- 根目录:
- drivers
- staging
- i2o
- memory.c
/*
* 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 "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_BIT_MASK(64))) {
dma_64 = 1;
if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
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_BIT_MASK(64)))
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 = kstrdup(name, GFP_KERNEL);
if (!pool->name)
goto exit;
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);