powerpc/powernv: Add ultravisor message log interface
The ultravisor (UV) provides an in-memory console which follows the
OPAL in-memory console structure.
This patch extends the OPAL msglog code to initialize the UV memory
console and provide the "/sys/firmware/ultravisor/msglog" interface
for userspace to view the UV message log.
Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190828130521.26764-2-mpe@ellerman.id.au
diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h
index fd4a1c5..1aa51c4 100644
--- a/arch/powerpc/platforms/powernv/powernv.h
+++ b/arch/powerpc/platforms/powernv/powernv.h
@@ -30,4 +30,9 @@ extern void opal_event_shutdown(void);
bool cpu_core_split_required(void);
+struct memcons;
+ssize_t memcons_copy(struct memcons *mc, char *to, loff_t pos, size_t count);
+u32 memcons_get_size(struct memcons *mc);
+struct memcons *memcons_init(struct device_node *node, const char *mc_prop_name);
+
#endif /* _POWERNV_H */
diff --git a/arch/powerpc/platforms/powernv/ultravisor.c b/arch/powerpc/platforms/powernv/ultravisor.c
index 02ac57b..e4a00ad 100644
--- a/arch/powerpc/platforms/powernv/ultravisor.c
+++ b/arch/powerpc/platforms/powernv/ultravisor.c
@@ -8,9 +8,15 @@
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/of_fdt.h>
+#include <linux/of.h>
#include <asm/ultravisor.h>
#include <asm/firmware.h>
+#include <asm/machdep.h>
+
+#include "powernv.h"
+
+static struct kobject *ultravisor_kobj;
int __init early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
int depth, void *data)
@@ -22,3 +28,42 @@ int __init early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
pr_debug("Ultravisor detected!\n");
return 1;
}
+
+static struct memcons *uv_memcons;
+
+static ssize_t uv_msglog_read(struct file *file, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *to,
+ loff_t pos, size_t count)
+{
+ return memcons_copy(uv_memcons, to, pos, count);
+}
+
+static struct bin_attribute uv_msglog_attr = {
+ .attr = {.name = "msglog", .mode = 0400},
+ .read = uv_msglog_read
+};
+
+static int __init uv_init(void)
+{
+ struct device_node *node;
+
+ if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
+ return 0;
+
+ node = of_find_compatible_node(NULL, NULL, "ibm,uv-firmware");
+ if (!node)
+ return -ENODEV;
+
+ uv_memcons = memcons_init(node, "memcons");
+ if (!uv_memcons)
+ return -ENOENT;
+
+ uv_msglog_attr.size = memcons_get_size(uv_memcons);
+
+ ultravisor_kobj = kobject_create_and_add("ultravisor", firmware_kobj);
+ if (!ultravisor_kobj)
+ return -ENOMEM;
+
+ return sysfs_create_bin_file(ultravisor_kobj, &uv_msglog_attr);
+}
+machine_subsys_initcall(powernv, uv_init);
