€••      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ&/translations/zh_CN/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ&/translations/zh_TW/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ&/translations/it_IT/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ&/translations/ja_JP/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ&/translations/ko_KR/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ&/translations/sp_SP/staging/remoteproc”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒRemote Processor Framework”h]”hŒRemote Processor Framework”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒ@/var/lib/git/docbuild/linux/Documentation/staging/remoteproc.rst”h Kubh¢)”}”(hhh]”(h§)”}”(hŒIntroduction”h]”hŒIntroduction”…””}”(hhºhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh·hžhhŸh¶h KubhŒ	paragraph”“”)”}”(hŒëModern SoCs typically have heterogeneous remote processor devices in asymmetric
multiprocessing (AMP) configurations, which may be running different instances
of operating system, whether it's Linux or any other flavor of real-time OS.”h]”hŒíModern SoCs typically have heterogeneous remote processor devices in asymmetric
multiprocessing (AMP) configurations, which may be running different instances
of operating system, whether itâ€™s Linux or any other flavor of real-time OS.”…””}”(hhÊhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khh·hžhubhÉ)”}”(hX  OMAP4, for example, has dual Cortex-A9, dual Cortex-M3 and a C64x+ DSP.
In a typical configuration, the dual cortex-A9 is running Linux in a SMP
configuration, and each of the other three cores (two M3 cores and a DSP)
is running its own instance of RTOS in an AMP configuration.”h]”hX  OMAP4, for example, has dual Cortex-A9, dual Cortex-M3 and a C64x+ DSP.
In a typical configuration, the dual cortex-A9 is running Linux in a SMP
configuration, and each of the other three cores (two M3 cores and a DSP)
is running its own instance of RTOS in an AMP configuration.”…””}”(hhØhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khh·hžhubhÉ)”}”(hX  The remoteproc framework allows different platforms/architectures to
control (power on, load firmware, power off) those remote processors while
abstracting the hardware differences, so the entire driver doesn't need to be
duplicated. In addition, this framework also adds rpmsg virtio devices
for remote processors that supports this kind of communication. This way,
platform-specific remoteproc drivers only need to provide a few low-level
handlers, and then all rpmsg drivers will then just work
(for more information about the virtio-based rpmsg bus and its drivers,
please read Documentation/staging/rpmsg.rst).
Registration of other types of virtio devices is now also possible. Firmwares
just need to publish what kind of virtio devices do they support, and then
remoteproc will add those devices. This makes it possible to reuse the
existing virtio drivers with remote processor backends at a minimal development
cost.”h]”hXŸ  The remoteproc framework allows different platforms/architectures to
control (power on, load firmware, power off) those remote processors while
abstracting the hardware differences, so the entire driver doesnâ€™t need to be
duplicated. In addition, this framework also adds rpmsg virtio devices
for remote processors that supports this kind of communication. This way,
platform-specific remoteproc drivers only need to provide a few low-level
handlers, and then all rpmsg drivers will then just work
(for more information about the virtio-based rpmsg bus and its drivers,
please read Documentation/staging/rpmsg.rst).
Registration of other types of virtio devices is now also possible. Firmwares
just need to publish what kind of virtio devices do they support, and then
remoteproc will add those devices. This makes it possible to reuse the
existing virtio drivers with remote processor backends at a minimal development
cost.”…””}”(hhæhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khh·hžhubeh}”(h]”Œintroduction”ah ]”h"]”Œintroduction”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒUser API”h]”hŒUser API”…””}”(hhÿhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hhühžhhŸh¶h K!ubhŒliteral_block”“”)”}”(hŒ#int rproc_boot(struct rproc *rproc)”h]”hŒ#int rproc_boot(struct rproc *rproc)”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1j  hŸh¶h K%hhühžhubhÉ)”}”(hŒCBoot a remote processor (i.e. load its firmware, power it on, ...).”h]”hŒCBoot a remote processor (i.e. load its firmware, power it on, ...).”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K'hhühžhubhÉ)”}”(hŒ`If the remote processor is already powered on, this function immediately
returns (successfully).”h]”hŒ`If the remote processor is already powered on, this function immediately
returns (successfully).”…””}”(hj-  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K)hhühžhubhÉ)”}”(hXA  Returns 0 on success, and an appropriate error value otherwise.
Note: to use this function you should already have a valid rproc
handle. There are several ways to achieve that cleanly (devres, pdata,
the way remoteproc_rpmsg.c does this, or, if this becomes prevalent, we
might also consider using dev_archdata for this).”h]”hXA  Returns 0 on success, and an appropriate error value otherwise.
Note: to use this function you should already have a valid rproc
handle. There are several ways to achieve that cleanly (devres, pdata,
the way remoteproc_rpmsg.c does this, or, if this becomes prevalent, we
might also consider using dev_archdata for this).”…””}”(hj;  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K,hhühžhubj  )”}”(hŒ'int rproc_shutdown(struct rproc *rproc)”h]”hŒ'int rproc_shutdown(struct rproc *rproc)”…””}”hjI  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h K4hhühžhubhÉ)”}”(hŒìPower off a remote processor (previously booted with rproc_boot()).
In case @rproc is still being used by an additional user(s), then
this function will just decrement the power refcount and exit,
without really powering off the device.”h]”hŒìPower off a remote processor (previously booted with rproc_boot()).
In case @rproc is still being used by an additional user(s), then
this function will just decrement the power refcount and exit,
without really powering off the device.”…””}”(hjW  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K6hhühžhubhÉ)”}”(hŒÉReturns 0 on success, and an appropriate error value otherwise.
Every call to rproc_boot() must (eventually) be accompanied by a call
to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.”h]”hŒÉReturns 0 on success, and an appropriate error value otherwise.
Every call to rproc_boot() must (eventually) be accompanied by a call
to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.”…””}”(hje  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K;hhühžhubhŒnote”“”)”}”(hŒßwe're not decrementing the rproc's refcount, only the power refcount.
which means that the @rproc handle stays valid even after
rproc_shutdown() returns, and users can still use it with a subsequent
rproc_boot(), if needed.”h]”hÉ)”}”(hŒßwe're not decrementing the rproc's refcount, only the power refcount.
which means that the @rproc handle stays valid even after
rproc_shutdown() returns, and users can still use it with a subsequent
rproc_boot(), if needed.”h]”hŒãweâ€™re not decrementing the rprocâ€™s refcount, only the power refcount.
which means that the @rproc handle stays valid even after
rproc_shutdown() returns, and users can still use it with a subsequent
rproc_boot(), if needed.”…””}”(hjy  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KAhju  ubah}”(h]”h ]”h"]”h$]”h&]”uh1js  hhühžhhŸh¶h Nubj  )”}”(hŒ3struct rproc *rproc_get_by_phandle(phandle phandle)”h]”hŒ3struct rproc *rproc_get_by_phandle(phandle phandle)”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h KHhhühžhubhÉ)”}”(hŒõFind an rproc handle using a device tree phandle. Returns the rproc
handle on success, and NULL on failure. This function increments
the remote processor's refcount, so always use rproc_put() to
decrement it back once rproc isn't needed anymore.”h]”hŒùFind an rproc handle using a device tree phandle. Returns the rproc
handle on success, and NULL on failure. This function increments
the remote processorâ€™s refcount, so always use rproc_put() to
decrement it back once rproc isnâ€™t needed anymore.”…””}”(hj›  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KJhhühžhubeh}”(h]”Œuser-api”ah ]”h"]”Œuser api”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K!ubh¢)”}”(hhh]”(h§)”}”(hŒTypical usage”h]”hŒTypical usage”…””}”(hj´  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj±  hžhhŸh¶h KPubj  )”}”(hX  #include <linux/remoteproc.h>

/* in case we were given a valid 'rproc' handle */
int dummy_rproc_example(struct rproc *my_rproc)
{
      int ret;

      /* let's power on and boot our remote processor */
      ret = rproc_boot(my_rproc);
      if (ret) {
              /*
               * something went wrong. handle it and leave.
               */
      }

      /*
       * our remote processor is now powered on... give it some work
       */

      /* let's shut it down now */
      rproc_shutdown(my_rproc);
}”h]”hX  #include <linux/remoteproc.h>

/* in case we were given a valid 'rproc' handle */
int dummy_rproc_example(struct rproc *my_rproc)
{
      int ret;

      /* let's power on and boot our remote processor */
      ret = rproc_boot(my_rproc);
      if (ret) {
              /*
               * something went wrong. handle it and leave.
               */
      }

      /*
       * our remote processor is now powered on... give it some work
       */

      /* let's shut it down now */
      rproc_shutdown(my_rproc);
}”…””}”hjÂ  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h KThj±  hžhubeh}”(h]”Œtypical-usage”ah ]”h"]”Œtypical usage”ah$]”h&]”uh1h¡hh£hžhhŸh¶h KPubh¢)”}”(hhh]”(h§)”}”(hŒAPI for implementors”h]”hŒAPI for implementors”…””}”(hjÛ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjØ  hžhhŸh¶h Klubj  )”}”(hŒ·struct rproc *rproc_alloc(struct device *dev, const char *name,
                              const struct rproc_ops *ops,
                              const char *firmware, int len)”h]”hŒ·struct rproc *rproc_alloc(struct device *dev, const char *name,
                              const struct rproc_ops *ops,
                              const char *firmware, int len)”…””}”hjé  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h KphjØ  hžhubhÉ)”}”(hX7  Allocate a new remote processor handle, but don't register
it yet. Required parameters are the underlying device, the
name of this remote processor, platform-specific ops handlers,
the name of the firmware to boot this rproc with, and the
length of private data needed by the allocating rproc driver (in bytes).”h]”hX9  Allocate a new remote processor handle, but donâ€™t register
it yet. Required parameters are the underlying device, the
name of this remote processor, platform-specific ops handlers,
the name of the firmware to boot this rproc with, and the
length of private data needed by the allocating rproc driver (in bytes).”…””}”(hj÷  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KthjØ  hžhubhÉ)”}”(hŒdThis function should be used by rproc implementations during
initialization of the remote processor.”h]”hŒdThis function should be used by rproc implementations during
initialization of the remote processor.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KzhjØ  hžhubhÉ)”}”(hŒ¦After creating an rproc handle using this function, and when ready,
implementations should then call rproc_add() to complete
the registration of the remote processor.”h]”hŒ¦After creating an rproc handle using this function, and when ready,
implementations should then call rproc_add() to complete
the registration of the remote processor.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K}hjØ  hžhubhÉ)”}”(hŒ<On success, the new rproc is returned, and on failure, NULL.”h]”hŒ<On success, the new rproc is returned, and on failure, NULL.”…””}”(hj!  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhjØ  hžhubjt  )”}”(hŒŠ**never** directly deallocate @rproc, even if it was not registered
yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().”h]”hÉ)”}”(hŒŠ**never** directly deallocate @rproc, even if it was not registered
yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().”h]”(hŒstrong”“”)”}”(hŒ	**never**”h]”hŒnever”…””}”(hj9  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j7  hj3  ubhŒ directly deallocate @rproc, even if it was not registered
yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().”…””}”(hj3  hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K…hj/  ubah}”(h]”h ]”h"]”h$]”h&]”uh1js  hjØ  hžhhŸh¶h Nubj  )”}”(hŒ$void rproc_free(struct rproc *rproc)”h]”hŒ$void rproc_free(struct rproc *rproc)”…””}”hjW  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h KŠhjØ  hžhubhÉ)”}”(hŒ7Free an rproc handle that was allocated by rproc_alloc.”h]”hŒ7Free an rproc handle that was allocated by rproc_alloc.”…””}”(hje  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KŒhjØ  hžhubhÉ)”}”(hŒÝThis function essentially unrolls rproc_alloc(), by decrementing the
rproc's refcount. It doesn't directly free rproc; that would happen
only if there are no other references to rproc and its refcount now
dropped to zero.”h]”hŒáThis function essentially unrolls rproc_alloc(), by decrementing the
rprocâ€™s refcount. It doesnâ€™t directly free rproc; that would happen
only if there are no other references to rproc and its refcount now
dropped to zero.”…””}”(hjs  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KŽhjØ  hžhubj  )”}”(hŒ"int rproc_add(struct rproc *rproc)”h]”hŒ"int rproc_add(struct rproc *rproc)”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h K•hjØ  hžhubhÉ)”}”(hŒ^Register @rproc with the remoteproc framework, after it has been
allocated with rproc_alloc().”h]”hŒ^Register @rproc with the remoteproc framework, after it has been
allocated with rproc_alloc().”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K—hjØ  hžhubhÉ)”}”(hŒoThis is called by the platform-specific rproc implementation, whenever
a new remote processor device is probed.”h]”hŒoThis is called by the platform-specific rproc implementation, whenever
a new remote processor device is probed.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KšhjØ  hžhubhÉ)”}”(hŒËReturns 0 on success and an appropriate error code otherwise.
Note: this function initiates an asynchronous firmware loading
context, which will look for virtio devices supported by the rproc's
firmware.”h]”hŒÍReturns 0 on success and an appropriate error code otherwise.
Note: this function initiates an asynchronous firmware loading
context, which will look for virtio devices supported by the rprocâ€™s
firmware.”…””}”(hj«  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhjØ  hžhubhÉ)”}”(hŒšIf found, those virtio devices will be created and added, so as a result
of registering this remote processor, additional virtio drivers might get
probed.”h]”hŒšIf found, those virtio devices will be created and added, so as a result
of registering this remote processor, additional virtio drivers might get
probed.”…””}”(hj¹  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K¢hjØ  hžhubj  )”}”(hŒ"int rproc_del(struct rproc *rproc)”h]”hŒ"int rproc_del(struct rproc *rproc)”…””}”hjÇ  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h K¨hjØ  hžhubhÉ)”}”(hŒUnroll rproc_add().”h]”hŒUnroll rproc_add().”…””}”(hjÕ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KªhjØ  hžhubhÉ)”}”(hŒÑThis function should be called when the platform specific rproc
implementation decides to remove the rproc device. it should
_only_ be called if a previous invocation of rproc_add()
has completed successfully.”h]”hŒÑThis function should be called when the platform specific rproc
implementation decides to remove the rproc device. it should
_only_ be called if a previous invocation of rproc_add()
has completed successfully.”…””}”(hjã  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K¬hjØ  hžhubhÉ)”}”(hŒvAfter rproc_del() returns, @rproc is still valid, and its
last refcount should be decremented by calling rproc_free().”h]”hŒvAfter rproc_del() returns, @rproc is still valid, and its
last refcount should be decremented by calling rproc_free().”…””}”(hjñ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K±hjØ  hžhubhÉ)”}”(hŒ7Returns 0 on success and -EINVAL if @rproc isn't valid.”h]”hŒ9Returns 0 on success and -EINVAL if @rproc isnâ€™t valid.”…””}”(hjÿ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K´hjØ  hžhubj  )”}”(hŒHvoid rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)”h]”hŒHvoid rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h K¸hjØ  hžhubhÉ)”}”(hŒReport a crash in a remoteproc”h]”hŒReport a crash in a remoteproc”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KºhjØ  hžhubhÉ)”}”(hŒÝThis function must be called every time a crash is detected by the
platform specific rproc implementation. This should not be called from a
non-remoteproc driver. This function can be called from atomic/interrupt
context.”h]”hŒÝThis function must be called every time a crash is detected by the
platform specific rproc implementation. This should not be called from a
non-remoteproc driver. This function can be called from atomic/interrupt
context.”…””}”(hj)  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K¼hjØ  hžhubeh}”(h]”Œapi-for-implementors”ah ]”h"]”Œapi for implementors”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Klubh¢)”}”(hhh]”(h§)”}”(hŒImplementation callbacks”h]”hŒImplementation callbacks”…””}”(hjB  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj?  hžhhŸh¶h KÂubhÉ)”}”(hŒLThese callbacks should be provided by platform-specific remoteproc
drivers::”h]”hŒKThese callbacks should be provided by platform-specific remoteproc
drivers:”…””}”(hjP  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KÄhj?  hžhubj  )”}”(hXm  /**
 * struct rproc_ops - platform-specific device handlers
 * @start:    power on the device and boot it
 * @stop:     power off the device
 * @kick:     kick a virtqueue (virtqueue id given as a parameter)
 */
struct rproc_ops {
      int (*start)(struct rproc *rproc);
      int (*stop)(struct rproc *rproc);
      void (*kick)(struct rproc *rproc, int vqid);
};”h]”hXm  /**
 * struct rproc_ops - platform-specific device handlers
 * @start:    power on the device and boot it
 * @stop:     power off the device
 * @kick:     kick a virtqueue (virtqueue id given as a parameter)
 */
struct rproc_ops {
      int (*start)(struct rproc *rproc);
      int (*stop)(struct rproc *rproc);
      void (*kick)(struct rproc *rproc, int vqid);
};”…””}”hj^  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h KÇhj?  hžhubhÉ)”}”(hŒ»Every remoteproc implementation should at least provide the ->start and ->stop
handlers. If rpmsg/virtio functionality is also desired, then the ->kick handler
should be provided as well.”h]”hŒ»Every remoteproc implementation should at least provide the ->start and ->stop
handlers. If rpmsg/virtio functionality is also desired, then the ->kick handler
should be provided as well.”…””}”(hjl  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KÓhj?  hžhubhÉ)”}”(hXX  The ->start() handler takes an rproc handle and should then power on the
device and boot it (use rproc->priv to access platform-specific private data).
The boot address, in case needed, can be found in rproc->bootaddr (remoteproc
core puts there the ELF entry point).
On success, 0 should be returned, and on failure, an appropriate error code.”h]”hXX  The ->start() handler takes an rproc handle and should then power on the
device and boot it (use rproc->priv to access platform-specific private data).
The boot address, in case needed, can be found in rproc->bootaddr (remoteproc
core puts there the ELF entry point).
On success, 0 should be returned, and on failure, an appropriate error code.”…””}”(hjz  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K×hj?  hžhubhÉ)”}”(hŒŒThe ->stop() handler takes an rproc handle and powers the device down.
On success, 0 is returned, and on failure, an appropriate error code.”h]”hŒŒThe ->stop() handler takes an rproc handle and powers the device down.
On success, 0 is returned, and on failure, an appropriate error code.”…””}”(hjˆ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KÝhj?  hžhubhÉ)”}”(hXŠ  The ->kick() handler takes an rproc handle, and an index of a virtqueue
where new message was placed in. Implementations should interrupt the remote
processor and let it know it has pending messages. Notifying remote processors
the exact virtqueue index to look in is optional: it is easy (and not
too expensive) to go through the existing virtqueues and look for new buffers
in the used rings.”h]”hXŠ  The ->kick() handler takes an rproc handle, and an index of a virtqueue
where new message was placed in. Implementations should interrupt the remote
processor and let it know it has pending messages. Notifying remote processors
the exact virtqueue index to look in is optional: it is easy (and not
too expensive) to go through the existing virtqueues and look for new buffers
in the used rings.”…””}”(hj–  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kàhj?  hžhubeh}”(h]”Œimplementation-callbacks”ah ]”h"]”Œimplementation callbacks”ah$]”h&]”uh1h¡hh£hžhhŸh¶h KÂubh¢)”}”(hhh]”(h§)”}”(hŒBinary Firmware Structure”h]”hŒBinary Firmware Structure”…””}”(hj¯  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj¬  hžhhŸh¶h KèubhÉ)”}”(hŒÙAt this point remoteproc supports ELF32 and ELF64 firmware binaries. However,
it is quite expected that other platforms/devices which we'd want to
support with this framework will be based on different binary formats.”h]”hŒÛAt this point remoteproc supports ELF32 and ELF64 firmware binaries. However,
it is quite expected that other platforms/devices which weâ€™d want to
support with this framework will be based on different binary formats.”…””}”(hj½  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kêhj¬  hžhubhÉ)”}”(hŒ«When those use cases show up, we will have to decouple the binary format
from the framework core, so we can support several binary formats without
duplicating common code.”h]”hŒ«When those use cases show up, we will have to decouple the binary format
from the framework core, so we can support several binary formats without
duplicating common code.”…””}”(hjË  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kîhj¬  hžhubhÉ)”}”(hŒÄWhen the firmware is parsed, its various segments are loaded to memory
according to the specified device address (might be a physical address
if the remote processor is accessing memory directly).”h]”hŒÄWhen the firmware is parsed, its various segments are loaded to memory
according to the specified device address (might be a physical address
if the remote processor is accessing memory directly).”…””}”(hjÙ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kòhj¬  hžhubhÉ)”}”(hŒ‰In addition to the standard ELF segments, most remote processors would
also include a special section which we call "the resource table".”h]”hŒIn addition to the standard ELF segments, most remote processors would
also include a special section which we call â€œthe resource tableâ€.”…””}”(hjç  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Köhj¬  hžhubhÉ)”}”(hX1  The resource table contains system resources that the remote processor
requires before it should be powered on, such as allocation of physically
contiguous memory, or iommu mapping of certain on-chip peripherals.
Remotecore will only power up the device after all the resource table's
requirement are met.”h]”hX3  The resource table contains system resources that the remote processor
requires before it should be powered on, such as allocation of physically
contiguous memory, or iommu mapping of certain on-chip peripherals.
Remotecore will only power up the device after all the resource tableâ€™s
requirement are met.”…””}”(hjõ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kùhj¬  hžhubhÉ)”}”(hX   In addition to system resources, the resource table may also contain
resource entries that publish the existence of supported features
or configurations by the remote processor, such as trace buffers and
supported virtio devices (and their configurations).”h]”hX   In addition to system resources, the resource table may also contain
resource entries that publish the existence of supported features
or configurations by the remote processor, such as trace buffers and
supported virtio devices (and their configurations).”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Kÿhj¬  hžhubhÉ)”}”(hŒ,The resource table begins with this header::”h]”hŒ+The resource table begins with this header:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Mhj¬  hžhubj  )”}”(hXB  /**
 * struct resource_table - firmware resource table header
 * @ver: version number
 * @num: number of resource entries
 * @reserved: reserved (must be zero)
 * @offset: array of offsets pointing at the various resource entries
 *
 * The header of the resource table, as expressed by this structure,
 * contains a version number (should we need to change this format in the
 * future), the number of available resource entries, and their offsets
 * in the table.
 */
struct resource_table {
      u32 ver;
      u32 num;
      u32 reserved[2];
      u32 offset[0];
} __packed;”h]”hXB  /**
 * struct resource_table - firmware resource table header
 * @ver: version number
 * @num: number of resource entries
 * @reserved: reserved (must be zero)
 * @offset: array of offsets pointing at the various resource entries
 *
 * The header of the resource table, as expressed by this structure,
 * contains a version number (should we need to change this format in the
 * future), the number of available resource entries, and their offsets
 * in the table.
 */
struct resource_table {
      u32 ver;
      u32 num;
      u32 reserved[2];
      u32 offset[0];
} __packed;”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h Mhj¬  hžhubhÉ)”}”(hŒ†Immediately following this header are the resource entries themselves,
each of which begins with the following resource entry header::”h]”hŒ…Immediately following this header are the resource entries themselves,
each of which begins with the following resource entry header:”…””}”(hj-  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Mhj¬  hžhubj  )”}”(hX‹  /**
 * struct fw_rsc_hdr - firmware resource entry header
 * @type: resource type
 * @data: resource data
 *
 * Every resource entry begins with a 'struct fw_rsc_hdr' header providing
 * its @type. The content of the entry itself will immediately follow
 * this header, and it should be parsed according to the resource type.
 */
struct fw_rsc_hdr {
      u32 type;
      u8 data[0];
} __packed;”h]”hX‹  /**
 * struct fw_rsc_hdr - firmware resource entry header
 * @type: resource type
 * @data: resource data
 *
 * Every resource entry begins with a 'struct fw_rsc_hdr' header providing
 * its @type. The content of the entry itself will immediately follow
 * this header, and it should be parsed according to the resource type.
 */
struct fw_rsc_hdr {
      u32 type;
      u8 data[0];
} __packed;”…””}”hj;  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h Mhj¬  hžhubhÉ)”}”(hXy  Some resources entries are mere announcements, where the host is informed
of specific remoteproc configuration. Other entries require the host to
do something (e.g. allocate a system resource). Sometimes a negotiation
is expected, where the firmware requests a resource, and once allocated,
the host should provide back its details (e.g. address of an allocated
memory region).”h]”hXy  Some resources entries are mere announcements, where the host is informed
of specific remoteproc configuration. Other entries require the host to
do something (e.g. allocate a system resource). Sometimes a negotiation
is expected, where the firmware requests a resource, and once allocated,
the host should provide back its details (e.g. address of an allocated
memory region).”…””}”(hjI  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h M*hj¬  hžhubhÉ)”}”(hŒBHere are the various resource types that are currently supported::”h]”hŒAHere are the various resource types that are currently supported:”…””}”(hjW  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h M1hj¬  hžhubj  )”}”(hX»  /**
 * enum fw_resource_type - types of resource entries
 *
 * @RSC_CARVEOUT:   request for allocation of a physically contiguous
 *                memory region.
 * @RSC_DEVMEM:     request to iommu_map a memory-based peripheral.
 * @RSC_TRACE:            announces the availability of a trace buffer into which
 *                the remote processor will be writing logs.
 * @RSC_VDEV:       declare support for a virtio device, and serve as its
 *                virtio header.
 * @RSC_LAST:       just keep this one at the end
 * @RSC_VENDOR_START: start of the vendor specific resource types range
 * @RSC_VENDOR_END:   end of the vendor specific resource types range
 *
 * Please note that these values are used as indices to the rproc_handle_rsc
 * lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
 * check the validity of an index before the lookup table is accessed, so
 * please update it as needed.
 */
enum fw_resource_type {
      RSC_CARVEOUT            = 0,
      RSC_DEVMEM              = 1,
      RSC_TRACE               = 2,
      RSC_VDEV                = 3,
      RSC_LAST                = 4,
      RSC_VENDOR_START        = 128,
      RSC_VENDOR_END          = 512,
};”h]”hX»  /**
 * enum fw_resource_type - types of resource entries
 *
 * @RSC_CARVEOUT:   request for allocation of a physically contiguous
 *                memory region.
 * @RSC_DEVMEM:     request to iommu_map a memory-based peripheral.
 * @RSC_TRACE:            announces the availability of a trace buffer into which
 *                the remote processor will be writing logs.
 * @RSC_VDEV:       declare support for a virtio device, and serve as its
 *                virtio header.
 * @RSC_LAST:       just keep this one at the end
 * @RSC_VENDOR_START: start of the vendor specific resource types range
 * @RSC_VENDOR_END:   end of the vendor specific resource types range
 *
 * Please note that these values are used as indices to the rproc_handle_rsc
 * lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
 * check the validity of an index before the lookup table is accessed, so
 * please update it as needed.
 */
enum fw_resource_type {
      RSC_CARVEOUT            = 0,
      RSC_DEVMEM              = 1,
      RSC_TRACE               = 2,
      RSC_VDEV                = 3,
      RSC_LAST                = 4,
      RSC_VENDOR_START        = 128,
      RSC_VENDOR_END          = 512,
};”…””}”hje  sbah}”(h]”h ]”h"]”h$]”h&]”j  j  uh1j  hŸh¶h M3hj¬  hžhubhÉ)”}”(hŒvFor more details regarding a specific resource type, please see its
dedicated structure in include/linux/remoteproc.h.”h]”hŒvFor more details regarding a specific resource type, please see its
dedicated structure in include/linux/remoteproc.h.”…””}”(hjs  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h MPhj¬  hžhubhÉ)”}”(hŒÜWe also expect that platform-specific resource entries will show up
at some point. When that happens, we could easily add a new RSC_PLATFORM
type, and hand those resources to the platform-specific rproc driver to handle.”h]”hŒÜWe also expect that platform-specific resource entries will show up
at some point. When that happens, we could easily add a new RSC_PLATFORM
type, and hand those resources to the platform-specific rproc driver to handle.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h MShj¬  hžhubeh}”(h]”Œbinary-firmware-structure”ah ]”h"]”Œbinary firmware structure”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kèubh¢)”}”(hhh]”(h§)”}”(hŒVirtio and remoteproc”h]”hŒVirtio and remoteproc”…””}”(hjš  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj—  hžhhŸh¶h MXubhÉ)”}”(hX  The firmware should provide remoteproc information about virtio devices
that it supports, and their configurations: a RSC_VDEV resource entry
should specify the virtio device id (as in virtio_ids.h), virtio features,
virtio config space, vrings information, etc.”h]”hX  The firmware should provide remoteproc information about virtio devices
that it supports, and their configurations: a RSC_VDEV resource entry
should specify the virtio device id (as in virtio_ids.h), virtio features,
virtio config space, vrings information, etc.”…””}”(hj¨  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h MZhj—  hžhubhÉ)”}”(hXB  When a new remote processor is registered, the remoteproc framework
will look for its resource table and will register the virtio devices
it supports. A firmware may support any number of virtio devices, and
of any type (a single remote processor can also easily support several
rpmsg virtio devices this way, if desired).”h]”hXB  When a new remote processor is registered, the remoteproc framework
will look for its resource table and will register the virtio devices
it supports. A firmware may support any number of virtio devices, and
of any type (a single remote processor can also easily support several
rpmsg virtio devices this way, if desired).”…””}”(hj¶  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h M_hj—  hžhubhÉ)”}”(hX  Of course, RSC_VDEV resource entries are only good enough for static
allocation of virtio devices. Dynamic allocations will also be made possible
using the rpmsg bus (similar to how we already do dynamic allocations of
rpmsg channels; read more about it in rpmsg.txt).”h]”hX  Of course, RSC_VDEV resource entries are only good enough for static
allocation of virtio devices. Dynamic allocations will also be made possible
using the rpmsg bus (similar to how we already do dynamic allocations of
rpmsg channels; read more about it in rpmsg.txt).”…””}”(hjÄ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Mehj—  hžhubeh}”(h]”Œvirtio-and-remoteproc”ah ]”h"]”Œvirtio and remoteproc”ah$]”h&]”uh1h¡hh£hžhhŸh¶h MXubeh}”(h]”Œremote-processor-framework”ah ]”h"]”Œremote processor framework”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
source_url”NŒtoc_backlinks”Œentry”Œfootnote_backlinks”KŒsectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒstrip_classes”NŒreport_level”KŒ
halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ	traceback”ˆŒinput_encoding”Œ	utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”j  Œerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œlanguage_code”Œen”Œrecord_dependencies”NŒconfig”NŒ	id_prefix”hŒauto_id_prefix”Œid”Œdump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ_destination”NŒ_config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ	tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œdocinfo_xform”KŒsectsubtitle_xform”‰Œimage_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”(jß  jÜ  hùhöj®  j«  jÕ  jÒ  j<  j9  j©  j¦  j”  j‘  j×  jÔ  uŒ	nametypes”}”(jß  ‰hù‰j®  ‰jÕ  ‰j<  ‰j©  ‰j”  ‰j×  ‰uh}”(jÜ  h£höh·j«  hüjÒ  j±  j9  jØ  j¦  j?  j‘  j¬  jÔ  j—  uŒfootnote_refs”}”Œcitation_refs”}”Œautofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ	footnotes”]”Œ	citations”]”Œautofootnote_start”KŒsymbol_footnote_start”K Œ
id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
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