The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/bus_if.m

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    1 #-
    2 # Copyright (c) 1998-2004 Doug Rabson
    3 # All rights reserved.
    4 #
    5 # Redistribution and use in source and binary forms, with or without
    6 # modification, are permitted provided that the following conditions
    7 # are met:
    8 # 1. Redistributions of source code must retain the above copyright
    9 #    notice, this list of conditions and the following disclaimer.
   10 # 2. Redistributions in binary form must reproduce the above copyright
   11 #    notice, this list of conditions and the following disclaimer in the
   12 #    documentation and/or other materials provided with the distribution.
   13 #
   14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24 # SUCH DAMAGE.
   25 #
   26 # $FreeBSD: stable/10/sys/kern/bus_if.m 302234 2016-06-27 21:50:30Z bdrewery $
   27 #
   28 
   29 #include <sys/types.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 
   33 /**
   34  * @defgroup BUS bus - KObj methods for drivers of devices with children
   35  * @brief A set of methods required device drivers that support
   36  * child devices.
   37  * @{
   38  */
   39 INTERFACE bus;
   40 
   41 #
   42 # Default implementations of some methods.
   43 #
   44 CODE {
   45         static struct resource *
   46         null_alloc_resource(device_t dev, device_t child,
   47             int type, int *rid, u_long start, u_long end,
   48             u_long count, u_int flags)
   49         {
   50             return (0);
   51         }
   52 
   53         static int
   54         null_remap_intr(device_t bus, device_t dev, u_int irq)
   55         {
   56 
   57                 if (dev != NULL)
   58                         return (BUS_REMAP_INTR(dev, NULL, irq));
   59                 return (ENXIO);
   60         }
   61 
   62         static device_t
   63         null_add_child(device_t bus, int order, const char *name,
   64             int unit)
   65         {
   66 
   67                 panic("bus_add_child is not implemented");
   68         }
   69 };
   70 
   71 /**
   72  * @brief Print a description of a child device
   73  *
   74  * This is called from system code which prints out a description of a
   75  * device. It should describe the attachment that the child has with
   76  * the parent. For instance the TurboLaser bus prints which node the
   77  * device is attached to. See bus_generic_print_child() for more 
   78  * information.
   79  *
   80  * @param _dev          the device whose child is being printed
   81  * @param _child        the child device to describe
   82  *
   83  * @returns             the number of characters output.
   84  */
   85 METHOD int print_child {
   86         device_t _dev;
   87         device_t _child;
   88 } DEFAULT bus_generic_print_child;
   89 
   90 /**
   91  * @brief Print a notification about an unprobed child device.
   92  *
   93  * Called for each child device that did not succeed in probing for a
   94  * driver.
   95  *
   96  * @param _dev          the device whose child was being probed
   97  * @param _child        the child device which failed to probe
   98  */   
   99 METHOD void probe_nomatch {
  100         device_t _dev;
  101         device_t _child;
  102 };
  103 
  104 /**
  105  * @brief Read the value of a bus-specific attribute of a device
  106  *
  107  * This method, along with BUS_WRITE_IVAR() manages a bus-specific set
  108  * of instance variables of a child device.  The intention is that
  109  * each different type of bus defines a set of appropriate instance
  110  * variables (such as ports and irqs for ISA bus etc.)
  111  *
  112  * This information could be given to the child device as a struct but
  113  * that makes it hard for a bus to add or remove variables without
  114  * forcing an edit and recompile for all drivers which may not be
  115  * possible for vendor supplied binary drivers.
  116  *
  117  * This method copies the value of an instance variable to the
  118  * location specified by @p *_result.
  119  * 
  120  * @param _dev          the device whose child was being examined
  121  * @param _child        the child device whose instance variable is
  122  *                      being read
  123  * @param _index        the instance variable to read
  124  * @param _result       a location to receive the instance variable
  125  *                      value
  126  * 
  127  * @retval 0            success
  128  * @retval ENOENT       no such instance variable is supported by @p
  129  *                      _dev 
  130  */
  131 METHOD int read_ivar {
  132         device_t _dev;
  133         device_t _child;
  134         int _index;
  135         uintptr_t *_result;
  136 };
  137 
  138 /**
  139  * @brief Write the value of a bus-specific attribute of a device
  140  * 
  141  * This method sets the value of an instance variable to @p _value.
  142  * 
  143  * @param _dev          the device whose child was being updated
  144  * @param _child        the child device whose instance variable is
  145  *                      being written
  146  * @param _index        the instance variable to write
  147  * @param _value        the value to write to that instance variable
  148  * 
  149  * @retval 0            success
  150  * @retval ENOENT       no such instance variable is supported by @p
  151  *                      _dev 
  152  * @retval EINVAL       the instance variable was recognised but
  153  *                      contains a read-only value
  154  */
  155 METHOD int write_ivar {
  156         device_t _dev;
  157         device_t _child;
  158         int _indx;
  159         uintptr_t _value;
  160 };
  161 
  162 /**
  163  * @brief Notify a bus that a child was deleted
  164  *
  165  * Called at the beginning of device_delete_child() to allow the parent
  166  * to teardown any bus-specific state for the child.
  167  * 
  168  * @param _dev          the device whose child is being deleted
  169  * @param _child        the child device which is being deleted
  170  */
  171 METHOD void child_deleted {
  172         device_t _dev;
  173         device_t _child;
  174 };
  175 
  176 /**
  177  * @brief Notify a bus that a child was detached
  178  *
  179  * Called after the child's DEVICE_DETACH() method to allow the parent
  180  * to reclaim any resources allocated on behalf of the child.
  181  * 
  182  * @param _dev          the device whose child changed state
  183  * @param _child        the child device which changed state
  184  */
  185 METHOD void child_detached {
  186         device_t _dev;
  187         device_t _child;
  188 };
  189 
  190 /**
  191  * @brief Notify a bus that a new driver was added
  192  * 
  193  * Called when a new driver is added to the devclass which owns this
  194  * bus. The generic implementation of this method attempts to probe and
  195  * attach any un-matched children of the bus.
  196  * 
  197  * @param _dev          the device whose devclass had a new driver
  198  *                      added to it
  199  * @param _driver       the new driver which was added
  200  */
  201 METHOD void driver_added {
  202         device_t _dev;
  203         driver_t *_driver;
  204 } DEFAULT bus_generic_driver_added;
  205 
  206 /**
  207  * @brief Create a new child device
  208  *
  209  * For busses which use use drivers supporting DEVICE_IDENTIFY() to
  210  * enumerate their devices, this method is used to create new
  211  * device instances. The new device will be added after the last
  212  * existing child with the same order.
  213  * 
  214  * @param _dev          the bus device which will be the parent of the
  215  *                      new child device
  216  * @param _order        a value which is used to partially sort the
  217  *                      children of @p _dev - devices created using
  218  *                      lower values of @p _order appear first in @p
  219  *                      _dev's list of children
  220  * @param _name         devclass name for new device or @c NULL if not
  221  *                      specified
  222  * @param _unit         unit number for new device or @c -1 if not
  223  *                      specified
  224  */
  225 METHOD device_t add_child {
  226         device_t _dev;
  227         u_int _order;
  228         const char *_name;
  229         int _unit;
  230 } DEFAULT null_add_child;
  231 
  232 /**
  233  * @brief Allocate a system resource
  234  *
  235  * This method is called by child devices of a bus to allocate resources.
  236  * The types are defined in <machine/resource.h>; the meaning of the
  237  * resource-ID field varies from bus to bus (but @p *rid == 0 is always
  238  * valid if the resource type is). If a resource was allocated and the
  239  * caller did not use the RF_ACTIVE to specify that it should be
  240  * activated immediately, the caller is responsible for calling
  241  * BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
  242  *
  243  * @param _dev          the parent device of @p _child
  244  * @param _child        the device which is requesting an allocation
  245  * @param _type         the type of resource to allocate
  246  * @param _rid          a pointer to the resource identifier
  247  * @param _start        hint at the start of the resource range - pass
  248  *                      @c 0UL for any start address
  249  * @param _end          hint at the end of the resource range - pass
  250  *                      @c ~0UL for any end address
  251  * @param _count        hint at the size of range required - pass @c 1
  252  *                      for any size
  253  * @param _flags        any extra flags to control the resource
  254  *                      allocation - see @c RF_XXX flags in
  255  *                      <sys/rman.h> for details
  256  * 
  257  * @returns             the resource which was allocated or @c NULL if no
  258  *                      resource could be allocated
  259  */
  260 METHOD struct resource * alloc_resource {
  261         device_t        _dev;
  262         device_t        _child;
  263         int             _type;
  264         int            *_rid;
  265         u_long          _start;
  266         u_long          _end;
  267         u_long          _count;
  268         u_int           _flags;
  269 } DEFAULT null_alloc_resource;
  270 
  271 /**
  272  * @brief Activate a resource
  273  *
  274  * Activate a resource previously allocated with
  275  * BUS_ALLOC_RESOURCE(). This may for instance map a memory region
  276  * into the kernel's virtual address space.
  277  *
  278  * @param _dev          the parent device of @p _child
  279  * @param _child        the device which allocated the resource
  280  * @param _type         the type of resource
  281  * @param _rid          the resource identifier
  282  * @param _r            the resource to activate
  283  */
  284 METHOD int activate_resource {
  285         device_t        _dev;
  286         device_t        _child;
  287         int             _type;
  288         int             _rid;
  289         struct resource *_r;
  290 };
  291 
  292 /**
  293  * @brief Deactivate a resource
  294  *
  295  * Deactivate a resource previously allocated with
  296  * BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region
  297  * from the kernel's virtual address space.
  298  *
  299  * @param _dev          the parent device of @p _child
  300  * @param _child        the device which allocated the resource
  301  * @param _type         the type of resource
  302  * @param _rid          the resource identifier
  303  * @param _r            the resource to deactivate
  304  */
  305 METHOD int deactivate_resource {
  306         device_t        _dev;
  307         device_t        _child;
  308         int             _type;
  309         int             _rid;
  310         struct resource *_r;
  311 };
  312 
  313 /**
  314  * @brief Adjust a resource
  315  *
  316  * Adjust the start and/or end of a resource allocated by
  317  * BUS_ALLOC_RESOURCE.  At least part of the new address range must overlap
  318  * with the existing address range.  If the successful, the resource's range
  319  * will be adjusted to [start, end] on return.
  320  *
  321  * @param _dev          the parent device of @p _child
  322  * @param _child        the device which allocated the resource
  323  * @param _type         the type of resource
  324  * @param _res          the resource to adjust
  325  * @param _start        the new starting address of the resource range
  326  * @param _end          the new ending address of the resource range
  327  */
  328 METHOD int adjust_resource {
  329         device_t        _dev;
  330         device_t        _child;
  331         int             _type;
  332         struct resource *_res;
  333         u_long          _start;
  334         u_long          _end;
  335 };
  336 
  337 /**
  338  * @brief Release a resource
  339  *
  340  * Free a resource allocated by the BUS_ALLOC_RESOURCE.  The @p _rid
  341  * value must be the same as the one returned by BUS_ALLOC_RESOURCE()
  342  * (which is not necessarily the same as the one the client passed).
  343  *
  344  * @param _dev          the parent device of @p _child
  345  * @param _child        the device which allocated the resource
  346  * @param _type         the type of resource
  347  * @param _rid          the resource identifier
  348  * @param _r            the resource to release
  349  */
  350 METHOD int release_resource {
  351         device_t        _dev;
  352         device_t        _child;
  353         int             _type;
  354         int             _rid;
  355         struct resource *_res;
  356 };
  357 
  358 /**
  359  * @brief Install an interrupt handler
  360  *
  361  * This method is used to associate an interrupt handler function with
  362  * an irq resource. When the interrupt triggers, the function @p _intr
  363  * will be called with the value of @p _arg as its single
  364  * argument. The value returned in @p *_cookiep is used to cancel the
  365  * interrupt handler - the caller should save this value to use in a
  366  * future call to BUS_TEARDOWN_INTR().
  367  * 
  368  * @param _dev          the parent device of @p _child
  369  * @param _child        the device which allocated the resource
  370  * @param _irq          the resource representing the interrupt
  371  * @param _flags        a set of bits from enum intr_type specifying
  372  *                      the class of interrupt
  373  * @param _intr         the function to call when the interrupt
  374  *                      triggers
  375  * @param _arg          a value to use as the single argument in calls
  376  *                      to @p _intr
  377  * @param _cookiep      a pointer to a location to receive a cookie
  378  *                      value that may be used to remove the interrupt
  379  *                      handler
  380  */
  381 METHOD int setup_intr {
  382         device_t        _dev;
  383         device_t        _child;
  384         struct resource *_irq;
  385         int             _flags;
  386         driver_filter_t *_filter;
  387         driver_intr_t   *_intr;
  388         void            *_arg;
  389         void            **_cookiep;
  390 };
  391 
  392 /**
  393  * @brief Uninstall an interrupt handler
  394  *
  395  * This method is used to disassociate an interrupt handler function
  396  * with an irq resource. The value of @p _cookie must be the value
  397  * returned from a previous call to BUS_SETUP_INTR().
  398  * 
  399  * @param _dev          the parent device of @p _child
  400  * @param _child        the device which allocated the resource
  401  * @param _irq          the resource representing the interrupt
  402  * @param _cookie       the cookie value returned when the interrupt
  403  *                      was originally registered
  404  */
  405 METHOD int teardown_intr {
  406         device_t        _dev;
  407         device_t        _child;
  408         struct resource *_irq;
  409         void            *_cookie;
  410 };
  411 
  412 /**
  413  * @brief Define a resource which can be allocated with
  414  * BUS_ALLOC_RESOURCE().
  415  *
  416  * This method is used by some busses (typically ISA) to allow a
  417  * driver to describe a resource range that it would like to
  418  * allocate. The resource defined by @p _type and @p _rid is defined
  419  * to start at @p _start and to include @p _count indices in its
  420  * range.
  421  * 
  422  * @param _dev          the parent device of @p _child
  423  * @param _child        the device which owns the resource
  424  * @param _type         the type of resource
  425  * @param _rid          the resource identifier
  426  * @param _start        the start of the resource range
  427  * @param _count        the size of the resource range
  428  */
  429 METHOD int set_resource {
  430         device_t        _dev;
  431         device_t        _child;
  432         int             _type;
  433         int             _rid;
  434         u_long          _start;
  435         u_long          _count;
  436 };
  437 
  438 /**
  439  * @brief Describe a resource
  440  *
  441  * This method allows a driver to examine the range used for a given
  442  * resource without actually allocating it.
  443  * 
  444  * @param _dev          the parent device of @p _child
  445  * @param _child        the device which owns the resource
  446  * @param _type         the type of resource
  447  * @param _rid          the resource identifier
  448  * @param _start        the address of a location to receive the start
  449  *                      index of the resource range
  450  * @param _count        the address of a location to receive the size
  451  *                      of the resource range
  452  */
  453 METHOD int get_resource {
  454         device_t        _dev;
  455         device_t        _child;
  456         int             _type;
  457         int             _rid;
  458         u_long          *_startp;
  459         u_long          *_countp;
  460 };
  461 
  462 /**
  463  * @brief Delete a resource.
  464  * 
  465  * Use this to delete a resource (possibly one previously added with
  466  * BUS_SET_RESOURCE()).
  467  * 
  468  * @param _dev          the parent device of @p _child
  469  * @param _child        the device which owns the resource
  470  * @param _type         the type of resource
  471  * @param _rid          the resource identifier
  472  */
  473 METHOD void delete_resource {
  474         device_t        _dev;
  475         device_t        _child;
  476         int             _type;
  477         int             _rid;
  478 };
  479 
  480 /**
  481  * @brief Return a struct resource_list.
  482  *
  483  * Used by drivers which use bus_generic_rl_alloc_resource() etc. to
  484  * implement their resource handling. It should return the resource
  485  * list of the given child device.
  486  * 
  487  * @param _dev          the parent device of @p _child
  488  * @param _child        the device which owns the resource list
  489  */
  490 METHOD struct resource_list * get_resource_list {
  491         device_t        _dev;
  492         device_t        _child;
  493 } DEFAULT bus_generic_get_resource_list;
  494 
  495 /**
  496  * @brief Is the hardware described by @p _child still attached to the
  497  * system?
  498  *
  499  * This method should return 0 if the device is not present.  It
  500  * should return -1 if it is present.  Any errors in determining
  501  * should be returned as a normal errno value.  Client drivers are to
  502  * assume that the device is present, even if there is an error
  503  * determining if it is there.  Busses are to try to avoid returning
  504  * errors, but newcard will return an error if the device fails to
  505  * implement this method.
  506  * 
  507  * @param _dev          the parent device of @p _child
  508  * @param _child        the device which is being examined
  509  */
  510 METHOD int child_present {
  511         device_t        _dev;
  512         device_t        _child;
  513 } DEFAULT bus_generic_child_present;
  514 
  515 /**
  516  * @brief Returns the pnp info for this device.
  517  *
  518  * Return it as a string.  If the string is insufficient for the
  519  * storage, then return EOVERFLOW.
  520  * 
  521  * @param _dev          the parent device of @p _child
  522  * @param _child        the device which is being examined
  523  * @param _buf          the address of a buffer to receive the pnp
  524  *                      string
  525  * @param _buflen       the size of the buffer pointed to by @p _buf
  526  */
  527 METHOD int child_pnpinfo_str {
  528         device_t        _dev;
  529         device_t        _child;
  530         char            *_buf;
  531         size_t          _buflen;
  532 };
  533 
  534 /**
  535  * @brief Returns the location for this device.
  536  *
  537  * Return it as a string.  If the string is insufficient for the
  538  * storage, then return EOVERFLOW.
  539  * 
  540  * @param _dev          the parent device of @p _child
  541  * @param _child        the device which is being examined
  542  * @param _buf          the address of a buffer to receive the location
  543  *                      string
  544  * @param _buflen       the size of the buffer pointed to by @p _buf
  545  */
  546 METHOD int child_location_str {
  547         device_t        _dev;
  548         device_t        _child;
  549         char            *_buf;
  550         size_t          _buflen;
  551 };
  552 
  553 /**
  554  * @brief Allow drivers to request that an interrupt be bound to a specific
  555  * CPU.
  556  * 
  557  * @param _dev          the parent device of @p _child
  558  * @param _child        the device which allocated the resource
  559  * @param _irq          the resource representing the interrupt
  560  * @param _cpu          the CPU to bind the interrupt to
  561  */
  562 METHOD int bind_intr {
  563         device_t        _dev;
  564         device_t        _child;
  565         struct resource *_irq;
  566         int             _cpu;
  567 } DEFAULT bus_generic_bind_intr;
  568 
  569 /**
  570  * @brief Allow (bus) drivers to specify the trigger mode and polarity
  571  * of the specified interrupt.
  572  * 
  573  * @param _dev          the bus device
  574  * @param _irq          the interrupt number to modify
  575  * @param _trig         the trigger mode required
  576  * @param _pol          the interrupt polarity required
  577  */
  578 METHOD int config_intr {
  579         device_t        _dev;
  580         int             _irq;
  581         enum intr_trigger _trig;
  582         enum intr_polarity _pol;
  583 } DEFAULT bus_generic_config_intr;
  584 
  585 /**
  586  * @brief Allow drivers to associate a description with an active
  587  * interrupt handler.
  588  *
  589  * @param _dev          the parent device of @p _child
  590  * @param _child        the device which allocated the resource
  591  * @param _irq          the resource representing the interrupt
  592  * @param _cookie       the cookie value returned when the interrupt
  593  *                      was originally registered
  594  * @param _descr        the description to associate with the interrupt
  595  */
  596 METHOD int describe_intr {
  597         device_t        _dev;
  598         device_t        _child;
  599         struct resource *_irq;
  600         void            *_cookie;
  601         const char      *_descr;
  602 } DEFAULT bus_generic_describe_intr;
  603 
  604 /**
  605  * @brief Notify a (bus) driver about a child that the hints mechanism
  606  * believes it has discovered.
  607  *
  608  * The bus is responsible for then adding the child in the right order
  609  * and discovering other things about the child.  The bus driver is
  610  * free to ignore this hint, to do special things, etc.  It is all up
  611  * to the bus driver to interpret.
  612  *
  613  * This method is only called in response to the parent bus asking for
  614  * hinted devices to be enumerated.
  615  *
  616  * @param _dev          the bus device
  617  * @param _dname        the name of the device w/o unit numbers
  618  * @param _dunit        the unit number of the device
  619  */
  620 METHOD void hinted_child {
  621         device_t        _dev;
  622         const char      *_dname;
  623         int             _dunit;
  624 };
  625 
  626 /**
  627  * @brief Returns bus_dma_tag_t for use w/ devices on the bus.
  628  *
  629  * @param _dev          the parent device of @p _child
  630  * @param _child        the device to which the tag will belong
  631  */
  632 METHOD bus_dma_tag_t get_dma_tag {
  633         device_t        _dev;
  634         device_t        _child;
  635 } DEFAULT bus_generic_get_dma_tag;
  636 
  637 /**
  638  * @brief Allow the bus to determine the unit number of a device.
  639  *
  640  * @param _dev          the parent device of @p _child
  641  * @param _child        the device whose unit is to be wired
  642  * @param _name         the name of the device's new devclass
  643  * @param _unitp        a pointer to the device's new unit value
  644  */
  645 METHOD void hint_device_unit {
  646         device_t        _dev;
  647         device_t        _child;
  648         const char      *_name;
  649         int             *_unitp;
  650 };
  651 
  652 /**
  653  * @brief Notify a bus that the bus pass level has been changed
  654  *
  655  * @param _dev          the bus device
  656  */
  657 METHOD void new_pass {
  658         device_t        _dev;
  659 } DEFAULT bus_generic_new_pass;
  660 
  661 /**
  662  * @brief Notify a bus that specified child's IRQ should be remapped.
  663  *
  664  * @param _dev          the bus device
  665  * @param _child        the child device
  666  * @param _irq          the irq number
  667  */
  668 METHOD int remap_intr {
  669         device_t        _dev;
  670         device_t        _child;
  671         u_int           _irq;
  672 } DEFAULT null_remap_intr;
  673 
  674 /**
  675  * @brief Get the VM domain handle for the given bus and child.
  676  *
  677  * @param _dev          the bus device
  678  * @param _child        the child device
  679  * @param _domain       a pointer to the bus's domain handle identifier
  680  */
  681 METHOD int get_domain {
  682         device_t        _dev;
  683         device_t        _child;
  684         int             *_domain;
  685 } DEFAULT bus_generic_get_domain;

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