1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25 #ifndef __I915_UTILS_H 26 #define __I915_UTILS_H 27 28 #include <linux/overflow.h> 29 #include <linux/sched.h> 30 #include <linux/string_helpers.h> 31 #include <linux/types.h> 32 #include <linux/workqueue.h> 33 #include <linux/sched/clock.h> 34 35 #ifdef CONFIG_X86 36 #include <asm/hypervisor.h> 37 #endif 38 39 struct drm_i915_private; 40 41 #define MISSING_CASE(x) WARN(1, "Missing case (%s == %ld)\n", \ 42 __stringify(x), (long)(x)) 43 44 #define i915_probe_error(i915, fmt, ...) ({ \ 45 drm_err(&(i915)->drm, fmt, ##__VA_ARGS__); \ 46 }) 47 48 #define fetch_and_zero(ptr) ({ \ 49 typeof(*ptr) __T = *(ptr); \ 50 *(ptr) = (typeof(*ptr))0; \ 51 __T; \ 52 }) 53 54 /* 55 * check_user_mbz: Check that a user value exists and is zero 56 * 57 * Frequently in our uABI we reserve space for future extensions, and 58 * two ensure that userspace is prepared we enforce that space must 59 * be zero. (Then any future extension can safely assume a default value 60 * of 0.) 61 * 62 * check_user_mbz() combines checking that the user pointer is accessible 63 * and that the contained value is zero. 64 * 65 * Returns: -EFAULT if not accessible, -EINVAL if !zero, or 0 on success. 66 */ 67 #define check_user_mbz(U) ({ \ 68 typeof(*(U)) mbz__; \ 69 get_user(mbz__, (U)) ? -EFAULT : mbz__ ? -EINVAL : 0; \ 70 }) 71 72 #define __mask_next_bit(mask) ({ \ 73 int __idx = ffs(mask) - 1; \ 74 mask &= ~BIT(__idx); \ 75 __idx; \ 76 }) 77 78 static inline bool is_power_of_2_u64(u64 n) 79 { 80 return (n != 0 && ((n & (n - 1)) == 0)); 81 } 82 83 void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint); 84 static inline void __add_taint_for_CI(unsigned int taint) 85 { 86 /* 87 * The system is "ok", just about surviving for the user, but 88 * CI results are now unreliable as the HW is very suspect. 89 * CI checks the taint state after every test and will reboot 90 * the machine if the kernel is tainted. 91 */ 92 add_taint(taint, LOCKDEP_STILL_OK); 93 } 94 95 static inline bool i915_run_as_guest(void) 96 { 97 #if IS_ENABLED(CONFIG_X86) 98 return !hypervisor_is_type(X86_HYPER_NATIVE); 99 #else 100 /* Not supported yet */ 101 return false; 102 #endif 103 } 104 105 bool i915_vtd_active(struct drm_i915_private *i915); 106 107 bool i915_direct_stolen_access(struct drm_i915_private *i915); 108 109 #endif /* !__I915_UTILS_H */ 110