From: Lior Amsalem <alior@xxxxxxxxxxx>
Although the driver supported multiple-slot allocation, only one slot was
ever allocated for each transaction. So, given we have no users of the
multi-slot support, we can remove it and greatly simplify the code.
Signed-off-by: Lior Amsalem <alior@xxxxxxxxxxx>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
---
drivers/dma/mv_xor.c | 116 +++++++++++++--------------------------------------
drivers/dma/mv_xor.h | 9 +---
2 files changed, 32 insertions(+), 93 deletions(-)
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 1e43f18..a30e221 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -45,19 +45,15 @@ static void mv_xor_issue_pending(struct dma_chan *chan);
#define mv_chan_to_devp(chan) \
((chan)->dmadev.dev)
-static void mv_desc_init(struct mv_xor_desc_slot *desc, unsigned long flags)
+static void mv_desc_init(struct mv_xor_desc_slot *desc,
+ dma_addr_t addr, u32 byte_count)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
hw_desc->status = (1 << 31);
hw_desc->phy_next_desc = 0;
hw_desc->desc_command = (1 << 31);
-}
-
-static void mv_desc_set_byte_count(struct mv_xor_desc_slot *desc,
- u32 byte_count)
-{
- struct mv_xor_desc *hw_desc = desc->hw_desc;
+ hw_desc->phy_dest_addr = addr;
hw_desc->byte_count = byte_count;
}
@@ -75,13 +71,6 @@ static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc)
hw_desc->phy_next_desc = 0;
}
-static void mv_desc_set_dest_addr(struct mv_xor_desc_slot *desc,
- dma_addr_t addr)
-{
- struct mv_xor_desc *hw_desc = desc->hw_desc;
- hw_desc->phy_dest_addr = addr;
-}
-
static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc,
int index, dma_addr_t addr)
{
@@ -188,11 +177,6 @@ static char mv_chan_is_busy(struct mv_xor_chan *chan)
return (state == 1) ? 1 : 0;
}
-static int mv_chan_xor_slot_count(size_t len, int src_cnt)
-{
- return 1;
-}
-
/**
* mv_xor_free_slots - flags descriptor slots for reuse
* @slot: Slot to free
@@ -204,7 +188,7 @@ static void mv_xor_free_slots(struct mv_xor_chan *mv_chan,
dev_dbg(mv_chan_to_devp(mv_chan), "%s %d slot %p\n",
__func__, __LINE__, slot);
- slot->slots_per_op = 0;
+ slot->slot_used = 0;
}
@@ -222,7 +206,7 @@ static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan,
/* set the hardware chain */
mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys);
- mv_chan->pending += sw_desc->slot_cnt;
+ mv_chan->pending++;
mv_xor_issue_pending(&mv_chan->dmachan);
}
@@ -243,8 +227,6 @@ mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
desc->async_tx.callback_param);
dma_descriptor_unmap(&desc->async_tx);
- if (desc->group_head)
- desc->group_head = NULL;
}
/* run dependent operations */
@@ -361,19 +343,16 @@ static void mv_xor_tasklet(unsigned long data)
}
static struct mv_xor_desc_slot *
-mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots,
- int slots_per_op)
+mv_xor_alloc_slot(struct mv_xor_chan *mv_chan)
{
- struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL;
- LIST_HEAD(chain);
- int slots_found, retry = 0;
+ struct mv_xor_desc_slot *iter, *_iter;
+ int 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 = mv_chan->last_used;
else
@@ -383,55 +362,29 @@ retry:
list_for_each_entry_safe_continue(
iter, _iter, &mv_chan->all_slots, slot_node) {
+
prefetch(_iter);
prefetch(&_iter->async_tx);
- if (iter->slots_per_op) {
+ if (iter->slot_used) {
/* 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++)
- alloc_start = iter;
-
- if (slots_found == num_slots) {
- struct mv_xor_desc_slot *alloc_tail = NULL;
- struct mv_xor_desc_slot *last_used = NULL;
- iter = alloc_start;
- while (num_slots) {
- int i;
-
- /* pre-ack all but the last descriptor */
- 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 mv_xor_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->tx_list);
- mv_chan->last_used = last_used;
- mv_desc_clear_next_desc(alloc_start);
- mv_desc_clear_next_desc(alloc_tail);
- return alloc_tail;
- }
+ /* pre-ack descriptor */
+ async_tx_ack(&iter->async_tx);
+
+ iter->slot_used = 1;
+ INIT_LIST_HEAD(&iter->chain_node);
+ iter->async_tx.cookie = -EBUSY;
+ mv_chan->last_used = iter;
+ mv_desc_clear_next_desc(iter);
+
+ return iter;
+
}
if (!retry++)
goto retry;
@@ -448,7 +401,7 @@ mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
- struct mv_xor_desc_slot *grp_start, *old_chain_tail;
+ struct mv_xor_desc_slot *old_chain_tail;
dma_cookie_t cookie;
int new_hw_chain = 1;
@@ -456,27 +409,24 @@ mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
"%s sw_desc %p: async_tx %p\n",
__func__, sw_desc, &sw_desc->async_tx);
- grp_start = sw_desc->group_head;
-
spin_lock_bh(&mv_chan->lock);
cookie = dma_cookie_assign(tx);
if (list_empty(&mv_chan->chain))
- list_splice_init(&sw_desc->tx_list, &mv_chan->chain);
+ list_add_tail(&sw_desc->chain_node, &mv_chan->chain);
else {
new_hw_chain = 0;
old_chain_tail = list_entry(mv_chan->chain.prev,
struct mv_xor_desc_slot,
chain_node);
- list_splice_init(&grp_start->tx_list,
- &old_chain_tail->chain_node);
+ list_add_tail(&sw_desc->chain_node, &mv_chan->chain);
dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %pa\n",
&old_chain_tail->async_tx.phys);
/* fix up the hardware chain */
- mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
+ mv_desc_set_next_desc(old_chain_tail, sw_desc->async_tx.phys);
/* if the channel is not busy */
if (!mv_chan_is_busy(mv_chan)) {
@@ -491,7 +441,7 @@ mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
}
if (new_hw_chain)
- mv_xor_start_new_chain(mv_chan, grp_start);
+ mv_xor_start_new_chain(mv_chan, sw_desc);
spin_unlock_bh(&mv_chan->lock);
@@ -525,7 +475,6 @@ static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
slot->async_tx.tx_submit = mv_xor_tx_submit;
INIT_LIST_HEAD(&slot->chain_node);
INIT_LIST_HEAD(&slot->slot_node);
- INIT_LIST_HEAD(&slot->tx_list);
dma_desc = mv_chan->dma_desc_pool;
slot->async_tx.phys = dma_desc + idx * MV_XOR_SLOT_SIZE;
slot->idx = idx++;
@@ -553,8 +502,7 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
- struct mv_xor_desc_slot *sw_desc, *grp_start;
- int slot_cnt;
+ struct mv_xor_desc_slot *sw_desc;
if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
return NULL;
@@ -566,19 +514,15 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
__func__, src_cnt, len, &dest, flags);
spin_lock_bh(&mv_chan->lock);
- slot_cnt = mv_chan_xor_slot_count(len, src_cnt);
- sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
+ sw_desc = mv_xor_alloc_slot(mv_chan);
if (sw_desc) {
sw_desc->type = DMA_XOR;
sw_desc->async_tx.flags = flags;
- grp_start = sw_desc->group_head;
- mv_desc_init(grp_start, flags);
- mv_desc_set_byte_count(grp_start, len);
- mv_desc_set_dest_addr(sw_desc->group_head, dest);
+ mv_desc_init(sw_desc, dest, len);
sw_desc->unmap_src_cnt = src_cnt;
sw_desc->unmap_len = len;
while (src_cnt--)
- mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]);
+ mv_desc_set_src_addr(sw_desc, src_cnt, src[src_cnt]);
}
spin_unlock_bh(&mv_chan->lock);
dev_dbg(mv_chan_to_devp(mv_chan),
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index d074922..e03021e 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -110,9 +110,7 @@ struct mv_xor_chan {
* @completed_node: node on the mv_xor_chan.completed_slots list
* @hw_desc: virtual address of the hardware descriptor chain
* @phys: hardware address of the hardware descriptor chain
- * @group_head: first operation in a transaction
- * @slot_cnt: total slots used in an transaction (group of operations)
- * @slots_per_op: number of slots per operation
+ * @slot_used: slot in use or not
* @idx: pool index
* @unmap_src_cnt: number of xor sources
* @unmap_len: transaction bytecount
@@ -127,14 +125,11 @@ struct mv_xor_desc_slot {
struct list_head completed_node;
enum dma_transaction_type type;
void *hw_desc;
- struct mv_xor_desc_slot *group_head;
- u16 slot_cnt;
- u16 slots_per_op;
+ u16 slot_used;
u16 idx;
u16 unmap_src_cnt;
u32 value;
size_t unmap_len;
- struct list_head tx_list;
struct dma_async_tx_descriptor async_tx;
union {
u32 *xor_check_result;
--
2.0.1
--
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