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Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_mr.c')
-rw-r--r--drivers/infiniband/sw/rxe/rxe_mr.c731
1 files changed, 731 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
new file mode 100644
index 000000000..f54042e9a
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -0,0 +1,731 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ */
+
+#include <linux/libnvdimm.h>
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+/* Return a random 8 bit key value that is
+ * different than the last_key. Set last_key to -1
+ * if this is the first key for an MR or MW
+ */
+u8 rxe_get_next_key(u32 last_key)
+{
+ u8 key;
+
+ do {
+ get_random_bytes(&key, 1);
+ } while (key == last_key);
+
+ return key;
+}
+
+int mr_check_range(struct rxe_mr *mr, u64 iova, size_t length)
+{
+ switch (mr->ibmr.type) {
+ case IB_MR_TYPE_DMA:
+ return 0;
+
+ case IB_MR_TYPE_USER:
+ case IB_MR_TYPE_MEM_REG:
+ if (iova < mr->ibmr.iova ||
+ iova + length > mr->ibmr.iova + mr->ibmr.length) {
+ rxe_dbg_mr(mr, "iova/length out of range");
+ return -EINVAL;
+ }
+ return 0;
+
+ default:
+ rxe_dbg_mr(mr, "mr type not supported\n");
+ return -EINVAL;
+ }
+}
+
+static void rxe_mr_init(int access, struct rxe_mr *mr)
+{
+ u32 key = mr->elem.index << 8 | rxe_get_next_key(-1);
+
+ /* set ibmr->l/rkey and also copy into private l/rkey
+ * for user MRs these will always be the same
+ * for cases where caller 'owns' the key portion
+ * they may be different until REG_MR WQE is executed.
+ */
+ mr->lkey = mr->ibmr.lkey = key;
+ mr->rkey = mr->ibmr.rkey = key;
+
+ mr->access = access;
+ mr->ibmr.page_size = PAGE_SIZE;
+ mr->page_mask = PAGE_MASK;
+ mr->page_shift = PAGE_SHIFT;
+ mr->state = RXE_MR_STATE_INVALID;
+}
+
+void rxe_mr_init_dma(int access, struct rxe_mr *mr)
+{
+ rxe_mr_init(access, mr);
+
+ mr->state = RXE_MR_STATE_VALID;
+ mr->ibmr.type = IB_MR_TYPE_DMA;
+}
+
+static unsigned long rxe_mr_iova_to_index(struct rxe_mr *mr, u64 iova)
+{
+ return (iova >> mr->page_shift) - (mr->ibmr.iova >> mr->page_shift);
+}
+
+static unsigned long rxe_mr_iova_to_page_offset(struct rxe_mr *mr, u64 iova)
+{
+ return iova & (mr_page_size(mr) - 1);
+}
+
+static bool is_pmem_page(struct page *pg)
+{
+ unsigned long paddr = page_to_phys(pg);
+
+ return REGION_INTERSECTS ==
+ region_intersects(paddr, PAGE_SIZE, IORESOURCE_MEM,
+ IORES_DESC_PERSISTENT_MEMORY);
+}
+
+static int rxe_mr_fill_pages_from_sgt(struct rxe_mr *mr, struct sg_table *sgt)
+{
+ XA_STATE(xas, &mr->page_list, 0);
+ struct sg_page_iter sg_iter;
+ struct page *page;
+ bool persistent = !!(mr->access & IB_ACCESS_FLUSH_PERSISTENT);
+
+ __sg_page_iter_start(&sg_iter, sgt->sgl, sgt->orig_nents, 0);
+ if (!__sg_page_iter_next(&sg_iter))
+ return 0;
+
+ do {
+ xas_lock(&xas);
+ while (true) {
+ page = sg_page_iter_page(&sg_iter);
+
+ if (persistent && !is_pmem_page(page)) {
+ rxe_dbg_mr(mr, "Page can't be persistent\n");
+ xas_set_err(&xas, -EINVAL);
+ break;
+ }
+
+ xas_store(&xas, page);
+ if (xas_error(&xas))
+ break;
+ xas_next(&xas);
+ if (!__sg_page_iter_next(&sg_iter))
+ break;
+ }
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ return xas_error(&xas);
+}
+
+int rxe_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length, u64 iova,
+ int access, struct rxe_mr *mr)
+{
+ struct ib_umem *umem;
+ int err;
+
+ rxe_mr_init(access, mr);
+
+ xa_init(&mr->page_list);
+
+ umem = ib_umem_get(&rxe->ib_dev, start, length, access);
+ if (IS_ERR(umem)) {
+ rxe_dbg_mr(mr, "Unable to pin memory region err = %d\n",
+ (int)PTR_ERR(umem));
+ return PTR_ERR(umem);
+ }
+
+ err = rxe_mr_fill_pages_from_sgt(mr, &umem->sgt_append.sgt);
+ if (err) {
+ ib_umem_release(umem);
+ return err;
+ }
+
+ mr->umem = umem;
+ mr->ibmr.type = IB_MR_TYPE_USER;
+ mr->state = RXE_MR_STATE_VALID;
+
+ return 0;
+}
+
+static int rxe_mr_alloc(struct rxe_mr *mr, int num_buf)
+{
+ XA_STATE(xas, &mr->page_list, 0);
+ int i = 0;
+ int err;
+
+ xa_init(&mr->page_list);
+
+ do {
+ xas_lock(&xas);
+ while (i != num_buf) {
+ xas_store(&xas, XA_ZERO_ENTRY);
+ if (xas_error(&xas))
+ break;
+ xas_next(&xas);
+ i++;
+ }
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ err = xas_error(&xas);
+ if (err)
+ return err;
+
+ mr->num_buf = num_buf;
+
+ return 0;
+}
+
+int rxe_mr_init_fast(int max_pages, struct rxe_mr *mr)
+{
+ int err;
+
+ /* always allow remote access for FMRs */
+ rxe_mr_init(RXE_ACCESS_REMOTE, mr);
+
+ err = rxe_mr_alloc(mr, max_pages);
+ if (err)
+ goto err1;
+
+ mr->state = RXE_MR_STATE_FREE;
+ mr->ibmr.type = IB_MR_TYPE_MEM_REG;
+
+ return 0;
+
+err1:
+ return err;
+}
+
+static int rxe_set_page(struct ib_mr *ibmr, u64 dma_addr)
+{
+ struct rxe_mr *mr = to_rmr(ibmr);
+ struct page *page = ib_virt_dma_to_page(dma_addr);
+ bool persistent = !!(mr->access & IB_ACCESS_FLUSH_PERSISTENT);
+ int err;
+
+ if (persistent && !is_pmem_page(page)) {
+ rxe_dbg_mr(mr, "Page cannot be persistent\n");
+ return -EINVAL;
+ }
+
+ if (unlikely(mr->nbuf == mr->num_buf))
+ return -ENOMEM;
+
+ err = xa_err(xa_store(&mr->page_list, mr->nbuf, page, GFP_KERNEL));
+ if (err)
+ return err;
+
+ mr->nbuf++;
+ return 0;
+}
+
+int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sgl,
+ int sg_nents, unsigned int *sg_offset)
+{
+ struct rxe_mr *mr = to_rmr(ibmr);
+ unsigned int page_size = mr_page_size(mr);
+
+ mr->nbuf = 0;
+ mr->page_shift = ilog2(page_size);
+ mr->page_mask = ~((u64)page_size - 1);
+ mr->page_offset = mr->ibmr.iova & (page_size - 1);
+
+ return ib_sg_to_pages(ibmr, sgl, sg_nents, sg_offset, rxe_set_page);
+}
+
+static int rxe_mr_copy_xarray(struct rxe_mr *mr, u64 iova, void *addr,
+ unsigned int length, enum rxe_mr_copy_dir dir)
+{
+ unsigned int page_offset = rxe_mr_iova_to_page_offset(mr, iova);
+ unsigned long index = rxe_mr_iova_to_index(mr, iova);
+ unsigned int bytes;
+ struct page *page;
+ void *va;
+
+ while (length) {
+ page = xa_load(&mr->page_list, index);
+ if (!page)
+ return -EFAULT;
+
+ bytes = min_t(unsigned int, length,
+ mr_page_size(mr) - page_offset);
+ va = kmap_local_page(page);
+ if (dir == RXE_FROM_MR_OBJ)
+ memcpy(addr, va + page_offset, bytes);
+ else
+ memcpy(va + page_offset, addr, bytes);
+ kunmap_local(va);
+
+ page_offset = 0;
+ addr += bytes;
+ length -= bytes;
+ index++;
+ }
+
+ return 0;
+}
+
+static void rxe_mr_copy_dma(struct rxe_mr *mr, u64 dma_addr, void *addr,
+ unsigned int length, enum rxe_mr_copy_dir dir)
+{
+ unsigned int page_offset = dma_addr & (PAGE_SIZE - 1);
+ unsigned int bytes;
+ struct page *page;
+ u8 *va;
+
+ while (length) {
+ page = ib_virt_dma_to_page(dma_addr);
+ bytes = min_t(unsigned int, length,
+ PAGE_SIZE - page_offset);
+ va = kmap_local_page(page);
+
+ if (dir == RXE_TO_MR_OBJ)
+ memcpy(va + page_offset, addr, bytes);
+ else
+ memcpy(addr, va + page_offset, bytes);
+
+ kunmap_local(va);
+ page_offset = 0;
+ dma_addr += bytes;
+ addr += bytes;
+ length -= bytes;
+ }
+}
+
+int rxe_mr_copy(struct rxe_mr *mr, u64 iova, void *addr,
+ unsigned int length, enum rxe_mr_copy_dir dir)
+{
+ int err;
+
+ if (length == 0)
+ return 0;
+
+ if (WARN_ON(!mr))
+ return -EINVAL;
+
+ if (mr->ibmr.type == IB_MR_TYPE_DMA) {
+ rxe_mr_copy_dma(mr, iova, addr, length, dir);
+ return 0;
+ }
+
+ err = mr_check_range(mr, iova, length);
+ if (unlikely(err)) {
+ rxe_dbg_mr(mr, "iova out of range");
+ return err;
+ }
+
+ return rxe_mr_copy_xarray(mr, iova, addr, length, dir);
+}
+
+/* copy data in or out of a wqe, i.e. sg list
+ * under the control of a dma descriptor
+ */
+int copy_data(
+ struct rxe_pd *pd,
+ int access,
+ struct rxe_dma_info *dma,
+ void *addr,
+ int length,
+ enum rxe_mr_copy_dir dir)
+{
+ int bytes;
+ struct rxe_sge *sge = &dma->sge[dma->cur_sge];
+ int offset = dma->sge_offset;
+ int resid = dma->resid;
+ struct rxe_mr *mr = NULL;
+ u64 iova;
+ int err;
+
+ if (length == 0)
+ return 0;
+
+ if (length > resid) {
+ err = -EINVAL;
+ goto err2;
+ }
+
+ if (sge->length && (offset < sge->length)) {
+ mr = lookup_mr(pd, access, sge->lkey, RXE_LOOKUP_LOCAL);
+ if (!mr) {
+ err = -EINVAL;
+ goto err1;
+ }
+ }
+
+ while (length > 0) {
+ bytes = length;
+
+ if (offset >= sge->length) {
+ if (mr) {
+ rxe_put(mr);
+ mr = NULL;
+ }
+ sge++;
+ dma->cur_sge++;
+ offset = 0;
+
+ if (dma->cur_sge >= dma->num_sge) {
+ err = -ENOSPC;
+ goto err2;
+ }
+
+ if (sge->length) {
+ mr = lookup_mr(pd, access, sge->lkey,
+ RXE_LOOKUP_LOCAL);
+ if (!mr) {
+ err = -EINVAL;
+ goto err1;
+ }
+ } else {
+ continue;
+ }
+ }
+
+ if (bytes > sge->length - offset)
+ bytes = sge->length - offset;
+
+ if (bytes > 0) {
+ iova = sge->addr + offset;
+ err = rxe_mr_copy(mr, iova, addr, bytes, dir);
+ if (err)
+ goto err2;
+
+ offset += bytes;
+ resid -= bytes;
+ length -= bytes;
+ addr += bytes;
+ }
+ }
+
+ dma->sge_offset = offset;
+ dma->resid = resid;
+
+ if (mr)
+ rxe_put(mr);
+
+ return 0;
+
+err2:
+ if (mr)
+ rxe_put(mr);
+err1:
+ return err;
+}
+
+int rxe_flush_pmem_iova(struct rxe_mr *mr, u64 iova, unsigned int length)
+{
+ unsigned int page_offset;
+ unsigned long index;
+ struct page *page;
+ unsigned int bytes;
+ int err;
+ u8 *va;
+
+ /* mr must be valid even if length is zero */
+ if (WARN_ON(!mr))
+ return -EINVAL;
+
+ if (length == 0)
+ return 0;
+
+ if (mr->ibmr.type == IB_MR_TYPE_DMA)
+ return -EFAULT;
+
+ err = mr_check_range(mr, iova, length);
+ if (err)
+ return err;
+
+ while (length > 0) {
+ index = rxe_mr_iova_to_index(mr, iova);
+ page = xa_load(&mr->page_list, index);
+ page_offset = rxe_mr_iova_to_page_offset(mr, iova);
+ if (!page)
+ return -EFAULT;
+ bytes = min_t(unsigned int, length,
+ mr_page_size(mr) - page_offset);
+
+ va = kmap_local_page(page);
+ arch_wb_cache_pmem(va + page_offset, bytes);
+ kunmap_local(va);
+
+ length -= bytes;
+ iova += bytes;
+ page_offset = 0;
+ }
+
+ return 0;
+}
+
+/* Guarantee atomicity of atomic operations at the machine level. */
+static DEFINE_SPINLOCK(atomic_ops_lock);
+
+int rxe_mr_do_atomic_op(struct rxe_mr *mr, u64 iova, int opcode,
+ u64 compare, u64 swap_add, u64 *orig_val)
+{
+ unsigned int page_offset;
+ struct page *page;
+ u64 value;
+ u64 *va;
+
+ if (unlikely(mr->state != RXE_MR_STATE_VALID)) {
+ rxe_dbg_mr(mr, "mr not in valid state");
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+
+ if (mr->ibmr.type == IB_MR_TYPE_DMA) {
+ page_offset = iova & (PAGE_SIZE - 1);
+ page = ib_virt_dma_to_page(iova);
+ } else {
+ unsigned long index;
+ int err;
+
+ err = mr_check_range(mr, iova, sizeof(value));
+ if (err) {
+ rxe_dbg_mr(mr, "iova out of range");
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+ page_offset = rxe_mr_iova_to_page_offset(mr, iova);
+ index = rxe_mr_iova_to_index(mr, iova);
+ page = xa_load(&mr->page_list, index);
+ if (!page)
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+
+ if (unlikely(page_offset & 0x7)) {
+ rxe_dbg_mr(mr, "iova not aligned");
+ return RESPST_ERR_MISALIGNED_ATOMIC;
+ }
+
+ va = kmap_local_page(page);
+
+ spin_lock_bh(&atomic_ops_lock);
+ value = *orig_val = va[page_offset >> 3];
+
+ if (opcode == IB_OPCODE_RC_COMPARE_SWAP) {
+ if (value == compare)
+ va[page_offset >> 3] = swap_add;
+ } else {
+ value += swap_add;
+ va[page_offset >> 3] = value;
+ }
+ spin_unlock_bh(&atomic_ops_lock);
+
+ kunmap_local(va);
+
+ return 0;
+}
+
+#if defined CONFIG_64BIT
+/* only implemented or called for 64 bit architectures */
+int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
+{
+ unsigned int page_offset;
+ struct page *page;
+ u64 *va;
+
+ /* See IBA oA19-28 */
+ if (unlikely(mr->state != RXE_MR_STATE_VALID)) {
+ rxe_dbg_mr(mr, "mr not in valid state");
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+
+ if (mr->ibmr.type == IB_MR_TYPE_DMA) {
+ page_offset = iova & (PAGE_SIZE - 1);
+ page = ib_virt_dma_to_page(iova);
+ } else {
+ unsigned long index;
+ int err;
+
+ /* See IBA oA19-28 */
+ err = mr_check_range(mr, iova, sizeof(value));
+ if (unlikely(err)) {
+ rxe_dbg_mr(mr, "iova out of range");
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+ page_offset = rxe_mr_iova_to_page_offset(mr, iova);
+ index = rxe_mr_iova_to_index(mr, iova);
+ page = xa_load(&mr->page_list, index);
+ if (!page)
+ return RESPST_ERR_RKEY_VIOLATION;
+ }
+
+ /* See IBA A19.4.2 */
+ if (unlikely(page_offset & 0x7)) {
+ rxe_dbg_mr(mr, "misaligned address");
+ return RESPST_ERR_MISALIGNED_ATOMIC;
+ }
+
+ va = kmap_local_page(page);
+
+ /* Do atomic write after all prior operations have completed */
+ smp_store_release(&va[page_offset >> 3], value);
+
+ kunmap_local(va);
+
+ return 0;
+}
+#else
+int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
+{
+ return RESPST_ERR_UNSUPPORTED_OPCODE;
+}
+#endif
+
+int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
+{
+ struct rxe_sge *sge = &dma->sge[dma->cur_sge];
+ int offset = dma->sge_offset;
+ int resid = dma->resid;
+
+ while (length) {
+ unsigned int bytes;
+
+ if (offset >= sge->length) {
+ sge++;
+ dma->cur_sge++;
+ offset = 0;
+ if (dma->cur_sge >= dma->num_sge)
+ return -ENOSPC;
+ }
+
+ bytes = length;
+
+ if (bytes > sge->length - offset)
+ bytes = sge->length - offset;
+
+ offset += bytes;
+ resid -= bytes;
+ length -= bytes;
+ }
+
+ dma->sge_offset = offset;
+ dma->resid = resid;
+
+ return 0;
+}
+
+struct rxe_mr *lookup_mr(struct rxe_pd *pd, int access, u32 key,
+ enum rxe_mr_lookup_type type)
+{
+ struct rxe_mr *mr;
+ struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
+ int index = key >> 8;
+
+ mr = rxe_pool_get_index(&rxe->mr_pool, index);
+ if (!mr)
+ return NULL;
+
+ if (unlikely((type == RXE_LOOKUP_LOCAL && mr->lkey != key) ||
+ (type == RXE_LOOKUP_REMOTE && mr->rkey != key) ||
+ mr_pd(mr) != pd || ((access & mr->access) != access) ||
+ mr->state != RXE_MR_STATE_VALID)) {
+ rxe_put(mr);
+ mr = NULL;
+ }
+
+ return mr;
+}
+
+int rxe_invalidate_mr(struct rxe_qp *qp, u32 key)
+{
+ struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+ struct rxe_mr *mr;
+ int remote;
+ int ret;
+
+ mr = rxe_pool_get_index(&rxe->mr_pool, key >> 8);
+ if (!mr) {
+ rxe_dbg_qp(qp, "No MR for key %#x\n", key);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ remote = mr->access & RXE_ACCESS_REMOTE;
+ if (remote ? (key != mr->rkey) : (key != mr->lkey)) {
+ rxe_dbg_mr(mr, "wr key (%#x) doesn't match mr key (%#x)\n",
+ key, (remote ? mr->rkey : mr->lkey));
+ ret = -EINVAL;
+ goto err_drop_ref;
+ }
+
+ if (atomic_read(&mr->num_mw) > 0) {
+ rxe_dbg_mr(mr, "Attempt to invalidate an MR while bound to MWs\n");
+ ret = -EINVAL;
+ goto err_drop_ref;
+ }
+
+ if (unlikely(mr->ibmr.type != IB_MR_TYPE_MEM_REG)) {
+ rxe_dbg_mr(mr, "Type (%d) is wrong\n", mr->ibmr.type);
+ ret = -EINVAL;
+ goto err_drop_ref;
+ }
+
+ mr->state = RXE_MR_STATE_FREE;
+ ret = 0;
+
+err_drop_ref:
+ rxe_put(mr);
+err:
+ return ret;
+}
+
+/* user can (re)register fast MR by executing a REG_MR WQE.
+ * user is expected to hold a reference on the ib mr until the
+ * WQE completes.
+ * Once a fast MR is created this is the only way to change the
+ * private keys. It is the responsibility of the user to maintain
+ * the ib mr keys in sync with rxe mr keys.
+ */
+int rxe_reg_fast_mr(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
+{
+ struct rxe_mr *mr = to_rmr(wqe->wr.wr.reg.mr);
+ u32 key = wqe->wr.wr.reg.key;
+ u32 access = wqe->wr.wr.reg.access;
+
+ /* user can only register MR in free state */
+ if (unlikely(mr->state != RXE_MR_STATE_FREE)) {
+ rxe_dbg_mr(mr, "mr->lkey = 0x%x not free\n", mr->lkey);
+ return -EINVAL;
+ }
+
+ /* user can only register mr with qp in same protection domain */
+ if (unlikely(qp->ibqp.pd != mr->ibmr.pd)) {
+ rxe_dbg_mr(mr, "qp->pd and mr->pd don't match\n");
+ return -EINVAL;
+ }
+
+ /* user is only allowed to change key portion of l/rkey */
+ if (unlikely((mr->lkey & ~0xff) != (key & ~0xff))) {
+ rxe_dbg_mr(mr, "key = 0x%x has wrong index mr->lkey = 0x%x\n",
+ key, mr->lkey);
+ return -EINVAL;
+ }
+
+ mr->access = access;
+ mr->lkey = key;
+ mr->rkey = key;
+ mr->ibmr.iova = wqe->wr.wr.reg.mr->iova;
+ mr->state = RXE_MR_STATE_VALID;
+
+ return 0;
+}
+
+void rxe_mr_cleanup(struct rxe_pool_elem *elem)
+{
+ struct rxe_mr *mr = container_of(elem, typeof(*mr), elem);
+
+ rxe_put(mr_pd(mr));
+ ib_umem_release(mr->umem);
+
+ if (mr->ibmr.type != IB_MR_TYPE_DMA)
+ xa_destroy(&mr->page_list);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-19 13:25:42 +0000