linux-stable.git/include/linux/swiotlb.h, branch v5.13.2

swiotlb: remove swiotlb_nr_tbl

2021-03-19T04:58:25+00:00

All callers just use it to check if swiotlb is active at all, for which
they can just use is_swiotlb_active.  In the longer run drivers need
to stop using is_swiotlb_active as well, but let's do the simple step
first.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: dynamically allocate io_tlb_default_mem

2021-03-19T04:58:25+00:00

Instead of allocating ->list and ->orig_addr separately just do one
dynamic allocation for the actual io_tlb_mem structure.  This simplifies
a lot of the initialization code, and also allows to just check
io_tlb_default_mem to see if swiotlb is in use.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: move global variables into a new io_tlb_mem structure

2021-03-19T04:58:25+00:00

Added a new struct, io_tlb_mem, as the IO TLB memory pool descriptor and
moved relevant global variables into that struct.
This will be useful later to allow for restricted DMA pool.

Signed-off-by: Claire Chang 
[hch: rebased]
Signed-off-by: Christoph Hellwig 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: split swiotlb_tbl_sync_single

2021-03-17T00:32:01+00:00

Split swiotlb_tbl_sync_single into two separate funtions for the to device
and to cpu synchronization.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: remove the alloc_size parameter to swiotlb_tbl_unmap_single

2021-03-17T00:21:53+00:00

Now that swiotlb remembers the allocation size there is no need to pass
it back to swiotlb_tbl_unmap_single.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: add a IO_TLB_SIZE define

2021-02-20T15:13:32+00:00

Add a new IO_TLB_SIZE define instead open coding it using
IO_TLB_SHIFT all over.

Signed-off-by: Christoph Hellwig 
Acked-by: Jianxiong Gao 
Tested-by: Jianxiong Gao 
Signed-off-by: Konrad Rzeszutek Wilk

x86,swiotlb: Adjust SWIOTLB bounce buffer size for SEV guests

2020-12-11T20:43:41+00:00

For SEV, all DMA to and from guest has to use shared (un-encrypted) pages.
SEV uses SWIOTLB to make this happen without requiring changes to device
drivers.  However, depending on the workload being run, the default 64MB
of it might not be enough and it may run out of buffers to use for DMA,
resulting in I/O errors and/or performance degradation for high
I/O workloads.

Adjust the default size of SWIOTLB for SEV guests using a
percentage of the total memory available to guest for the SWIOTLB buffers.

Adds a new sev_setup_arch() function which is invoked from setup_arch()
and it calls into a new swiotlb generic code function swiotlb_adjust_size()
to do the SWIOTLB buffer adjustment.

v5 fixed build errors and warnings as
Reported-by: kbuild test robot 

Signed-off-by: Ashish Kalra 
Co-developed-by: Borislav Petkov 
Signed-off-by: Borislav Petkov 
Signed-off-by: Konrad Rzeszutek Wilk

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2020-11-16T22:58:23+00:00

Pull vhost fixes from Michael Tsirkin:
 "Fixes all over the place, most notably vhost scsi IO error fixes"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost scsi: Add support for LUN resets.
  vhost scsi: add lun parser helper
  vhost scsi: fix cmd completion race
  vhost scsi: alloc cmds per vq instead of session
  vhost: add helper to check if a vq has been setup
  vdpasim: fix "mac_pton" undefined error
  swiotlb: using SIZE_MAX needs limits.h included

swiotlb: remove the tbl_dma_addr argument to swiotlb_tbl_map_single

2020-11-02T15:10:39+00:00

The tbl_dma_addr argument is used to check the DMA boundary for the
allocations, and thus needs to be a dma_addr_t.  swiotlb-xen instead
passed a physical address, which could lead to incorrect results for
strange offsets.  Fix this by removing the parameter entirely and hard
code the DMA address for io_tlb_start instead.

Fixes: 91ffe4ad534a ("swiotlb-xen: introduce phys_to_dma/dma_to_phys translations")
Signed-off-by: Christoph Hellwig 
Reviewed-by: Stefano Stabellini 
Signed-off-by: Konrad Rzeszutek Wilk

swiotlb: using SIZE_MAX needs limits.h included

2020-11-02T11:05:05+00:00

After merging the drm-misc tree, linux-next build (arm
multi_v7_defconfig) failed like this:

In file included from drivers/gpu/drm/nouveau/nouveau_ttm.c:26:
include/linux/swiotlb.h: In function 'swiotlb_max_mapping_size':
include/linux/swiotlb.h:99:9: error: 'SIZE_MAX' undeclared (first use in this function)
   99 |  return SIZE_MAX;
      |         ^~~~~~~~
include/linux/swiotlb.h:7:1: note: 'SIZE_MAX' is defined in header ''; did you forget to '#include '?
    6 | #include 
  +++ |+#include 
    7 | #include 
include/linux/swiotlb.h:99:9: note: each undeclared identifier is reported only once for each function it appears in
   99 |  return SIZE_MAX;
      |         ^~~~~~~~

Caused by commit

  abe420bfae52 ("swiotlb: Introduce swiotlb_max_mapping_size()")

but only exposed by commit "drm/nouveu: fix swiotlb include"

Fix it by including linux/limits.h as appropriate.

Fixes: abe420bfae52 ("swiotlb: Introduce swiotlb_max_mapping_size()")
Signed-off-by: Stephen Rothwell 
Link: https://lore.kernel.org/r/20201102124327.2f82b2a7@canb.auug.org.au
Signed-off-by: Michael S. Tsirkin