Hi Konrad,
This patch series adds a kernel command line option to aid debugging
when developing support for DMA to memory outside the 32-bit address
space. If specified, trying to map memory that cannot be used with DMA
will fail, and a warning will be printed. This has been used
succesfully to find drivers and DMA engines that do not support 64-bit
memory.
Changes compared to v1:
- Dropp patch "swiotlb: Rate-limit printing when running out of
SW-IOMMU space", which has been picked up,
- Add cleanup patch 1/3,
- Add patch 2/3, to convert the flag swiotlb_force from an int to an
enum,
- Change the kernel parameter "swiotlb=nobounce" to "swiotlb=noforce"
(requested by Konrad Wilk),
- Extend swiotlb_force enum instead of adding an swiotlb_nobounce
variable (requested by Konrad Wilk).
This has been tested on ra7796/salvator-x, and compile-tested on x86.
Thanks!
Geert Uytterhoeven (3):
x86, swiotlb: Simplify pci_swiotlb_detect_override()
swiotlb: Convert swiotlb_force from int to enum
swiotlb: Add swiotlb=noforce debug option
Documentation/admin-guide/kernel-parameters.txt | 3 ++-
arch/arm64/mm/dma-mapping.c | 3 ++-
arch/arm64/mm/init.c | 3 ++-
arch/x86/kernel/pci-swiotlb.c | 6 ++----
arch/x86/xen/pci-swiotlb-xen.c | 2 +-
drivers/xen/swiotlb-xen.c | 4 ++--
include/linux/swiotlb.h | 8 +++++++-
include/trace/events/swiotlb.h | 17 +++++++++-------
lib/swiotlb.c | 26 +++++++++++++++++++------
9 files changed, 48 insertions(+), 24 deletions(-)
--
1.9.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
