1 /* 2 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved. 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 FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 * SOFTWARE. 22 * 23 * Authors: 24 * Zhi Wang <zhi.a.wang@intel.com> 25 * 26 * Contributors: 27 * Changbin Du <changbin.du@intel.com> 28 * 29 */ 30 31 #include <linux/firmware.h> 32 #include <linux/crc32.h> 33 34 #include "i915_drv.h" 35 #include "gvt.h" 36 #include "i915_pvinfo.h" 37 38 #define FIRMWARE_VERSION (0x0) 39 40 struct gvt_firmware_header { 41 u64 magic; 42 u32 crc32; /* protect the data after this field */ 43 u32 version; 44 u64 cfg_space_size; 45 u64 cfg_space_offset; /* offset in the file */ 46 u64 mmio_size; 47 u64 mmio_offset; /* offset in the file */ 48 unsigned char data[1]; 49 }; 50 51 #define dev_to_drm_minor(d) dev_get_drvdata((d)) 52 53 static ssize_t 54 gvt_firmware_read(struct file *filp, struct kobject *kobj, 55 struct bin_attribute *attr, char *buf, 56 loff_t offset, size_t count) 57 { 58 memcpy(buf, attr->private + offset, count); 59 return count; 60 } 61 62 static struct bin_attribute firmware_attr = { 63 .attr = {.name = "gvt_firmware", .mode = (S_IRUSR)}, 64 .read = gvt_firmware_read, 65 .write = NULL, 66 .mmap = NULL, 67 }; 68 69 static int expose_firmware_sysfs(struct intel_gvt *gvt) 70 { 71 struct intel_gvt_device_info *info = &gvt->device_info; 72 struct drm_i915_private *i915 = gvt->gt->i915; 73 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 74 struct gvt_firmware_header *h; 75 void *firmware; 76 void *p; 77 unsigned long size, crc32_start; 78 int ret; 79 80 size = sizeof(*h) + info->mmio_size + info->cfg_space_size; 81 firmware = vzalloc(size); 82 if (!firmware) 83 return -ENOMEM; 84 85 h = firmware; 86 87 h->magic = VGT_MAGIC; 88 h->version = FIRMWARE_VERSION; 89 h->cfg_space_size = info->cfg_space_size; 90 h->cfg_space_offset = offsetof(struct gvt_firmware_header, data); 91 h->mmio_size = info->mmio_size; 92 h->mmio_offset = h->cfg_space_offset + h->cfg_space_size; 93 94 p = firmware + h->cfg_space_offset; 95 96 memcpy(gvt->firmware.cfg_space, i915->vgpu.initial_cfg_space, 97 info->cfg_space_size); 98 memcpy(p, gvt->firmware.cfg_space, info->cfg_space_size); 99 100 p = firmware + h->mmio_offset; 101 102 memcpy(gvt->firmware.mmio, i915->vgpu.initial_mmio, 103 info->mmio_size); 104 105 memcpy(p, gvt->firmware.mmio, info->mmio_size); 106 107 crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4; 108 h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start); 109 110 firmware_attr.size = size; 111 firmware_attr.private = firmware; 112 113 ret = device_create_bin_file(&pdev->dev, &firmware_attr); 114 if (ret) { 115 vfree(firmware); 116 return ret; 117 } 118 return 0; 119 } 120 121 static void clean_firmware_sysfs(struct intel_gvt *gvt) 122 { 123 struct pci_dev *pdev = to_pci_dev(gvt->gt->i915->drm.dev); 124 125 device_remove_bin_file(&pdev->dev, &firmware_attr); 126 vfree(firmware_attr.private); 127 } 128 129 /** 130 * intel_gvt_free_firmware - free GVT firmware 131 * @gvt: intel gvt device 132 * 133 */ 134 void intel_gvt_free_firmware(struct intel_gvt *gvt) 135 { 136 if (!gvt->firmware.firmware_loaded) 137 clean_firmware_sysfs(gvt); 138 139 kfree(gvt->firmware.cfg_space); 140 vfree(gvt->firmware.mmio); 141 } 142 143 static int verify_firmware(struct intel_gvt *gvt, 144 const struct firmware *fw) 145 { 146 struct intel_gvt_device_info *info = &gvt->device_info; 147 struct pci_dev *pdev = to_pci_dev(gvt->gt->i915->drm.dev); 148 struct gvt_firmware_header *h; 149 unsigned long id, crc32_start; 150 const void *mem; 151 const char *item; 152 u64 file, request; 153 154 h = (struct gvt_firmware_header *)fw->data; 155 156 crc32_start = offsetofend(struct gvt_firmware_header, crc32); 157 mem = fw->data + crc32_start; 158 159 #define VERIFY(s, a, b) do { \ 160 item = (s); file = (u64)(a); request = (u64)(b); \ 161 if ((a) != (b)) \ 162 goto invalid_firmware; \ 163 } while (0) 164 165 VERIFY("magic number", h->magic, VGT_MAGIC); 166 VERIFY("version", h->version, FIRMWARE_VERSION); 167 VERIFY("crc32", h->crc32, crc32_le(0, mem, fw->size - crc32_start)); 168 VERIFY("cfg space size", h->cfg_space_size, info->cfg_space_size); 169 VERIFY("mmio size", h->mmio_size, info->mmio_size); 170 171 mem = (fw->data + h->cfg_space_offset); 172 173 id = *(u16 *)(mem + PCI_VENDOR_ID); 174 VERIFY("vender id", id, pdev->vendor); 175 176 id = *(u16 *)(mem + PCI_DEVICE_ID); 177 VERIFY("device id", id, pdev->device); 178 179 id = *(u8 *)(mem + PCI_REVISION_ID); 180 VERIFY("revision id", id, pdev->revision); 181 182 #undef VERIFY 183 return 0; 184 185 invalid_firmware: 186 gvt_dbg_core("Invalid firmware: %s [file] 0x%llx [request] 0x%llx\n", 187 item, file, request); 188 return -EINVAL; 189 } 190 191 #define GVT_FIRMWARE_PATH "i915/gvt" 192 193 /** 194 * intel_gvt_load_firmware - load GVT firmware 195 * @gvt: intel gvt device 196 * 197 */ 198 int intel_gvt_load_firmware(struct intel_gvt *gvt) 199 { 200 struct intel_gvt_device_info *info = &gvt->device_info; 201 struct pci_dev *pdev = to_pci_dev(gvt->gt->i915->drm.dev); 202 struct intel_gvt_firmware *firmware = &gvt->firmware; 203 struct gvt_firmware_header *h; 204 const struct firmware *fw; 205 char *path; 206 void *mem; 207 int ret; 208 209 path = kmalloc(PATH_MAX, GFP_KERNEL); 210 if (!path) 211 return -ENOMEM; 212 213 mem = kmalloc(info->cfg_space_size, GFP_KERNEL); 214 if (!mem) { 215 kfree(path); 216 return -ENOMEM; 217 } 218 219 firmware->cfg_space = mem; 220 221 mem = vmalloc(info->mmio_size); 222 if (!mem) { 223 kfree(path); 224 kfree(firmware->cfg_space); 225 return -ENOMEM; 226 } 227 228 firmware->mmio = mem; 229 230 sprintf(path, "%s/vid_0x%04x_did_0x%04x_rid_0x%02x.golden_hw_state", 231 GVT_FIRMWARE_PATH, pdev->vendor, pdev->device, 232 pdev->revision); 233 234 gvt_dbg_core("request hw state firmware %s...\n", path); 235 236 ret = request_firmware(&fw, path, gvt->gt->i915->drm.dev); 237 kfree(path); 238 239 if (ret) 240 goto expose_firmware; 241 242 gvt_dbg_core("success.\n"); 243 244 ret = verify_firmware(gvt, fw); 245 if (ret) 246 goto out_free_fw; 247 248 gvt_dbg_core("verified.\n"); 249 250 h = (struct gvt_firmware_header *)fw->data; 251 252 memcpy(firmware->cfg_space, fw->data + h->cfg_space_offset, 253 h->cfg_space_size); 254 memcpy(firmware->mmio, fw->data + h->mmio_offset, 255 h->mmio_size); 256 257 release_firmware(fw); 258 firmware->firmware_loaded = true; 259 return 0; 260 261 out_free_fw: 262 release_firmware(fw); 263 expose_firmware: 264 expose_firmware_sysfs(gvt); 265 return 0; 266 } 267