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455fa6518a
This update brings few features:
o Support for the setmaster/dropmaster ioctls. For instance, they
are used to run multiple X servers simultaneously.
o Support for minor devices. The only user-visible change is a new
entry in /dev/dri but it is useless at the moment. This is a
first step to support render nodes [1].
The main benefit is to greatly reduce the diff with Linux (at the
expense of an unreadable commit diff). Hopefully, next upgrades will be
easier.
No updates were made to the drivers, beside adapting them to API
changes.
[1] https://en.wikipedia.org/wiki/Direct_Rendering_Manager#Render_nodes
Tested by: Many people
MFC after: 1 month
Relnotes: yes
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/**
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* \file drm_atomic.h
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* Atomic operations used in the DRM which may or may not be provided by the OS.
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*
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* \author Eric Anholt <anholt@FreeBSD.org>
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*/
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/*-
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* Copyright 2004 Eric Anholt
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* Copyright 2013 Jung-uk Kim <jkim@FreeBSD.org>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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typedef u_int atomic_t;
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typedef uint64_t atomic64_t;
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#define NB_BITS_PER_LONG (sizeof(long) * NBBY)
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#define BITS_TO_LONGS(x) howmany(x, NB_BITS_PER_LONG)
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#define atomic_read(p) (*(volatile u_int *)(p))
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#define atomic_set(p, v) do { *(u_int *)(p) = (v); } while (0)
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#define atomic64_read(p) atomic_load_acq_64(p)
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#define atomic64_set(p, v) atomic_store_rel_64(p, v)
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#define atomic_add(v, p) atomic_add_int(p, v)
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#define atomic_sub(v, p) atomic_subtract_int(p, v)
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#define atomic_inc(p) atomic_add(1, p)
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#define atomic_dec(p) atomic_sub(1, p)
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#define atomic_add_return(v, p) (atomic_fetchadd_int(p, v) + (v))
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#define atomic_sub_return(v, p) (atomic_fetchadd_int(p, -(v)) - (v))
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#define atomic_inc_return(p) atomic_add_return(1, p)
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#define atomic_dec_return(p) atomic_sub_return(1, p)
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#define atomic_add_and_test(v, p) (atomic_add_return(v, p) == 0)
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#define atomic_sub_and_test(v, p) (atomic_sub_return(v, p) == 0)
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#define atomic_inc_and_test(p) (atomic_inc_return(p) == 0)
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#define atomic_dec_and_test(p) (atomic_dec_return(p) == 0)
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#define atomic_xchg(p, v) atomic_swap_int(p, v)
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#define atomic64_xchg(p, v) atomic_swap_64(p, v)
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#define __bit_word(b) ((b) / NB_BITS_PER_LONG)
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#define __bit_mask(b) (1UL << (b) % NB_BITS_PER_LONG)
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#define __bit_addr(p, b) ((volatile u_long *)(p) + __bit_word(b))
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#define clear_bit(b, p) \
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atomic_clear_long(__bit_addr(p, b), __bit_mask(b))
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#define set_bit(b, p) \
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atomic_set_long(__bit_addr(p, b), __bit_mask(b))
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#define test_bit(b, p) \
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((*__bit_addr(p, b) & __bit_mask(b)) != 0)
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#define test_and_set_bit(b, p) \
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(atomic_xchg((p), 1) != b)
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#define cmpxchg(ptr, old, new) \
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(atomic_cmpset_int((volatile u_int *)(ptr),(old),(new)) ? (old) : (0))
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static __inline u_long
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find_first_zero_bit(const u_long *p, u_long max)
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{
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u_long i, n;
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KASSERT(max % NB_BITS_PER_LONG == 0, ("invalid bitmap size %lu", max));
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for (i = 0; i < max / NB_BITS_PER_LONG; i++) {
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n = ~p[i];
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if (n != 0)
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return (i * NB_BITS_PER_LONG + ffsl(n) - 1);
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}
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return (max);
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}
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