1 files changed, 313 insertions, 0 deletions

diff --git a/drivers/message/i2o/memory.c b/drivers/message/i2o/memory.c
new file mode 100644
index 000000000000..f5cc95c564e2
--- /dev/null
+++ b/drivers/message/i2o/memory.c
@@ -0,0 +1,313 @@
+/*
+ *      Functions to handle I2O memory
+ *
+ *      Pulled from the inlines in i2o headers and uninlined
+ *
+ *
+ *      This program is free software; you can redistribute it and/or modify it
+ *      under the terms of the GNU General Public License as published by the
+ *      Free Software Foundation; either version 2 of the License, or (at your
+ *      option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/i2o.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include "core.h"
+
+/* Protects our 32/64bit mask switching */
+static DEFINE_MUTEX(mem_lock);
+
+/**
+ *      i2o_sg_tablesize - Calculate the maximum number of elements in a SGL
+ *      @c: I2O controller for which the calculation should be done
+ *      @body_size: maximum body size used for message in 32-bit words.
+ *
+ *      Return the maximum number of SG elements in a SG list.
+ */
+u16 i2o_sg_tablesize(struct i2o_controller *c, u16 body_size)
+{
+        i2o_status_block *sb = c->status_block.virt;
+        u16 sg_count =
+            (sb->inbound_frame_size - sizeof(struct i2o_message) / 4) -
+            body_size;
+
+        if (c->pae_support) {
+                /*
+                 * for 64-bit a SG attribute element must be added and each
+                 * SG element needs 12 bytes instead of 8.
+                 */
+                sg_count -= 2;
+                sg_count /= 3;
+        } else
+                sg_count /= 2;
+
+        if (c->short_req && (sg_count > 8))
+                sg_count = 8;
+
+        return sg_count;
+}
+EXPORT_SYMBOL_GPL(i2o_sg_tablesize);
+
+
+/**
+ *      i2o_dma_map_single - Map pointer to controller and fill in I2O message.
+ *      @c: I2O controller
+ *      @ptr: pointer to the data which should be mapped
+ *      @size: size of data in bytes
+ *      @direction: DMA_TO_DEVICE / DMA_FROM_DEVICE
+ *      @sg_ptr: pointer to the SG list inside the I2O message
+ *
+ *      This function does all necessary DMA handling and also writes the I2O
+ *      SGL elements into the I2O message. For details on DMA handling see also
+ *      dma_map_single(). The pointer sg_ptr will only be set to the end of the
+ *      SG list if the allocation was successful.
+ *
+ *      Returns DMA address which must be checked for failures using
+ *      dma_mapping_error().
+ */
+dma_addr_t i2o_dma_map_single(struct i2o_controller *c, void *ptr,
+                                            size_t size,
+                                            enum dma_data_direction direction,
+                                            u32 ** sg_ptr)
+{
+        u32 sg_flags;
+        u32 *mptr = *sg_ptr;
+        dma_addr_t dma_addr;
+
+        switch (direction) {
+        case DMA_TO_DEVICE:
+                sg_flags = 0xd4000000;
+                break;
+        case DMA_FROM_DEVICE:
+                sg_flags = 0xd0000000;
+                break;
+        default:
+                return 0;
+        }
+
+        dma_addr = dma_map_single(&c->pdev->dev, ptr, size, direction);
+        if (!dma_mapping_error(&c->pdev->dev, dma_addr)) {
+#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
+                if ((sizeof(dma_addr_t) > 4) && c->pae_support) {
+                        *mptr++ = cpu_to_le32(0x7C020002);
+                        *mptr++ = cpu_to_le32(PAGE_SIZE);
+                }
+#endif
+
+                *mptr++ = cpu_to_le32(sg_flags | size);
+                *mptr++ = cpu_to_le32(i2o_dma_low(dma_addr));
+#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
+                if ((sizeof(dma_addr_t) > 4) && c->pae_support)
+                        *mptr++ = cpu_to_le32(i2o_dma_high(dma_addr));
+#endif
+                *sg_ptr = mptr;
+        }
+        return dma_addr;
+}
+EXPORT_SYMBOL_GPL(i2o_dma_map_single);
+
+/**
+ *      i2o_dma_map_sg - Map a SG List to controller and fill in I2O message.
+ *      @c: I2O controller
+ *      @sg: SG list to be mapped
+ *      @sg_count: number of elements in the SG list
+ *      @direction: DMA_TO_DEVICE / DMA_FROM_DEVICE
+ *      @sg_ptr: pointer to the SG list inside the I2O message
+ *
+ *      This function does all necessary DMA handling and also writes the I2O
+ *      SGL elements into the I2O message. For details on DMA handling see also
+ *      dma_map_sg(). The pointer sg_ptr will only be set to the end of the SG
+ *      list if the allocation was successful.
+ *
+ *      Returns 0 on failure or 1 on success.
+ */
+int i2o_dma_map_sg(struct i2o_controller *c, struct scatterlist *sg,
+            int sg_count, enum dma_data_direction direction, u32 ** sg_ptr)
+{
+        u32 sg_flags;
+        u32 *mptr = *sg_ptr;
+
+        switch (direction) {
+        case DMA_TO_DEVICE:
+                sg_flags = 0x14000000;
+                break;
+        case DMA_FROM_DEVICE:
+                sg_flags = 0x10000000;
+                break;
+        default:
+                return 0;
+        }
+
+        sg_count = dma_map_sg(&c->pdev->dev, sg, sg_count, direction);
+        if (!sg_count)
+                return 0;
+
+#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
+        if ((sizeof(dma_addr_t) > 4) && c->pae_support) {
+                *mptr++ = cpu_to_le32(0x7C020002);
+                *mptr++ = cpu_to_le32(PAGE_SIZE);
+        }
+#endif
+
+        while (sg_count-- > 0) {
+                if (!sg_count)
+                        sg_flags |= 0xC0000000;
+                *mptr++ = cpu_to_le32(sg_flags | sg_dma_len(sg));
+                *mptr++ = cpu_to_le32(i2o_dma_low(sg_dma_address(sg)));
+#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
+                if ((sizeof(dma_addr_t) > 4) && c->pae_support)
+                        *mptr++ = cpu_to_le32(i2o_dma_high(sg_dma_address(sg)));
+#endif
+                sg = sg_next(sg);
+        }
+        *sg_ptr = mptr;
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(i2o_dma_map_sg);
+
+/**
+ *      i2o_dma_alloc - Allocate DMA memory
+ *      @dev: struct device pointer to the PCI device of the I2O controller
+ *      @addr: i2o_dma struct which should get the DMA buffer
+ *      @len: length of the new DMA memory
+ *
+ *      Allocate a coherent DMA memory and write the pointers into addr.
+ *
+ *      Returns 0 on success or -ENOMEM on failure.
+ */
+int i2o_dma_alloc(struct device *dev, struct i2o_dma *addr, size_t len)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        int dma_64 = 0;
+
+        mutex_lock(&mem_lock);
+        if ((sizeof(dma_addr_t) > 4) && (pdev->dma_mask == DMA_64BIT_MASK)) {
+                dma_64 = 1;
+                if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
+                        mutex_unlock(&mem_lock);
+                        return -ENOMEM;
+                }
+        }
+
+        addr->virt = dma_alloc_coherent(dev, len, &addr->phys, GFP_KERNEL);
+
+        if ((sizeof(dma_addr_t) > 4) && dma_64)
+                if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
+                        printk(KERN_WARNING "i2o: unable to set 64-bit DMA");
+        mutex_unlock(&mem_lock);
+
+        if (!addr->virt)
+                return -ENOMEM;
+
+        memset(addr->virt, 0, len);
+        addr->len = len;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(i2o_dma_alloc);
+
+
+/**
+ *      i2o_dma_free - Free DMA memory
+ *      @dev: struct device pointer to the PCI device of the I2O controller
+ *      @addr: i2o_dma struct which contains the DMA buffer
+ *
+ *      Free a coherent DMA memory and set virtual address of addr to NULL.
+ */
+void i2o_dma_free(struct device *dev, struct i2o_dma *addr)
+{
+        if (addr->virt) {
+                if (addr->phys)
+                        dma_free_coherent(dev, addr->len, addr->virt,
+                                          addr->phys);
+                else
+                        kfree(addr->virt);
+                addr->virt = NULL;
+        }
+}
+EXPORT_SYMBOL_GPL(i2o_dma_free);
+
+
+/**
+ *      i2o_dma_realloc - Realloc DMA memory
+ *      @dev: struct device pointer to the PCI device of the I2O controller
+ *      @addr: pointer to a i2o_dma struct DMA buffer
+ *      @len: new length of memory
+ *
+ *      If there was something allocated in the addr, free it first. If len > 0
+ *      than try to allocate it and write the addresses back to the addr
+ *      structure. If len == 0 set the virtual address to NULL.
+ *
+ *      Returns the 0 on success or negative error code on failure.
+ */
+int i2o_dma_realloc(struct device *dev, struct i2o_dma *addr, size_t len)
+{
+        i2o_dma_free(dev, addr);
+
+        if (len)
+                return i2o_dma_alloc(dev, addr, len);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(i2o_dma_realloc);
+
+/*
+ *      i2o_pool_alloc - Allocate an slab cache and mempool
+ *      @mempool: pointer to struct i2o_pool to write data into.
+ *      @name: name which is used to identify cache
+ *      @size: size of each object
+ *      @min_nr: minimum number of objects
+ *
+ *      First allocates a slab cache with name and size. Then allocates a
+ *      mempool which uses the slab cache for allocation and freeing.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+int i2o_pool_alloc(struct i2o_pool *pool, const char *name,
+                                 size_t size, int min_nr)
+{
+        pool->name = kmalloc(strlen(name) + 1, GFP_KERNEL);
+        if (!pool->name)
+                goto exit;
+        strcpy(pool->name, name);
+
+        pool->slab =
+            kmem_cache_create(pool->name, size, 0, SLAB_HWCACHE_ALIGN, NULL);
+        if (!pool->slab)
+                goto free_name;
+
+        pool->mempool = mempool_create_slab_pool(min_nr, pool->slab);
+        if (!pool->mempool)
+                goto free_slab;
+
+        return 0;
+
+free_slab:
+        kmem_cache_destroy(pool->slab);
+
+free_name:
+        kfree(pool->name);
+
+exit:
+        return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(i2o_pool_alloc);
+
+/*
+ *      i2o_pool_free - Free slab cache and mempool again
+ *      @mempool: pointer to struct i2o_pool which should be freed
+ *
+ *      Note that you have to return all objects to the mempool again before
+ *      calling i2o_pool_free().
+ */
+void i2o_pool_free(struct i2o_pool *pool)
+{
+        mempool_destroy(pool->mempool);
+        kmem_cache_destroy(pool->slab);
+        kfree(pool->name);
+};
+EXPORT_SYMBOL_GPL(i2o_pool_free);