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30d81c36da
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>
76 lines
2 KiB
C
76 lines
2 KiB
C
/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <ras_arch.h>
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#include <utils_def.h>
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/*
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* Probe for error in memory-mapped registers containing error records
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* implemented Standard Error Record format. Upon detecting an error, set probe
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* data to the index of the record in error, and return 1; otherwise, return 0.
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*/
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int ser_probe_memmap(uintptr_t base, unsigned int size_num_k, int *probe_data)
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{
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int num_records, num_group_regs, i;
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uint64_t gsr;
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assert(base != 0);
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/* Only 4K supported for now */
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assert(size_num_k == STD_ERR_NODE_SIZE_NUM_K);
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num_records = (mmio_read_32(ERR_DEVID(base, size_num_k)) & ERR_DEVID_MASK);
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/* A group register shows error status for 2^6 error records */
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num_group_regs = (num_records >> 6) + 1;
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/* Iterate through group registers to find a record in error */
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for (i = 0; i < num_group_regs; i++) {
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gsr = mmio_read_64(ERR_GSR(base, size_num_k, i));
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if (gsr == 0)
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continue;
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/* Return the index of the record in error */
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if (probe_data != NULL)
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*probe_data = ((i << 6) + __builtin_ctz(gsr));
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return 1;
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}
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return 0;
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}
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/*
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* Probe for error in System Registers where error records are implemented in
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* Standard Error Record format. Upon detecting an error, set probe data to the
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* index of the record in error, and return 1; otherwise, return 0.
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*/
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int ser_probe_sysreg(unsigned int idx_start, unsigned int num_idx, int *probe_data)
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{
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int i;
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uint64_t status;
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unsigned int max_idx __unused = read_erridr_el1() & ERRIDR_MASK;
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assert(idx_start < max_idx);
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assert(check_u32_overflow(idx_start, num_idx) == 0);
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assert((idx_start + num_idx - 1) < max_idx);
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for (i = 0; i < num_idx; i++) {
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/* Select the error record */
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ser_sys_select_record(idx_start + i);
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/* Retrieve status register from the error record */
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status = read_erxstatus_el1();
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/* Check for valid field in status */
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if (ERR_STATUS_GET_FIELD(status, V)) {
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if (probe_data != NULL)
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*probe_data = i;
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return 1;
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}
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}
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return 0;
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}
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