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iop-adma.c
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/*
* offload engine driver for the Intel Xscale series of i/o processors
* Copyright © 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/*
* This driver supports the asynchrounous DMA copy and RAID engines available
* on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/async_tx.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/memory.h>
#include <linux/ioport.h>
#include <mach/adma.h>
#define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
#define to_iop_adma_device(dev) \
container_of(dev, struct iop_adma_device, common)
#define tx_to_iop_adma_slot(tx) \
container_of(tx, struct iop_adma_desc_slot, async_tx)
/**
* iop_adma_free_slots - flags descriptor slots for reuse
* @slot: Slot to free
* Caller must hold &iop_chan->lock while calling this function
*/
static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
{
int stride = slot->slots_per_op;
while (stride--) {
slot->slots_per_op = 0;
slot = list_entry(slot->slot_node.next,
struct iop_adma_desc_slot,
slot_node);
}
}
static dma_cookie_t
iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
{
BUG_ON(desc->async_tx.cookie < 0);
if (desc->async_tx.cookie > 0) {
cookie = desc->async_tx.cookie;
desc->async_tx.cookie = 0;
/* call the callback (must not sleep or submit new
* operations to this channel)
*/
if (desc->async_tx.callback)
desc->async_tx.callback(
desc->async_tx.callback_param);
/* unmap dma addresses
* (unmap_single vs unmap_page?)
*/
if (desc->group_head && desc->unmap_len) {
struct iop_adma_desc_slot *unmap = desc->group_head;
struct device *dev =
&iop_chan->device->pdev->dev;
u32 len = unmap->unmap_len;
enum dma_ctrl_flags flags = desc->async_tx.flags;
u32 src_cnt;
dma_addr_t addr;
if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
addr = iop_desc_get_dest_addr(unmap, iop_chan);
dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
}
if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
src_cnt = unmap->unmap_src_cnt;
while (src_cnt--) {
addr = iop_desc_get_src_addr(unmap,
iop_chan,
src_cnt);
dma_unmap_page(dev, addr, len,
DMA_TO_DEVICE);
}
}
desc->group_head = NULL;
}
}
/* run dependent operations */
async_tx_run_dependencies(&desc->async_tx);
return cookie;
}
static int
iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan)
{
/* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->async_tx))
return 0;
/* leave the last descriptor in the chain
* so we can append to it
*/
if (desc->chain_node.next == &iop_chan->chain)
return 1;
dev_dbg(iop_chan->device->common.dev,
"\tfree slot: %d slots_per_op: %d\n",
desc->idx, desc->slots_per_op);
list_del(&desc->chain_node);
iop_adma_free_slots(desc);
return 0;
}
static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
{
struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
dma_cookie_t cookie = 0;
u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
int busy = iop_chan_is_busy(iop_chan);
int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
/* free completed slots from the chain starting with
* the oldest descriptor
*/
list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
chain_node) {
pr_debug("\tcookie: %d slot: %d busy: %d "
"this_desc: %#x next_desc: %#x ack: %d\n",
iter->async_tx.cookie, iter->idx, busy,
iter->async_tx.phys, iop_desc_get_next_desc(iter),
async_tx_test_ack(&iter->async_tx));
prefetch(_iter);
prefetch(&_iter->async_tx);
/* do not advance past the current descriptor loaded into the
* hardware channel, subsequent descriptors are either in
* process or have not been submitted
*/
if (seen_current)
break;
/* stop the search if we reach the current descriptor and the
* channel is busy, or if it appears that the current descriptor
* needs to be re-read (i.e. has been appended to)
*/
if (iter->async_tx.phys == current_desc) {
BUG_ON(seen_current++);
if (busy || iop_desc_get_next_desc(iter))
break;
}
/* detect the start of a group transaction */
if (!slot_cnt && !slots_per_op) {
slot_cnt = iter->slot_cnt;
slots_per_op = iter->slots_per_op;
if (slot_cnt <= slots_per_op) {
slot_cnt = 0;
slots_per_op = 0;
}
}
if (slot_cnt) {
pr_debug("\tgroup++\n");
if (!grp_start)
grp_start = iter;
slot_cnt -= slots_per_op;
}
/* all the members of a group are complete */
if (slots_per_op != 0 && slot_cnt == 0) {
struct iop_adma_desc_slot *grp_iter, *_grp_iter;
int end_of_chain = 0;
pr_debug("\tgroup end\n");
/* collect the total results */
if (grp_start->xor_check_result) {
u32 zero_sum_result = 0;
slot_cnt = grp_start->slot_cnt;
grp_iter = grp_start;
list_for_each_entry_from(grp_iter,
&iop_chan->chain, chain_node) {
zero_sum_result |=
iop_desc_get_zero_result(grp_iter);
pr_debug("\titer%d result: %d\n",
grp_iter->idx, zero_sum_result);
slot_cnt -= slots_per_op;
if (slot_cnt == 0)
break;
}
pr_debug("\tgrp_start->xor_check_result: %p\n",
grp_start->xor_check_result);
*grp_start->xor_check_result = zero_sum_result;
}
/* clean up the group */
slot_cnt = grp_start->slot_cnt;
grp_iter = grp_start;
list_for_each_entry_safe_from(grp_iter, _grp_iter,
&iop_chan->chain, chain_node) {
cookie = iop_adma_run_tx_complete_actions(
grp_iter, iop_chan, cookie);
slot_cnt -= slots_per_op;
end_of_chain = iop_adma_clean_slot(grp_iter,
iop_chan);
if (slot_cnt == 0 || end_of_chain)
break;
}
/* the group should be complete at this point */
BUG_ON(slot_cnt);
slots_per_op = 0;
grp_start = NULL;
if (end_of_chain)
break;
else
continue;
} else if (slots_per_op) /* wait for group completion */
continue;
/* write back zero sum results (single descriptor case) */
if (iter->xor_check_result && iter->async_tx.cookie)
*iter->xor_check_result =
iop_desc_get_zero_result(iter);
cookie = iop_adma_run_tx_complete_actions(
iter, iop_chan, cookie);
if (iop_adma_clean_slot(iter, iop_chan))
break;
}
BUG_ON(!seen_current);
if (cookie > 0) {
iop_chan->completed_cookie = cookie;
pr_debug("\tcompleted cookie %d\n", cookie);
}
}
static void
iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
{
spin_lock_bh(&iop_chan->lock);
__iop_adma_slot_cleanup(iop_chan);
spin_unlock_bh(&iop_chan->lock);
}
static void iop_adma_tasklet(unsigned long data)
{
struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
spin_lock(&iop_chan->lock);
__iop_adma_slot_cleanup(iop_chan);
spin_unlock(&iop_chan->lock);
}
static struct iop_adma_desc_slot *
iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
int slots_per_op)
{
struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
LIST_HEAD(chain);
int slots_found, retry = 0;
/* start search from the last allocated descrtiptor
* if a contiguous allocation can not be found start searching
* from the beginning of the list
*/
retry:
slots_found = 0;
if (retry == 0)
iter = iop_chan->last_used;
else
iter = list_entry(&iop_chan->all_slots,
struct iop_adma_desc_slot,
slot_node);
list_for_each_entry_safe_continue(
iter, _iter, &iop_chan->all_slots, slot_node) {
prefetch(_iter);
prefetch(&_iter->async_tx);
if (iter->slots_per_op) {
/* give up after finding the first busy slot
* on the second pass through the list
*/
if (retry)
break;
slots_found = 0;
continue;
}
/* start the allocation if the slot is correctly aligned */
if (!slots_found++) {
if (iop_desc_is_aligned(iter, slots_per_op))
alloc_start = iter;
else {
slots_found = 0;
continue;
}
}
if (slots_found == num_slots) {
struct iop_adma_desc_slot *alloc_tail = NULL;
struct iop_adma_desc_slot *last_used = NULL;
iter = alloc_start;
while (num_slots) {
int i;
dev_dbg(iop_chan->device->common.dev,
"allocated slot: %d "
"(desc %p phys: %#x) slots_per_op %d\n",
iter->idx, iter->hw_desc,
iter->async_tx.phys, slots_per_op);
/* pre-ack all but the last descriptor */
if (num_slots != slots_per_op)
async_tx_ack(&iter->async_tx);
list_add_tail(&iter->chain_node, &chain);
alloc_tail = iter;
iter->async_tx.cookie = 0;
iter->slot_cnt = num_slots;
iter->xor_check_result = NULL;
for (i = 0; i < slots_per_op; i++) {
iter->slots_per_op = slots_per_op - i;
last_used = iter;
iter = list_entry(iter->slot_node.next,
struct iop_adma_desc_slot,
slot_node);
}
num_slots -= slots_per_op;
}
alloc_tail->group_head = alloc_start;
alloc_tail->async_tx.cookie = -EBUSY;
list_splice(&chain, &alloc_tail->async_tx.tx_list);
iop_chan->last_used = last_used;
iop_desc_clear_next_desc(alloc_start);
iop_desc_clear_next_desc(alloc_tail);
return alloc_tail;
}
}
if (!retry++)
goto retry;
/* perform direct reclaim if the allocation fails */
__iop_adma_slot_cleanup(iop_chan);
return NULL;
}
static dma_cookie_t
iop_desc_assign_cookie(struct iop_adma_chan *iop_chan,
struct iop_adma_desc_slot *desc)
{
dma_cookie_t cookie = iop_chan->common.cookie;
cookie++;
if (cookie < 0)
cookie = 1;
iop_chan->common.cookie = desc->async_tx.cookie = cookie;
return cookie;
}
static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
{
dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
iop_chan->pending);
if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
iop_chan->pending = 0;
iop_chan_append(iop_chan);
}
}
static dma_cookie_t
iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
struct iop_adma_desc_slot *grp_start, *old_chain_tail;
int slot_cnt;
int slots_per_op;
dma_cookie_t cookie;
grp_start = sw_desc->group_head;
slot_cnt = grp_start->slot_cnt;
slots_per_op = grp_start->slots_per_op;
spin_lock_bh(&iop_chan->lock);
cookie = iop_desc_assign_cookie(iop_chan, sw_desc);
old_chain_tail = list_entry(iop_chan->chain.prev,
struct iop_adma_desc_slot, chain_node);
list_splice_init(&sw_desc->async_tx.tx_list,
&old_chain_tail->chain_node);
/* fix up the hardware chain */
iop_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
/* 1/ don't add pre-chained descriptors
* 2/ dummy read to flush next_desc write
*/
BUG_ON(iop_desc_get_next_desc(sw_desc));
/* increment the pending count by the number of slots
* memcpy operations have a 1:1 (slot:operation) relation
* other operations are heavier and will pop the threshold
* more often.
*/
iop_chan->pending += slot_cnt;
iop_adma_check_threshold(iop_chan);
spin_unlock_bh(&iop_chan->lock);
dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
__func__, sw_desc->async_tx.cookie, sw_desc->idx);
return cookie;
}
static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
/**
* iop_adma_alloc_chan_resources - returns the number of allocated descriptors
* @chan - allocate descriptor resources for this channel
* @client - current client requesting the channel be ready for requests
*
* Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
* avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
* greater than 2x the number slots needed to satisfy a device->max_xor
* request.
* */
static int iop_adma_alloc_chan_resources(struct dma_chan *chan,
struct dma_client *client)
{
char *hw_desc;
int idx;
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *slot = NULL;
int init = iop_chan->slots_allocated ? 0 : 1;
struct iop_adma_platform_data *plat_data =
iop_chan->device->pdev->dev.platform_data;
int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
/* Allocate descriptor slots */
do {
idx = iop_chan->slots_allocated;
if (idx == num_descs_in_pool)
break;
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
printk(KERN_INFO "IOP ADMA Channel only initialized"
" %d descriptor slots", idx);
break;
}
hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
dma_async_tx_descriptor_init(&slot->async_tx, chan);
slot->async_tx.tx_submit = iop_adma_tx_submit;
INIT_LIST_HEAD(&slot->chain_node);
INIT_LIST_HEAD(&slot->slot_node);
INIT_LIST_HEAD(&slot->async_tx.tx_list);
hw_desc = (char *) iop_chan->device->dma_desc_pool;
slot->async_tx.phys =
(dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
slot->idx = idx;
spin_lock_bh(&iop_chan->lock);
iop_chan->slots_allocated++;
list_add_tail(&slot->slot_node, &iop_chan->all_slots);
spin_unlock_bh(&iop_chan->lock);
} while (iop_chan->slots_allocated < num_descs_in_pool);
if (idx && !iop_chan->last_used)
iop_chan->last_used = list_entry(iop_chan->all_slots.next,
struct iop_adma_desc_slot,
slot_node);
dev_dbg(iop_chan->device->common.dev,
"allocated %d descriptor slots last_used: %p\n",
iop_chan->slots_allocated, iop_chan->last_used);
/* initialize the channel and the chain with a null operation */
if (init) {
if (dma_has_cap(DMA_MEMCPY,
iop_chan->device->common.cap_mask))
iop_chan_start_null_memcpy(iop_chan);
else if (dma_has_cap(DMA_XOR,
iop_chan->device->common.cap_mask))
iop_chan_start_null_xor(iop_chan);
else
BUG();
}
return (idx > 0) ? idx : -ENOMEM;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_interrupt(grp_start, iop_chan);
grp_start->unmap_len = 0;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
__func__, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_memcpy(grp_start, flags);
iop_desc_set_byte_count(grp_start, iop_chan, len);
iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
iop_desc_set_memcpy_src_addr(grp_start, dma_src);
sw_desc->unmap_src_cnt = 1;
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
int value, size_t len, unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
__func__, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_memset(grp_start, flags);
iop_desc_set_byte_count(grp_start, iop_chan, len);
iop_desc_set_block_fill_val(grp_start, value);
iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
sw_desc->unmap_src_cnt = 1;
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
dev_dbg(iop_chan->device->common.dev,
"%s src_cnt: %d len: %u flags: %lx\n",
__func__, src_cnt, len, flags);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_xor(grp_start, src_cnt, flags);
iop_desc_set_byte_count(grp_start, iop_chan, len);
iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
sw_desc->unmap_src_cnt = src_cnt;
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
while (src_cnt--)
iop_desc_set_xor_src_addr(grp_start, src_cnt,
dma_src[src_cnt]);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
unsigned int src_cnt, size_t len, u32 *result,
unsigned long flags)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *sw_desc, *grp_start;
int slot_cnt, slots_per_op;
if (unlikely(!len))
return NULL;
dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
__func__, src_cnt, len);
spin_lock_bh(&iop_chan->lock);
slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
if (sw_desc) {
grp_start = sw_desc->group_head;
iop_desc_init_zero_sum(grp_start, src_cnt, flags);
iop_desc_set_zero_sum_byte_count(grp_start, len);
grp_start->xor_check_result = result;
pr_debug("\t%s: grp_start->xor_check_result: %p\n",
__func__, grp_start->xor_check_result);
sw_desc->unmap_src_cnt = src_cnt;
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
while (src_cnt--)
iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
dma_src[src_cnt]);
}
spin_unlock_bh(&iop_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static void iop_adma_free_chan_resources(struct dma_chan *chan)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
struct iop_adma_desc_slot *iter, *_iter;
int in_use_descs = 0;
iop_adma_slot_cleanup(iop_chan);
spin_lock_bh(&iop_chan->lock);
list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
chain_node) {
in_use_descs++;
list_del(&iter->chain_node);
}
list_for_each_entry_safe_reverse(
iter, _iter, &iop_chan->all_slots, slot_node) {
list_del(&iter->slot_node);
kfree(iter);
iop_chan->slots_allocated--;
}
iop_chan->last_used = NULL;
dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
__func__, iop_chan->slots_allocated);
spin_unlock_bh(&iop_chan->lock);
/* one is ok since we left it on there on purpose */
if (in_use_descs > 1)
printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
in_use_descs - 1);
}
/**
* iop_adma_is_complete - poll the status of an ADMA transaction
* @chan: ADMA channel handle
* @cookie: ADMA transaction identifier
*/
static enum dma_status iop_adma_is_complete(struct dma_chan *chan,
dma_cookie_t cookie,
dma_cookie_t *done,
dma_cookie_t *used)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
dma_cookie_t last_used;
dma_cookie_t last_complete;
enum dma_status ret;
last_used = chan->cookie;
last_complete = iop_chan->completed_cookie;
if (done)
*done = last_complete;
if (used)
*used = last_used;
ret = dma_async_is_complete(cookie, last_complete, last_used);
if (ret == DMA_SUCCESS)
return ret;
iop_adma_slot_cleanup(iop_chan);
last_used = chan->cookie;
last_complete = iop_chan->completed_cookie;
if (done)
*done = last_complete;
if (used)
*used = last_used;
return dma_async_is_complete(cookie, last_complete, last_used);
}
static irqreturn_t iop_adma_eot_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
dev_dbg(chan->device->common.dev, "%s\n", __func__);
tasklet_schedule(&chan->irq_tasklet);
iop_adma_device_clear_eot_status(chan);
return IRQ_HANDLED;
}
static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
dev_dbg(chan->device->common.dev, "%s\n", __func__);
tasklet_schedule(&chan->irq_tasklet);
iop_adma_device_clear_eoc_status(chan);
return IRQ_HANDLED;
}
static irqreturn_t iop_adma_err_handler(int irq, void *data)
{
struct iop_adma_chan *chan = data;
unsigned long status = iop_chan_get_status(chan);
dev_printk(KERN_ERR, chan->device->common.dev,
"error ( %s%s%s%s%s%s%s)\n",
iop_is_err_int_parity(status, chan) ? "int_parity " : "",
iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
iop_is_err_split_tx(status, chan) ? "split_tx " : "");
iop_adma_device_clear_err_status(chan);
BUG();
return IRQ_HANDLED;
}
static void iop_adma_issue_pending(struct dma_chan *chan)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
if (iop_chan->pending) {
iop_chan->pending = 0;
iop_chan_append(iop_chan);
}
}
/*
* Perform a transaction to verify the HW works.
*/
#define IOP_ADMA_TEST_SIZE 2000
static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device)
{
int i;
void *src, *dest;
dma_addr_t src_dma, dest_dma;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
struct dma_async_tx_descriptor *tx;
int err = 0;
struct iop_adma_chan *iop_chan;
dev_dbg(device->common.dev, "%s\n", __func__);
src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
if (!src)
return -ENOMEM;
dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
if (!dest) {
kfree(src);
return -ENOMEM;
}
/* Fill in src buffer */
for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
((u8 *) src)[i] = (u8)i;
/* Start copy, using first DMA channel */
dma_chan = container_of(device->common.channels.next,
struct dma_chan,
device_node);
if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
err = -ENODEV;
goto out;
}
dest_dma = dma_map_single(dma_chan->device->dev, dest,
IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
src_dma = dma_map_single(dma_chan->device->dev, src,
IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
IOP_ADMA_TEST_SIZE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
cookie = iop_adma_tx_submit(tx);
iop_adma_issue_pending(dma_chan);
msleep(1);
if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
DMA_SUCCESS) {
dev_printk(KERN_ERR, dma_chan->device->dev,
"Self-test copy timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
iop_chan = to_iop_adma_chan(dma_chan);
dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
dev_printk(KERN_ERR, dma_chan->device->dev,
"Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
free_resources:
iop_adma_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
return err;
}
#define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
static int __devinit
iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device)
{
int i, src_idx;
struct page *dest;
struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
dma_addr_t dma_addr, dest_dma;
struct dma_async_tx_descriptor *tx;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
u8 cmp_byte = 0;
u32 cmp_word;
u32 zero_sum_result;
int err = 0;
struct iop_adma_chan *iop_chan;
dev_dbg(device->common.dev, "%s\n", __func__);
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
if (!xor_srcs[src_idx])
while (src_idx--) {
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
}
dest = alloc_page(GFP_KERNEL);
if (!dest)
while (src_idx--) {
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
/* Fill in src buffers */
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
u8 *ptr = page_address(xor_srcs[src_idx]);
for (i = 0; i < PAGE_SIZE; i++)
ptr[i] = (1 << src_idx);
}
for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
cmp_byte ^= (u8) (1 << src_idx);
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
(cmp_byte << 8) | cmp_byte;
memset(page_address(dest), 0, PAGE_SIZE);
dma_chan = container_of(device->common.channels.next,
struct dma_chan,
device_node);
if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
err = -ENODEV;
goto out;
}
/* test xor */
dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
0, PAGE_SIZE, DMA_TO_DEVICE);
tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
cookie = iop_adma_tx_submit(tx);
iop_adma_issue_pending(dma_chan);
msleep(8);
if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
DMA_SUCCESS) {
dev_printk(KERN_ERR, dma_chan->device->dev,
"Self-test xor timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
iop_chan = to_iop_adma_chan(dma_chan);
dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
u32 *ptr = page_address(dest);
if (ptr[i] != cmp_word) {
dev_printk(KERN_ERR, dma_chan->device->dev,
"Self-test xor failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
}
dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
PAGE_SIZE, DMA_TO_DEVICE);
/* skip zero sum if the capability is not present */
if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask))
goto free_resources;