blob: 26c80e18d7b1b47bd74e9fce01bdb48eeb88fcbd [file] [log] [blame]
/* mdesc.c: Sun4V machine description handling.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/memblock.h>
#include <linux/log2.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <asm/cpudata.h>
#include <asm/hypervisor.h>
#include <asm/mdesc.h>
#include <asm/prom.h>
#include <asm/uaccess.h>
#include <asm/oplib.h>
#include <asm/smp.h>
/* Unlike the OBP device tree, the machine description is a full-on
* DAG. An arbitrary number of ARCs are possible from one
* node to other nodes and thus we can't use the OBP device_node
* data structure to represent these nodes inside of the kernel.
*
* Actually, it isn't even a DAG, because there are back pointers
* which create cycles in the graph.
*
* mdesc_hdr and mdesc_elem describe the layout of the data structure
* we get from the Hypervisor.
*/
struct mdesc_hdr {
u32 version; /* Transport version */
u32 node_sz; /* node block size */
u32 name_sz; /* name block size */
u32 data_sz; /* data block size */
} __attribute__((aligned(16)));
struct mdesc_elem {
u8 tag;
#define MD_LIST_END 0x00
#define MD_NODE 0x4e
#define MD_NODE_END 0x45
#define MD_NOOP 0x20
#define MD_PROP_ARC 0x61
#define MD_PROP_VAL 0x76
#define MD_PROP_STR 0x73
#define MD_PROP_DATA 0x64
u8 name_len;
u16 resv;
u32 name_offset;
union {
struct {
u32 data_len;
u32 data_offset;
} data;
u64 val;
} d;
};
struct mdesc_mem_ops {
struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
void (*free)(struct mdesc_handle *handle);
};
struct mdesc_handle {
struct list_head list;
struct mdesc_mem_ops *mops;
void *self_base;
atomic_t refcnt;
unsigned int handle_size;
struct mdesc_hdr mdesc;
};
static void mdesc_handle_init(struct mdesc_handle *hp,
unsigned int handle_size,
void *base)
{
BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
memset(hp, 0, handle_size);
INIT_LIST_HEAD(&hp->list);
hp->self_base = base;
atomic_set(&hp->refcnt, 1);
hp->handle_size = handle_size;
}
static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
{
unsigned int handle_size, alloc_size;
struct mdesc_handle *hp;
unsigned long paddr;
handle_size = (sizeof(struct mdesc_handle) -
sizeof(struct mdesc_hdr) +
mdesc_size);
alloc_size = PAGE_ALIGN(handle_size);
paddr = memblock_alloc(alloc_size, PAGE_SIZE);
hp = NULL;
if (paddr) {
hp = __va(paddr);
mdesc_handle_init(hp, handle_size, hp);
}
return hp;
}
static void __init mdesc_memblock_free(struct mdesc_handle *hp)
{
unsigned int alloc_size;
unsigned long start;
BUG_ON(atomic_read(&hp->refcnt) != 0);
BUG_ON(!list_empty(&hp->list));
alloc_size = PAGE_ALIGN(hp->handle_size);
start = __pa(hp);
free_bootmem_late(start, alloc_size);
}
static struct mdesc_mem_ops memblock_mdesc_ops = {
.alloc = mdesc_memblock_alloc,
.free = mdesc_memblock_free,
};
static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
{
unsigned int handle_size;
struct mdesc_handle *hp;
unsigned long addr;
void *base;
handle_size = (sizeof(struct mdesc_handle) -
sizeof(struct mdesc_hdr) +
mdesc_size);
/*
* Allocation has to succeed because mdesc update would be missed
* and such events are not retransmitted.
*/
base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
addr = (unsigned long)base;
addr = (addr + 15UL) & ~15UL;
hp = (struct mdesc_handle *) addr;
mdesc_handle_init(hp, handle_size, base);
return hp;
}
static void mdesc_kfree(struct mdesc_handle *hp)
{
BUG_ON(atomic_read(&hp->refcnt) != 0);
BUG_ON(!list_empty(&hp->list));
kfree(hp->self_base);
}
static struct mdesc_mem_ops kmalloc_mdesc_memops = {
.alloc = mdesc_kmalloc,
.free = mdesc_kfree,
};
static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
struct mdesc_mem_ops *mops)
{
struct mdesc_handle *hp = mops->alloc(mdesc_size);
if (hp)
hp->mops = mops;
return hp;
}
static void mdesc_free(struct mdesc_handle *hp)
{
hp->mops->free(hp);
}
static struct mdesc_handle *cur_mdesc;
static LIST_HEAD(mdesc_zombie_list);
static DEFINE_SPINLOCK(mdesc_lock);
struct mdesc_handle *mdesc_grab(void)
{
struct mdesc_handle *hp;
unsigned long flags;
spin_lock_irqsave(&mdesc_lock, flags);
hp = cur_mdesc;
if (hp)
atomic_inc(&hp->refcnt);
spin_unlock_irqrestore(&mdesc_lock, flags);
return hp;
}
EXPORT_SYMBOL(mdesc_grab);
void mdesc_release(struct mdesc_handle *hp)
{
unsigned long flags;
spin_lock_irqsave(&mdesc_lock, flags);
if (atomic_dec_and_test(&hp->refcnt)) {
list_del_init(&hp->list);
hp->mops->free(hp);
}
spin_unlock_irqrestore(&mdesc_lock, flags);
}
EXPORT_SYMBOL(mdesc_release);
static DEFINE_MUTEX(mdesc_mutex);
static struct mdesc_notifier_client *client_list;
void mdesc_register_notifier(struct mdesc_notifier_client *client)
{
u64 node;
mutex_lock(&mdesc_mutex);
client->next = client_list;
client_list = client;
mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
client->add(cur_mdesc, node);
mutex_unlock(&mdesc_mutex);
}
static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
{
const u64 *id;
u64 a;
id = NULL;
mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
u64 target;
target = mdesc_arc_target(hp, a);
id = mdesc_get_property(hp, target,
"cfg-handle", NULL);
if (id)
break;
}
return id;
}
/* Run 'func' on nodes which are in A but not in B. */
static void invoke_on_missing(const char *name,
struct mdesc_handle *a,
struct mdesc_handle *b,
void (*func)(struct mdesc_handle *, u64))
{
u64 node;
mdesc_for_each_node_by_name(a, node, name) {
int found = 0, is_vdc_port = 0;
const char *name_prop;
const u64 *id;
u64 fnode;
name_prop = mdesc_get_property(a, node, "name", NULL);
if (name_prop && !strcmp(name_prop, "vdc-port")) {
is_vdc_port = 1;
id = parent_cfg_handle(a, node);
} else
id = mdesc_get_property(a, node, "id", NULL);
if (!id) {
printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
(name_prop ? name_prop : name));
continue;
}
mdesc_for_each_node_by_name(b, fnode, name) {
const u64 *fid;
if (is_vdc_port) {
name_prop = mdesc_get_property(b, fnode,
"name", NULL);
if (!name_prop ||
strcmp(name_prop, "vdc-port"))
continue;
fid = parent_cfg_handle(b, fnode);
if (!fid) {
printk(KERN_ERR "MD: Cannot find ID "
"for vdc-port node.\n");
continue;
}
} else
fid = mdesc_get_property(b, fnode,
"id", NULL);
if (*id == *fid) {
found = 1;
break;
}
}
if (!found)
func(a, node);
}
}
static void notify_one(struct mdesc_notifier_client *p,
struct mdesc_handle *old_hp,
struct mdesc_handle *new_hp)
{
invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
}
static void mdesc_notify_clients(struct mdesc_handle *old_hp,
struct mdesc_handle *new_hp)
{
struct mdesc_notifier_client *p = client_list;
while (p) {
notify_one(p, old_hp, new_hp);
p = p->next;
}
}
void mdesc_update(void)
{
unsigned long len, real_len, status;
struct mdesc_handle *hp, *orig_hp;
unsigned long flags;
mutex_lock(&mdesc_mutex);
(void) sun4v_mach_desc(0UL, 0UL, &len);
hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
if (!hp) {
printk(KERN_ERR "MD: mdesc alloc fails\n");
goto out;
}
status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
if (status != HV_EOK || real_len > len) {
printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
status);
atomic_dec(&hp->refcnt);
mdesc_free(hp);
goto out;
}
spin_lock_irqsave(&mdesc_lock, flags);
orig_hp = cur_mdesc;
cur_mdesc = hp;
spin_unlock_irqrestore(&mdesc_lock, flags);
mdesc_notify_clients(orig_hp, hp);
spin_lock_irqsave(&mdesc_lock, flags);
if (atomic_dec_and_test(&orig_hp->refcnt))
mdesc_free(orig_hp);
else
list_add(&orig_hp->list, &mdesc_zombie_list);
spin_unlock_irqrestore(&mdesc_lock, flags);
out:
mutex_unlock(&mdesc_mutex);
}
static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
{
return (struct mdesc_elem *) (mdesc + 1);
}
static void *name_block(struct mdesc_hdr *mdesc)
{
return ((void *) node_block(mdesc)) + mdesc->node_sz;
}
static void *data_block(struct mdesc_hdr *mdesc)
{
return ((void *) name_block(mdesc)) + mdesc->name_sz;
}
u64 mdesc_node_by_name(struct mdesc_handle *hp,
u64 from_node, const char *name)
{
struct mdesc_elem *ep = node_block(&hp->mdesc);
const char *names = name_block(&hp->mdesc);
u64 last_node = hp->mdesc.node_sz / 16;
u64 ret;
if (from_node == MDESC_NODE_NULL) {
ret = from_node = 0;
} else if (from_node >= last_node) {
return MDESC_NODE_NULL;
} else {
ret = ep[from_node].d.val;
}
while (ret < last_node) {
if (ep[ret].tag != MD_NODE)
return MDESC_NODE_NULL;
if (!strcmp(names + ep[ret].name_offset, name))
break;
ret = ep[ret].d.val;
}
if (ret >= last_node)
ret = MDESC_NODE_NULL;
return ret;
}
EXPORT_SYMBOL(mdesc_node_by_name);
const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
const char *name, int *lenp)
{
const char *names = name_block(&hp->mdesc);
u64 last_node = hp->mdesc.node_sz / 16;
void *data = data_block(&hp->mdesc);
struct mdesc_elem *ep;
if (node == MDESC_NODE_NULL || node >= last_node)
return NULL;
ep = node_block(&hp->mdesc) + node;
ep++;
for (; ep->tag != MD_NODE_END; ep++) {
void *val = NULL;
int len = 0;
switch (ep->tag) {
case MD_PROP_VAL:
val = &ep->d.val;
len = 8;
break;
case MD_PROP_STR:
case MD_PROP_DATA:
val = data + ep->d.data.data_offset;
len = ep->d.data.data_len;
break;
default:
break;
}
if (!val)
continue;
if (!strcmp(names + ep->name_offset, name)) {
if (lenp)
*lenp = len;
return val;
}
}
return NULL;
}
EXPORT_SYMBOL(mdesc_get_property);
u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
{
struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
const char *names = name_block(&hp->mdesc);
u64 last_node = hp->mdesc.node_sz / 16;
if (from == MDESC_NODE_NULL || from >= last_node)
return MDESC_NODE_NULL;
ep = base + from;
ep++;
for (; ep->tag != MD_NODE_END; ep++) {
if (ep->tag != MD_PROP_ARC)
continue;
if (strcmp(names + ep->name_offset, arc_type))
continue;
return ep - base;
}
return MDESC_NODE_NULL;
}
EXPORT_SYMBOL(mdesc_next_arc);
u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
{
struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
ep = base + arc;
return ep->d.val;
}
EXPORT_SYMBOL(mdesc_arc_target);
const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
{
struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
const char *names = name_block(&hp->mdesc);
u64 last_node = hp->mdesc.node_sz / 16;
if (node == MDESC_NODE_NULL || node >= last_node)
return NULL;
ep = base + node;
if (ep->tag != MD_NODE)
return NULL;
return names + ep->name_offset;
}
EXPORT_SYMBOL(mdesc_node_name);
static u64 max_cpus = 64;
static void __init report_platform_properties(void)
{
struct mdesc_handle *hp = mdesc_grab();
u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
const char *s;
const u64 *v;
if (pn == MDESC_NODE_NULL) {
prom_printf("No platform node in machine-description.\n");
prom_halt();
}
s = mdesc_get_property(hp, pn, "banner-name", NULL);
printk("PLATFORM: banner-name [%s]\n", s);
s = mdesc_get_property(hp, pn, "name", NULL);
printk("PLATFORM: name [%s]\n", s);
v = mdesc_get_property(hp, pn, "hostid", NULL);
if (v)
printk("PLATFORM: hostid [%08llx]\n", *v);
v = mdesc_get_property(hp, pn, "serial#", NULL);
if (v)
printk("PLATFORM: serial# [%08llx]\n", *v);
v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
printk("PLATFORM: stick-frequency [%08llx]\n", *v);
v = mdesc_get_property(hp, pn, "mac-address", NULL);
if (v)
printk("PLATFORM: mac-address [%llx]\n", *v);
v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
if (v)
printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
if (v)
printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
v = mdesc_get_property(hp, pn, "max-cpus", NULL);
if (v) {
max_cpus = *v;
printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
}
#ifdef CONFIG_SMP
{
int max_cpu, i;
if (v) {
max_cpu = *v;
if (max_cpu > NR_CPUS)
max_cpu = NR_CPUS;
} else {
max_cpu = NR_CPUS;
}
for (i = 0; i < max_cpu; i++)
set_cpu_possible(i, true);
}
#endif
mdesc_release(hp);
}
static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
{
const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
const char *type;
int type_len;
type = mdesc_get_property(hp, mp, "type", &type_len);
switch (*level) {
case 1:
if (of_find_in_proplist(type, "instn", type_len)) {
c->icache_size = *size;
c->icache_line_size = *line_size;
} else if (of_find_in_proplist(type, "data", type_len)) {
c->dcache_size = *size;
c->dcache_line_size = *line_size;
}
break;
case 2:
c->ecache_size = *size;
c->ecache_line_size = *line_size;
break;
default:
break;
}
if (*level == 1) {
u64 a;
mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
u64 target = mdesc_arc_target(hp, a);
const char *name = mdesc_node_name(hp, target);
if (!strcmp(name, "cache"))
fill_in_one_cache(c, hp, target);
}
}
}
static void mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
{
u64 a;
mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
u64 t = mdesc_arc_target(hp, a);
const char *name;
const u64 *id;
name = mdesc_node_name(hp, t);
if (!strcmp(name, "cpu")) {
id = mdesc_get_property(hp, t, "id", NULL);
if (*id < NR_CPUS)
cpu_data(*id).core_id = core_id;
} else {
u64 j;
mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
u64 n = mdesc_arc_target(hp, j);
const char *n_name;
n_name = mdesc_node_name(hp, n);
if (strcmp(n_name, "cpu"))
continue;
id = mdesc_get_property(hp, n, "id", NULL);
if (*id < NR_CPUS)
cpu_data(*id).core_id = core_id;
}
}
}
}
static void set_core_ids(struct mdesc_handle *hp)
{
int idx;
u64 mp;
idx = 1;
mdesc_for_each_node_by_name(hp, mp, "cache") {
const u64 *level;
const char *type;
int len;
level = mdesc_get_property(hp, mp, "level", NULL);
if (*level != 1)
continue;
type = mdesc_get_property(hp, mp, "type", &len);
if (!of_find_in_proplist(type, "instn", len))
continue;
mark_core_ids(hp, mp, idx);
idx++;
}
}
static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
{
u64 a;
mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
u64 t = mdesc_arc_target(hp, a);
const char *name;
const u64 *id;
name = mdesc_node_name(hp, t);
if (strcmp(name, "cpu"))
continue;
id = mdesc_get_property(hp, t, "id", NULL);
if (*id < NR_CPUS)
cpu_data(*id).proc_id = proc_id;
}
}
static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
{
int idx;
u64 mp;
idx = 0;
mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
const char *type;
int len;
type = mdesc_get_property(hp, mp, "type", &len);
if (!of_find_in_proplist(type, "int", len) &&
!of_find_in_proplist(type, "integer", len))
continue;
mark_proc_ids(hp, mp, idx);
idx++;
}
}
static void set_proc_ids(struct mdesc_handle *hp)
{
__set_proc_ids(hp, "exec_unit");
__set_proc_ids(hp, "exec-unit");
}
static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
unsigned long def, unsigned long max)
{
u64 val;
if (!p)
goto use_default;
val = *p;
if (!val || val >= 64)
goto use_default;
if (val > max)
val = max;
*mask = ((1U << val) * 64U) - 1U;
return;
use_default:
*mask = ((1U << def) * 64U) - 1U;
}
static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
struct trap_per_cpu *tb)
{
static int printed;
const u64 *val;
val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
if (!printed++) {
pr_info("SUN4V: Mondo queue sizes "
"[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
tb->cpu_mondo_qmask + 1,
tb->dev_mondo_qmask + 1,
tb->resum_qmask + 1,
tb->nonresum_qmask + 1);
}
}
static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
{
struct mdesc_handle *hp = mdesc_grab();
void *ret = NULL;
u64 mp;
mdesc_for_each_node_by_name(hp, mp, "cpu") {
const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
int cpuid = *id;
#ifdef CONFIG_SMP
if (cpuid >= NR_CPUS) {
printk(KERN_WARNING "Ignoring CPU %d which is "
">= NR_CPUS (%d)\n",
cpuid, NR_CPUS);
continue;
}
if (!cpumask_test_cpu(cpuid, mask))
continue;
#endif
ret = func(hp, mp, cpuid, arg);
if (ret)
goto out;
}
out:
mdesc_release(hp);
return ret;
}
static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
void *arg)
{
ncpus_probed++;
#ifdef CONFIG_SMP
set_cpu_present(cpuid, true);
#endif
return NULL;
}
void mdesc_populate_present_mask(cpumask_t *mask)
{
if (tlb_type != hypervisor)
return;
ncpus_probed = 0;
mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
}
static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
{
const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
unsigned long *pgsz_mask = arg;
u64 val;
val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
if (pgsz_prop)
val = *pgsz_prop;
if (!*pgsz_mask)
*pgsz_mask = val;
else
*pgsz_mask &= val;
return NULL;
}
void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
{
*pgsz_mask = 0;
mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
}
static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
void *arg)
{
const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
struct trap_per_cpu *tb;
cpuinfo_sparc *c;
u64 a;
#ifndef CONFIG_SMP
/* On uniprocessor we only want the values for the
* real physical cpu the kernel booted onto, however
* cpu_data() only has one entry at index 0.
*/
if (cpuid != real_hard_smp_processor_id())
return NULL;
cpuid = 0;
#endif
c = &cpu_data(cpuid);
c->clock_tick = *cfreq;
tb = &trap_block[cpuid];
get_mondo_data(hp, mp, tb);
mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
u64 j, t = mdesc_arc_target(hp, a);
const char *t_name;
t_name = mdesc_node_name(hp, t);
if (!strcmp(t_name, "cache")) {
fill_in_one_cache(c, hp, t);
continue;
}
mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
u64 n = mdesc_arc_target(hp, j);
const char *n_name;
n_name = mdesc_node_name(hp, n);
if (!strcmp(n_name, "cache"))
fill_in_one_cache(c, hp, n);
}
}
c->core_id = 0;
c->proc_id = -1;
return NULL;
}
void mdesc_fill_in_cpu_data(cpumask_t *mask)
{
struct mdesc_handle *hp;
mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
hp = mdesc_grab();
set_core_ids(hp);
set_proc_ids(hp);
mdesc_release(hp);
smp_fill_in_sib_core_maps();
}
/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
* opened. Hold this reference until /dev/mdesc is closed to ensure
* mdesc data structure is not released underneath us. Store the
* pointer to mdesc structure in private_data for read and seek to use
*/
static int mdesc_open(struct inode *inode, struct file *file)
{
struct mdesc_handle *hp = mdesc_grab();
if (!hp)
return -ENODEV;
file->private_data = hp;
return 0;
}
static ssize_t mdesc_read(struct file *file, char __user *buf,
size_t len, loff_t *offp)
{
struct mdesc_handle *hp = file->private_data;
unsigned char *mdesc;
int bytes_left, count = len;
if (*offp >= hp->handle_size)
return 0;
bytes_left = hp->handle_size - *offp;
if (count > bytes_left)
count = bytes_left;
mdesc = (unsigned char *)&hp->mdesc;
mdesc += *offp;
if (!copy_to_user(buf, mdesc, count)) {
*offp += count;
return count;
} else {
return -EFAULT;
}
}
static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
{
struct mdesc_handle *hp;
switch (whence) {
case SEEK_CUR:
offset += file->f_pos;
break;
case SEEK_SET:
break;
default:
return -EINVAL;
}
hp = file->private_data;
if (offset > hp->handle_size)
return -EINVAL;
else
file->f_pos = offset;
return offset;
}
/* mdesc_close() - /dev/mdesc is being closed, release the reference to
* mdesc structure.
*/
static int mdesc_close(struct inode *inode, struct file *file)
{
mdesc_release(file->private_data);
return 0;
}
static const struct file_operations mdesc_fops = {
.open = mdesc_open,
.read = mdesc_read,
.llseek = mdesc_llseek,
.release = mdesc_close,
.owner = THIS_MODULE,
};
static struct miscdevice mdesc_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "mdesc",
.fops = &mdesc_fops,
};
static int __init mdesc_misc_init(void)
{
return misc_register(&mdesc_misc);
}
__initcall(mdesc_misc_init);
void __init sun4v_mdesc_init(void)
{
struct mdesc_handle *hp;
unsigned long len, real_len, status;
(void) sun4v_mach_desc(0UL, 0UL, &len);
printk("MDESC: Size is %lu bytes.\n", len);
hp = mdesc_alloc(len, &memblock_mdesc_ops);
if (hp == NULL) {
prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
prom_halt();
}
status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
if (status != HV_EOK || real_len > len) {
prom_printf("sun4v_mach_desc fails, err(%lu), "
"len(%lu), real_len(%lu)\n",
status, len, real_len);
mdesc_free(hp);
prom_halt();
}
cur_mdesc = hp;
report_platform_properties();
}