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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Aug 20, 2019 at 10:49:30AM +0300, Mike Rapoport wrote: > On Mon, Aug 19, 2019 at 05:56:51PM +0300, Ard Biesheuvel wrote: > > On Mon, 19 Aug 2019 at 11:01, Chester Lin wrote: > > > > > > Hi Mike and Ard, > > > > > > On Thu, Aug 15, 2019 at 04:37:39PM +0300, Mike Rapoport wrote: > > > > On Thu, Aug 15, 2019 at 02:32:50PM +0300, Ard Biesheuvel wrote: > > > > > (adding Mike) > > > > > > > ... > > > > > > > In this case the kernel failed to reserve cma, which should hit the issue of > > > > > > memblock_limit=0x1000 as I had mentioned in my patch description. The first > > > > > > block [0-0xfff] was scanned in adjust_lowmem_bounds(), but it did not align > > > > > > with PMD_SIZE so the cma reservation failed because the memblock.current_limit > > > > > > was extremely low. That's why I expand the first reservation from 1 PAGESIZE to > > > > > > 1 PMD_SIZE in my patch in order to avoid this issue. Please kindly let me know > > > > > > if any suggestion, thank you. > > > > > > > > > > > > > This looks like it is a separate issue. The memblock/cma code should > > > > > not choke on a reserved page of memory at 0x0. > > > > > > > > > > Perhaps Russell or Mike (cc'ed) have an idea how to address this? > > > > > > > > Presuming that the last memblock dump comes from the end of > > > > arm_memblock_init() with the this memory map > > > > > > > > memory[0x0] [0x0000000000000000-0x0000000000000fff], 0x0000000000001000 bytes flags: 0x4 > > > > memory[0x1] [0x0000000000001000-0x0000000007ef5fff], 0x0000000007ef5000 bytes flags: 0x0 > > > > memory[0x2] [0x0000000007ef6000-0x0000000007f09fff], 0x0000000000014000 bytes flags: 0x4 > > > > memory[0x3] [0x0000000007f0a000-0x000000003cb3efff], 0x0000000034c35000 bytes flags: 0x0 > > > > > > > > adjust_lowmem_bounds() will set the memblock_limit (and respectively global > > > > memblock.current_limit) to 0x1000 and any further memblock_alloc*() will > > > > happily fail. > > > > > > > > I believe that the assumption for memblock_limit calculations was that the > > > > first bank has several megs at least. > > > > > > > > I wonder if this hack would help: > > > > > > > > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c > > > > index d9a0038..948e5b9 100644 > > > > --- a/arch/arm/mm/mmu.c > > > > +++ b/arch/arm/mm/mmu.c > > > > @@ -1206,7 +1206,7 @@ void __init adjust_lowmem_bounds(void) > > > > * allocated when mapping the start of bank 0, which > > > > * occurs before any free memory is mapped. > > > > */ > > > > - if (!memblock_limit) { > > > > + if (memblock_limit < PMD_SIZE) { > > > > if (!IS_ALIGNED(block_start, PMD_SIZE)) > > > > memblock_limit = block_start; > > > > else if (!IS_ALIGNED(block_end, PMD_SIZE)) > > > > > > > > > > I applied this patch as well and it works well on rpi-2 model B. > > > > > > > Thanks, Chester, that is good to know. > > > > However, afaict, this only affects systems where physical memory > > starts at address 0x0, so I think we need a better fix. > > This hack can be easily extended to handle systems with arbitrary start > address, but it's still a hack... > > > I know Mike has been looking into the NOMAP stuff lately, and your > > original patch contains a hunk that makes this code (?) disregard > > nomap memblocks. That might be a better approach. > > I was actually looking how to replace NOMAP with something else to make > memblock.memory consistent with actual physical memory banks. But this work > is stashed for now. > > I'm not sure that skipping NOMAP regions would be good enough. > If I understand corrrectly, with Chester's original patch the reservation > of PMD aligned chunk of 32M for the kernel made the first conv-mem region > PMD aligned and then memblock_limit will be set to the end of this region. > > Is there a reason for marking EFI_RESERVED_TYPE as NOMAP rather than simply > reserve them with memblock_reserve()? > Hi Mike, I make this change in efistub so I am not sure if memblock_reserve() can be linked by ld or not. I tried using efi_mem_reserve() but got a linker error of undefined reference. Is there a better place to call memblock_reserve() after efistub? Thanks, Chester _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel