search for: swiotlb_map

...[#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-syzkaller #0 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > RIP: 0010:swiotlb_map+0x5ac/0x700 kernel/dma/swiotlb.c:683 > Code: 28 04 00 00 48 c1 ea 03 80 3c 02 00 0f 85 4d 01 00 00 4c 8b a5 18 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 1e 01 00 00 48 8d 7d 50 4d 8b 24 24 48 b8 00 00 > RSP: 0000:ffffc9000034f3e0 EFLAGS: 00010246 &g...

...ian 8.2.0-14) 8.2.0 reproduce: git checkout 951a381d4c0d45a9b44de30228c6ef17083854ea # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): vim +/swiotlb_max_mapping_size +99 include/linux/swiotlb.h 75 76 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, 77 size_t size, enum dma_data_direction dir, unsigned long attrs); 78 void __init swiotlb_exit(void); 79 unsigned int swiotlb_max_segment(void); 80 #else 81 #define swiotlb_force SWIOTLB_NO_FORCE 82 static inline...

...s_swiotlb_active(void) ^~~~~~~~~~~~~~~~~ include/linux/swiotlb.h:66:6: note: previous declaration of 'is_swiotlb_active' was here bool is_swiotlb_active(void); ^~~~~~~~~~~~~~~~~ vim +/is_swiotlb_active +105 include/linux/swiotlb.h 76 77 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, 78 size_t size, enum dma_data_direction dir, unsigned long attrs); 79 void __init swiotlb_exit(void); 80 unsigned int swiotlb_max_segment(void); 81 #else 82 #define swiotlb_force SWIOTLB_NO_FORCE 83 static inline...

...-- include/linux/swiotlb.h | 6 ++++++ kernel/dma/swiotlb.c | 9 +++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index d3980aeed4a0..29bc3a203283 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -77,6 +77,7 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, void __init swiotlb_exit(void); unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); +bool is_swiotlb_active(void); #else #define swiotlb_force SWIOTLB_NO_FORCE static inline bool is_swiotlb_b...

Hi, here is the next version of this patch-set. Previous versions can be found here: V1: https://lore.kernel.org/lkml/20190110134433.15672-1-joro at 8bytes.org/ V2: https://lore.kernel.org/lkml/20190115132257.6426-1-joro at 8bytes.org/ V3: https://lore.kernel.org/lkml/20190123163049.24863-1-joro at 8bytes.org/ V4: https://lore.kernel.org/lkml/20190129084342.26030-1-joro at 8bytes.org/

Hi all, this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs with a separate new dma_alloc_pages API, which is available on all platforms. In addition to cleaning up the convoluted code path, this ensures that other drivers that have asked for better support for non-coherent DMA to pages with incurring bounce buffering over can finally be properly supported. I'm still a