Messages in this thread | | | Date | Mon, 19 Dec 2016 08:31:44 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH v2 0/3] swiotlb: Add swiotlb=noforce debug option |
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On Fri, Dec 16, 2016 at 02:28:39PM +0100, Geert Uytterhoeven wrote: > Hi Konrad,
Heya! > > 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.
Let me run it on various combinations of x86 and if all is good will ask Linus to pick it up for rc1.
Thanks! > > 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@linux-m68k.org > > 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
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