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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PowerNV OPAL in-memory console interface
*
* Copyright 2014 IBM Corp.
*/
#include <asm/io.h>
#include <asm/opal.h>
#include <linux/debugfs.h>
#include <linux/of.h>
#include <linux/types.h>
#include <asm/barrier.h>
/* OPAL in-memory console. Defined in OPAL source at core/console.c */
struct memcons {
__be64 magic;
#define MEMCONS_MAGIC 0x6630696567726173L
__be64 obuf_phys;
__be64 ibuf_phys;
__be32 obuf_size;
__be32 ibuf_size;
__be32 out_pos;
#define MEMCONS_OUT_POS_WRAP 0x80000000u
#define MEMCONS_OUT_POS_MASK 0x00ffffffu
__be32 in_prod;
__be32 in_cons;
};
static struct memcons *opal_memcons = NULL;
ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
{
const char *conbuf;
ssize_t ret;
size_t first_read = 0;
uint32_t out_pos, avail;
if (!opal_memcons)
return -ENODEV;
out_pos = be32_to_cpu(READ_ONCE(opal_memcons->out_pos));
/* Now we've read out_pos, put a barrier in before reading the new
* data it points to in conbuf. */
smp_rmb();
conbuf = phys_to_virt(be64_to_cpu(opal_memcons->obuf_phys));
/* When the buffer has wrapped, read from the out_pos marker to the end
* of the buffer, and then read the remaining data as in the un-wrapped
* case. */
if (out_pos & MEMCONS_OUT_POS_WRAP) {
out_pos &= MEMCONS_OUT_POS_MASK;
avail = be32_to_cpu(opal_memcons->obuf_size) - out_pos;
ret = memory_read_from_buffer(to, count, &pos,
conbuf + out_pos, avail);
if (ret < 0)
goto out;
first_read = ret;
to += first_read;
count -= first_read;
pos -= avail;
if (count <= 0)
goto out;
}
/* Sanity check. The firmware should not do this to us. */
if (out_pos > be32_to_cpu(opal_memcons->obuf_size)) {
pr_err("OPAL: memory console corruption. Aborting read.\n");
return -EINVAL;
}
ret = memory_read_from_buffer(to, count, &pos, conbuf, out_pos);
if (ret < 0)
goto out;
ret += first_read;
out:
return ret;
}
static ssize_t opal_msglog_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr, char *to,
loff_t pos, size_t count)
{
return opal_msglog_copy(to, pos, count);
}
static struct bin_attribute opal_msglog_attr = {
.attr = {.name = "msglog", .mode = 0400},
.read = opal_msglog_read
};
void __init opal_msglog_init(void)
{
u64 mcaddr;
struct memcons *mc;
if (of_property_read_u64(opal_node, "ibm,opal-memcons", &mcaddr)) {
pr_warn("OPAL: Property ibm,opal-memcons not found, no message log\n");
return;
}
mc = phys_to_virt(mcaddr);
if (!mc) {
pr_warn("OPAL: memory console address is invalid\n");
return;
}
if (be64_to_cpu(mc->magic) != MEMCONS_MAGIC) {
pr_warn("OPAL: memory console version is invalid\n");
return;
}
/* Report maximum size */
opal_msglog_attr.size = be32_to_cpu(mc->ibuf_size) +
be32_to_cpu(mc->obuf_size);
opal_memcons = mc;
}
void __init opal_msglog_sysfs_init(void)
{
if (!opal_memcons) {
pr_warn("OPAL: message log initialisation failed, not creating sysfs entry\n");
return;
}
if (sysfs_create_bin_file(opal_kobj, &opal_msglog_attr) != 0)
pr_warn("OPAL: sysfs file creation failed\n");
}
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