diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/ultravisor.c')
-rw-r--r-- | arch/powerpc/platforms/powernv/ultravisor.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/ultravisor.c b/arch/powerpc/platforms/powernv/ultravisor.c new file mode 100644 index 0000000000..67c8c4b2d8 --- /dev/null +++ b/arch/powerpc/platforms/powernv/ultravisor.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Ultravisor high level interfaces + * + * Copyright 2019, IBM Corporation. + * + */ +#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) +{ + if (!of_flat_dt_is_compatible(node, "ibm,ultravisor")) + return 0; + + powerpc_firmware_features |= FW_FEATURE_ULTRAVISOR; + 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"); + of_node_put(node); + 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); |