From e30eddc0aeb368814d2bbe0031e6b6ed768bdfcf Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@suren.me>
Date: Wed, 18 Nov 2015 06:28:28 +0100
Subject: Enforce 64-bit dma mask from IPEDMA if supported

---
 driver/ioctl.c     | 30 ++++++++++++++++++++++++++++++
 driver/pciDriver.h |  3 +++
 2 files changed, 33 insertions(+)

(limited to 'driver')

diff --git a/driver/ioctl.c b/driver/ioctl.c
index 2d4af73..a78d366 100644
--- a/driver/ioctl.c
+++ b/driver/ioctl.c
@@ -406,6 +406,33 @@ static int ioctl_clear_ioq(pcidriver_privdata_t *privdata, unsigned long arg)
 #endif
 }
 
+
+/**
+ *
+ * Sets DMA mask for the following DMA mappings.
+ *
+ * @param arg Not a pointer, but a number of bits
+ *
+ */
+static int ioctl_set_dma_mask(pcidriver_privdata_t *privdata, unsigned long arg)
+{
+	int err;
+
+	if ((arg < 24) && (arg > 63))
+		return -EINVAL;
+
+	err = pci_set_dma_mask(privdata->pdev, DMA_BIT_MASK(arg));
+	if (err < 0) {
+	    printk(KERN_ERR "pci_set_dma_mask(%lu) failed\n", arg);
+	    return err;
+	}
+	
+	printk(KERN_ERR "pci_set_dma_mask(%lu) successeded\n", arg);
+
+	return 0;
+}
+
+
 /**
  *
  * This function handles all ioctl file operations.
@@ -465,6 +492,9 @@ long pcidriver_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		case PCIDRIVER_IOC_CLEAR_IOQ:
 			return ioctl_clear_ioq(privdata, arg);
 
+		case PCIDRIVER_IOC_SET_DMA_MASK:
+			return ioctl_set_dma_mask(privdata, arg);
+
 		default:
 			return -EINVAL;
 	}
diff --git a/driver/pciDriver.h b/driver/pciDriver.h
index f16b721..845fc15 100644
--- a/driver/pciDriver.h
+++ b/driver/pciDriver.h
@@ -217,4 +217,7 @@ typedef struct {
 /* Clear interrupt queues */
 #define PCIDRIVER_IOC_CLEAR_IOQ   _IO(   PCIDRIVER_IOC_MAGIC, PCIDRIVER_IOC_BASE + 13 )
 
+#define PCIDRIVER_IOC_SET_DMA_MASK	_IO(  PCIDRIVER_IOC_MAGIC, PCIDRIVER_IOC_BASE + 14 )
+
+
 #endif
-- 
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