- 根目录:
- arch
- tile
- gxio
- mpipe.c
/*
* Copyright 2012 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
/*
* Implementation of mpipe gxio calls.
*/
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>
#include <gxio/iorpc_globals.h>
#include <gxio/iorpc_mpipe.h>
#include <gxio/iorpc_mpipe_info.h>
#include <gxio/kiorpc.h>
#include <gxio/mpipe.h>
/* HACK: Avoid pointless "shadow" warnings. */
#define link link_shadow
/**
* strscpy - Copy a C-string into a sized buffer, but only if it fits
* @dest: Where to copy the string to
* @src: Where to copy the string from
* @size: size of destination buffer
*
* Use this routine to avoid copying too-long strings.
* The routine returns the total number of bytes copied
* (including the trailing NUL) or zero if the buffer wasn't
* big enough. To ensure that programmers pay attention
* to the return code, the destination has a single NUL
* written at the front (if size is non-zero) when the
* buffer is not big enough.
*/
static size_t strscpy(char *dest, const char *src, size_t size)
{
size_t len = strnlen(src, size) + 1;
if (len > size) {
if (size)
dest[0] = '\0';
return 0;
}
memcpy(dest, src, len);
return len;
}
int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
{
char file[32];
int fd;
int i;
if (mpipe_index >= GXIO_MPIPE_INSTANCE_MAX)
return -EINVAL;
snprintf(file, sizeof(file), "mpipe/%d/iorpc", mpipe_index);
fd = hv_dev_open((HV_VirtAddr) file, 0);
context->fd = fd;
if (fd < 0) {
if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
return fd;
else
return -ENODEV;
}
/* Map in the MMIO space. */
context->mmio_cfg_base = (void __force *)
iorpc_ioremap(fd, HV_MPIPE_CONFIG_MMIO_OFFSET,
HV_MPIPE_CONFIG_MMIO_SIZE);
if (context->mmio_cfg_base == NULL)
goto cfg_failed;
context->mmio_fast_base = (void __force *)
iorpc_ioremap(fd, HV_MPIPE_FAST_MMIO_OFFSET,
HV_MPIPE_FAST_MMIO_SIZE);
if (context->mmio_fast_base == NULL)
goto fast_failed;
/* Initialize the stacks. */
for (i = 0; i < 8; i++)
context->__stacks.stacks[i] = 255;
context->instance = mpipe_index;
return 0;
fast_failed:
iounmap((void __force __iomem *)(context->mmio_cfg_base));
cfg_failed:
hv_dev_close(context->fd);
context->fd = -1;
return -ENODEV;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_init);
int gxio_mpipe_destroy(gxio_mpipe_context_t *context)
{
iounmap((void __force __iomem *)(context->mmio_cfg_base));
iounmap((void __force __iomem *)(context->mmio_fast_base));
return hv_dev_close(context->fd);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_destroy);
static int16_t gxio_mpipe_buffer_sizes[8] =
{ 128, 256, 512, 1024, 1664, 4096, 10368, 16384 };
gxio_mpipe_buffer_size_enum_t gxio_mpipe_buffer_size_to_buffer_size_enum(size_t
size)
{
int i;
for (i = 0; i < 7; i++)
if (size <= gxio_mpipe_buffer_sizes[i])
break;
return i;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_to_buffer_size_enum);
size_t gxio_mpipe_buffer_size_enum_to_buffer_size(gxio_mpipe_buffer_size_enum_t
buffer_size_enum)
{
if (buffer_size_enum > 7)
buffer_size_enum = 7;
return gxio_mpipe_buffer_sizes[buffer_size_enum];
}
EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_enum_to_buffer_size);
size_t gxio_mpipe_calc_buffer_stack_bytes(unsigned long buffers)
{
const int BUFFERS_PER_LINE = 12;
/* Count the number of cachlines. */
unsigned long lines =
(buffers + BUFFERS_PER_LINE - 1) / BUFFERS_PER_LINE;
/* Convert to bytes. */
return lines * CHIP_L2_LINE_SIZE();
}
EXPORT_SYMBOL_GPL(gxio_mpipe_calc_buffer_stack_bytes);
int gxio_mpipe_init_buffer_stack(gxio_mpipe_context_t *context,
unsigned int stack,
gxio_mpipe_buffer_size_enum_t
buffer_size_enum, void *mem, size_t mem_size,
unsigned int mem_flags)
{
int result;
memset(mem, 0, mem_size);
result = gxio_mpipe_init_buffer_stack_aux(context, mem, mem_size,
mem_flags, stack,
buffer_size_enum);
if (result < 0)
return result;
/* Save the stack. */
context->__stacks.stacks[buffer_size_enum] = stack;
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_init_buffer_stack);
int gxio_mpipe_init_notif_ring(gxio_mpipe_context_t *context,
unsigned int ring,
void *mem, size_t mem_size,
unsigned int mem_flags)
{
return gxio_mpipe_init_notif_ring_aux(context, mem, mem_size,
mem_flags, ring);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_ring);
int gxio_mpipe_init_notif_group_and_buckets(gxio_mpipe_context_t *context,
unsigned int group,
unsigned int ring,
unsigned int num_rings,
unsigned int bucket,
unsigned int num_buckets,
gxio_mpipe_bucket_mode_t mode)
{
int i;
int result;
gxio_mpipe_bucket_info_t bucket_info = { {
.group = group,
.mode = mode,
}
};
gxio_mpipe_notif_group_bits_t bits = { {0} };
for (i = 0; i < num_rings; i++)
gxio_mpipe_notif_group_add_ring(&bits, ring + i);
result = gxio_mpipe_init_notif_group(context, group, bits);
if (result != 0)
return result;
for (i = 0; i < num_buckets; i++) {
bucket_info.notifring = ring + (i % num_rings);
result = gxio_mpipe_init_bucket(context, bucket + i,
bucket_info);
if (result != 0)
return result;
}
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_group_and_buckets);
int gxio_mpipe_init_edma_ring(gxio_mpipe_context_t *context,
unsigned int ring, unsigned int channel,
void *mem, size_t mem_size,
unsigned int mem_flags)
{
memset(mem, 0, mem_size);
return gxio_mpipe_init_edma_ring_aux(context, mem, mem_size, mem_flags,
ring, channel);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_init_edma_ring);
void gxio_mpipe_rules_init(gxio_mpipe_rules_t *rules,
gxio_mpipe_context_t *context)
{
rules->context = context;
memset(&rules->list, 0, sizeof(rules->list));
}
EXPORT_SYMBOL_GPL(gxio_mpipe_rules_init);
int gxio_mpipe_rules_begin(gxio_mpipe_rules_t *rules,
unsigned int bucket, unsigned int num_buckets,
gxio_mpipe_rules_stacks_t *stacks)
{
int i;
int stack = 255;
gxio_mpipe_rules_list_t *list = &rules->list;
/* Current rule. */
gxio_mpipe_rules_rule_t *rule =
(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
unsigned int head = list->tail;
/*
* Align next rule properly.
*Note that "dmacs_and_vlans" will also be aligned.
*/
unsigned int pad = 0;
while (((head + pad) % __alignof__(gxio_mpipe_rules_rule_t)) != 0)
pad++;
/*
* Verify room.
* ISSUE: Mark rules as broken on error?
*/
if (head + pad + sizeof(*rule) >= sizeof(list->rules))
return GXIO_MPIPE_ERR_RULES_FULL;
/* Verify num_buckets is a power of 2. */
if (__builtin_popcount(num_buckets) != 1)
return GXIO_MPIPE_ERR_RULES_INVALID;
/* Add padding to previous rule. */
rule->size += pad;
/* Start a new rule. */
list->head = head + pad;
rule = (gxio_mpipe_rules_rule_t *) (list->rules + list->head);
/* Default some values. */
rule->headroom = 2;
rule->tailroom = 0;
rule->capacity = 16384;
/* Save the bucket info. */
rule->bucket_mask = num_buckets - 1;
rule->bucket_first = bucket;
for (i = 8 - 1; i >= 0; i--) {
int maybe =
stacks ? stacks->stacks[i] : rules->context->__stacks.
stacks[i];
if (maybe != 255)
stack = maybe;
rule->stacks.stacks[i] = stack;
}
if (stack == 255)
return GXIO_MPIPE_ERR_RULES_INVALID;
/* NOTE: Only entries at the end of the array can be 255. */
for (i = 8 - 1; i > 0; i--) {
if (rule->stacks.stacks[i] == 255) {
rule->stacks.stacks[i] = stack;
rule->capacity =
gxio_mpipe_buffer_size_enum_to_buffer_size(i -
1);
}
}
rule->size = sizeof(*rule);
list->tail = list->head + rule->size;
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_rules_begin);
int gxio_mpipe_rules_add_channel(gxio_mpipe_rules_t *rules,
unsigned int channel)
{
gxio_mpipe_rules_list_t *list = &rules->list;
gxio_mpipe_rules_rule_t *rule =
(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
/* Verify channel. */
if (channel >= 32)
return GXIO_MPIPE_ERR_RULES_INVALID;
/* Verify begun. */
if (list->tail == 0)
return GXIO_MPIPE_ERR_RULES_EMPTY;
rule->channel_bits |= (1UL << channel);
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_rules_add_channel);
int gxio_mpipe_rules_set_headroom(gxio_mpipe_rules_t *rules, uint8_t headroom)
{
gxio_mpipe_rules_list_t *list = &rules->list;
gxio_mpipe_rules_rule_t *rule =
(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
/* Verify begun. */
if (list->tail == 0)
return GXIO_MPIPE_ERR_RULES_EMPTY;
rule->headroom = headroom;
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_rules_set_headroom);
int gxio_mpipe_rules_commit(gxio_mpipe_rules_t *rules)
{
gxio_mpipe_rules_list_t *list = &rules->list;
unsigned int size =
offsetof(gxio_mpipe_rules_list_t, rules) + list->tail;
return gxio_mpipe_commit_rules(rules->context, list, size);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_rules_commit);
int gxio_mpipe_iqueue_init(gxio_mpipe_iqueue_t *iqueue,
gxio_mpipe_context_t *context,
unsigned int ring,
void *mem, size_t mem_size, unsigned int mem_flags)
{
/* The init call below will verify that "mem_size" is legal. */
unsigned int num_entries = mem_size / sizeof(gxio_mpipe_idesc_t);
iqueue->context = context;
iqueue->idescs = (gxio_mpipe_idesc_t *)mem;
iqueue->ring = ring;
iqueue->num_entries = num_entries;
iqueue->mask_num_entries = num_entries - 1;
iqueue->log2_num_entries = __builtin_ctz(num_entries);
iqueue->head = 1;
#ifdef __BIG_ENDIAN__
iqueue->swapped = 0;
#endif
/* Initialize the "tail". */
__gxio_mmio_write(mem, iqueue->head);
return gxio_mpipe_init_notif_ring(context, ring, mem, mem_size,
mem_flags);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_iqueue_init);
int gxio_mpipe_equeue_init(gxio_mpipe_equeue_t *equeue,
gxio_mpipe_context_t *context,
unsigned int ering,
unsigned int channel,
void *mem, unsigned int mem_size,
unsigned int mem_flags)
{
/* The init call below will verify that "mem_size" is legal. */
unsigned int num_entries = mem_size / sizeof(gxio_mpipe_edesc_t);
/* Offset used to read number of completed commands. */
MPIPE_EDMA_POST_REGION_ADDR_t offset;
int result = gxio_mpipe_init_edma_ring(context, ering, channel,
mem, mem_size, mem_flags);
if (result < 0)
return result;
memset(equeue, 0, sizeof(*equeue));
offset.word = 0;
offset.region =
MPIPE_MMIO_ADDR__REGION_VAL_EDMA -
MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
offset.ring = ering;
__gxio_dma_queue_init(&equeue->dma_queue,
context->mmio_fast_base + offset.word,
num_entries);
equeue->edescs = mem;
equeue->mask_num_entries = num_entries - 1;
equeue->log2_num_entries = __builtin_ctz(num_entries);
equeue->context = context;
equeue->ering = ering;
equeue->channel = channel;
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_equeue_init);
int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
const struct timespec64 *ts)
{
cycles_t cycles = get_cycles();
return gxio_mpipe_set_timestamp_aux(context, (uint64_t)ts->tv_sec,
(uint64_t)ts->tv_nsec,
(uint64_t)cycles);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_set_timestamp);
int gxio_mpipe_get_timestamp(gxio_mpipe_context_t *context,
struct timespec64 *ts)
{
int ret;
cycles_t cycles_prev, cycles_now, clock_rate;
cycles_prev = get_cycles();
ret = gxio_mpipe_get_timestamp_aux(context, (uint64_t *)&ts->tv_sec,
(uint64_t *)&ts->tv_nsec,
(uint64_t *)&cycles_now);
if (ret < 0) {
return ret;
}
clock_rate = get_clock_rate();
ts->tv_nsec -= (cycles_now - cycles_prev) * 1000000000LL / clock_rate;
if (ts->tv_nsec < 0) {
ts->tv_nsec += 1000000000LL;
ts->tv_sec -= 1;
}
return ret;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_get_timestamp);
int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context, int64_t delta)
{
return gxio_mpipe_adjust_timestamp_aux(context, delta);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_adjust_timestamp);
/* Get our internal context used for link name access. This context is
* special in that it is not associated with an mPIPE service domain.
*/
static gxio_mpipe_context_t *_gxio_get_link_context(void)
{
static gxio_mpipe_context_t context;
static gxio_mpipe_context_t *contextp;
static int tried_open = 0;
static DEFINE_MUTEX(mutex);
mutex_lock(&mutex);
if (!tried_open) {
int i = 0;
tried_open = 1;
/*
* "4" here is the maximum possible number of mPIPE shims; it's
* an exaggeration but we shouldn't ever go beyond 2 anyway.
*/
for (i = 0; i < 4; i++) {
char file[80];
snprintf(file, sizeof(file), "mpipe/%d/iorpc_info", i);
context.fd = hv_dev_open((HV_VirtAddr) file, 0);
if (context.fd < 0)
continue;
contextp = &context;
break;
}
}
mutex_unlock(&mutex);
return contextp;
}
int gxio_mpipe_link_instance(const char *link_name)
{
_gxio_mpipe_link_name_t name;
gxio_mpipe_context_t *context = _gxio_get_link_context();
if (!context)
return GXIO_ERR_NO_DEVICE;
if (strscpy(name.name, link_name, sizeof(name.name)) == 0)
return GXIO_ERR_NO_DEVICE;
return gxio_mpipe_info_instance_aux(context, name);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_instance);
int gxio_mpipe_link_enumerate_mac(int idx, char *link_name, uint8_t *link_mac)
{
int rv;
_gxio_mpipe_link_name_t name;
_gxio_mpipe_link_mac_t mac;
gxio_mpipe_context_t *context = _gxio_get_link_context();
if (!context)
return GXIO_ERR_NO_DEVICE;
rv = gxio_mpipe_info_enumerate_aux(context, idx, &name, &mac);
if (rv >= 0) {
if (strscpy(link_name, name.name, sizeof(name.name)) == 0)
return GXIO_ERR_INVAL_MEMORY_SIZE;
memcpy(link_mac, mac.mac, sizeof(mac.mac));
}
return rv;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_enumerate_mac);
int gxio_mpipe_link_open(gxio_mpipe_link_t *link,
gxio_mpipe_context_t *context, const char *link_name,
unsigned int flags)
{
_gxio_mpipe_link_name_t name;
int rv;
if (strscpy(name.name, link_name, sizeof(name.name)) == 0)
return GXIO_ERR_NO_DEVICE;
rv = gxio_mpipe_link_open_aux(context, name, flags);
if (rv < 0)
return rv;
link->context = context;
link->channel = rv >> 8;
link->mac = rv & 0xFF;
return 0;
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_open);
int gxio_mpipe_link_close(gxio_mpipe_link_t *link)
{
return gxio_mpipe_link_close_aux(link->context, link->mac);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_close);
int gxio_mpipe_link_set_attr(gxio_mpipe_link_t *link, uint32_t attr,
int64_t val)
{
return gxio_mpipe_link_set_attr_aux(link->context, link->mac, attr,
val);
}
EXPORT_SYMBOL_GPL(gxio_mpipe_link_set_attr);