1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2013-2021 Intel Corporation 4 */ 5 6 #include "i915_drv.h" 7 #include "i915_reg.h" 8 #include "intel_pcode.h" 9 10 static int gen6_check_mailbox_status(u32 mbox) 11 { 12 switch (mbox & GEN6_PCODE_ERROR_MASK) { 13 case GEN6_PCODE_SUCCESS: 14 return 0; 15 case GEN6_PCODE_UNIMPLEMENTED_CMD: 16 return -ENODEV; 17 case GEN6_PCODE_ILLEGAL_CMD: 18 return -ENXIO; 19 case GEN6_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE: 20 case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE: 21 return -EOVERFLOW; 22 case GEN6_PCODE_TIMEOUT: 23 return -ETIMEDOUT; 24 default: 25 MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK); 26 return 0; 27 } 28 } 29 30 static int gen7_check_mailbox_status(u32 mbox) 31 { 32 switch (mbox & GEN6_PCODE_ERROR_MASK) { 33 case GEN6_PCODE_SUCCESS: 34 return 0; 35 case GEN6_PCODE_ILLEGAL_CMD: 36 return -ENXIO; 37 case GEN7_PCODE_TIMEOUT: 38 return -ETIMEDOUT; 39 case GEN7_PCODE_ILLEGAL_DATA: 40 return -EINVAL; 41 case GEN11_PCODE_ILLEGAL_SUBCOMMAND: 42 return -ENXIO; 43 case GEN11_PCODE_LOCKED: 44 return -EBUSY; 45 case GEN11_PCODE_REJECTED: 46 return -EACCES; 47 case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE: 48 return -EOVERFLOW; 49 default: 50 MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK); 51 return 0; 52 } 53 } 54 55 static int __snb_pcode_rw(struct intel_uncore *uncore, u32 mbox, 56 u32 *val, u32 *val1, 57 int fast_timeout_us, int slow_timeout_ms, 58 bool is_read) 59 { 60 lockdep_assert_held(&uncore->i915->sb_lock); 61 62 /* 63 * GEN6_PCODE_* are outside of the forcewake domain, we can use 64 * intel_uncore_read/write_fw variants to reduce the amount of work 65 * required when reading/writing. 66 */ 67 68 if (intel_uncore_read_fw(uncore, GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) 69 return -EAGAIN; 70 71 intel_uncore_write_fw(uncore, GEN6_PCODE_DATA, *val); 72 intel_uncore_write_fw(uncore, GEN6_PCODE_DATA1, val1 ? *val1 : 0); 73 intel_uncore_write_fw(uncore, 74 GEN6_PCODE_MAILBOX, GEN6_PCODE_READY | mbox); 75 76 if (__intel_wait_for_register_fw(uncore, 77 GEN6_PCODE_MAILBOX, 78 GEN6_PCODE_READY, 0, 79 fast_timeout_us, 80 slow_timeout_ms, 81 &mbox)) 82 return -ETIMEDOUT; 83 84 if (is_read) 85 *val = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA); 86 if (is_read && val1) 87 *val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1); 88 89 if (GRAPHICS_VER(uncore->i915) > 6) 90 return gen7_check_mailbox_status(mbox); 91 else 92 return gen6_check_mailbox_status(mbox); 93 } 94 95 int snb_pcode_read(struct intel_uncore *uncore, u32 mbox, u32 *val, u32 *val1) 96 { 97 int err; 98 99 mutex_lock(&uncore->i915->sb_lock); 100 err = __snb_pcode_rw(uncore, mbox, val, val1, 500, 20, true); 101 mutex_unlock(&uncore->i915->sb_lock); 102 103 if (err) { 104 drm_dbg(&uncore->i915->drm, 105 "warning: pcode (read from mbox %x) mailbox access failed for %ps: %d\n", 106 mbox, __builtin_return_address(0), err); 107 } 108 109 return err; 110 } 111 112 int snb_pcode_write_timeout(struct intel_uncore *uncore, u32 mbox, u32 val, 113 int fast_timeout_us, int slow_timeout_ms) 114 { 115 int err; 116 117 mutex_lock(&uncore->i915->sb_lock); 118 err = __snb_pcode_rw(uncore, mbox, &val, NULL, 119 fast_timeout_us, slow_timeout_ms, false); 120 mutex_unlock(&uncore->i915->sb_lock); 121 122 if (err) { 123 drm_dbg(&uncore->i915->drm, 124 "warning: pcode (write of 0x%08x to mbox %x) mailbox access failed for %ps: %d\n", 125 val, mbox, __builtin_return_address(0), err); 126 } 127 128 return err; 129 } 130 131 static bool skl_pcode_try_request(struct intel_uncore *uncore, u32 mbox, 132 u32 request, u32 reply_mask, u32 reply, 133 u32 *status) 134 { 135 *status = __snb_pcode_rw(uncore, mbox, &request, NULL, 500, 0, true); 136 137 return (*status == 0) && ((request & reply_mask) == reply); 138 } 139 140 /** 141 * skl_pcode_request - send PCODE request until acknowledgment 142 * @uncore: uncore 143 * @mbox: PCODE mailbox ID the request is targeted for 144 * @request: request ID 145 * @reply_mask: mask used to check for request acknowledgment 146 * @reply: value used to check for request acknowledgment 147 * @timeout_base_ms: timeout for polling with preemption enabled 148 * 149 * Keep resending the @request to @mbox until PCODE acknowledges it, PCODE 150 * reports an error or an overall timeout of @timeout_base_ms+50 ms expires. 151 * The request is acknowledged once the PCODE reply dword equals @reply after 152 * applying @reply_mask. Polling is first attempted with preemption enabled 153 * for @timeout_base_ms and if this times out for another 50 ms with 154 * preemption disabled. 155 * 156 * Returns 0 on success, %-ETIMEDOUT in case of a timeout, <0 in case of some 157 * other error as reported by PCODE. 158 */ 159 int skl_pcode_request(struct intel_uncore *uncore, u32 mbox, u32 request, 160 u32 reply_mask, u32 reply, int timeout_base_ms) 161 { 162 u32 status; 163 int ret; 164 165 mutex_lock(&uncore->i915->sb_lock); 166 167 #define COND \ 168 skl_pcode_try_request(uncore, mbox, request, reply_mask, reply, &status) 169 170 /* 171 * Prime the PCODE by doing a request first. Normally it guarantees 172 * that a subsequent request, at most @timeout_base_ms later, succeeds. 173 * _wait_for() doesn't guarantee when its passed condition is evaluated 174 * first, so send the first request explicitly. 175 */ 176 if (COND) { 177 ret = 0; 178 goto out; 179 } 180 ret = _wait_for(COND, timeout_base_ms * 1000, 10, 10); 181 if (!ret) 182 goto out; 183 184 /* 185 * The above can time out if the number of requests was low (2 in the 186 * worst case) _and_ PCODE was busy for some reason even after a 187 * (queued) request and @timeout_base_ms delay. As a workaround retry 188 * the poll with preemption disabled to maximize the number of 189 * requests. Increase the timeout from @timeout_base_ms to 50ms to 190 * account for interrupts that could reduce the number of these 191 * requests, and for any quirks of the PCODE firmware that delays 192 * the request completion. 193 */ 194 drm_dbg_kms(&uncore->i915->drm, 195 "PCODE timeout, retrying with preemption disabled\n"); 196 drm_WARN_ON_ONCE(&uncore->i915->drm, timeout_base_ms > 3); 197 preempt_disable(); 198 ret = wait_for_atomic(COND, 50); 199 preempt_enable(); 200 201 out: 202 mutex_unlock(&uncore->i915->sb_lock); 203 return status ? status : ret; 204 #undef COND 205 } 206 207 int intel_pcode_init(struct intel_uncore *uncore) 208 { 209 if (!IS_DGFX(uncore->i915)) 210 return 0; 211 212 return skl_pcode_request(uncore, DG1_PCODE_STATUS, 213 DG1_UNCORE_GET_INIT_STATUS, 214 DG1_UNCORE_INIT_STATUS_COMPLETE, 215 DG1_UNCORE_INIT_STATUS_COMPLETE, 180000); 216 } 217 218 int snb_pcode_read_p(struct intel_uncore *uncore, u32 mbcmd, u32 p1, u32 p2, u32 *val) 219 { 220 intel_wakeref_t wakeref; 221 u32 mbox; 222 int err; 223 224 mbox = REG_FIELD_PREP(GEN6_PCODE_MB_COMMAND, mbcmd) 225 | REG_FIELD_PREP(GEN6_PCODE_MB_PARAM1, p1) 226 | REG_FIELD_PREP(GEN6_PCODE_MB_PARAM2, p2); 227 228 with_intel_runtime_pm(uncore->rpm, wakeref) 229 err = snb_pcode_read(uncore, mbox, val, NULL); 230 231 return err; 232 } 233 234 int snb_pcode_write_p(struct intel_uncore *uncore, u32 mbcmd, u32 p1, u32 p2, u32 val) 235 { 236 intel_wakeref_t wakeref; 237 u32 mbox; 238 int err; 239 240 mbox = REG_FIELD_PREP(GEN6_PCODE_MB_COMMAND, mbcmd) 241 | REG_FIELD_PREP(GEN6_PCODE_MB_PARAM1, p1) 242 | REG_FIELD_PREP(GEN6_PCODE_MB_PARAM2, p2); 243 244 with_intel_runtime_pm(uncore->rpm, wakeref) 245 err = snb_pcode_write(uncore, mbox, val); 246 247 return err; 248 } 249