dmaengine: idma64: Update bytes_transferred field

Currently when 8250 data transfer is done, bytes_tranferred always returns
0 at /sys/devices/pci0000\:\:**.*/dma/dma*chan*/bytes_transferred.
In many cases it gives false impression that data is not being
trasferred via DMA.

So, updating the bytes_transferred field to count the bytes
whenever there is data transfer using idma64.

Co-developed-by: Srikanth Thokala <srikanth.thokala@intel.com>
Signed-off-by: Srikanth Thokala <srikanth.thokala@intel.com>
Signed-off-by: Aman Kumar <aman.kumar@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230203121702.15725-1-aman.kumar@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idma64.c

@@ -137,8 +137,11 @@ static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 		u32 status_err, u32 status_xfer)
 {
 	struct idma64_chan *idma64c = &idma64->chan[c];
+	struct dma_chan_percpu *stat;
 	struct idma64_desc *desc;
 
+	stat = this_cpu_ptr(idma64c->vchan.chan.local);
+
 	spin_lock(&idma64c->vchan.lock);
 	desc = idma64c->desc;
 	if (desc) {
@@ -149,6 +152,7 @@ static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 			dma_writel(idma64, CLEAR(XFER), idma64c->mask);
 			desc->status = DMA_COMPLETE;
 			vchan_cookie_complete(&desc->vdesc);
+			stat->bytes_transferred += desc->length;
 			idma64_start_transfer(idma64c);
 		}