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Message-ID: <31581.1259115310@neuling.org>
Date: Wed, 25 Nov 2009 13:15:10 +1100
From: Michael Neuling <mikey@...ling.org>
To: Nathan Fontenot <nfont@...tin.ibm.com>
cc: linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Kernel DLPAR infrastructure
In message <4B0C8CE3.4010207@...tin.ibm.com> you wrote:
> This patch provides the kernel DLPAR infrastructure in a new filed named
> dlpar.c. The functionality provided is for acquiring and releasing a resourc
e
> from firmware and the parsing of information returned from the
> ibm,configure-connector rtas call. Additionally this exports the pSeries
> reconfiguration notifier chain so that it can be invoked when device tree
> updates are made.
>
> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
These look like they got white space munged somewhere...
Mikey
> ---
>
> ---
> arch/powerpc/include/asm/pSeries_reconfig.h | 1
> arch/powerpc/platforms/pseries/Makefile | 2
> arch/powerpc/platforms/pseries/dlpar.c | 324 +++++++++++++++++++++++++
+++
> arch/powerpc/platforms/pseries/reconfig.c | 2
> 4 files changed, 327 insertions(+), 2 deletions(-)
>
> Index: powerpc/arch/powerpc/platforms/pseries/dlpar.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ powerpc/arch/powerpc/platforms/pseries/dlpar.c 2009-11-24 23:31:28.000
000000 -0600
> @@ -0,0 +1,324 @@
> +/*
> + * Support for dynamic reconfiguration for PCI, Memory, and CPU
> + * Hotplug and Dynamic Logical Partitioning on RPA platforms.
> + *
> + * Copyright (C) 2009 Nathan Fontenot
> + * Copyright (C) 2009 IBM Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License version
> + * 2 as published by the Free Software Foundation.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/kref.h>
> +#include <linux/notifier.h>
> +#include <linux/proc_fs.h>
> +#include <linux/spinlock.h>
> +#include <linux/cpu.h>
> +
> +#include <asm/prom.h>
> +#include <asm/machdep.h>
> +#include <asm/uaccess.h>
> +#include <asm/rtas.h>
> +#include <asm/pSeries_reconfig.h>
> +
> +struct cc_workarea {
> + u32 drc_index;
> + u32 zero;
> + u32 name_offset;
> + u32 prop_length;
> + u32 prop_offset;
> +};
> +
> +static void dlpar_free_cc_property(struct property *prop)
> +{
> + kfree(prop->name);
> + kfree(prop->value);
> + kfree(prop);
> +}
> +
> +static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
> +{
> + struct property *prop;
> + char *name;
> + char *value;
> +
> + prop = kzalloc(sizeof(*prop), GFP_KERNEL);
> + if (!prop)
> + return NULL;
> +
> + name = (char *)ccwa + ccwa->name_offset;
> + prop->name = kstrdup(name, GFP_KERNEL);
> +
> + prop->length = ccwa->prop_length;
> + value = (char *)ccwa + ccwa->prop_offset;
> + prop->value = kzalloc(prop->length, GFP_KERNEL);
> + if (!prop->value) {
> + dlpar_free_cc_property(prop);
> + return NULL;
> + }
> +
> + memcpy(prop->value, value, prop->length);
> + return prop;
> +}
> +
> +static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
> +{
> + struct device_node *dn;
> + char *name;
> +
> + dn = kzalloc(sizeof(*dn), GFP_KERNEL);
> + if (!dn)
> + return NULL;
> +
> + name = (char *)ccwa + ccwa->name_offset;
> + dn->full_name = kstrdup(name, GFP_KERNEL);
> +
> + return dn;
> +}
> +
> +static void dlpar_free_one_cc_node(struct device_node *dn)
> +{
> + struct property *prop;
> +
> + while (dn->properties) {
> + prop = dn->properties;
> + dn->properties = prop->next;
> + dlpar_free_cc_property(prop);
> + }
> +
> + kfree(dn->full_name);
> + kfree(dn);
> +}
> +
> +static void dlpar_free_cc_nodes(struct device_node *dn)
> +{
> + if (dn->child)
> + dlpar_free_cc_nodes(dn->child);
> +
> + if (dn->sibling)
> + dlpar_free_cc_nodes(dn->sibling);
> +
> + dlpar_free_one_cc_node(dn);
> +}
> +
> +#define NEXT_SIBLING 1
> +#define NEXT_CHILD 2
> +#define NEXT_PROPERTY 3
> +#define PREV_PARENT 4
> +#define MORE_MEMORY 5
> +#define CALL_AGAIN -2
> +#define ERR_CFG_USE -9003
> +
> +struct device_node *dlpar_configure_connector(u32 drc_index)
> +{
> + struct device_node *dn;
> + struct device_node *first_dn = NULL;
> + struct device_node *last_dn = NULL;
> + struct property *property;
> + struct property *last_property = NULL;
> + struct cc_workarea *ccwa;
> + int cc_token;
> + int rc;
> +
> + cc_token = rtas_token("ibm,configure-connector");
> + if (cc_token == RTAS_UNKNOWN_SERVICE)
> + return NULL;
> +
> + spin_lock(&rtas_data_buf_lock);
> + ccwa = (struct cc_workarea *)&rtas_data_buf[0];
> + ccwa->drc_index = drc_index;
> + ccwa->zero = 0;
> +
> + rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
> + while (rc) {
> + switch (rc) {
> + case NEXT_SIBLING:
> + dn = dlpar_parse_cc_node(ccwa);
> + if (!dn)
> + goto cc_error;
> +
> + dn->parent = last_dn->parent;
> + last_dn->sibling = dn;
> + last_dn = dn;
> + break;
> +
> + case NEXT_CHILD:
> + dn = dlpar_parse_cc_node(ccwa);
> + if (!dn)
> + goto cc_error;
> +
> + if (!first_dn)
> + first_dn = dn;
> + else {
> + dn->parent = last_dn;
> + if (last_dn)
> + last_dn->child = dn;
> + }
> +
> + last_dn = dn;
> + break;
> +
> + case NEXT_PROPERTY:
> + property = dlpar_parse_cc_property(ccwa);
> + if (!property)
> + goto cc_error;
> +
> + if (!last_dn->properties)
> + last_dn->properties = property;
> + else
> + last_property->next = property;
> +
> + last_property = property;
> + break;
> +
> + case PREV_PARENT:
> + last_dn = last_dn->parent;
> + break;
> +
> + case CALL_AGAIN:
> + break;
> +
> + case MORE_MEMORY:
> + case ERR_CFG_USE:
> + default:
> + printk(KERN_ERR "Unexpected Error (%d) "
> + "returned from configure-connector\n", rc);
> + goto cc_error;
> + }
> +
> + rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
> + }
> +
> + spin_unlock(&rtas_data_buf_lock);
> + return first_dn;
> +
> +cc_error:
> + if (first_dn)
> + dlpar_free_cc_nodes(first_dn);
> + spin_unlock(&rtas_data_buf_lock);
> + return NULL;
> +}
> +
> +static struct device_node *derive_parent(const char *path)
> +{
> + struct device_node *parent;
> + char parent_path[128];
> + int parent_path_len;
> +
> + parent_path_len = strrchr(path, '/') - path + 1;
> + strlcpy(parent_path, path, parent_path_len);
> +
> + parent = of_find_node_by_path(parent_path);
> +
> + return parent;
> +}
> +
> +int dlpar_attach_node(struct device_node *dn)
> +{
> + struct proc_dir_entry *ent;
> + int rc;
> +
> + of_node_set_flag(dn, OF_DYNAMIC);
> + kref_init(&dn->kref);
> + dn->parent = derive_parent(dn->full_name);
> +
> + rc = blocking_notifier_call_chain(&pSeries_reconfig_chain,
> + PSERIES_RECONFIG_ADD, dn);
> + if (rc == NOTIFY_BAD) {
> + printk(KERN_ERR "Failed to add device node %s\n",
> + dn->full_name);
> + return -ENOMEM; /* For now, safe to assume kmalloc failure */
> + }
> +
> + of_attach_node(dn);
> +
> +#ifdef CONFIG_PROC_DEVICETREE
> + ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
> + if (ent)
> + proc_device_tree_add_node(dn, ent);
> +#endif
> +
> + of_node_put(dn->parent);
> + return 0;
> +}
> +
> +int dlpar_detach_node(struct device_node *dn)
> +{
> + struct device_node *parent = dn->parent;
> + struct property *prop = dn->properties;
> +
> +#ifdef CONFIG_PROC_DEVICETREE
> + while (prop) {
> + remove_proc_entry(prop->name, dn->pde);
> + prop = prop->next;
> + }
> +
> + if (dn->pde)
> + remove_proc_entry(dn->pde->name, parent->pde);
> +#endif
> +
> + blocking_notifier_call_chain(&pSeries_reconfig_chain,
> + PSERIES_RECONFIG_REMOVE, dn);
> + of_detach_node(dn);
> + of_node_put(dn); /* Must decrement the refcount */
> +
> + return 0;
> +}
> +
> +#define DR_ENTITY_SENSE 9003
> +#define DR_ENTITY_PRESENT 1
> +#define DR_ENTITY_UNUSABLE 2
> +#define ALLOCATION_STATE 9003
> +#define ALLOC_UNUSABLE 0
> +#define ALLOC_USABLE 1
> +#define ISOLATION_STATE 9001
> +#define ISOLATE 0
> +#define UNISOLATE 1
> +
> +int dlpar_acquire_drc(u32 drc_index)
> +{
> + int dr_status, rc;
> +
> + rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
> + DR_ENTITY_SENSE, drc_index);
> + if (rc || dr_status != DR_ENTITY_UNUSABLE)
> + return -1;
> +
> + rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
> + if (rc)
> + return rc;
> +
> + rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
> + if (rc) {
> + rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE)
;
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +int dlpar_release_drc(u32 drc_index)
> +{
> + int dr_status, rc;
> +
> + rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
> + DR_ENTITY_SENSE, drc_index);
> + if (rc || dr_status != DR_ENTITY_PRESENT)
> + return -1;
> +
> + rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
> + if (rc)
> + return rc;
> +
> + rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
> + if (rc) {
> + rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +
> Index: powerpc/arch/powerpc/platforms/pseries/Makefile
> ===================================================================
> --- powerpc.orig/arch/powerpc/platforms/pseries/Makefile 2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/platforms/pseries/Makefile 2009-11-20 17:55:52.000
000000 -0600
> @@ -8,7 +8,7 @@
>
> obj-y := lpar.o hvCall.o nvram.o reconfig.o \
> setup.o iommu.o ras.o rtasd.o \
> - firmware.o power.o
> + firmware.o power.o dlpar.o
> obj-$(CONFIG_SMP) += smp.o
> obj-$(CONFIG_XICS) += xics.o
> obj-$(CONFIG_SCANLOG) += scanlog.o
> Index: powerpc/arch/powerpc/include/asm/pSeries_reconfig.h
> ===================================================================
> --- powerpc.orig/arch/powerpc/include/asm/pSeries_reconfig.h 2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/include/asm/pSeries_reconfig.h 2009-11-20 17:5
5:52.000000000 -0600
> @@ -17,6 +17,7 @@
> #ifdef CONFIG_PPC_PSERIES
> extern int pSeries_reconfig_notifier_register(struct notifier_block *);
> extern void pSeries_reconfig_notifier_unregister(struct notifier_block *);
> +extern struct blocking_notifier_head pSeries_reconfig_chain;
> #else /* !CONFIG_PPC_PSERIES */
> static inline int pSeries_reconfig_notifier_register(struct notifier_block *
nb)
> {
> Index: powerpc/arch/powerpc/platforms/pseries/reconfig.c
> ===================================================================
> --- powerpc.orig/arch/powerpc/platforms/pseries/reconfig.c 2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/platforms/pseries/reconfig.c 2009-11-20 17:55:52.000
000000 -0600
> @@ -96,7 +96,7 @@
> return parent;
> }
>
> -static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
> +BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
>
> int pSeries_reconfig_notifier_register(struct notifier_block *nb)
> {
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
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