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remoteproc: add framework for controlling remote processors

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Modern SoCs typically employ a central symmetric multiprocessing (SMP)
application processor running Linux, with several other asymmetric
multiprocessing (AMP) heterogeneous processors running different instances
of operating system, whether Linux or any other flavor of real-time OS.

Booting a remote processor in an AMP configuration typically involves:
- Loading a firmware which contains the OS image
- Allocating and providing it required system resources (e.g. memory)
- Programming an IOMMU (when relevant)
- Powering on the device

This patch introduces a generic framework that allows drivers to do
that. In the future, this framework will also include runtime power
management and error recovery.

Based on (but now quite far from) work done by Fernando Guzman Lugo
<fernando.lugo@ti.com>.

ELF loader was written by Mark Grosen <mgrosen@ti.com>, based on
msm's Peripheral Image Loader (PIL) by Stephen Boyd <sboyd@codeaurora.org>.

Designed with Brian Swetland <swetland@google.com>.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Brian Swetland <swetland@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg KH <greg@kroah.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Ohad Ben-Cohen 2011-10-20 16:52:46 +02:00
parent dcd6c92267
commit 400e64df6b
9 changed files with 2062 additions and 0 deletions
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Remote Processor Framework
1. Introduction
Modern 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.
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.
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/rpmsg.txt).
2. User API
int rproc_boot(struct rproc *rproc)
- Boot a remote processor (i.e. load its firmware, power it on, ...).
If the remote processor is already powered on, this function immediately
returns (successfully).
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). See also
rproc_get_by_name() below.
void rproc_shutdown(struct rproc *rproc)
- Power 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.
Every call to rproc_boot() must (eventually) be accompanied by a call
to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.
Notes:
- we'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.
- don't call rproc_shutdown() to unroll rproc_get_by_name(), exactly
because rproc_shutdown() _does not_ decrement the refcount of @rproc.
To decrement the refcount of @rproc, use rproc_put() (but _only_ if
you acquired @rproc using rproc_get_by_name()).
struct rproc *rproc_get_by_name(const char *name)
- Find an rproc handle using the remote processor's name, and then
boot it. If it's already powered on, then just immediately return
(successfully). 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.
Note: currently rproc_get_by_name() and rproc_put() are not used anymore
by the rpmsg bus and its drivers. We need to scrutinize the use cases
that still need them, and see if we can migrate them to use the non
name-based boot/shutdown interface.
void rproc_put(struct rproc *rproc)
- Decrement @rproc's power refcount and shut it down if it reaches zero
(essentially by just calling rproc_shutdown), and then decrement @rproc's
validity refcount too.
After this function returns, @rproc may _not_ be used anymore, and its
handle should be considered invalid.
This function should be called _iff_ the @rproc handle was grabbed by
calling rproc_get_by_name().
3. Typical usage
#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);
}
4. API for implementors
struct rproc *rproc_alloc(struct device *dev, const char *name,
const struct rproc_ops *ops,
const char *firmware, int len)
- 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).
This function should be used by rproc implementations during
initialization of the remote processor.
After creating an rproc handle using this function, and when ready,
implementations should then call rproc_register() to complete
the registration of the remote processor.
On success, the new rproc is returned, and on failure, NULL.
Note: _never_ directly deallocate @rproc, even if it was not registered
yet. Instead, if you just need to unroll rproc_alloc(), use rproc_free().
void rproc_free(struct rproc *rproc)
- Free an rproc handle that was allocated by rproc_alloc.
This function should _only_ be used if @rproc was only allocated,
but not registered yet.
If @rproc was already successfully registered (by calling
rproc_register()), then use rproc_unregister() instead.
int rproc_register(struct rproc *rproc)
- Register @rproc with the remoteproc framework, after it has been
allocated with rproc_alloc().
This is called by the platform-specific rproc implementation, whenever
a new remote processor device is probed.
Returns 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.
If found, those virtio devices will be created and added, so as a result
of registering this remote processor, additional virtio drivers might get
probed.
Currently, though, we only support a single RPMSG virtio vdev per remote
processor.
int rproc_unregister(struct rproc *rproc)
- Unregister a remote processor, and decrement its refcount.
If its refcount drops to zero, then @rproc will be freed. If not,
it will be freed later once the last reference is dropped.
This 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_register()
has completed successfully.
After rproc_unregister() returns, @rproc is _not_ valid anymore and
it shouldn't be used. More specifically, don't call rproc_free()
or try to directly free @rproc after rproc_unregister() returns;
none of these are needed, and calling them is a bug.
Returns 0 on success and -EINVAL if @rproc isn't valid.
5. Implementation callbacks
These callbacks should be provided by platform-specific remoteproc
drivers:
/**
* 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);
};
Every remoteproc implementation should at least provide the ->start and ->stop
handlers. If rpmsg functionality is also desired, then the ->kick handler
should be provided as well.
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.
The ->stop() handler takes an rproc handle and powers the device down.
On success, 0 is returned, and on failure, an appropriate error code.
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.
6. Binary Firmware Structure
At this point remoteproc only supports ELF32 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.
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.
When 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).
In addition to the standard ELF segments, most remote processors would
also include a special section which we call "the resource table".
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.
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).
Currently the resource table is just an array of:
/**
* struct fw_resource - describes an entry from the resource section
* @type: resource type
* @id: index number of the resource
* @da: device address of the resource
* @pa: physical address of the resource
* @len: size, in bytes, of the resource
* @flags: properties of the resource, e.g. iommu protection required
* @reserved: must be 0 atm
* @name: name of resource
*/
struct fw_resource {
u32 type;
u32 id;
u64 da;
u64 pa;
u32 len;
u32 flags;
u8 reserved[16];
u8 name[48];
} __packed;
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. reserve a requested resource) and possibly also reply
by overwriting a member inside 'struct fw_resource' with info about the
allocated resource.
Different resource entries use different members of this struct,
with different meanings. This is pretty limiting and error-prone,
so the plan is to move to variable-length TLV-based resource entries,
where each resource will begin with a type and length fields, followed by
its own specific structure.
Here are the resource types that are currently being used:
/**
* 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. In this case,
* 'da' indicates the device address where logs are written to,
* and 'len' is the size of the trace buffer.
* @RSC_VRING: request for allocation of a virtio vring (address should
* be indicated in 'da', and 'len' should contain the number
* of buffers supported by the vring).
* @RSC_VIRTIO_DEV: announces support for a virtio device, and serves as
* the virtio header. 'da' contains the virtio device
* features, 'pa' holds the virtio guest features (host
* will write them here after they're negotiated), 'len'
* holds the virtio status, and 'flags' holds the virtio
* device id (currently only VIRTIO_ID_RPMSG is supported).
*/
enum fw_resource_type {
RSC_CARVEOUT = 0,
RSC_DEVMEM = 1,
RSC_TRACE = 2,
RSC_VRING = 3,
RSC_VIRTIO_DEV = 4,
RSC_VIRTIO_CFG = 5,
};
Most of the resource entries share the basic idea of address/length
negotiation with the host: the firmware usually asks for memory
of size 'len' bytes, and the host needs to allocate it and provide
the device/physical address (when relevant) in 'da'/'pa' respectively.
If the firmware is compiled with hard coded device addresses, and
can't handle dynamically allocated 'da' values, then the 'da' field
will contain the expected device addresses (today we actually only support
this scheme, as there aren't yet any use cases for dynamically allocated
device addresses).
We also expect that platform-specific resource entries will show up
at some point. When that happens, we could easily add a new RSC_PLAFORM
type, and hand those resources to the platform-specific rproc driver to handle.
7. Virtio and remoteproc
The firmware should provide remoteproc information about virtio devices
that it supports, and their configurations: a RSC_VIRTIO_DEV resource entry
should specify the virtio device id, and subsequent RSC_VRING resource entries
should indicate the vring size (i.e. how many buffers do they support) and
where should they be mapped (i.e. which device address). Note: the alignment
between the consumer and producer parts of the vring is assumed to be 4096.
At this point we only support a single virtio rpmsg device per remote
processor, but the plan is to remove this limitation. In addition, once we
move to TLV-based resource table, the plan is to have a single RSC_VIRTIO
entry per supported virtio device, which will include the virtio header,
the vrings information and the virtio config space.
Of course, RSC_VIRTIO 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).

7
MAINTAINERS
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@ -5548,6 +5548,13 @@ S: Supported
F: drivers/base/regmap/
F: include/linux/regmap.h
REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM
M: Ohad Ben-Cohen <ohad@wizery.com>
S: Maintained
F: drivers/remoteproc/
F: Documentation/remoteproc.txt
F: include/linux/remoteproc.txt
RFKILL
M: Johannes Berg <johannes@sipsolutions.net>
L: linux-wireless@vger.kernel.org

2
drivers/Kconfig
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@ -132,6 +132,8 @@ source "drivers/clocksource/Kconfig"
source "drivers/iommu/Kconfig"
source "drivers/remoteproc/Kconfig"
source "drivers/virt/Kconfig"
source "drivers/devfreq/Kconfig"

1
drivers/Makefile
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@ -126,6 +126,7 @@ obj-y += clk/
obj-$(CONFIG_HWSPINLOCK) += hwspinlock/
obj-$(CONFIG_NFC) += nfc/
obj-$(CONFIG_IOMMU_SUPPORT) += iommu/
obj-$(CONFIG_REMOTEPROC) += remoteproc/
# Virtualization drivers
obj-$(CONFIG_VIRT_DRIVERS) += virt/

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drivers/remoteproc/Kconfig Normal file
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# REMOTEPROC gets selected by whoever wants it
config REMOTEPROC
tristate

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drivers/remoteproc/Makefile Normal file
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#
# Generic framework for controlling remote processors
#
obj-$(CONFIG_REMOTEPROC) += remoteproc.o
remoteproc-y := remoteproc_core.o

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drivers/remoteproc/remoteproc_internal.h Normal file
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/*
* Remote processor framework
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef REMOTEPROC_INTERNAL_H
#define REMOTEPROC_INTERNAL_H
#include <linux/irqreturn.h>
struct rproc;
/* from remoteproc_core.c */
void rproc_release(struct kref *kref);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
/* from remoteproc_rpmsg.c */
int rproc_add_rpmsg_vdev(struct rproc *);
void rproc_remove_rpmsg_vdev(struct rproc *rproc);
/* from remoteproc_debugfs.c */
void rproc_remove_trace_file(struct dentry *tfile);
struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
struct rproc_mem_entry *trace);
void rproc_delete_debug_dir(struct rproc *rproc);
void rproc_create_debug_dir(struct rproc *rproc);
void rproc_init_debugfs(void);
void rproc_exit_debugfs(void);
#endif /* REMOTEPROC_INTERNAL_H */

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/*
* Remote Processor Framework
*
* Copyright(c) 2011 Texas Instruments, Inc.
* Copyright(c) 2011 Google, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Texas Instruments nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef REMOTEPROC_H
#define REMOTEPROC_H
#include <linux/types.h>
#include <linux/kref.h>
#include <linux/klist.h>
#include <linux/mutex.h>
#include <linux/virtio.h>
#include <linux/completion.h>
/*
* The alignment between the consumer and producer parts of the vring.
* Note: this is part of the "wire" protocol. If you change this, you need
* to update your peers too.
*/
#define AMP_VRING_ALIGN (4096)
/**
* struct fw_resource - describes an entry from the resource section
* @type: resource type
* @id: index number of the resource
* @da: device address of the resource
* @pa: physical address of the resource
* @len: size, in bytes, of the resource
* @flags: properties of the resource, e.g. iommu protection required
* @reserved: must be 0 atm
* @name: name of resource
*
* The remote processor firmware should contain a "resource table":
* array of 'struct fw_resource' entries.
*
* 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. reserve a requested resource) and possibly also reply
* by overwriting a member inside 'struct fw_resource' with info about the
* allocated resource.
*
* Different resource entries use different members of this struct,
* with different meanings. This is pretty limiting and error-prone,
* so the plan is to move to variable-length TLV-based resource entries,
* where each resource type will have its own structure.
*/
struct fw_resource {
u32 type;
u32 id;
u64 da;
u64 pa;
u32 len;
u32 flags;
u8 reserved[16];
u8 name[48];
} __packed;
/**
* 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. In this case,
* 'da' indicates the device address where logs are written to,
* and 'len' is the size of the trace buffer.
* @RSC_VRING: request for allocation of a virtio vring (address should
* be indicated in 'da', and 'len' should contain the number
* of buffers supported by the vring).
* @RSC_VIRTIO_DEV: this entry declares about support for a virtio device,
* and serves as the virtio header. 'da' holds the
* the virtio device features, 'pa' holds the virtio guest
* features, 'len' holds the virtio status, and 'flags' holds
* the virtio id (currently only VIRTIO_ID_RPMSG is supported).
*
* Most of the resource entries share the basic idea of address/length
* negotiation with the host: the firmware usually asks (on behalf of the
* remote processor that will soon be booted with it) for memory
* of size 'len' bytes, and the host needs to allocate it and provide
* the device/physical address (when relevant) in 'da'/'pa' respectively.
*
* If the firmware is compiled with hard coded device addresses, and
* can't handle dynamically allocated 'da' values, then the 'da' field
* will contain the expected device addresses (today we actually only support
* this scheme, as there aren't yet any use cases for dynamically allocated
* device addresses).
*/
enum fw_resource_type {
RSC_CARVEOUT = 0,
RSC_DEVMEM = 1,
RSC_TRACE = 2,
RSC_VRING = 3,
RSC_VIRTIO_DEV = 4,
RSC_VIRTIO_CFG = 5,
};
/**
* struct rproc_mem_entry - memory entry descriptor
* @va: virtual address
* @dma: dma address
* @len: length, in bytes
* @da: device address
* @priv: associated data
* @node: list node
*/
struct rproc_mem_entry {
void *va;
dma_addr_t dma;
int len;
u64 da;
void *priv;
struct list_head node;
};
struct rproc;
/**
* 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);
};
/**
* enum rproc_state - remote processor states
* @RPROC_OFFLINE: device is powered off
* @RPROC_SUSPENDED: device is suspended; needs to be woken up to receive
* a message.
* @RPROC_RUNNING: device is up and running
* @RPROC_CRASHED: device has crashed; need to start recovery
* @RPROC_LAST: just keep this one at the end
*
* Please note that the values of these states are used as indices
* to rproc_state_string, a state-to-name lookup table,
* so please keep the two synchronized. @RPROC_LAST is used to check
* the validity of an index before the lookup table is accessed, so
* please update it as needed too.
*/
enum rproc_state {
RPROC_OFFLINE = 0,
RPROC_SUSPENDED = 1,
RPROC_RUNNING = 2,
RPROC_CRASHED = 3,
RPROC_LAST = 4,
};
/**
* struct rproc - represents a physical remote processor device
* @node: klist node of this rproc object
* @domain: iommu domain
* @name: human readable name of the rproc
* @firmware: name of firmware file to be loaded
* @priv: private data which belongs to the platform-specific rproc module
* @ops: platform-specific start/stop rproc handlers
* @dev: underlying device
* @refcount: refcount of users that have a valid pointer to this rproc
* @power: refcount of users who need this rproc powered up
* @state: state of the device
* @lock: lock which protects concurrent manipulations of the rproc
* @dbg_dir: debugfs directory of this rproc device
* @traces: list of trace buffers
* @num_traces: number of trace buffers
* @carveouts: list of physically contiguous memory allocations
* @mappings: list of iommu mappings we initiated, needed on shutdown
* @firmware_loading_complete: marks e/o asynchronous firmware loading
* @bootaddr: address of first instruction to boot rproc with (optional)
* @rvdev: virtio device (we only support a single rpmsg virtio device for now)
*/
struct rproc {
struct klist_node node;
struct iommu_domain *domain;
const char *name;
const char *firmware;
void *priv;
const struct rproc_ops *ops;
struct device *dev;
struct kref refcount;
atomic_t power;
unsigned int state;
struct mutex lock;
struct dentry *dbg_dir;
struct list_head traces;
int num_traces;
struct list_head carveouts;
struct list_head mappings;
struct completion firmware_loading_complete;
u64 bootaddr;
struct rproc_vdev *rvdev;
};
/**
* struct rproc_vdev - remoteproc state for a supported virtio device
* @rproc: the rproc handle
* @vdev: the virio device
* @vq: the virtqueues for this vdev
* @vring: the vrings for this vdev
* @dfeatures: virtio device features
* @gfeatures: virtio guest features
*/
struct rproc_vdev {
struct rproc *rproc;
struct virtio_device vdev;
struct virtqueue *vq[2];
struct rproc_mem_entry vring[2];
unsigned long dfeatures;
unsigned long gfeatures;
};
struct rproc *rproc_get_by_name(const char *name);
void rproc_put(struct rproc *rproc);
struct rproc *rproc_alloc(struct device *dev, const char *name,
const struct rproc_ops *ops,
const char *firmware, int len);
void rproc_free(struct rproc *rproc);
int rproc_register(struct rproc *rproc);
int rproc_unregister(struct rproc *rproc);
int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = container_of(vdev, struct rproc_vdev, vdev);
return rvdev->rproc;
}
#endif /* REMOTEPROC_H */