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1248 lines
30 KiB
1248 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PowerNV OPAL high level interfaces |
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* |
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* Copyright 2011 IBM Corp. |
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*/ |
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|
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#define pr_fmt(fmt) "opal: " fmt |
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#include <linux/printk.h> |
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#include <linux/types.h> |
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#include <linux/of.h> |
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#include <linux/of_fdt.h> |
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#include <linux/of_platform.h> |
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#include <linux/of_address.h> |
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#include <linux/interrupt.h> |
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#include <linux/notifier.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/kobject.h> |
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#include <linux/delay.h> |
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#include <linux/memblock.h> |
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#include <linux/kthread.h> |
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#include <linux/freezer.h> |
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#include <linux/kmsg_dump.h> |
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#include <linux/console.h> |
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#include <linux/sched/debug.h> |
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#include <asm/machdep.h> |
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#include <asm/opal.h> |
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#include <asm/firmware.h> |
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#include <asm/mce.h> |
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#include <asm/imc-pmu.h> |
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#include <asm/bug.h> |
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#include "powernv.h" |
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#define OPAL_MSG_QUEUE_MAX 16 |
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struct opal_msg_node { |
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struct list_head list; |
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struct opal_msg msg; |
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}; |
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static DEFINE_SPINLOCK(msg_list_lock); |
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static LIST_HEAD(msg_list); |
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/* /sys/firmware/opal */ |
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struct kobject *opal_kobj; |
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struct opal { |
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u64 base; |
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u64 entry; |
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u64 size; |
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} opal; |
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struct mcheck_recoverable_range { |
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u64 start_addr; |
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u64 end_addr; |
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u64 recover_addr; |
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}; |
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static int msg_list_size; |
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static struct mcheck_recoverable_range *mc_recoverable_range; |
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static int mc_recoverable_range_len; |
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struct device_node *opal_node; |
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static DEFINE_SPINLOCK(opal_write_lock); |
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static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
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static uint32_t opal_heartbeat; |
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static struct task_struct *kopald_tsk; |
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static struct opal_msg *opal_msg; |
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static u32 opal_msg_size __ro_after_init; |
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void opal_configure_cores(void) |
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{ |
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u64 reinit_flags = 0; |
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|
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/* Do the actual re-init, This will clobber all FPRs, VRs, etc... |
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* |
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* It will preserve non volatile GPRs and HSPRG0/1. It will |
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* also restore HIDs and other SPRs to their original value |
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* but it might clobber a bunch. |
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*/ |
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#ifdef __BIG_ENDIAN__ |
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reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; |
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#else |
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reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; |
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#endif |
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/* |
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* POWER9 always support running hash: |
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* ie. Host hash supports hash guests |
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* Host radix supports hash/radix guests |
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*/ |
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if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { |
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reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; |
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if (early_radix_enabled()) |
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reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; |
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} |
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opal_reinit_cpus(reinit_flags); |
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/* Restore some bits */ |
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if (cur_cpu_spec->cpu_restore) |
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cur_cpu_spec->cpu_restore(); |
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} |
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int __init early_init_dt_scan_opal(unsigned long node, |
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const char *uname, int depth, void *data) |
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{ |
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const void *basep, *entryp, *sizep; |
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int basesz, entrysz, runtimesz; |
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if (depth != 1 || strcmp(uname, "ibm,opal") != 0) |
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return 0; |
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basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); |
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entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); |
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sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
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if (!basep || !entryp || !sizep) |
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return 1; |
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opal.base = of_read_number(basep, basesz/4); |
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opal.entry = of_read_number(entryp, entrysz/4); |
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opal.size = of_read_number(sizep, runtimesz/4); |
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pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
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opal.base, basep, basesz); |
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pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
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opal.entry, entryp, entrysz); |
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pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
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opal.size, sizep, runtimesz); |
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if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
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powerpc_firmware_features |= FW_FEATURE_OPAL; |
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pr_debug("OPAL detected !\n"); |
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} else { |
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panic("OPAL != V3 detected, no longer supported.\n"); |
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} |
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return 1; |
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} |
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int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
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const char *uname, int depth, void *data) |
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{ |
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int i, psize, size; |
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const __be32 *prop; |
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if (depth != 1 || strcmp(uname, "ibm,opal") != 0) |
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return 0; |
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prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
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if (!prop) |
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return 1; |
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pr_debug("Found machine check recoverable ranges.\n"); |
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/* |
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* Calculate number of available entries. |
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* |
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* Each recoverable address range entry is (start address, len, |
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* recovery address), 2 cells each for start and recovery address, |
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* 1 cell for len, totalling 5 cells per entry. |
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*/ |
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mc_recoverable_range_len = psize / (sizeof(*prop) * 5); |
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/* Sanity check */ |
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if (!mc_recoverable_range_len) |
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return 1; |
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/* Size required to hold all the entries. */ |
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size = mc_recoverable_range_len * |
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sizeof(struct mcheck_recoverable_range); |
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/* |
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* Allocate a buffer to hold the MC recoverable ranges. |
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*/ |
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mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); |
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if (!mc_recoverable_range) |
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panic("%s: Failed to allocate %u bytes align=0x%lx\n", |
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__func__, size, __alignof__(u64)); |
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for (i = 0; i < mc_recoverable_range_len; i++) { |
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mc_recoverable_range[i].start_addr = |
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of_read_number(prop + (i * 5) + 0, 2); |
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mc_recoverable_range[i].end_addr = |
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mc_recoverable_range[i].start_addr + |
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of_read_number(prop + (i * 5) + 2, 1); |
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mc_recoverable_range[i].recover_addr = |
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of_read_number(prop + (i * 5) + 3, 2); |
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pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", |
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mc_recoverable_range[i].start_addr, |
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mc_recoverable_range[i].end_addr, |
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mc_recoverable_range[i].recover_addr); |
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} |
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return 1; |
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} |
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static int __init opal_register_exception_handlers(void) |
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{ |
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#ifdef __BIG_ENDIAN__ |
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u64 glue; |
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if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) |
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return -ENODEV; |
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/* Hookup some exception handlers except machine check. We use the |
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* fwnmi area at 0x7000 to provide the glue space to OPAL |
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*/ |
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glue = 0x7000; |
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/* |
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* Only ancient OPAL firmware requires this. |
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* Specifically, firmware from FW810.00 (released June 2014) |
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* through FW810.20 (Released October 2014). |
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* |
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* Check if we are running on newer (post Oct 2014) firmware that |
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* exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to |
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* patch the HMI interrupt and we catch it directly in Linux. |
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* |
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* For older firmware (i.e < FW810.20), we fallback to old behavior and |
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* let OPAL patch the HMI vector and handle it inside OPAL firmware. |
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* |
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* For newer firmware we catch/handle the HMI directly in Linux. |
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*/ |
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if (!opal_check_token(OPAL_HANDLE_HMI)) { |
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pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
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opal_register_exception_handler( |
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OPAL_HYPERVISOR_MAINTENANCE_HANDLER, |
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0, glue); |
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glue += 128; |
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} |
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/* |
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* Only applicable to ancient firmware, all modern |
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* (post March 2015/skiboot 5.0) firmware will just return |
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* OPAL_UNSUPPORTED. |
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*/ |
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opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
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#endif |
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return 0; |
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} |
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machine_early_initcall(powernv, opal_register_exception_handlers); |
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static void queue_replay_msg(void *msg) |
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{ |
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struct opal_msg_node *msg_node; |
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if (msg_list_size < OPAL_MSG_QUEUE_MAX) { |
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msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC); |
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if (msg_node) { |
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INIT_LIST_HEAD(&msg_node->list); |
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memcpy(&msg_node->msg, msg, sizeof(struct opal_msg)); |
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list_add_tail(&msg_node->list, &msg_list); |
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msg_list_size++; |
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} else |
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pr_warn_once("message queue no memory\n"); |
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if (msg_list_size >= OPAL_MSG_QUEUE_MAX) |
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pr_warn_once("message queue full\n"); |
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} |
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} |
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static void dequeue_replay_msg(enum opal_msg_type msg_type) |
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{ |
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struct opal_msg_node *msg_node, *tmp; |
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list_for_each_entry_safe(msg_node, tmp, &msg_list, list) { |
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if (be32_to_cpu(msg_node->msg.msg_type) != msg_type) |
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continue; |
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atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], |
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msg_type, |
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&msg_node->msg); |
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list_del(&msg_node->list); |
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kfree(msg_node); |
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msg_list_size--; |
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} |
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} |
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/* |
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* Opal message notifier based on message type. Allow subscribers to get |
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* notified for specific messgae type. |
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*/ |
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int opal_message_notifier_register(enum opal_msg_type msg_type, |
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struct notifier_block *nb) |
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{ |
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int ret; |
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unsigned long flags; |
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if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
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pr_warn("%s: Invalid arguments, msg_type:%d\n", |
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__func__, msg_type); |
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return -EINVAL; |
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} |
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spin_lock_irqsave(&msg_list_lock, flags); |
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ret = atomic_notifier_chain_register( |
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&opal_msg_notifier_head[msg_type], nb); |
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/* |
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* If the registration succeeded, replay any queued messages that came |
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* in prior to the notifier chain registration. msg_list_lock held here |
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* to ensure they're delivered prior to any subsequent messages. |
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*/ |
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if (ret == 0) |
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dequeue_replay_msg(msg_type); |
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spin_unlock_irqrestore(&msg_list_lock, flags); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
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int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
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struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_unregister( |
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&opal_msg_notifier_head[msg_type], nb); |
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} |
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EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
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static void opal_message_do_notify(uint32_t msg_type, void *msg) |
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{ |
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unsigned long flags; |
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bool queued = false; |
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spin_lock_irqsave(&msg_list_lock, flags); |
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if (opal_msg_notifier_head[msg_type].head == NULL) { |
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/* |
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* Queue up the msg since no notifiers have registered |
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* yet for this msg_type. |
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*/ |
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queue_replay_msg(msg); |
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queued = true; |
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} |
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spin_unlock_irqrestore(&msg_list_lock, flags); |
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if (queued) |
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return; |
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/* notify subscribers */ |
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atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], |
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msg_type, msg); |
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} |
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static void opal_handle_message(void) |
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{ |
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s64 ret; |
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u32 type; |
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ret = opal_get_msg(__pa(opal_msg), opal_msg_size); |
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/* No opal message pending. */ |
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if (ret == OPAL_RESOURCE) |
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return; |
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/* check for errors. */ |
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if (ret) { |
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pr_warn("%s: Failed to retrieve opal message, err=%lld\n", |
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__func__, ret); |
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return; |
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} |
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type = be32_to_cpu(opal_msg->msg_type); |
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/* Sanity check */ |
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if (type >= OPAL_MSG_TYPE_MAX) { |
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pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
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return; |
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} |
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opal_message_do_notify(type, (void *)opal_msg); |
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} |
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static irqreturn_t opal_message_notify(int irq, void *data) |
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{ |
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opal_handle_message(); |
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return IRQ_HANDLED; |
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} |
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static int __init opal_message_init(struct device_node *opal_node) |
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{ |
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int ret, i, irq; |
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ret = of_property_read_u32(opal_node, "opal-msg-size", &opal_msg_size); |
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if (ret) { |
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pr_notice("Failed to read opal-msg-size property\n"); |
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opal_msg_size = sizeof(struct opal_msg); |
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} |
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opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); |
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if (!opal_msg) { |
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opal_msg_size = sizeof(struct opal_msg); |
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/* Try to allocate fixed message size */ |
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opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); |
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BUG_ON(opal_msg == NULL); |
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} |
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for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) |
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ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); |
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irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
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if (!irq) { |
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pr_err("%s: Can't register OPAL event irq (%d)\n", |
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__func__, irq); |
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return irq; |
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} |
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ret = request_irq(irq, opal_message_notify, |
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IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); |
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if (ret) { |
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pr_err("%s: Can't request OPAL event irq (%d)\n", |
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__func__, ret); |
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return ret; |
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} |
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return 0; |
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} |
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int opal_get_chars(uint32_t vtermno, char *buf, int count) |
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{ |
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s64 rc; |
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__be64 evt, len; |
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if (!opal.entry) |
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return -ENODEV; |
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opal_poll_events(&evt); |
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if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
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return 0; |
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len = cpu_to_be64(count); |
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rc = opal_console_read(vtermno, &len, buf); |
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if (rc == OPAL_SUCCESS) |
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return be64_to_cpu(len); |
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return 0; |
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} |
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static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) |
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{ |
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unsigned long flags = 0 /* shut up gcc */; |
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int written; |
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__be64 olen; |
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s64 rc; |
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if (!opal.entry) |
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return -ENODEV; |
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if (atomic) |
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spin_lock_irqsave(&opal_write_lock, flags); |
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rc = opal_console_write_buffer_space(vtermno, &olen); |
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if (rc || be64_to_cpu(olen) < total_len) { |
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/* Closed -> drop characters */ |
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if (rc) |
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written = total_len; |
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else |
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written = -EAGAIN; |
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goto out; |
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} |
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|
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/* Should not get a partial write here because space is available. */ |
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olen = cpu_to_be64(total_len); |
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rc = opal_console_write(vtermno, &olen, data); |
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if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { |
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if (rc == OPAL_BUSY_EVENT) |
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opal_poll_events(NULL); |
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written = -EAGAIN; |
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goto out; |
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} |
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|
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/* Closed or other error drop */ |
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if (rc != OPAL_SUCCESS) { |
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written = opal_error_code(rc); |
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goto out; |
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} |
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|
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written = be64_to_cpu(olen); |
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if (written < total_len) { |
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if (atomic) { |
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/* Should not happen */ |
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pr_warn("atomic console write returned partial " |
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"len=%d written=%d\n", total_len, written); |
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} |
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if (!written) |
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written = -EAGAIN; |
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} |
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out: |
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if (atomic) |
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spin_unlock_irqrestore(&opal_write_lock, flags); |
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|
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return written; |
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} |
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|
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int opal_put_chars(uint32_t vtermno, const char *data, int total_len) |
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{ |
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return __opal_put_chars(vtermno, data, total_len, false); |
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} |
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|
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/* |
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* opal_put_chars_atomic will not perform partial-writes. Data will be |
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* atomically written to the terminal or not at all. This is not strictly |
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* true at the moment because console space can race with OPAL's console |
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* writes. |
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*/ |
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int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) |
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{ |
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return __opal_put_chars(vtermno, data, total_len, true); |
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} |
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|
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static s64 __opal_flush_console(uint32_t vtermno) |
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{ |
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s64 rc; |
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|
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if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { |
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__be64 evt; |
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|
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/* |
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* If OPAL_CONSOLE_FLUSH is not implemented in the firmware, |
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* the console can still be flushed by calling the polling |
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* function while it has OPAL_EVENT_CONSOLE_OUTPUT events. |
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*/ |
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WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); |
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|
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opal_poll_events(&evt); |
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if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) |
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return OPAL_SUCCESS; |
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return OPAL_BUSY; |
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|
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} else { |
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rc = opal_console_flush(vtermno); |
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if (rc == OPAL_BUSY_EVENT) { |
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opal_poll_events(NULL); |
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rc = OPAL_BUSY; |
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} |
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return rc; |
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} |
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|
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} |
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|
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/* |
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* opal_flush_console spins until the console is flushed |
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*/ |
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int opal_flush_console(uint32_t vtermno) |
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{ |
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for (;;) { |
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s64 rc = __opal_flush_console(vtermno); |
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|
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if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { |
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mdelay(1); |
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continue; |
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} |
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|
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return opal_error_code(rc); |
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} |
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} |
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|
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/* |
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* opal_flush_chars is an hvc interface that sleeps until the console is |
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* flushed if wait, otherwise it will return -EBUSY if the console has data, |
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* -EAGAIN if it has data and some of it was flushed. |
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*/ |
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int opal_flush_chars(uint32_t vtermno, bool wait) |
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{ |
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for (;;) { |
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s64 rc = __opal_flush_console(vtermno); |
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|
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if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { |
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if (wait) { |
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msleep(OPAL_BUSY_DELAY_MS); |
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continue; |
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} |
|
if (rc == OPAL_PARTIAL) |
|
return -EAGAIN; |
|
} |
|
|
|
return opal_error_code(rc); |
|
} |
|
} |
|
|
|
static int opal_recover_mce(struct pt_regs *regs, |
|
struct machine_check_event *evt) |
|
{ |
|
int recovered = 0; |
|
|
|
if (regs_is_unrecoverable(regs)) { |
|
/* If MSR_RI isn't set, we cannot recover */ |
|
pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
|
recovered = 0; |
|
} else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { |
|
/* Platform corrected itself */ |
|
recovered = 1; |
|
} else if (evt->severity == MCE_SEV_FATAL) { |
|
/* Fatal machine check */ |
|
pr_err("Machine check interrupt is fatal\n"); |
|
recovered = 0; |
|
} |
|
|
|
if (!recovered && evt->sync_error) { |
|
/* |
|
* Try to kill processes if we get a synchronous machine check |
|
* (e.g., one caused by execution of this instruction). This |
|
* will devolve into a panic if we try to kill init or are in |
|
* an interrupt etc. |
|
* |
|
* TODO: Queue up this address for hwpoisioning later. |
|
* TODO: This is not quite right for d-side machine |
|
* checks ->nip is not necessarily the important |
|
* address. |
|
*/ |
|
if ((user_mode(regs))) { |
|
_exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); |
|
recovered = 1; |
|
} else if (die_will_crash()) { |
|
/* |
|
* die() would kill the kernel, so better to go via |
|
* the platform reboot code that will log the |
|
* machine check. |
|
*/ |
|
recovered = 0; |
|
} else { |
|
die_mce("Machine check", regs, SIGBUS); |
|
recovered = 1; |
|
} |
|
} |
|
|
|
return recovered; |
|
} |
|
|
|
void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) |
|
{ |
|
panic_flush_kmsg_start(); |
|
|
|
pr_emerg("Hardware platform error: %s\n", msg); |
|
if (regs) |
|
show_regs(regs); |
|
smp_send_stop(); |
|
|
|
panic_flush_kmsg_end(); |
|
|
|
/* |
|
* Don't bother to shut things down because this will |
|
* xstop the system. |
|
*/ |
|
if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) |
|
== OPAL_UNSUPPORTED) { |
|
pr_emerg("Reboot type %d not supported for %s\n", |
|
OPAL_REBOOT_PLATFORM_ERROR, msg); |
|
} |
|
|
|
/* |
|
* We reached here. There can be three possibilities: |
|
* 1. We are running on a firmware level that do not support |
|
* opal_cec_reboot2() |
|
* 2. We are running on a firmware level that do not support |
|
* OPAL_REBOOT_PLATFORM_ERROR reboot type. |
|
* 3. We are running on FSP based system that does not need |
|
* opal to trigger checkstop explicitly for error analysis. |
|
* The FSP PRD component would have already got notified |
|
* about this error through other channels. |
|
* 4. We are running on a newer skiboot that by default does |
|
* not cause a checkstop, drops us back to the kernel to |
|
* extract context and state at the time of the error. |
|
*/ |
|
|
|
panic(msg); |
|
} |
|
|
|
int opal_machine_check(struct pt_regs *regs) |
|
{ |
|
struct machine_check_event evt; |
|
|
|
if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
|
return 0; |
|
|
|
/* Print things out */ |
|
if (evt.version != MCE_V1) { |
|
pr_err("Machine Check Exception, Unknown event version %d !\n", |
|
evt.version); |
|
return 0; |
|
} |
|
machine_check_print_event_info(&evt, user_mode(regs), false); |
|
|
|
if (opal_recover_mce(regs, &evt)) |
|
return 1; |
|
|
|
pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); |
|
} |
|
|
|
/* Early hmi handler called in real mode. */ |
|
int opal_hmi_exception_early(struct pt_regs *regs) |
|
{ |
|
s64 rc; |
|
|
|
/* |
|
* call opal hmi handler. Pass paca address as token. |
|
* The return value OPAL_SUCCESS is an indication that there is |
|
* an HMI event generated waiting to pull by Linux. |
|
*/ |
|
rc = opal_handle_hmi(); |
|
if (rc == OPAL_SUCCESS) { |
|
local_paca->hmi_event_available = 1; |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
int opal_hmi_exception_early2(struct pt_regs *regs) |
|
{ |
|
s64 rc; |
|
__be64 out_flags; |
|
|
|
/* |
|
* call opal hmi handler. |
|
* Check 64-bit flag mask to find out if an event was generated, |
|
* and whether TB is still valid or not etc. |
|
*/ |
|
rc = opal_handle_hmi2(&out_flags); |
|
if (rc != OPAL_SUCCESS) |
|
return 0; |
|
|
|
if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) |
|
local_paca->hmi_event_available = 1; |
|
if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) |
|
tb_invalid = true; |
|
return 1; |
|
} |
|
|
|
/* HMI exception handler called in virtual mode when irqs are next enabled. */ |
|
int opal_handle_hmi_exception(struct pt_regs *regs) |
|
{ |
|
/* |
|
* Check if HMI event is available. |
|
* if Yes, then wake kopald to process them. |
|
*/ |
|
if (!local_paca->hmi_event_available) |
|
return 0; |
|
|
|
local_paca->hmi_event_available = 0; |
|
opal_wake_poller(); |
|
|
|
return 1; |
|
} |
|
|
|
static uint64_t find_recovery_address(uint64_t nip) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < mc_recoverable_range_len; i++) |
|
if ((nip >= mc_recoverable_range[i].start_addr) && |
|
(nip < mc_recoverable_range[i].end_addr)) |
|
return mc_recoverable_range[i].recover_addr; |
|
return 0; |
|
} |
|
|
|
bool opal_mce_check_early_recovery(struct pt_regs *regs) |
|
{ |
|
uint64_t recover_addr = 0; |
|
|
|
if (!opal.base || !opal.size) |
|
goto out; |
|
|
|
if ((regs->nip >= opal.base) && |
|
(regs->nip < (opal.base + opal.size))) |
|
recover_addr = find_recovery_address(regs->nip); |
|
|
|
/* |
|
* Setup regs->nip to rfi into fixup address. |
|
*/ |
|
if (recover_addr) |
|
regs_set_return_ip(regs, recover_addr); |
|
|
|
out: |
|
return !!recover_addr; |
|
} |
|
|
|
static int opal_sysfs_init(void) |
|
{ |
|
opal_kobj = kobject_create_and_add("opal", firmware_kobj); |
|
if (!opal_kobj) { |
|
pr_warn("kobject_create_and_add opal failed\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
|
struct bin_attribute *bin_attr, char *buf, |
|
loff_t off, size_t count) |
|
{ |
|
return memory_read_from_buffer(buf, count, &off, bin_attr->private, |
|
bin_attr->size); |
|
} |
|
|
|
static int opal_add_one_export(struct kobject *parent, const char *export_name, |
|
struct device_node *np, const char *prop_name) |
|
{ |
|
struct bin_attribute *attr = NULL; |
|
const char *name = NULL; |
|
u64 vals[2]; |
|
int rc; |
|
|
|
rc = of_property_read_u64_array(np, prop_name, &vals[0], 2); |
|
if (rc) |
|
goto out; |
|
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
|
if (!attr) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
name = kstrdup(export_name, GFP_KERNEL); |
|
if (!name) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
sysfs_bin_attr_init(attr); |
|
attr->attr.name = name; |
|
attr->attr.mode = 0400; |
|
attr->read = export_attr_read; |
|
attr->private = __va(vals[0]); |
|
attr->size = vals[1]; |
|
|
|
rc = sysfs_create_bin_file(parent, attr); |
|
out: |
|
if (rc) { |
|
kfree(name); |
|
kfree(attr); |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
static void opal_add_exported_attrs(struct device_node *np, |
|
struct kobject *kobj) |
|
{ |
|
struct device_node *child; |
|
struct property *prop; |
|
|
|
for_each_property_of_node(np, prop) { |
|
int rc; |
|
|
|
if (!strcmp(prop->name, "name") || |
|
!strcmp(prop->name, "phandle")) |
|
continue; |
|
|
|
rc = opal_add_one_export(kobj, prop->name, np, prop->name); |
|
if (rc) { |
|
pr_warn("Unable to add export %pOF/%s, rc = %d!\n", |
|
np, prop->name, rc); |
|
} |
|
} |
|
|
|
for_each_child_of_node(np, child) { |
|
struct kobject *child_kobj; |
|
|
|
child_kobj = kobject_create_and_add(child->name, kobj); |
|
if (!child_kobj) { |
|
pr_err("Unable to create export dir for %pOF\n", child); |
|
continue; |
|
} |
|
|
|
opal_add_exported_attrs(child, child_kobj); |
|
} |
|
} |
|
|
|
/* |
|
* opal_export_attrs: creates a sysfs node for each property listed in |
|
* the device-tree under /ibm,opal/firmware/exports/ |
|
* All new sysfs nodes are created under /opal/exports/. |
|
* This allows for reserved memory regions (e.g. HDAT) to be read. |
|
* The new sysfs nodes are only readable by root. |
|
*/ |
|
static void opal_export_attrs(void) |
|
{ |
|
struct device_node *np; |
|
struct kobject *kobj; |
|
int rc; |
|
|
|
np = of_find_node_by_path("/ibm,opal/firmware/exports"); |
|
if (!np) |
|
return; |
|
|
|
/* Create new 'exports' directory - /sys/firmware/opal/exports */ |
|
kobj = kobject_create_and_add("exports", opal_kobj); |
|
if (!kobj) { |
|
pr_warn("kobject_create_and_add() of exports failed\n"); |
|
return; |
|
} |
|
|
|
opal_add_exported_attrs(np, kobj); |
|
|
|
/* |
|
* NB: symbol_map existed before the generic export interface so it |
|
* lives under the top level opal_kobj. |
|
*/ |
|
rc = opal_add_one_export(opal_kobj, "symbol_map", |
|
np->parent, "symbol-map"); |
|
if (rc) |
|
pr_warn("Error %d creating OPAL symbols file\n", rc); |
|
|
|
of_node_put(np); |
|
} |
|
|
|
static void __init opal_dump_region_init(void) |
|
{ |
|
void *addr; |
|
uint64_t size; |
|
int rc; |
|
|
|
if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
|
return; |
|
|
|
/* Register kernel log buffer */ |
|
addr = log_buf_addr_get(); |
|
if (addr == NULL) |
|
return; |
|
|
|
size = log_buf_len_get(); |
|
if (size == 0) |
|
return; |
|
|
|
rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
|
__pa(addr), size); |
|
/* Don't warn if this is just an older OPAL that doesn't |
|
* know about that call |
|
*/ |
|
if (rc && rc != OPAL_UNSUPPORTED) |
|
pr_warn("DUMP: Failed to register kernel log buffer. " |
|
"rc = %d\n", rc); |
|
} |
|
|
|
static void opal_pdev_init(const char *compatible) |
|
{ |
|
struct device_node *np; |
|
|
|
for_each_compatible_node(np, NULL, compatible) |
|
of_platform_device_create(np, NULL, NULL); |
|
} |
|
|
|
static void __init opal_imc_init_dev(void) |
|
{ |
|
struct device_node *np; |
|
|
|
np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); |
|
if (np) |
|
of_platform_device_create(np, NULL, NULL); |
|
} |
|
|
|
static int kopald(void *unused) |
|
{ |
|
unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
|
|
|
set_freezable(); |
|
do { |
|
try_to_freeze(); |
|
|
|
opal_handle_events(); |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
if (opal_have_pending_events()) |
|
__set_current_state(TASK_RUNNING); |
|
else |
|
schedule_timeout(timeout); |
|
|
|
} while (!kthread_should_stop()); |
|
|
|
return 0; |
|
} |
|
|
|
void opal_wake_poller(void) |
|
{ |
|
if (kopald_tsk) |
|
wake_up_process(kopald_tsk); |
|
} |
|
|
|
static void opal_init_heartbeat(void) |
|
{ |
|
/* Old firwmware, we assume the HVC heartbeat is sufficient */ |
|
if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", |
|
&opal_heartbeat) != 0) |
|
opal_heartbeat = 0; |
|
|
|
if (opal_heartbeat) |
|
kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
|
} |
|
|
|
static int __init opal_init(void) |
|
{ |
|
struct device_node *np, *consoles, *leds; |
|
int rc; |
|
|
|
opal_node = of_find_node_by_path("/ibm,opal"); |
|
if (!opal_node) { |
|
pr_warn("Device node not found\n"); |
|
return -ENODEV; |
|
} |
|
|
|
/* Register OPAL consoles if any ports */ |
|
consoles = of_find_node_by_path("/ibm,opal/consoles"); |
|
if (consoles) { |
|
for_each_child_of_node(consoles, np) { |
|
if (!of_node_name_eq(np, "serial")) |
|
continue; |
|
of_platform_device_create(np, NULL, NULL); |
|
} |
|
of_node_put(consoles); |
|
} |
|
|
|
/* Initialise OPAL messaging system */ |
|
opal_message_init(opal_node); |
|
|
|
/* Initialise OPAL asynchronous completion interface */ |
|
opal_async_comp_init(); |
|
|
|
/* Initialise OPAL sensor interface */ |
|
opal_sensor_init(); |
|
|
|
/* Initialise OPAL hypervisor maintainence interrupt handling */ |
|
opal_hmi_handler_init(); |
|
|
|
/* Create i2c platform devices */ |
|
opal_pdev_init("ibm,opal-i2c"); |
|
|
|
/* Handle non-volatile memory devices */ |
|
opal_pdev_init("pmem-region"); |
|
|
|
/* Setup a heatbeat thread if requested by OPAL */ |
|
opal_init_heartbeat(); |
|
|
|
/* Detect In-Memory Collection counters and create devices*/ |
|
opal_imc_init_dev(); |
|
|
|
/* Create leds platform devices */ |
|
leds = of_find_node_by_path("/ibm,opal/leds"); |
|
if (leds) { |
|
of_platform_device_create(leds, "opal_leds", NULL); |
|
of_node_put(leds); |
|
} |
|
|
|
/* Initialise OPAL message log interface */ |
|
opal_msglog_init(); |
|
|
|
/* Create "opal" kobject under /sys/firmware */ |
|
rc = opal_sysfs_init(); |
|
if (rc == 0) { |
|
/* Setup dump region interface */ |
|
opal_dump_region_init(); |
|
/* Setup error log interface */ |
|
rc = opal_elog_init(); |
|
/* Setup code update interface */ |
|
opal_flash_update_init(); |
|
/* Setup platform dump extract interface */ |
|
opal_platform_dump_init(); |
|
/* Setup system parameters interface */ |
|
opal_sys_param_init(); |
|
/* Setup message log sysfs interface. */ |
|
opal_msglog_sysfs_init(); |
|
/* Add all export properties*/ |
|
opal_export_attrs(); |
|
} |
|
|
|
/* Initialize platform devices: IPMI backend, PRD & flash interface */ |
|
opal_pdev_init("ibm,opal-ipmi"); |
|
opal_pdev_init("ibm,opal-flash"); |
|
opal_pdev_init("ibm,opal-prd"); |
|
|
|
/* Initialise platform device: oppanel interface */ |
|
opal_pdev_init("ibm,opal-oppanel"); |
|
|
|
/* Initialise OPAL kmsg dumper for flushing console on panic */ |
|
opal_kmsg_init(); |
|
|
|
/* Initialise OPAL powercap interface */ |
|
opal_powercap_init(); |
|
|
|
/* Initialise OPAL Power-Shifting-Ratio interface */ |
|
opal_psr_init(); |
|
|
|
/* Initialise OPAL sensor groups */ |
|
opal_sensor_groups_init(); |
|
|
|
/* Initialise OPAL Power control interface */ |
|
opal_power_control_init(); |
|
|
|
/* Initialize OPAL secure variables */ |
|
opal_pdev_init("ibm,secvar-backend"); |
|
|
|
return 0; |
|
} |
|
machine_subsys_initcall(powernv, opal_init); |
|
|
|
void opal_shutdown(void) |
|
{ |
|
long rc = OPAL_BUSY; |
|
|
|
opal_event_shutdown(); |
|
|
|
/* |
|
* Then sync with OPAL which ensure anything that can |
|
* potentially write to our memory has completed such |
|
* as an ongoing dump retrieval |
|
*/ |
|
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { |
|
rc = opal_sync_host_reboot(); |
|
if (rc == OPAL_BUSY) |
|
opal_poll_events(NULL); |
|
else |
|
mdelay(10); |
|
} |
|
|
|
/* Unregister memory dump region */ |
|
if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
|
opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); |
|
} |
|
|
|
/* Export this so that test modules can use it */ |
|
EXPORT_SYMBOL_GPL(opal_invalid_call); |
|
EXPORT_SYMBOL_GPL(opal_xscom_read); |
|
EXPORT_SYMBOL_GPL(opal_xscom_write); |
|
EXPORT_SYMBOL_GPL(opal_ipmi_send); |
|
EXPORT_SYMBOL_GPL(opal_ipmi_recv); |
|
EXPORT_SYMBOL_GPL(opal_flash_read); |
|
EXPORT_SYMBOL_GPL(opal_flash_write); |
|
EXPORT_SYMBOL_GPL(opal_flash_erase); |
|
EXPORT_SYMBOL_GPL(opal_prd_msg); |
|
EXPORT_SYMBOL_GPL(opal_check_token); |
|
|
|
/* Convert a region of vmalloc memory to an opal sg list */ |
|
struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, |
|
unsigned long vmalloc_size) |
|
{ |
|
struct opal_sg_list *sg, *first = NULL; |
|
unsigned long i = 0; |
|
|
|
sg = kzalloc(PAGE_SIZE, GFP_KERNEL); |
|
if (!sg) |
|
goto nomem; |
|
|
|
first = sg; |
|
|
|
while (vmalloc_size > 0) { |
|
uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; |
|
uint64_t length = min(vmalloc_size, PAGE_SIZE); |
|
|
|
sg->entry[i].data = cpu_to_be64(data); |
|
sg->entry[i].length = cpu_to_be64(length); |
|
i++; |
|
|
|
if (i >= SG_ENTRIES_PER_NODE) { |
|
struct opal_sg_list *next; |
|
|
|
next = kzalloc(PAGE_SIZE, GFP_KERNEL); |
|
if (!next) |
|
goto nomem; |
|
|
|
sg->length = cpu_to_be64( |
|
i * sizeof(struct opal_sg_entry) + 16); |
|
i = 0; |
|
sg->next = cpu_to_be64(__pa(next)); |
|
sg = next; |
|
} |
|
|
|
vmalloc_addr += length; |
|
vmalloc_size -= length; |
|
} |
|
|
|
sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); |
|
|
|
return first; |
|
|
|
nomem: |
|
pr_err("%s : Failed to allocate memory\n", __func__); |
|
opal_free_sg_list(first); |
|
return NULL; |
|
} |
|
|
|
void opal_free_sg_list(struct opal_sg_list *sg) |
|
{ |
|
while (sg) { |
|
uint64_t next = be64_to_cpu(sg->next); |
|
|
|
kfree(sg); |
|
|
|
if (next) |
|
sg = __va(next); |
|
else |
|
sg = NULL; |
|
} |
|
} |
|
|
|
int opal_error_code(int rc) |
|
{ |
|
switch (rc) { |
|
case OPAL_SUCCESS: return 0; |
|
|
|
case OPAL_PARAMETER: return -EINVAL; |
|
case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; |
|
case OPAL_BUSY: |
|
case OPAL_BUSY_EVENT: return -EBUSY; |
|
case OPAL_NO_MEM: return -ENOMEM; |
|
case OPAL_PERMISSION: return -EPERM; |
|
|
|
case OPAL_UNSUPPORTED: return -EIO; |
|
case OPAL_HARDWARE: return -EIO; |
|
case OPAL_INTERNAL_ERROR: return -EIO; |
|
case OPAL_TIMEOUT: return -ETIMEDOUT; |
|
default: |
|
pr_err("%s: unexpected OPAL error %d\n", __func__, rc); |
|
return -EIO; |
|
} |
|
} |
|
|
|
void powernv_set_nmmu_ptcr(unsigned long ptcr) |
|
{ |
|
int rc; |
|
|
|
if (firmware_has_feature(FW_FEATURE_OPAL)) { |
|
rc = opal_nmmu_set_ptcr(-1UL, ptcr); |
|
if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) |
|
pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); |
|
} |
|
} |
|
|
|
EXPORT_SYMBOL_GPL(opal_poll_events); |
|
EXPORT_SYMBOL_GPL(opal_rtc_read); |
|
EXPORT_SYMBOL_GPL(opal_rtc_write); |
|
EXPORT_SYMBOL_GPL(opal_tpo_read); |
|
EXPORT_SYMBOL_GPL(opal_tpo_write); |
|
EXPORT_SYMBOL_GPL(opal_i2c_request); |
|
/* Export these symbols for PowerNV LED class driver */ |
|
EXPORT_SYMBOL_GPL(opal_leds_get_ind); |
|
EXPORT_SYMBOL_GPL(opal_leds_set_ind); |
|
/* Export this symbol for PowerNV Operator Panel class driver */ |
|
EXPORT_SYMBOL_GPL(opal_write_oppanel_async); |
|
/* Export this for KVM */ |
|
EXPORT_SYMBOL_GPL(opal_int_set_mfrr); |
|
EXPORT_SYMBOL_GPL(opal_int_eoi); |
|
EXPORT_SYMBOL_GPL(opal_error_code); |
|
/* Export the below symbol for NX compression */ |
|
EXPORT_SYMBOL(opal_nx_coproc_init);
|
|
|