Compute the minimal required hole during scan and only evict those nodes
that overlap. This enables us to reduce the number of nodes we need to
evict to the bare minimum.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-31-chris@chris-wilson.co.uk

The scan state occupies a large proportion of the struct drm_mm and is
rarely used and only contains temporary state. That makes it suitable to
moving to its struct and onto the stack of the callers.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
[danvet: Fix up etnaviv to compile, was missing a BUG_ON.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

To make sure we don't place anything there which might confuse
the FE prefetcher. This gets rid of another case of FE MMU faults
when the address space gets crowded before triggering the reaper.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

At least on the GC3000 the FE MMU is not properly flushing stale TLB
entries. Make sure to map the cmdbufs with a big enough spacing in
the IOVAs to not hit old/prefetched TLB entries when jumping to a
newly mapped cmdbuf.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

All other parts are now in place, so implement the actual translation
step and hook it up, so the driver claims support for cores with
the new MMU.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

With MMUv2 all buffers need to be mapped through the MMU once it
is enabled. Align the buffer size to 4K, as the MMU is only able to
map page aligned buffers.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

With MMUv2 the command buffers need to be mapped through the MMU.
Split out the iova search and MMU reaping logic so it can be reused
for the cmdbuf mapping, where no GEM object is involved.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

The GPU virtual address for the command buffers differs depending on
the IOMMU version. Move the calculation of the iova into etnaviv
mmu, to enable proper dispatch.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

The GPU code doesn't need to deal with the IOMMU directly, instead
it can all be hidden behind the etnaviv mmu interface. Move the
last remaining part into etnaviv mmu.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

So we can call the v2 restore code once it is there.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

As the comment above the code states, the linear window is only
available on MMUv1. Don't try to use it on MMUv2.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

Currently, we scan the list of mappings each time we want to operate on
the vram_mapping struct.  Rather than repeatedly scanning these, look
them up once in the submission path, and then use _reference and
_unreference methods as necessary to manage this object.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>

This adds the etnaviv DRM driver and hooks it up in Makefiles
and Kconfig.
Signed-off-by: NChristian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>