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Allocate 32MB with dma_alloc_coherent in ARM64

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I am trying to pass image buffers from an ARM64 device to Xilinx FPGA device using PCIe DMA. I want to allocate 32MB coherent DMA buffer with dma_alloc_coherent. But not able to get it in one try. Now I get it as a multiple of 4MB. Is there a way to get 32MB in one shot using dma_alloc_coherent?

I want to get it in one shot since the memory has to be mapped to user space using dma_mmap_coherent, where I can only pass start of vma. Directly using remap_pfn_range may not be a viable option since the IOMMU is enabled.

arm pci mmap

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asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

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I am trying to pass image buffers from an ARM64 device to Xilinx FPGA device using PCIe DMA. I want to allocate 32MB coherent DMA buffer with dma_alloc_coherent. But not able to get it in one try. Now I get it as a multiple of 4MB. Is there a way to get 32MB in one shot using dma_alloc_coherent?

I want to get it in one shot since the memory has to be mapped to user space using dma_mmap_coherent, where I can only pass start of vma. Directly using remap_pfn_range may not be a viable option since the IOMMU is enabled.

arm pci mmap

share

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

add a comment
 | 

I am trying to pass image buffers from an ARM64 device to Xilinx FPGA device using PCIe DMA. I want to allocate 32MB coherent DMA buffer with dma_alloc_coherent. But not able to get it in one try. Now I get it as a multiple of 4MB. Is there a way to get 32MB in one shot using dma_alloc_coherent?

I want to get it in one shot since the memory has to be mapped to user space using dma_mmap_coherent, where I can only pass start of vma. Directly using remap_pfn_range may not be a viable option since the IOMMU is enabled.

arm pci mmap

share

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

share

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

share

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges

asked 4 mins ago

Gilson VargheseGilson Varghese

6077 bronze badges