/*
* 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
MTHCA_TABLE_CHUNK_SIZE = 1 << 18
};
+struct mthca_user_db_table {
+ struct mutex 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;
}
struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
- unsigned int gfp_mask)
+ gfp_t gfp_mask)
{
struct mthca_icm *icm;
struct mthca_icm_chunk *chunk = NULL;
int ret = 0;
u8 status;
- down(&table->mutex);
+ mutex_lock(&table->mutex);
if (table->icm[i]) {
++table->icm[i]->refcount;
++table->icm[i]->refcount;
out:
- up(&table->mutex);
+ mutex_unlock(&table->mutex);
return ret;
}
void mthca_table_put(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 i;
u8 status;
- down(&table->mutex);
+ if (!mthca_is_memfree(dev))
+ return;
+
+ i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
+
+ mutex_lock(&table->mutex);
if (--table->icm[i]->refcount == 0) {
mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
table->icm[i] = NULL;
}
- up(&table->mutex);
+ mutex_unlock(&table->mutex);
}
void *mthca_table_find(struct mthca_icm_table *table, int obj)
if (!table->lowmem)
return NULL;
- down(&table->mutex);
+ mutex_lock(&table->mutex);
idx = (obj & (table->num_obj - 1)) * table->obj_size;
icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
for (i = 0; i < chunk->npages; ++i) {
if (chunk->mem[i].length >= offset) {
page = chunk->mem[i].page;
- break;
+ goto out;
}
offset -= chunk->mem[i].length;
}
}
out:
- up(&table->mutex);
+ mutex_unlock(&table->mutex);
return page ? lowmem_page_address(page) + offset : NULL;
}
{
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 *table;
int num_icm;
+ unsigned chunk_size;
int i;
u8 status;
- num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE;
+ num_icm = (obj_size * nobj + MTHCA_TABLE_CHUNK_SIZE - 1) / MTHCA_TABLE_CHUNK_SIZE;
table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
if (!table)
table->num_obj = nobj;
table->obj_size = obj_size;
table->lowmem = use_lowmem;
- init_MUTEX(&table->mutex);
+ mutex_init(&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,
+ chunk_size = MTHCA_TABLE_CHUNK_SIZE;
+ if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size)
+ chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE;
+
+ table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
(use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
__GFP_NOWARN);
if (!table->icm[i])
kfree(table);
}
-static u64 mthca_uarc_virt(struct mthca_dev *dev, int page)
+static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page)
{
return dev->uar_table.uarc_base +
- dev->driver_uar.index * dev->uar_table.uarc_size +
+ uar->index * dev->uar_table.uarc_size +
page * 4096;
}
-int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db)
+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;
+
+ mutex_lock(&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:
+ mutex_unlock(&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.
+ */
+
+ mutex_lock(&db_tab->mutex);
+
+ --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount;
+
+ mutex_unlock(&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);
+
+ mutex_init(&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);
+ }
+ }
+
+ kfree(db_tab);
+}
+
+int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
+ u32 qn, __be32 **db)
{
int group;
int start, end, dir;
int ret = 0;
u8 status;
- down(&dev->db_tab->mutex);
+ mutex_lock(&dev->db_tab->mutex);
switch (type) {
case MTHCA_DB_TYPE_CQ_ARM:
goto found;
}
+ for (i = start; i != end; i += dir)
+ if (!dev->db_tab->page[i].db_rec) {
+ page = dev->db_tab->page + i;
+ goto alloc;
+ }
+
if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
ret = -ENOMEM;
goto out;
}
+ if (group == 0)
+ ++dev->db_tab->max_group1;
+ else
+ --dev->db_tab->min_group2;
+
page = dev->db_tab->page + end;
+
+alloc:
page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096,
&page->mapping, GFP_KERNEL);
if (!page->db_rec) {
}
memset(page->db_rec, 0, 4096);
- ret = mthca_MAP_ICM_page(dev, page->mapping, mthca_uarc_virt(dev, i), &status);
+ ret = mthca_MAP_ICM_page(dev, page->mapping,
+ mthca_uarc_virt(dev, &dev->driver_uar, i), &status);
if (!ret && status)
ret = -EINVAL;
if (ret) {
}
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);
page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));
- *db = (u32 *) &page->db_rec[j];
+ *db = (__be32 *) &page->db_rec[j];
out:
- up(&dev->db_tab->mutex);
+ mutex_unlock(&dev->db_tab->mutex);
return ret;
}
page = dev->db_tab->page + i;
- down(&dev->db_tab->mutex);
+ mutex_lock(&dev->db_tab->mutex);
page->db_rec[j] = 0;
if (i >= dev->db_tab->min_group2)
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, i), 1, &status);
+ 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);
++dev->db_tab->min_group2;
}
- up(&dev->db_tab->mutex);
+ mutex_unlock(&dev->db_tab->mutex);
}
int mthca_init_db_tab(struct mthca_dev *dev)
if (!dev->db_tab)
return -ENOMEM;
- init_MUTEX(&dev->db_tab->mutex);
+ mutex_init(&dev->db_tab->mutex);
dev->db_tab->npages = dev->uar_table.uarc_size / 4096;
dev->db_tab->max_group1 = 0;
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, i), 1, &status);
+ 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,
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