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https://e2e.ti.com/support/processors/f/791/t/628671?AM5728-DMA-memory-allocation-fails-with-dmabuf
Using the repacker module in VIP, i am able to rearrange the input data in UYVY format. So that I can remove the VPE plugin from the pipeline and I can use the io-mode=5; since there is no memory allocation problem in io-mode=5.
https://docs.oracle.com/cd/E19620-01/805-3024/dma-18/index.html
Allocating DMA Resources. Two interfaces allocate DMA resources: ddi_dma_buf_bind_handle(9F) - Used with buffer structures. ddi_dma_addr_bind_handle(9F) - Used with virtual addresses. Table 7-2 lists the appropriate DMA resource allocation interfaces for different classes of DMA objects.. Table 7-2 DMA Resource Allocation Interfaces
https://www.programiz.com/c-programming/c-dynamic-memory-allocation
C Dynamic Memory Allocation. In this tutorial, you'll learn to dynamically allocate memory in your C program using standard library functions: malloc(), calloc(), free() and realloc(). As you know, an array is a collection of a fixed number of values. Once the size of an array is declared, you cannot change it.
https://elinux.org/images/2/23/LinuxCMA-cewg43.pdf
Linux Contiguous Memory Allocator (and a little IOMMU) ... Static Allocation Allocate memory at boot time Simple to do (eg. via memblock) waste of memory when device is not in use ... CMA and IOMMU allow for dynamically allocating DMA memory Support added in v3.5, v3.6
https://www.oreilly.com/library/view/linux-device-drivers/0596005903/ch15.html
Chapter 15. Memory Mapping and DMA This chapter delves into the area of Linux memory management, with an emphasis on techniques that are useful to the device driver writer. Many … - Selection from Linux Device Drivers, 3rd Edition [Book]
https://community.oracle.com/thread/2432589
I am facing a problem during DMA memory allocation: I need to allocate blocks of 9000 byte contiguous DMA memory for my receive buffer. I am using ddi_dma_alloc to allocate memory. I need contiguos memory hence sgllen is set to 1. If the system is up an running and I add the driver, the driver gets all the required number of DMA blocks.
https://www.javatpoint.com/dynamic-memory-allocation-in-c
Dynamic memory allocation in C. The concept of dynamic memory allocation in c language enables the C programmer to allocate memory at runtime.Dynamic memory allocation in c language is possible by 4 functions of stdlib.h header file. malloc()
https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/allocating-system-space-memory
Allocating System-Space Memory. 06/16/2017; 2 minutes to read; In this article. Drivers can use system-allocated space within their device extensions as global storage areas for device-specific information. Drivers can use only the kernel stack to pass small amounts of data to their internal routines.
https://stackoverflow.com/questions/35556593/how-to-work-with-reserved-cma-memory
Apr 11, 2019 · I would like to allocate piece of physically contiguous reserved memory (in predefined physical addresses) for my device with DMA support. As I see CMA has three options: 1. To reserve memory …
https://en.wikipedia.org/wiki/Direct_memory_access
DMA can also be used for "memory to memory" copying or moving of data within memory. DMA can offload expensive memory operations, such as large copies or scatter-gather operations, from the CPU to a dedicated DMA engine.
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