/* * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved. * Copyright (c) 2006, 2007 Cisco Systems, Inc. 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/errno.h> #include <linux/mm.h> #include <linux/scatterlist.h> #include <linux/mlx4/cmd.h> #include "mlx4.h" #include "icm.h" #include "fw.h" /* * We allocate in as big chunks as we can, up to a maximum of 256 KB * per chunk. */ enum { MLX4_ICM_ALLOC_SIZE = 1 << 18, MLX4_TABLE_CHUNK_SIZE = 1 << 18 }; static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk) { int i; if (chunk->nsg > 0) pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages, PCI_DMA_BIDIRECTIONAL); for (i = 0; i < chunk->npages; ++i) __free_pages(sg_page(&chunk->mem[i]), get_order(chunk->mem[i].length)); } static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk) { int i; for (i = 0; i < chunk->npages; ++i) dma_free_coherent(&dev->pdev->dev, chunk->mem[i].length, lowmem_page_address(sg_page(&chunk->mem[i])), sg_dma_address(&chunk->mem[i])); } void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent) { struct mlx4_icm_chunk *chunk, *tmp; if (!icm) return; list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) { if (coherent) mlx4_free_icm_coherent(dev, chunk); else mlx4_free_icm_pages(dev, chunk); kfree(chunk); } kfree(icm); } static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order, gfp_t gfp_mask) { struct page *page; page = alloc_pages(gfp_mask, order); if (!page) return -ENOMEM; sg_set_page(mem, page, PAGE_SIZE << order, 0); return 0; } static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem, int order, gfp_t gfp_mask) { void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order, &sg_dma_address(mem), gfp_mask); if (!buf) return -ENOMEM; sg_set_buf(mem, buf, PAGE_SIZE << order); BUG_ON(mem->offset); sg_dma_len(mem) = PAGE_SIZE << order; return 0; } struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages, gfp_t gfp_mask, int coherent) { struct mlx4_icm *icm; struct mlx4_icm_chunk *chunk = NULL; int cur_order; int ret; /* We use sg_set_buf for coherent allocs, which assumes low memory */ BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM)); icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN)); if (!icm) return NULL; icm->refcount = 0; INIT_LIST_HEAD(&icm->chunk_list); cur_order = get_order(MLX4_ICM_ALLOC_SIZE); while (npages > 0) { if (!chunk) { chunk = kmalloc(sizeof *chunk, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN)); if (!chunk) goto fail; sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN); chunk->npages = 0; chunk->nsg = 0; list_add_tail(&chunk->list, &icm->chunk_list); } while (1 << cur_order > npages) --cur_order; if (coherent) ret = mlx4_alloc_icm_coherent(&dev->pdev->dev, &chunk->mem[chunk->npages], cur_order, gfp_mask); else ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages], cur_order, gfp_mask); if (!ret) { ++chunk->npages; if (coherent) ++chunk->nsg; else if (chunk->npages == MLX4_ICM_CHUNK_LEN) { chunk->nsg = pci_map_sg(dev->pdev, chunk->mem, chunk->npages, PCI_DMA_BIDIRECTIONAL); if (chunk->nsg <= 0) goto fail; chunk = NULL; } npages -= 1 << cur_order; } else { --cur_order; if (cur_order < 0) goto fail; } } if (!coherent && chunk) { chunk->nsg = pci_map_sg(dev->pdev, chunk->mem, chunk->npages, PCI_DMA_BIDIRECTIONAL); if (chunk->nsg <= 0) goto fail; } return icm; fail: mlx4_free_icm(dev, icm, coherent); return NULL; } static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt) { return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt); } int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count) { return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM, MLX4_CMD_TIME_CLASS_B); } int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt) { struct mlx4_cmd_mailbox *mailbox; __be64 *inbox; int err; mailbox = mlx4_alloc_cmd_mailbox(dev); if (IS_ERR(mailbox)) return PTR_ERR(mailbox); inbox = mailbox->buf; inbox[0] = cpu_to_be64(virt); inbox[1] = cpu_to_be64(dma_addr); err = mlx4_cmd(dev, mailbox->dma, 1, 0, MLX4_CMD_MAP_ICM, MLX4_CMD_TIME_CLASS_B); mlx4_free_cmd_mailbox(dev, mailbox); if (!err) mlx4_dbg(dev, "Mapped page at %llx to %llx for ICM.\n", (unsigned long long) dma_addr, (unsigned long long) virt); return err; } int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm) { return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1); } int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev) { return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX, MLX4_CMD_TIME_CLASS_B); } int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj) { int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size); int ret = 0; mutex_lock(&table->mutex); if (table->icm[i]) { ++table->icm[i]->refcount; goto out; } table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT, (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) | __GFP_NOWARN, table->coherent); if (!table->icm[i]) { ret = -ENOMEM; goto out; } if (mlx4_MAP_ICM(dev, table->icm[i], table->virt + (u64) i * MLX4_TABLE_CHUNK_SIZE)) { mlx4_free_icm(dev, table->icm[i], table->coherent); table->icm[i] = NULL; ret = -ENOMEM; goto out; } ++table->icm[i]->refcount; out: mutex_unlock(&table->mutex); return ret; } void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj) { int i; i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size); mutex_lock(&table->mutex); if (--table->icm[i]->refcount == 0) { mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE, MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE); mlx4_free_icm(dev, table->icm[i], table->coherent); table->icm[i] = NULL; } mutex_unlock(&table->mutex); } void *mlx4_table_find(struct mlx4_icm_table *table, int obj, dma_addr_t *dma_handle) { int idx, offset, dma_offset, i; struct mlx4_icm_chunk *chunk; struct mlx4_icm *icm; struct page *page = NULL; if (!table->lowmem) return NULL; mutex_lock(&table->mutex); idx = (obj & (table->num_obj - 1)) * table->obj_size; icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE]; dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE; if (!icm) goto out; list_for_each_entry(chunk, &icm->chunk_list, list) { for (i = 0; i < chunk->npages; ++i) { if (dma_handle && dma_offset >= 0) { if (sg_dma_len(&chunk->mem[i]) > dma_offset) *dma_handle = sg_dma_address(&chunk->mem[i]) + dma_offset; dma_offset -= sg_dma_len(&chunk->mem[i]); } /* * DMA mapping can merge pages but not split them, * so if we found the page, dma_handle has already * been assigned to. */ if (chunk->mem[i].length > offset) { page = sg_page(&chunk->mem[i]); goto out; } offset -= chunk->mem[i].length; } } out: mutex_unlock(&table->mutex); return page ? lowmem_page_address(page) + offset : NULL; } int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, int start, int end) { int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size; int i, err; for (i = start; i <= end; i += inc) { err = mlx4_table_get(dev, table, i); if (err) goto fail; } return 0; fail: while (i > start) { i -= inc; mlx4_table_put(dev, table, i); } return err; } void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, int start, int end) { int i; for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size) mlx4_table_put(dev, table, i); } int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, u64 virt, int obj_size, int nobj, int reserved, int use_lowmem, int use_coherent) { int obj_per_chunk; int num_icm; unsigned chunk_size; int i; obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size; num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk; table->icm = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL); if (!table->icm) return -ENOMEM; table->virt = virt; table->num_icm = num_icm; table->num_obj = nobj; table->obj_size = obj_size; table->lowmem = use_lowmem; table->coherent = use_coherent; mutex_init(&table->mutex); for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) { chunk_size = MLX4_TABLE_CHUNK_SIZE; if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size) chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE); table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT, (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) | __GFP_NOWARN, use_coherent); if (!table->icm[i]) goto err; if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) { mlx4_free_icm(dev, table->icm[i], use_coherent); table->icm[i] = NULL; goto err; } /* * Add a reference to this ICM chunk so that it never * gets freed (since it contains reserved firmware objects). */ ++table->icm[i]->refcount; } return 0; err: for (i = 0; i < num_icm; ++i) if (table->icm[i]) { mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE, MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE); mlx4_free_icm(dev, table->icm[i], use_coherent); } return -ENOMEM; } void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table) { int i; for (i = 0; i < table->num_icm; ++i) if (table->icm[i]) { mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE, MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE); mlx4_free_icm(dev, table->icm[i], table->coherent); } kfree(table->icm); }