Re: [PATCH RFC v1 4/7] swiotlb: to implement io_tlb_high_mem

otice it is the default 'io_tlb_default_mem', but will not be able to know if it is allocated from 32-bit or 64-bit buffer. Thank you very much for the feedback. Dongli Zhang

[PATCH RFC v1 0/7] swiotlb: extra 64-bit buffer for dev->dma_io_tlb_mem

/kernel/debug/swiotlb/swiotlb-hi/io_tlb_nslabs 3145728 $ cat /sys/kernel/debug/swiotlb/swiotlb-hi/io_tlb_used 8960 Dongli Zhang (7): swiotlb: introduce the highmem swiotlb buffer swiotlb: change the signature of remap function swiotlb-xen: support highmem for xen specific code swiotlb: to imp

[PATCH RFC v1 3/7] swiotlb-xen: support highmem for xen specific code

Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- drivers/xen/swiotlb-xen.c | 14 +++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 339f46e21053..d15321e9f9db 100644 --- a/drivers/xen/swiotlb-xen.c +++ b

[PATCH RFC v1 1/7] swiotlb: introduce the highmem swiotlb buffer

mmand line "swiotlb=32768,3145728,force" is to allocate 64MB for default swiotlb, and 6GB for the extra highmem swiotlb. Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- include/linux/swiotlb.h | 2 ++ kernel/dma/swiotlb.c| 16 2 files changed,

[PATCH RFC v1 7/7] swiotlb: fix the slot_addr() overflow

n a value smaller than the expected one. As a result, the swiotlb_bounce() will access a wrong swiotlb slot. Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- kernel/dma/swiotlb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/dma/swiotlb.c b/

[PATCH RFC v1 2/7] swiotlb: change the signature of remap function

Add new argument 'high' to remap function, so that it will be able to remap the swiotlb buffer based on whether the swiotlb is 32-bit or 64-bit. Currently the only remap function is xen_swiotlb_fixup(). Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- arch/x86/inclu

[PATCH RFC v1 6/7] virtio: use io_tlb_high_mem if it is active

When the swiotlb is enforced (e.g., when amd sev is involved), the virito driver will not be able to use 4+ GB memory. Therefore, the virtio driver uses 'io_tlb_high_mem' as swiotlb. Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- drivers/virtio/virtio.c | 8 ++

[PATCH RFC v1 4/7] swiotlb: to implement io_tlb_high_mem

em.nslabs) returns true. Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- arch/powerpc/kernel/dma-swiotlb.c | 8 ++- arch/x86/kernel/pci-dma.c | 5 +- include/linux/swiotlb.h | 2 +- kernel/dma/swiotlb.c | 103 +- 4 file

[PATCH RFC v1 5/7] swiotlb: add interface to set dev->dma_io_tlb_mem

The interface re-configures dev->dma_io_tlb_mem conditionally, if the 'io_tlb_high_mem' is active. Cc: Konrad Wilk Cc: Joe Jin Signed-off-by: Dongli Zhang --- include/linux/swiotlb.h | 6 ++ kernel/dma/swiotlb.c| 10 ++ 2 files changed, 16 insertions(+) diff --

Re: [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer

; > nslabs = SLABS_PER_PAGE << order; > bytes = nslabs << IO_TLB_SHIFT; > @@ -323,6 +343,16 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask) > (PAGE_SIZE << order) >> 20); > nslabs = SLABS_PER_PAGE <<

Re: [PATCH 10/12] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction

ted DMA patchset is going to supports 64-bit (or high memory) DMA. Is this what you are looking for? Dongli Zhang > > Michael > > [1] > https://urldefense.com/v3/__https://lore.kernel.org/lkml/20220209122302.213882-1-ltyker...@gmail.com/__;!!ACWV5N9M2RV99hQ!fUx4fMgdQIrqJDDy-pbv

[PATCH RFC v1 6/6] xen-swiotlb: enable 64-bit xen-swiotlb

This patch is to enable the 64-bit xen-swiotlb buffer. For Xen PVM DMA address, the 64-bit device will be able to allocate from 64-bit swiotlb buffer. Cc: Joe Jin Signed-off-by: Dongli Zhang --- drivers/xen/swiotlb-xen.c | 117 -- 1 file changed, 74

[PATCH RFC v1 5/6] xen-swiotlb: convert variables to arrays

enable 64-bit xen-swiotlb. Cc: Joe Jin Signed-off-by: Dongli Zhang --- drivers/xen/swiotlb-xen.c | 75 +-- 1 file changed, 40 insertions(+), 35 deletions(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 662638093542..e18cae693cdc 100644

[PATCH RFC v1 2/6] swiotlb: convert variables to arrays

- no_iotlb_memory There is no functional change and this is to prepare to enable 64-bit swiotlb. Cc: Joe Jin Signed-off-by: Dongli Zhang --- arch/powerpc/platforms/pseries/svm.c | 6 +- drivers/xen/swiotlb-xen.c| 4 +- include/linux/swiotlb.h | 5 +- kernel/dma/swiotlb.c

[PATCH RFC v1 4/6] swiotlb: enable 64-bit swiotlb

el will be able to allocate >4GB swiotlb buffer. This patch is only for swiotlb, not including xen-swiotlb. Cc: Joe Jin Signed-off-by: Dongli Zhang --- arch/mips/cavium-octeon/dma-octeon.c | 3 +- arch/powerpc/kernel/dma-swiotlb.c| 2 +- arch/powerpc/platforms/pseries/svm.

[PATCH RFC v1 1/6] swiotlb: define new enumerated type

This is just to define new enumerated type without functional change. The 'SWIOTLB_LO' is to index legacy 32-bit swiotlb buffer, while the 'SWIOTLB_HI' is to index the 64-bit buffer. This is to prepare to enable 64-bit swiotlb. Cc: Joe Jin Signed-off-by: Dongli Zhang

[PATCH RFC v1 3/6] swiotlb: introduce swiotlb_get_type() to calculate swiotlb buffer type

This patch introduces swiotlb_get_type() in order to calculate which swiotlb buffer the given DMA address is belong to. This is to prepare to enable 64-bit swiotlb. Cc: Joe Jin Signed-off-by: Dongli Zhang --- include/linux/swiotlb.h | 14 ++ kernel/dma/swiotlb.c| 2 ++ 2

[PATCH RFC v1 0/6] swiotlb: 64-bit DMA buffer

vm# cat /sys/kernel/debug/swiotlb/io_tlb_nslabs 65536 vm# cat /sys/kernel/debug/swiotlb/io_tlb_used 0 vm# cat /sys/kernel/debug/swiotlb/io_tlb_nslabs-highmem 1048576 vm# cat /sys/kernel/debug/swiotlb/io_tlb_used-highmem 64647 Please let me know if there is any feedback for this idea and RFC. Don