1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2014-2019 Intel Corporation 4 * 5 * Authors: 6 * Vinit Azad <vinit.azad@intel.com> 7 * Ben Widawsky <ben@bwidawsk.net> 8 * Dave Gordon <david.s.gordon@intel.com> 9 * Alex Dai <yu.dai@intel.com> 10 */ 11 12 #include "gt/intel_gt.h" 13 #include "gt/intel_gt_mcr.h" 14 #include "gt/intel_gt_regs.h" 15 #include "gt/intel_rps.h" 16 #include "intel_guc_fw.h" 17 #include "intel_guc_print.h" 18 #include "i915_drv.h" 19 20 static void guc_prepare_xfer(struct intel_gt *gt) 21 { 22 struct intel_uncore *uncore = gt->uncore; 23 24 u32 shim_flags = GUC_ENABLE_READ_CACHE_LOGIC | 25 GUC_ENABLE_READ_CACHE_FOR_SRAM_DATA | 26 GUC_ENABLE_READ_CACHE_FOR_WOPCM_DATA | 27 GUC_ENABLE_MIA_CLOCK_GATING; 28 29 if (GRAPHICS_VER_FULL(uncore->i915) < IP_VER(12, 50)) 30 shim_flags |= GUC_DISABLE_SRAM_INIT_TO_ZEROES | 31 GUC_ENABLE_MIA_CACHING; 32 33 /* Must program this register before loading the ucode with DMA */ 34 intel_uncore_write(uncore, GUC_SHIM_CONTROL, shim_flags); 35 36 if (IS_GEN9_LP(uncore->i915)) 37 intel_uncore_write(uncore, GEN9LP_GT_PM_CONFIG, GT_DOORBELL_ENABLE); 38 else 39 intel_uncore_write(uncore, GEN9_GT_PM_CONFIG, GT_DOORBELL_ENABLE); 40 41 if (GRAPHICS_VER(uncore->i915) == 9) { 42 /* DOP Clock Gating Enable for GuC clocks */ 43 intel_uncore_rmw(uncore, GEN7_MISCCPCTL, 0, 44 GEN8_DOP_CLOCK_GATE_GUC_ENABLE); 45 46 /* allows for 5us (in 10ns units) before GT can go to RC6 */ 47 intel_uncore_write(uncore, GUC_ARAT_C6DIS, 0x1FF); 48 } 49 } 50 51 static int guc_xfer_rsa_mmio(struct intel_uc_fw *guc_fw, 52 struct intel_uncore *uncore) 53 { 54 u32 rsa[UOS_RSA_SCRATCH_COUNT]; 55 size_t copied; 56 int i; 57 58 copied = intel_uc_fw_copy_rsa(guc_fw, rsa, sizeof(rsa)); 59 if (copied < sizeof(rsa)) 60 return -ENOMEM; 61 62 for (i = 0; i < UOS_RSA_SCRATCH_COUNT; i++) 63 intel_uncore_write(uncore, UOS_RSA_SCRATCH(i), rsa[i]); 64 65 return 0; 66 } 67 68 static int guc_xfer_rsa_vma(struct intel_uc_fw *guc_fw, 69 struct intel_uncore *uncore) 70 { 71 struct intel_guc *guc = container_of(guc_fw, struct intel_guc, fw); 72 73 intel_uncore_write(uncore, UOS_RSA_SCRATCH(0), 74 intel_guc_ggtt_offset(guc, guc_fw->rsa_data)); 75 76 return 0; 77 } 78 79 /* Copy RSA signature from the fw image to HW for verification */ 80 static int guc_xfer_rsa(struct intel_uc_fw *guc_fw, 81 struct intel_uncore *uncore) 82 { 83 if (guc_fw->rsa_data) 84 return guc_xfer_rsa_vma(guc_fw, uncore); 85 else 86 return guc_xfer_rsa_mmio(guc_fw, uncore); 87 } 88 89 /* 90 * Read the GuC status register (GUC_STATUS) and store it in the 91 * specified location; then return a boolean indicating whether 92 * the value matches either completion or a known failure code. 93 * 94 * This is used for polling the GuC status in a wait_for() 95 * loop below. 96 */ 97 static inline bool guc_load_done(struct intel_uncore *uncore, u32 *status, bool *success) 98 { 99 u32 val = intel_uncore_read(uncore, GUC_STATUS); 100 u32 uk_val = REG_FIELD_GET(GS_UKERNEL_MASK, val); 101 u32 br_val = REG_FIELD_GET(GS_BOOTROM_MASK, val); 102 103 *status = val; 104 switch (uk_val) { 105 case INTEL_GUC_LOAD_STATUS_READY: 106 *success = true; 107 return true; 108 109 case INTEL_GUC_LOAD_STATUS_ERROR_DEVID_BUILD_MISMATCH: 110 case INTEL_GUC_LOAD_STATUS_GUC_PREPROD_BUILD_MISMATCH: 111 case INTEL_GUC_LOAD_STATUS_ERROR_DEVID_INVALID_GUCTYPE: 112 case INTEL_GUC_LOAD_STATUS_HWCONFIG_ERROR: 113 case INTEL_GUC_LOAD_STATUS_DPC_ERROR: 114 case INTEL_GUC_LOAD_STATUS_EXCEPTION: 115 case INTEL_GUC_LOAD_STATUS_INIT_DATA_INVALID: 116 case INTEL_GUC_LOAD_STATUS_MPU_DATA_INVALID: 117 case INTEL_GUC_LOAD_STATUS_INIT_MMIO_SAVE_RESTORE_INVALID: 118 *success = false; 119 return true; 120 } 121 122 switch (br_val) { 123 case INTEL_BOOTROM_STATUS_NO_KEY_FOUND: 124 case INTEL_BOOTROM_STATUS_RSA_FAILED: 125 case INTEL_BOOTROM_STATUS_PAVPC_FAILED: 126 case INTEL_BOOTROM_STATUS_WOPCM_FAILED: 127 case INTEL_BOOTROM_STATUS_LOADLOC_FAILED: 128 case INTEL_BOOTROM_STATUS_JUMP_FAILED: 129 case INTEL_BOOTROM_STATUS_RC6CTXCONFIG_FAILED: 130 case INTEL_BOOTROM_STATUS_MPUMAP_INCORRECT: 131 case INTEL_BOOTROM_STATUS_EXCEPTION: 132 *success = false; 133 return true; 134 } 135 136 return false; 137 } 138 139 /* 140 * Use a longer timeout for debug builds so that problems can be detected 141 * and analysed. But a shorter timeout for releases so that user's don't 142 * wait forever to find out there is a problem. Note that the only reason 143 * an end user should hit the timeout is in case of extreme thermal throttling. 144 * And a system that is that hot during boot is probably dead anyway! 145 */ 146 #if defined(CONFIG_DRM_I915_DEBUG_GEM) 147 #define GUC_LOAD_RETRY_LIMIT 20 148 #else 149 #define GUC_LOAD_RETRY_LIMIT 3 150 #endif 151 152 static int guc_wait_ucode(struct intel_guc *guc) 153 { 154 struct intel_gt *gt = guc_to_gt(guc); 155 struct intel_uncore *uncore = gt->uncore; 156 ktime_t before, after, delta; 157 bool success; 158 u32 status; 159 int ret, count; 160 u64 delta_ms; 161 u32 before_freq; 162 163 /* 164 * Wait for the GuC to start up. 165 * 166 * Measurements indicate this should take no more than 20ms 167 * (assuming the GT clock is at maximum frequency). So, a 168 * timeout here indicates that the GuC has failed and is unusable. 169 * (Higher levels of the driver may decide to reset the GuC and 170 * attempt the ucode load again if this happens.) 171 * 172 * FIXME: There is a known (but exceedingly unlikely) race condition 173 * where the asynchronous frequency management code could reduce 174 * the GT clock while a GuC reload is in progress (during a full 175 * GT reset). A fix is in progress but there are complex locking 176 * issues to be resolved. In the meantime bump the timeout to 177 * 200ms. Even at slowest clock, this should be sufficient. And 178 * in the working case, a larger timeout makes no difference. 179 * 180 * IFWI updates have also been seen to cause sporadic failures due to 181 * the requested frequency not being granted and thus the firmware 182 * load is attempted at minimum frequency. That can lead to load times 183 * in the seconds range. However, there is a limit on how long an 184 * individual wait_for() can wait. So wrap it in a loop. 185 */ 186 before_freq = intel_rps_read_actual_frequency(&uncore->gt->rps); 187 before = ktime_get(); 188 for (count = 0; count < GUC_LOAD_RETRY_LIMIT; count++) { 189 ret = wait_for(guc_load_done(uncore, &status, &success), 1000); 190 if (!ret || !success) 191 break; 192 193 guc_dbg(guc, "load still in progress, count = %d, freq = %dMHz\n", 194 count, intel_rps_read_actual_frequency(&uncore->gt->rps)); 195 } 196 after = ktime_get(); 197 delta = ktime_sub(after, before); 198 delta_ms = ktime_to_ms(delta); 199 if (ret || !success) { 200 u32 ukernel = REG_FIELD_GET(GS_UKERNEL_MASK, status); 201 u32 bootrom = REG_FIELD_GET(GS_BOOTROM_MASK, status); 202 203 guc_info(guc, "load failed: status = 0x%08X, time = %lldms, freq = %dMHz, ret = %d\n", 204 status, delta_ms, intel_rps_read_actual_frequency(&uncore->gt->rps), ret); 205 guc_info(guc, "load failed: status: Reset = %d, BootROM = 0x%02X, UKernel = 0x%02X, MIA = 0x%02X, Auth = 0x%02X\n", 206 REG_FIELD_GET(GS_MIA_IN_RESET, status), 207 bootrom, ukernel, 208 REG_FIELD_GET(GS_MIA_MASK, status), 209 REG_FIELD_GET(GS_AUTH_STATUS_MASK, status)); 210 211 switch (bootrom) { 212 case INTEL_BOOTROM_STATUS_NO_KEY_FOUND: 213 guc_info(guc, "invalid key requested, header = 0x%08X\n", 214 intel_uncore_read(uncore, GUC_HEADER_INFO)); 215 ret = -ENOEXEC; 216 break; 217 218 case INTEL_BOOTROM_STATUS_RSA_FAILED: 219 guc_info(guc, "firmware signature verification failed\n"); 220 ret = -ENOEXEC; 221 break; 222 } 223 224 switch (ukernel) { 225 case INTEL_GUC_LOAD_STATUS_EXCEPTION: 226 guc_info(guc, "firmware exception. EIP: %#x\n", 227 intel_uncore_read(uncore, SOFT_SCRATCH(13))); 228 ret = -ENXIO; 229 break; 230 231 case INTEL_GUC_LOAD_STATUS_INIT_MMIO_SAVE_RESTORE_INVALID: 232 guc_info(guc, "illegal register in save/restore workaround list\n"); 233 ret = -EPERM; 234 break; 235 236 case INTEL_GUC_LOAD_STATUS_HWCONFIG_START: 237 guc_info(guc, "still extracting hwconfig table.\n"); 238 ret = -ETIMEDOUT; 239 break; 240 } 241 242 /* Uncommon/unexpected error, see earlier status code print for details */ 243 if (ret == 0) 244 ret = -ENXIO; 245 } else if (delta_ms > 200) { 246 guc_warn(guc, "excessive init time: %lldms! [freq = %dMHz, before = %dMHz, status = 0x%08X, count = %d, ret = %d]\n", 247 delta_ms, intel_rps_read_actual_frequency(&uncore->gt->rps), 248 before_freq, status, count, ret); 249 } else { 250 guc_dbg(guc, "init took %lldms, freq = %dMHz, before = %dMHz, status = 0x%08X, count = %d, ret = %d\n", 251 delta_ms, intel_rps_read_actual_frequency(&uncore->gt->rps), 252 before_freq, status, count, ret); 253 } 254 255 return ret; 256 } 257 258 /** 259 * intel_guc_fw_upload() - load GuC uCode to device 260 * @guc: intel_guc structure 261 * 262 * Called from intel_uc_init_hw() during driver load, resume from sleep and 263 * after a GPU reset. 264 * 265 * The firmware image should have already been fetched into memory, so only 266 * check that fetch succeeded, and then transfer the image to the h/w. 267 * 268 * Return: non-zero code on error 269 */ 270 int intel_guc_fw_upload(struct intel_guc *guc) 271 { 272 struct intel_gt *gt = guc_to_gt(guc); 273 struct intel_uncore *uncore = gt->uncore; 274 int ret; 275 276 guc_prepare_xfer(gt); 277 278 /* 279 * Note that GuC needs the CSS header plus uKernel code to be copied 280 * by the DMA engine in one operation, whereas the RSA signature is 281 * loaded separately, either by copying it to the UOS_RSA_SCRATCH 282 * register (if key size <= 256) or through a ggtt-pinned vma (if key 283 * size > 256). The RSA size and therefore the way we provide it to the 284 * HW is fixed for each platform and hard-coded in the bootrom. 285 */ 286 ret = guc_xfer_rsa(&guc->fw, uncore); 287 if (ret) 288 goto out; 289 290 /* 291 * Current uCode expects the code to be loaded at 8k; locations below 292 * this are used for the stack. 293 */ 294 ret = intel_uc_fw_upload(&guc->fw, 0x2000, UOS_MOVE); 295 if (ret) 296 goto out; 297 298 ret = guc_wait_ucode(guc); 299 if (ret) 300 goto out; 301 302 intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_RUNNING); 303 return 0; 304 305 out: 306 intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL); 307 return ret; 308 } 309