This is the first chunk of the new VMM code that provides the structures
needed to describe a GPU virtual address-space layout, as well as common
interfaces to handle VMM creation, and connecting instances to a VMM.

The constructor now allocates the PD itself, rather than having the user
handle that manually.  This won't/can't be used until after all backends
have been ported to these interfaces, so a little bit of memory will be
wasted on Fermi and newer for a couple of commits in the series.

Compatibility has been hacked into the old code to allow each GPU backend
to be ported individually.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

GP100 "big" (which is a funny name, when it supports "even bigger") page
tables are small enough that we want to be able to suballocate them from
a larger block of memory.

This builds on the previous page table cache interfaces so that the VMM
code doesn't need to know the difference.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Builds up and maintains a small cache of each page table size in order
to reduce the frequency of expensive allocations, particularly in the
pathological case where an address range ping-pongs between allocated
and free.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Removes the need to expose internals outside of MMU, and GP100 is both
different, and a lot harder to deal with.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

This will cause a subtle behaviour change on GPUs that are in mixed-memory
configurations in that VRAM in the degraded section of VRAM will no longer
be used for TTM buffer objects.

That section of VRAM is not meant to be used for displayable/compressed
surfaces, and we have no reliable way with the current interfaces to be
able to make that decision properly.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Another transition step to allow finer-grained patches transitioning to
new MMU backends.

Old backends will continue operate as before (accessing nvkm_mem::tag),
and new backends will get a reference to the tags allocated here.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

This is a transition step, to enable finer-grained commits while
transitioning to new MMU interfaces.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Upcoming MMU changes use nvkm_memory as its basic representation of memory,
so we need to be able to allocate VRAM like this.

The code is basically identical to the current chipset-specific allocators,
minus support for compression tags (which will be handled elsewhere anyway).
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Adds support for 64-bit writes, and optimised filling of buffers with
fixed 32/64-bit values.

These will all be used by the upcoming MMU changes.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

We need to be able to prevent memory from being freed while it's still
mapped in a GPU's address-space.

Will be used by upcoming MMU changes.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Needed by VMM code to determine whether an allocation is compatible with
a given page size (ie. you can't map 4KiB system memory pages into 64KiB
GPU pages).
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Map flags (access, kind, etc) are currently defined in either the VMA,
or the memory object, which turns out to not be ideal for things like
suballocated buffers, etc.

These will become per-map flags instead, so we need to support passing
these arguments in nvkm_memory_map().
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

nvkm_memory is going to be used by the upcoming mmu rework for the basic
representation of a memory allocation, as such, this commit adds support
for comptag allocation to nvkm_memory.

This is very simple for now, in that it requires comptags for the entire
memory allocation even if only certain ranges are compressed.

Support for tracking ranges will be added at a later date.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

A single location for the MM allows us to share allocation logic.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

We probably don't want to destroy compression data when doing multiple
mappings of a memory object.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

We're moving towards having a central place to handle comptag allocation,
and as some GPUs don't have a ram submodule (ie. Tegra), we need to move
the mm somewhere else.

It probably never belonged in ram anyways.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

These will be used in upcoming patches.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Different sections of VRAM may have different properties (ie. can't be used
for compression/display, can't be mapped, etc).

We currently already support this, but it's a bit magic.  This change makes
it more obvious where we're allocating from.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

TTM memory allocations will be hanging off the DRM's client, but the
locking needed to do so gets really tricky with all the other use of
the DRM's object tree.

To solve this, we make the normal DRM client a child of a new master,
where the memory allocations will be done from instead.

This also solves a potential race with client creation.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

The conditional is the same for every mapping.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

We don't really care about where the memory is, just that it's compatible
with a VMA allocated for a given page size.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

It's far more convenient to deal with like this.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>