Hi Greg,
There are two more patches about the ZONE_DMA[32] changes, especially the second one, both them need be backported, thanks.
791ab8b2e3db - arm64: Ignore any DMA offsets in the max_zone_phys() calculation 2687275a5843 - arm64: Force NO_BLOCK_MAPPINGS if crashkernel reservation is required
On 2021/5/11 20:35, Kefeng Wang wrote:
On 2021/3/8 17:58, Greg KH wrote:
On Mon, Mar 08, 2021 at 11:20:03AM +0800, Jing Xiangfeng wrote:
On 2021/3/7 23:24, Greg KH wrote:
On Thu, Mar 04, 2021 at 04:09:28PM +0100, Nicolas Saenz Julienne wrote:
On Thu, 2021-03-04 at 15:17 +0100, Greg KH wrote:
On Thu, Mar 04, 2021 at 03:05:32PM +0100, Nicolas Saenz Julienne wrote: > Hi Greg. > > On Thu, 2021-03-04 at 14:46 +0100, Greg KH wrote: >> On Wed, Mar 03, 2021 at 03:33:12PM +0800, Jing Xiangfeng wrote: >>> Using two distinct DMA zones turned out to be problematic. >>> Here's an >>> attempt go back to a saner default. >> What problem does this solve? How does this fit into the stable >> kernel >> rules? > We changed the way we setup memory zones in arm64 in order to > cater for > Raspberry Pi 4's weird DMA constraints: ZONE_DMA spans the lower > 1GB of memory > and ZONE_DMA32 the rest of the 32bit address space. Since you > can't allocate > memory that crosses zone boundaries, this broke crashkernel > allocations on big > machines. This series fixes all this by parsing the HW > description and checking > for DMA constrained buses. When not found, the unnecessary zone > creation is > skipped. What kernel/commit caused this "breakage"?
1a8e1cef7603 arm64: use both ZONE_DMA and ZONE_DMA32
Thanks for the info, all now queued up.
There is a fix in 5.11. Please consider applying the following commit to 5.10.y:
aed5041ef9a3 of: unittest: Fix build on architectures without CONFIG_OF_ADDRES
Thanks, now queued up.
Hi Grep, another commit d78050ee3544 "arm64: Remove arm64_dma32_phys_limit and its uses" should be involved, thanks.
"Prior to this patch, disabling CONFIG_ZONE_DMA32 leads to CMA allocation from the whole RAM as arm64_dma32_phys_limit becomes PHYS_MASK+1." from Catalin, see more from the link https://www.spinics.net/lists/arm-kernel/msg867356.html
greg k-h .