linux/arch
Linus Torvalds 234172f6bb add swiotlb support to arm
This fixes a cascade of regressions that originally started with
 the addition of the ia64 port, but only got fatal once we removed
 most uses of block layer bounce buffering in Linux 4.18.
 
 The reason is that while the original i386/PAE code that was the first
 architecture that supported > 4GB of memory without an iommu decided to
 leave bounce buffering to the subsystems, which in those days just mean
 block and networking as no one else consumer arbitrary userspace memory.
 
 Later with ia64, x86_64 and other ports we assumed that either an iommu
 or something that fakes it up ("software IOTLB" in beautiful Intel
 speak) is present and that subsystems can rely on that for dealing with
 addressing limitations in devices.   Except that the ARM LPAE scheme
 that added larger physical address to 32-bit ARM did not follow that
 scheme and thus only worked by chance and only for block and networking
 I/O directly to highmem.
 
 Long story, short fix - add swiotlb support to arm when build for LPAE
 platforms, which actuallys turns out to be pretty trivial with the
 modern dma-direct / swiotlb code to fix the Linux 4.18-ish regression.
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Merge tag 'arm-swiotlb-5.3' of git://git.infradead.org/users/hch/dma-mapping

Pull arm swiotlb support from Christoph Hellwig:
 "This fixes a cascade of regressions that originally started with the
  addition of the ia64 port, but only got fatal once we removed most
  uses of block layer bounce buffering in Linux 4.18.

  The reason is that while the original i386/PAE code that was the first
  architecture that supported > 4GB of memory without an iommu decided
  to leave bounce buffering to the subsystems, which in those days just
  mean block and networking as no one else consumed arbitrary userspace
  memory.

  Later with ia64, x86_64 and other ports we assumed that either an
  iommu or something that fakes it up ("software IOTLB" in beautiful
  Intel speak) is present and that subsystems can rely on that for
  dealing with addressing limitations in devices. Except that the ARM
  LPAE scheme that added larger physical address to 32-bit ARM did not
  follow that scheme and thus only worked by chance and only for block
  and networking I/O directly to highmem.

  Long story, short fix - add swiotlb support to arm when build for LPAE
  platforms, which actuallys turns out to be pretty trivial with the
  modern dma-direct / swiotlb code to fix the Linux 4.18-ish regression"

* tag 'arm-swiotlb-5.3' of git://git.infradead.org/users/hch/dma-mapping:
  arm: use swiotlb for bounce buffering on LPAE configs
  dma-mapping: check pfn validity in dma_common_{mmap,get_sgtable}
2019-08-02 08:44:33 -07:00
..
alpha Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
arc Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
arm add swiotlb support to arm 2019-08-02 08:44:33 -07:00
arm64 SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
c6x Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2019-07-10 21:42:03 -07:00
csky treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
h8300 h8300 update for 5.3 2019-07-17 09:36:38 -07:00
hexagon hexagon: switch to generic version of pte allocation 2019-07-21 09:53:00 -07:00
ia64 Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
m68k arch: mark syscall number 435 reserved for clone3 2019-07-15 00:39:33 +02:00
microblaze clone3-v5.3 2019-07-11 10:09:44 -07:00
mips This round of clk driver and framework updates is heavy on the driver update 2019-07-17 10:07:48 -07:00
nds32 treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
nios2 nios2 update for v5.3-rc1 2019-07-12 15:38:05 -07:00
openrisc dma-mapping updates for Linux 5.3 2019-07-12 15:13:55 -07:00
parisc parisc: Flush ITLB in flush_tlb_all_local() only on split TLB machines 2019-07-21 11:03:02 +02:00
powerpc SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
riscv SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
s390 SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
sh treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
sparc treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
um This pull request contains the following changes for UML: 2019-07-14 17:17:34 -07:00
unicore32 Kconfig updates for v5.3 2019-07-12 16:06:27 -07:00
x86 SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
xtensa Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
.gitignore
Kconfig Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-20 10:33:44 -07:00