CVS log for src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h

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drm: Teach bus_dma_hacks.h about alpha.

Not sure if this is correct!  Someone who knows alpha should vet.

drm: Fix index confusion and rename variables to clarify.

drm: Let's go one segment at a time, not two, shall we?

drm: Another pass over i915 and some supporting logic.

This makes a shim around sg_table, which essentially represents two
things:

1. an array of pages (roughly corresponding to bus_dma_segment_t[])
2. an array of DMA addresses stored in a bus_dmamap_t

Both parts are optional; different parts of i915 use sg_tables to
pass around one or both of the two parts.  This helps to reduce the
ifdefs by quite a bit, although it's not always clear which part of
an sg_table any particular interface is actually using which is why I
was reluctant to do this before.

drm: Nix use of uvm pglist.  Just use arrays of page pointers.

Mostly merge changes from HEAD upto 20200411

Merge changes from current as of 20200406

Pull up following revision(s) (requested by mrg in ticket #791):

	sys/external/bsd/drm2/include/drm/bus_dma_hacks.h: revision 1.20

in bus_dmamap_load_pglist() try a 32-element array of
bus_dma_segment_t's before attempting to allocate.
this hopefully avoids hangs i've had in X since updating
from netbsd-8 to netbsd-9 that i've tracked down to this
function failing with ENOMEM.

XXX: maybe can avoid the alloc entirely by batching these
calls in 32 segments each.

XXX pullup-9

Sync with head.

in bus_dmamap_load_pglist() try a 32-element array of
bus_dma_segment_t's before attempting to allocate.

this hopefully avoids hangs i've had in X since updating
from netbsd-8 to netbsd-9 that i've tracked down to this
function failing with ENOMEM.

XXX: maybe can avoid the alloc entirely by batching these
calls in 32 segments each.

XXX pullup-9

Sync with head.

Fix PHYS_TO_BUS_MEM and BUS_MEM_TO_PHYS on arm and aarch64

Pull up following revision(s) (requested by jmcneill in ticket #400):

	sys/arch/arm/sunxi/sunxi_drm.c: revision 1.8
	sys/external/bsd/drm2/dist/include/drm/drm_gem_cma_helper.h: revision 1.6
	sys/external/bsd/drm2/dist/include/drm/drmP.h: revision 1.36
	sys/external/bsd/drm2/include/drm/bus_dma_hacks.h: revision 1.18
	sys/external/bsd/drm2/drm/drm_gem_cma_helper.c: revision 1.9
	sys/external/bsd/drm2/include/drm/drm_os_netbsd.h: revision 1.15

Arm DMA tags with _nranges=0 require no address translation. Handle this
in PHYS_TO_BUS_MEM and BUS_TO_PHYS_MEM instead of panicing.

Add support for DRM GEM/CMA helpers using a driver provided vmem arena.

Reserve enough memory at boot to support the drmfb buffer plus a 4K buffer
for Xorg.

Arm DMA tags with _nranges=0 require no address translation. Handle this
in PHYS_TO_BUS_MEM and BUS_TO_PHYS_MEM instead of panicing.

Sync with HEAD

Sync with HEAD

Resolve a couple of conflicts (result of the uimin/uimax changes)

Check for DMA-safe addresses before allowing DRM prime import.

Implement BUS_DMA_TO_PHYS/PHYS_TO_BUS_DMA on arm respecting ranges.

At chuq's suggestion, use paddr_t rather than struct vm_page *.

Doesn't make much of a substantive difference.

sparc seems to treat bus/phys addrs in bus dmamem the same.

This is just about bus dmamem -- not about bus dmamap, which rightly
uses an iommu to remap things and which we don't interfere with.

Eliminate now-unused bus_dmamap_load_pgarray.

Rework drm prime guts.

- Our faux struct sg_table is now just an array of _pages_, not of
  bus dma segments.

- We handle bus dma segments only in the presence of an adult bus dma
  tag.

- All bus dma hacks are once again confined to bus_dma_hacks.h, and
  more neatly organized:
  . bus_dmamem_export_pages translates bus dma segs to vm_page array
  . bus_dmamem_import_pages translates vm_page array to bus dma segs

Use PHYS_TO_BUS_MEM in generic bus_dmamap_load_pglist code.

For arm and x86, this is a noop.  For powerpc, it is defined by some
relevant header file.

Kill bus_dmamem_wire_uvm_object, which never made sense!

Sync with HEAD.  77 conflicts resolved - all of them $NetBSD$

Add initial support for ARMv8 (AARCH64) (by nisimura@ and ryo@)

- sys/arch/evbarm64 is gone and integrated into sys/arch/evbarm. (by skrll@)
- add support fdt. evbarm/conf/GENERIC64 fdt (bcm2837,sunxi,tegra) based generic 64bit kernel config. (by skrll@, jmcneill@)

update from HEAD

Sync with HEAD (as of 26th Dec)

use VM_FREELIST_DEFAULT on arm

Rebase to HEAD as of a few days ago.

Rebase.

file bus_dma_hacks.h was added on branch tls-maxphys on 2014-08-20 00:04:21 +0000

Avoid needless #ifdef __i386__ with judicious use of MIN.

Free temporary segs on the way out of bus_dmamap_load_pglist.

First whack at radeon driver.

No hardware to test yet, but it builds.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

   DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK.  Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

file bus_dma_hacks.h was added on branch yamt-pagecache on 2014-05-22 11:40:55 +0000

file bus_dma_hacks.h was added on branch rmind-smpnet on 2014-05-18 17:46:01 +0000

Miscellaneous fixes for drm2 on i386.

Merge riastradh-drm2 to HEAD.

Implement a bus_dmamem_wire_uvm_object hack.

This is fit only for x86 at the moment -- it parrots the x86
bus_dmamem_alloc code but with uvm_obj_wirepages instead of
uvm_pglistalloc.

XXX THIS IS A MEGA-KLUDGE THAT NEEDS TO BE DONE PROPERLY.

file bus_dma_hacks.h was initially added on branch riastradh-drm2.