Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1 | /* |
| 2 | * VFIO PCI config space virtualization |
| 3 | * |
| 4 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. |
| 5 | * Author: Alex Williamson <alex.williamson@redhat.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * Derived from original vfio: |
| 12 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. |
| 13 | * Author: Tom Lyon, pugs@cisco.com |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * This code handles reading and writing of PCI configuration registers. |
| 18 | * This is hairy because we want to allow a lot of flexibility to the |
| 19 | * user driver, but cannot trust it with all of the config fields. |
| 20 | * Tables determine which fields can be read and written, as well as |
| 21 | * which fields are 'virtualized' - special actions and translations to |
| 22 | * make it appear to the user that he has control, when in fact things |
| 23 | * must be negotiated with the underlying OS. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/pci.h> |
| 28 | #include <linux/uaccess.h> |
| 29 | #include <linux/vfio.h> |
Arnd Bergmann | 25e9789 | 2013-03-15 12:58:20 -0600 | [diff] [blame] | 30 | #include <linux/slab.h> |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 31 | |
| 32 | #include "vfio_pci_private.h" |
| 33 | |
| 34 | #define PCI_CFG_SPACE_SIZE 256 |
| 35 | |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 36 | /* Fake capability ID for standard config space */ |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 37 | #define PCI_CAP_ID_BASIC 0 |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 38 | |
| 39 | #define is_bar(offset) \ |
| 40 | ((offset >= PCI_BASE_ADDRESS_0 && offset < PCI_BASE_ADDRESS_5 + 4) || \ |
| 41 | (offset >= PCI_ROM_ADDRESS && offset < PCI_ROM_ADDRESS + 4)) |
| 42 | |
| 43 | /* |
| 44 | * Lengths of PCI Config Capabilities |
| 45 | * 0: Removed from the user visible capability list |
| 46 | * FF: Variable length |
| 47 | */ |
Dan Carpenter | 222e684 | 2015-11-09 15:24:55 +0300 | [diff] [blame] | 48 | static const u8 pci_cap_length[PCI_CAP_ID_MAX + 1] = { |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 49 | [PCI_CAP_ID_BASIC] = PCI_STD_HEADER_SIZEOF, /* pci config header */ |
| 50 | [PCI_CAP_ID_PM] = PCI_PM_SIZEOF, |
| 51 | [PCI_CAP_ID_AGP] = PCI_AGP_SIZEOF, |
| 52 | [PCI_CAP_ID_VPD] = PCI_CAP_VPD_SIZEOF, |
| 53 | [PCI_CAP_ID_SLOTID] = 0, /* bridge - don't care */ |
| 54 | [PCI_CAP_ID_MSI] = 0xFF, /* 10, 14, 20, or 24 */ |
| 55 | [PCI_CAP_ID_CHSWP] = 0, /* cpci - not yet */ |
| 56 | [PCI_CAP_ID_PCIX] = 0xFF, /* 8 or 24 */ |
| 57 | [PCI_CAP_ID_HT] = 0xFF, /* hypertransport */ |
| 58 | [PCI_CAP_ID_VNDR] = 0xFF, /* variable */ |
| 59 | [PCI_CAP_ID_DBG] = 0, /* debug - don't care */ |
| 60 | [PCI_CAP_ID_CCRC] = 0, /* cpci - not yet */ |
| 61 | [PCI_CAP_ID_SHPC] = 0, /* hotswap - not yet */ |
| 62 | [PCI_CAP_ID_SSVID] = 0, /* bridge - don't care */ |
| 63 | [PCI_CAP_ID_AGP3] = 0, /* AGP8x - not yet */ |
| 64 | [PCI_CAP_ID_SECDEV] = 0, /* secure device not yet */ |
| 65 | [PCI_CAP_ID_EXP] = 0xFF, /* 20 or 44 */ |
| 66 | [PCI_CAP_ID_MSIX] = PCI_CAP_MSIX_SIZEOF, |
| 67 | [PCI_CAP_ID_SATA] = 0xFF, |
| 68 | [PCI_CAP_ID_AF] = PCI_CAP_AF_SIZEOF, |
| 69 | }; |
| 70 | |
| 71 | /* |
| 72 | * Lengths of PCIe/PCI-X Extended Config Capabilities |
| 73 | * 0: Removed or masked from the user visible capabilty list |
| 74 | * FF: Variable length |
| 75 | */ |
Dan Carpenter | 222e684 | 2015-11-09 15:24:55 +0300 | [diff] [blame] | 76 | static const u16 pci_ext_cap_length[PCI_EXT_CAP_ID_MAX + 1] = { |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 77 | [PCI_EXT_CAP_ID_ERR] = PCI_ERR_ROOT_COMMAND, |
| 78 | [PCI_EXT_CAP_ID_VC] = 0xFF, |
| 79 | [PCI_EXT_CAP_ID_DSN] = PCI_EXT_CAP_DSN_SIZEOF, |
| 80 | [PCI_EXT_CAP_ID_PWR] = PCI_EXT_CAP_PWR_SIZEOF, |
| 81 | [PCI_EXT_CAP_ID_RCLD] = 0, /* root only - don't care */ |
| 82 | [PCI_EXT_CAP_ID_RCILC] = 0, /* root only - don't care */ |
| 83 | [PCI_EXT_CAP_ID_RCEC] = 0, /* root only - don't care */ |
| 84 | [PCI_EXT_CAP_ID_MFVC] = 0xFF, |
| 85 | [PCI_EXT_CAP_ID_VC9] = 0xFF, /* same as CAP_ID_VC */ |
| 86 | [PCI_EXT_CAP_ID_RCRB] = 0, /* root only - don't care */ |
| 87 | [PCI_EXT_CAP_ID_VNDR] = 0xFF, |
| 88 | [PCI_EXT_CAP_ID_CAC] = 0, /* obsolete */ |
| 89 | [PCI_EXT_CAP_ID_ACS] = 0xFF, |
| 90 | [PCI_EXT_CAP_ID_ARI] = PCI_EXT_CAP_ARI_SIZEOF, |
| 91 | [PCI_EXT_CAP_ID_ATS] = PCI_EXT_CAP_ATS_SIZEOF, |
| 92 | [PCI_EXT_CAP_ID_SRIOV] = PCI_EXT_CAP_SRIOV_SIZEOF, |
| 93 | [PCI_EXT_CAP_ID_MRIOV] = 0, /* not yet */ |
| 94 | [PCI_EXT_CAP_ID_MCAST] = PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF, |
| 95 | [PCI_EXT_CAP_ID_PRI] = PCI_EXT_CAP_PRI_SIZEOF, |
| 96 | [PCI_EXT_CAP_ID_AMD_XXX] = 0, /* not yet */ |
| 97 | [PCI_EXT_CAP_ID_REBAR] = 0xFF, |
| 98 | [PCI_EXT_CAP_ID_DPA] = 0xFF, |
| 99 | [PCI_EXT_CAP_ID_TPH] = 0xFF, |
| 100 | [PCI_EXT_CAP_ID_LTR] = PCI_EXT_CAP_LTR_SIZEOF, |
| 101 | [PCI_EXT_CAP_ID_SECPCI] = 0, /* not yet */ |
| 102 | [PCI_EXT_CAP_ID_PMUX] = 0, /* not yet */ |
| 103 | [PCI_EXT_CAP_ID_PASID] = 0, /* not yet */ |
| 104 | }; |
| 105 | |
| 106 | /* |
| 107 | * Read/Write Permission Bits - one bit for each bit in capability |
| 108 | * Any field can be read if it exists, but what is read depends on |
| 109 | * whether the field is 'virtualized', or just pass thru to the |
| 110 | * hardware. Any virtualized field is also virtualized for writes. |
| 111 | * Writes are only permitted if they have a 1 bit here. |
| 112 | */ |
| 113 | struct perm_bits { |
| 114 | u8 *virt; /* read/write virtual data, not hw */ |
| 115 | u8 *write; /* writeable bits */ |
| 116 | int (*readfn)(struct vfio_pci_device *vdev, int pos, int count, |
| 117 | struct perm_bits *perm, int offset, __le32 *val); |
| 118 | int (*writefn)(struct vfio_pci_device *vdev, int pos, int count, |
| 119 | struct perm_bits *perm, int offset, __le32 val); |
| 120 | }; |
| 121 | |
| 122 | #define NO_VIRT 0 |
| 123 | #define ALL_VIRT 0xFFFFFFFFU |
| 124 | #define NO_WRITE 0 |
| 125 | #define ALL_WRITE 0xFFFFFFFFU |
| 126 | |
| 127 | static int vfio_user_config_read(struct pci_dev *pdev, int offset, |
| 128 | __le32 *val, int count) |
| 129 | { |
| 130 | int ret = -EINVAL; |
| 131 | u32 tmp_val = 0; |
| 132 | |
| 133 | switch (count) { |
| 134 | case 1: |
| 135 | { |
| 136 | u8 tmp; |
| 137 | ret = pci_user_read_config_byte(pdev, offset, &tmp); |
| 138 | tmp_val = tmp; |
| 139 | break; |
| 140 | } |
| 141 | case 2: |
| 142 | { |
| 143 | u16 tmp; |
| 144 | ret = pci_user_read_config_word(pdev, offset, &tmp); |
| 145 | tmp_val = tmp; |
| 146 | break; |
| 147 | } |
| 148 | case 4: |
| 149 | ret = pci_user_read_config_dword(pdev, offset, &tmp_val); |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | *val = cpu_to_le32(tmp_val); |
| 154 | |
| 155 | return pcibios_err_to_errno(ret); |
| 156 | } |
| 157 | |
| 158 | static int vfio_user_config_write(struct pci_dev *pdev, int offset, |
| 159 | __le32 val, int count) |
| 160 | { |
| 161 | int ret = -EINVAL; |
| 162 | u32 tmp_val = le32_to_cpu(val); |
| 163 | |
| 164 | switch (count) { |
| 165 | case 1: |
| 166 | ret = pci_user_write_config_byte(pdev, offset, tmp_val); |
| 167 | break; |
| 168 | case 2: |
| 169 | ret = pci_user_write_config_word(pdev, offset, tmp_val); |
| 170 | break; |
| 171 | case 4: |
| 172 | ret = pci_user_write_config_dword(pdev, offset, tmp_val); |
| 173 | break; |
| 174 | } |
| 175 | |
| 176 | return pcibios_err_to_errno(ret); |
| 177 | } |
| 178 | |
| 179 | static int vfio_default_config_read(struct vfio_pci_device *vdev, int pos, |
| 180 | int count, struct perm_bits *perm, |
| 181 | int offset, __le32 *val) |
| 182 | { |
| 183 | __le32 virt = 0; |
| 184 | |
| 185 | memcpy(val, vdev->vconfig + pos, count); |
| 186 | |
| 187 | memcpy(&virt, perm->virt + offset, count); |
| 188 | |
| 189 | /* Any non-virtualized bits? */ |
| 190 | if (cpu_to_le32(~0U >> (32 - (count * 8))) != virt) { |
| 191 | struct pci_dev *pdev = vdev->pdev; |
| 192 | __le32 phys_val = 0; |
| 193 | int ret; |
| 194 | |
| 195 | ret = vfio_user_config_read(pdev, pos, &phys_val, count); |
| 196 | if (ret) |
| 197 | return ret; |
| 198 | |
| 199 | *val = (phys_val & ~virt) | (*val & virt); |
| 200 | } |
| 201 | |
| 202 | return count; |
| 203 | } |
| 204 | |
| 205 | static int vfio_default_config_write(struct vfio_pci_device *vdev, int pos, |
| 206 | int count, struct perm_bits *perm, |
| 207 | int offset, __le32 val) |
| 208 | { |
| 209 | __le32 virt = 0, write = 0; |
| 210 | |
| 211 | memcpy(&write, perm->write + offset, count); |
| 212 | |
| 213 | if (!write) |
| 214 | return count; /* drop, no writable bits */ |
| 215 | |
| 216 | memcpy(&virt, perm->virt + offset, count); |
| 217 | |
| 218 | /* Virtualized and writable bits go to vconfig */ |
| 219 | if (write & virt) { |
| 220 | __le32 virt_val = 0; |
| 221 | |
| 222 | memcpy(&virt_val, vdev->vconfig + pos, count); |
| 223 | |
| 224 | virt_val &= ~(write & virt); |
| 225 | virt_val |= (val & (write & virt)); |
| 226 | |
| 227 | memcpy(vdev->vconfig + pos, &virt_val, count); |
| 228 | } |
| 229 | |
| 230 | /* Non-virtualzed and writable bits go to hardware */ |
| 231 | if (write & ~virt) { |
| 232 | struct pci_dev *pdev = vdev->pdev; |
| 233 | __le32 phys_val = 0; |
| 234 | int ret; |
| 235 | |
| 236 | ret = vfio_user_config_read(pdev, pos, &phys_val, count); |
| 237 | if (ret) |
| 238 | return ret; |
| 239 | |
| 240 | phys_val &= ~(write & ~virt); |
| 241 | phys_val |= (val & (write & ~virt)); |
| 242 | |
| 243 | ret = vfio_user_config_write(pdev, pos, phys_val, count); |
| 244 | if (ret) |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | return count; |
| 249 | } |
| 250 | |
| 251 | /* Allow direct read from hardware, except for capability next pointer */ |
| 252 | static int vfio_direct_config_read(struct vfio_pci_device *vdev, int pos, |
| 253 | int count, struct perm_bits *perm, |
| 254 | int offset, __le32 *val) |
| 255 | { |
| 256 | int ret; |
| 257 | |
| 258 | ret = vfio_user_config_read(vdev->pdev, pos, val, count); |
| 259 | if (ret) |
| 260 | return pcibios_err_to_errno(ret); |
| 261 | |
| 262 | if (pos >= PCI_CFG_SPACE_SIZE) { /* Extended cap header mangling */ |
| 263 | if (offset < 4) |
| 264 | memcpy(val, vdev->vconfig + pos, count); |
| 265 | } else if (pos >= PCI_STD_HEADER_SIZEOF) { /* Std cap mangling */ |
| 266 | if (offset == PCI_CAP_LIST_ID && count > 1) |
| 267 | memcpy(val, vdev->vconfig + pos, |
| 268 | min(PCI_CAP_FLAGS, count)); |
| 269 | else if (offset == PCI_CAP_LIST_NEXT) |
| 270 | memcpy(val, vdev->vconfig + pos, 1); |
| 271 | } |
| 272 | |
| 273 | return count; |
| 274 | } |
| 275 | |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 276 | /* Raw access skips any kind of virtualization */ |
| 277 | static int vfio_raw_config_write(struct vfio_pci_device *vdev, int pos, |
| 278 | int count, struct perm_bits *perm, |
| 279 | int offset, __le32 val) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 280 | { |
| 281 | int ret; |
| 282 | |
| 283 | ret = vfio_user_config_write(vdev->pdev, pos, val, count); |
| 284 | if (ret) |
| 285 | return ret; |
| 286 | |
| 287 | return count; |
| 288 | } |
| 289 | |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 290 | static int vfio_raw_config_read(struct vfio_pci_device *vdev, int pos, |
| 291 | int count, struct perm_bits *perm, |
| 292 | int offset, __le32 *val) |
| 293 | { |
| 294 | int ret; |
| 295 | |
| 296 | ret = vfio_user_config_read(vdev->pdev, pos, val, count); |
| 297 | if (ret) |
| 298 | return pcibios_err_to_errno(ret); |
| 299 | |
| 300 | return count; |
| 301 | } |
| 302 | |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 303 | /* Virt access uses only virtualization */ |
| 304 | static int vfio_virt_config_write(struct vfio_pci_device *vdev, int pos, |
| 305 | int count, struct perm_bits *perm, |
| 306 | int offset, __le32 val) |
| 307 | { |
| 308 | memcpy(vdev->vconfig + pos, &val, count); |
| 309 | return count; |
| 310 | } |
| 311 | |
| 312 | static int vfio_virt_config_read(struct vfio_pci_device *vdev, int pos, |
| 313 | int count, struct perm_bits *perm, |
| 314 | int offset, __le32 *val) |
| 315 | { |
| 316 | memcpy(val, vdev->vconfig + pos, count); |
| 317 | return count; |
| 318 | } |
| 319 | |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 320 | /* Default capability regions to read-only, no-virtualization */ |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 321 | static struct perm_bits cap_perms[PCI_CAP_ID_MAX + 1] = { |
| 322 | [0 ... PCI_CAP_ID_MAX] = { .readfn = vfio_direct_config_read } |
| 323 | }; |
| 324 | static struct perm_bits ecap_perms[PCI_EXT_CAP_ID_MAX + 1] = { |
| 325 | [0 ... PCI_EXT_CAP_ID_MAX] = { .readfn = vfio_direct_config_read } |
| 326 | }; |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 327 | /* |
| 328 | * Default unassigned regions to raw read-write access. Some devices |
| 329 | * require this to function as they hide registers between the gaps in |
| 330 | * config space (be2net). Like MMIO and I/O port registers, we have |
| 331 | * to trust the hardware isolation. |
| 332 | */ |
| 333 | static struct perm_bits unassigned_perms = { |
| 334 | .readfn = vfio_raw_config_read, |
| 335 | .writefn = vfio_raw_config_write |
| 336 | }; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 337 | |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 338 | static struct perm_bits virt_perms = { |
| 339 | .readfn = vfio_virt_config_read, |
| 340 | .writefn = vfio_virt_config_write |
| 341 | }; |
| 342 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 343 | static void free_perm_bits(struct perm_bits *perm) |
| 344 | { |
| 345 | kfree(perm->virt); |
| 346 | kfree(perm->write); |
| 347 | perm->virt = NULL; |
| 348 | perm->write = NULL; |
| 349 | } |
| 350 | |
| 351 | static int alloc_perm_bits(struct perm_bits *perm, int size) |
| 352 | { |
| 353 | /* |
| 354 | * Round up all permission bits to the next dword, this lets us |
| 355 | * ignore whether a read/write exceeds the defined capability |
| 356 | * structure. We can do this because: |
| 357 | * - Standard config space is already dword aligned |
| 358 | * - Capabilities are all dword alinged (bits 0:1 of next reserved) |
| 359 | * - Express capabilities defined as dword aligned |
| 360 | */ |
| 361 | size = round_up(size, 4); |
| 362 | |
| 363 | /* |
| 364 | * Zero state is |
| 365 | * - All Readable, None Writeable, None Virtualized |
| 366 | */ |
| 367 | perm->virt = kzalloc(size, GFP_KERNEL); |
| 368 | perm->write = kzalloc(size, GFP_KERNEL); |
| 369 | if (!perm->virt || !perm->write) { |
| 370 | free_perm_bits(perm); |
| 371 | return -ENOMEM; |
| 372 | } |
| 373 | |
| 374 | perm->readfn = vfio_default_config_read; |
| 375 | perm->writefn = vfio_default_config_write; |
| 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Helper functions for filling in permission tables |
| 382 | */ |
| 383 | static inline void p_setb(struct perm_bits *p, int off, u8 virt, u8 write) |
| 384 | { |
| 385 | p->virt[off] = virt; |
| 386 | p->write[off] = write; |
| 387 | } |
| 388 | |
| 389 | /* Handle endian-ness - pci and tables are little-endian */ |
| 390 | static inline void p_setw(struct perm_bits *p, int off, u16 virt, u16 write) |
| 391 | { |
| 392 | *(__le16 *)(&p->virt[off]) = cpu_to_le16(virt); |
| 393 | *(__le16 *)(&p->write[off]) = cpu_to_le16(write); |
| 394 | } |
| 395 | |
| 396 | /* Handle endian-ness - pci and tables are little-endian */ |
| 397 | static inline void p_setd(struct perm_bits *p, int off, u32 virt, u32 write) |
| 398 | { |
| 399 | *(__le32 *)(&p->virt[off]) = cpu_to_le32(virt); |
| 400 | *(__le32 *)(&p->write[off]) = cpu_to_le32(write); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Restore the *real* BARs after we detect a FLR or backdoor reset. |
| 405 | * (backdoor = some device specific technique that we didn't catch) |
| 406 | */ |
| 407 | static void vfio_bar_restore(struct vfio_pci_device *vdev) |
| 408 | { |
| 409 | struct pci_dev *pdev = vdev->pdev; |
| 410 | u32 *rbar = vdev->rbar; |
| 411 | int i; |
| 412 | |
| 413 | if (pdev->is_virtfn) |
| 414 | return; |
| 415 | |
| 416 | pr_info("%s: %s reset recovery - restoring bars\n", |
| 417 | __func__, dev_name(&pdev->dev)); |
| 418 | |
| 419 | for (i = PCI_BASE_ADDRESS_0; i <= PCI_BASE_ADDRESS_5; i += 4, rbar++) |
| 420 | pci_user_write_config_dword(pdev, i, *rbar); |
| 421 | |
| 422 | pci_user_write_config_dword(pdev, PCI_ROM_ADDRESS, *rbar); |
| 423 | } |
| 424 | |
| 425 | static __le32 vfio_generate_bar_flags(struct pci_dev *pdev, int bar) |
| 426 | { |
| 427 | unsigned long flags = pci_resource_flags(pdev, bar); |
| 428 | u32 val; |
| 429 | |
| 430 | if (flags & IORESOURCE_IO) |
| 431 | return cpu_to_le32(PCI_BASE_ADDRESS_SPACE_IO); |
| 432 | |
| 433 | val = PCI_BASE_ADDRESS_SPACE_MEMORY; |
| 434 | |
| 435 | if (flags & IORESOURCE_PREFETCH) |
| 436 | val |= PCI_BASE_ADDRESS_MEM_PREFETCH; |
| 437 | |
| 438 | if (flags & IORESOURCE_MEM_64) |
| 439 | val |= PCI_BASE_ADDRESS_MEM_TYPE_64; |
| 440 | |
| 441 | return cpu_to_le32(val); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Pretend we're hardware and tweak the values of the *virtual* PCI BARs |
| 446 | * to reflect the hardware capabilities. This implements BAR sizing. |
| 447 | */ |
| 448 | static void vfio_bar_fixup(struct vfio_pci_device *vdev) |
| 449 | { |
| 450 | struct pci_dev *pdev = vdev->pdev; |
| 451 | int i; |
| 452 | __le32 *bar; |
| 453 | u64 mask; |
| 454 | |
| 455 | bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0]; |
| 456 | |
| 457 | for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) { |
| 458 | if (!pci_resource_start(pdev, i)) { |
| 459 | *bar = 0; /* Unmapped by host = unimplemented to user */ |
| 460 | continue; |
| 461 | } |
| 462 | |
| 463 | mask = ~(pci_resource_len(pdev, i) - 1); |
| 464 | |
| 465 | *bar &= cpu_to_le32((u32)mask); |
| 466 | *bar |= vfio_generate_bar_flags(pdev, i); |
| 467 | |
| 468 | if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) { |
| 469 | bar++; |
| 470 | *bar &= cpu_to_le32((u32)(mask >> 32)); |
| 471 | i++; |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS]; |
| 476 | |
| 477 | /* |
Alex Williamson | a13b645 | 2016-02-22 16:02:46 -0700 | [diff] [blame] | 478 | * NB. REGION_INFO will have reported zero size if we weren't able |
| 479 | * to read the ROM, but we still return the actual BAR size here if |
| 480 | * it exists (or the shadow ROM space). |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 481 | */ |
| 482 | if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) { |
| 483 | mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1); |
| 484 | mask |= PCI_ROM_ADDRESS_ENABLE; |
| 485 | *bar &= cpu_to_le32((u32)mask); |
Alex Williamson | a13b645 | 2016-02-22 16:02:46 -0700 | [diff] [blame] | 486 | } else if (pdev->resource[PCI_ROM_RESOURCE].flags & |
| 487 | IORESOURCE_ROM_SHADOW) { |
| 488 | mask = ~(0x20000 - 1); |
| 489 | mask |= PCI_ROM_ADDRESS_ENABLE; |
| 490 | *bar &= cpu_to_le32((u32)mask); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 491 | } else |
| 492 | *bar = 0; |
| 493 | |
| 494 | vdev->bardirty = false; |
| 495 | } |
| 496 | |
| 497 | static int vfio_basic_config_read(struct vfio_pci_device *vdev, int pos, |
| 498 | int count, struct perm_bits *perm, |
| 499 | int offset, __le32 *val) |
| 500 | { |
| 501 | if (is_bar(offset)) /* pos == offset for basic config */ |
| 502 | vfio_bar_fixup(vdev); |
| 503 | |
| 504 | count = vfio_default_config_read(vdev, pos, count, perm, offset, val); |
| 505 | |
| 506 | /* Mask in virtual memory enable for SR-IOV devices */ |
| 507 | if (offset == PCI_COMMAND && vdev->pdev->is_virtfn) { |
| 508 | u16 cmd = le16_to_cpu(*(__le16 *)&vdev->vconfig[PCI_COMMAND]); |
| 509 | u32 tmp_val = le32_to_cpu(*val); |
| 510 | |
| 511 | tmp_val |= cmd & PCI_COMMAND_MEMORY; |
| 512 | *val = cpu_to_le32(tmp_val); |
| 513 | } |
| 514 | |
| 515 | return count; |
| 516 | } |
| 517 | |
| 518 | static int vfio_basic_config_write(struct vfio_pci_device *vdev, int pos, |
| 519 | int count, struct perm_bits *perm, |
| 520 | int offset, __le32 val) |
| 521 | { |
| 522 | struct pci_dev *pdev = vdev->pdev; |
| 523 | __le16 *virt_cmd; |
| 524 | u16 new_cmd = 0; |
| 525 | int ret; |
| 526 | |
| 527 | virt_cmd = (__le16 *)&vdev->vconfig[PCI_COMMAND]; |
| 528 | |
| 529 | if (offset == PCI_COMMAND) { |
| 530 | bool phys_mem, virt_mem, new_mem, phys_io, virt_io, new_io; |
| 531 | u16 phys_cmd; |
| 532 | |
| 533 | ret = pci_user_read_config_word(pdev, PCI_COMMAND, &phys_cmd); |
| 534 | if (ret) |
| 535 | return ret; |
| 536 | |
| 537 | new_cmd = le32_to_cpu(val); |
| 538 | |
| 539 | phys_mem = !!(phys_cmd & PCI_COMMAND_MEMORY); |
| 540 | virt_mem = !!(le16_to_cpu(*virt_cmd) & PCI_COMMAND_MEMORY); |
| 541 | new_mem = !!(new_cmd & PCI_COMMAND_MEMORY); |
| 542 | |
| 543 | phys_io = !!(phys_cmd & PCI_COMMAND_IO); |
| 544 | virt_io = !!(le16_to_cpu(*virt_cmd) & PCI_COMMAND_IO); |
| 545 | new_io = !!(new_cmd & PCI_COMMAND_IO); |
| 546 | |
| 547 | /* |
| 548 | * If the user is writing mem/io enable (new_mem/io) and we |
| 549 | * think it's already enabled (virt_mem/io), but the hardware |
| 550 | * shows it disabled (phys_mem/io, then the device has |
| 551 | * undergone some kind of backdoor reset and needs to be |
| 552 | * restored before we allow it to enable the bars. |
| 553 | * SR-IOV devices will trigger this, but we catch them later |
| 554 | */ |
| 555 | if ((new_mem && virt_mem && !phys_mem) || |
| 556 | (new_io && virt_io && !phys_io)) |
| 557 | vfio_bar_restore(vdev); |
| 558 | } |
| 559 | |
| 560 | count = vfio_default_config_write(vdev, pos, count, perm, offset, val); |
| 561 | if (count < 0) |
| 562 | return count; |
| 563 | |
| 564 | /* |
| 565 | * Save current memory/io enable bits in vconfig to allow for |
| 566 | * the test above next time. |
| 567 | */ |
| 568 | if (offset == PCI_COMMAND) { |
| 569 | u16 mask = PCI_COMMAND_MEMORY | PCI_COMMAND_IO; |
| 570 | |
| 571 | *virt_cmd &= cpu_to_le16(~mask); |
| 572 | *virt_cmd |= cpu_to_le16(new_cmd & mask); |
| 573 | } |
| 574 | |
| 575 | /* Emulate INTx disable */ |
| 576 | if (offset >= PCI_COMMAND && offset <= PCI_COMMAND + 1) { |
| 577 | bool virt_intx_disable; |
| 578 | |
| 579 | virt_intx_disable = !!(le16_to_cpu(*virt_cmd) & |
| 580 | PCI_COMMAND_INTX_DISABLE); |
| 581 | |
| 582 | if (virt_intx_disable && !vdev->virq_disabled) { |
| 583 | vdev->virq_disabled = true; |
| 584 | vfio_pci_intx_mask(vdev); |
| 585 | } else if (!virt_intx_disable && vdev->virq_disabled) { |
| 586 | vdev->virq_disabled = false; |
| 587 | vfio_pci_intx_unmask(vdev); |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | if (is_bar(offset)) |
| 592 | vdev->bardirty = true; |
| 593 | |
| 594 | return count; |
| 595 | } |
| 596 | |
| 597 | /* Permissions for the Basic PCI Header */ |
| 598 | static int __init init_pci_cap_basic_perm(struct perm_bits *perm) |
| 599 | { |
| 600 | if (alloc_perm_bits(perm, PCI_STD_HEADER_SIZEOF)) |
| 601 | return -ENOMEM; |
| 602 | |
| 603 | perm->readfn = vfio_basic_config_read; |
| 604 | perm->writefn = vfio_basic_config_write; |
| 605 | |
| 606 | /* Virtualized for SR-IOV functions, which just have FFFF */ |
| 607 | p_setw(perm, PCI_VENDOR_ID, (u16)ALL_VIRT, NO_WRITE); |
| 608 | p_setw(perm, PCI_DEVICE_ID, (u16)ALL_VIRT, NO_WRITE); |
| 609 | |
| 610 | /* |
| 611 | * Virtualize INTx disable, we use it internally for interrupt |
| 612 | * control and can emulate it for non-PCI 2.3 devices. |
| 613 | */ |
| 614 | p_setw(perm, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE, (u16)ALL_WRITE); |
| 615 | |
| 616 | /* Virtualize capability list, we might want to skip/disable */ |
| 617 | p_setw(perm, PCI_STATUS, PCI_STATUS_CAP_LIST, NO_WRITE); |
| 618 | |
| 619 | /* No harm to write */ |
| 620 | p_setb(perm, PCI_CACHE_LINE_SIZE, NO_VIRT, (u8)ALL_WRITE); |
| 621 | p_setb(perm, PCI_LATENCY_TIMER, NO_VIRT, (u8)ALL_WRITE); |
| 622 | p_setb(perm, PCI_BIST, NO_VIRT, (u8)ALL_WRITE); |
| 623 | |
| 624 | /* Virtualize all bars, can't touch the real ones */ |
| 625 | p_setd(perm, PCI_BASE_ADDRESS_0, ALL_VIRT, ALL_WRITE); |
| 626 | p_setd(perm, PCI_BASE_ADDRESS_1, ALL_VIRT, ALL_WRITE); |
| 627 | p_setd(perm, PCI_BASE_ADDRESS_2, ALL_VIRT, ALL_WRITE); |
| 628 | p_setd(perm, PCI_BASE_ADDRESS_3, ALL_VIRT, ALL_WRITE); |
| 629 | p_setd(perm, PCI_BASE_ADDRESS_4, ALL_VIRT, ALL_WRITE); |
| 630 | p_setd(perm, PCI_BASE_ADDRESS_5, ALL_VIRT, ALL_WRITE); |
| 631 | p_setd(perm, PCI_ROM_ADDRESS, ALL_VIRT, ALL_WRITE); |
| 632 | |
| 633 | /* Allow us to adjust capability chain */ |
| 634 | p_setb(perm, PCI_CAPABILITY_LIST, (u8)ALL_VIRT, NO_WRITE); |
| 635 | |
| 636 | /* Sometimes used by sw, just virtualize */ |
| 637 | p_setb(perm, PCI_INTERRUPT_LINE, (u8)ALL_VIRT, (u8)ALL_WRITE); |
Frank Blaschka | 1d53a3a | 2014-11-07 09:52:22 -0700 | [diff] [blame] | 638 | |
| 639 | /* Virtualize interrupt pin to allow hiding INTx */ |
| 640 | p_setb(perm, PCI_INTERRUPT_PIN, (u8)ALL_VIRT, (u8)NO_WRITE); |
| 641 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 642 | return 0; |
| 643 | } |
| 644 | |
Alex Williamson | 2dd1194 | 2013-02-18 10:10:33 -0700 | [diff] [blame] | 645 | static int vfio_pm_config_write(struct vfio_pci_device *vdev, int pos, |
| 646 | int count, struct perm_bits *perm, |
| 647 | int offset, __le32 val) |
| 648 | { |
| 649 | count = vfio_default_config_write(vdev, pos, count, perm, offset, val); |
| 650 | if (count < 0) |
| 651 | return count; |
| 652 | |
| 653 | if (offset == PCI_PM_CTRL) { |
| 654 | pci_power_t state; |
| 655 | |
| 656 | switch (le32_to_cpu(val) & PCI_PM_CTRL_STATE_MASK) { |
| 657 | case 0: |
| 658 | state = PCI_D0; |
| 659 | break; |
| 660 | case 1: |
| 661 | state = PCI_D1; |
| 662 | break; |
| 663 | case 2: |
| 664 | state = PCI_D2; |
| 665 | break; |
| 666 | case 3: |
| 667 | state = PCI_D3hot; |
| 668 | break; |
| 669 | } |
| 670 | |
| 671 | pci_set_power_state(vdev->pdev, state); |
| 672 | } |
| 673 | |
| 674 | return count; |
| 675 | } |
| 676 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 677 | /* Permissions for the Power Management capability */ |
| 678 | static int __init init_pci_cap_pm_perm(struct perm_bits *perm) |
| 679 | { |
| 680 | if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_PM])) |
| 681 | return -ENOMEM; |
| 682 | |
Alex Williamson | 2dd1194 | 2013-02-18 10:10:33 -0700 | [diff] [blame] | 683 | perm->writefn = vfio_pm_config_write; |
| 684 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 685 | /* |
| 686 | * We always virtualize the next field so we can remove |
| 687 | * capabilities from the chain if we want to. |
| 688 | */ |
| 689 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 690 | |
| 691 | /* |
Alex Williamson | 2dd1194 | 2013-02-18 10:10:33 -0700 | [diff] [blame] | 692 | * Power management is defined *per function*, so we can let |
| 693 | * the user change power state, but we trap and initiate the |
| 694 | * change ourselves, so the state bits are read-only. |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 695 | */ |
Alex Williamson | 2dd1194 | 2013-02-18 10:10:33 -0700 | [diff] [blame] | 696 | p_setd(perm, PCI_PM_CTRL, NO_VIRT, ~PCI_PM_CTRL_STATE_MASK); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 697 | return 0; |
| 698 | } |
| 699 | |
Alex Williamson | 4e1a635 | 2015-10-27 14:53:05 -0600 | [diff] [blame] | 700 | static int vfio_vpd_config_write(struct vfio_pci_device *vdev, int pos, |
| 701 | int count, struct perm_bits *perm, |
| 702 | int offset, __le32 val) |
| 703 | { |
| 704 | struct pci_dev *pdev = vdev->pdev; |
| 705 | __le16 *paddr = (__le16 *)(vdev->vconfig + pos - offset + PCI_VPD_ADDR); |
| 706 | __le32 *pdata = (__le32 *)(vdev->vconfig + pos - offset + PCI_VPD_DATA); |
| 707 | u16 addr; |
| 708 | u32 data; |
| 709 | |
| 710 | /* |
| 711 | * Write through to emulation. If the write includes the upper byte |
| 712 | * of PCI_VPD_ADDR, then the PCI_VPD_ADDR_F bit is written and we |
| 713 | * have work to do. |
| 714 | */ |
| 715 | count = vfio_default_config_write(vdev, pos, count, perm, offset, val); |
| 716 | if (count < 0 || offset > PCI_VPD_ADDR + 1 || |
| 717 | offset + count <= PCI_VPD_ADDR + 1) |
| 718 | return count; |
| 719 | |
| 720 | addr = le16_to_cpu(*paddr); |
| 721 | |
| 722 | if (addr & PCI_VPD_ADDR_F) { |
| 723 | data = le32_to_cpu(*pdata); |
| 724 | if (pci_write_vpd(pdev, addr & ~PCI_VPD_ADDR_F, 4, &data) != 4) |
| 725 | return count; |
| 726 | } else { |
| 727 | if (pci_read_vpd(pdev, addr, 4, &data) != 4) |
| 728 | return count; |
| 729 | *pdata = cpu_to_le32(data); |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * Toggle PCI_VPD_ADDR_F in the emulated PCI_VPD_ADDR register to |
| 734 | * signal completion. If an error occurs above, we assume that not |
| 735 | * toggling this bit will induce a driver timeout. |
| 736 | */ |
| 737 | addr ^= PCI_VPD_ADDR_F; |
| 738 | *paddr = cpu_to_le16(addr); |
| 739 | |
| 740 | return count; |
| 741 | } |
| 742 | |
| 743 | /* Permissions for Vital Product Data capability */ |
| 744 | static int __init init_pci_cap_vpd_perm(struct perm_bits *perm) |
| 745 | { |
| 746 | if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_VPD])) |
| 747 | return -ENOMEM; |
| 748 | |
| 749 | perm->writefn = vfio_vpd_config_write; |
| 750 | |
| 751 | /* |
| 752 | * We always virtualize the next field so we can remove |
| 753 | * capabilities from the chain if we want to. |
| 754 | */ |
| 755 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 756 | |
| 757 | /* |
| 758 | * Both the address and data registers are virtualized to |
| 759 | * enable access through the pci_vpd_read/write functions |
| 760 | */ |
| 761 | p_setw(perm, PCI_VPD_ADDR, (u16)ALL_VIRT, (u16)ALL_WRITE); |
| 762 | p_setd(perm, PCI_VPD_DATA, ALL_VIRT, ALL_WRITE); |
| 763 | |
| 764 | return 0; |
| 765 | } |
| 766 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 767 | /* Permissions for PCI-X capability */ |
| 768 | static int __init init_pci_cap_pcix_perm(struct perm_bits *perm) |
| 769 | { |
| 770 | /* Alloc 24, but only 8 are used in v0 */ |
| 771 | if (alloc_perm_bits(perm, PCI_CAP_PCIX_SIZEOF_V2)) |
| 772 | return -ENOMEM; |
| 773 | |
| 774 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 775 | |
| 776 | p_setw(perm, PCI_X_CMD, NO_VIRT, (u16)ALL_WRITE); |
| 777 | p_setd(perm, PCI_X_ECC_CSR, NO_VIRT, ALL_WRITE); |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | /* Permissions for PCI Express capability */ |
| 782 | static int __init init_pci_cap_exp_perm(struct perm_bits *perm) |
| 783 | { |
| 784 | /* Alloc larger of two possible sizes */ |
| 785 | if (alloc_perm_bits(perm, PCI_CAP_EXP_ENDPOINT_SIZEOF_V2)) |
| 786 | return -ENOMEM; |
| 787 | |
| 788 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 789 | |
| 790 | /* |
| 791 | * Allow writes to device control fields (includes FLR!) |
| 792 | * but not to devctl_phantom which could confuse IOMMU |
| 793 | * or to the ARI bit in devctl2 which is set at probe time |
| 794 | */ |
| 795 | p_setw(perm, PCI_EXP_DEVCTL, NO_VIRT, ~PCI_EXP_DEVCTL_PHANTOM); |
| 796 | p_setw(perm, PCI_EXP_DEVCTL2, NO_VIRT, ~PCI_EXP_DEVCTL2_ARI); |
| 797 | return 0; |
| 798 | } |
| 799 | |
| 800 | /* Permissions for Advanced Function capability */ |
| 801 | static int __init init_pci_cap_af_perm(struct perm_bits *perm) |
| 802 | { |
| 803 | if (alloc_perm_bits(perm, pci_cap_length[PCI_CAP_ID_AF])) |
| 804 | return -ENOMEM; |
| 805 | |
| 806 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 807 | p_setb(perm, PCI_AF_CTRL, NO_VIRT, PCI_AF_CTRL_FLR); |
| 808 | return 0; |
| 809 | } |
| 810 | |
| 811 | /* Permissions for Advanced Error Reporting extended capability */ |
| 812 | static int __init init_pci_ext_cap_err_perm(struct perm_bits *perm) |
| 813 | { |
| 814 | u32 mask; |
| 815 | |
| 816 | if (alloc_perm_bits(perm, pci_ext_cap_length[PCI_EXT_CAP_ID_ERR])) |
| 817 | return -ENOMEM; |
| 818 | |
| 819 | /* |
| 820 | * Virtualize the first dword of all express capabilities |
| 821 | * because it includes the next pointer. This lets us later |
| 822 | * remove capabilities from the chain if we need to. |
| 823 | */ |
| 824 | p_setd(perm, 0, ALL_VIRT, NO_WRITE); |
| 825 | |
| 826 | /* Writable bits mask */ |
Chen, Gong | 846fc70 | 2014-08-13 02:22:40 -0400 | [diff] [blame] | 827 | mask = PCI_ERR_UNC_UND | /* Undefined */ |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 828 | PCI_ERR_UNC_DLP | /* Data Link Protocol */ |
| 829 | PCI_ERR_UNC_SURPDN | /* Surprise Down */ |
| 830 | PCI_ERR_UNC_POISON_TLP | /* Poisoned TLP */ |
| 831 | PCI_ERR_UNC_FCP | /* Flow Control Protocol */ |
| 832 | PCI_ERR_UNC_COMP_TIME | /* Completion Timeout */ |
| 833 | PCI_ERR_UNC_COMP_ABORT | /* Completer Abort */ |
| 834 | PCI_ERR_UNC_UNX_COMP | /* Unexpected Completion */ |
| 835 | PCI_ERR_UNC_RX_OVER | /* Receiver Overflow */ |
| 836 | PCI_ERR_UNC_MALF_TLP | /* Malformed TLP */ |
| 837 | PCI_ERR_UNC_ECRC | /* ECRC Error Status */ |
| 838 | PCI_ERR_UNC_UNSUP | /* Unsupported Request */ |
| 839 | PCI_ERR_UNC_ACSV | /* ACS Violation */ |
| 840 | PCI_ERR_UNC_INTN | /* internal error */ |
| 841 | PCI_ERR_UNC_MCBTLP | /* MC blocked TLP */ |
| 842 | PCI_ERR_UNC_ATOMEG | /* Atomic egress blocked */ |
| 843 | PCI_ERR_UNC_TLPPRE; /* TLP prefix blocked */ |
| 844 | p_setd(perm, PCI_ERR_UNCOR_STATUS, NO_VIRT, mask); |
| 845 | p_setd(perm, PCI_ERR_UNCOR_MASK, NO_VIRT, mask); |
| 846 | p_setd(perm, PCI_ERR_UNCOR_SEVER, NO_VIRT, mask); |
| 847 | |
| 848 | mask = PCI_ERR_COR_RCVR | /* Receiver Error Status */ |
| 849 | PCI_ERR_COR_BAD_TLP | /* Bad TLP Status */ |
| 850 | PCI_ERR_COR_BAD_DLLP | /* Bad DLLP Status */ |
| 851 | PCI_ERR_COR_REP_ROLL | /* REPLAY_NUM Rollover */ |
| 852 | PCI_ERR_COR_REP_TIMER | /* Replay Timer Timeout */ |
| 853 | PCI_ERR_COR_ADV_NFAT | /* Advisory Non-Fatal */ |
| 854 | PCI_ERR_COR_INTERNAL | /* Corrected Internal */ |
| 855 | PCI_ERR_COR_LOG_OVER; /* Header Log Overflow */ |
| 856 | p_setd(perm, PCI_ERR_COR_STATUS, NO_VIRT, mask); |
| 857 | p_setd(perm, PCI_ERR_COR_MASK, NO_VIRT, mask); |
| 858 | |
| 859 | mask = PCI_ERR_CAP_ECRC_GENE | /* ECRC Generation Enable */ |
| 860 | PCI_ERR_CAP_ECRC_CHKE; /* ECRC Check Enable */ |
| 861 | p_setd(perm, PCI_ERR_CAP, NO_VIRT, mask); |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | /* Permissions for Power Budgeting extended capability */ |
| 866 | static int __init init_pci_ext_cap_pwr_perm(struct perm_bits *perm) |
| 867 | { |
| 868 | if (alloc_perm_bits(perm, pci_ext_cap_length[PCI_EXT_CAP_ID_PWR])) |
| 869 | return -ENOMEM; |
| 870 | |
| 871 | p_setd(perm, 0, ALL_VIRT, NO_WRITE); |
| 872 | |
| 873 | /* Writing the data selector is OK, the info is still read-only */ |
| 874 | p_setb(perm, PCI_PWR_DATA, NO_VIRT, (u8)ALL_WRITE); |
| 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | /* |
| 879 | * Initialize the shared permission tables |
| 880 | */ |
| 881 | void vfio_pci_uninit_perm_bits(void) |
| 882 | { |
| 883 | free_perm_bits(&cap_perms[PCI_CAP_ID_BASIC]); |
| 884 | |
| 885 | free_perm_bits(&cap_perms[PCI_CAP_ID_PM]); |
Alex Williamson | 4e1a635 | 2015-10-27 14:53:05 -0600 | [diff] [blame] | 886 | free_perm_bits(&cap_perms[PCI_CAP_ID_VPD]); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 887 | free_perm_bits(&cap_perms[PCI_CAP_ID_PCIX]); |
| 888 | free_perm_bits(&cap_perms[PCI_CAP_ID_EXP]); |
| 889 | free_perm_bits(&cap_perms[PCI_CAP_ID_AF]); |
| 890 | |
| 891 | free_perm_bits(&ecap_perms[PCI_EXT_CAP_ID_ERR]); |
| 892 | free_perm_bits(&ecap_perms[PCI_EXT_CAP_ID_PWR]); |
| 893 | } |
| 894 | |
| 895 | int __init vfio_pci_init_perm_bits(void) |
| 896 | { |
| 897 | int ret; |
| 898 | |
| 899 | /* Basic config space */ |
| 900 | ret = init_pci_cap_basic_perm(&cap_perms[PCI_CAP_ID_BASIC]); |
| 901 | |
| 902 | /* Capabilities */ |
| 903 | ret |= init_pci_cap_pm_perm(&cap_perms[PCI_CAP_ID_PM]); |
Alex Williamson | 4e1a635 | 2015-10-27 14:53:05 -0600 | [diff] [blame] | 904 | ret |= init_pci_cap_vpd_perm(&cap_perms[PCI_CAP_ID_VPD]); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 905 | ret |= init_pci_cap_pcix_perm(&cap_perms[PCI_CAP_ID_PCIX]); |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 906 | cap_perms[PCI_CAP_ID_VNDR].writefn = vfio_raw_config_write; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 907 | ret |= init_pci_cap_exp_perm(&cap_perms[PCI_CAP_ID_EXP]); |
| 908 | ret |= init_pci_cap_af_perm(&cap_perms[PCI_CAP_ID_AF]); |
| 909 | |
| 910 | /* Extended capabilities */ |
| 911 | ret |= init_pci_ext_cap_err_perm(&ecap_perms[PCI_EXT_CAP_ID_ERR]); |
| 912 | ret |= init_pci_ext_cap_pwr_perm(&ecap_perms[PCI_EXT_CAP_ID_PWR]); |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 913 | ecap_perms[PCI_EXT_CAP_ID_VNDR].writefn = vfio_raw_config_write; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 914 | |
| 915 | if (ret) |
| 916 | vfio_pci_uninit_perm_bits(); |
| 917 | |
| 918 | return ret; |
| 919 | } |
| 920 | |
| 921 | static int vfio_find_cap_start(struct vfio_pci_device *vdev, int pos) |
| 922 | { |
| 923 | u8 cap; |
| 924 | int base = (pos >= PCI_CFG_SPACE_SIZE) ? PCI_CFG_SPACE_SIZE : |
| 925 | PCI_STD_HEADER_SIZEOF; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 926 | cap = vdev->pci_config_map[pos]; |
| 927 | |
| 928 | if (cap == PCI_CAP_ID_BASIC) |
| 929 | return 0; |
| 930 | |
| 931 | /* XXX Can we have to abutting capabilities of the same type? */ |
| 932 | while (pos - 1 >= base && vdev->pci_config_map[pos - 1] == cap) |
| 933 | pos--; |
| 934 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 935 | return pos; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 936 | } |
| 937 | |
| 938 | static int vfio_msi_config_read(struct vfio_pci_device *vdev, int pos, |
| 939 | int count, struct perm_bits *perm, |
| 940 | int offset, __le32 *val) |
| 941 | { |
| 942 | /* Update max available queue size from msi_qmax */ |
| 943 | if (offset <= PCI_MSI_FLAGS && offset + count >= PCI_MSI_FLAGS) { |
| 944 | __le16 *flags; |
| 945 | int start; |
| 946 | |
| 947 | start = vfio_find_cap_start(vdev, pos); |
| 948 | |
| 949 | flags = (__le16 *)&vdev->vconfig[start]; |
| 950 | |
| 951 | *flags &= cpu_to_le16(~PCI_MSI_FLAGS_QMASK); |
| 952 | *flags |= cpu_to_le16(vdev->msi_qmax << 1); |
| 953 | } |
| 954 | |
| 955 | return vfio_default_config_read(vdev, pos, count, perm, offset, val); |
| 956 | } |
| 957 | |
| 958 | static int vfio_msi_config_write(struct vfio_pci_device *vdev, int pos, |
| 959 | int count, struct perm_bits *perm, |
| 960 | int offset, __le32 val) |
| 961 | { |
| 962 | count = vfio_default_config_write(vdev, pos, count, perm, offset, val); |
| 963 | if (count < 0) |
| 964 | return count; |
| 965 | |
| 966 | /* Fixup and write configured queue size and enable to hardware */ |
| 967 | if (offset <= PCI_MSI_FLAGS && offset + count >= PCI_MSI_FLAGS) { |
| 968 | __le16 *pflags; |
| 969 | u16 flags; |
| 970 | int start, ret; |
| 971 | |
| 972 | start = vfio_find_cap_start(vdev, pos); |
| 973 | |
| 974 | pflags = (__le16 *)&vdev->vconfig[start + PCI_MSI_FLAGS]; |
| 975 | |
| 976 | flags = le16_to_cpu(*pflags); |
| 977 | |
| 978 | /* MSI is enabled via ioctl */ |
| 979 | if (!is_msi(vdev)) |
| 980 | flags &= ~PCI_MSI_FLAGS_ENABLE; |
| 981 | |
| 982 | /* Check queue size */ |
| 983 | if ((flags & PCI_MSI_FLAGS_QSIZE) >> 4 > vdev->msi_qmax) { |
| 984 | flags &= ~PCI_MSI_FLAGS_QSIZE; |
| 985 | flags |= vdev->msi_qmax << 4; |
| 986 | } |
| 987 | |
| 988 | /* Write back to virt and to hardware */ |
| 989 | *pflags = cpu_to_le16(flags); |
| 990 | ret = pci_user_write_config_word(vdev->pdev, |
| 991 | start + PCI_MSI_FLAGS, |
| 992 | flags); |
| 993 | if (ret) |
| 994 | return pcibios_err_to_errno(ret); |
| 995 | } |
| 996 | |
| 997 | return count; |
| 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * MSI determination is per-device, so this routine gets used beyond |
| 1002 | * initialization time. Don't add __init |
| 1003 | */ |
| 1004 | static int init_pci_cap_msi_perm(struct perm_bits *perm, int len, u16 flags) |
| 1005 | { |
| 1006 | if (alloc_perm_bits(perm, len)) |
| 1007 | return -ENOMEM; |
| 1008 | |
| 1009 | perm->readfn = vfio_msi_config_read; |
| 1010 | perm->writefn = vfio_msi_config_write; |
| 1011 | |
| 1012 | p_setb(perm, PCI_CAP_LIST_NEXT, (u8)ALL_VIRT, NO_WRITE); |
| 1013 | |
| 1014 | /* |
| 1015 | * The upper byte of the control register is reserved, |
| 1016 | * just setup the lower byte. |
| 1017 | */ |
| 1018 | p_setb(perm, PCI_MSI_FLAGS, (u8)ALL_VIRT, (u8)ALL_WRITE); |
| 1019 | p_setd(perm, PCI_MSI_ADDRESS_LO, ALL_VIRT, ALL_WRITE); |
| 1020 | if (flags & PCI_MSI_FLAGS_64BIT) { |
| 1021 | p_setd(perm, PCI_MSI_ADDRESS_HI, ALL_VIRT, ALL_WRITE); |
| 1022 | p_setw(perm, PCI_MSI_DATA_64, (u16)ALL_VIRT, (u16)ALL_WRITE); |
| 1023 | if (flags & PCI_MSI_FLAGS_MASKBIT) { |
| 1024 | p_setd(perm, PCI_MSI_MASK_64, NO_VIRT, ALL_WRITE); |
| 1025 | p_setd(perm, PCI_MSI_PENDING_64, NO_VIRT, ALL_WRITE); |
| 1026 | } |
| 1027 | } else { |
| 1028 | p_setw(perm, PCI_MSI_DATA_32, (u16)ALL_VIRT, (u16)ALL_WRITE); |
| 1029 | if (flags & PCI_MSI_FLAGS_MASKBIT) { |
| 1030 | p_setd(perm, PCI_MSI_MASK_32, NO_VIRT, ALL_WRITE); |
| 1031 | p_setd(perm, PCI_MSI_PENDING_32, NO_VIRT, ALL_WRITE); |
| 1032 | } |
| 1033 | } |
| 1034 | return 0; |
| 1035 | } |
| 1036 | |
| 1037 | /* Determine MSI CAP field length; initialize msi_perms on 1st call per vdev */ |
| 1038 | static int vfio_msi_cap_len(struct vfio_pci_device *vdev, u8 pos) |
| 1039 | { |
| 1040 | struct pci_dev *pdev = vdev->pdev; |
| 1041 | int len, ret; |
| 1042 | u16 flags; |
| 1043 | |
| 1044 | ret = pci_read_config_word(pdev, pos + PCI_MSI_FLAGS, &flags); |
| 1045 | if (ret) |
| 1046 | return pcibios_err_to_errno(ret); |
| 1047 | |
| 1048 | len = 10; /* Minimum size */ |
| 1049 | if (flags & PCI_MSI_FLAGS_64BIT) |
| 1050 | len += 4; |
| 1051 | if (flags & PCI_MSI_FLAGS_MASKBIT) |
| 1052 | len += 10; |
| 1053 | |
| 1054 | if (vdev->msi_perm) |
| 1055 | return len; |
| 1056 | |
| 1057 | vdev->msi_perm = kmalloc(sizeof(struct perm_bits), GFP_KERNEL); |
| 1058 | if (!vdev->msi_perm) |
| 1059 | return -ENOMEM; |
| 1060 | |
| 1061 | ret = init_pci_cap_msi_perm(vdev->msi_perm, len, flags); |
| 1062 | if (ret) |
| 1063 | return ret; |
| 1064 | |
| 1065 | return len; |
| 1066 | } |
| 1067 | |
| 1068 | /* Determine extended capability length for VC (2 & 9) and MFVC */ |
| 1069 | static int vfio_vc_cap_len(struct vfio_pci_device *vdev, u16 pos) |
| 1070 | { |
| 1071 | struct pci_dev *pdev = vdev->pdev; |
| 1072 | u32 tmp; |
| 1073 | int ret, evcc, phases, vc_arb; |
| 1074 | int len = PCI_CAP_VC_BASE_SIZEOF; |
| 1075 | |
Alex Williamson | 274127a | 2013-12-17 16:43:57 -0700 | [diff] [blame] | 1076 | ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP1, &tmp); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1077 | if (ret) |
| 1078 | return pcibios_err_to_errno(ret); |
| 1079 | |
Alex Williamson | 274127a | 2013-12-17 16:43:57 -0700 | [diff] [blame] | 1080 | evcc = tmp & PCI_VC_CAP1_EVCC; /* extended vc count */ |
| 1081 | ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP2, &tmp); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1082 | if (ret) |
| 1083 | return pcibios_err_to_errno(ret); |
| 1084 | |
Alex Williamson | 274127a | 2013-12-17 16:43:57 -0700 | [diff] [blame] | 1085 | if (tmp & PCI_VC_CAP2_128_PHASE) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1086 | phases = 128; |
Alex Williamson | 274127a | 2013-12-17 16:43:57 -0700 | [diff] [blame] | 1087 | else if (tmp & PCI_VC_CAP2_64_PHASE) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1088 | phases = 64; |
Alex Williamson | 274127a | 2013-12-17 16:43:57 -0700 | [diff] [blame] | 1089 | else if (tmp & PCI_VC_CAP2_32_PHASE) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1090 | phases = 32; |
| 1091 | else |
| 1092 | phases = 0; |
| 1093 | |
| 1094 | vc_arb = phases * 4; |
| 1095 | |
| 1096 | /* |
| 1097 | * Port arbitration tables are root & switch only; |
| 1098 | * function arbitration tables are function 0 only. |
| 1099 | * In either case, we'll never let user write them so |
| 1100 | * we don't care how big they are |
| 1101 | */ |
| 1102 | len += (1 + evcc) * PCI_CAP_VC_PER_VC_SIZEOF; |
| 1103 | if (vc_arb) { |
| 1104 | len = round_up(len, 16); |
| 1105 | len += vc_arb / 8; |
| 1106 | } |
| 1107 | return len; |
| 1108 | } |
| 1109 | |
| 1110 | static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos) |
| 1111 | { |
| 1112 | struct pci_dev *pdev = vdev->pdev; |
Alex Williamson | 17638db | 2013-09-04 10:58:52 -0600 | [diff] [blame] | 1113 | u32 dword; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1114 | u16 word; |
| 1115 | u8 byte; |
| 1116 | int ret; |
| 1117 | |
| 1118 | switch (cap) { |
| 1119 | case PCI_CAP_ID_MSI: |
| 1120 | return vfio_msi_cap_len(vdev, pos); |
| 1121 | case PCI_CAP_ID_PCIX: |
| 1122 | ret = pci_read_config_word(pdev, pos + PCI_X_CMD, &word); |
| 1123 | if (ret) |
| 1124 | return pcibios_err_to_errno(ret); |
| 1125 | |
| 1126 | if (PCI_X_CMD_VERSION(word)) { |
Alex Williamson | 17638db | 2013-09-04 10:58:52 -0600 | [diff] [blame] | 1127 | /* Test for extended capabilities */ |
| 1128 | pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword); |
| 1129 | vdev->extended_caps = (dword != 0); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1130 | return PCI_CAP_PCIX_SIZEOF_V2; |
| 1131 | } else |
| 1132 | return PCI_CAP_PCIX_SIZEOF_V0; |
| 1133 | case PCI_CAP_ID_VNDR: |
| 1134 | /* length follows next field */ |
| 1135 | ret = pci_read_config_byte(pdev, pos + PCI_CAP_FLAGS, &byte); |
| 1136 | if (ret) |
| 1137 | return pcibios_err_to_errno(ret); |
| 1138 | |
| 1139 | return byte; |
| 1140 | case PCI_CAP_ID_EXP: |
Alex Williamson | 17638db | 2013-09-04 10:58:52 -0600 | [diff] [blame] | 1141 | /* Test for extended capabilities */ |
| 1142 | pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword); |
| 1143 | vdev->extended_caps = (dword != 0); |
Alex Williamson | 5641ade | 2013-02-14 10:45:31 -0700 | [diff] [blame] | 1144 | |
Alex Williamson | 17638db | 2013-09-04 10:58:52 -0600 | [diff] [blame] | 1145 | /* length based on version */ |
Yijing Wang | aa2cba5 | 2013-04-15 08:45:10 -0600 | [diff] [blame] | 1146 | if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1147 | return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1; |
Alex Williamson | 5641ade | 2013-02-14 10:45:31 -0700 | [diff] [blame] | 1148 | else |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1149 | return PCI_CAP_EXP_ENDPOINT_SIZEOF_V2; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1150 | case PCI_CAP_ID_HT: |
| 1151 | ret = pci_read_config_byte(pdev, pos + 3, &byte); |
| 1152 | if (ret) |
| 1153 | return pcibios_err_to_errno(ret); |
| 1154 | |
| 1155 | return (byte & HT_3BIT_CAP_MASK) ? |
| 1156 | HT_CAP_SIZEOF_SHORT : HT_CAP_SIZEOF_LONG; |
| 1157 | case PCI_CAP_ID_SATA: |
| 1158 | ret = pci_read_config_byte(pdev, pos + PCI_SATA_REGS, &byte); |
| 1159 | if (ret) |
| 1160 | return pcibios_err_to_errno(ret); |
| 1161 | |
| 1162 | byte &= PCI_SATA_REGS_MASK; |
| 1163 | if (byte == PCI_SATA_REGS_INLINE) |
| 1164 | return PCI_SATA_SIZEOF_LONG; |
| 1165 | else |
| 1166 | return PCI_SATA_SIZEOF_SHORT; |
| 1167 | default: |
| 1168 | pr_warn("%s: %s unknown length for pci cap 0x%x@0x%x\n", |
| 1169 | dev_name(&pdev->dev), __func__, cap, pos); |
| 1170 | } |
| 1171 | |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | static int vfio_ext_cap_len(struct vfio_pci_device *vdev, u16 ecap, u16 epos) |
| 1176 | { |
| 1177 | struct pci_dev *pdev = vdev->pdev; |
| 1178 | u8 byte; |
| 1179 | u32 dword; |
| 1180 | int ret; |
| 1181 | |
| 1182 | switch (ecap) { |
| 1183 | case PCI_EXT_CAP_ID_VNDR: |
| 1184 | ret = pci_read_config_dword(pdev, epos + PCI_VSEC_HDR, &dword); |
| 1185 | if (ret) |
| 1186 | return pcibios_err_to_errno(ret); |
| 1187 | |
| 1188 | return dword >> PCI_VSEC_HDR_LEN_SHIFT; |
| 1189 | case PCI_EXT_CAP_ID_VC: |
| 1190 | case PCI_EXT_CAP_ID_VC9: |
| 1191 | case PCI_EXT_CAP_ID_MFVC: |
| 1192 | return vfio_vc_cap_len(vdev, epos); |
| 1193 | case PCI_EXT_CAP_ID_ACS: |
| 1194 | ret = pci_read_config_byte(pdev, epos + PCI_ACS_CAP, &byte); |
| 1195 | if (ret) |
| 1196 | return pcibios_err_to_errno(ret); |
| 1197 | |
| 1198 | if (byte & PCI_ACS_EC) { |
| 1199 | int bits; |
| 1200 | |
| 1201 | ret = pci_read_config_byte(pdev, |
| 1202 | epos + PCI_ACS_EGRESS_BITS, |
| 1203 | &byte); |
| 1204 | if (ret) |
| 1205 | return pcibios_err_to_errno(ret); |
| 1206 | |
| 1207 | bits = byte ? round_up(byte, 32) : 256; |
| 1208 | return 8 + (bits / 8); |
| 1209 | } |
| 1210 | return 8; |
| 1211 | |
| 1212 | case PCI_EXT_CAP_ID_REBAR: |
| 1213 | ret = pci_read_config_byte(pdev, epos + PCI_REBAR_CTRL, &byte); |
| 1214 | if (ret) |
| 1215 | return pcibios_err_to_errno(ret); |
| 1216 | |
| 1217 | byte &= PCI_REBAR_CTRL_NBAR_MASK; |
| 1218 | byte >>= PCI_REBAR_CTRL_NBAR_SHIFT; |
| 1219 | |
| 1220 | return 4 + (byte * 8); |
| 1221 | case PCI_EXT_CAP_ID_DPA: |
| 1222 | ret = pci_read_config_byte(pdev, epos + PCI_DPA_CAP, &byte); |
| 1223 | if (ret) |
| 1224 | return pcibios_err_to_errno(ret); |
| 1225 | |
| 1226 | byte &= PCI_DPA_CAP_SUBSTATE_MASK; |
Alex Williamson | afa6325 | 2014-05-30 10:50:31 -0600 | [diff] [blame] | 1227 | return PCI_DPA_BASE_SIZEOF + byte + 1; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1228 | case PCI_EXT_CAP_ID_TPH: |
| 1229 | ret = pci_read_config_dword(pdev, epos + PCI_TPH_CAP, &dword); |
| 1230 | if (ret) |
| 1231 | return pcibios_err_to_errno(ret); |
| 1232 | |
| 1233 | if ((dword & PCI_TPH_CAP_LOC_MASK) == PCI_TPH_LOC_CAP) { |
| 1234 | int sts; |
| 1235 | |
Alex Williamson | afa6325 | 2014-05-30 10:50:31 -0600 | [diff] [blame] | 1236 | sts = dword & PCI_TPH_CAP_ST_MASK; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1237 | sts >>= PCI_TPH_CAP_ST_SHIFT; |
Alex Williamson | afa6325 | 2014-05-30 10:50:31 -0600 | [diff] [blame] | 1238 | return PCI_TPH_BASE_SIZEOF + (sts * 2) + 2; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1239 | } |
| 1240 | return PCI_TPH_BASE_SIZEOF; |
| 1241 | default: |
| 1242 | pr_warn("%s: %s unknown length for pci ecap 0x%x@0x%x\n", |
| 1243 | dev_name(&pdev->dev), __func__, ecap, epos); |
| 1244 | } |
| 1245 | |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | static int vfio_fill_vconfig_bytes(struct vfio_pci_device *vdev, |
| 1250 | int offset, int size) |
| 1251 | { |
| 1252 | struct pci_dev *pdev = vdev->pdev; |
| 1253 | int ret = 0; |
| 1254 | |
| 1255 | /* |
| 1256 | * We try to read physical config space in the largest chunks |
| 1257 | * we can, assuming that all of the fields support dword access. |
| 1258 | * pci_save_state() makes this same assumption and seems to do ok. |
| 1259 | */ |
| 1260 | while (size) { |
| 1261 | int filled; |
| 1262 | |
| 1263 | if (size >= 4 && !(offset % 4)) { |
| 1264 | __le32 *dwordp = (__le32 *)&vdev->vconfig[offset]; |
| 1265 | u32 dword; |
| 1266 | |
| 1267 | ret = pci_read_config_dword(pdev, offset, &dword); |
| 1268 | if (ret) |
| 1269 | return ret; |
| 1270 | *dwordp = cpu_to_le32(dword); |
| 1271 | filled = 4; |
| 1272 | } else if (size >= 2 && !(offset % 2)) { |
| 1273 | __le16 *wordp = (__le16 *)&vdev->vconfig[offset]; |
| 1274 | u16 word; |
| 1275 | |
| 1276 | ret = pci_read_config_word(pdev, offset, &word); |
| 1277 | if (ret) |
| 1278 | return ret; |
| 1279 | *wordp = cpu_to_le16(word); |
| 1280 | filled = 2; |
| 1281 | } else { |
| 1282 | u8 *byte = &vdev->vconfig[offset]; |
| 1283 | ret = pci_read_config_byte(pdev, offset, byte); |
| 1284 | if (ret) |
| 1285 | return ret; |
| 1286 | filled = 1; |
| 1287 | } |
| 1288 | |
| 1289 | offset += filled; |
| 1290 | size -= filled; |
| 1291 | } |
| 1292 | |
| 1293 | return ret; |
| 1294 | } |
| 1295 | |
| 1296 | static int vfio_cap_init(struct vfio_pci_device *vdev) |
| 1297 | { |
| 1298 | struct pci_dev *pdev = vdev->pdev; |
| 1299 | u8 *map = vdev->pci_config_map; |
| 1300 | u16 status; |
| 1301 | u8 pos, *prev, cap; |
| 1302 | int loops, ret, caps = 0; |
| 1303 | |
| 1304 | /* Any capabilities? */ |
| 1305 | ret = pci_read_config_word(pdev, PCI_STATUS, &status); |
| 1306 | if (ret) |
| 1307 | return ret; |
| 1308 | |
| 1309 | if (!(status & PCI_STATUS_CAP_LIST)) |
| 1310 | return 0; /* Done */ |
| 1311 | |
| 1312 | ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos); |
| 1313 | if (ret) |
| 1314 | return ret; |
| 1315 | |
| 1316 | /* Mark the previous position in case we want to skip a capability */ |
| 1317 | prev = &vdev->vconfig[PCI_CAPABILITY_LIST]; |
| 1318 | |
| 1319 | /* We can bound our loop, capabilities are dword aligned */ |
| 1320 | loops = (PCI_CFG_SPACE_SIZE - PCI_STD_HEADER_SIZEOF) / PCI_CAP_SIZEOF; |
| 1321 | while (pos && loops--) { |
| 1322 | u8 next; |
| 1323 | int i, len = 0; |
| 1324 | |
| 1325 | ret = pci_read_config_byte(pdev, pos, &cap); |
| 1326 | if (ret) |
| 1327 | return ret; |
| 1328 | |
| 1329 | ret = pci_read_config_byte(pdev, |
| 1330 | pos + PCI_CAP_LIST_NEXT, &next); |
| 1331 | if (ret) |
| 1332 | return ret; |
| 1333 | |
| 1334 | if (cap <= PCI_CAP_ID_MAX) { |
| 1335 | len = pci_cap_length[cap]; |
| 1336 | if (len == 0xFF) { /* Variable length */ |
| 1337 | len = vfio_cap_len(vdev, cap, pos); |
| 1338 | if (len < 0) |
| 1339 | return len; |
| 1340 | } |
| 1341 | } |
| 1342 | |
| 1343 | if (!len) { |
| 1344 | pr_info("%s: %s hiding cap 0x%x\n", |
| 1345 | __func__, dev_name(&pdev->dev), cap); |
| 1346 | *prev = next; |
| 1347 | pos = next; |
| 1348 | continue; |
| 1349 | } |
| 1350 | |
| 1351 | /* Sanity check, do we overlap other capabilities? */ |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1352 | for (i = 0; i < len; i++) { |
| 1353 | if (likely(map[pos + i] == PCI_CAP_ID_INVALID)) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1354 | continue; |
| 1355 | |
| 1356 | pr_warn("%s: %s pci config conflict @0x%x, was cap 0x%x now cap 0x%x\n", |
| 1357 | __func__, dev_name(&pdev->dev), |
| 1358 | pos + i, map[pos + i], cap); |
| 1359 | } |
| 1360 | |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 1361 | BUILD_BUG_ON(PCI_CAP_ID_MAX >= PCI_CAP_ID_INVALID_VIRT); |
| 1362 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1363 | memset(map + pos, cap, len); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1364 | ret = vfio_fill_vconfig_bytes(vdev, pos, len); |
| 1365 | if (ret) |
| 1366 | return ret; |
| 1367 | |
| 1368 | prev = &vdev->vconfig[pos + PCI_CAP_LIST_NEXT]; |
| 1369 | pos = next; |
| 1370 | caps++; |
| 1371 | } |
| 1372 | |
| 1373 | /* If we didn't fill any capabilities, clear the status flag */ |
| 1374 | if (!caps) { |
| 1375 | __le16 *vstatus = (__le16 *)&vdev->vconfig[PCI_STATUS]; |
| 1376 | *vstatus &= ~cpu_to_le16(PCI_STATUS_CAP_LIST); |
| 1377 | } |
| 1378 | |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | static int vfio_ecap_init(struct vfio_pci_device *vdev) |
| 1383 | { |
| 1384 | struct pci_dev *pdev = vdev->pdev; |
| 1385 | u8 *map = vdev->pci_config_map; |
| 1386 | u16 epos; |
| 1387 | __le32 *prev = NULL; |
| 1388 | int loops, ret, ecaps = 0; |
| 1389 | |
| 1390 | if (!vdev->extended_caps) |
| 1391 | return 0; |
| 1392 | |
| 1393 | epos = PCI_CFG_SPACE_SIZE; |
| 1394 | |
| 1395 | loops = (pdev->cfg_size - PCI_CFG_SPACE_SIZE) / PCI_CAP_SIZEOF; |
| 1396 | |
| 1397 | while (loops-- && epos >= PCI_CFG_SPACE_SIZE) { |
| 1398 | u32 header; |
| 1399 | u16 ecap; |
| 1400 | int i, len = 0; |
| 1401 | bool hidden = false; |
| 1402 | |
| 1403 | ret = pci_read_config_dword(pdev, epos, &header); |
| 1404 | if (ret) |
| 1405 | return ret; |
| 1406 | |
| 1407 | ecap = PCI_EXT_CAP_ID(header); |
| 1408 | |
| 1409 | if (ecap <= PCI_EXT_CAP_ID_MAX) { |
| 1410 | len = pci_ext_cap_length[ecap]; |
| 1411 | if (len == 0xFF) { |
| 1412 | len = vfio_ext_cap_len(vdev, ecap, epos); |
| 1413 | if (len < 0) |
| 1414 | return ret; |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | if (!len) { |
| 1419 | pr_info("%s: %s hiding ecap 0x%x@0x%x\n", |
| 1420 | __func__, dev_name(&pdev->dev), ecap, epos); |
| 1421 | |
| 1422 | /* If not the first in the chain, we can skip over it */ |
| 1423 | if (prev) { |
| 1424 | u32 val = epos = PCI_EXT_CAP_NEXT(header); |
| 1425 | *prev &= cpu_to_le32(~(0xffcU << 20)); |
| 1426 | *prev |= cpu_to_le32(val << 20); |
| 1427 | continue; |
| 1428 | } |
| 1429 | |
| 1430 | /* |
| 1431 | * Otherwise, fill in a placeholder, the direct |
| 1432 | * readfn will virtualize this automatically |
| 1433 | */ |
| 1434 | len = PCI_CAP_SIZEOF; |
| 1435 | hidden = true; |
| 1436 | } |
| 1437 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1438 | for (i = 0; i < len; i++) { |
| 1439 | if (likely(map[epos + i] == PCI_CAP_ID_INVALID)) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1440 | continue; |
| 1441 | |
| 1442 | pr_warn("%s: %s pci config conflict @0x%x, was ecap 0x%x now ecap 0x%x\n", |
| 1443 | __func__, dev_name(&pdev->dev), |
| 1444 | epos + i, map[epos + i], ecap); |
| 1445 | } |
| 1446 | |
| 1447 | /* |
| 1448 | * Even though ecap is 2 bytes, we're currently a long way |
| 1449 | * from exceeding 1 byte capabilities. If we ever make it |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 1450 | * up to 0xFE we'll need to up this to a two-byte, byte map. |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1451 | */ |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 1452 | BUILD_BUG_ON(PCI_EXT_CAP_ID_MAX >= PCI_CAP_ID_INVALID_VIRT); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1453 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1454 | memset(map + epos, ecap, len); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1455 | ret = vfio_fill_vconfig_bytes(vdev, epos, len); |
| 1456 | if (ret) |
| 1457 | return ret; |
| 1458 | |
| 1459 | /* |
| 1460 | * If we're just using this capability to anchor the list, |
| 1461 | * hide the real ID. Only count real ecaps. XXX PCI spec |
| 1462 | * indicates to use cap id = 0, version = 0, next = 0 if |
| 1463 | * ecaps are absent, hope users check all the way to next. |
| 1464 | */ |
| 1465 | if (hidden) |
| 1466 | *(__le32 *)&vdev->vconfig[epos] &= |
| 1467 | cpu_to_le32((0xffcU << 20)); |
| 1468 | else |
| 1469 | ecaps++; |
| 1470 | |
| 1471 | prev = (__le32 *)&vdev->vconfig[epos]; |
| 1472 | epos = PCI_EXT_CAP_NEXT(header); |
| 1473 | } |
| 1474 | |
| 1475 | if (!ecaps) |
| 1476 | *(u32 *)&vdev->vconfig[PCI_CFG_SPACE_SIZE] = 0; |
| 1477 | |
| 1478 | return 0; |
| 1479 | } |
| 1480 | |
| 1481 | /* |
| 1482 | * For each device we allocate a pci_config_map that indicates the |
| 1483 | * capability occupying each dword and thus the struct perm_bits we |
| 1484 | * use for read and write. We also allocate a virtualized config |
| 1485 | * space which tracks reads and writes to bits that we emulate for |
| 1486 | * the user. Initial values filled from device. |
| 1487 | * |
| 1488 | * Using shared stuct perm_bits between all vfio-pci devices saves |
| 1489 | * us from allocating cfg_size buffers for virt and write for every |
| 1490 | * device. We could remove vconfig and allocate individual buffers |
| 1491 | * for each area requring emulated bits, but the array of pointers |
| 1492 | * would be comparable in size (at least for standard config space). |
| 1493 | */ |
| 1494 | int vfio_config_init(struct vfio_pci_device *vdev) |
| 1495 | { |
| 1496 | struct pci_dev *pdev = vdev->pdev; |
| 1497 | u8 *map, *vconfig; |
| 1498 | int ret; |
| 1499 | |
| 1500 | /* |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1501 | * Config space, caps and ecaps are all dword aligned, so we could |
| 1502 | * use one byte per dword to record the type. However, there are |
| 1503 | * no requiremenst on the length of a capability, so the gap between |
| 1504 | * capabilities needs byte granularity. |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1505 | */ |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1506 | map = kmalloc(pdev->cfg_size, GFP_KERNEL); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1507 | if (!map) |
| 1508 | return -ENOMEM; |
| 1509 | |
| 1510 | vconfig = kmalloc(pdev->cfg_size, GFP_KERNEL); |
| 1511 | if (!vconfig) { |
| 1512 | kfree(map); |
| 1513 | return -ENOMEM; |
| 1514 | } |
| 1515 | |
| 1516 | vdev->pci_config_map = map; |
| 1517 | vdev->vconfig = vconfig; |
| 1518 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1519 | memset(map, PCI_CAP_ID_BASIC, PCI_STD_HEADER_SIZEOF); |
| 1520 | memset(map + PCI_STD_HEADER_SIZEOF, PCI_CAP_ID_INVALID, |
| 1521 | pdev->cfg_size - PCI_STD_HEADER_SIZEOF); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1522 | |
| 1523 | ret = vfio_fill_vconfig_bytes(vdev, 0, PCI_STD_HEADER_SIZEOF); |
| 1524 | if (ret) |
| 1525 | goto out; |
| 1526 | |
| 1527 | vdev->bardirty = true; |
| 1528 | |
| 1529 | /* |
| 1530 | * XXX can we just pci_load_saved_state/pci_restore_state? |
| 1531 | * may need to rebuild vconfig after that |
| 1532 | */ |
| 1533 | |
| 1534 | /* For restore after reset */ |
| 1535 | vdev->rbar[0] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_0]); |
| 1536 | vdev->rbar[1] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_1]); |
| 1537 | vdev->rbar[2] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_2]); |
| 1538 | vdev->rbar[3] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_3]); |
| 1539 | vdev->rbar[4] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_4]); |
| 1540 | vdev->rbar[5] = le32_to_cpu(*(__le32 *)&vconfig[PCI_BASE_ADDRESS_5]); |
| 1541 | vdev->rbar[6] = le32_to_cpu(*(__le32 *)&vconfig[PCI_ROM_ADDRESS]); |
| 1542 | |
| 1543 | if (pdev->is_virtfn) { |
| 1544 | *(__le16 *)&vconfig[PCI_VENDOR_ID] = cpu_to_le16(pdev->vendor); |
| 1545 | *(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device); |
| 1546 | } |
| 1547 | |
Frank Blaschka | 1d53a3a | 2014-11-07 09:52:22 -0700 | [diff] [blame] | 1548 | if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX)) |
| 1549 | vconfig[PCI_INTERRUPT_PIN] = 0; |
| 1550 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1551 | ret = vfio_cap_init(vdev); |
| 1552 | if (ret) |
| 1553 | goto out; |
| 1554 | |
| 1555 | ret = vfio_ecap_init(vdev); |
| 1556 | if (ret) |
| 1557 | goto out; |
| 1558 | |
| 1559 | return 0; |
| 1560 | |
| 1561 | out: |
| 1562 | kfree(map); |
| 1563 | vdev->pci_config_map = NULL; |
| 1564 | kfree(vconfig); |
| 1565 | vdev->vconfig = NULL; |
| 1566 | return pcibios_err_to_errno(ret); |
| 1567 | } |
| 1568 | |
| 1569 | void vfio_config_free(struct vfio_pci_device *vdev) |
| 1570 | { |
| 1571 | kfree(vdev->vconfig); |
| 1572 | vdev->vconfig = NULL; |
| 1573 | kfree(vdev->pci_config_map); |
| 1574 | vdev->pci_config_map = NULL; |
| 1575 | kfree(vdev->msi_perm); |
| 1576 | vdev->msi_perm = NULL; |
| 1577 | } |
| 1578 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1579 | /* |
| 1580 | * Find the remaining number of bytes in a dword that match the given |
| 1581 | * position. Stop at either the end of the capability or the dword boundary. |
| 1582 | */ |
| 1583 | static size_t vfio_pci_cap_remaining_dword(struct vfio_pci_device *vdev, |
| 1584 | loff_t pos) |
| 1585 | { |
| 1586 | u8 cap = vdev->pci_config_map[pos]; |
| 1587 | size_t i; |
| 1588 | |
| 1589 | for (i = 1; (pos + i) % 4 && vdev->pci_config_map[pos + i] == cap; i++) |
| 1590 | /* nop */; |
| 1591 | |
| 1592 | return i; |
| 1593 | } |
| 1594 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1595 | static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf, |
| 1596 | size_t count, loff_t *ppos, bool iswrite) |
| 1597 | { |
| 1598 | struct pci_dev *pdev = vdev->pdev; |
| 1599 | struct perm_bits *perm; |
| 1600 | __le32 val = 0; |
| 1601 | int cap_start = 0, offset; |
| 1602 | u8 cap_id; |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1603 | ssize_t ret; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1604 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1605 | if (*ppos < 0 || *ppos >= pdev->cfg_size || |
| 1606 | *ppos + count > pdev->cfg_size) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1607 | return -EFAULT; |
| 1608 | |
| 1609 | /* |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1610 | * Chop accesses into aligned chunks containing no more than a |
| 1611 | * single capability. Caller increments to the next chunk. |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1612 | */ |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1613 | count = min(count, vfio_pci_cap_remaining_dword(vdev, *ppos)); |
| 1614 | if (count >= 4 && !(*ppos % 4)) |
| 1615 | count = 4; |
| 1616 | else if (count >= 2 && !(*ppos % 2)) |
| 1617 | count = 2; |
| 1618 | else |
| 1619 | count = 1; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1620 | |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1621 | ret = count; |
| 1622 | |
| 1623 | cap_id = vdev->pci_config_map[*ppos]; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1624 | |
| 1625 | if (cap_id == PCI_CAP_ID_INVALID) { |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 1626 | perm = &unassigned_perms; |
| 1627 | cap_start = *ppos; |
Alex Williamson | 345d710 | 2016-02-22 16:02:41 -0700 | [diff] [blame] | 1628 | } else if (cap_id == PCI_CAP_ID_INVALID_VIRT) { |
| 1629 | perm = &virt_perms; |
| 1630 | cap_start = *ppos; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1631 | } else { |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 1632 | if (*ppos >= PCI_CFG_SPACE_SIZE) { |
| 1633 | WARN_ON(cap_id > PCI_EXT_CAP_ID_MAX); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1634 | |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 1635 | perm = &ecap_perms[cap_id]; |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1636 | cap_start = vfio_find_cap_start(vdev, *ppos); |
Alex Williamson | a7d1ea1 | 2013-04-01 09:04:12 -0600 | [diff] [blame] | 1637 | } else { |
| 1638 | WARN_ON(cap_id > PCI_CAP_ID_MAX); |
| 1639 | |
| 1640 | perm = &cap_perms[cap_id]; |
| 1641 | |
| 1642 | if (cap_id == PCI_CAP_ID_MSI) |
| 1643 | perm = vdev->msi_perm; |
| 1644 | |
| 1645 | if (cap_id > PCI_CAP_ID_BASIC) |
| 1646 | cap_start = vfio_find_cap_start(vdev, *ppos); |
| 1647 | } |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | WARN_ON(!cap_start && cap_id != PCI_CAP_ID_BASIC); |
| 1651 | WARN_ON(cap_start > *ppos); |
| 1652 | |
| 1653 | offset = *ppos - cap_start; |
| 1654 | |
| 1655 | if (iswrite) { |
| 1656 | if (!perm->writefn) |
| 1657 | return ret; |
| 1658 | |
| 1659 | if (copy_from_user(&val, buf, count)) |
| 1660 | return -EFAULT; |
| 1661 | |
| 1662 | ret = perm->writefn(vdev, *ppos, count, perm, offset, val); |
| 1663 | } else { |
| 1664 | if (perm->readfn) { |
| 1665 | ret = perm->readfn(vdev, *ppos, count, |
| 1666 | perm, offset, &val); |
| 1667 | if (ret < 0) |
| 1668 | return ret; |
| 1669 | } |
| 1670 | |
| 1671 | if (copy_to_user(buf, &val, count)) |
| 1672 | return -EFAULT; |
| 1673 | } |
| 1674 | |
| 1675 | return ret; |
| 1676 | } |
| 1677 | |
Alex Williamson | 906ee99 | 2013-02-14 14:02:12 -0700 | [diff] [blame] | 1678 | ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev, char __user *buf, |
| 1679 | size_t count, loff_t *ppos, bool iswrite) |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1680 | { |
| 1681 | size_t done = 0; |
| 1682 | int ret = 0; |
| 1683 | loff_t pos = *ppos; |
| 1684 | |
| 1685 | pos &= VFIO_PCI_OFFSET_MASK; |
| 1686 | |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1687 | while (count) { |
Alex Williamson | 180b138 | 2013-04-01 09:03:44 -0600 | [diff] [blame] | 1688 | ret = vfio_config_do_rw(vdev, buf, count, &pos, iswrite); |
Alex Williamson | 89e1f7d | 2012-07-31 08:16:24 -0600 | [diff] [blame] | 1689 | if (ret < 0) |
| 1690 | return ret; |
| 1691 | |
| 1692 | count -= ret; |
| 1693 | done += ret; |
| 1694 | buf += ret; |
| 1695 | pos += ret; |
| 1696 | } |
| 1697 | |
| 1698 | *ppos += done; |
| 1699 | |
| 1700 | return done; |
| 1701 | } |