Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 1 | /* |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 2 | * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <arch_helpers.h> |
| 9 | #include <pubsub.h> |
| 10 | |
| 11 | /* |
| 12 | * The assembler does not yet understand the psb csync mnemonic |
| 13 | * so use the equivalent hint instruction. |
| 14 | */ |
| 15 | #define psb_csync() asm volatile("hint #17") |
| 16 | |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 17 | int spe_supported(void) |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 18 | { |
| 19 | uint64_t features; |
| 20 | |
| 21 | features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT; |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 22 | return (features & ID_AA64DFR0_PMS_MASK) == 1; |
| 23 | } |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 24 | |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 25 | void spe_enable(int el2_unused) |
| 26 | { |
| 27 | uint64_t v; |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 28 | |
Dimitris Papastamos | 700efdd | 2018-02-26 17:56:31 +0000 | [diff] [blame^] | 29 | if (spe_supported() == 0) |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 30 | return; |
| 31 | |
| 32 | if (el2_unused) { |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 33 | /* |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 34 | * MDCR_EL2.TPMS (ARM v8.2): Do not trap statistical |
| 35 | * profiling controls to EL2. |
| 36 | * |
| 37 | * MDCR_EL2.E2PB (ARM v8.2): SPE enabled in Non-secure |
| 38 | * state. Accesses to profiling buffer controls at |
| 39 | * Non-secure EL1 are not trapped to EL2. |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 40 | */ |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 41 | v = read_mdcr_el2(); |
| 42 | v &= ~MDCR_EL2_TPMS; |
| 43 | v |= MDCR_EL2_E2PB(MDCR_EL2_E2PB_EL1); |
| 44 | write_mdcr_el2(v); |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 45 | } |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 46 | |
| 47 | /* |
| 48 | * MDCR_EL2.NSPB (ARM v8.2): SPE enabled in Non-secure state |
| 49 | * and disabled in secure state. Accesses to SPE registers at |
| 50 | * S-EL1 generate trap exceptions to EL3. |
| 51 | */ |
| 52 | v = read_mdcr_el3(); |
| 53 | v |= MDCR_NSPB(MDCR_NSPB_EL1); |
| 54 | write_mdcr_el3(v); |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | void spe_disable(void) |
| 58 | { |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 59 | uint64_t v; |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 60 | |
Dimitris Papastamos | 700efdd | 2018-02-26 17:56:31 +0000 | [diff] [blame^] | 61 | if (spe_supported() == 0) |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 62 | return; |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 63 | |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 64 | /* Drain buffered data */ |
| 65 | psb_csync(); |
| 66 | dsbnsh(); |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 67 | |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 68 | /* Disable profiling buffer */ |
| 69 | v = read_pmblimitr_el1(); |
| 70 | v &= ~(1ULL << 0); |
| 71 | write_pmblimitr_el1(v); |
| 72 | isb(); |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static void *spe_drain_buffers_hook(const void *arg) |
| 76 | { |
Dimitris Papastamos | 700efdd | 2018-02-26 17:56:31 +0000 | [diff] [blame^] | 77 | if (spe_supported() == 0) |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 78 | return (void *)-1; |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 79 | |
Dimitris Papastamos | 2ff8fbf | 2018-02-19 14:52:19 +0000 | [diff] [blame] | 80 | /* Drain buffered data */ |
| 81 | psb_csync(); |
| 82 | dsbnsh(); |
Dimitris Papastamos | 281a08c | 2017-10-13 12:06:06 +0100 | [diff] [blame] | 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | SUBSCRIBE_TO_EVENT(cm_entering_secure_world, spe_drain_buffers_hook); |