projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 1da177e4 | 2 | /* |
| f7f6f4fe | 3 | * arch/powerpc/kernel/pmc.c |
| 1da177e4 LT |
4 | * |
| 5 | * Copyright (C) 2004 David Gibson, IBM Corporation. | |
| f7f6f4fe DG |
6 | * Includes code formerly from arch/ppc/kernel/perfmon.c: |
| 7 | * Author: Andy Fleming | |
| 8 | * Copyright (c) 2004 Freescale Semiconductor, Inc | |
| 1da177e4 LT |
9 | */ |
| 10 | ||
| 1da177e4 | 11 | #include <linux/errno.h> |
| 50af5ead | 12 | #include <linux/bug.h> |
| 1da177e4 | 13 | #include <linux/spinlock.h> |
| 4b16f8e2 | 14 | #include <linux/export.h> |
| 1da177e4 LT |
15 | |
| 16 | #include <asm/processor.h> | |
| 6529c13d | 17 | #include <asm/cputable.h> |
| 1da177e4 LT |
18 | #include <asm/pmc.h> |
| 19 | ||
| 177e9ea4 AB |
20 | #ifndef MMCR0_PMAO |
| 21 | #define MMCR0_PMAO 0 | |
| f7f6f4fe DG |
22 | #endif |
| 23 | ||
| 1da177e4 LT |
24 | static void dummy_perf(struct pt_regs *regs) |
| 25 | { | |
| 39aef685 | 26 | #if defined(CONFIG_FSL_EMB_PERFMON) |
| 1bd2e5ae | 27 | mtpmr(PMRN_PMGC0, mfpmr(PMRN_PMGC0) & ~PMGC0_PMIE); |
| d7cceda9 | 28 | #elif defined(CONFIG_PPC64) || defined(CONFIG_PPC_BOOK3S_32) |
| 6529c13d | 29 | if (cur_cpu_spec->pmc_type == PPC_PMC_IBM) |
| 177e9ea4 | 30 | mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~(MMCR0_PMXE|MMCR0_PMAO)); |
| f7f6f4fe | 31 | #else |
| 1bd2e5ae | 32 | mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_PMXE); |
| f7f6f4fe | 33 | #endif |
| 1bd2e5ae OJ |
34 | } |
| 35 | ||
| 1da177e4 | 36 | |
| 071c06cb | 37 | static DEFINE_RAW_SPINLOCK(pmc_owner_lock); |
| 1da177e4 LT |
38 | static void *pmc_owner_caller; /* mostly for debugging */ |
| 39 | perf_irq_t perf_irq = dummy_perf; | |
| 40 | ||
| 41 | int reserve_pmc_hardware(perf_irq_t new_perf_irq) | |
| 42 | { | |
| 43 | int err = 0; | |
| 44 | ||
| 071c06cb | 45 | raw_spin_lock(&pmc_owner_lock); |
| 1da177e4 LT |
46 | |
| 47 | if (pmc_owner_caller) { | |
| 48 | printk(KERN_WARNING "reserve_pmc_hardware: " | |
| 49 | "PMC hardware busy (reserved by caller %p)\n", | |
| 50 | pmc_owner_caller); | |
| 51 | err = -EBUSY; | |
| 52 | goto out; | |
| 53 | } | |
| 54 | ||
| 55 | pmc_owner_caller = __builtin_return_address(0); | |
| dd6c89f6 | 56 | perf_irq = new_perf_irq ? new_perf_irq : dummy_perf; |
| 1da177e4 LT |
57 | |
| 58 | out: | |
| 071c06cb | 59 | raw_spin_unlock(&pmc_owner_lock); |
| 1da177e4 LT |
60 | return err; |
| 61 | } | |
| 62 | EXPORT_SYMBOL_GPL(reserve_pmc_hardware); | |
| 63 | ||
| 64 | void release_pmc_hardware(void) | |
| 65 | { | |
| 071c06cb | 66 | raw_spin_lock(&pmc_owner_lock); |
| 1da177e4 LT |
67 | |
| 68 | WARN_ON(! pmc_owner_caller); | |
| 69 | ||
| 70 | pmc_owner_caller = NULL; | |
| 71 | perf_irq = dummy_perf; | |
| 72 | ||
| 071c06cb | 73 | raw_spin_unlock(&pmc_owner_lock); |
| 1da177e4 LT |
74 | } |
| 75 | EXPORT_SYMBOL_GPL(release_pmc_hardware); | |
| 180a3362 | 76 | |
| f7f6f4fe | 77 | #ifdef CONFIG_PPC64 |
| 180a3362 ME |
78 | void power4_enable_pmcs(void) |
| 79 | { | |
| 80 | unsigned long hid0; | |
| 81 | ||
| b5bbeb23 | 82 | hid0 = mfspr(SPRN_HID0); |
| 180a3362 ME |
83 | hid0 |= 1UL << (63 - 20); |
| 84 | ||
| 85 | /* POWER4 requires the following sequence */ | |
| 86 | asm volatile( | |
| 87 | "sync\n" | |
| 88 | "mtspr %1, %0\n" | |
| 89 | "mfspr %0, %1\n" | |
| 90 | "mfspr %0, %1\n" | |
| 91 | "mfspr %0, %1\n" | |
| 92 | "mfspr %0, %1\n" | |
| 93 | "mfspr %0, %1\n" | |
| 94 | "mfspr %0, %1\n" | |
| b5bbeb23 | 95 | "isync" : "=&r" (hid0) : "i" (SPRN_HID0), "0" (hid0): |
| 180a3362 ME |
96 | "memory"); |
| 97 | } | |
| f7f6f4fe | 98 | #endif /* CONFIG_PPC64 */ |