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-rw-r--r--arch/tile/gxio/mpipe.c545
1 files changed, 545 insertions, 0 deletions
diff --git a/arch/tile/gxio/mpipe.c b/arch/tile/gxio/mpipe.c
new file mode 100644
index 0000000..e71c633
--- /dev/null
+++ b/arch/tile/gxio/mpipe.c
@@ -0,0 +1,545 @@
+/*
+ * 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
+
+int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
+{
+ char file[32];
+
+ int fd;
+ int i;
+
+ snprintf(file, sizeof(file), "mpipe/%d/iorpc", mpipe_index);
+ fd = hv_dev_open((HV_VirtAddr) file, 0);
+ if (fd < 0) {
+ if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
+ return fd;
+ else
+ return -ENODEV;
+ }
+
+ context->fd = fd;
+
+ /* 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;
+
+ return 0;
+
+ fast_failed:
+ iounmap((void __force __iomem *)(context->mmio_cfg_base));
+ cfg_failed:
+ hv_dev_close(context->fd);
+ 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 edma_ring_id,
+ 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, edma_ring_id, 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 = edma_ring_id;
+
+ __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);
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_equeue_init);
+
+int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
+ const struct timespec *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);
+}
+
+int gxio_mpipe_get_timestamp(gxio_mpipe_context_t *context,
+ struct timespec *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;
+}
+
+int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context, int64_t delta)
+{
+ return gxio_mpipe_adjust_timestamp_aux(context, delta);
+}
+
+/* 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_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) {
+ strncpy(link_name, name.name, sizeof(name.name));
+ 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;
+
+ strncpy(name.name, link_name, sizeof(name.name));
+ name.name[GXIO_MPIPE_LINK_NAME_LEN - 1] = '\0';
+
+ 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);