dmaengine: idxd: set max_xfer and max_batch for RO device

Load the max_xfer_size and max_batch_size values from the values read from
registers to the shadow variables. This will allow the read-only device to
display the correct values for the sysfs attributes.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164971507673.2201761.11244446608988838897.stgit@djiang5-desk3.ch.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idxd/device.c

@@ -1031,6 +1031,9 @@ static int idxd_wq_load_config(struct idxd_wq *wq)
 
 	wq->priority = wq->wqcfg->priority;
 
+	wq->max_xfer_bytes = 1ULL << wq->wqcfg->max_xfer_shift;
+	wq->max_batch_size = 1ULL << wq->wqcfg->max_batch_shift;
+
 	for (i = 0; i < WQCFG_STRIDES(idxd); i++) {
 		wqcfg_offset = WQCFG_OFFSET(idxd, wq->id, i);
 		dev_dbg(dev, "WQ[%d][%d][%#x]: %#x\n", wq->id, i, wqcfg_offset, wq->wqcfg->bits[i]);