usb: chipidea: udc: manage dynamic amount of tds with a linked list
Instead of having a limited number of usable tds in the udc we use a linked list to support dynamic amount of needed tds for all special gadget types. This improves throughput. Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik
Greg Kroah-Hartman
parent
20a677fd63
commit
cc9e6c495b
@ -162,6 +162,7 @@ static int ci_requests_show(struct seq_file *s, void *data)
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unsigned long flags;
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struct list_head *ptr = NULL;
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struct ci13xxx_req *req = NULL;
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struct td_node *node, *tmpnode;
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unsigned i, j, qsize = sizeof(struct ci13xxx_td)/sizeof(u32);
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if (ci->role != CI_ROLE_GADGET) {
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@ -174,13 +175,17 @@ static int ci_requests_show(struct seq_file *s, void *data)
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list_for_each(ptr, &ci->ci13xxx_ep[i].qh.queue) {
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req = list_entry(ptr, struct ci13xxx_req, queue);
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seq_printf(s, "EP=%02i: TD=%08X %s\n",
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i % (ci->hw_ep_max / 2), (u32)req->dma,
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((i < ci->hw_ep_max/2) ? "RX" : "TX"));
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list_for_each_entry_safe(node, tmpnode, &req->tds, td) {
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seq_printf(s, "EP=%02i: TD=%08X %s\n",
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i % (ci->hw_ep_max / 2),
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(u32)node->dma,
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((i < ci->hw_ep_max/2) ?
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"RX" : "TX"));
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for (j = 0; j < qsize; j++)
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seq_printf(s, " %04X: %08X\n", j,
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*((u32 *)req->ptr + j));
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for (j = 0; j < qsize; j++)
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seq_printf(s, " %04X: %08X\n", j,
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*((u32 *)node->ptr + j));
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}
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}
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spin_unlock_irqrestore(&ci->lock, flags);
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@ -368,6 +368,46 @@ static int hw_usb_reset(struct ci13xxx *ci)
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/******************************************************************************
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* UTIL block
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*****************************************************************************/
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static void setup_td_bits(struct td_node *tdnode, unsigned length)
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{
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memset(tdnode->ptr, 0, sizeof(*tdnode->ptr));
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tdnode->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
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tdnode->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
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tdnode->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
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}
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static int add_td_to_list(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq,
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unsigned length)
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{
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struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
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GFP_ATOMIC);
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if (node == NULL)
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return -ENOMEM;
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node->ptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
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&node->dma);
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if (node->ptr == NULL) {
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kfree(node);
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return -ENOMEM;
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}
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setup_td_bits(node, length);
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if (!list_empty(&mReq->tds)) {
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/* get the last entry */
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lastnode = list_entry(mReq->tds.prev,
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struct td_node, td);
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lastnode->ptr->next = cpu_to_le32(node->dma);
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}
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INIT_LIST_HEAD(&node->td);
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list_add_tail(&node->td, &mReq->tds);
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return 0;
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}
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/**
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* _usb_addr: calculates endpoint address from direction & number
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* @ep: endpoint
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@ -390,6 +430,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
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unsigned i;
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int ret = 0;
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unsigned length = mReq->req.length;
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struct td_node *firstnode, *lastnode;
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/* don't queue twice */
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if (mReq->req.status == -EALREADY)
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@ -397,58 +438,46 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
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mReq->req.status = -EALREADY;
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if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
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mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
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&mReq->zdma);
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if (mReq->zptr == NULL)
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return -ENOMEM;
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memset(mReq->zptr, 0, sizeof(*mReq->zptr));
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mReq->zptr->next = cpu_to_le32(TD_TERMINATE);
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mReq->zptr->token = cpu_to_le32(TD_STATUS_ACTIVE);
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if (!mReq->req.no_interrupt)
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mReq->zptr->token |= cpu_to_le32(TD_IOC);
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}
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ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
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if (ret)
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return ret;
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/*
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* TD configuration
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* TODO - handle requests which spawns into several TDs
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*/
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memset(mReq->ptr, 0, sizeof(*mReq->ptr));
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mReq->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
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mReq->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
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mReq->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
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if (mReq->zptr) {
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mReq->ptr->next = cpu_to_le32(mReq->zdma);
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} else {
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mReq->ptr->next = cpu_to_le32(TD_TERMINATE);
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if (!mReq->req.no_interrupt)
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mReq->ptr->token |= cpu_to_le32(TD_IOC);
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}
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mReq->ptr->page[0] = cpu_to_le32(mReq->req.dma);
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firstnode = list_first_entry(&mReq->tds,
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struct td_node, td);
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setup_td_bits(firstnode, length);
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firstnode->ptr->page[0] = cpu_to_le32(mReq->req.dma);
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for (i = 1; i < TD_PAGE_COUNT; i++) {
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u32 page = mReq->req.dma + i * CI13XXX_PAGE_SIZE;
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page &= ~TD_RESERVED_MASK;
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mReq->ptr->page[i] = cpu_to_le32(page);
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firstnode->ptr->page[i] = cpu_to_le32(page);
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}
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if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0))
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add_td_to_list(mEp, mReq, 0);
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lastnode = list_entry(mReq->tds.prev,
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struct td_node, td);
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lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
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if (!mReq->req.no_interrupt)
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lastnode->ptr->token |= cpu_to_le32(TD_IOC);
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wmb();
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if (!list_empty(&mEp->qh.queue)) {
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struct ci13xxx_req *mReqPrev;
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int n = hw_ep_bit(mEp->num, mEp->dir);
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int tmp_stat;
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u32 next = mReq->dma & TD_ADDR_MASK;
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struct td_node *prevlastnode;
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u32 next = firstnode->dma & TD_ADDR_MASK;
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mReqPrev = list_entry(mEp->qh.queue.prev,
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struct ci13xxx_req, queue);
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if (mReqPrev->zptr)
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mReqPrev->zptr->next = cpu_to_le32(next);
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else
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mReqPrev->ptr->next = cpu_to_le32(next);
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prevlastnode = list_entry(mReqPrev->tds.prev,
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struct td_node, td);
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prevlastnode->ptr->next = cpu_to_le32(next);
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wmb();
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if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
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goto done;
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@ -462,7 +491,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
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}
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/* QH configuration */
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mEp->qh.ptr->td.next = cpu_to_le32(mReq->dma); /* TERMINATE = 0 */
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mEp->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
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mEp->qh.ptr->td.token &=
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cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
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@ -491,19 +520,25 @@ done:
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*/
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static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
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{
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u32 tmptoken = le32_to_cpu(mReq->ptr->token);
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u32 tmptoken;
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struct td_node *node, *tmpnode, *firstnode;
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if (mReq->req.status != -EALREADY)
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return -EINVAL;
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if ((TD_STATUS_ACTIVE & tmptoken) != 0)
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return -EBUSY;
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firstnode = list_first_entry(&mReq->tds,
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struct td_node, td);
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if (mReq->zptr) {
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if ((cpu_to_le32(TD_STATUS_ACTIVE) & mReq->zptr->token) != 0)
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list_for_each_entry_safe(node, tmpnode, &mReq->tds, td) {
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tmptoken = le32_to_cpu(node->ptr->token);
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if ((TD_STATUS_ACTIVE & tmptoken) != 0)
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return -EBUSY;
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dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
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mReq->zptr = NULL;
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if (node != firstnode) {
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dma_pool_free(mEp->td_pool, node->ptr, node->dma);
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list_del_init(&node->td);
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node->ptr = NULL;
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kfree(node);
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}
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}
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mReq->req.status = 0;
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@ -537,6 +572,7 @@ static int _ep_nuke(struct ci13xxx_ep *mEp)
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__releases(mEp->lock)
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__acquires(mEp->lock)
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{
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struct td_node *node, *tmpnode, *firstnode;
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if (mEp == NULL)
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return -EINVAL;
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@ -549,9 +585,17 @@ __acquires(mEp->lock)
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list_entry(mEp->qh.queue.next,
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struct ci13xxx_req, queue);
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if (mReq->zptr) {
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dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
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mReq->zptr = NULL;
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firstnode = list_first_entry(&mReq->tds,
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struct td_node, td);
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list_for_each_entry_safe(node, tmpnode, &mReq->tds, td) {
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if (node != firstnode) {
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dma_pool_free(mEp->td_pool, node->ptr,
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node->dma);
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list_del_init(&node->td);
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node->ptr = NULL;
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kfree(node);
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}
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}
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list_del_init(&mReq->queue);
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@ -838,9 +882,13 @@ __acquires(mEp->lock)
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struct ci13xxx_req *mReq, *mReqTemp;
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struct ci13xxx_ep *mEpTemp = mEp;
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int retval = 0;
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struct td_node *firstnode;
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list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
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queue) {
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firstnode = list_first_entry(&mReq->tds,
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struct td_node, td);
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retval = _hardware_dequeue(mEp, mReq);
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if (retval < 0)
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break;
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@ -1143,19 +1191,26 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
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{
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struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
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struct ci13xxx_req *mReq = NULL;
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struct td_node *node;
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if (ep == NULL)
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return NULL;
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mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
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if (mReq != NULL) {
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node = kzalloc(sizeof(struct td_node), gfp_flags);
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if (mReq != NULL && node != NULL) {
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INIT_LIST_HEAD(&mReq->queue);
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INIT_LIST_HEAD(&mReq->tds);
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INIT_LIST_HEAD(&node->td);
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mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
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&mReq->dma);
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if (mReq->ptr == NULL) {
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node->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
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&node->dma);
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if (node->ptr == NULL) {
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kfree(node);
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kfree(mReq);
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mReq = NULL;
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} else {
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list_add_tail(&node->td, &mReq->tds);
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}
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}
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@ -1171,6 +1226,7 @@ static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
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{
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struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
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struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
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struct td_node *firstnode;
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unsigned long flags;
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if (ep == NULL || req == NULL) {
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@ -1182,8 +1238,11 @@ static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
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spin_lock_irqsave(mEp->lock, flags);
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if (mReq->ptr)
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dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
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firstnode = list_first_entry(&mReq->tds,
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struct td_node, td);
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if (firstnode->ptr)
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dma_pool_free(mEp->td_pool, firstnode->ptr, firstnode->dma);
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kfree(mReq);
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spin_unlock_irqrestore(mEp->lock, flags);
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@ -60,6 +60,12 @@ struct ci13xxx_qh {
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struct usb_ctrlrequest setup;
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} __attribute__ ((packed, aligned(4)));
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struct td_node {
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struct list_head td;
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dma_addr_t dma;
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struct ci13xxx_td *ptr;
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};
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/**
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* struct ci13xxx_req - usb request representation
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* @req: request structure for gadget drivers
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@ -72,10 +78,7 @@ struct ci13xxx_qh {
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struct ci13xxx_req {
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struct usb_request req;
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struct list_head queue;
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struct ci13xxx_td *ptr;
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dma_addr_t dma;
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struct ci13xxx_td *zptr;
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dma_addr_t zdma;
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struct list_head tds;
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};
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#ifdef CONFIG_USB_CHIPIDEA_UDC
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