Catalin Marinas 3be9b84689 arm64: support DMA zone above 4GB ... Commit 791ab8b2e3 ("arm64: Ignore any DMA offsets in the max_zone_phys() calculation") made arm64 DMA/DMA32 zones span the entire RAM when RAM starts above 32-bits. This breaks hardware with DMA area that start above 32-bits. But the commit log says that "we haven't noticed any such hardware". It turns out that such hardware does exist. One such platform has RAM starting at 32GB with an internal bus that has the following DMA limits: #address-cells = <2>; #size-cells = <2>; dma-ranges = <0x00 0xc0000000 0x08 0x00000000 0x00 0x40000000>; That is, devices under this bus see 1GB of DMA range between 3GB-4GB in their address space. This range is mapped to CPU memory at 32GB-33GB. With current code DMA allocations for devices under this bus are not limited to DMA area, leading to run-time allocation failure. This commit reinstates DMA zone at the bottom of RAM. The result is DMA zone that properly reflects the hardware constraints as follows: [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000800000000-0x000000083fffffff] [ 0.000000] DMA32 empty [ 0.000000] Normal [mem 0x0000000840000000-0x0000000bffffffff] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> [baruch: split off the original patch] Signed-off-by: Baruch Siach <baruch@tkos.co.il> Reviewed-by: Petr Tesarik <ptesarik@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de>		2024-08-22 06:18:11 +02:00
..
alpha	alpha: fix ioread64be()/iowrite64be() helpers	2024-08-01 15:48:03 +02:00
arc
arm	ARM: riscpc: ecard: Fix the build	2024-08-13 11:34:52 +02:00
arm64	arm64: support DMA zone above 4GB	2024-08-22 06:18:11 +02:00
csky
hexagon
loongarch	LoongArch: KVM: Remove undefined a6 argument comment for kvm_hypercall()	2024-08-07 17:37:14 +08:00
m68k	Kbuild updates for v6.11	2024-07-23 14:32:21 -07:00
microblaze
mips	mips: sgi-ip22: Fix the build	2024-08-13 11:34:55 +02:00
nios2	Kbuild updates for v6.11	2024-07-23 14:32:21 -07:00
openrisc
parisc	parisc: fix a possible DMA corruption	2024-07-29 16:19:07 +02:00
powerpc	dma-mapping: replace zone_dma_bits by zone_dma_limit	2024-08-22 06:18:00 +02:00
riscv	Merge patch series "RISC-V: hwprobe: Misaligned scalar perf fix and rename"	2024-08-15 13:12:21 -07:00
s390	dma-mapping: replace zone_dma_bits by zone_dma_limit	2024-08-22 06:18:00 +02:00
sh	sh updates for v6.11	2024-07-23 11:57:52 -07:00
sparc	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
um	minmax: make generic MIN() and MAX() macros available everywhere	2024-07-28 15:49:18 -07:00
x86	KVM: x86: Disallow read-only memslots for SEV-ES and SEV-SNP (and TDX)	2024-08-14 12:28:24 -04:00
xtensa
.gitignore
Kconfig