Why would it fail to init? If CMA allocation fails, the kernel will
fulfill the request using alloc_pages_node():
struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
[...]
/* CMA can be used only in the context which permits sleeping */
if (gfpflags_allow_blocking(gfp)) {
page = dma_alloc_from_contiguous(dev, count, page_order,
gfp & __GFP_NOWARN);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_release_from_contiguous(dev, page, count);
page = NULL;
}
}
if (!page)
page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
[...]
}
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https://bugs.launchpad.net/bugs/1823753
Title:
arm64: cma_alloc errors at boot
Status in linux package in Ubuntu:
Confirmed
Bug description:
On some arm64 systems[*] we are seeing a spew of messages on the
console:
[ 19.534097] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534109] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534113] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534126] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534130] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534142] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534146] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534157] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534161] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534173] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534177] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
This appears to be non-fatal - impacted systems all eventually boot.
But, at least in the case of the HP m400, it slows down boot enough
that MAAS' default timeout will expire before completing deployment.
[*] Observed on a HiSilicon D06 w/ SMMU disabled in the BIOS, as well
as an HP m400 (APM X-Gene) cartridge - although, not on another one
that - in theory - should be identical.
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