[PATCH] dma-pool: use single atomic pool for both DMA zones
Nicolas Saenz Julienne
nsaenzjulienne at suse.de
Wed Jul 8 06:35:34 EDT 2020
On Tue, 2020-07-07 at 17:08 -0500, Jeremy Linton wrote:
> I spun this up on my 8G model using the PFTF firmware from:
> Which allows me to switch between ACPI/DT on the machine. In DT mode it
> works fine now,
Nice, would that count as a Tested-by from you?
> but with ACPI I continue to have failures unless I
> disable CMA via cma=0 on the kernel command line.
Yes, I see why, in atomic_pool_expand() memory is allocated from CMA without
checking its correctness. That calls for a separate fix. I'll try to think of
> It think that is because
> using DT:
> [ 0.000000] Reserved memory: created CMA memory pool at
> 0x0000000037400000, size 64 MiB
> using ACPI:
> [ 0.000000] cma: Reserved 64 MiB at 0x00000000f8000000
> Which is AFAIK because the default arm64 CMA allocation is just below
> the arm64_dma32_phys_limit.
As I'm sure you know, we fix the CMA address trough DT, isn't that possible
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