From: Vitaly Kuzmichev <vitaly_kuzmic...@mentor.com> Here is alternate version to implement default DMA coherent pool, that we use in our custom kernel since 2015.
Unlike to Vladimir Murzin's patch [1] "drivers: dma-coherent: Introduce default DMA pool" this variant stores pointer to "rmem->priv" pointer and thus it does not need additional function (dma_init_reserved_memory) to explicitly call device_init (=rmem_dma_device_init) to get valid address in "rmem->priv". Default DMA pool attribute for memory region is being provided from a device tree file. Patch 2/2 adds 'dmainfo' to ProcFS to show available DMA regions. The patchset is based on driver-core-next branch. [1] https://patchwork.kernel.org/patch/9615465/ George G. Davis (2): drivers: dma-coherent: Add support for default DMA coherent pool drivers: dma-coherent: show per-device DMA region utilization via procfs .../bindings/reserved-memory/reserved-memory.txt | 2 + drivers/base/dma-coherent.c | 250 +++++++++++++++++++-- 2 files changed, 237 insertions(+), 15 deletions(-) -- 1.9.1
