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-rw-r--r--arch/powerpc/platforms/powernv/opal.c1118
1 files changed, 1118 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
new file mode 100644
index 000000000..edf9032e2
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -0,0 +1,1118 @@
+/*
+ * PowerNV OPAL high level interfaces
+ *
+ * Copyright 2011 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "opal: " fmt
+
+#include <linux/printk.h>
+#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/kobject.h>
+#include <linux/delay.h>
+#include <linux/memblock.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/printk.h>
+#include <linux/kmsg_dump.h>
+#include <linux/console.h>
+#include <linux/sched/debug.h>
+
+#include <asm/machdep.h>
+#include <asm/opal.h>
+#include <asm/firmware.h>
+#include <asm/mce.h>
+#include <asm/imc-pmu.h>
+#include <asm/bug.h>
+
+#include "powernv.h"
+
+/* /sys/firmware/opal */
+struct kobject *opal_kobj;
+
+struct opal {
+ u64 base;
+ u64 entry;
+ u64 size;
+} opal;
+
+struct mcheck_recoverable_range {
+ u64 start_addr;
+ u64 end_addr;
+ u64 recover_addr;
+};
+
+static struct mcheck_recoverable_range *mc_recoverable_range;
+static int mc_recoverable_range_len;
+
+struct device_node *opal_node;
+static DEFINE_SPINLOCK(opal_write_lock);
+static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
+static uint32_t opal_heartbeat;
+static struct task_struct *kopald_tsk;
+
+void opal_configure_cores(void)
+{
+ u64 reinit_flags = 0;
+
+ /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
+ *
+ * It will preserve non volatile GPRs and HSPRG0/1. It will
+ * also restore HIDs and other SPRs to their original value
+ * but it might clobber a bunch.
+ */
+#ifdef __BIG_ENDIAN__
+ reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
+#else
+ reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
+#endif
+
+ /*
+ * POWER9 always support running hash:
+ * ie. Host hash supports hash guests
+ * Host radix supports hash/radix guests
+ */
+ if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
+ reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
+ if (early_radix_enabled())
+ reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
+ }
+
+ opal_reinit_cpus(reinit_flags);
+
+ /* Restore some bits */
+ if (cur_cpu_spec->cpu_restore)
+ cur_cpu_spec->cpu_restore();
+}
+
+int __init early_init_dt_scan_opal(unsigned long node,
+ const char *uname, int depth, void *data)
+{
+ const void *basep, *entryp, *sizep;
+ int basesz, entrysz, runtimesz;
+
+ if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
+ return 0;
+
+ basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
+ entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
+ sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
+
+ if (!basep || !entryp || !sizep)
+ return 1;
+
+ opal.base = of_read_number(basep, basesz/4);
+ opal.entry = of_read_number(entryp, entrysz/4);
+ opal.size = of_read_number(sizep, runtimesz/4);
+
+ pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
+ opal.base, basep, basesz);
+ pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
+ opal.entry, entryp, entrysz);
+ pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
+ opal.size, sizep, runtimesz);
+
+ if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
+ powerpc_firmware_features |= FW_FEATURE_OPAL;
+ pr_debug("OPAL detected !\n");
+ } else {
+ panic("OPAL != V3 detected, no longer supported.\n");
+ }
+
+ return 1;
+}
+
+int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
+ const char *uname, int depth, void *data)
+{
+ int i, psize, size;
+ const __be32 *prop;
+
+ if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
+ return 0;
+
+ prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
+
+ if (!prop)
+ return 1;
+
+ pr_debug("Found machine check recoverable ranges.\n");
+
+ /*
+ * Calculate number of available entries.
+ *
+ * Each recoverable address range entry is (start address, len,
+ * recovery address), 2 cells each for start and recovery address,
+ * 1 cell for len, totalling 5 cells per entry.
+ */
+ mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
+
+ /* Sanity check */
+ if (!mc_recoverable_range_len)
+ return 1;
+
+ /* Size required to hold all the entries. */
+ size = mc_recoverable_range_len *
+ sizeof(struct mcheck_recoverable_range);
+
+ /*
+ * Allocate a buffer to hold the MC recoverable ranges.
+ */
+ mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64)));
+ memset(mc_recoverable_range, 0, size);
+
+ for (i = 0; i < mc_recoverable_range_len; i++) {
+ mc_recoverable_range[i].start_addr =
+ of_read_number(prop + (i * 5) + 0, 2);
+ mc_recoverable_range[i].end_addr =
+ mc_recoverable_range[i].start_addr +
+ of_read_number(prop + (i * 5) + 2, 1);
+ mc_recoverable_range[i].recover_addr =
+ of_read_number(prop + (i * 5) + 3, 2);
+
+ pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
+ mc_recoverable_range[i].start_addr,
+ mc_recoverable_range[i].end_addr,
+ mc_recoverable_range[i].recover_addr);
+ }
+ return 1;
+}
+
+static int __init opal_register_exception_handlers(void)
+{
+#ifdef __BIG_ENDIAN__
+ u64 glue;
+
+ if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
+ return -ENODEV;
+
+ /* Hookup some exception handlers except machine check. We use the
+ * fwnmi area at 0x7000 to provide the glue space to OPAL
+ */
+ glue = 0x7000;
+
+ /*
+ * Check if we are running on newer firmware that exports
+ * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
+ * the HMI interrupt and we catch it directly in Linux.
+ *
+ * For older firmware (i.e currently released POWER8 System Firmware
+ * as of today <= SV810_087), we fallback to old behavior and let OPAL
+ * patch the HMI vector and handle it inside OPAL firmware.
+ *
+ * For newer firmware (in development/yet to be released) we will
+ * start catching/handling HMI directly in Linux.
+ */
+ if (!opal_check_token(OPAL_HANDLE_HMI)) {
+ pr_info("Old firmware detected, OPAL handles HMIs.\n");
+ opal_register_exception_handler(
+ OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
+ 0, glue);
+ glue += 128;
+ }
+
+ opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
+#endif
+
+ return 0;
+}
+machine_early_initcall(powernv, opal_register_exception_handlers);
+
+/*
+ * Opal message notifier based on message type. Allow subscribers to get
+ * notified for specific messgae type.
+ */
+int opal_message_notifier_register(enum opal_msg_type msg_type,
+ struct notifier_block *nb)
+{
+ if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
+ pr_warn("%s: Invalid arguments, msg_type:%d\n",
+ __func__, msg_type);
+ return -EINVAL;
+ }
+
+ return atomic_notifier_chain_register(
+ &opal_msg_notifier_head[msg_type], nb);
+}
+EXPORT_SYMBOL_GPL(opal_message_notifier_register);
+
+int opal_message_notifier_unregister(enum opal_msg_type msg_type,
+ struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(
+ &opal_msg_notifier_head[msg_type], nb);
+}
+EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
+
+static void opal_message_do_notify(uint32_t msg_type, void *msg)
+{
+ /* notify subscribers */
+ atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
+ msg_type, msg);
+}
+
+static void opal_handle_message(void)
+{
+ s64 ret;
+ /*
+ * TODO: pre-allocate a message buffer depending on opal-msg-size
+ * value in /proc/device-tree.
+ */
+ static struct opal_msg msg;
+ u32 type;
+
+ ret = opal_get_msg(__pa(&msg), sizeof(msg));
+ /* No opal message pending. */
+ if (ret == OPAL_RESOURCE)
+ return;
+
+ /* check for errors. */
+ if (ret) {
+ pr_warn("%s: Failed to retrieve opal message, err=%lld\n",
+ __func__, ret);
+ return;
+ }
+
+ type = be32_to_cpu(msg.msg_type);
+
+ /* Sanity check */
+ if (type >= OPAL_MSG_TYPE_MAX) {
+ pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
+ return;
+ }
+ opal_message_do_notify(type, (void *)&msg);
+}
+
+static irqreturn_t opal_message_notify(int irq, void *data)
+{
+ opal_handle_message();
+ return IRQ_HANDLED;
+}
+
+static int __init opal_message_init(void)
+{
+ int ret, i, irq;
+
+ for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
+ ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
+
+ irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
+ if (!irq) {
+ pr_err("%s: Can't register OPAL event irq (%d)\n",
+ __func__, irq);
+ return irq;
+ }
+
+ ret = request_irq(irq, opal_message_notify,
+ IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
+ if (ret) {
+ pr_err("%s: Can't request OPAL event irq (%d)\n",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+int opal_get_chars(uint32_t vtermno, char *buf, int count)
+{
+ s64 rc;
+ __be64 evt, len;
+
+ if (!opal.entry)
+ return -ENODEV;
+ opal_poll_events(&evt);
+ if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
+ return 0;
+ len = cpu_to_be64(count);
+ rc = opal_console_read(vtermno, &len, buf);
+ if (rc == OPAL_SUCCESS)
+ return be64_to_cpu(len);
+ return 0;
+}
+
+static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic)
+{
+ unsigned long flags = 0 /* shut up gcc */;
+ int written;
+ __be64 olen;
+ s64 rc;
+
+ if (!opal.entry)
+ return -ENODEV;
+
+ if (atomic)
+ spin_lock_irqsave(&opal_write_lock, flags);
+ rc = opal_console_write_buffer_space(vtermno, &olen);
+ if (rc || be64_to_cpu(olen) < total_len) {
+ /* Closed -> drop characters */
+ if (rc)
+ written = total_len;
+ else
+ written = -EAGAIN;
+ goto out;
+ }
+
+ /* Should not get a partial write here because space is available. */
+ olen = cpu_to_be64(total_len);
+ rc = opal_console_write(vtermno, &olen, data);
+ if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+ if (rc == OPAL_BUSY_EVENT)
+ opal_poll_events(NULL);
+ written = -EAGAIN;
+ goto out;
+ }
+
+ /* Closed or other error drop */
+ if (rc != OPAL_SUCCESS) {
+ written = opal_error_code(rc);
+ goto out;
+ }
+
+ written = be64_to_cpu(olen);
+ if (written < total_len) {
+ if (atomic) {
+ /* Should not happen */
+ pr_warn("atomic console write returned partial "
+ "len=%d written=%d\n", total_len, written);
+ }
+ if (!written)
+ written = -EAGAIN;
+ }
+
+out:
+ if (atomic)
+ spin_unlock_irqrestore(&opal_write_lock, flags);
+
+ return written;
+}
+
+int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
+{
+ return __opal_put_chars(vtermno, data, total_len, false);
+}
+
+/*
+ * opal_put_chars_atomic will not perform partial-writes. Data will be
+ * atomically written to the terminal or not at all. This is not strictly
+ * true at the moment because console space can race with OPAL's console
+ * writes.
+ */
+int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len)
+{
+ return __opal_put_chars(vtermno, data, total_len, true);
+}
+
+static s64 __opal_flush_console(uint32_t vtermno)
+{
+ s64 rc;
+
+ if (!opal_check_token(OPAL_CONSOLE_FLUSH)) {
+ __be64 evt;
+
+ /*
+ * If OPAL_CONSOLE_FLUSH is not implemented in the firmware,
+ * the console can still be flushed by calling the polling
+ * function while it has OPAL_EVENT_CONSOLE_OUTPUT events.
+ */
+ WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n");
+
+ opal_poll_events(&evt);
+ if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT))
+ return OPAL_SUCCESS;
+ return OPAL_BUSY;
+
+ } else {
+ rc = opal_console_flush(vtermno);
+ if (rc == OPAL_BUSY_EVENT) {
+ opal_poll_events(NULL);
+ rc = OPAL_BUSY;
+ }
+ return rc;
+ }
+
+}
+
+/*
+ * opal_flush_console spins until the console is flushed
+ */
+int opal_flush_console(uint32_t vtermno)
+{
+ for (;;) {
+ s64 rc = __opal_flush_console(vtermno);
+
+ if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) {
+ mdelay(1);
+ continue;
+ }
+
+ return opal_error_code(rc);
+ }
+}
+
+/*
+ * opal_flush_chars is an hvc interface that sleeps until the console is
+ * flushed if wait, otherwise it will return -EBUSY if the console has data,
+ * -EAGAIN if it has data and some of it was flushed.
+ */
+int opal_flush_chars(uint32_t vtermno, bool wait)
+{
+ for (;;) {
+ s64 rc = __opal_flush_console(vtermno);
+
+ if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) {
+ if (wait) {
+ msleep(OPAL_BUSY_DELAY_MS);
+ continue;
+ }
+ 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->msr & MSR_RI)) {
+ /* 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->severity == MCE_SEV_ERROR_SYNC) {
+ /*
+ * 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("Machine check", regs, SIGBUS);
+ recovered = 1;
+ }
+ }
+
+ return recovered;
+}
+
+void 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));
+
+ 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;
+}
+
+/* HMI exception handler called in virtual mode during check_irq_replay. */
+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->nip = 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 symbol_map_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 struct bin_attribute symbol_map_attr = {
+ .attr = {.name = "symbol_map", .mode = 0400},
+ .read = symbol_map_read
+};
+
+static void opal_export_symmap(void)
+{
+ const __be64 *syms;
+ unsigned int size;
+ struct device_node *fw;
+ int rc;
+
+ fw = of_find_node_by_path("/ibm,opal/firmware");
+ if (!fw)
+ return;
+ syms = of_get_property(fw, "symbol-map", &size);
+ if (!syms || size != 2 * sizeof(__be64))
+ return;
+
+ /* Setup attributes */
+ symbol_map_attr.private = __va(be64_to_cpu(syms[0]));
+ symbol_map_attr.size = be64_to_cpu(syms[1]);
+
+ rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr);
+ if (rc)
+ pr_warn("Error %d creating OPAL symbols file\n", rc);
+}
+
+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);
+}
+
+/*
+ * 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 bin_attribute *attr;
+ struct device_node *np;
+ struct property *prop;
+ struct kobject *kobj;
+ u64 vals[2];
+ 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;
+ }
+
+ for_each_property_of_node(np, prop) {
+ if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
+ continue;
+
+ if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
+ continue;
+
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+
+ if (attr == NULL) {
+ pr_warn("Failed kmalloc for bin_attribute!");
+ continue;
+ }
+
+ sysfs_bin_attr_init(attr);
+ attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
+ attr->attr.mode = 0400;
+ attr->read = export_attr_read;
+ attr->private = __va(vals[0]);
+ attr->size = vals[1];
+
+ if (attr->attr.name == NULL) {
+ pr_warn("Failed kstrdup for bin_attribute attr.name");
+ kfree(attr);
+ continue;
+ }
+
+ rc = sysfs_create_bin_file(kobj, attr);
+ if (rc) {
+ pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
+ rc, prop->name);
+ kfree(attr->attr.name);
+ kfree(attr);
+ }
+ }
+
+ 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 (strcmp(np->name, "serial"))
+ continue;
+ of_platform_device_create(np, NULL, NULL);
+ }
+ of_node_put(consoles);
+ }
+
+ /* Initialise OPAL messaging system */
+ opal_message_init();
+
+ /* 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) {
+ /* Export symbol map to userspace */
+ opal_export_symmap();
+ /* 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();
+ }
+
+ /* Export all 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();
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 02:58:53 +0000