diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_utils.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_utils.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h new file mode 100644 index 000000000000..4f75115b87d6 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_utils.h @@ -0,0 +1,133 @@ +/* + * 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; + +#ifndef MISSING_CASE +#define MISSING_CASE(x) WARN(1, "Missing case (%s == %ld)\n", \ + __stringify(x), (long)(x)) +#endif + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG) + +int __i915_inject_probe_error(struct drm_i915_private *i915, int err, + const char *func, int line); +#define i915_inject_probe_error(_i915, _err) \ + __i915_inject_probe_error((_i915), (_err), __func__, __LINE__) +bool i915_error_injected(void); + +#else + +#define i915_inject_probe_error(i915, e) ({ BUILD_BUG_ON_INVALID(i915); 0; }) +#define i915_error_injected() false + +#endif + +#define i915_inject_probe_failure(i915) i915_inject_probe_error((i915), -ENODEV) + +#define i915_probe_error(i915, fmt, ...) ({ \ + if (i915_error_injected()) \ + drm_dbg(&(i915)->drm, fmt, ##__VA_ARGS__); \ + else \ + drm_err(&(i915)->drm, fmt, ##__VA_ARGS__); \ +}) + +#ifndef fetch_and_zero +#define fetch_and_zero(ptr) ({ \ + typeof(*ptr) __T = *(ptr); \ + *(ptr) = (typeof(*ptr))0; \ + __T; \ +}) +#endif + +/* + * 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 */ |