Ultravisor (UV) provides an in-memory console which follows the OPAL
in-memory console structure.
This patch extends the OPAL msglog code to also initialize the UV memory
console and provide a sysfs interface (uv_msglog) for userspace to view
the UV message log.
CC: Madhavan Srinivasan <maddy@xxxxxxxxxxxxxxxxxx>
CC: Oliver O'Halloran <oohall@xxxxxxxxx>
Signed-off-by: Claudio Carvalho <cclaudio@xxxxxxxxxxxxx>
---
This patch depends on the "kvmppc: Paravirtualize KVM to support
ultravisor" patchset submitted by Claudio Carvalho.
---
arch/powerpc/platforms/powernv/opal-msglog.c | 99 ++++++++++++++------
1 file changed, 72 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/opal-msglog.c b/arch/powerpc/platforms/powernv/opal-msglog.c
index dc51d03c6370..da73908fdabe 100644
--- a/arch/powerpc/platforms/powernv/opal-msglog.c
+++ b/arch/powerpc/platforms/powernv/opal-msglog.c
@@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/types.h>
#include <asm/barrier.h>
+#include <asm/firmware.h>
/* OPAL in-memory console. Defined in OPAL source at core/console.c */
struct memcons {
@@ -28,24 +29,26 @@ struct memcons {
};
static struct memcons *opal_memcons = NULL;
+static struct memcons *opal_uv_memcons;
-ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
+static ssize_t msglog_copy(struct memcons *memcons, const char *bin_attr_name,
+ 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 (!memcons)
return -ENODEV;
- out_pos = be32_to_cpu(READ_ONCE(opal_memcons->out_pos));
+ out_pos = be32_to_cpu(READ_ONCE(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));
+ conbuf = phys_to_virt(be64_to_cpu(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
@@ -53,7 +56,7 @@ 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(memcons->obuf_size) - out_pos;
ret = memory_read_from_buffer(to, count, &pos,
conbuf + out_pos, avail);
@@ -71,8 +74,8 @@ 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)) {
- pr_err("OPAL: memory console corruption. Aborting read.\n");
+ if (out_pos > be32_to_cpu(memcons->obuf_size)) {
+ pr_err("OPAL: %s corruption. Aborting read.\n", bin_attr_name);
return -EINVAL;
}
@@ -86,53 +89,95 @@ ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
return ret;
}
+#define BIN_ATTR_NAME_OPAL "msglog"
+#define BIN_ATTR_NAME_UV "uv_msglog"
+
+ssize_t opal_msglog_copy(char *to, loff_t pos, size_t count)
+{
+ return msglog_copy(opal_memcons, BIN_ATTR_NAME_OPAL, 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 msglog_copy(opal_memcons, BIN_ATTR_NAME_OPAL, to, pos,
+ count);
+}
+
+static ssize_t opal_uv_msglog_read(struct file *file, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *to,
+ loff_t pos, size_t count)
+{
+ return msglog_copy(opal_uv_memcons, BIN_ATTR_NAME_UV, to, pos,
+ count);
}
static struct bin_attribute opal_msglog_attr = {
- .attr = {.name = "msglog", .mode = 0400},
+ .attr = {.name = BIN_ATTR_NAME_OPAL, .mode = 0400},
.read = opal_msglog_read
};
-void __init opal_msglog_init(void)
+static struct bin_attribute opal_uv_msglog_attr = {
+ .attr = {.name = BIN_ATTR_NAME_UV, .mode = 0400},
+ .read = opal_uv_msglog_read
+};
+
+static void __init msglog_init(struct memcons **memcons,
+ struct bin_attribute *bin_attr,
+ const char *dt_prop_name)
{
- u64 mcaddr;
- struct memcons *mc;
+ u64 memcons_addr;
- if (of_property_read_u64(opal_node, "ibm,opal-memcons", &mcaddr)) {
- pr_warn("OPAL: Property ibm,opal-memcons not found, no message log\n");
+ if (of_property_read_u64(opal_node, dt_prop_name, &memcons_addr)) {
+ pr_warn("OPAL: Property '%s' not found, no message log\n",
+ dt_prop_name);
return;
}
- mc = phys_to_virt(mcaddr);
- if (!mc) {
- pr_warn("OPAL: memory console address is invalid\n");
+ *memcons = phys_to_virt(memcons_addr);
+ if (!(*memcons)) {
+ pr_warn("OPAL: '%s' address is invalid\n", dt_prop_name);
return;
}
- if (be64_to_cpu(mc->magic) != MEMCONS_MAGIC) {
- pr_warn("OPAL: memory console version is invalid\n");
+ if (be64_to_cpu((*memcons)->magic) != MEMCONS_MAGIC) {
+ pr_warn("OPAL: '%s' version is invalid\n", dt_prop_name);
+ *memcons = NULL;
return;
}
/* Report maximum size */
- opal_msglog_attr.size = be32_to_cpu(mc->ibuf_size) +
- be32_to_cpu(mc->obuf_size);
+ bin_attr->size = be32_to_cpu((*memcons)->ibuf_size) +
+ be32_to_cpu((*memcons)->obuf_size);
+}
- opal_memcons = mc;
+void __init opal_msglog_init(void)
+{
+ msglog_init(&opal_memcons, &opal_msglog_attr, "ibm,opal-memcons");
+ if (firmware_has_feature(FW_FEATURE_ULTRAVISOR))
+ msglog_init(&opal_uv_memcons, &opal_uv_msglog_attr,
+ "ibm,opal-uv-memcons");
}
-void __init opal_msglog_sysfs_init(void)
+static void __init msglog_sysfs_create(struct memcons *memcons,
+ struct bin_attribute *bin_attr)
{
- if (!opal_memcons) {
- pr_warn("OPAL: message log initialisation failed, not creating sysfs entry\n");
+ if (!memcons) {
+ pr_warn("OPAL: %s initialization failed, not creating sysfs entry\n",
+ bin_attr->attr.name);
return;
}
- if (sysfs_create_bin_file(opal_kobj, &opal_msglog_attr) != 0)
- pr_warn("OPAL: sysfs file creation failed\n");
+ if (sysfs_create_bin_file(opal_kobj, bin_attr) != 0)
+ pr_warn("OPAL: sysfs %s creation failed\n",
+ bin_attr->attr.name);
+}
+
+void __init opal_msglog_sysfs_init(void)
+{
+ msglog_sysfs_create(opal_memcons, &opal_msglog_attr);
+ if (firmware_has_feature(FW_FEATURE_ULTRAVISOR))
+ msglog_sysfs_create(opal_uv_memcons, &opal_uv_msglog_attr);
}
--
2.20.1
