Commit 4c5d87db authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Michael Ellerman

powerpc/pseries: PAPR persistent memory support

This patch implements support for discovering storage class memory
devices at boot and for handling hotplug of new regions via RTAS
hotplug events.
Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
[mpe: Fix CONFIG_MEMORY_HOTPLUG=n build]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 422123cc
......@@ -53,6 +53,7 @@
#define FW_FEATURE_DRMEM_V2 ASM_CONST(0x0000000400000000)
#define FW_FEATURE_DRC_INFO ASM_CONST(0x0000000800000000)
#define FW_FEATURE_BLOCK_REMOVE ASM_CONST(0x0000001000000000)
#define FW_FEATURE_PAPR_SCM ASM_CONST(0x0000002000000000)
#ifndef __ASSEMBLY__
......@@ -70,7 +71,8 @@ enum {
FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
FW_FEATURE_HPT_RESIZE | FW_FEATURE_DRMEM_V2 |
FW_FEATURE_DRC_INFO | FW_FEATURE_BLOCK_REMOVE,
FW_FEATURE_DRC_INFO | FW_FEATURE_BLOCK_REMOVE |
FW_FEATURE_PAPR_SCM,
FW_FEATURE_PSERIES_ALWAYS = 0,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
FW_FEATURE_POWERNV_ALWAYS = 0,
......
......@@ -296,7 +296,15 @@
#define H_INT_ESB 0x3C8
#define H_INT_SYNC 0x3CC
#define H_INT_RESET 0x3D0
#define MAX_HCALL_OPCODE H_INT_RESET
#define H_SCM_READ_METADATA 0x3E4
#define H_SCM_WRITE_METADATA 0x3E8
#define H_SCM_BIND_MEM 0x3EC
#define H_SCM_UNBIND_MEM 0x3F0
#define H_SCM_QUERY_BLOCK_MEM_BINDING 0x3F4
#define H_SCM_QUERY_LOGICAL_MEM_BINDING 0x3F8
#define H_SCM_MEM_QUERY 0x3FC
#define H_SCM_BLOCK_CLEAR 0x400
#define MAX_HCALL_OPCODE H_SCM_BLOCK_CLEAR
/* H_VIOCTL functions */
#define H_GET_VIOA_DUMP_SIZE 0x01
......
......@@ -125,6 +125,7 @@ struct rtas_suspend_me_data {
#define RTAS_TYPE_INFO 0xE2
#define RTAS_TYPE_DEALLOC 0xE3
#define RTAS_TYPE_DUMP 0xE4
#define RTAS_TYPE_HOTPLUG 0xE5
/* I don't add PowerMGM events right now, this is a different topic */
#define RTAS_TYPE_PMGM_POWER_SW_ON 0x60
#define RTAS_TYPE_PMGM_POWER_SW_OFF 0x61
......@@ -329,6 +330,7 @@ struct pseries_hp_errorlog {
#define PSERIES_HP_ELOG_RESOURCE_MEM 2
#define PSERIES_HP_ELOG_RESOURCE_SLOT 3
#define PSERIES_HP_ELOG_RESOURCE_PHB 4
#define PSERIES_HP_ELOG_RESOURCE_PMEM 6
#define PSERIES_HP_ELOG_ACTION_ADD 1
#define PSERIES_HP_ELOG_ACTION_REMOVE 2
......
......@@ -91,6 +91,8 @@ static char *rtas_event_type(int type)
return "Dump Notification Event";
case RTAS_TYPE_PRRN:
return "Platform Resource Reassignment Event";
case RTAS_TYPE_HOTPLUG:
return "Hotplug Event";
}
return rtas_type[0];
......
......@@ -13,7 +13,7 @@ obj-$(CONFIG_KEXEC_CORE) += kexec.o
obj-$(CONFIG_PSERIES_ENERGY) += pseries_energy.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug-cpu.o
obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o
obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o pmem.o
obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
obj-$(CONFIG_HVCS) += hvcserver.o
......
......@@ -355,6 +355,10 @@ int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
case PSERIES_HP_ELOG_RESOURCE_CPU:
rc = dlpar_cpu(hp_elog);
break;
case PSERIES_HP_ELOG_RESOURCE_PMEM:
rc = dlpar_hp_pmem(hp_elog);
break;
default:
pr_warn_ratelimited("Invalid resource (%d) specified\n",
hp_elog->resource);
......
......@@ -66,6 +66,7 @@ hypertas_fw_features_table[] = {
{FW_FEATURE_BEST_ENERGY, "hcall-best-energy-1*"},
{FW_FEATURE_HPT_RESIZE, "hcall-hpt-resize"},
{FW_FEATURE_BLOCK_REMOVE, "hcall-block-remove"},
{FW_FEATURE_PAPR_SCM, "hcall-scm"},
};
/* Build up the firmware features bitmask using the contents of
......
// 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);
......@@ -65,11 +65,16 @@ int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_errlog);
#ifdef CONFIG_MEMORY_HOTPLUG
int dlpar_memory(struct pseries_hp_errorlog *hp_elog);
int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog);
#else
static inline int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
{
return -EOPNOTSUPP;
}
static inline int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog)
{
return -EOPNOTSUPP;
}
#endif
#ifdef CONFIG_HOTPLUG_CPU
......
......@@ -333,7 +333,8 @@ static irqreturn_t ras_hotplug_interrupt(int irq, void *dev_id)
* hotplug events on the ras_log_buf to be handled by rtas_errd.
*/
if (hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_MEM ||
hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_CPU)
hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_CPU ||
hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_PMEM)
queue_hotplug_event(hp_elog);
else
log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
......
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