| /* |
| * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. |
| * Copyright (c) 2005 Cisco Systems. All rights reserved. |
| * Copyright (c) 2005 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. |
| * |
| * $Id$ |
| */ |
| |
| #include <linux/mm.h> |
| |
| #include "mthca_memfree.h" |
| #include "mthca_dev.h" |
| #include "mthca_cmd.h" |
| |
| /* |
| * We allocate in as big chunks as we can, up to a maximum of 256 KB |
| * per chunk. |
| */ |
| enum { |
| MTHCA_ICM_ALLOC_SIZE = 1 << 18, |
| MTHCA_TABLE_CHUNK_SIZE = 1 << 18 |
| }; |
| |
| struct mthca_user_db_table { |
| struct semaphore mutex; |
| struct { |
| u64 uvirt; |
| struct scatterlist mem; |
| int refcount; |
| } page[0]; |
| }; |
| |
| void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm) |
| { |
| struct mthca_icm_chunk *chunk, *tmp; |
| int i; |
| |
| if (!icm) |
| return; |
| |
| list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) { |
| 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(chunk->mem[i].page, |
| get_order(chunk->mem[i].length)); |
| |
| kfree(chunk); |
| } |
| |
| kfree(icm); |
| } |
| |
| struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages, |
| unsigned int gfp_mask) |
| { |
| struct mthca_icm *icm; |
| struct mthca_icm_chunk *chunk = NULL; |
| int cur_order; |
| |
| icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN)); |
| if (!icm) |
| return icm; |
| |
| icm->refcount = 0; |
| INIT_LIST_HEAD(&icm->chunk_list); |
| |
| cur_order = get_order(MTHCA_ICM_ALLOC_SIZE); |
| |
| while (npages > 0) { |
| if (!chunk) { |
| chunk = kmalloc(sizeof *chunk, |
| gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN)); |
| if (!chunk) |
| goto fail; |
| |
| chunk->npages = 0; |
| chunk->nsg = 0; |
| list_add_tail(&chunk->list, &icm->chunk_list); |
| } |
| |
| while (1 << cur_order > npages) |
| --cur_order; |
| |
| chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order); |
| if (chunk->mem[chunk->npages].page) { |
| chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order; |
| chunk->mem[chunk->npages].offset = 0; |
| |
| if (++chunk->npages == MTHCA_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 (chunk) { |
| chunk->nsg = pci_map_sg(dev->pdev, chunk->mem, |
| chunk->npages, |
| PCI_DMA_BIDIRECTIONAL); |
| |
| if (chunk->nsg <= 0) |
| goto fail; |
| } |
| |
| return icm; |
| |
| fail: |
| mthca_free_icm(dev, icm); |
| return NULL; |
| } |
| |
| int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj) |
| { |
| int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE; |
| int ret = 0; |
| u8 status; |
| |
| down(&table->mutex); |
| |
| if (table->icm[i]) { |
| ++table->icm[i]->refcount; |
| goto out; |
| } |
| |
| table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT, |
| (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) | |
| __GFP_NOWARN); |
| if (!table->icm[i]) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE, |
| &status) || status) { |
| mthca_free_icm(dev, table->icm[i]); |
| table->icm[i] = NULL; |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| ++table->icm[i]->refcount; |
| |
| out: |
| up(&table->mutex); |
| return ret; |
| } |
| |
| void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj) |
| { |
| int i; |
| u8 status; |
| |
| if (!mthca_is_memfree(dev)) |
| return; |
| |
| i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE; |
| |
| down(&table->mutex); |
| |
| if (--table->icm[i]->refcount == 0) { |
| mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE, |
| MTHCA_TABLE_CHUNK_SIZE >> 12, &status); |
| mthca_free_icm(dev, table->icm[i]); |
| table->icm[i] = NULL; |
| } |
| |
| up(&table->mutex); |
| } |
| |
| void *mthca_table_find(struct mthca_icm_table *table, int obj) |
| { |
| int idx, offset, i; |
| struct mthca_icm_chunk *chunk; |
| struct mthca_icm *icm; |
| struct page *page = NULL; |
| |
| if (!table->lowmem) |
| return NULL; |
| |
| down(&table->mutex); |
| |
| idx = (obj & (table->num_obj - 1)) * table->obj_size; |
| icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE]; |
| offset = idx % MTHCA_TABLE_CHUNK_SIZE; |
| |
| if (!icm) |
| goto out; |
| |
| list_for_each_entry(chunk, &icm->chunk_list, list) { |
| for (i = 0; i < chunk->npages; ++i) { |
| if (chunk->mem[i].length >= offset) { |
| page = chunk->mem[i].page; |
| break; |
| } |
| offset -= chunk->mem[i].length; |
| } |
| } |
| |
| out: |
| up(&table->mutex); |
| return page ? lowmem_page_address(page) + offset : NULL; |
| } |
| |
| int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table, |
| int start, int end) |
| { |
| int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size; |
| int i, err; |
| |
| for (i = start; i <= end; i += inc) { |
| err = mthca_table_get(dev, table, i); |
| if (err) |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| while (i > start) { |
| i -= inc; |
| mthca_table_put(dev, table, i); |
| } |
| |
| return err; |
| } |
| |
| void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table, |
| int start, int end) |
| { |
| int i; |
| |
| if (!mthca_is_memfree(dev)) |
| return; |
| |
| for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size) |
| mthca_table_put(dev, table, i); |
| } |
| |
| struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev, |
| u64 virt, int obj_size, |
| int nobj, int reserved, |
| int use_lowmem) |
| { |
| struct mthca_icm_table *table; |
| int num_icm; |
| int i; |
| u8 status; |
| |
| num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE; |
| |
| table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL); |
| if (!table) |
| return NULL; |
| |
| table->virt = virt; |
| table->num_icm = num_icm; |
| table->num_obj = nobj; |
| table->obj_size = obj_size; |
| table->lowmem = use_lowmem; |
| init_MUTEX(&table->mutex); |
| |
| for (i = 0; i < num_icm; ++i) |
| table->icm[i] = NULL; |
| |
| for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) { |
| table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT, |
| (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) | |
| __GFP_NOWARN); |
| if (!table->icm[i]) |
| goto err; |
| if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE, |
| &status) || status) { |
| mthca_free_icm(dev, table->icm[i]); |
| 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 table; |
| |
| err: |
| for (i = 0; i < num_icm; ++i) |
| if (table->icm[i]) { |
| mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE, |
| MTHCA_TABLE_CHUNK_SIZE >> 12, &status); |
| mthca_free_icm(dev, table->icm[i]); |
| } |
| |
| kfree(table); |
| |
| return NULL; |
| } |
| |
| void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table) |
| { |
| int i; |
| u8 status; |
| |
| for (i = 0; i < table->num_icm; ++i) |
| if (table->icm[i]) { |
| mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE, |
| MTHCA_TABLE_CHUNK_SIZE >> 12, &status); |
| mthca_free_icm(dev, table->icm[i]); |
| } |
| |
| kfree(table); |
| } |
| |
| static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page) |
| { |
| return dev->uar_table.uarc_base + |
| uar->index * dev->uar_table.uarc_size + |
| page * 4096; |
| } |
| |
| int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar, |
| struct mthca_user_db_table *db_tab, int index, u64 uaddr) |
| { |
| int ret = 0; |
| u8 status; |
| int i; |
| |
| if (!mthca_is_memfree(dev)) |
| return 0; |
| |
| if (index < 0 || index > dev->uar_table.uarc_size / 8) |
| return -EINVAL; |
| |
| down(&db_tab->mutex); |
| |
| i = index / MTHCA_DB_REC_PER_PAGE; |
| |
| if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE) || |
| (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) || |
| (uaddr & 4095)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (db_tab->page[i].refcount) { |
| ++db_tab->page[i].refcount; |
| goto out; |
| } |
| |
| ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0, |
| &db_tab->page[i].mem.page, NULL); |
| if (ret < 0) |
| goto out; |
| |
| db_tab->page[i].mem.length = 4096; |
| db_tab->page[i].mem.offset = uaddr & ~PAGE_MASK; |
| |
| ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); |
| if (ret < 0) { |
| put_page(db_tab->page[i].mem.page); |
| goto out; |
| } |
| |
| ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem), |
| mthca_uarc_virt(dev, uar, i), &status); |
| if (!ret && status) |
| ret = -EINVAL; |
| if (ret) { |
| pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); |
| put_page(db_tab->page[i].mem.page); |
| goto out; |
| } |
| |
| db_tab->page[i].uvirt = uaddr; |
| db_tab->page[i].refcount = 1; |
| |
| out: |
| up(&db_tab->mutex); |
| return ret; |
| } |
| |
| void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar, |
| struct mthca_user_db_table *db_tab, int index) |
| { |
| if (!mthca_is_memfree(dev)) |
| return; |
| |
| /* |
| * To make our bookkeeping simpler, we don't unmap DB |
| * pages until we clean up the whole db table. |
| */ |
| |
| down(&db_tab->mutex); |
| |
| --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount; |
| |
| up(&db_tab->mutex); |
| } |
| |
| struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev) |
| { |
| struct mthca_user_db_table *db_tab; |
| int npages; |
| int i; |
| |
| if (!mthca_is_memfree(dev)) |
| return NULL; |
| |
| npages = dev->uar_table.uarc_size / 4096; |
| db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL); |
| if (!db_tab) |
| return ERR_PTR(-ENOMEM); |
| |
| init_MUTEX(&db_tab->mutex); |
| for (i = 0; i < npages; ++i) { |
| db_tab->page[i].refcount = 0; |
| db_tab->page[i].uvirt = 0; |
| } |
| |
| return db_tab; |
| } |
| |
| void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar, |
| struct mthca_user_db_table *db_tab) |
| { |
| int i; |
| u8 status; |
| |
| if (!mthca_is_memfree(dev)) |
| return; |
| |
| for (i = 0; i < dev->uar_table.uarc_size / 4096; ++i) { |
| if (db_tab->page[i].uvirt) { |
| mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status); |
| pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); |
| put_page(db_tab->page[i].mem.page); |
| } |
| } |
| } |
| |
| int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db) |
| { |
| int group; |
| int start, end, dir; |
| int i, j; |
| struct mthca_db_page *page; |
| int ret = 0; |
| u8 status; |
| |
| down(&dev->db_tab->mutex); |
| |
| switch (type) { |
| case MTHCA_DB_TYPE_CQ_ARM: |
| case MTHCA_DB_TYPE_SQ: |
| group = 0; |
| start = 0; |
| end = dev->db_tab->max_group1; |
| dir = 1; |
| break; |
| |
| case MTHCA_DB_TYPE_CQ_SET_CI: |
| case MTHCA_DB_TYPE_RQ: |
| case MTHCA_DB_TYPE_SRQ: |
| group = 1; |
| start = dev->db_tab->npages - 1; |
| end = dev->db_tab->min_group2; |
| dir = -1; |
| break; |
| |
| default: |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| for (i = start; i != end; i += dir) |
| if (dev->db_tab->page[i].db_rec && |
| !bitmap_full(dev->db_tab->page[i].used, |
| MTHCA_DB_REC_PER_PAGE)) { |
| page = dev->db_tab->page + i; |
| goto found; |
| } |
| |
| if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| page = dev->db_tab->page + end; |
| page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096, |
| &page->mapping, GFP_KERNEL); |
| if (!page->db_rec) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| memset(page->db_rec, 0, 4096); |
| |
| ret = mthca_MAP_ICM_page(dev, page->mapping, |
| mthca_uarc_virt(dev, &dev->driver_uar, i), &status); |
| if (!ret && status) |
| ret = -EINVAL; |
| if (ret) { |
| dma_free_coherent(&dev->pdev->dev, 4096, |
| page->db_rec, page->mapping); |
| goto out; |
| } |
| |
| bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE); |
| if (group == 0) |
| ++dev->db_tab->max_group1; |
| else |
| --dev->db_tab->min_group2; |
| |
| found: |
| j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE); |
| set_bit(j, page->used); |
| |
| if (group == 1) |
| j = MTHCA_DB_REC_PER_PAGE - 1 - j; |
| |
| ret = i * MTHCA_DB_REC_PER_PAGE + j; |
| |
| page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5)); |
| |
| *db = (u32 *) &page->db_rec[j]; |
| |
| out: |
| up(&dev->db_tab->mutex); |
| |
| return ret; |
| } |
| |
| void mthca_free_db(struct mthca_dev *dev, int type, int db_index) |
| { |
| int i, j; |
| struct mthca_db_page *page; |
| u8 status; |
| |
| i = db_index / MTHCA_DB_REC_PER_PAGE; |
| j = db_index % MTHCA_DB_REC_PER_PAGE; |
| |
| page = dev->db_tab->page + i; |
| |
| down(&dev->db_tab->mutex); |
| |
| page->db_rec[j] = 0; |
| if (i >= dev->db_tab->min_group2) |
| j = MTHCA_DB_REC_PER_PAGE - 1 - j; |
| clear_bit(j, page->used); |
| |
| if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) && |
| i >= dev->db_tab->max_group1 - 1) { |
| mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status); |
| |
| dma_free_coherent(&dev->pdev->dev, 4096, |
| page->db_rec, page->mapping); |
| page->db_rec = NULL; |
| |
| if (i == dev->db_tab->max_group1) { |
| --dev->db_tab->max_group1; |
| /* XXX may be able to unmap more pages now */ |
| } |
| if (i == dev->db_tab->min_group2) |
| ++dev->db_tab->min_group2; |
| } |
| |
| up(&dev->db_tab->mutex); |
| } |
| |
| int mthca_init_db_tab(struct mthca_dev *dev) |
| { |
| int i; |
| |
| if (!mthca_is_memfree(dev)) |
| return 0; |
| |
| dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL); |
| if (!dev->db_tab) |
| return -ENOMEM; |
| |
| init_MUTEX(&dev->db_tab->mutex); |
| |
| dev->db_tab->npages = dev->uar_table.uarc_size / 4096; |
| dev->db_tab->max_group1 = 0; |
| dev->db_tab->min_group2 = dev->db_tab->npages - 1; |
| |
| dev->db_tab->page = kmalloc(dev->db_tab->npages * |
| sizeof *dev->db_tab->page, |
| GFP_KERNEL); |
| if (!dev->db_tab->page) { |
| kfree(dev->db_tab); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < dev->db_tab->npages; ++i) |
| dev->db_tab->page[i].db_rec = NULL; |
| |
| return 0; |
| } |
| |
| void mthca_cleanup_db_tab(struct mthca_dev *dev) |
| { |
| int i; |
| u8 status; |
| |
| if (!mthca_is_memfree(dev)) |
| return; |
| |
| /* |
| * Because we don't always free our UARC pages when they |
| * become empty to make mthca_free_db() simpler we need to |
| * make a sweep through the doorbell pages and free any |
| * leftover pages now. |
| */ |
| for (i = 0; i < dev->db_tab->npages; ++i) { |
| if (!dev->db_tab->page[i].db_rec) |
| continue; |
| |
| if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE)) |
| mthca_warn(dev, "Kernel UARC page %d not empty\n", i); |
| |
| mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status); |
| |
| dma_free_coherent(&dev->pdev->dev, 4096, |
| dev->db_tab->page[i].db_rec, |
| dev->db_tab->page[i].mapping); |
| } |
| |
| kfree(dev->db_tab->page); |
| kfree(dev->db_tab); |
| } |