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/*
* Copyright © 2016 Intel Corporation
*
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
*/
#ifndef __I915_UTILS_H
#define __I915_UTILS_H
#include <linux/overflow.h>
#include <linux/sched.h>
#include <linux/string_helpers.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/sched/clock.h>
#ifdef CONFIG_X86
#include <asm/hypervisor.h>
#endif
struct drm_i915_private;
#define MISSING_CASE(x) WARN(1, "Missing case (%s == %ld)\n", \
__stringify(x), (long)(x))
#define i915_probe_error(i915, fmt, ...) ({ \
drm_err(&(i915)->drm, fmt, ##__VA_ARGS__); \
})
#define fetch_and_zero(ptr) ({ \
typeof(*ptr) __T = *(ptr); \
*(ptr) = (typeof(*ptr))0; \
__T; \
})
/*
* check_user_mbz: Check that a user value exists and is zero
*
* Frequently in our uABI we reserve space for future extensions, and
* two ensure that userspace is prepared we enforce that space must
* be zero. (Then any future extension can safely assume a default value
* of 0.)
*
* check_user_mbz() combines checking that the user pointer is accessible
* and that the contained value is zero.
*
* Returns: -EFAULT if not accessible, -EINVAL if !zero, or 0 on success.
*/
#define check_user_mbz(U) ({ \
typeof(*(U)) mbz__; \
get_user(mbz__, (U)) ? -EFAULT : mbz__ ? -EINVAL : 0; \
})
#define __mask_next_bit(mask) ({ \
int __idx = ffs(mask) - 1; \
mask &= ~BIT(__idx); \
__idx; \
})
static inline bool is_power_of_2_u64(u64 n)
{
return (n != 0 && ((n & (n - 1)) == 0));
}
void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint);
static inline void __add_taint_for_CI(unsigned int taint)
{
/*
* The system is "ok", just about surviving for the user, but
* CI results are now unreliable as the HW is very suspect.
* CI checks the taint state after every test and will reboot
* the machine if the kernel is tainted.
*/
add_taint(taint, LOCKDEP_STILL_OK);
}
static inline bool i915_run_as_guest(void)
{
#if IS_ENABLED(CONFIG_X86)
return !hypervisor_is_type(X86_HYPER_NATIVE);
#else
/* Not supported yet */
return false;
#endif
}
bool i915_vtd_active(struct drm_i915_private *i915);
bool i915_direct_stolen_access(struct drm_i915_private *i915);
#endif /* !__I915_UTILS_H */
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