include/linux/remoteproc.h

   1 /*
   2  * Remote Processor Framework
   3  *
   4  * Copyright(c) 2011 Texas Instruments, Inc.
   5  * Copyright(c) 2011 Google, Inc.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * * Redistributions of source code must retain the above copyright
  13  *   notice, this list of conditions and the following disclaimer.
  14  * * Redistributions in binary form must reproduce the above copyright
  15  *   notice, this list of conditions and the following disclaimer in
  16  *   the documentation and/or other materials provided with the
  17  *   distribution.
  18  * * Neither the name Texas Instruments nor the names of its
  19  *   contributors may be used to endorse or promote products derived
  20  *   from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #ifndef REMOTEPROC_H
  36 #define REMOTEPROC_H
  37
  38 #include <linux/types.h>
  39 #include <linux/mutex.h>
  40 #include <linux/virtio.h>
  41 #include <linux/cdev.h>
  42 #include <linux/completion.h>
  43 #include <linux/idr.h>
  44 #include <linux/of.h>
  45
  46 /**
  47  * struct resource_table - firmware resource table header
  48  * @ver: version number
  49  * @num: number of resource entries
  50  * @reserved: reserved (must be zero)
  51  * @offset: array of offsets pointing at the various resource entries
  52  *
  53  * A resource table is essentially a list of system resources required
  54  * by the remote processor. It may also include configuration entries.
  55  * If needed, the remote processor firmware should contain this table
  56  * as a dedicated ".resource_table" ELF section.
  57  *
  58  * Some resources entries are mere announcements, where the host is informed
  59  * of specific remoteproc configuration. Other entries require the host to
  60  * do something (e.g. allocate a system resource). Sometimes a negotiation
  61  * is expected, where the firmware requests a resource, and once allocated,
  62  * the host should provide back its details (e.g. address of an allocated
  63  * memory region).
  64  *
  65  * The header of the resource table, as expressed by this structure,
  66  * contains a version number (should we need to change this format in the
  67  * future), the number of available resource entries, and their offsets
  68  * in the table.
  69  *
  70  * Immediately following this header are the resource entries themselves,
  71  * each of which begins with a resource entry header (as described below).
  72  */
  73 struct resource_table {
  74         u32 ver;
  75         u32 num;
  76         u32 reserved[2];
  77         u32 offset[];
  78 } __packed;
  79
  80 /**
  81  * struct fw_rsc_hdr - firmware resource entry header
  82  * @type: resource type
  83  * @data: resource data
  84  *
  85  * Every resource entry begins with a 'struct fw_rsc_hdr' header providing
  86  * its @type. The content of the entry itself will immediately follow
  87  * this header, and it should be parsed according to the resource type.
  88  */
  89 struct fw_rsc_hdr {
  90         u32 type;
  91         u8 data[];
  92 } __packed;
  93
  94 /**
  95  * enum fw_resource_type - types of resource entries
  96  *
  97  * @RSC_CARVEOUT:   request for allocation of a physically contiguous
  98  *                  memory region.
  99  * @RSC_DEVMEM:     request to iommu_map a memory-based peripheral.
 100  * @RSC_TRACE:      announces the availability of a trace buffer into which
 101  *                  the remote processor will be writing logs.
 102  * @RSC_VDEV:       declare support for a virtio device, and serve as its
 103  *                  virtio header.
 104  * @RSC_LAST:       just keep this one at the end of standard resources
 105  * @RSC_VENDOR_START:   start of the vendor specific resource types range
 106  * @RSC_VENDOR_END:     end of the vendor specific resource types range
 107  *
 108  * For more details regarding a specific resource type, please see its
 109  * dedicated structure below.
 110  *
 111  * Please note that these values are used as indices to the rproc_handle_rsc
 112  * lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
 113  * check the validity of an index before the lookup table is accessed, so
 114  * please update it as needed.
 115  */
 116 enum fw_resource_type {
 117         RSC_CARVEOUT            = 0,
 118         RSC_DEVMEM              = 1,
 119         RSC_TRACE               = 2,
 120         RSC_VDEV                = 3,
 121         RSC_LAST                = 4,
 122         RSC_VENDOR_START        = 128,
 123         RSC_VENDOR_END          = 512,
 124 };
 125
 126 #define FW_RSC_ADDR_ANY (-1)
 127
 128 /**
 129  * struct fw_rsc_carveout - physically contiguous memory request
 130  * @da: device address
 131  * @pa: physical address
 132  * @len: length (in bytes)
 133  * @flags: iommu protection flags
 134  * @reserved: reserved (must be zero)
 135  * @name: human-readable name of the requested memory region
 136  *
 137  * This resource entry requests the host to allocate a physically contiguous
 138  * memory region.
 139  *
 140  * These request entries should precede other firmware resource entries,
 141  * as other entries might request placing other data objects inside
 142  * these memory regions (e.g. data/code segments, trace resource entries, ...).
 143  *
 144  * Allocating memory this way helps utilizing the reserved physical memory
 145  * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
 146  * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
 147  * pressure is important; it may have a substantial impact on performance.
 148  *
 149  * If the firmware is compiled with static addresses, then @da should specify
 150  * the expected device address of this memory region. If @da is set to
 151  * FW_RSC_ADDR_ANY, then the host will dynamically allocate it, and then
 152  * overwrite @da with the dynamically allocated address.
 153  *
 154  * We will always use @da to negotiate the device addresses, even if it
 155  * isn't using an iommu. In that case, though, it will obviously contain
 156  * physical addresses.
 157  *
 158  * Some remote processors needs to know the allocated physical address
 159  * even if they do use an iommu. This is needed, e.g., if they control
 160  * hardware accelerators which access the physical memory directly (this
 161  * is the case with OMAP4 for instance). In that case, the host will
 162  * overwrite @pa with the dynamically allocated physical address.
 163  * Generally we don't want to expose physical addresses if we don't have to
 164  * (remote processors are generally _not_ trusted), so we might want to
 165  * change this to happen _only_ when explicitly required by the hardware.
 166  *
 167  * @flags is used to provide IOMMU protection flags, and @name should
 168  * (optionally) contain a human readable name of this carveout region
 169  * (mainly for debugging purposes).
 170  */
 171 struct fw_rsc_carveout {
 172         u32 da;
 173         u32 pa;
 174         u32 len;
 175         u32 flags;
 176         u32 reserved;
 177         u8 name[32];
 178 } __packed;
 179
 180 /**
 181  * struct fw_rsc_devmem - iommu mapping request
 182  * @da: device address
 183  * @pa: physical address
 184  * @len: length (in bytes)
 185  * @flags: iommu protection flags
 186  * @reserved: reserved (must be zero)
 187  * @name: human-readable name of the requested region to be mapped
 188  *
 189  * This resource entry requests the host to iommu map a physically contiguous
 190  * memory region. This is needed in case the remote processor requires
 191  * access to certain memory-based peripherals; _never_ use it to access
 192  * regular memory.
 193  *
 194  * This is obviously only needed if the remote processor is accessing memory
 195  * via an iommu.
 196  *
 197  * @da should specify the required device address, @pa should specify
 198  * the physical address we want to map, @len should specify the size of
 199  * the mapping and @flags is the IOMMU protection flags. As always, @name may
 200  * (optionally) contain a human readable name of this mapping (mainly for
 201  * debugging purposes).
 202  *
 203  * Note: at this point we just "trust" those devmem entries to contain valid
 204  * physical addresses, but this isn't safe and will be changed: eventually we
 205  * want remoteproc implementations to provide us ranges of physical addresses
 206  * the firmware is allowed to request, and not allow firmwares to request
 207  * access to physical addresses that are outside those ranges.
 208  */
 209 struct fw_rsc_devmem {
 210         u32 da;
 211         u32 pa;
 212         u32 len;
 213         u32 flags;
 214         u32 reserved;
 215         u8 name[32];
 216 } __packed;
 217
 218 /**
 219  * struct fw_rsc_trace - trace buffer declaration
 220  * @da: device address
 221  * @len: length (in bytes)
 222  * @reserved: reserved (must be zero)
 223  * @name: human-readable name of the trace buffer
 224  *
 225  * This resource entry provides the host information about a trace buffer
 226  * into which the remote processor will write log messages.
 227  *
 228  * @da specifies the device address of the buffer, @len specifies
 229  * its size, and @name may contain a human readable name of the trace buffer.
 230  *
 231  * After booting the remote processor, the trace buffers are exposed to the
 232  * user via debugfs entries (called trace0, trace1, etc..).
 233  */
 234 struct fw_rsc_trace {
 235         u32 da;
 236         u32 len;
 237         u32 reserved;
 238         u8 name[32];
 239 } __packed;
 240
 241 /**
 242  * struct fw_rsc_vdev_vring - vring descriptor entry
 243  * @da: device address
 244  * @align: the alignment between the consumer and producer parts of the vring
 245  * @num: num of buffers supported by this vring (must be power of two)
 246  * @notifyid is a unique rproc-wide notify index for this vring. This notify
 247  * index is used when kicking a remote processor, to let it know that this
 248  * vring is triggered.
 249  * @pa: physical address
 250  *
 251  * This descriptor is not a resource entry by itself; it is part of the
 252  * vdev resource type (see below).
 253  *
 254  * Note that @da should either contain the device address where
 255  * the remote processor is expecting the vring, or indicate that
 256  * dynamically allocation of the vring's device address is supported.
 257  */
 258 struct fw_rsc_vdev_vring {
 259         u32 da;
 260         u32 align;
 261         u32 num;
 262         u32 notifyid;
 263         u32 pa;
 264 } __packed;
 265
 266 /**
 267  * struct fw_rsc_vdev - virtio device header
 268  * @id: virtio device id (as in virtio_ids.h)
 269  * @notifyid is a unique rproc-wide notify index for this vdev. This notify
 270  * index is used when kicking a remote processor, to let it know that the
 271  * status/features of this vdev have changes.
 272  * @dfeatures specifies the virtio device features supported by the firmware
 273  * @gfeatures is a place holder used by the host to write back the
 274  * negotiated features that are supported by both sides.
 275  * @config_len is the size of the virtio config space of this vdev. The config
 276  * space lies in the resource table immediate after this vdev header.
 277  * @status is a place holder where the host will indicate its virtio progress.
 278  * @num_of_vrings indicates how many vrings are described in this vdev header
 279  * @reserved: reserved (must be zero)
 280  * @vring is an array of @num_of_vrings entries of 'struct fw_rsc_vdev_vring'.
 281  *
 282  * This resource is a virtio device header: it provides information about
 283  * the vdev, and is then used by the host and its peer remote processors
 284  * to negotiate and share certain virtio properties.
 285  *
 286  * By providing this resource entry, the firmware essentially asks remoteproc
 287  * to statically allocate a vdev upon registration of the rproc (dynamic vdev
 288  * allocation is not yet supported).
 289  *
 290  * Note: unlike virtualization systems, the term 'host' here means
 291  * the Linux side which is running remoteproc to control the remote
 292  * processors. We use the name 'gfeatures' to comply with virtio's terms,
 293  * though there isn't really any virtualized guest OS here: it's the host
 294  * which is responsible for negotiating the final features.
 295  * Yeah, it's a bit confusing.
 296  *
 297  * Note: immediately following this structure is the virtio config space for
 298  * this vdev (which is specific to the vdev; for more info, read the virtio
 299  * spec). the size of the config space is specified by @config_len.
 300  */
 301 struct fw_rsc_vdev {
 302         u32 id;
 303         u32 notifyid;
 304         u32 dfeatures;
 305         u32 gfeatures;
 306         u32 config_len;
 307         u8 status;
 308         u8 num_of_vrings;
 309         u8 reserved[2];
 310         struct fw_rsc_vdev_vring vring[];
 311 } __packed;
 312
 313 struct rproc;
 314
 315 /**
 316  * struct rproc_mem_entry - memory entry descriptor
 317  * @va: virtual address
 318  * @is_iomem: io memory
 319  * @dma: dma address
 320  * @len: length, in bytes
 321  * @da: device address
 322  * @release: release associated memory
 323  * @priv: associated data
 324  * @name: associated memory region name (optional)
 325  * @node: list node
 326  * @rsc_offset: offset in resource table
 327  * @flags: iommu protection flags
 328  * @of_resm_idx: reserved memory phandle index
 329  * @alloc: specific memory allocator function
 330  */
 331 struct rproc_mem_entry {
 332         void *va;
 333         bool is_iomem;
 334         dma_addr_t dma;
 335         size_t len;
 336         u32 da;
 337         void *priv;
 338         char name[32];
 339         struct list_head node;
 340         u32 rsc_offset;
 341         u32 flags;
 342         u32 of_resm_idx;
 343         int (*alloc)(struct rproc *rproc, struct rproc_mem_entry *mem);
 344         int (*release)(struct rproc *rproc, struct rproc_mem_entry *mem);
 345 };
 346
 347 struct firmware;
 348
 349 /**
 350  * enum rsc_handling_status - return status of rproc_ops handle_rsc hook
 351  * @RSC_HANDLED:        resource was handled
 352  * @RSC_IGNORED:        resource was ignored
 353  */
 354 enum rsc_handling_status {
 355         RSC_HANDLED     = 0,
 356         RSC_IGNORED     = 1,
 357 };
 358
 359 /**
 360  * struct rproc_ops - platform-specific device handlers
 361  * @prepare:    prepare device for code loading
 362  * @unprepare:  unprepare device after stop
 363  * @start:      power on the device and boot it
 364  * @stop:       power off the device
 365  * @attach:     attach to a device that his already powered up
 366  * @detach:     detach from a device, leaving it powered up
 367  * @kick:       kick a virtqueue (virtqueue id given as a parameter)
 368  * @da_to_va:   optional platform hook to perform address translations
 369  * @parse_fw:   parse firmware to extract information (e.g. resource table)
 370  * @handle_rsc: optional platform hook to handle vendor resources. Should return
 371  * RSC_HANDLED if resource was handled, RSC_IGNORED if not handled and a
 372  * negative value on error
 373  * @load_rsc_table:     load resource table from firmware image
 374  * @find_loaded_rsc_table: find the loaded resource table from firmware image
 375  * @get_loaded_rsc_table: get resource table installed in memory
 376  *                        by external entity
 377  * @load:               load firmware to memory, where the remote processor
 378  *                      expects to find it
 379  * @sanity_check:       sanity check the fw image
 380  * @get_boot_addr:      get boot address to entry point specified in firmware
 381  * @panic:      optional callback to react to system panic, core will delay
 382  *              panic at least the returned number of milliseconds
 383  * @coredump:     collect firmware dump after the subsystem is shutdown
 384  */
 385 struct rproc_ops {
 386         int (*prepare)(struct rproc *rproc);
 387         int (*unprepare)(struct rproc *rproc);
 388         int (*start)(struct rproc *rproc);
 389         int (*stop)(struct rproc *rproc);
 390         int (*attach)(struct rproc *rproc);
 391         int (*detach)(struct rproc *rproc);
 392         void (*kick)(struct rproc *rproc, int vqid);
 393         void * (*da_to_va)(struct rproc *rproc, u64 da, size_t len, bool *is_iomem);
 394         int (*parse_fw)(struct rproc *rproc, const struct firmware *fw);
 395         int (*handle_rsc)(struct rproc *rproc, u32 rsc_type, void *rsc,
 396                           int offset, int avail);
 397         struct resource_table *(*find_loaded_rsc_table)(
 398                                 struct rproc *rproc, const struct firmware *fw);
 399         struct resource_table *(*get_loaded_rsc_table)(
 400                                 struct rproc *rproc, size_t *size);
 401         int (*load)(struct rproc *rproc, const struct firmware *fw);
 402         int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
 403         u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
 404         unsigned long (*panic)(struct rproc *rproc);
 405         void (*coredump)(struct rproc *rproc);
 406 };
 407
 408 /**
 409  * enum rproc_state - remote processor states
 410  * @RPROC_OFFLINE:      device is powered off
 411  * @RPROC_SUSPENDED:    device is suspended; needs to be woken up to receive
 412  *                      a message.
 413  * @RPROC_RUNNING:      device is up and running
 414  * @RPROC_CRASHED:      device has crashed; need to start recovery
 415  * @RPROC_DELETED:      device is deleted
 416  * @RPROC_ATTACHED:     device has been booted by another entity and the core
 417  *                      has attached to it
 418  * @RPROC_DETACHED:     device has been booted by another entity and waiting
 419  *                      for the core to attach to it
 420  * @RPROC_LAST:         just keep this one at the end
 421  *
 422  * Please note that the values of these states are used as indices
 423  * to rproc_state_string, a state-to-name lookup table,
 424  * so please keep the two synchronized. @RPROC_LAST is used to check
 425  * the validity of an index before the lookup table is accessed, so
 426  * please update it as needed too.
 427  */
 428 enum rproc_state {
 429         RPROC_OFFLINE   = 0,
 430         RPROC_SUSPENDED = 1,
 431         RPROC_RUNNING   = 2,
 432         RPROC_CRASHED   = 3,
 433         RPROC_DELETED   = 4,
 434         RPROC_ATTACHED  = 5,
 435         RPROC_DETACHED  = 6,
 436         RPROC_LAST      = 7,
 437 };
 438
 439 /**
 440  * enum rproc_crash_type - remote processor crash types
 441  * @RPROC_MMUFAULT:     iommu fault
 442  * @RPROC_WATCHDOG:     watchdog bite
 443  * @RPROC_FATAL_ERROR   fatal error
 444  *
 445  * Each element of the enum is used as an array index. So that, the value of
 446  * the elements should be always something sane.
 447  *
 448  * Feel free to add more types when needed.
 449  */
 450 enum rproc_crash_type {
 451         RPROC_MMUFAULT,
 452         RPROC_WATCHDOG,
 453         RPROC_FATAL_ERROR,
 454 };
 455
 456 /**
 457  * enum rproc_dump_mechanism - Coredump options for core
 458  * @RPROC_COREDUMP_DISABLED:    Don't perform any dump
 459  * @RPROC_COREDUMP_ENABLED:     Copy dump to separate buffer and carry on with
 460                                 recovery
 461  * @RPROC_COREDUMP_INLINE:      Read segments directly from device memory. Stall
 462                                 recovery until all segments are read
 463  */
 464 enum rproc_dump_mechanism {
 465         RPROC_COREDUMP_DISABLED,
 466         RPROC_COREDUMP_ENABLED,
 467         RPROC_COREDUMP_INLINE,
 468 };
 469
 470 /**
 471  * struct rproc_dump_segment - segment info from ELF header
 472  * @node:       list node related to the rproc segment list
 473  * @da:         device address of the segment
 474  * @size:       size of the segment
 475  * @priv:       private data associated with the dump_segment
 476  * @dump:       custom dump function to fill device memory segment associated
 477  *              with coredump
 478  */
 479 struct rproc_dump_segment {
 480         struct list_head node;
 481
 482         dma_addr_t da;
 483         size_t size;
 484
 485         void *priv;
 486         void (*dump)(struct rproc *rproc, struct rproc_dump_segment *segment,
 487                      void *dest, size_t offset, size_t size);
 488         loff_t offset;
 489 };
 490
 491 /**
 492  * struct rproc - represents a physical remote processor device
 493  * @node: list node of this rproc object
 494  * @domain: iommu domain
 495  * @name: human readable name of the rproc
 496  * @firmware: name of firmware file to be loaded
 497  * @priv: private data which belongs to the platform-specific rproc module
 498  * @ops: platform-specific start/stop rproc handlers
 499  * @dev: virtual device for refcounting and common remoteproc behavior
 500  * @power: refcount of users who need this rproc powered up
 501  * @state: state of the device
 502  * @dump_conf: Currently selected coredump configuration
 503  * @lock: lock which protects concurrent manipulations of the rproc
 504  * @dbg_dir: debugfs directory of this rproc device
 505  * @traces: list of trace buffers
 506  * @num_traces: number of trace buffers
 507  * @carveouts: list of physically contiguous memory allocations
 508  * @mappings: list of iommu mappings we initiated, needed on shutdown
 509  * @bootaddr: address of first instruction to boot rproc with (optional)
 510  * @rvdevs: list of remote virtio devices
 511  * @subdevs: list of subdevices, to following the running state
 512  * @notifyids: idr for dynamically assigning rproc-wide unique notify ids
 513  * @index: index of this rproc device
 514  * @crash_handler: workqueue for handling a crash
 515  * @crash_cnt: crash counter
 516  * @recovery_disabled: flag that state if recovery was disabled
 517  * @max_notifyid: largest allocated notify id.
 518  * @table_ptr: pointer to the resource table in effect
 519  * @clean_table: copy of the resource table without modifications.  Used
 520  *               when a remote processor is attached or detached from the core
 521  * @cached_table: copy of the resource table
 522  * @table_sz: size of @cached_table
 523  * @has_iommu: flag to indicate if remote processor is behind an MMU
 524  * @auto_boot: flag to indicate if remote processor should be auto-started
 525  * @dump_segments: list of segments in the firmware
 526  * @nb_vdev: number of vdev currently handled by rproc
 527  * @char_dev: character device of the rproc
 528  * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
 529  */
 530 struct rproc {
 531         struct list_head node;
 532         struct iommu_domain *domain;
 533         const char *name;
 534         const char *firmware;
 535         void *priv;
 536         struct rproc_ops *ops;
 537         struct device dev;
 538         atomic_t power;
 539         unsigned int state;
 540         enum rproc_dump_mechanism dump_conf;
 541         struct mutex lock;
 542         struct dentry *dbg_dir;
 543         struct list_head traces;
 544         int num_traces;
 545         struct list_head carveouts;
 546         struct list_head mappings;
 547         u64 bootaddr;
 548         struct list_head rvdevs;
 549         struct list_head subdevs;
 550         struct idr notifyids;
 551         int index;
 552         struct work_struct crash_handler;
 553         unsigned int crash_cnt;
 554         bool recovery_disabled;
 555         int max_notifyid;
 556         struct resource_table *table_ptr;
 557         struct resource_table *clean_table;
 558         struct resource_table *cached_table;
 559         size_t table_sz;
 560         bool has_iommu;
 561         bool auto_boot;
 562         struct list_head dump_segments;
 563         int nb_vdev;
 564         u8 elf_class;
 565         u16 elf_machine;
 566         struct cdev cdev;
 567         bool cdev_put_on_release;
 568 };
 569
 570 /**
 571  * struct rproc_subdev - subdevice tied to a remoteproc
 572  * @node: list node related to the rproc subdevs list
 573  * @prepare: prepare function, called before the rproc is started
 574  * @start: start function, called after the rproc has been started
 575  * @stop: stop function, called before the rproc is stopped; the @crashed
 576  *          parameter indicates if this originates from a recovery
 577  * @unprepare: unprepare function, called after the rproc has been stopped
 578  */
 579 struct rproc_subdev {
 580         struct list_head node;
 581
 582         int (*prepare)(struct rproc_subdev *subdev);
 583         int (*start)(struct rproc_subdev *subdev);
 584         void (*stop)(struct rproc_subdev *subdev, bool crashed);
 585         void (*unprepare)(struct rproc_subdev *subdev);
 586 };
 587
 588 /* we currently support only two vrings per rvdev */
 589
 590 #define RVDEV_NUM_VRINGS 2
 591
 592 /**
 593  * struct rproc_vring - remoteproc vring state
 594  * @va: virtual address
 595  * @len: length, in bytes
 596  * @da: device address
 597  * @align: vring alignment
 598  * @notifyid: rproc-specific unique vring index
 599  * @rvdev: remote vdev
 600  * @vq: the virtqueue of this vring
 601  */
 602 struct rproc_vring {
 603         void *va;
 604         int len;
 605         u32 da;
 606         u32 align;
 607         int notifyid;
 608         struct rproc_vdev *rvdev;
 609         struct virtqueue *vq;
 610 };
 611
 612 /**
 613  * struct rproc_vdev - remoteproc state for a supported virtio device
 614  * @refcount: reference counter for the vdev and vring allocations
 615  * @subdev: handle for registering the vdev as a rproc subdevice
 616  * @id: virtio device id (as in virtio_ids.h)
 617  * @node: list node
 618  * @rproc: the rproc handle
 619  * @vdev: the virio device
 620  * @vring: the vrings for this vdev
 621  * @rsc_offset: offset of the vdev's resource entry
 622  * @index: vdev position versus other vdev declared in resource table
 623  */
 624 struct rproc_vdev {
 625         struct kref refcount;
 626
 627         struct rproc_subdev subdev;
 628         struct device dev;
 629
 630         unsigned int id;
 631         struct list_head node;
 632         struct rproc *rproc;
 633         struct rproc_vring vring[RVDEV_NUM_VRINGS];
 634         u32 rsc_offset;
 635         u32 index;
 636 };
 637
 638 struct rproc *rproc_get_by_phandle(phandle phandle);
 639 struct rproc *rproc_get_by_child(struct device *dev);
 640
 641 struct rproc *rproc_alloc(struct device *dev, const char *name,
 642                           const struct rproc_ops *ops,
 643                           const char *firmware, int len);
 644 void rproc_put(struct rproc *rproc);
 645 int rproc_add(struct rproc *rproc);
 646 int rproc_del(struct rproc *rproc);
 647 void rproc_free(struct rproc *rproc);
 648 void rproc_resource_cleanup(struct rproc *rproc);
 649
 650 struct rproc *devm_rproc_alloc(struct device *dev, const char *name,
 651                                const struct rproc_ops *ops,
 652                                const char *firmware, int len);
 653 int devm_rproc_add(struct device *dev, struct rproc *rproc);
 654
 655 void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry *mem);
 656
 657 struct rproc_mem_entry *
 658 rproc_mem_entry_init(struct device *dev,
 659                      void *va, dma_addr_t dma, size_t len, u32 da,
 660                      int (*alloc)(struct rproc *, struct rproc_mem_entry *),
 661                      int (*release)(struct rproc *, struct rproc_mem_entry *),
 662                      const char *name, ...);
 663
 664 struct rproc_mem_entry *
 665 rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
 666                              u32 da, const char *name, ...);
 667
 668 int rproc_boot(struct rproc *rproc);
 669 void rproc_shutdown(struct rproc *rproc);
 670 int rproc_detach(struct rproc *rproc);
 671 int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
 672 void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
 673 void rproc_coredump_using_sections(struct rproc *rproc);
 674 int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size);
 675 int rproc_coredump_add_custom_segment(struct rproc *rproc,
 676                                       dma_addr_t da, size_t size,
 677                                       void (*dumpfn)(struct rproc *rproc,
 678                                                      struct rproc_dump_segment *segment,
 679                                                      void *dest, size_t offset,
 680                                                      size_t size),
 681                                       void *priv);
 682 int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine);
 683
 684 static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
 685 {
 686         return container_of(vdev->dev.parent, struct rproc_vdev, dev);
 687 }
 688
 689 static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
 690 {
 691         struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
 692
 693         return rvdev->rproc;
 694 }
 695
 696 void rproc_add_subdev(struct rproc *rproc, struct rproc_subdev *subdev);
 697
 698 void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev);
 699
 700 #endif /* REMOTEPROC_H */