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23 October 2021, 00:29:24 UTC
Revision f45b55575cedb7efa782e43f1ea74338456d0381 authored by Eugeni Dodonov on 10 December 2011, 01:16:37 UTC, committed by Keith Packard on 16 December 2011, 16:49:59 UTC 
drm/i915: enable semaphores on per-device defaults
 
This adds a default setting for semaphores parameter, and enables
semaphores by default on IVB.

For now, as semaphores interaction with VTd causes random issues on
SNB, we do not enable them by default. But they can still be enabled
via the semaphores=1 kernel parameter.

v2: enables semaphores on SNB when IO remapping is disabled, with base
on Keith Packard patch.

CC: Daniel Vetter <daniel.vetter@ffwll.ch>
CC: Ben Widawsky <ben@bwidawsk.net>
CC: Keith Packard <keithp@keithp.com>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42696
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=40564
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41353
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38862
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
1 parent 7317c75
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Tip revision: f45b55575cedb7efa782e43f1ea74338456d0381 authored by Eugeni Dodonov on 10 December 2011, 01:16:37 UTC
drm/i915: enable semaphores on per-device defaults
Tip revision: f45b555
sched_cpupri.h 
#ifndef _LINUX_CPUPRI_H
#define _LINUX_CPUPRI_H

#include <linux/sched.h>

#define CPUPRI_NR_PRIORITIES	(MAX_RT_PRIO + 2)

#define CPUPRI_INVALID -1
#define CPUPRI_IDLE     0
#define CPUPRI_NORMAL   1
/* values 2-101 are RT priorities 0-99 */

struct cpupri_vec {
	atomic_t	count;
	cpumask_var_t	mask;
};

struct cpupri {
	struct cpupri_vec pri_to_cpu[CPUPRI_NR_PRIORITIES];
	int               cpu_to_pri[NR_CPUS];
};

#ifdef CONFIG_SMP
int  cpupri_find(struct cpupri *cp,
		 struct task_struct *p, struct cpumask *lowest_mask);
void cpupri_set(struct cpupri *cp, int cpu, int pri);
int cpupri_init(struct cpupri *cp);
void cpupri_cleanup(struct cpupri *cp);
#else
#define cpupri_set(cp, cpu, pri) do { } while (0)
#define cpupri_init() do { } while (0)
#endif

#endif /* _LINUX_CPUPRI_H */
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