1 files changed, 398 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_srq.c b/drivers/infiniband/hw/hns/hns_roce_srq.c
new file mode 100644
index 000000000..02e2416b5
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_srq.c
@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2018 Hisilicon Limited.
+ */
+
+#include <rdma/ib_umem.h>
+#include <rdma/hns-abi.h>
+#include "hns_roce_device.h"
+#include "hns_roce_cmd.h"
+#include "hns_roce_hem.h"
+
+void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type)
+{
+	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
+	struct hns_roce_srq *srq;
+
+	xa_lock(&srq_table->xa);
+	srq = xa_load(&srq_table->xa, srqn & (hr_dev->caps.num_srqs - 1));
+	if (srq)
+		atomic_inc(&srq->refcount);
+	xa_unlock(&srq_table->xa);
+
+	if (!srq) {
+		dev_warn(hr_dev->dev, "Async event for bogus SRQ %08x\n", srqn);
+		return;
+	}
+
+	srq->event(srq, event_type);
+
+	if (atomic_dec_and_test(&srq->refcount))
+		complete(&srq->free);
+}
+
+static void hns_roce_ib_srq_event(struct hns_roce_srq *srq,
+				  enum hns_roce_event event_type)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
+	struct ib_srq *ibsrq = &srq->ibsrq;
+	struct ib_event event;
+
+	if (ibsrq->event_handler) {
+		event.device      = ibsrq->device;
+		event.element.srq = ibsrq;
+		switch (event_type) {
+		case HNS_ROCE_EVENT_TYPE_SRQ_LIMIT_REACH:
+			event.event = IB_EVENT_SRQ_LIMIT_REACHED;
+			break;
+		case HNS_ROCE_EVENT_TYPE_SRQ_CATAS_ERROR:
+			event.event = IB_EVENT_SRQ_ERR;
+			break;
+		default:
+			dev_err(hr_dev->dev,
+			   "hns_roce:Unexpected event type 0x%x on SRQ %06lx\n",
+			   event_type, srq->srqn);
+			return;
+		}
+
+		ibsrq->event_handler(&event, ibsrq->srq_context);
+	}
+}
+
+static int hns_roce_hw_create_srq(struct hns_roce_dev *dev,
+				  struct hns_roce_cmd_mailbox *mailbox,
+				  unsigned long srq_num)
+{
+	return hns_roce_cmd_mbox(dev, mailbox->dma, 0, srq_num, 0,
+				 HNS_ROCE_CMD_CREATE_SRQ,
+				 HNS_ROCE_CMD_TIMEOUT_MSECS);
+}
+
+static int hns_roce_hw_destroy_srq(struct hns_roce_dev *dev,
+				   struct hns_roce_cmd_mailbox *mailbox,
+				   unsigned long srq_num)
+{
+	return hns_roce_cmd_mbox(dev, 0, mailbox ? mailbox->dma : 0, srq_num,
+				 mailbox ? 0 : 1, HNS_ROCE_CMD_DESTROY_SRQ,
+				 HNS_ROCE_CMD_TIMEOUT_MSECS);
+}
+
+static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
+		      u32 pdn, u32 cqn, u16 xrcd, u64 db_rec_addr)
+{
+	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_cmd_mailbox *mailbox;
+	u64 mtts_wqe[MTT_MIN_COUNT] = { 0 };
+	u64 mtts_idx[MTT_MIN_COUNT] = { 0 };
+	dma_addr_t dma_handle_wqe = 0;
+	dma_addr_t dma_handle_idx = 0;
+	int ret;
+
+	/* Get the physical address of srq buf */
+	ret = hns_roce_mtr_find(hr_dev, &srq->buf_mtr, 0, mtts_wqe,
+				ARRAY_SIZE(mtts_wqe), &dma_handle_wqe);
+	if (ret < 1) {
+		ibdev_err(ibdev, "failed to find mtr for SRQ WQE, ret = %d.\n",
+			  ret);
+		return -ENOBUFS;
+	}
+
+	/* Get physical address of idx que buf */
+	ret = hns_roce_mtr_find(hr_dev, &srq->idx_que.mtr, 0, mtts_idx,
+				ARRAY_SIZE(mtts_idx), &dma_handle_idx);
+	if (ret < 1) {
+		ibdev_err(ibdev, "failed to find mtr for SRQ idx, ret = %d.\n",
+			  ret);
+		return -ENOBUFS;
+	}
+
+	ret = hns_roce_bitmap_alloc(&srq_table->bitmap, &srq->srqn);
+	if (ret) {
+		ibdev_err(ibdev,
+			  "failed to alloc SRQ number, ret = %d.\n", ret);
+		return -ENOMEM;
+	}
+
+	ret = hns_roce_table_get(hr_dev, &srq_table->table, srq->srqn);
+	if (ret) {
+		ibdev_err(ibdev, "failed to get SRQC table, ret = %d.\n", ret);
+		goto err_out;
+	}
+
+	ret = xa_err(xa_store(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
+	if (ret) {
+		ibdev_err(ibdev, "failed to store SRQC, ret = %d.\n", ret);
+		goto err_put;
+	}
+
+	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
+	if (IS_ERR_OR_NULL(mailbox)) {
+		ret = -ENOMEM;
+		ibdev_err(ibdev, "failed to alloc mailbox for SRQC.\n");
+		goto err_xa;
+	}
+
+	hr_dev->hw->write_srqc(hr_dev, srq, pdn, xrcd, cqn, mailbox->buf,
+			       mtts_wqe, mtts_idx, dma_handle_wqe,
+			       dma_handle_idx);
+
+	ret = hns_roce_hw_create_srq(hr_dev, mailbox, srq->srqn);
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+	if (ret) {
+		ibdev_err(ibdev, "failed to config SRQC, ret = %d.\n", ret);
+		goto err_xa;
+	}
+
+	atomic_set(&srq->refcount, 1);
+	init_completion(&srq->free);
+	return ret;
+
+err_xa:
+	xa_erase(&srq_table->xa, srq->srqn);
+
+err_put:
+	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
+
+err_out:
+	hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
+	return ret;
+}
+
+static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
+{
+	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
+	int ret;
+
+	ret = hns_roce_hw_destroy_srq(hr_dev, NULL, srq->srqn);
+	if (ret)
+		dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
+			ret, srq->srqn);
+
+	xa_erase(&srq_table->xa, srq->srqn);
+
+	if (atomic_dec_and_test(&srq->refcount))
+		complete(&srq->free);
+	wait_for_completion(&srq->free);
+
+	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
+	hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
+}
+
+static int alloc_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
+			 struct ib_udata *udata, unsigned long addr)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_buf_attr buf_attr = {};
+	int err;
+
+	srq->wqe_shift = ilog2(roundup_pow_of_two(max(HNS_ROCE_SGE_SIZE,
+						      HNS_ROCE_SGE_SIZE *
+						      srq->max_gs)));
+
+	buf_attr.page_shift = hr_dev->caps.srqwqe_buf_pg_sz + HNS_HW_PAGE_SHIFT;
+	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
+							 srq->wqe_shift);
+	buf_attr.region[0].hopnum = hr_dev->caps.srqwqe_hop_num;
+	buf_attr.region_count = 1;
+	buf_attr.fixed_page = true;
+
+	err = hns_roce_mtr_create(hr_dev, &srq->buf_mtr, &buf_attr,
+				  hr_dev->caps.srqwqe_ba_pg_sz +
+				  HNS_HW_PAGE_SHIFT, udata, addr);
+	if (err)
+		ibdev_err(ibdev,
+			  "failed to alloc SRQ buf mtr, ret = %d.\n", err);
+
+	return err;
+}
+
+static void free_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
+{
+	hns_roce_mtr_destroy(hr_dev, &srq->buf_mtr);
+}
+
+static int alloc_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
+			 struct ib_udata *udata, unsigned long addr)
+{
+	struct hns_roce_idx_que *idx_que = &srq->idx_que;
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_buf_attr buf_attr = {};
+	int err;
+
+	srq->idx_que.entry_shift = ilog2(HNS_ROCE_IDX_QUE_ENTRY_SZ);
+
+	buf_attr.page_shift = hr_dev->caps.idx_buf_pg_sz + HNS_HW_PAGE_SHIFT;
+	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
+					srq->idx_que.entry_shift);
+	buf_attr.region[0].hopnum = hr_dev->caps.idx_hop_num;
+	buf_attr.region_count = 1;
+	buf_attr.fixed_page = true;
+
+	err = hns_roce_mtr_create(hr_dev, &idx_que->mtr, &buf_attr,
+				  hr_dev->caps.idx_ba_pg_sz + HNS_HW_PAGE_SHIFT,
+				  udata, addr);
+	if (err) {
+		ibdev_err(ibdev,
+			  "failed to alloc SRQ idx mtr, ret = %d.\n", err);
+		return err;
+	}
+
+	if (!udata) {
+		idx_que->bitmap = bitmap_zalloc(srq->wqe_cnt, GFP_KERNEL);
+		if (!idx_que->bitmap) {
+			ibdev_err(ibdev, "failed to alloc SRQ idx bitmap.\n");
+			err = -ENOMEM;
+			goto err_idx_mtr;
+		}
+	}
+
+	return 0;
+err_idx_mtr:
+	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
+
+	return err;
+}
+
+static void free_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
+{
+	struct hns_roce_idx_que *idx_que = &srq->idx_que;
+
+	bitmap_free(idx_que->bitmap);
+	idx_que->bitmap = NULL;
+	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
+}
+
+static int alloc_srq_wrid(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
+{
+	srq->head = 0;
+	srq->tail = srq->wqe_cnt - 1;
+	srq->wrid = kvmalloc_array(srq->wqe_cnt, sizeof(u64), GFP_KERNEL);
+	if (!srq->wrid)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void free_srq_wrid(struct hns_roce_srq *srq)
+{
+	kvfree(srq->wrid);
+	srq->wrid = NULL;
+}
+
+int hns_roce_create_srq(struct ib_srq *ib_srq,
+			struct ib_srq_init_attr *init_attr,
+			struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ib_srq->device);
+	struct hns_roce_ib_create_srq_resp resp = {};
+	struct hns_roce_srq *srq = to_hr_srq(ib_srq);
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_ib_create_srq ucmd = {};
+	int ret;
+	u32 cqn;
+
+	/* Check the actual SRQ wqe and SRQ sge num */
+	if (init_attr->attr.max_wr >= hr_dev->caps.max_srq_wrs ||
+	    init_attr->attr.max_sge > hr_dev->caps.max_srq_sges)
+		return -EINVAL;
+
+	mutex_init(&srq->mutex);
+	spin_lock_init(&srq->lock);
+
+	srq->wqe_cnt = roundup_pow_of_two(init_attr->attr.max_wr + 1);
+	srq->max_gs = init_attr->attr.max_sge;
+
+	if (udata) {
+		ret = ib_copy_from_udata(&ucmd, udata,
+					 min(udata->inlen, sizeof(ucmd)));
+		if (ret) {
+			ibdev_err(ibdev, "failed to copy SRQ udata, ret = %d.\n",
+				  ret);
+			return ret;
+		}
+	}
+
+	ret = alloc_srq_buf(hr_dev, srq, udata, ucmd.buf_addr);
+	if (ret) {
+		ibdev_err(ibdev,
+			  "failed to alloc SRQ buffer, ret = %d.\n", ret);
+		return ret;
+	}
+
+	ret = alloc_srq_idx(hr_dev, srq, udata, ucmd.que_addr);
+	if (ret) {
+		ibdev_err(ibdev, "failed to alloc SRQ idx, ret = %d.\n", ret);
+		goto err_buf_alloc;
+	}
+
+	if (!udata) {
+		ret = alloc_srq_wrid(hr_dev, srq);
+		if (ret) {
+			ibdev_err(ibdev, "failed to alloc SRQ wrid, ret = %d.\n",
+				  ret);
+			goto err_idx_alloc;
+		}
+	}
+
+	cqn = ib_srq_has_cq(init_attr->srq_type) ?
+	      to_hr_cq(init_attr->ext.cq)->cqn : 0;
+	srq->db_reg_l = hr_dev->reg_base + SRQ_DB_REG;
+
+	ret = alloc_srqc(hr_dev, srq, to_hr_pd(ib_srq->pd)->pdn, cqn, 0, 0);
+	if (ret) {
+		ibdev_err(ibdev,
+			  "failed to alloc SRQ context, ret = %d.\n", ret);
+		goto err_wrid_alloc;
+	}
+
+	srq->event = hns_roce_ib_srq_event;
+	resp.srqn = srq->srqn;
+
+	if (udata) {
+		ret = ib_copy_to_udata(udata, &resp,
+				       min(udata->outlen, sizeof(resp)));
+		if (ret)
+			goto err_srqc_alloc;
+	}
+
+	return 0;
+
+err_srqc_alloc:
+	free_srqc(hr_dev, srq);
+err_wrid_alloc:
+	free_srq_wrid(srq);
+err_idx_alloc:
+	free_srq_idx(hr_dev, srq);
+err_buf_alloc:
+	free_srq_buf(hr_dev, srq);
+	return ret;
+}
+
+int hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibsrq->device);
+	struct hns_roce_srq *srq = to_hr_srq(ibsrq);
+
+	free_srqc(hr_dev, srq);
+	free_srq_idx(hr_dev, srq);
+	free_srq_wrid(srq);
+	free_srq_buf(hr_dev, srq);
+	return 0;
+}
+
+int hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
+{
+	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
+
+	xa_init(&srq_table->xa);
+
+	return hns_roce_bitmap_init(&srq_table->bitmap, hr_dev->caps.num_srqs,
+				    hr_dev->caps.num_srqs - 1,
+				    hr_dev->caps.reserved_srqs, 0);
+}
+
+void hns_roce_cleanup_srq_table(struct hns_roce_dev *hr_dev)
+{
+	hns_roce_bitmap_cleanup(&hr_dev->srq_table.bitmap);
+}