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ASoC: SOF: Intel: hda: Add support for persistent Code Loader DMA buf…
…fers It has been reported that the DMA memory allocation for firmware download can fail after extended period of uptime on systems with relatively small amount of RAM when the system memory becomes fragmented. The issue primarily happens when the system is waking up from system suspend, swap might not be available and the MM system cannot move things around to allow for successful allocation. If the IMR boot is not supported then for each DSP boot we would need to allocate the DMA buffer for firmware transfer, which can increase the chances of the issue to be hit. This patch adds support for allocating the DMA buffers once at first boot time and keep it until the system is shut down, rebooted or the drivers re-loaded and makes this as the default operation. With persistent_cl_buffer module parameter the persistent Code Loader DMA buffer can be disabled to fall back to on demand allocation. Signed-off-by: Peter Ujfalusi <[email protected]>
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