1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2022 Intel Corporation 4 */ 5 6 #include "xe_force_wake.h" 7 8 #include <drm/drm_util.h> 9 10 #include "regs/xe_gt_regs.h" 11 #include "regs/xe_reg_defs.h" 12 #include "xe_gt.h" 13 #include "xe_gt_printk.h" 14 #include "xe_mmio.h" 15 #include "xe_sriov.h" 16 17 #define XE_FORCE_WAKE_ACK_TIMEOUT_MS 50 18 19 static const char *str_wake_sleep(bool wake) 20 { 21 return wake ? "wake" : "sleep"; 22 } 23 24 static void mark_domain_initialized(struct xe_force_wake *fw, 25 enum xe_force_wake_domain_id id) 26 { 27 fw->initialized_domains |= BIT(id); 28 } 29 30 static void init_domain(struct xe_force_wake *fw, 31 enum xe_force_wake_domain_id id, 32 struct xe_reg reg, struct xe_reg ack) 33 { 34 struct xe_force_wake_domain *domain = &fw->domains[id]; 35 36 domain->id = id; 37 domain->reg_ctl = reg; 38 domain->reg_ack = ack; 39 domain->val = FORCEWAKE_MT(FORCEWAKE_KERNEL); 40 domain->mask = FORCEWAKE_MT_MASK(FORCEWAKE_KERNEL); 41 42 mark_domain_initialized(fw, id); 43 } 44 45 void xe_force_wake_init_gt(struct xe_gt *gt, struct xe_force_wake *fw) 46 { 47 struct xe_device *xe = gt_to_xe(gt); 48 49 fw->gt = gt; 50 spin_lock_init(&fw->lock); 51 52 if (xe->info.graphics_verx100 >= 1270) { 53 init_domain(fw, XE_FW_DOMAIN_ID_GT, 54 FORCEWAKE_GT, 55 FORCEWAKE_ACK_GT_MTL); 56 } else { 57 init_domain(fw, XE_FW_DOMAIN_ID_GT, 58 FORCEWAKE_GT, 59 FORCEWAKE_ACK_GT); 60 } 61 } 62 63 void xe_force_wake_init_engines(struct xe_gt *gt, struct xe_force_wake *fw) 64 { 65 int i, j; 66 67 if (xe_gt_is_main_type(gt)) 68 init_domain(fw, XE_FW_DOMAIN_ID_RENDER, 69 FORCEWAKE_RENDER, 70 FORCEWAKE_ACK_RENDER); 71 72 for (i = XE_HW_ENGINE_VCS0, j = 0; i <= XE_HW_ENGINE_VCS7; ++i, ++j) { 73 if (!(gt->info.engine_mask & BIT(i))) 74 continue; 75 76 init_domain(fw, XE_FW_DOMAIN_ID_MEDIA_VDBOX0 + j, 77 FORCEWAKE_MEDIA_VDBOX(j), 78 FORCEWAKE_ACK_MEDIA_VDBOX(j)); 79 } 80 81 for (i = XE_HW_ENGINE_VECS0, j = 0; i <= XE_HW_ENGINE_VECS3; ++i, ++j) { 82 if (!(gt->info.engine_mask & BIT(i))) 83 continue; 84 85 init_domain(fw, XE_FW_DOMAIN_ID_MEDIA_VEBOX0 + j, 86 FORCEWAKE_MEDIA_VEBOX(j), 87 FORCEWAKE_ACK_MEDIA_VEBOX(j)); 88 } 89 90 if (gt->info.engine_mask & BIT(XE_HW_ENGINE_GSCCS0)) 91 init_domain(fw, XE_FW_DOMAIN_ID_GSC, 92 FORCEWAKE_GSC, 93 FORCEWAKE_ACK_GSC); 94 } 95 96 static void __domain_ctl(struct xe_gt *gt, struct xe_force_wake_domain *domain, bool wake) 97 { 98 if (IS_SRIOV_VF(gt_to_xe(gt))) 99 return; 100 101 xe_mmio_write32(>->mmio, domain->reg_ctl, domain->mask | (wake ? domain->val : 0)); 102 } 103 104 static int __domain_wait(struct xe_gt *gt, struct xe_force_wake_domain *domain, bool wake) 105 { 106 u32 value; 107 int ret; 108 109 if (IS_SRIOV_VF(gt_to_xe(gt))) 110 return 0; 111 112 ret = xe_mmio_wait32(>->mmio, domain->reg_ack, domain->val, wake ? domain->val : 0, 113 XE_FORCE_WAKE_ACK_TIMEOUT_MS * USEC_PER_MSEC, 114 &value, true); 115 if (ret) 116 xe_gt_err(gt, "Force wake domain %d failed to ack %s (%pe) reg[%#x] = %#x\n", 117 domain->id, str_wake_sleep(wake), ERR_PTR(ret), 118 domain->reg_ack.addr, value); 119 if (value == ~0) { 120 xe_gt_err(gt, 121 "Force wake domain %d: %s. MMIO unreliable (forcewake register returns 0xFFFFFFFF)!\n", 122 domain->id, str_wake_sleep(wake)); 123 ret = -EIO; 124 } 125 126 return ret; 127 } 128 129 static void domain_wake(struct xe_gt *gt, struct xe_force_wake_domain *domain) 130 { 131 __domain_ctl(gt, domain, true); 132 } 133 134 static int domain_wake_wait(struct xe_gt *gt, 135 struct xe_force_wake_domain *domain) 136 { 137 return __domain_wait(gt, domain, true); 138 } 139 140 static void domain_sleep(struct xe_gt *gt, struct xe_force_wake_domain *domain) 141 { 142 __domain_ctl(gt, domain, false); 143 } 144 145 static int domain_sleep_wait(struct xe_gt *gt, 146 struct xe_force_wake_domain *domain) 147 { 148 return __domain_wait(gt, domain, false); 149 } 150 151 #define for_each_fw_domain_masked(domain__, mask__, fw__, tmp__) \ 152 for (tmp__ = (mask__); tmp__; tmp__ &= ~BIT(ffs(tmp__) - 1)) \ 153 for_each_if((domain__ = ((fw__)->domains + \ 154 (ffs(tmp__) - 1))) && \ 155 domain__->reg_ctl.addr) 156 157 /** 158 * xe_force_wake_get() : Increase the domain refcount 159 * @fw: struct xe_force_wake 160 * @domains: forcewake domains to get refcount on 161 * 162 * This function wakes up @domains if they are asleep and takes references. 163 * If requested domain is XE_FORCEWAKE_ALL then only applicable/initialized 164 * domains will be considered for refcount and it is a caller responsibility 165 * to check returned ref if it includes any specific domain by using 166 * xe_force_wake_ref_has_domain() function. Caller must call 167 * xe_force_wake_put() function to decrease incremented refcounts. 168 * 169 * When possible, scope-based forcewake (through CLASS(xe_force_wake, ...) or 170 * xe_with_force_wake()) should be used instead of direct calls to this 171 * function. Direct usage of get/put should only be used when the function 172 * has goto-based flows that can interfere with scope-based cleanup, or when 173 * the lifetime of the forcewake reference does not match a specific scope 174 * (e.g., forcewake obtained in one function and released in a different one). 175 * 176 * Return: opaque reference to woken domains or zero if none of requested 177 * domains were awake. 178 */ 179 unsigned int __must_check xe_force_wake_get(struct xe_force_wake *fw, 180 enum xe_force_wake_domains domains) 181 { 182 struct xe_gt *gt = fw->gt; 183 struct xe_force_wake_domain *domain; 184 unsigned int ref_incr = 0, awake_rqst = 0, awake_failed = 0; 185 unsigned int tmp, ref_rqst; 186 unsigned long flags; 187 188 xe_gt_assert(gt, is_power_of_2(domains)); 189 xe_gt_assert(gt, domains <= XE_FORCEWAKE_ALL); 190 xe_gt_assert(gt, domains == XE_FORCEWAKE_ALL || fw->initialized_domains & domains); 191 192 ref_rqst = (domains == XE_FORCEWAKE_ALL) ? fw->initialized_domains : domains; 193 spin_lock_irqsave(&fw->lock, flags); 194 for_each_fw_domain_masked(domain, ref_rqst, fw, tmp) { 195 if (!domain->ref++) { 196 awake_rqst |= BIT(domain->id); 197 domain_wake(gt, domain); 198 } 199 ref_incr |= BIT(domain->id); 200 } 201 for_each_fw_domain_masked(domain, awake_rqst, fw, tmp) { 202 if (domain_wake_wait(gt, domain) == 0) { 203 fw->awake_domains |= BIT(domain->id); 204 } else { 205 awake_failed |= BIT(domain->id); 206 --domain->ref; 207 } 208 } 209 ref_incr &= ~awake_failed; 210 spin_unlock_irqrestore(&fw->lock, flags); 211 212 xe_gt_WARN(gt, awake_failed, "Forcewake domain%s %#x failed to acknowledge awake request\n", 213 str_plural(hweight_long(awake_failed)), awake_failed); 214 215 if (domains == XE_FORCEWAKE_ALL && ref_incr == fw->initialized_domains) 216 ref_incr |= XE_FORCEWAKE_ALL; 217 218 return ref_incr; 219 } 220 221 /** 222 * xe_force_wake_put - Decrement the refcount and put domain to sleep if refcount becomes 0 223 * @fw: Pointer to the force wake structure 224 * @fw_ref: return of xe_force_wake_get() 225 * 226 * This function reduces the reference counts for domains in fw_ref. If 227 * refcount for any of the specified domain reaches 0, it puts the domain to sleep 228 * and waits for acknowledgment for domain to sleep within 50 milisec timeout. 229 * Warns in case of timeout of ack from domain. 230 */ 231 void xe_force_wake_put(struct xe_force_wake *fw, unsigned int fw_ref) 232 { 233 struct xe_gt *gt = fw->gt; 234 struct xe_force_wake_domain *domain; 235 unsigned int tmp, sleep = 0; 236 unsigned long flags; 237 int ack_fail = 0; 238 239 /* 240 * Avoid unnecessary lock and unlock when the function is called 241 * in error path of individual domains. 242 */ 243 if (!fw_ref) 244 return; 245 246 if (xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL)) 247 fw_ref = fw->initialized_domains; 248 249 spin_lock_irqsave(&fw->lock, flags); 250 for_each_fw_domain_masked(domain, fw_ref, fw, tmp) { 251 xe_gt_assert(gt, domain->ref); 252 253 if (!--domain->ref) { 254 sleep |= BIT(domain->id); 255 domain_sleep(gt, domain); 256 } 257 } 258 for_each_fw_domain_masked(domain, sleep, fw, tmp) { 259 if (domain_sleep_wait(gt, domain) == 0) 260 fw->awake_domains &= ~BIT(domain->id); 261 else 262 ack_fail |= BIT(domain->id); 263 } 264 spin_unlock_irqrestore(&fw->lock, flags); 265 266 xe_gt_WARN(gt, ack_fail, "Forcewake domain%s %#x failed to acknowledge sleep request\n", 267 str_plural(hweight_long(ack_fail)), ack_fail); 268 } 269