On 02/25/2015 07:20 PM, Bjorn Helgaas wrote:
[+cc Catalin]
On Wed, Feb 11, 2015 at 12:53:35PM -0500, Murali Karicheri wrote:
This patch update of_dma_configure() API to calculate the
masks (dma_mask and coherent_dma_mask) based on the dma-range
values set in DT for the device. Also limit the mask to lower
of the default mask and mask calculated.
Cc: Joerg Roedel<joro@xxxxxxxxxx>
Cc: Grant Likely<grant.likely@xxxxxxxxxx>
Cc: Rob Herring<robh+dt@xxxxxxxxxx>
Cc: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
Cc: Will Deacon<will.deacon@xxxxxxx>
Cc: Russell King<linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann<arnd@xxxxxxxx>
Cc: Suravee Suthikulpanit<Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Murali Karicheri<m-karicheri2@xxxxxx>
Applied with Catalin's reviewed-by to pci/iommu for v4.1, thanks!
I agree with Catalin's comment about the "size = 1ULL<< 32" line.
I don't see how that will make a difference, so I dropped it. The
patch I merged is below. Let me know if you think we do need that
line or any other tweaks.
Bjorn
commit a5a1dd69080dfcf53bfd6e179f3db68e824aeaae
Author: Murali Karicheri<m-karicheri2@xxxxxx>
Date: Wed Feb 25 17:21:04 2015 -0600
of: Calculate device DMA masks based on DT dma-range size
Calculate the dma_mask and coherent_dma_mask based on the dma-range values
set in DT for the device.
Limit the mask to lower of the default mask and mask calculated.
Signed-off-by: Murali Karicheri<m-karicheri2@xxxxxx>
Signed-off-by: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
Reviewed-by: Catalin Marinas<catalin.marinas@xxxxxxx>
CC: Joerg Roedel<joro@xxxxxxxxxx>
CC: Grant Likely<grant.likely@xxxxxxxxxx>
CC: Rob Herring<robh+dt@xxxxxxxxxx>
CC: Will Deacon<will.deacon@xxxxxxx>
CC: Russell King<linux@xxxxxxxxxxxxxxxx>
CC: Arnd Bergmann<arnd@xxxxxxxx>
CC: Suravee Suthikulpanit<Suravee.Suthikulpanit@xxxxxxx>
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 28e743888402..20c1332a0018 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -90,10 +90,11 @@ void of_dma_configure(struct device *dev, struct device_node *np)
struct iommu_ops *iommu;
/*
- * Set default dma-mask to 32 bit. Drivers are expected to setup
- * the correct supported dma_mask.
+ * Set default coherent_dma_mask to 32 bit. Drivers are expected to
+ * setup the correct supported mask.
*/
- dev->coherent_dma_mask = DMA_BIT_MASK(32);
+ if (!dev->coherent_dma_mask)
+ dev->coherent_dma_mask = DMA_BIT_MASK(32);
/*
* Set it to coherent_dma_mask by default if the architecture
@@ -128,6 +129,15 @@ void of_dma_configure(struct device *dev, struct device_node *np)
dev->dma_pfn_offset = offset;
+ /*
+ * Limit coherent and dma mask based on size and default mask
+ * set by the driver.
+ */
+ dev->coherent_dma_mask = min(dev->coherent_dma_mask,
+ DMA_BIT_MASK(ilog2(dma_addr + size)));
+ *dev->dma_mask = min((*dev->dma_mask),
+ DMA_BIT_MASK(ilog2(dma_addr + size)));
+
coherent = of_dma_is_coherent(np);
dev_dbg(dev, "device is%sdma coherent\n",
coherent ? " " : " not ");
Bjorn,
Thanks. Looks good to me.
Murali
--
Murali Karicheri
Linux Kernel, Texas Instruments
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