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Instead of throttling and execbuffer time, have the application ask to
throttle explicitly. This allows the throttle to happen less often, and
without holding the DRM lock.
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struct_mutex cannot be held while blocking on DRM lock.
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Without kernel modesetting, this requires cooperation of the userspace
modesetting driver. We may have to leave the vblank interrupt enabled otherwise
to avoid problems.
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Only compensate when the driver counter actually appears to have moved
backwards.
The compensation deltas need to be incremental instead of absolute; drop the
vblank_offset field and just use atomic_sub().
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Turns out the radeon driver is affected by the same problem that prompted i915
to revert to less useful counter flipping at the end of the vblank interval. In
the long term, we can hopefully implement more reliable methods to achieve
counter flipping at the beginning of vblank, but otherwise this should be an
acceptable workaround.
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This reverts commit 6671ad1917698b6174a1af314b63b3800d75248c.
The vblank ioctl needs to update the userspace parameters when interrupted by
a signal, which was prevented by this. Let's see if this breaks other ioctls...
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This should be pci_map_page not pci_map_single
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Just renaming this function and related parameters to match terminology used
elsewhere in the driver.
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set_domain can block waiting for rendering to complete. If that process is
interrupted by a signal, it can return -EINTR. Catch this error in all
callers and correctly deal with the result.
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Conflicts:
linux-core/Makefile.kernel
shared-core/i915_drv.h
shared-core/nouveau_state.c
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The problem was revealed where on 965, the display list vertex buffer would see:
create -> (CPU, CPU)
set_domain (CPU, CPU) -> (CPU, CPU)
set_comain (CPU, 0) -> (CPU, 0) (no clflush occurred)
execbuf (GPU, 0) -> (CPU+GPU, 0) (still no clflush)
instead of:
create -> (CPU, CPU)
set_domain (CPU, CPU) -> (CPU, CPU)
set_comain (CPU, 0) -> (CPU, CPU)
execbuf (GPU, 0) -> (CPU+GPU, 0) (clflushed)
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Otherwise, 965 constant state buffers get re-relocated every exec. Ouch.
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Object domain transfer can involve adding flush ops to the request queue,
and so the DRM lock must be held to avoid having the X server smash pointers
badly.
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The interrupt enable register cannot be used to temporarily disable
interrupts, instead use the interrupt mask register.
Note that this change means that a pile of buffers will be left stuck on the
chip as the final interrupts will not be recognized to come and drain things.
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This new ioctl returns whether re-using the buffer would force a wait.
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i915_gem_flush_pwrite optimizes short writes to the buffer by clflushing
only the modified pages, but it was miscomputing the number of pages.
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When reading from multiple domains, allow each cache to continue
to hold data until writes occur somewhere. This is done by
first leaving the read_domains alone at bind time (presumably the CPU read
cache contains valid data still) and then in set_domain, if no write_domain
is specified, the new read domains are simply merged into the existing read
domains.
A huge comment was added above set_domain to explain how things are
expected to work.
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Newly allocated objects need to be in the CPU domain as they've just been
cleared by the CPU. Also, unmapping objects from the GTT needs to put them
into the CPU domain, both to flush rendering as well as to ensure that any
paging action gets flushed before we remap to the GTT.
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Commands in the ring are parsed and started when the head pointer passes by
them, but they are not necessarily finished until a MI_FLUSH happens. This
patch inserts a flush after the execbuffer (the only place a flush wasn't
already happening).
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Ring locals must be reloaded from hardware in case the X server ran.
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There are now 3 lists. Active is buffers currently in the ringbuffer.
Flushing is not in the ringbuffer, but needs a flush before unbinding.
Inactive is as before. This prevents object_free → unbind →
wait_rendering → object_reference and a kernel oops about weird refcounting.
This also avoids an synchronous extra flush and wait when freeing a buffer
which had a write_domain set (such as a temporary rendered to and then from
using the 2d engine). It will sit around on the flushing list until the
appropriate flush gets emitted, or we need the GTT space for another
operation.
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Since it's a circular list, the entry won't be NULL at termination.
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Otherwise, in the middle of the function called using it the last ref
might disappear.
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Ring locals must be reloaded from hardware in case the X server ran.
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This lets us get some qualities we desire, such as using the full 32-bit
range (except zero), avoiding DRM_WAIT_ON, and a 1:1 mapping of active
sequence numbers to request structs, which will be used soon for throttling
and interrupt-driven list cleanup.
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Additionally, a boolean active field is added to indicate which list an
object is on, rather than smashing last_rendering_cookie to 0 to show
inactive. This will help with flush-reduction later on, and makes the code
clearer.
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This reverts commit bc0836e12a9790f1cc83f8bc29bc05043c4bc840.
tree has some kref hacks in it - oops
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Thanks to Alex for supplying this info.
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No need to fill the ring that much; wait for it to become nearly empty
before adding the execbuffer request. A better fix will involve scheduling
ring insertion in the irq handler.
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Leave the flush call in place, which can fix domains up if necessary.
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pread and pwrite must update the memory domains to ensure consistency with
the GPU. At some point, it should be possible to avoid clflush through this
path, but that isn't working for me.
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The exec list contains all objects, in order of use. The lru list contains
only unpinned objects ready to be evicted. This required two changes -- the
first was to not migrate pinned objects from exec to lru, the second was to
search for the first unpinned object in the exec list when doing eviction.
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