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1 /*
2  * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <lib/extensions/ras_arch.h>
8 #include <lib/utils_def.h>
9 
10 /*
11  * Probe for error in memory-mapped registers containing error records
12  * implemented Standard Error Record format. Upon detecting an error, set probe
13  * data to the index of the record in error, and return 1; otherwise, return 0.
14  */
ser_probe_memmap(uintptr_t base,unsigned int size_num_k,int * probe_data)15 int ser_probe_memmap(uintptr_t base, unsigned int size_num_k, int *probe_data)
16 {
17 	unsigned int num_records, num_group_regs, i;
18 	uint64_t gsr;
19 
20 	assert(base != 0UL);
21 
22 	/* Only 4K supported for now */
23 	assert(size_num_k == STD_ERR_NODE_SIZE_NUM_K);
24 
25 	num_records = (unsigned int)
26 		(mmio_read_32(ERR_DEVID(base, size_num_k)) & ERR_DEVID_MASK);
27 
28 	/* A group register shows error status for 2^6 error records */
29 	num_group_regs = (num_records >> 6U) + 1U;
30 
31 	/* Iterate through group registers to find a record in error */
32 	for (i = 0; i < num_group_regs; i++) {
33 		gsr = mmio_read_64(ERR_GSR(base, size_num_k, i));
34 		if (gsr == 0ULL)
35 			continue;
36 
37 		/* Return the index of the record in error */
38 		if (probe_data != NULL)
39 			*probe_data = (((int) (i << 6U)) + __builtin_ctzll(gsr));
40 
41 		return 1;
42 	}
43 
44 	return 0;
45 }
46 
47 /*
48  * Probe for error in System Registers where error records are implemented in
49  * Standard Error Record format. Upon detecting an error, set probe data to the
50  * index of the record in error, and return 1; otherwise, return 0.
51  */
ser_probe_sysreg(unsigned int idx_start,unsigned int num_idx,int * probe_data)52 int ser_probe_sysreg(unsigned int idx_start, unsigned int num_idx, int *probe_data)
53 {
54 	unsigned int i;
55 	uint64_t status;
56 	unsigned int max_idx __unused =
57 		((unsigned int) read_erridr_el1()) & ERRIDR_MASK;
58 
59 	assert(idx_start < max_idx);
60 	assert(check_u32_overflow(idx_start, num_idx) == 0);
61 	assert((idx_start + num_idx - 1U) < max_idx);
62 
63 	for (i = 0; i < num_idx; i++) {
64 		/* Select the error record */
65 		ser_sys_select_record(idx_start + i);
66 
67 		/* Retrieve status register from the error record */
68 		status = read_erxstatus_el1();
69 
70 		/* Check for valid field in status */
71 		if (ERR_STATUS_GET_FIELD(status, V) != 0U) {
72 			if (probe_data != NULL)
73 				*probe_data = (int) i;
74 			return 1;
75 		}
76 	}
77 
78 	return 0;
79 }
80