This patch refactors the code in opal-msglog that operates on the OPAL
memory console in order to make it cleaner and also allow the reuse of
the new memcons_* functions.
Signed-off-by: Claudio Carvalho <cclau...@linux.ibm.com>
---
arch/powerpc/platforms/powernv/opal-msglog.c | 61 ++++++++++++++------
1 file changed, 42 insertions(+), 19 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/opal-msglog.c
b/arch/powerpc/platforms/powernv/opal-msglog.c
index dc51d03c6370..0e8eb62c8afe 100644
--- a/arch/powerpc/platforms/powernv/opal-msglog.c
+++ b/arch/powerpc/platforms/powernv/opal-msglog.c
@@ -29,23 +29,24 @@ struct memcons {
static struct memcons *opal_memcons = NULL;
-ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
+static ssize_t memcons_copy(struct memcons *mc, 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)
+ if (!mc)
return -ENODEV;
- out_pos = be32_to_cpu(READ_ONCE(opal_memcons->out_pos));
+ out_pos = be32_to_cpu(READ_ONCE(mc->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));
+ conbuf = phys_to_virt(be64_to_cpu(mc->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
@@ -53,7 +54,7 @@ ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
if (out_pos & MEMCONS_OUT_POS_WRAP) {
out_pos &= MEMCONS_OUT_POS_MASK;
- avail = be32_to_cpu(opal_memcons->obuf_size) - out_pos;
+ avail = be32_to_cpu(mc->obuf_size) - out_pos;
ret = memory_read_from_buffer(to, count, &pos,
conbuf + out_pos, avail);
@@ -71,7 +72,7 @@ ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
}
/* Sanity check. The firmware should not do this to us. */
- if (out_pos > be32_to_cpu(opal_memcons->obuf_size)) {
+ if (out_pos > be32_to_cpu(mc->obuf_size)) {
pr_err("OPAL: memory console corruption. Aborting read.\n");
return -EINVAL;
}
@@ -86,11 +87,16 @@ ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
return ret;
}
+ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
+{
+ return memcons_copy(opal_memcons, to, pos, count);
+}
+
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);
+ return memcons_copy(opal_memcons, to, pos, count);
}
static struct bin_attribute opal_msglog_attr = {
@@ -98,32 +104,49 @@ static struct bin_attribute opal_msglog_attr = {
.read = opal_msglog_read
};
-void __init opal_msglog_init(void)
+static struct memcons *memcons_load_from_dt(struct device_node *node,
+ const char *mc_prop_name)
{
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;
+ if (of_property_read_u64(node, mc_prop_name, &mcaddr)) {
+ pr_warn("%s property not found, no message log\n",
+ mc_prop_name);
+ goto out_err;
}
mc = phys_to_virt(mcaddr);
if (!mc) {
- pr_warn("OPAL: memory console address is invalid\n");
- return;
+ pr_warn("memory console address is invalid\n");
+ goto out_err;
}
if (be64_to_cpu(mc->magic) != MEMCONS_MAGIC) {
- pr_warn("OPAL: memory console version is invalid\n");
- return;
+ pr_warn("memory console version is invalid\n");
+ goto out_err;
}
- /* Report maximum size */
- opal_msglog_attr.size = be32_to_cpu(mc->ibuf_size) +
- be32_to_cpu(mc->obuf_size);
+ return mc;
+
+out_err:
+ return NULL;
+}
+
+static u32 memcons_get_size(struct memcons *mc)
+{
+ return be32_to_cpu(mc->ibuf_size) + be32_to_cpu(mc->obuf_size);
+}
+
+void __init opal_msglog_init(void)
+{
+ opal_memcons = memcons_load_from_dt(opal_node, "ibm,opal-memcons");
+ if (!opal_memcons) {
+ pr_warn("OPAL: memcons failed to load from ibm,opal-memcons\n");
+ return;
+ }
- opal_memcons = mc;
+ opal_msglog_attr.size = memcons_get_size(opal_memcons);
}
void __init opal_msglog_sysfs_init(void)
--
2.20.1
