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Date:   Mon, 27 Aug 2018 08:46:41 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 4.19-rc1
Message-ID: <20180827154641.GA17201@infradead.org>
References: <CA+55aFw9mxNPX6OtOp-aoUMdXSg=gBkQudGGamo__sh_ts_LdQ@mail.gmail.com>
 <20180827134459.GA16094@roeck-us.net>
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> sparc:
> 
> WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 esp_sbus_probe+0x408/0x6e8
> WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 sparc_lance_probe_one+0x428/0x4f
> 
> Missing initialization of coherent_dma_mask in the respective drivers.
> 
> ---
> Each platform driver instantiated through a devicetree node now generates
> the following warning:
> 
> esp ffd38e00: DMA mask not set
> 
> It isn't a traceback so it may fly under the radar. There is nothing the
> drivers can do about it; the message is generated by the core before the
> driver probe function is called. No idea what a correct fix might be.

Both of these should probably be fixed by something like the patch
below:

---
From 6294e0e330851ee06e66ab85b348f1d92d375d7a Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 27 Aug 2018 17:23:24 +0200
Subject: driver core: initialize a default DMA mask for platform device

We still treat devices without a DMA mask as defaulting to 32-bits for
both mask, but a few releases ago we've started warning about such
cases, as they require special cases to work around this sloppyness.
Add a dma_mask field to struct platform_object so that we can initialize
the dma_mask pointer in struct device and initialize both masks to
32-bits by default.  Architectures can still override this in
arch_setup_pdev_archdata if needed.

Note that the code looks a little odd with the various conditionals
because we have to support platform_device structures that are
statically allocated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/platform.c         | 15 +++++++++++++--
 include/linux/platform_device.h |  1 +
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index dff82a3c2caa..baf4b06cf2d9 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -225,6 +225,17 @@ struct platform_object {
 	char name[];
 };
 
+static void setup_pdev_archdata(struct platform_device *pdev)
+{
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	if (!pdev->dma_mask)
+		pdev->dma_mask = DMA_BIT_MASK(32);
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &pdev->dma_mask;
+	arch_setup_pdev_archdata(pdev);
+};
+
 /**
  * platform_device_put - destroy a platform device
  * @pdev: platform device to free
@@ -271,7 +282,7 @@ struct platform_device *platform_device_alloc(const char *name, int id)
 		pa->pdev.id = id;
 		device_initialize(&pa->pdev.dev);
 		pa->pdev.dev.release = platform_device_release;
-		arch_setup_pdev_archdata(&pa->pdev);
+		setup_pdev_archdata(&pa->pdev);
 	}
 
 	return pa ? &pa->pdev : NULL;
@@ -472,7 +483,7 @@ EXPORT_SYMBOL_GPL(platform_device_del);
 int platform_device_register(struct platform_device *pdev)
 {
 	device_initialize(&pdev->dev);
-	arch_setup_pdev_archdata(pdev);
+	setup_pdev_archdata(pdev);
 	return platform_device_add(pdev);
 }
 EXPORT_SYMBOL_GPL(platform_device_register);
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 1a9f38f27f65..d84ec1de6022 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -25,6 +25,7 @@ struct platform_device {
 	int		id;
 	bool		id_auto;
 	struct device	dev;
+	dma_addr_t	dma_mask;
 	u32		num_resources;
 	struct resource	*resource;
 
-- 
2.18.0