470 lines
10 KiB
C
470 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2014-2015 Hisilicon Limited.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include "hnae.h"
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#define cls_to_ae_dev(dev) container_of(dev, struct hnae_ae_dev, cls_dev)
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static struct class *hnae_class;
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static void
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hnae_list_add(spinlock_t *lock, struct list_head *node, struct list_head *head)
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{
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unsigned long flags;
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spin_lock_irqsave(lock, flags);
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list_add_tail_rcu(node, head);
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spin_unlock_irqrestore(lock, flags);
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}
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static void hnae_list_del(spinlock_t *lock, struct list_head *node)
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{
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unsigned long flags;
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spin_lock_irqsave(lock, flags);
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list_del_rcu(node);
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spin_unlock_irqrestore(lock, flags);
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}
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static int hnae_alloc_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
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{
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unsigned int order = hnae_page_order(ring);
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struct page *p = dev_alloc_pages(order);
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if (!p)
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return -ENOMEM;
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cb->priv = p;
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cb->page_offset = 0;
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cb->reuse_flag = 0;
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cb->buf = page_address(p);
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cb->length = hnae_page_size(ring);
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cb->type = DESC_TYPE_PAGE;
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return 0;
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}
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static void hnae_free_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
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{
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if (unlikely(!cb->priv))
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return;
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if (cb->type == DESC_TYPE_SKB)
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dev_kfree_skb_any((struct sk_buff *)cb->priv);
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else if (unlikely(is_rx_ring(ring)))
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put_page((struct page *)cb->priv);
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cb->priv = NULL;
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}
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static int hnae_map_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
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{
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cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
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cb->length, ring_to_dma_dir(ring));
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if (dma_mapping_error(ring_to_dev(ring), cb->dma))
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return -EIO;
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return 0;
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}
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static void hnae_unmap_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
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{
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if (cb->type == DESC_TYPE_SKB)
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dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,
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ring_to_dma_dir(ring));
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else if (cb->length)
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dma_unmap_page(ring_to_dev(ring), cb->dma, cb->length,
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ring_to_dma_dir(ring));
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}
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static struct hnae_buf_ops hnae_bops = {
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.alloc_buffer = hnae_alloc_buffer,
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.free_buffer = hnae_free_buffer,
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.map_buffer = hnae_map_buffer,
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.unmap_buffer = hnae_unmap_buffer,
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};
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static int __ae_match(struct device *dev, const void *data)
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{
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struct hnae_ae_dev *hdev = cls_to_ae_dev(dev);
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if (dev_of_node(hdev->dev))
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return (data == &hdev->dev->of_node->fwnode);
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else if (is_acpi_node(hdev->dev->fwnode))
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return (data == hdev->dev->fwnode);
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dev_err(dev, "__ae_match cannot read cfg data from OF or acpi\n");
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return 0;
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}
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static struct hnae_ae_dev *find_ae(const struct fwnode_handle *fwnode)
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{
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struct device *dev;
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WARN_ON(!fwnode);
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dev = class_find_device(hnae_class, NULL, fwnode, __ae_match);
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return dev ? cls_to_ae_dev(dev) : NULL;
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}
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static void hnae_free_buffers(struct hnae_ring *ring)
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{
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int i;
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for (i = 0; i < ring->desc_num; i++)
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hnae_free_buffer_detach(ring, i);
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}
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/* Allocate memory for raw pkg, and map with dma */
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static int hnae_alloc_buffers(struct hnae_ring *ring)
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{
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int i, j, ret;
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for (i = 0; i < ring->desc_num; i++) {
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ret = hnae_alloc_buffer_attach(ring, i);
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if (ret)
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goto out_buffer_fail;
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}
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return 0;
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out_buffer_fail:
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for (j = i - 1; j >= 0; j--)
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hnae_free_buffer_detach(ring, j);
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return ret;
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}
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/* free desc along with its attached buffer */
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static void hnae_free_desc(struct hnae_ring *ring)
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{
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dma_unmap_single(ring_to_dev(ring), ring->desc_dma_addr,
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ring->desc_num * sizeof(ring->desc[0]),
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ring_to_dma_dir(ring));
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ring->desc_dma_addr = 0;
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kfree(ring->desc);
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ring->desc = NULL;
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}
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/* alloc desc, without buffer attached */
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static int hnae_alloc_desc(struct hnae_ring *ring)
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{
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int size = ring->desc_num * sizeof(ring->desc[0]);
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ring->desc = kzalloc(size, GFP_KERNEL);
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if (!ring->desc)
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return -ENOMEM;
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ring->desc_dma_addr = dma_map_single(ring_to_dev(ring),
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ring->desc, size, ring_to_dma_dir(ring));
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if (dma_mapping_error(ring_to_dev(ring), ring->desc_dma_addr)) {
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ring->desc_dma_addr = 0;
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kfree(ring->desc);
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ring->desc = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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/* fini ring, also free the buffer for the ring */
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static void hnae_fini_ring(struct hnae_ring *ring)
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{
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if (is_rx_ring(ring))
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hnae_free_buffers(ring);
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hnae_free_desc(ring);
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kfree(ring->desc_cb);
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ring->desc_cb = NULL;
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ring->next_to_clean = 0;
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ring->next_to_use = 0;
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}
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/* init ring, and with buffer for rx ring */
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static int
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hnae_init_ring(struct hnae_queue *q, struct hnae_ring *ring, int flags)
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{
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int ret;
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if (ring->desc_num <= 0 || ring->buf_size <= 0)
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return -EINVAL;
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ring->q = q;
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ring->flags = flags;
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spin_lock_init(&ring->lock);
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ring->coal_param = q->handle->coal_param;
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assert(!ring->desc && !ring->desc_cb && !ring->desc_dma_addr);
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/* not matter for tx or rx ring, the ntc and ntc start from 0 */
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assert(ring->next_to_use == 0);
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assert(ring->next_to_clean == 0);
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ring->desc_cb = kcalloc(ring->desc_num, sizeof(ring->desc_cb[0]),
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GFP_KERNEL);
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if (!ring->desc_cb) {
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ret = -ENOMEM;
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goto out;
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}
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ret = hnae_alloc_desc(ring);
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if (ret)
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goto out_with_desc_cb;
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if (is_rx_ring(ring)) {
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ret = hnae_alloc_buffers(ring);
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if (ret)
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goto out_with_desc;
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}
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return 0;
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out_with_desc:
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hnae_free_desc(ring);
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out_with_desc_cb:
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kfree(ring->desc_cb);
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ring->desc_cb = NULL;
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out:
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return ret;
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}
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static int hnae_init_queue(struct hnae_handle *h, struct hnae_queue *q,
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struct hnae_ae_dev *dev)
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{
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int ret;
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q->dev = dev;
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q->handle = h;
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ret = hnae_init_ring(q, &q->tx_ring, q->tx_ring.flags | RINGF_DIR);
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if (ret)
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goto out;
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ret = hnae_init_ring(q, &q->rx_ring, q->rx_ring.flags & ~RINGF_DIR);
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if (ret)
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goto out_with_tx_ring;
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if (dev->ops->init_queue)
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dev->ops->init_queue(q);
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return 0;
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out_with_tx_ring:
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hnae_fini_ring(&q->tx_ring);
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out:
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return ret;
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}
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static void hnae_fini_queue(struct hnae_queue *q)
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{
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if (q->dev->ops->fini_queue)
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q->dev->ops->fini_queue(q);
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hnae_fini_ring(&q->tx_ring);
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hnae_fini_ring(&q->rx_ring);
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}
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/**
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* ae_chain - define ae chain head
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*/
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static RAW_NOTIFIER_HEAD(ae_chain);
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int hnae_register_notifier(struct notifier_block *nb)
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{
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return raw_notifier_chain_register(&ae_chain, nb);
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}
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EXPORT_SYMBOL(hnae_register_notifier);
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void hnae_unregister_notifier(struct notifier_block *nb)
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{
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if (raw_notifier_chain_unregister(&ae_chain, nb))
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dev_err(NULL, "notifier chain unregister fail\n");
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}
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EXPORT_SYMBOL(hnae_unregister_notifier);
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int hnae_reinit_handle(struct hnae_handle *handle)
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{
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int i, j;
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int ret;
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for (i = 0; i < handle->q_num; i++) /* free ring*/
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hnae_fini_queue(handle->qs[i]);
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if (handle->dev->ops->reset)
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handle->dev->ops->reset(handle);
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for (i = 0; i < handle->q_num; i++) {/* reinit ring*/
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ret = hnae_init_queue(handle, handle->qs[i], handle->dev);
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if (ret)
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goto out_when_init_queue;
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}
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return 0;
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out_when_init_queue:
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for (j = i - 1; j >= 0; j--)
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hnae_fini_queue(handle->qs[j]);
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return ret;
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}
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EXPORT_SYMBOL(hnae_reinit_handle);
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/* hnae_get_handle - get a handle from the AE
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* @owner_dev: the dev use this handle
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* @ae_id: the id of the ae to be used
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* @ae_opts: the options set for the handle
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* @bops: the callbacks for buffer management
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*
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* return handle ptr or ERR_PTR
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*/
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struct hnae_handle *hnae_get_handle(struct device *owner_dev,
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const struct fwnode_handle *fwnode,
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u32 port_id,
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struct hnae_buf_ops *bops)
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{
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struct hnae_ae_dev *dev;
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struct hnae_handle *handle;
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int i, j;
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int ret;
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dev = find_ae(fwnode);
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if (!dev)
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return ERR_PTR(-ENODEV);
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handle = dev->ops->get_handle(dev, port_id);
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if (IS_ERR(handle)) {
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put_device(&dev->cls_dev);
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return handle;
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}
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handle->dev = dev;
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handle->owner_dev = owner_dev;
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handle->bops = bops ? bops : &hnae_bops;
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handle->eport_id = port_id;
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for (i = 0; i < handle->q_num; i++) {
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ret = hnae_init_queue(handle, handle->qs[i], dev);
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if (ret)
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goto out_when_init_queue;
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}
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__module_get(dev->owner);
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hnae_list_add(&dev->lock, &handle->node, &dev->handle_list);
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return handle;
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out_when_init_queue:
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for (j = i - 1; j >= 0; j--)
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hnae_fini_queue(handle->qs[j]);
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put_device(&dev->cls_dev);
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL(hnae_get_handle);
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void hnae_put_handle(struct hnae_handle *h)
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{
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struct hnae_ae_dev *dev = h->dev;
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int i;
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for (i = 0; i < h->q_num; i++)
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hnae_fini_queue(h->qs[i]);
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if (h->dev->ops->reset)
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h->dev->ops->reset(h);
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hnae_list_del(&dev->lock, &h->node);
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if (dev->ops->put_handle)
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dev->ops->put_handle(h);
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module_put(dev->owner);
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put_device(&dev->cls_dev);
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}
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EXPORT_SYMBOL(hnae_put_handle);
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static void hnae_release(struct device *dev)
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{
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}
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/**
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* hnae_ae_register - register a AE engine to hnae framework
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* @hdev: the hnae ae engine device
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* @owner: the module who provides this dev
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* NOTE: the duplicated name will not be checked
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*/
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int hnae_ae_register(struct hnae_ae_dev *hdev, struct module *owner)
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{
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static atomic_t id = ATOMIC_INIT(-1);
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int ret;
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if (!hdev->dev)
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return -ENODEV;
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if (!hdev->ops || !hdev->ops->get_handle ||
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!hdev->ops->toggle_ring_irq ||
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!hdev->ops->get_status || !hdev->ops->adjust_link)
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return -EINVAL;
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hdev->owner = owner;
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hdev->id = (int)atomic_inc_return(&id);
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hdev->cls_dev.parent = hdev->dev;
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hdev->cls_dev.class = hnae_class;
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hdev->cls_dev.release = hnae_release;
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(void)dev_set_name(&hdev->cls_dev, "hnae%d", hdev->id);
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ret = device_register(&hdev->cls_dev);
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if (ret)
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return ret;
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__module_get(THIS_MODULE);
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INIT_LIST_HEAD(&hdev->handle_list);
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spin_lock_init(&hdev->lock);
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ret = raw_notifier_call_chain(&ae_chain, HNAE_AE_REGISTER, NULL);
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if (ret)
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dev_dbg(hdev->dev,
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"has not notifier for AE: %s\n", hdev->name);
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return 0;
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}
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EXPORT_SYMBOL(hnae_ae_register);
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/**
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* hnae_ae_unregister - unregisters a HNAE AE engine
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* @cdev: the device to unregister
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*/
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void hnae_ae_unregister(struct hnae_ae_dev *hdev)
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{
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device_unregister(&hdev->cls_dev);
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module_put(THIS_MODULE);
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}
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EXPORT_SYMBOL(hnae_ae_unregister);
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static int __init hnae_init(void)
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{
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hnae_class = class_create(THIS_MODULE, "hnae");
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return PTR_ERR_OR_ZERO(hnae_class);
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}
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static void __exit hnae_exit(void)
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{
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class_destroy(hnae_class);
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}
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subsys_initcall(hnae_init);
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module_exit(hnae_exit);
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MODULE_AUTHOR("Hisilicon, Inc.");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");
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/* vi: set tw=78 noet: */
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