From: Shannon Nelson <redacted>
Date: Wed, 24 Jul 2019 10:49:09 -0700

On 7/23/19 4:05 PM, David Miller wrote:

quoted

From: Shannon Nelson <redacted>
Date: Tue, 23 Jul 2019 15:50:22 -0700

quoted

On 7/23/19 2:18 PM, David Miller wrote:

quoted

From: Shannon Nelson <redacted>
Date: Mon, 22 Jul 2019 14:40:06 -0700

quoted

+void ionic_init_devinfo(struct ionic_dev *idev)
+{
+ idev->dev_info.asic_type = ioread8(&idev->dev_info_regs->asic_type);
+ idev->dev_info.asic_rev = ioread8(&idev->dev_info_regs->asic_rev);
+
+	memcpy_fromio(idev->dev_info.fw_version,
+		      idev->dev_info_regs->fw_version,
+		      IONIC_DEVINFO_FWVERS_BUFLEN);
+
+	memcpy_fromio(idev->dev_info.serial_num,
+		      idev->dev_info_regs->serial_num,
+		      IONIC_DEVINFO_SERIAL_BUFLEN);

   ...

quoted

+	sig = ioread32(&idev->dev_info_regs->signature);

I think if you are going to use the io{read,write}{8,16,32,64}()
interfaces then you should use io{read,write}{8,16,32,64}_rep()
instead of memcpy_{to,from}io().

Sure.

Note, I could be wrong.  Please test.

I think the operation of the two things might be different.

Yes, they are different things, the iowrite*_rep() functions write
each value from a buffer all to the same single address, rather than
copy a buffer into another buffer, and the ioread*_rep() functions
repeatedly read from the same address to fill a buffer.

For example, the iowrite32_rep() boils down to this:
        do {
            __raw_writel(*buf++, addr);
        } while (--count);

Not quite what I need.

That's what I suspected.