dmaengine: provide a common function for completing a dma descriptor
Russell King - ARM Linux [Tue, 6 Mar 2012 22:35:07 +0000 (22:35 +0000)]
Provide a common function to do the cookie mechanics for completing
a DMA descriptor.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Cherry-picked from mainline commit
f7fbce07c6ce26a25b4e0cb5f241c361fde87901

Change-Id: I0b0a9d4ad538db4fda227cc91436c44bc4a6f206
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/93781
Reviewed-by: Automatic_Commit_Validation_User

19 files changed:
drivers/dma/amba-pl08x.c
drivers/dma/at_hdmac.c
drivers/dma/coh901318.c
drivers/dma/dmaengine.h
drivers/dma/dw_dmac.c
drivers/dma/ep93xx_dma.c
drivers/dma/fsldma.c
drivers/dma/imx-dma.c
drivers/dma/imx-sdma.c
drivers/dma/intel_mid_dma.c
drivers/dma/ioat/dma.c
drivers/dma/ioat/dma_v2.c
drivers/dma/ioat/dma_v3.c
drivers/dma/ipu/ipu_idmac.c
drivers/dma/mxs-dma.c
drivers/dma/pl330.c
drivers/dma/ste_dma40.c
drivers/dma/timb_dma.c
drivers/dma/txx9dmac.c

index 9bb97f1..8376602 100644 (file)
@@ -1551,7 +1551,7 @@ static void pl08x_tasklet(unsigned long data)
 
        if (txd) {
                /* Update last completed */
-               plchan->chan.completed_cookie = txd->tx.cookie;
+               dma_cookie_complete(&txd->tx);
        }
 
        /* If a new descriptor is queued, set it up plchan->at is NULL here */
index e2d9dcb..1727a7c 100644 (file)
@@ -245,7 +245,7 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
        dev_vdbg(chan2dev(&atchan->chan_common),
                "descriptor %u complete\n", txd->cookie);
 
-       atchan->chan_common.completed_cookie = txd->cookie;
+       dma_cookie_complete(txd);
 
        /* move children to free_list */
        list_splice_init(&desc->tx_list, &atchan->free_list);
index 9462e7f..ce8f045 100644 (file)
@@ -691,7 +691,7 @@ static void dma_tasklet(unsigned long data)
        callback_param = cohd_fin->desc.callback_param;
 
        /* sign this job as completed on the channel */
-       cohc->chan.completed_cookie = cohd_fin->desc.cookie;
+       dma_cookie_complete(&cohd_fin->desc);
 
        /* release the lli allocation and remove the descriptor */
        coh901318_lli_free(&cohc->base->pool, &cohd_fin->lli);
index 7692c86..47e0997 100644 (file)
@@ -5,6 +5,7 @@
 #ifndef DMAENGINE_H
 #define DMAENGINE_H
 
+#include <linux/bug.h>
 #include <linux/dmaengine.h>
 
 /**
@@ -27,4 +28,21 @@ static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx)
        return cookie;
 }
 
+/**
+ * dma_cookie_complete - complete a descriptor
+ * @tx: descriptor to complete
+ *
+ * Mark this descriptor complete by updating the channels completed
+ * cookie marker.  Zero the descriptors cookie to prevent accidental
+ * repeated completions.
+ *
+ * Note: caller is expected to hold a lock to prevent concurrency.
+ */
+static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx)
+{
+       BUG_ON(tx->cookie < DMA_MIN_COOKIE);
+       tx->chan->completed_cookie = tx->cookie;
+       tx->cookie = 0;
+}
+
 #endif
index 4a66609..d5be0e4 100644 (file)
@@ -228,7 +228,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
        dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie);
 
        spin_lock_irqsave(&dwc->lock, flags);
-       dwc->chan.completed_cookie = txd->cookie;
+       dma_cookie_complete(txd);
        if (callback_required) {
                callback = txd->callback;
                param = txd->callback_param;
index a0991bf..675a97c 100644 (file)
@@ -676,7 +676,7 @@ static void ep93xx_dma_tasklet(unsigned long data)
        desc = ep93xx_dma_get_active(edmac);
        if (desc) {
                if (desc->complete) {
-                       edmac->chan.completed_cookie = desc->txd.cookie;
+                       dma_cookie_complete(&desc->txd);
                        list_splice_init(&edmac->active, &list);
                }
                callback = desc->txd.callback;
index 8726c3a..1888276 100644 (file)
@@ -1081,8 +1081,8 @@ static void dma_do_tasklet(unsigned long data)
 
                desc = to_fsl_desc(chan->ld_running.prev);
                cookie = desc->async_tx.cookie;
+               dma_cookie_complete(&desc->async_tx);
 
-               chan->common.completed_cookie = cookie;
                chan_dbg(chan, "completed_cookie=%d\n", cookie);
        }
 
index bc1ea09..f4096df 100644 (file)
@@ -64,7 +64,7 @@ static void imxdma_handle(struct imxdma_channel *imxdmac)
 {
        if (imxdmac->desc.callback)
                imxdmac->desc.callback(imxdmac->desc.callback_param);
-       imxdmac->chan.completed_cookie = imxdmac->desc.cookie;
+       dma_cookie_complete(&imxdmac->desc);
 }
 
 static void imxdma_irq_handler(int channel, void *data)
index 9a27080..46909e4 100644 (file)
@@ -510,7 +510,7 @@ static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
        else
                sdmac->status = DMA_SUCCESS;
 
-       sdmac->chan.completed_cookie = sdmac->desc.cookie;
+       dma_cookie_complete(&sdmac->desc);
        if (sdmac->desc.callback)
                sdmac->desc.callback(sdmac->desc.callback_param);
        sdmac->last_completed = sdmac->desc.cookie;
index 79234a3..408d74b 100644 (file)
@@ -290,7 +290,7 @@ static void midc_descriptor_complete(struct intel_mid_dma_chan *midc,
        struct intel_mid_dma_lli        *llitem;
        void *param_txd = NULL;
 
-       midc->chan.completed_cookie = txd->cookie;
+       dma_cookie_complete(txd);
        callback_txd = txd->callback;
        param_txd = txd->callback_param;
 
index 5c06117..b0517c8 100644 (file)
@@ -600,8 +600,7 @@ static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete)
                 */
                dump_desc_dbg(ioat, desc);
                if (tx->cookie) {
-                       chan->common.completed_cookie = tx->cookie;
-                       tx->cookie = 0;
+                       dma_cookie_complete(tx);
                        ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw);
                        ioat->active -= desc->hw->tx_cnt;
                        if (tx->callback) {
index 17ecacb..e8e110f 100644 (file)
@@ -149,8 +149,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
                dump_desc_dbg(ioat, desc);
                if (tx->cookie) {
                        ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw);
-                       chan->common.completed_cookie = tx->cookie;
-                       tx->cookie = 0;
+                       dma_cookie_complete(tx);
                        if (tx->callback) {
                                tx->callback(tx->callback_param);
                                tx->callback = NULL;
index d4afac7..1bda46c 100644 (file)
@@ -277,9 +277,8 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
                dump_desc_dbg(ioat, desc);
                tx = &desc->txd;
                if (tx->cookie) {
-                       chan->common.completed_cookie = tx->cookie;
+                       dma_cookie_complete(tx);
                        ioat3_dma_unmap(ioat, desc, idx + i);
-                       tx->cookie = 0;
                        if (tx->callback) {
                                tx->callback(tx->callback_param);
                                tx->callback = NULL;
index 4a1dba7..fbc9034 100644 (file)
@@ -1310,7 +1310,7 @@ static irqreturn_t idmac_interrupt(int irq, void *dev_id)
        /* Flip the active buffer - even if update above failed */
        ichan->active_buffer = !ichan->active_buffer;
        if (done)
-               ichan->dma_chan.completed_cookie = desc->txd.cookie;
+               dma_cookie_complete(&desc->txd);
 
        callback = desc->txd.callback;
        callback_param = desc->txd.callback_param;
index c831c14..45b2128 100644 (file)
@@ -286,7 +286,7 @@ static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id)
                stat1 &= ~(1 << channel);
 
                if (mxs_chan->status == DMA_SUCCESS)
-                       mxs_chan->chan.completed_cookie = mxs_chan->desc.cookie;
+                       dma_cookie_complete(&mxs_chan->desc);
 
                /* schedule tasklet on this channel */
                tasklet_schedule(&mxs_chan->tasklet);
index a6aef72..1927a0e 100644 (file)
@@ -192,7 +192,7 @@ static void pl330_tasklet(unsigned long data)
        /* Pick up ripe tomatoes */
        list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
                if (desc->status == DONE) {
-                       pch->chan.completed_cookie = desc->txd.cookie;
+                       dma_cookie_complete(&desc->txd);
                        list_move_tail(&desc->node, &list);
                }
 
index d74adc1..f42f816 100644 (file)
@@ -1202,7 +1202,7 @@ static void dma_tasklet(unsigned long data)
                goto err;
 
        if (!d40d->cyclic)
-               d40c->chan.completed_cookie = d40d->txd.cookie;
+               dma_cookie_complete(&d40d->txd);
 
        /*
         * If terminating a channel pending_tx is set to zero.
index 946350c..621e15f 100644 (file)
@@ -285,7 +285,7 @@ static void __td_finish(struct timb_dma_chan *td_chan)
        else
                iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DLAR);
 */
-       td_chan->chan.completed_cookie = txd->cookie;
+       dma_cookie_complete(txd);
        td_chan->ongoing = false;
 
        callback = txd->callback;
index 3336a28..48af386 100644 (file)
@@ -411,7 +411,7 @@ txx9dmac_descriptor_complete(struct txx9dmac_chan *dc,
        dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n",
                 txd->cookie, desc);
 
-       dc->chan.completed_cookie = txd->cookie;
+       dma_cookie_complete(txd);
        callback = txd->callback;
        param = txd->callback_param;