linux-toradex.git/include/linux/iommu-helper.h, branch v3.2.73

iommu: inline iommu_num_pages

2010-08-10T03:45:05+00:00

A profile of a network benchmark showed iommu_num_pages rather high up:

     0.52%  iommu_num_pages

Looking at the profile, an integer divide is taking almost all of the time:

      %
         :      c000000000376ea4 <.iommu_num_pages>:
    1.93 :      c000000000376ea4:       fb e1 ff f8     std     r31,-8(r1)
    0.00 :      c000000000376ea8:       f8 21 ff c1     stdu    r1,-64(r1)
    0.00 :      c000000000376eac:       7c 3f 0b 78     mr      r31,r1
    3.86 :      c000000000376eb0:       38 84 ff ff     addi    r4,r4,-1
    0.00 :      c000000000376eb4:       38 05 ff ff     addi    r0,r5,-1
    0.00 :      c000000000376eb8:       7c 84 2a 14     add     r4,r4,r5
   46.95 :      c000000000376ebc:       7c 00 18 38     and     r0,r0,r3
   45.66 :      c000000000376ec0:       7c 84 02 14     add     r4,r4,r0
    0.00 :      c000000000376ec4:       7c 64 2b 92     divdu   r3,r4,r5
    0.00 :      c000000000376ec8:       38 3f 00 40     addi    r1,r31,64
    0.00 :      c000000000376ecc:       eb e1 ff f8     ld      r31,-8(r1)
    1.61 :      c000000000376ed0:       4e 80 00 20     blr

Since every caller of iommu_num_pages passes in a constant power of two
we can inline this such that the divide is replaced by a shift. The
entire function is only a few instructions once optimised, so it is
a good candidate for inlining overall.

Signed-off-by: Anton Blanchard 
Cc: Akinobu Mita 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

iommu-helper: use bitmap library

2009-12-16T15:20:18+00:00

Use bitmap library and kill some unused iommu helper functions.

1. s/iommu_area_free/bitmap_clear/

2. s/iommu_area_reserve/bitmap_set/

3. Use bitmap_find_next_zero_area instead of find_next_zero_area

  This cannot be simple substitution because find_next_zero_area
  doesn't check the last bit of the limit in bitmap

4. Remove iommu_area_free, iommu_area_reserve, and find_next_zero_area

Signed-off-by: Akinobu Mita 
Cc: "David S. Miller" 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: FUJITA Tomonori 
Cc: Joerg Roedel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

introduce generic iommu_num_pages function

2008-10-16T18:21:33+00:00

This patch introduces the generic iommu_num_pages function. It can be used by
a given memory area.

Signed-off-by: Joerg Roedel 
Cc: "David S. Miller" 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: FUJITA Tomonori 
Cc: Muli Ben-Yehuda 
Cc: Dave Airlie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

AMD IOMMU: use iommu_device_max_index, fix

2008-10-06T14:51:30+00:00

include/linux/iommu-helper.h has no header guards, which breaks
sparc64 build. Add them.

Signed-off-by: Thomas Gleixner 
Cc: Joerg Roedel 
Cc: FUJITA Tomonori 
Signed-off-by: Ingo Molnar

iommu: export iommu_area_reserve helper function

2008-09-22T14:47:50+00:00

x86 has set_bit_string() that does the exact same thing that
set_bit_area() in lib/iommu-helper.c does.

This patch exports set_bit_area() in lib/iommu-helper.c as
iommu_area_reserve(), converts GART, Calgary, and AMD IOMMU to use it.

Signed-off-by: FUJITA Tomonori 
Acked-by: Joerg Roedel 
Signed-off-by: Ingo Molnar

iommu: add iommu_device_max_index IOMMU helper function

2008-09-14T14:42:36+00:00

This function helps IOMMUs to know the highest address that a device
can access to.

Signed-off-by: FUJITA Tomonori 
Signed-off-by: Ingo Molnar

generic, x86: fix add iommu_num_pages helper function

2008-07-29T10:12:48+00:00

This IOMMU helper function doesn't work for some architectures:

  http://marc.info/?l=linux-kernel&m=121699304403202&w=2

It also breaks POWER and SPARC builds:

  http://marc.info/?l=linux-kernel&m=121730388001890&w=2

Currently, only x86 IOMMUs use this so let's move it to x86 for
now.

Reported-by: Stephen Rothwell 
Signed-off-by: FUJITA Tomonori 
Signed-off-by: Ingo Molnar

iommu: add iommu_num_pages helper function

2008-07-26T13:43:05+00:00

Calculating the number of pages from given address and length numbers is a task
required in multiple IOMMU implementations. So implement this as a generic
function into the IOMMU helper code.

Signed-off-by: Joerg Roedel 
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: robert.richter@amd.com
Cc: FUJITA Tomonori 
Signed-off-by: Ingo Molnar

iommu: export iommu_is_span_boundary helper function

2008-03-05T00:35:17+00:00

iommu_is_span_boundary is used internally in the IOMMU helper
(lib/iommu-helper.c), a primitive function that judges whether a memory area
spans LLD's segment boundary or not.

It's difficult to convert some IOMMUs to use the IOMMU helper but
iommu_is_span_boundary is still useful for them.  So this patch exports it.

This is needed for the parisc iommu fixes.

Signed-off-by: FUJITA Tomonori 
Cc: Kyle McMartin 
Cc: Matthew Wilcox 
Cc: Grant Grundler 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

iommu sg: add IOMMU helper functions for the free area management

2008-02-05T17:44:11+00:00

This adds IOMMU helper functions for the free area management.  These
functions take care of LLD's segment boundary limit for IOMMUs.  They would be
useful for IOMMUs that use bitmap for the free area management.

Signed-off-by: FUJITA Tomonori 
Cc: Jeff Garzik 
Cc: James Bottomley 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds