PM / runtime: Asynchronous "idle" in pm_runtime_allow()
[cascardo/linux.git] / arch / arm64 / kernel / cpu_errata.c
1 /*
2  * Contains CPU specific errata definitions
3  *
4  * Copyright (C) 2014 ARM Ltd.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include <linux/types.h>
20 #include <asm/cpu.h>
21 #include <asm/cputype.h>
22 #include <asm/cpufeature.h>
23
24 static bool __maybe_unused
25 is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
26 {
27         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
28         return MIDR_IS_CPU_MODEL_RANGE(read_cpuid_id(), entry->midr_model,
29                                        entry->midr_range_min,
30                                        entry->midr_range_max);
31 }
32
33 #define MIDR_RANGE(model, min, max) \
34         .def_scope = SCOPE_LOCAL_CPU, \
35         .matches = is_affected_midr_range, \
36         .midr_model = model, \
37         .midr_range_min = min, \
38         .midr_range_max = max
39
40 const struct arm64_cpu_capabilities arm64_errata[] = {
41 #if     defined(CONFIG_ARM64_ERRATUM_826319) || \
42         defined(CONFIG_ARM64_ERRATUM_827319) || \
43         defined(CONFIG_ARM64_ERRATUM_824069)
44         {
45         /* Cortex-A53 r0p[012] */
46                 .desc = "ARM errata 826319, 827319, 824069",
47                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
48                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02),
49         },
50 #endif
51 #ifdef CONFIG_ARM64_ERRATUM_819472
52         {
53         /* Cortex-A53 r0p[01] */
54                 .desc = "ARM errata 819472",
55                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
56                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x01),
57         },
58 #endif
59 #ifdef CONFIG_ARM64_ERRATUM_832075
60         {
61         /* Cortex-A57 r0p0 - r1p2 */
62                 .desc = "ARM erratum 832075",
63                 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
64                 MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
65                            (1 << MIDR_VARIANT_SHIFT) | 2),
66         },
67 #endif
68 #ifdef CONFIG_ARM64_ERRATUM_834220
69         {
70         /* Cortex-A57 r0p0 - r1p2 */
71                 .desc = "ARM erratum 834220",
72                 .capability = ARM64_WORKAROUND_834220,
73                 MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
74                            (1 << MIDR_VARIANT_SHIFT) | 2),
75         },
76 #endif
77 #ifdef CONFIG_ARM64_ERRATUM_845719
78         {
79         /* Cortex-A53 r0p[01234] */
80                 .desc = "ARM erratum 845719",
81                 .capability = ARM64_WORKAROUND_845719,
82                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x04),
83         },
84 #endif
85 #ifdef CONFIG_CAVIUM_ERRATUM_23154
86         {
87         /* Cavium ThunderX, pass 1.x */
88                 .desc = "Cavium erratum 23154",
89                 .capability = ARM64_WORKAROUND_CAVIUM_23154,
90                 MIDR_RANGE(MIDR_THUNDERX, 0x00, 0x01),
91         },
92 #endif
93 #ifdef CONFIG_CAVIUM_ERRATUM_27456
94         {
95         /* Cavium ThunderX, T88 pass 1.x - 2.1 */
96                 .desc = "Cavium erratum 27456",
97                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
98                 MIDR_RANGE(MIDR_THUNDERX, 0x00,
99                            (1 << MIDR_VARIANT_SHIFT) | 1),
100         },
101 #endif
102         {
103         }
104 };
105
106 /*
107  * The CPU Errata work arounds are detected and applied at boot time
108  * and the related information is freed soon after. If the new CPU requires
109  * an errata not detected at boot, fail this CPU.
110  */
111 void verify_local_cpu_errata(void)
112 {
113         const struct arm64_cpu_capabilities *caps = arm64_errata;
114
115         for (; caps->matches; caps++)
116                 if (!cpus_have_cap(caps->capability) &&
117                         caps->matches(caps, SCOPE_LOCAL_CPU)) {
118                         pr_crit("CPU%d: Requires work around for %s, not detected"
119                                         " at boot time\n",
120                                 smp_processor_id(),
121                                 caps->desc ? : "an erratum");
122                         cpu_die_early();
123                 }
124 }
125
126 void check_local_cpu_errata(void)
127 {
128         update_cpu_capabilities(arm64_errata, "enabling workaround for");
129 }