   \
+		return smpro_event_data_read(dev, da, buf, _index);         \
+	}                                                                   \
+	static DEVICE_ATTR_RO(event_##_event)
+
+EVENT_RO(vrd_warn_fault, VRD_WARN_FAULT_EVENT);
+EVENT_RO(vrd_hot, VRD_HOT_EVENT);
+EVENT_RO(dimm_hot, DIMM_HOT_EVENT);
+EVENT_RO(dimm_2x_refresh, DIMM_2X_REFRESH_EVENT);
+
+static ssize_t smpro_dimm_syndrome_read(struct device *dev, struct device_attribute *da,
+					char *buf, unsigned int slot)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	unsigned int data;
+	int ret;
+
+	ret = regmap_read(errmon->regmap, BOOTSTAGE, &data);
+	if (ret)
+		return ret;
+
+	/* check for valid stage */
+	data = (data >> 8) & 0xff;
+	if (data != DIMM_SYNDROME_STAGE)
+		return ret;
+
+	/* Write the slot ID to retrieve Error Syndrome */
+	ret = regmap_write(errmon->regmap, DIMM_SYNDROME_SEL, slot);
+	if (ret)
+		return ret;
+
+	/* Read the Syndrome error */
+	ret = regmap_read(errmon->regmap, DIMM_SYNDROME_ERR, &data);
+	if (ret || !data)
+		return ret;
+
+	return sysfs_emit(buf, "%04x\n", data);
+}
+
+#define EVENT_DIMM_SYNDROME(_slot) \
+	static ssize_t event_dimm##_slot##_syndrome_show(struct device *dev,          \
+							 struct device_attribute *da, \
+							 char *buf)                   \
+	{                                                                             \
+		return smpro_dimm_syndrome_read(dev, da, buf, _slot);                 \
+	}                                                                             \
+	static DEVICE_ATTR_RO(event_dimm##_slot##_syndrome)
+
+EVENT_DIMM_SYNDROME(0);
+EVENT_DIMM_SYNDROME(1);
+EVENT_DIMM_SYNDROME(2);
+EVENT_DIMM_SYNDROME(3);
+EVENT_DIMM_SYNDROME(4);
+EVENT_DIMM_SYNDROME(5);
+EVENT_DIMM_SYNDROME(6);
+EVENT_DIMM_SYNDROME(7);
+EVENT_DIMM_SYNDROME(8);
+EVENT_DIMM_SYNDROME(9);
+EVENT_DIMM_SYNDROME(10);
+EVENT_DIMM_SYNDROME(11);
+EVENT_DIMM_SYNDROME(12);
+EVENT_DIMM_SYNDROME(13);
+EVENT_DIMM_SYNDROME(14);
+EVENT_DIMM_SYNDROME(15);
+
+static struct attribute *smpro_errmon_attrs[] = {
+	&dev_attr_overflow_core_ce.attr,
+	&dev_attr_overflow_core_ue.attr,
+	&dev_attr_overflow_mem_ce.attr,
+	&dev_attr_overflow_mem_ue.attr,
+	&dev_attr_overflow_pcie_ce.attr,
+	&dev_attr_overflow_pcie_ue.attr,
+	&dev_attr_overflow_other_ce.attr,
+	&dev_attr_overflow_other_ue.attr,
+	&dev_attr_error_core_ce.attr,
+	&dev_attr_error_core_ue.attr,
+	&dev_attr_error_mem_ce.attr,
+	&dev_attr_error_mem_ue.attr,
+	&dev_attr_error_pcie_ce.attr,
+	&dev_attr_error_pcie_ue.attr,
+	&dev_attr_error_other_ce.attr,
+	&dev_attr_error_other_ue.attr,
+	&dev_attr_error_smpro.attr,
+	&dev_attr_error_pmpro.attr,
+	&dev_attr_warn_smpro.attr,
+	&dev_attr_warn_pmpro.attr,
+	&dev_attr_event_vrd_warn_fault.attr,
+	&dev_attr_event_vrd_hot.attr,
+	&dev_attr_event_dimm_hot.attr,
+	&dev_attr_event_dimm_2x_refresh.attr,
+	&dev_attr_event_dimm0_syndrome.attr,
+	&dev_attr_event_dimm1_syndrome.attr,
+	&dev_attr_event_dimm2_syndrome.attr,
+	&dev_attr_event_dimm3_syndrome.attr,
+	&dev_attr_event_dimm4_syndrome.attr,
+	&dev_attr_event_dimm5_syndrome.attr,
+	&dev_attr_event_dimm6_syndrome.attr,
+	&dev_attr_event_dimm7_syndrome.attr,
+	&dev_attr_event_dimm8_syndrome.attr,
+	&dev_attr_event_dimm9_syndrome.attr,
+	&dev_attr_event_dimm10_syndrome.attr,
+	&dev_attr_event_dimm11_syndrome.attr,
+	&dev_attr_event_dimm12_syndrome.attr,
+	&dev_attr_event_dimm13_syndrome.attr,
+	&dev_attr_event_dimm14_syndrome.attr,
+	&dev_attr_event_dimm15_syndrome.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(smpro_errmon);
+
+static int smpro_errmon_probe(struct platform_device *pdev)
+{
+	struct smpro_errmon *errmon;
+
+	errmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_errmon), GFP_KERNEL);
+	if (!errmon)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, errmon);
+
+	errmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!errmon->regmap)
+		return -ENODEV;
+
+	return 0;
+}
+
+static struct platform_driver smpro_errmon_driver = {
+	.probe          = smpro_errmon_probe,
+	.driver = {
+		.name   = "smpro-errmon",
+		.dev_groups = smpro_errmon_groups,
+	},
+};
+
+module_platform_driver(smpro_errmon_driver);
+
+MODULE_AUTHOR("Tung Nguyen <tung.nguyen@amperecomputing.com>");
+MODULE_AUTHOR("Thinh Pham <thinh.pham@amperecomputing.com>");
+MODULE_AUTHOR("Hoang Nguyen <hnguyen@amperecomputing.com>");
+MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");
+MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
+MODULE_DESCRIPTION("Ampere Altra SMpro driver");
+MODULE_LICENSE("GPL");