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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2019-03-18 16:39:30 +0100
committerVinod Koul <vkoul@kernel.org>2019-03-21 15:18:26 +0100
commit5ba846b1ee0792f5a596b9b0b86d6e8cdebfab06 (patch)
treecd0cdb27ccfa210ee71c0eb3d8bdac7e2d48349d /drivers/dma/idma64.h
parentLinux 5.1-rc1 (diff)
downloadlinux-5ba846b1ee0792f5a596b9b0b86d6e8cdebfab06.tar.xz
linux-5ba846b1ee0792f5a596b9b0b86d6e8cdebfab06.zip
dmaengine: idma64: Use actual device for DMA transfers
Intel IOMMU, when enabled, tries to find the domain of the device, assuming it's a PCI one, during DMA operations, such as mapping or unmapping. Since we are splitting the actual PCI device to couple of children via MFD framework (see drivers/mfd/intel-lpss.c for details), the DMA device appears to be a platform one, and thus not an actual one that performs DMA. In a such situation IOMMU can't find or allocate a proper domain for its operations. As a result, all DMA operations are failed. In order to fix this, supply parent of the platform device to the DMA engine framework and fix filter functions accordingly. We may rely on the fact that parent is a real PCI device, because no other configuration is present in the wild. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> [for tty parts] Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/idma64.h')
-rw-r--r--drivers/dma/idma64.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/idma64.h b/drivers/dma/idma64.h
index 6b816878e5e7..baa32e1425de 100644
--- a/drivers/dma/idma64.h
+++ b/drivers/dma/idma64.h
@@ -216,12 +216,14 @@ static inline void idma64_writel(struct idma64 *idma64, int offset, u32 value)
/**
* struct idma64_chip - representation of iDMA 64-bit controller hardware
* @dev: struct device of the DMA controller
+ * @sysdev: struct device of the physical device that does DMA
* @irq: irq line
* @regs: memory mapped I/O space
* @idma64: struct idma64 that is filed by idma64_probe()
*/
struct idma64_chip {
struct device *dev;
+ struct device *sysdev;
int irq;
void __iomem *regs;
struct idma64 *idma64;