Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Oliver O'Halloran | 558 | 100.00% | 1 | 100.00% |
Total | 558 | 1 |
// SPDX-License-Identifier: GPL-2.0 /* * Handles hot and cold plug of persistent memory regions on pseries. */ #define pr_fmt(fmt) "pseries-pmem: " fmt #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/sched.h> /* for idle_task_exit */ #include <linux/sched/hotplug.h> #include <linux/cpu.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/slab.h> #include <asm/prom.h> #include <asm/rtas.h> #include <asm/firmware.h> #include <asm/machdep.h> #include <asm/vdso_datapage.h> #include <asm/plpar_wrappers.h> #include <asm/topology.h> #include "pseries.h" #include "offline_states.h" static struct device_node *pmem_node; static ssize_t pmem_drc_add_node(u32 drc_index) { struct device_node *dn; int rc; pr_debug("Attempting to add pmem node, drc index: %x\n", drc_index); rc = dlpar_acquire_drc(drc_index); if (rc) { pr_err("Failed to acquire DRC, rc: %d, drc index: %x\n", rc, drc_index); return -EINVAL; } dn = dlpar_configure_connector(cpu_to_be32(drc_index), pmem_node); if (!dn) { pr_err("configure-connector failed for drc %x\n", drc_index); dlpar_release_drc(drc_index); return -EINVAL; } /* NB: The of reconfig notifier creates platform device from the node */ rc = dlpar_attach_node(dn, pmem_node); if (rc) { pr_err("Failed to attach node %s, rc: %d, drc index: %x\n", dn->name, rc, drc_index); if (dlpar_release_drc(drc_index)) dlpar_free_cc_nodes(dn); return rc; } pr_info("Successfully added %pOF, drc index: %x\n", dn, drc_index); return 0; } static ssize_t pmem_drc_remove_node(u32 drc_index) { struct device_node *dn; uint32_t index; int rc; for_each_child_of_node(pmem_node, dn) { if (of_property_read_u32(dn, "ibm,my-drc-index", &index)) continue; if (index == drc_index) break; } if (!dn) { pr_err("Attempting to remove unused DRC index %x\n", drc_index); return -ENODEV; } pr_debug("Attempting to remove %pOF, drc index: %x\n", dn, drc_index); /* * NB: tears down the ibm,pmemory device as a side-effect */ rc = dlpar_detach_node(dn); if (rc) return rc; rc = dlpar_release_drc(drc_index); if (rc) { pr_err("Failed to release drc (%x) for CPU %s, rc: %d\n", drc_index, dn->name, rc); dlpar_attach_node(dn, pmem_node); return rc; } pr_info("Successfully removed PMEM with drc index: %x\n", drc_index); return 0; } int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog) { u32 count, drc_index; int rc; /* slim chance, but we might get a hotplug event while booting */ if (!pmem_node) pmem_node = of_find_node_by_type(NULL, "ibm,persistent-memory"); if (!pmem_node) { pr_err("Hotplug event for a pmem device, but none exists\n"); return -ENODEV; } if (hp_elog->id_type != PSERIES_HP_ELOG_ID_DRC_INDEX) { pr_err("Unsupported hotplug event type %d\n", hp_elog->id_type); return -EINVAL; } count = hp_elog->_drc_u.drc_count; drc_index = hp_elog->_drc_u.drc_index; lock_device_hotplug(); if (hp_elog->action == PSERIES_HP_ELOG_ACTION_ADD) { rc = pmem_drc_add_node(drc_index); } else if (hp_elog->action == PSERIES_HP_ELOG_ACTION_REMOVE) { rc = pmem_drc_remove_node(drc_index); } else { pr_err("Unsupported hotplug action (%d)\n", hp_elog->action); rc = -EINVAL; } unlock_device_hotplug(); return rc; } const struct of_device_id drc_pmem_match[] = { { .type = "ibm,persistent-memory", }, {} }; static int pseries_pmem_init(void) { pmem_node = of_find_node_by_type(NULL, "ibm,persistent-memory"); if (!pmem_node) return 0; /* * The generic OF bus probe/populate handles creating platform devices * from the child (ibm,pmemory) nodes. The generic code registers an of * reconfig notifier to handle the hot-add/remove cases too. */ of_platform_bus_probe(pmem_node, drc_pmem_match, NULL); return 0; } machine_arch_initcall(pseries, pseries_pmem_init);
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1