Searching for Device Tree Support For Cma Contiguous Memory Allocator information? Find all needed info by using official links provided below.
https://github.com/bperez77/xilinx_axidma/issues/4
To allocate large regions of physically-contiguous memory, the driver uses the CMA (contiguous memory allocator). At boot time, the user specifies the cma=<size>M parameter to reserve a region of size megabytes for the CMA.. It would be much nicer if the user could instead specify this in the device tree, as this requires less manual user intervention, since they don't …
https://forums.xilinx.com/xlnx/attachments/xlnx/ELINUX/10658/1/drivers-session4-dma-4public.pdf
Memory Allocation For DMA – Part 2 The dma_alloc_coherent() function allocates non-cached physically contiguous memory –The name coherent can be a confusing name (for me anyway) –The CPU and the I/O device see the same memory contents without any cache operations –Accesses to the memory by the CPU are the same as a cache miss when the cache is used
https://lwn.net/Articles/396657/
Jul 20, 2010 · Here is an excerpt from the documentation which describes what it is and why is it needed: The Contiguous Memory Allocator (CMA) is a framework, which allows setting up a machine-specific configuration for physically-contiguous memory management. Memory for devices is then allocated according to that configuration.
https://stackoverflow.com/questions/28755023/linux-kernel-cma-device-tree
Feb 27, 2015 · Linux kernel: CMA & Device Tree. Ask Question 1. 2. I've tried to use the CMA (Contiguous Memory Allocator) configured with DT. But how can I access the allocated memory region form the module? This is the DT part:
https://elinux.org/images/2/23/LinuxCMA-cewg43.pdf
Linux Contiguous Memory Allocator (and a little IOMMU) ... Contiguous Memory Allocator CMA support introduced in Linux kernel v3.5-rc1 ... Backported to LTSI kernel v3.4 Global and per-device CMA pools –Good for devices with very large memory requirements Access via …
http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/linuxutils/latest/docs/html/group__ti___c_m_e_m.html
Describes the interface to the contiguous memory allocator. ... or with the new DT (Device Tree) method. The DT method is the prefered method due to its control by a system integrator. ... On systems with CMA (Contiguous Memory Allocator) support, CMEM can be used to allocate CMA buffers. Both heap and pool allocations are supported.
https://github.com/shichaog/zynq-dma/tree/master/xilinx_axidma
Aug 28, 2017 · Allocation of DMA buffers that are contiguous in physical memory, allowing for high-bandwidth DMA transfers, through the kernel's contiguous memory allocator (CMA). Allocation of memory that is coherent between the FPGA and processor, by disabling caching for those pages in the DMA buffer. Synchronous and asynchronous modes for transfers.
https://stackoverflow.com/q/28755023
Linux kernel: CMA & Device Tree. Ask Question Asked 4 years, 11 months ago. Active 4 years, 11 months ago. Viewed 1k times 1. 2. I've tried to use the CMA (Contiguous Memory Allocator) configured with DT. But how can I access the allocated memory …
https://e2e.ti.com/support/processors/f/791/t/749931?Linux-DRA71-DDR-allocation-in-Linux-device-tree
Below is what I allocate DDR in device tree file: 1. No. The reserved node implies, kernel can't allocate from the given region of DDR and the no-map attribute implies the region isn't mapped in kernel. 2. Cmem is a contiguous memory allocator which is used to allocate physically contiguous buffers ...
https://lwn.net/Articles/486301/
Mar 14, 2012 · The Contiguous Memory Allocator (or CMA), which LWN looked at back in June 2011, has been developed to allow allocation of big, physically-contiguous memory blocks. Simple in principle, it has grown quite complicated, requiring cooperation between many subsystems. Depending on one's perspective, there are different things to be done and watch out for with CMA.
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