async_tx: replace 'int_en' with operation preparation flags

Pass a full set of flags to drivers' per-operation 'prep' routines.
Currently the only flag passed is DMA_PREP_INTERRUPT.  The expectation is
that arch-specific async_tx_find_channel() implementations can exploit this
capability to find the best channel for an operation.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Reviewed-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

8 files changed, 62 insertions, 43 deletions

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index faca0bc52068..25dcf33bbc2d 100644
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -52,6 +52,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 
         if (device) {
                 dma_addr_t dma_dest, dma_src;
+                unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
 
                 dma_dest = dma_map_page(device->dev, dest, dest_offset, len,
                                         DMA_FROM_DEVICE);
@@ -60,7 +61,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
                                        DMA_TO_DEVICE);
 
                 tx = device->device_prep_dma_memcpy(chan, dma_dest, dma_src,
-                                                    len, cb_fn != NULL);
+                                                    len, dma_prep_flags);
         }
 
         if (tx) {
diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c
index 0c94851cfd37..8e98ab0cd37c 100644
--- a/crypto/async_tx/async_memset.c
+++ b/crypto/async_tx/async_memset.c
@@ -52,12 +52,13 @@ async_memset(struct page *dest, int val, unsigned int offset,
 
         if (device) {
                 dma_addr_t dma_dest;
+                unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
 
                 dma_dest = dma_map_page(device->dev, dest, offset, len,
                                         DMA_FROM_DEVICE);
 
                 tx = device->device_prep_dma_memset(chan, dma_dest, val, len,
-                                                    cb_fn != NULL);
+                                                    dma_prep_flags);
         }
 
         if (tx) {
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 12cba1a4205b..68d2fe4465d8 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -45,6 +45,7 @@ do_async_xor(struct dma_device *device,
         dma_addr_t *dma_src = (dma_addr_t *) src_list;
         struct dma_async_tx_descriptor *tx;
         int i;
+        unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
 
         pr_debug("%s: len: %zu\n", __FUNCTION__, len);
 
@@ -60,7 +61,7 @@ do_async_xor(struct dma_device *device,
          * in case they can not provide a descriptor
          */
         tx = device->device_prep_dma_xor(chan, dma_dest, dma_src, src_cnt, len,
-                                         cb_fn != NULL);
+                                         dma_prep_flags);
         if (!tx) {
                 if (depend_tx)
                         dma_wait_for_async_tx(depend_tx);
@@ -68,7 +69,7 @@ do_async_xor(struct dma_device *device,
                 while (!tx)
                         tx = device->device_prep_dma_xor(chan, dma_dest,
                                                          dma_src, src_cnt, len,
-                                                         cb_fn != NULL);
+                                                         dma_prep_flags);
         }
 
         async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
@@ -268,6 +269,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
 
         if (device) {
                 dma_addr_t *dma_src = (dma_addr_t *) src_list;
+                unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
                 int i;
 
                 pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
@@ -278,7 +280,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
 
                 tx = device->device_prep_dma_zero_sum(chan, dma_src, src_cnt,
                                                       len, result,
-                                                      cb_fn != NULL);
+                                                      dma_prep_flags);
                 if (!tx) {
                         if (depend_tx)
                                 dma_wait_for_async_tx(depend_tx);
@@ -286,7 +288,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
                         while (!tx)
                                 tx = device->device_prep_dma_zero_sum(chan,
                                         dma_src, src_cnt, len, result,
-                                        cb_fn != NULL);
+                                        dma_prep_flags);
                 }
 
                 async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 5bcfc55a2776..dff38accc5c1 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -701,7 +701,7 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy(
                                                 dma_addr_t dma_dest,
                                                 dma_addr_t dma_src,
                                                 size_t len,
-                                                int int_en)
+                                                unsigned long flags)
 {
         struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
         struct ioat_desc_sw *new;
@@ -724,7 +724,7 @@ static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy(
                                                 dma_addr_t dma_dest,
                                                 dma_addr_t dma_src,
                                                 size_t len,
-                                                int int_en)
+                                                unsigned long flags)
 {
         struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
         struct ioat_desc_sw *new;
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index eda841c60690..3986d54492bd 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -537,7 +537,7 @@ iop_adma_prep_dma_interrupt(struct dma_chan *chan)
 
 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, int int_en)
+                         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;
@@ -555,7 +555,7 @@ iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
         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, int_en);
+                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);
@@ -569,7 +569,7 @@ iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
 
 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, int int_en)
+                         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;
@@ -587,7 +587,7 @@ iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
         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, int_en);
+                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);
@@ -602,7 +602,7 @@ iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
 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,
-                      int int_en)
+                      unsigned long flags)
 {
         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
         struct iop_adma_desc_slot *sw_desc, *grp_start;
@@ -613,15 +613,15 @@ iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
         BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
 
         dev_dbg(iop_chan->device->common.dev,
-                "%s src_cnt: %d len: %u int_en: %d\n",
-                __FUNCTION__, src_cnt, len, int_en);
+                "%s src_cnt: %d len: %u flags: %lx\n",
+                __FUNCTION__, 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, int_en);
+                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;
@@ -638,7 +638,7 @@ iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
 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,
-                           int int_en)
+                           unsigned long flags)
 {
         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
         struct iop_adma_desc_slot *sw_desc, *grp_start;
@@ -655,7 +655,7 @@ iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
         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, int_en);
+                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",
diff --git a/include/asm-arm/arch-iop13xx/adma.h b/include/asm-arm/arch-iop13xx/adma.h
index 04006c1c5fd7..efd9a5eb1008 100644
--- a/include/asm-arm/arch-iop13xx/adma.h
+++ b/include/asm-arm/arch-iop13xx/adma.h
@@ -247,7 +247,7 @@ static inline u32 iop_desc_get_src_count(struct iop_adma_desc_slot *desc,
 }
 
 static inline void
-iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, int int_en)
+iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, unsigned long flags)
 {
         struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
         union {
@@ -257,13 +257,13 @@ iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, int int_en)
 
         u_desc_ctrl.value = 0;
         u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
         hw_desc->crc_addr = 0;
 }
 
 static inline void
-iop_desc_init_memset(struct iop_adma_desc_slot *desc, int int_en)
+iop_desc_init_memset(struct iop_adma_desc_slot *desc, unsigned long flags)
 {
         struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
         union {
@@ -274,14 +274,15 @@ iop_desc_init_memset(struct iop_adma_desc_slot *desc, int int_en)
         u_desc_ctrl.value = 0;
         u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */
         u_desc_ctrl.field.block_fill_en = 1;
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
         hw_desc->crc_addr = 0;
 }
 
 /* to do: support buffers larger than ADMA_MAX_BYTE_COUNT */
 static inline void
-iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt,
+                  unsigned long flags)
 {
         struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
         union {
@@ -292,7 +293,7 @@ iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
         u_desc_ctrl.value = 0;
         u_desc_ctrl.field.src_select = src_cnt - 1;
         u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
         hw_desc->crc_addr = 0;
 
@@ -301,7 +302,8 @@ iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
 
 /* to do: support buffers larger than ADMA_MAX_BYTE_COUNT */
 static inline int
-iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt,
+                       unsigned long flags)
 {
         struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
         union {
@@ -314,7 +316,7 @@ iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
         u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */
         u_desc_ctrl.field.zero_result = 1;
         u_desc_ctrl.field.status_write_back_en = 1;
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
         hw_desc->crc_addr = 0;
 
diff --git a/include/asm-arm/hardware/iop3xx-adma.h b/include/asm-arm/hardware/iop3xx-adma.h
index 10834b54f681..5c529e6a5e3b 100644
--- a/include/asm-arm/hardware/iop3xx-adma.h
+++ b/include/asm-arm/hardware/iop3xx-adma.h
@@ -414,7 +414,7 @@ static inline void iop3xx_aau_desc_set_src_addr(struct iop3xx_desc_aau *hw_desc,
 }
 
 static inline void
-iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, int int_en)
+iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, unsigned long flags)
 {
         struct iop3xx_desc_dma *hw_desc = desc->hw_desc;
         union {
@@ -425,14 +425,14 @@ iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, int int_en)
         u_desc_ctrl.value = 0;
         u_desc_ctrl.field.mem_to_mem_en = 1;
         u_desc_ctrl.field.pci_transaction = 0xe; /* memory read block */
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
         hw_desc->upper_pci_src_addr = 0;
         hw_desc->crc_addr = 0;
 }
 
 static inline void
-iop_desc_init_memset(struct iop_adma_desc_slot *desc, int int_en)
+iop_desc_init_memset(struct iop_adma_desc_slot *desc, unsigned long flags)
 {
         struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
         union {
@@ -443,12 +443,13 @@ iop_desc_init_memset(struct iop_adma_desc_slot *desc, int int_en)
         u_desc_ctrl.value = 0;
         u_desc_ctrl.field.blk1_cmd_ctrl = 0x2; /* memory block fill */
         u_desc_ctrl.field.dest_write_en = 1;
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
 }
 
 static inline u32
-iop3xx_desc_init_xor(struct iop3xx_desc_aau *hw_desc, int src_cnt, int int_en)
+iop3xx_desc_init_xor(struct iop3xx_desc_aau *hw_desc, int src_cnt,
+                     unsigned long flags)
 {
         int i, shift;
         u32 edcr;
@@ -509,21 +510,23 @@ iop3xx_desc_init_xor(struct iop3xx_desc_aau *hw_desc, int src_cnt, int int_en)
 
         u_desc_ctrl.field.dest_write_en = 1;
         u_desc_ctrl.field.blk1_cmd_ctrl = 0x7; /* direct fill */
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
 
         return u_desc_ctrl.value;
 }
 
 static inline void
-iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt,
+                  unsigned long flags)
 {
-        iop3xx_desc_init_xor(desc->hw_desc, src_cnt, int_en);
+        iop3xx_desc_init_xor(desc->hw_desc, src_cnt, flags);
 }
 
 /* return the number of operations */
 static inline int
-iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt,
+                       unsigned long flags)
 {
         int slot_cnt = desc->slot_cnt, slots_per_op = desc->slots_per_op;
         struct iop3xx_desc_aau *hw_desc, *prev_hw_desc, *iter;
@@ -538,10 +541,10 @@ iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
         for (i = 0, j = 0; (slot_cnt -= slots_per_op) >= 0;
                 i += slots_per_op, j++) {
                 iter = iop_hw_desc_slot_idx(hw_desc, i);
-                u_desc_ctrl.value = iop3xx_desc_init_xor(iter, src_cnt, int_en);
+                u_desc_ctrl.value = iop3xx_desc_init_xor(iter, src_cnt, flags);
                 u_desc_ctrl.field.dest_write_en = 0;
                 u_desc_ctrl.field.zero_result_en = 1;
-                u_desc_ctrl.field.int_en = int_en;
+                u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
                 iter->desc_ctrl = u_desc_ctrl.value;
 
                 /* for the subsequent descriptors preserve the store queue
@@ -559,7 +562,8 @@ iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
 }
 
 static inline void
-iop_desc_init_null_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+iop_desc_init_null_xor(struct iop_adma_desc_slot *desc, int src_cnt,
+                       unsigned long flags)
 {
         struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
         union {
@@ -591,7 +595,7 @@ iop_desc_init_null_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
         }
 
         u_desc_ctrl.field.dest_write_en = 0;
-        u_desc_ctrl.field.int_en = int_en;
+        u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT;
         hw_desc->desc_ctrl = u_desc_ctrl.value;
 }
 
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index b0864f5b729d..acbb364674ff 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -95,6 +95,15 @@ enum dma_transaction_type {
 #define DMA_TX_TYPE_END (DMA_INTERRUPT + 1)
 
 /**
+ * enum dma_prep_flags - DMA flags to augment operation preparation
+ * @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of
+ *      this transaction
+ */
+enum dma_prep_flags {
+        DMA_PREP_INTERRUPT = (1 << 0),
+};
+
+/**
  * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t.
  * See linux/cpumask.h
  */
@@ -274,16 +283,16 @@ struct dma_device {
 
         struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(
                 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
-                size_t len, int int_en);
+                size_t len, unsigned long flags);
         struct dma_async_tx_descriptor *(*device_prep_dma_xor)(
                 struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
-                unsigned int src_cnt, size_t len, int int_en);
+                unsigned int src_cnt, size_t len, unsigned long flags);
         struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)(
                 struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
-                size_t len, u32 *result, int int_en);
+                size_t len, u32 *result, unsigned long flags);
         struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
                 struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
-                int int_en);
+                unsigned long flags);
         struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
                 struct dma_chan *chan);