/* drm_fops.h -- File operations for DRM -*- linux-c -*- * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Rickard E. (Rik) Faith * Daryll Strauss * Gareth Hughes * */ #include "drmP.h" drm_file_t *DRM(find_file_by_proc)(drm_device_t *dev, DRM_STRUCTPROC *p) { #if __FreeBSD_version >= 500021 uid_t uid = p->td_ucred->cr_svuid; pid_t pid = p->td_proc->p_pid; #else uid_t uid = p->p_cred->p_svuid; pid_t pid = p->p_pid; #endif drm_file_t *priv; DRM_SPINLOCK_ASSERT(&dev->dev_lock); TAILQ_FOREACH(priv, &dev->files, link) if (priv->pid == pid && priv->uid == uid) return priv; return NULL; } /* DRM(open_helper) is called whenever a process opens /dev/drm. */ int DRM(open_helper)(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p, drm_device_t *dev) { int m = minor(kdev); drm_file_t *priv; if (flags & O_EXCL) return EBUSY; /* No exclusive opens */ dev->flags = flags; DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m); DRM_LOCK(); priv = DRM(find_file_by_proc)(dev, p); if (priv) { priv->refs++; } else { priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES); if (priv == NULL) { DRM_UNLOCK(); return DRM_ERR(ENOMEM); } bzero(priv, sizeof(*priv)); #if __FreeBSD_version >= 500000 priv->uid = p->td_ucred->cr_svuid; priv->pid = p->td_proc->p_pid; #else priv->uid = p->p_cred->p_svuid; priv->pid = p->p_pid; #endif priv->refs = 1; priv->minor = m; priv->devXX = dev; priv->ioctl_count = 0; priv->authenticated = !DRM_SUSER(p); DRIVER_OPEN_HELPER( priv, dev ); TAILQ_INSERT_TAIL(&dev->files, priv, link); } DRM_UNLOCK(); #ifdef __FreeBSD__ kdev->si_drv1 = dev; #endif return 0; } /* The DRM(read) and DRM(poll) are stubs to prevent spurious errors * on older X Servers (4.3.0 and earlier) */ int DRM(read)(struct cdev *kdev, struct uio *uio, int ioflag) { return 0; } int DRM(poll)(struct cdev *kdev, int events, DRM_STRUCTPROC *p) { return 0; } 12'>12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

/**
 * \file drm_atomic.h
 * Atomic operations used in the DRM which may or may not be provided by the OS.
 * 
 * \author Eric Anholt <anholt@FreeBSD.org>
 */

/*-
 * Copyright 2004 Eric Anholt
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/* Many of these implementations are rather fake, but good enough. */

typedef u_int32_t atomic_t;

#define atomic_set(p, v)	(*(p) = (v))
#define atomic_read(p)		(*(p))
#define atomic_inc(p)		atomic_add_int(p, 1)
#define atomic_dec(p)		atomic_subtract_int(p, 1)
#define atomic_add(n, p)	atomic_add_int(p, n)
#define atomic_sub(n, p)	atomic_subtract_int(p, n)

static __inline atomic_t
test_and_set_bit(int b, volatile void *p)
{
	int s = splhigh();
	unsigned int m = 1<<b;
	unsigned int r = *(volatile int *)p & m;
	*(volatile int *)p |= m;
	splx(s);
	return r;
}

static __inline void
clear_bit(int b, volatile void *p)
{
	atomic_clear_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
}

static __inline void
set_bit(int b, volatile void *p)
{
	atomic_set_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
}

static __inline int
test_bit(int b, volatile void *p)
{
	return ((volatile int *)p)[b >> 5] & (1 << (b & 0x1f));
}

static __inline int
find_first_zero_bit(volatile void *p, int max)
{
	int b;
	volatile int *ptr = (volatile int *)p;

	for (b = 0; b < max; b += 32) {
		if (ptr[b >> 5] != ~0) {
			for (;;) {
				if ((ptr[b >> 5] & (1 << (b & 0x1f))) == 0)
					return b;
				b++;
			}
		}
	}
	return max;
}