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RAS: Add helpers to access Standard Error Records

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The ARMv8 RAS Extensions introduced Standard Error Records which are a
set of standard registers through which:

  - Platform can configure RAS node policy; e.g., notification
    mechanism;

  - RAS nodes can record and expose error information for error handling
    agents.

Standard Error Records can either be accessed via. memory-mapped
or System registers. This patch adds helper functions to access
registers and fields within an error record.

Change-Id: I6594ba799f4a1789d7b1e45b3e17fd40e7e0ba5c
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
This commit is contained in:
Jeenu Viswambharan 2017-12-07 08:43:05 +00:00
parent 14c6016ad5
commit 30d81c36da
5 changed files with 332 additions and 1 deletions
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76
lib/extensions/ras/std_err_record.c Normal file
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/*
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <ras_arch.h>
#include <utils_def.h>
/*
* Probe for error in memory-mapped registers containing error records
* implemented Standard Error Record format. Upon detecting an error, set probe
* data to the index of the record in error, and return 1; otherwise, return 0.
*/
int ser_probe_memmap(uintptr_t base, unsigned int size_num_k, int *probe_data)
{
int num_records, num_group_regs, i;
uint64_t gsr;
assert(base != 0);
/* Only 4K supported for now */
assert(size_num_k == STD_ERR_NODE_SIZE_NUM_K);
num_records = (mmio_read_32(ERR_DEVID(base, size_num_k)) & ERR_DEVID_MASK);
/* A group register shows error status for 2^6 error records */
num_group_regs = (num_records >> 6) + 1;
/* Iterate through group registers to find a record in error */
for (i = 0; i < num_group_regs; i++) {
gsr = mmio_read_64(ERR_GSR(base, size_num_k, i));
if (gsr == 0)
continue;
/* Return the index of the record in error */
if (probe_data != NULL)
*probe_data = ((i << 6) + __builtin_ctz(gsr));
return 1;
}
return 0;
}
/*
* Probe for error in System Registers where error records are implemented in
* Standard Error Record format. Upon detecting an error, set probe data to the
* index of the record in error, and return 1; otherwise, return 0.
*/
int ser_probe_sysreg(unsigned int idx_start, unsigned int num_idx, int *probe_data)
{
int i;
uint64_t status;
unsigned int max_idx __unused = read_erridr_el1() & ERRIDR_MASK;
assert(idx_start < max_idx);
assert(check_u32_overflow(idx_start, num_idx) == 0);
assert((idx_start + num_idx - 1) < max_idx);
for (i = 0; i < num_idx; i++) {
/* Select the error record */
ser_sys_select_record(idx_start + i);
/* Retrieve status register from the error record */
status = read_erxstatus_el1();
/* Check for valid field in status */
if (ERR_STATUS_GET_FIELD(status, V)) {
if (probe_data != NULL)
*probe_data = i;
return 1;
}
}
return 0;
}