1 files changed, 430 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c
new file mode 100644
index 000000000000..02393fdf44c1
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx4/icm.c
@@ -0,0 +1,430 @@
+/*
+ * 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/slab.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) {
+                        if (--cur_order < 0)
+                                goto fail;
+                        else
+                                continue;
+                }
+
+                ++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;
+                }
+
+                if (chunk->npages == MLX4_ICM_CHUNK_LEN)
+                        chunk = NULL;
+
+                npages -= 1 << cur_order;
+        }
+
+        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);
+}
+
+static 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_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);
+}