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1b2354dbcc
The PL330 is hard-wired such that instruction fetches on both the manager and channel threads go out onto the bus with the "privileged" bit set. This can become troublesome once there is an IOMMU or other form of memory protection downstream, since those will typically be programmed by the DMA mapping subsystem in the expectation of normal unprivileged transactions (such as the PL330 channel threads' own data accesses as currently configured by this driver). To avoid the case of, say, an IOMMU blocking an unexpected privileged transaction with a permission fault, use the newly-introduced DMA_ATTR_PRIVILEGED attribute for the mapping of our microcode buffer. That way the DMA layer can do whatever it needs to do to make things continue to work as expected on more complex systems. Cc: Dan Williams <dan.j.williams@intel.com> Cc: Vinod Koul <vinod.koul@intel.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org> [rm: remove now-redundant local variable, clarify commit message] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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| .. | ||
| bestcomm | ||
| dw | ||
| hsu | ||
| ioat | ||
| ipu | ||
| ppc4xx | ||
| qcom | ||
| sh | ||
| xilinx | ||
| acpi-dma.c | ||
| amba-pl08x.c | ||
| at_hdmac_regs.h | ||
| at_hdmac.c | ||
| at_xdmac.c | ||
| bcm2835-dma.c | ||
| coh901318_lli.c | ||
| coh901318.c | ||
| coh901318.h | ||
| cppi41.c | ||
| dma-axi-dmac.c | ||
| dma-jz4740.c | ||
| dma-jz4780.c | ||
| dmaengine.c | ||
| dmaengine.h | ||
| dmatest.c | ||
| edma.c | ||
| ep93xx_dma.c | ||
| fsl_raid.c | ||
| fsl_raid.h | ||
| fsl-edma.c | ||
| fsldma.c | ||
| fsldma.h | ||
| idma64.c | ||
| idma64.h | ||
| img-mdc-dma.c | ||
| imx-dma.c | ||
| imx-sdma.c | ||
| iop-adma.c | ||
| k3dma.c | ||
| Kconfig | ||
| lpc18xx-dmamux.c | ||
| Makefile | ||
| mic_x100_dma.c | ||
| mic_x100_dma.h | ||
| mmp_pdma.c | ||
| mmp_tdma.c | ||
| moxart-dma.c | ||
| mpc512x_dma.c | ||
| mv_xor_v2.c | ||
| mv_xor.c | ||
| mv_xor.h | ||
| mxs-dma.c | ||
| nbpfaxi.c | ||
| of-dma.c | ||
| omap-dma.c | ||
| pch_dma.c | ||
| pl330.c | ||
| pxa_dma.c | ||
| s3c24xx-dma.c | ||
| sa11x0-dma.c | ||
| sirf-dma.c | ||
| st_fdma.c | ||
| st_fdma.h | ||
| ste_dma40_ll.c | ||
| ste_dma40_ll.h | ||
| ste_dma40.c | ||
| stm32-dma.c | ||
| sun4i-dma.c | ||
| sun6i-dma.c | ||
| tegra20-apb-dma.c | ||
| tegra210-adma.c | ||
| ti-dma-crossbar.c | ||
| timb_dma.c | ||
| TODO | ||
| txx9dmac.c | ||
| txx9dmac.h | ||
| virt-dma.c | ||
| virt-dma.h | ||
| xgene-dma.c | ||
| zx296702_dma.c | ||