diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/hw/mlx4/mr.c | 717 |
1 files changed, 717 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c new file mode 100644 index 000000000..811b4bb34 --- /dev/null +++ b/drivers/infiniband/hw/mlx4/mr.c @@ -0,0 +1,717 @@ +/* + * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/slab.h> +#include <rdma/ib_user_verbs.h> + +#include "mlx4_ib.h" + +static u32 convert_access(int acc) +{ + return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC : 0) | + (acc & IB_ACCESS_REMOTE_WRITE ? MLX4_PERM_REMOTE_WRITE : 0) | + (acc & IB_ACCESS_REMOTE_READ ? MLX4_PERM_REMOTE_READ : 0) | + (acc & IB_ACCESS_LOCAL_WRITE ? MLX4_PERM_LOCAL_WRITE : 0) | + (acc & IB_ACCESS_MW_BIND ? MLX4_PERM_BIND_MW : 0) | + MLX4_PERM_LOCAL_READ; +} + +static enum mlx4_mw_type to_mlx4_type(enum ib_mw_type type) +{ + switch (type) { + case IB_MW_TYPE_1: return MLX4_MW_TYPE_1; + case IB_MW_TYPE_2: return MLX4_MW_TYPE_2; + default: return -1; + } +} + +struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc) +{ + struct mlx4_ib_mr *mr; + int err; + + mr = kzalloc(sizeof(*mr), GFP_KERNEL); + if (!mr) + return ERR_PTR(-ENOMEM); + + err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0, + ~0ull, convert_access(acc), 0, 0, &mr->mmr); + if (err) + goto err_free; + + err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr); + if (err) + goto err_mr; + + mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; + mr->umem = NULL; + + return &mr->ibmr; + +err_mr: + (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr); + +err_free: + kfree(mr); + + return ERR_PTR(err); +} + +enum { + MLX4_MAX_MTT_SHIFT = 31 +}; + +static int mlx4_ib_umem_write_mtt_block(struct mlx4_ib_dev *dev, + struct mlx4_mtt *mtt, + u64 mtt_size, u64 mtt_shift, u64 len, + u64 cur_start_addr, u64 *pages, + int *start_index, int *npages) +{ + u64 cur_end_addr = cur_start_addr + len; + u64 cur_end_addr_aligned = 0; + u64 mtt_entries; + int err = 0; + int k; + + len += (cur_start_addr & (mtt_size - 1ULL)); + cur_end_addr_aligned = round_up(cur_end_addr, mtt_size); + len += (cur_end_addr_aligned - cur_end_addr); + if (len & (mtt_size - 1ULL)) { + pr_warn("write_block: len %llx is not aligned to mtt_size %llx\n", + len, mtt_size); + return -EINVAL; + } + + mtt_entries = (len >> mtt_shift); + + /* + * Align the MTT start address to the mtt_size. + * Required to handle cases when the MR starts in the middle of an MTT + * record. Was not required in old code since the physical addresses + * provided by the dma subsystem were page aligned, which was also the + * MTT size. + */ + cur_start_addr = round_down(cur_start_addr, mtt_size); + /* A new block is started ... */ + for (k = 0; k < mtt_entries; ++k) { + pages[*npages] = cur_start_addr + (mtt_size * k); + (*npages)++; + /* + * Be friendly to mlx4_write_mtt() and pass it chunks of + * appropriate size. + */ + if (*npages == PAGE_SIZE / sizeof(u64)) { + err = mlx4_write_mtt(dev->dev, mtt, *start_index, + *npages, pages); + if (err) + return err; + + (*start_index) += *npages; + *npages = 0; + } + } + + return 0; +} + +static inline u64 alignment_of(u64 ptr) +{ + return ilog2(ptr & (~(ptr - 1))); +} + +static int mlx4_ib_umem_calc_block_mtt(u64 next_block_start, + u64 current_block_end, + u64 block_shift) +{ + /* Check whether the alignment of the new block is aligned as well as + * the previous block. + * Block address must start with zeros till size of entity_size. + */ + if ((next_block_start & ((1ULL << block_shift) - 1ULL)) != 0) + /* + * It is not as well aligned as the previous block-reduce the + * mtt size accordingly. Here we take the last right bit which + * is 1. + */ + block_shift = alignment_of(next_block_start); + + /* + * Check whether the alignment of the end of previous block - is it + * aligned as well as the start of the block + */ + if (((current_block_end) & ((1ULL << block_shift) - 1ULL)) != 0) + /* + * It is not as well aligned as the start of the block - + * reduce the mtt size accordingly. + */ + block_shift = alignment_of(current_block_end); + + return block_shift; +} + +int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt, + struct ib_umem *umem) +{ + u64 *pages; + u64 len = 0; + int err = 0; + u64 mtt_size; + u64 cur_start_addr = 0; + u64 mtt_shift; + int start_index = 0; + int npages = 0; + struct scatterlist *sg; + int i; + + pages = (u64 *) __get_free_page(GFP_KERNEL); + if (!pages) + return -ENOMEM; + + mtt_shift = mtt->page_shift; + mtt_size = 1ULL << mtt_shift; + + for_each_sg(umem->sg_head.sgl, sg, umem->nmap, i) { + if (cur_start_addr + len == sg_dma_address(sg)) { + /* still the same block */ + len += sg_dma_len(sg); + continue; + } + /* + * A new block is started ... + * If len is malaligned, write an extra mtt entry to cover the + * misaligned area (round up the division) + */ + err = mlx4_ib_umem_write_mtt_block(dev, mtt, mtt_size, + mtt_shift, len, + cur_start_addr, + pages, &start_index, + &npages); + if (err) + goto out; + + cur_start_addr = sg_dma_address(sg); + len = sg_dma_len(sg); + } + + /* Handle the last block */ + if (len > 0) { + /* + * If len is malaligned, write an extra mtt entry to cover + * the misaligned area (round up the division) + */ + err = mlx4_ib_umem_write_mtt_block(dev, mtt, mtt_size, + mtt_shift, len, + cur_start_addr, pages, + &start_index, &npages); + if (err) + goto out; + } + + if (npages) + err = mlx4_write_mtt(dev->dev, mtt, start_index, npages, pages); + +out: + free_page((unsigned long) pages); + return err; +} + +/* + * Calculate optimal mtt size based on contiguous pages. + * Function will return also the number of pages that are not aligned to the + * calculated mtt_size to be added to total number of pages. For that we should + * check the first chunk length & last chunk length and if not aligned to + * mtt_size we should increment the non_aligned_pages number. All chunks in the + * middle already handled as part of mtt shift calculation for both their start + * & end addresses. + */ +int mlx4_ib_umem_calc_optimal_mtt_size(struct ib_umem *umem, u64 start_va, + int *num_of_mtts) +{ + u64 block_shift = MLX4_MAX_MTT_SHIFT; + u64 min_shift = PAGE_SHIFT; + u64 last_block_aligned_end = 0; + u64 current_block_start = 0; + u64 first_block_start = 0; + u64 current_block_len = 0; + u64 last_block_end = 0; + struct scatterlist *sg; + u64 current_block_end; + u64 misalignment_bits; + u64 next_block_start; + u64 total_len = 0; + int i; + + *num_of_mtts = ib_umem_num_dma_blocks(umem, PAGE_SIZE); + + for_each_sg(umem->sg_head.sgl, sg, umem->nmap, i) { + /* + * Initialization - save the first chunk start as the + * current_block_start - block means contiguous pages. + */ + if (current_block_len == 0 && current_block_start == 0) { + current_block_start = sg_dma_address(sg); + first_block_start = current_block_start; + /* + * Find the bits that are different between the physical + * address and the virtual address for the start of the + * MR. + * umem_get aligned the start_va to a page boundary. + * Therefore, we need to align the start va to the same + * boundary. + * misalignment_bits is needed to handle the case of a + * single memory region. In this case, the rest of the + * logic will not reduce the block size. If we use a + * block size which is bigger than the alignment of the + * misalignment bits, we might use the virtual page + * number instead of the physical page number, resulting + * in access to the wrong data. + */ + misalignment_bits = + (start_va & (~(((u64)(PAGE_SIZE)) - 1ULL))) ^ + current_block_start; + block_shift = min(alignment_of(misalignment_bits), + block_shift); + } + + /* + * Go over the scatter entries and check if they continue the + * previous scatter entry. + */ + next_block_start = sg_dma_address(sg); + current_block_end = current_block_start + current_block_len; + /* If we have a split (non-contig.) between two blocks */ + if (current_block_end != next_block_start) { + block_shift = mlx4_ib_umem_calc_block_mtt + (next_block_start, + current_block_end, + block_shift); + + /* + * If we reached the minimum shift for 4k page we stop + * the loop. + */ + if (block_shift <= min_shift) + goto end; + + /* + * If not saved yet we are in first block - we save the + * length of first block to calculate the + * non_aligned_pages number at the end. + */ + total_len += current_block_len; + + /* Start a new block */ + current_block_start = next_block_start; + current_block_len = sg_dma_len(sg); + continue; + } + /* The scatter entry is another part of the current block, + * increase the block size. + * An entry in the scatter can be larger than 4k (page) as of + * dma mapping which merge some blocks together. + */ + current_block_len += sg_dma_len(sg); + } + + /* Account for the last block in the total len */ + total_len += current_block_len; + /* Add to the first block the misalignment that it suffers from. */ + total_len += (first_block_start & ((1ULL << block_shift) - 1ULL)); + last_block_end = current_block_start + current_block_len; + last_block_aligned_end = round_up(last_block_end, 1ULL << block_shift); + total_len += (last_block_aligned_end - last_block_end); + + if (total_len & ((1ULL << block_shift) - 1ULL)) + pr_warn("misaligned total length detected (%llu, %llu)!", + total_len, block_shift); + + *num_of_mtts = total_len >> block_shift; +end: + if (block_shift < min_shift) { + /* + * If shift is less than the min we set a warning and return the + * min shift. + */ + pr_warn("umem_calc_optimal_mtt_size - unexpected shift %lld\n", block_shift); + + block_shift = min_shift; + } + return block_shift; +} + +static struct ib_umem *mlx4_get_umem_mr(struct ib_device *device, u64 start, + u64 length, int access_flags) +{ + /* + * Force registering the memory as writable if the underlying pages + * are writable. This is so rereg can change the access permissions + * from readable to writable without having to run through ib_umem_get + * again + */ + if (!ib_access_writable(access_flags)) { + unsigned long untagged_start = untagged_addr(start); + struct vm_area_struct *vma; + + mmap_read_lock(current->mm); + /* + * FIXME: Ideally this would iterate over all the vmas that + * cover the memory, but for now it requires a single vma to + * entirely cover the MR to support RO mappings. + */ + vma = find_vma(current->mm, untagged_start); + if (vma && vma->vm_end >= untagged_start + length && + vma->vm_start <= untagged_start) { + if (vma->vm_flags & VM_WRITE) + access_flags |= IB_ACCESS_LOCAL_WRITE; + } else { + access_flags |= IB_ACCESS_LOCAL_WRITE; + } + + mmap_read_unlock(current->mm); + } + + return ib_umem_get(device, start, length, access_flags); +} + +struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, + u64 virt_addr, int access_flags, + struct ib_udata *udata) +{ + struct mlx4_ib_dev *dev = to_mdev(pd->device); + struct mlx4_ib_mr *mr; + int shift; + int err; + int n; + + mr = kzalloc(sizeof(*mr), GFP_KERNEL); + if (!mr) + return ERR_PTR(-ENOMEM); + + mr->umem = mlx4_get_umem_mr(pd->device, start, length, access_flags); + if (IS_ERR(mr->umem)) { + err = PTR_ERR(mr->umem); + goto err_free; + } + + shift = mlx4_ib_umem_calc_optimal_mtt_size(mr->umem, start, &n); + + err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length, + convert_access(access_flags), n, shift, &mr->mmr); + if (err) + goto err_umem; + + err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem); + if (err) + goto err_mr; + + err = mlx4_mr_enable(dev->dev, &mr->mmr); + if (err) + goto err_mr; + + mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; + mr->ibmr.page_size = 1U << shift; + + return &mr->ibmr; + +err_mr: + (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr); + +err_umem: + ib_umem_release(mr->umem); + +err_free: + kfree(mr); + + return ERR_PTR(err); +} + +int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags, + u64 start, u64 length, u64 virt_addr, + int mr_access_flags, struct ib_pd *pd, + struct ib_udata *udata) +{ + struct mlx4_ib_dev *dev = to_mdev(mr->device); + struct mlx4_ib_mr *mmr = to_mmr(mr); + struct mlx4_mpt_entry *mpt_entry; + struct mlx4_mpt_entry **pmpt_entry = &mpt_entry; + int err; + + /* Since we synchronize this call and mlx4_ib_dereg_mr via uverbs, + * we assume that the calls can't run concurrently. Otherwise, a + * race exists. + */ + err = mlx4_mr_hw_get_mpt(dev->dev, &mmr->mmr, &pmpt_entry); + + if (err) + return err; + + if (flags & IB_MR_REREG_PD) { + err = mlx4_mr_hw_change_pd(dev->dev, *pmpt_entry, + to_mpd(pd)->pdn); + + if (err) + goto release_mpt_entry; + } + + if (flags & IB_MR_REREG_ACCESS) { + if (ib_access_writable(mr_access_flags) && + !mmr->umem->writable) { + err = -EPERM; + goto release_mpt_entry; + } + + err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry, + convert_access(mr_access_flags)); + + if (err) + goto release_mpt_entry; + } + + if (flags & IB_MR_REREG_TRANS) { + int shift; + int n; + + mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr); + ib_umem_release(mmr->umem); + mmr->umem = mlx4_get_umem_mr(mr->device, start, length, + mr_access_flags); + if (IS_ERR(mmr->umem)) { + err = PTR_ERR(mmr->umem); + /* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */ + mmr->umem = NULL; + goto release_mpt_entry; + } + n = ib_umem_num_dma_blocks(mmr->umem, PAGE_SIZE); + shift = PAGE_SHIFT; + + err = mlx4_mr_rereg_mem_write(dev->dev, &mmr->mmr, + virt_addr, length, n, shift, + *pmpt_entry); + if (err) { + ib_umem_release(mmr->umem); + goto release_mpt_entry; + } + mmr->mmr.iova = virt_addr; + mmr->mmr.size = length; + + err = mlx4_ib_umem_write_mtt(dev, &mmr->mmr.mtt, mmr->umem); + if (err) { + mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr); + ib_umem_release(mmr->umem); + goto release_mpt_entry; + } + } + + /* If we couldn't transfer the MR to the HCA, just remember to + * return a failure. But dereg_mr will free the resources. + */ + err = mlx4_mr_hw_write_mpt(dev->dev, &mmr->mmr, pmpt_entry); + if (!err && flags & IB_MR_REREG_ACCESS) + mmr->mmr.access = mr_access_flags; + +release_mpt_entry: + mlx4_mr_hw_put_mpt(dev->dev, pmpt_entry); + + return err; +} + +static int +mlx4_alloc_priv_pages(struct ib_device *device, + struct mlx4_ib_mr *mr, + int max_pages) +{ + int ret; + + /* Ensure that size is aligned to DMA cacheline + * requirements. + * max_pages is limited to MLX4_MAX_FAST_REG_PAGES + * so page_map_size will never cross PAGE_SIZE. + */ + mr->page_map_size = roundup(max_pages * sizeof(u64), + MLX4_MR_PAGES_ALIGN); + + /* Prevent cross page boundary allocation. */ + mr->pages = (__be64 *)get_zeroed_page(GFP_KERNEL); + if (!mr->pages) + return -ENOMEM; + + mr->page_map = dma_map_single(device->dev.parent, mr->pages, + mr->page_map_size, DMA_TO_DEVICE); + + if (dma_mapping_error(device->dev.parent, mr->page_map)) { + ret = -ENOMEM; + goto err; + } + + return 0; + +err: + free_page((unsigned long)mr->pages); + return ret; +} + +static void +mlx4_free_priv_pages(struct mlx4_ib_mr *mr) +{ + if (mr->pages) { + struct ib_device *device = mr->ibmr.device; + + dma_unmap_single(device->dev.parent, mr->page_map, + mr->page_map_size, DMA_TO_DEVICE); + free_page((unsigned long)mr->pages); + mr->pages = NULL; + } +} + +int mlx4_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) +{ + struct mlx4_ib_mr *mr = to_mmr(ibmr); + int ret; + + mlx4_free_priv_pages(mr); + + ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr); + if (ret) + return ret; + if (mr->umem) + ib_umem_release(mr->umem); + kfree(mr); + + return 0; +} + +int mlx4_ib_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata) +{ + struct mlx4_ib_dev *dev = to_mdev(ibmw->device); + struct mlx4_ib_mw *mw = to_mmw(ibmw); + int err; + + err = mlx4_mw_alloc(dev->dev, to_mpd(ibmw->pd)->pdn, + to_mlx4_type(ibmw->type), &mw->mmw); + if (err) + return err; + + err = mlx4_mw_enable(dev->dev, &mw->mmw); + if (err) + goto err_mw; + + ibmw->rkey = mw->mmw.key; + return 0; + +err_mw: + mlx4_mw_free(dev->dev, &mw->mmw); + return err; +} + +int mlx4_ib_dealloc_mw(struct ib_mw *ibmw) +{ + struct mlx4_ib_mw *mw = to_mmw(ibmw); + + mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw); + return 0; +} + +struct ib_mr *mlx4_ib_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type, + u32 max_num_sg) +{ + struct mlx4_ib_dev *dev = to_mdev(pd->device); + struct mlx4_ib_mr *mr; + int err; + + if (mr_type != IB_MR_TYPE_MEM_REG || + max_num_sg > MLX4_MAX_FAST_REG_PAGES) + return ERR_PTR(-EINVAL); + + mr = kzalloc(sizeof(*mr), GFP_KERNEL); + if (!mr) + return ERR_PTR(-ENOMEM); + + err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0, + max_num_sg, 0, &mr->mmr); + if (err) + goto err_free; + + err = mlx4_alloc_priv_pages(pd->device, mr, max_num_sg); + if (err) + goto err_free_mr; + + mr->max_pages = max_num_sg; + err = mlx4_mr_enable(dev->dev, &mr->mmr); + if (err) + goto err_free_pl; + + mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; + mr->umem = NULL; + + return &mr->ibmr; + +err_free_pl: + mr->ibmr.device = pd->device; + mlx4_free_priv_pages(mr); +err_free_mr: + (void) mlx4_mr_free(dev->dev, &mr->mmr); +err_free: + kfree(mr); + return ERR_PTR(err); +} + +static int mlx4_set_page(struct ib_mr *ibmr, u64 addr) +{ + struct mlx4_ib_mr *mr = to_mmr(ibmr); + + if (unlikely(mr->npages == mr->max_pages)) + return -ENOMEM; + + mr->pages[mr->npages++] = cpu_to_be64(addr | MLX4_MTT_FLAG_PRESENT); + + return 0; +} + +int mlx4_ib_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents, + unsigned int *sg_offset) +{ + struct mlx4_ib_mr *mr = to_mmr(ibmr); + int rc; + + mr->npages = 0; + + ib_dma_sync_single_for_cpu(ibmr->device, mr->page_map, + mr->page_map_size, DMA_TO_DEVICE); + + rc = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, mlx4_set_page); + + ib_dma_sync_single_for_device(ibmr->device, mr->page_map, + mr->page_map_size, DMA_TO_DEVICE); + + return rc; +} |