1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2023 Advanced Micro Devices, Inc. 4 */ 5 6 #define pr_fmt(fmt) "AMD-Vi: " fmt 7 #define dev_fmt(fmt) pr_fmt(fmt) 8 9 #include <linux/amd-iommu.h> 10 #include <linux/delay.h> 11 #include <linux/mmu_notifier.h> 12 13 #include <asm/iommu.h> 14 15 #include "amd_iommu.h" 16 #include "amd_iommu_types.h" 17 18 #include "../iommu-pages.h" 19 amd_iommu_alloc_ppr_log(struct amd_iommu * iommu)20 int __init amd_iommu_alloc_ppr_log(struct amd_iommu *iommu) 21 { 22 iommu->ppr_log = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO, 23 PPR_LOG_SIZE); 24 return iommu->ppr_log ? 0 : -ENOMEM; 25 } 26 amd_iommu_enable_ppr_log(struct amd_iommu * iommu)27 void amd_iommu_enable_ppr_log(struct amd_iommu *iommu) 28 { 29 u64 entry; 30 31 if (iommu->ppr_log == NULL) 32 return; 33 34 iommu_feature_enable(iommu, CONTROL_PPR_EN); 35 36 entry = iommu_virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512; 37 38 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET, 39 &entry, sizeof(entry)); 40 41 /* set head and tail to zero manually */ 42 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 43 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); 44 45 iommu_feature_enable(iommu, CONTROL_PPRINT_EN); 46 iommu_feature_enable(iommu, CONTROL_PPRLOG_EN); 47 } 48 amd_iommu_free_ppr_log(struct amd_iommu * iommu)49 void __init amd_iommu_free_ppr_log(struct amd_iommu *iommu) 50 { 51 iommu_free_pages(iommu->ppr_log, get_order(PPR_LOG_SIZE)); 52 } 53 54 /* 55 * This function restarts ppr logging in case the IOMMU experienced 56 * PPR log overflow. 57 */ amd_iommu_restart_ppr_log(struct amd_iommu * iommu)58 void amd_iommu_restart_ppr_log(struct amd_iommu *iommu) 59 { 60 amd_iommu_restart_log(iommu, "PPR", CONTROL_PPRINT_EN, 61 CONTROL_PPRLOG_EN, MMIO_STATUS_PPR_RUN_MASK, 62 MMIO_STATUS_PPR_OVERFLOW_MASK); 63 } 64 ppr_flag_to_fault_perm(u16 flag)65 static inline u32 ppr_flag_to_fault_perm(u16 flag) 66 { 67 int perm = 0; 68 69 if (flag & PPR_FLAG_READ) 70 perm |= IOMMU_FAULT_PERM_READ; 71 if (flag & PPR_FLAG_WRITE) 72 perm |= IOMMU_FAULT_PERM_WRITE; 73 if (flag & PPR_FLAG_EXEC) 74 perm |= IOMMU_FAULT_PERM_EXEC; 75 if (!(flag & PPR_FLAG_US)) 76 perm |= IOMMU_FAULT_PERM_PRIV; 77 78 return perm; 79 } 80 ppr_is_valid(struct amd_iommu * iommu,u64 * raw)81 static bool ppr_is_valid(struct amd_iommu *iommu, u64 *raw) 82 { 83 struct device *dev = iommu->iommu.dev; 84 u16 devid = PPR_DEVID(raw[0]); 85 86 if (!(PPR_FLAGS(raw[0]) & PPR_FLAG_GN)) { 87 dev_dbg(dev, "PPR logged [Request ignored due to GN=0 (device=%04x:%02x:%02x.%x " 88 "pasid=0x%05llx address=0x%llx flags=0x%04llx tag=0x%03llx]\n", 89 iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 90 PPR_PASID(raw[0]), raw[1], PPR_FLAGS(raw[0]), PPR_TAG(raw[0])); 91 return false; 92 } 93 94 if (PPR_FLAGS(raw[0]) & PPR_FLAG_RVSD) { 95 dev_dbg(dev, "PPR logged [Invalid request format (device=%04x:%02x:%02x.%x " 96 "pasid=0x%05llx address=0x%llx flags=0x%04llx tag=0x%03llx]\n", 97 iommu->pci_seg->id, PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), 98 PPR_PASID(raw[0]), raw[1], PPR_FLAGS(raw[0]), PPR_TAG(raw[0])); 99 return false; 100 } 101 102 return true; 103 } 104 iommu_call_iopf_notifier(struct amd_iommu * iommu,u64 * raw)105 static void iommu_call_iopf_notifier(struct amd_iommu *iommu, u64 *raw) 106 { 107 struct iommu_dev_data *dev_data; 108 struct iopf_fault event; 109 struct pci_dev *pdev; 110 u16 devid = PPR_DEVID(raw[0]); 111 112 if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) { 113 pr_info_ratelimited("Unknown PPR request received\n"); 114 return; 115 } 116 117 pdev = pci_get_domain_bus_and_slot(iommu->pci_seg->id, 118 PCI_BUS_NUM(devid), devid & 0xff); 119 if (!pdev) 120 return; 121 122 if (!ppr_is_valid(iommu, raw)) 123 goto out; 124 125 memset(&event, 0, sizeof(struct iopf_fault)); 126 127 event.fault.type = IOMMU_FAULT_PAGE_REQ; 128 event.fault.prm.perm = ppr_flag_to_fault_perm(PPR_FLAGS(raw[0])); 129 event.fault.prm.addr = (u64)(raw[1] & PAGE_MASK); 130 event.fault.prm.pasid = PPR_PASID(raw[0]); 131 event.fault.prm.grpid = PPR_TAG(raw[0]) & 0x1FF; 132 133 /* 134 * PASID zero is used for requests from the I/O device without 135 * a PASID 136 */ 137 dev_data = dev_iommu_priv_get(&pdev->dev); 138 if (event.fault.prm.pasid == 0 || 139 event.fault.prm.pasid >= dev_data->max_pasids) { 140 pr_info_ratelimited("Invalid PASID : 0x%x, device : 0x%x\n", 141 event.fault.prm.pasid, pdev->dev.id); 142 goto out; 143 } 144 145 event.fault.prm.flags |= IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID; 146 event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; 147 if (PPR_TAG(raw[0]) & 0x200) 148 event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE; 149 150 /* Submit event */ 151 iommu_report_device_fault(&pdev->dev, &event); 152 153 return; 154 155 out: 156 /* Nobody cared, abort */ 157 amd_iommu_complete_ppr(&pdev->dev, PPR_PASID(raw[0]), 158 IOMMU_PAGE_RESP_FAILURE, 159 PPR_TAG(raw[0]) & 0x1FF); 160 } 161 amd_iommu_poll_ppr_log(struct amd_iommu * iommu)162 void amd_iommu_poll_ppr_log(struct amd_iommu *iommu) 163 { 164 u32 head, tail; 165 166 if (iommu->ppr_log == NULL) 167 return; 168 169 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 170 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); 171 172 while (head != tail) { 173 volatile u64 *raw; 174 u64 entry[2]; 175 int i; 176 177 raw = (u64 *)(iommu->ppr_log + head); 178 179 /* 180 * Hardware bug: Interrupt may arrive before the entry is 181 * written to memory. If this happens we need to wait for the 182 * entry to arrive. 183 */ 184 for (i = 0; i < LOOP_TIMEOUT; ++i) { 185 if (PPR_REQ_TYPE(raw[0]) != 0) 186 break; 187 udelay(1); 188 } 189 190 /* Avoid memcpy function-call overhead */ 191 entry[0] = raw[0]; 192 entry[1] = raw[1]; 193 194 /* 195 * To detect the hardware errata 733 we need to clear the 196 * entry back to zero. This issue does not exist on SNP 197 * enabled system. Also this buffer is not writeable on 198 * SNP enabled system. 199 */ 200 if (!amd_iommu_snp_en) 201 raw[0] = raw[1] = 0UL; 202 203 /* Update head pointer of hardware ring-buffer */ 204 head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE; 205 writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); 206 207 /* Handle PPR entry */ 208 iommu_call_iopf_notifier(iommu, entry); 209 } 210 } 211 212 /************************************************************** 213 * 214 * IOPF handling stuff 215 */ 216 217 /* Setup per-IOMMU IOPF queue if not exist. */ amd_iommu_iopf_init(struct amd_iommu * iommu)218 int amd_iommu_iopf_init(struct amd_iommu *iommu) 219 { 220 int ret = 0; 221 222 if (iommu->iopf_queue) 223 return ret; 224 225 snprintf(iommu->iopfq_name, sizeof(iommu->iopfq_name), "amdvi-%#x", 226 PCI_SEG_DEVID_TO_SBDF(iommu->pci_seg->id, iommu->devid)); 227 228 iommu->iopf_queue = iopf_queue_alloc(iommu->iopfq_name); 229 if (!iommu->iopf_queue) 230 ret = -ENOMEM; 231 232 return ret; 233 } 234 235 /* Destroy per-IOMMU IOPF queue if no longer needed. */ amd_iommu_iopf_uninit(struct amd_iommu * iommu)236 void amd_iommu_iopf_uninit(struct amd_iommu *iommu) 237 { 238 iopf_queue_free(iommu->iopf_queue); 239 iommu->iopf_queue = NULL; 240 } 241 amd_iommu_page_response(struct device * dev,struct iopf_fault * evt,struct iommu_page_response * resp)242 void amd_iommu_page_response(struct device *dev, struct iopf_fault *evt, 243 struct iommu_page_response *resp) 244 { 245 amd_iommu_complete_ppr(dev, resp->pasid, resp->code, resp->grpid); 246 } 247 amd_iommu_iopf_add_device(struct amd_iommu * iommu,struct iommu_dev_data * dev_data)248 int amd_iommu_iopf_add_device(struct amd_iommu *iommu, 249 struct iommu_dev_data *dev_data) 250 { 251 int ret = 0; 252 253 if (!dev_data->pri_enabled) 254 return ret; 255 256 if (!iommu->iopf_queue) 257 return -EINVAL; 258 259 ret = iopf_queue_add_device(iommu->iopf_queue, dev_data->dev); 260 if (ret) 261 return ret; 262 263 dev_data->ppr = true; 264 return 0; 265 } 266 267 /* Its assumed that caller has verified that device was added to iopf queue */ amd_iommu_iopf_remove_device(struct amd_iommu * iommu,struct iommu_dev_data * dev_data)268 void amd_iommu_iopf_remove_device(struct amd_iommu *iommu, 269 struct iommu_dev_data *dev_data) 270 { 271 iopf_queue_remove_device(iommu->iopf_queue, dev_data->dev); 272 dev_data->ppr = false; 273 } 274