powerpc/powernv: Add OPAL message log interface
OPAL provides an in-memory circular buffer containing a message log populated with various runtime messages produced by the firmware. Provide a sysfs interface /sys/firmware/opal/msglog for userspace to view the messages. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -730,6 +730,9 @@ typedef struct oppanel_line {
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/* /sys/firmware/opal */
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extern struct kobject *opal_kobj;
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/* /ibm,opal */
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extern struct device_node *opal_node;
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/* API functions */
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int64_t opal_console_write(int64_t term_number, __be64 *length,
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const uint8_t *buffer);
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@ -920,6 +923,7 @@ extern void opal_flash_init(void);
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extern int opal_elog_init(void);
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extern void opal_platform_dump_init(void);
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extern void opal_sys_param_init(void);
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extern void opal_msglog_init(void);
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extern int opal_machine_check(struct pt_regs *regs);
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extern bool opal_mce_check_early_recovery(struct pt_regs *regs);
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@ -1,6 +1,7 @@
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obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o
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obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
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obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
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obj-y += opal-msglog.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
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120
arch/powerpc/platforms/powernv/opal-msglog.c
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120
arch/powerpc/platforms/powernv/opal-msglog.c
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@ -0,0 +1,120 @@
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/*
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* PowerNV OPAL in-memory console interface
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*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/io.h>
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#include <asm/opal.h>
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#include <linux/debugfs.h>
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#include <linux/of.h>
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#include <linux/types.h>
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#include <asm/barrier.h>
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/* OPAL in-memory console. Defined in OPAL source at core/console.c */
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struct memcons {
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__be64 magic;
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#define MEMCONS_MAGIC 0x6630696567726173L
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__be64 obuf_phys;
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__be64 ibuf_phys;
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__be32 obuf_size;
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__be32 ibuf_size;
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__be32 out_pos;
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#define MEMCONS_OUT_POS_WRAP 0x80000000u
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#define MEMCONS_OUT_POS_MASK 0x00ffffffu
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__be32 in_prod;
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__be32 in_cons;
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};
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static ssize_t opal_msglog_read(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *to,
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loff_t pos, size_t count)
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{
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struct memcons *mc = bin_attr->private;
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const char *conbuf;
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size_t ret, first_read = 0;
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uint32_t out_pos, avail;
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if (!mc)
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return -ENODEV;
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out_pos = be32_to_cpu(ACCESS_ONCE(mc->out_pos));
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/* Now we've read out_pos, put a barrier in before reading the new
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* data it points to in conbuf. */
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smp_rmb();
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conbuf = phys_to_virt(be64_to_cpu(mc->obuf_phys));
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/* When the buffer has wrapped, read from the out_pos marker to the end
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* of the buffer, and then read the remaining data as in the un-wrapped
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* case. */
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if (out_pos & MEMCONS_OUT_POS_WRAP) {
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out_pos &= MEMCONS_OUT_POS_MASK;
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avail = be32_to_cpu(mc->obuf_size) - out_pos;
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ret = memory_read_from_buffer(to, count, &pos,
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conbuf + out_pos, avail);
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if (ret < 0)
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goto out;
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first_read = ret;
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to += first_read;
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count -= first_read;
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pos -= avail;
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}
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/* Sanity check. The firmware should not do this to us. */
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if (out_pos > be32_to_cpu(mc->obuf_size)) {
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pr_err("OPAL: memory console corruption. Aborting read.\n");
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return -EINVAL;
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}
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ret = memory_read_from_buffer(to, count, &pos, conbuf, out_pos);
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if (ret < 0)
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goto out;
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ret += first_read;
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out:
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return ret;
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}
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static struct bin_attribute opal_msglog_attr = {
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.attr = {.name = "msglog", .mode = 0444},
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.read = opal_msglog_read
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};
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void __init opal_msglog_init(void)
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{
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u64 mcaddr;
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struct memcons *mc;
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if (of_property_read_u64(opal_node, "ibm,opal-memcons", &mcaddr)) {
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pr_warn("OPAL: Property ibm,opal-memcons not found, no message log\n");
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return;
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}
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mc = phys_to_virt(mcaddr);
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if (!mc) {
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pr_warn("OPAL: memory console address is invalid\n");
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return;
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}
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if (be64_to_cpu(mc->magic) != MEMCONS_MAGIC) {
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pr_warn("OPAL: memory console version is invalid\n");
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return;
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}
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opal_msglog_attr.private = mc;
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if (sysfs_create_bin_file(opal_kobj, &opal_msglog_attr) != 0)
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pr_warn("OPAL: sysfs file creation failed\n");
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}
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@ -46,7 +46,7 @@ struct mcheck_recoverable_range {
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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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static struct device_node *opal_node;
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struct device_node *opal_node;
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static DEFINE_SPINLOCK(opal_write_lock);
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extern u64 opal_mc_secondary_handler[];
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static unsigned int *opal_irqs;
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@ -602,6 +602,8 @@ static int __init opal_init(void)
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opal_platform_dump_init();
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/* Setup system parameters interface */
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opal_sys_param_init();
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/* Setup message log interface. */
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opal_msglog_init();
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}
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return 0;
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