CMA Allocation Fault on Petalinux 2020.2 (Zynq-7000)
I want to use 1920x1080 (or more) on my custom Zynq-7000 Board. Mode 1024x768 works nice.
There is CMA allocation error, when I try to use FullHD. I added some output to source code (output below is for 2560x1600, it is the same for 1920x1080, excepting buffer size):
[12:09:34:466] xlnx-pl-disp amba_pl:xlnx_pl_disp: surface width(2560), height(1600) and bpp(24)
[12:09:34:474] xlnx-pl-disp amba_pl:xlnx_pl_disp: bytes per line after alignment: 12288000
[12:09:34:480] xlnx-pl-disp amba_pl:xlnx_pl_disp: allocating 12288000 bytes with kzalloc()...
[12:09:34:488] xlnx-pl-disp amba_pl:xlnx_pl_disp: OK
[12:09:34:491] xlnx-pl-disp amba_pl:xlnx_pl_disp: init gem object...
[12:09:34:497] xlnx-pl-disp amba_pl:xlnx_pl_disp: OK
[12:09:34:500] xlnx-pl-disp amba_pl:xlnx_pl_disp: creating mmap offset...
[12:09:34:505] xlnx-pl-disp amba_pl:xlnx_pl_disp: OK
[12:09:34:508] xlnx-pl-disp amba_pl:xlnx_pl_disp: gem cma created with size 12288000
[12:09:34:514] xlnx-pl-disp amba_pl:xlnx_pl_disp: failed to allocate buffer with size 12288000
[12:09:34:522] xlnx-pl-disp amba_pl:xlnx_pl_disp: Failed to create cma gem object (12288000 bytes)
[12:09:34:527] xlnx-pl-disp amba_pl:xlnx_pl_disp: drm_fb_helper_single_fb_probe() returns -12
[12:09:34:536] xlnx-pl-disp amba_pl:xlnx_pl_disp: Failed to set initial hw configuration.
[12:09:34:541] xlnx-pl-disp amba_pl:xlnx_pl_disp: failed to initialize drm fb
As I see, the issue goes from this line (drm_gem_cma_helper.c)
cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr,GFP_KERNEL | __GFP_NOWARN);
I try to change some settings:
- increase CMA Size in Kernel config (it was 128, now 256 Mb)
- increase CMA Areas number in Kernel config (from 7 to 20)
- add reserved memory to Device Tree
- add coherent_pool option to bootargs
I get the same fault anyway.
Please help to find the reason and solve my issue.
Many thanks!
With regards, Maksim
Solution
The only solution I've found is to change kernel base address from 0x18000000 to 0x11000000 (as shown on screenshot).
Unfortunately, I don't have complete explanation on how it helps.
With regards, Maksim
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