async_tx: build-time toggling of async_{syndrome,xor}_val dma support

ioat3.2 does not support asynchronous error notifications which makes
the driver experience latencies when non-zero pq validate results are
expected.  Provide a mechanism for turning off async_xor_val and
async_syndrome_val via Kconfig.  This approach is generally useful for
any driver that specifies ASYNC_TX_DISABLE_CHANNEL_SWITCH and would like
to force the async_tx api to fall back to the synchronous path for
certain operations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig
index e5aeb2b..e28e276 100644 (file)
--- a/crypto/async_tx/Kconfig
+++ b/crypto/async_tx/Kconfig
@@ -23,3 +23,8 @@ config ASYNC_RAID6_RECOV
        select ASYNC_CORE
        select ASYNC_PQ
 
+config ASYNC_TX_DISABLE_PQ_VAL_DMA
+       bool
+
+config ASYNC_TX_DISABLE_XOR_VAL_DMA
+       bool

diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
index 6b5cc4f..ec87f53 100644 (file)
--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -240,6 +240,16 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
 }
 EXPORT_SYMBOL_GPL(async_gen_syndrome);
 
+static inline struct dma_chan *
+pq_val_chan(struct async_submit_ctl *submit, struct page **blocks, int disks, size_t len)
+{
+       #ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
+       return NULL;
+       #endif
+       return async_tx_find_channel(submit, DMA_PQ_VAL, NULL, 0,  blocks,
+                                    disks, len);
+}
+
 /**
  * async_syndrome_val - asynchronously validate a raid6 syndrome
  * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1
@@ -260,9 +270,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
                   size_t len, enum sum_check_flags *pqres, struct page *spare,
                   struct async_submit_ctl *submit)
 {
-       struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ_VAL,
-                                                     NULL, 0,  blocks, disks,
-                                                     len);
+       struct dma_chan *chan = pq_val_chan(submit, blocks, disks, len);
        struct dma_device *device = chan ? chan->device : NULL;
        struct dma_async_tx_descriptor *tx;
        unsigned char coefs[disks-2];

diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 79182dc..079ae8c 100644 (file)
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -234,6 +234,17 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len)
                memcmp(a, a + 4, len - 4) == 0);
 }
 
+static inline struct dma_chan *
+xor_val_chan(struct async_submit_ctl *submit, struct page *dest,
+                struct page **src_list, int src_cnt, size_t len)
+{
+       #ifdef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA
+       return NULL;
+       #endif
+       return async_tx_find_channel(submit, DMA_XOR_VAL, &dest, 1, src_list,
+                                    src_cnt, len);
+}
+
 /**
  * async_xor_val - attempt a xor parity check with a dma engine.
  * @dest: destination page used if the xor is performed synchronously
@@ -255,9 +266,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
              int src_cnt, size_t len, enum sum_check_flags *result,
              struct async_submit_ctl *submit)
 {
-       struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL,
-                                                     &dest, 1, src_list,
-                                                     src_cnt, len);
+       struct dma_chan *chan = xor_val_chan(submit, dest, src_list, src_cnt, len);
        struct dma_device *device = chan ? chan->device : NULL;
        struct dma_async_tx_descriptor *tx = NULL;
        dma_addr_t *dma_src = NULL;

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 5903a88..b401dad 100644 (file)
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -26,6 +26,8 @@ config INTEL_IOATDMA
        select DMA_ENGINE
        select DCA
        select ASYNC_TX_DISABLE_CHANNEL_SWITCH
+       select ASYNC_TX_DISABLE_PQ_VAL_DMA
+       select ASYNC_TX_DISABLE_XOR_VAL_DMA
        help
          Enable support for the Intel(R) I/OAT DMA engine present
          in recent Intel Xeon chipsets.

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index b6442f0..8f99354 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -632,16 +632,22 @@ static bool device_has_all_tx_types(struct dma_device *device)
        #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE)
        if (!dma_has_cap(DMA_XOR, device->cap_mask))
                return false;
+
+       #ifndef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA
        if (!dma_has_cap(DMA_XOR_VAL, device->cap_mask))
                return false;
        #endif
+       #endif
 
        #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE)
        if (!dma_has_cap(DMA_PQ, device->cap_mask))
                return false;
+
+       #ifndef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
        if (!dma_has_cap(DMA_PQ_VAL, device->cap_mask))
                return false;
        #endif
+       #endif
 
        return true;
 }

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 252cf2d..189788f 100644 (file)
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1206,6 +1206,16 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
                device->timer_fn = ioat2_timer_event;
        }
 
+       #ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
+       dma_cap_clear(DMA_PQ_VAL, dma->cap_mask);
+       dma->device_prep_dma_pq_val = NULL;
+       #endif
+
+       #ifdef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA
+       dma_cap_clear(DMA_XOR_VAL, dma->cap_mask);
+       dma->device_prep_dma_xor_val = NULL;
+       #endif
+
        /* -= IOAT ver.3 workarounds =- */
        /* Write CHANERRMSK_INT with 3E07h to mask out the errors
         * that can cause stability issues for IOAT ver.3