508 lines
17 KiB
C
508 lines
17 KiB
C
/*
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* Remote Processor Framework
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*
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* Copyright(c) 2011 Texas Instruments, Inc.
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* Copyright(c) 2011 Google, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Texas Instruments nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef REMOTEPROC_H
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#define REMOTEPROC_H
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#include <linux/types.h>
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#include <linux/klist.h>
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#include <linux/mutex.h>
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#include <linux/virtio.h>
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#include <linux/completion.h>
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#include <linux/idr.h>
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/**
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* struct resource_table - firmware resource table header
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* @ver: version number
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* @num: number of resource entries
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* @reserved: reserved (must be zero)
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* @offset: array of offsets pointing at the various resource entries
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*
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* A resource table is essentially a list of system resources required
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* by the remote processor. It may also include configuration entries.
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* If needed, the remote processor firmware should contain this table
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* as a dedicated ".resource_table" ELF section.
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*
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* Some resources entries are mere announcements, where the host is informed
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* of specific remoteproc configuration. Other entries require the host to
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* do something (e.g. allocate a system resource). Sometimes a negotiation
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* is expected, where the firmware requests a resource, and once allocated,
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* the host should provide back its details (e.g. address of an allocated
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* memory region).
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*
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* The header of the resource table, as expressed by this structure,
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* contains a version number (should we need to change this format in the
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* future), the number of available resource entries, and their offsets
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* in the table.
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*
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* Immediately following this header are the resource entries themselves,
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* each of which begins with a resource entry header (as described below).
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*/
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struct resource_table {
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u32 ver;
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u32 num;
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u32 reserved[2];
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u32 offset[0];
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} __packed;
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/**
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* struct fw_rsc_hdr - firmware resource entry header
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* @type: resource type
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* @data: resource data
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*
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* Every resource entry begins with a 'struct fw_rsc_hdr' header providing
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* its @type. The content of the entry itself will immediately follow
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* this header, and it should be parsed according to the resource type.
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*/
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struct fw_rsc_hdr {
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u32 type;
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u8 data[0];
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} __packed;
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/**
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* enum fw_resource_type - types of resource entries
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*
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* @RSC_CARVEOUT: request for allocation of a physically contiguous
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* memory region.
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* @RSC_DEVMEM: request to iommu_map a memory-based peripheral.
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* @RSC_TRACE: announces the availability of a trace buffer into which
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* the remote processor will be writing logs.
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* @RSC_VDEV: declare support for a virtio device, and serve as its
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* virtio header.
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* @RSC_LAST: just keep this one at the end
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*
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* For more details regarding a specific resource type, please see its
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* dedicated structure below.
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*
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* Please note that these values are used as indices to the rproc_handle_rsc
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* lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
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* check the validity of an index before the lookup table is accessed, so
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* please update it as needed.
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*/
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enum fw_resource_type {
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RSC_CARVEOUT = 0,
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RSC_DEVMEM = 1,
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RSC_TRACE = 2,
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RSC_VDEV = 3,
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RSC_LAST = 4,
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};
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#define FW_RSC_ADDR_ANY (0xFFFFFFFFFFFFFFFF)
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/**
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* struct fw_rsc_carveout - physically contiguous memory request
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* @da: device address
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* @pa: physical address
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* @len: length (in bytes)
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* @flags: iommu protection flags
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* @reserved: reserved (must be zero)
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* @name: human-readable name of the requested memory region
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*
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* This resource entry requests the host to allocate a physically contiguous
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* memory region.
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*
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* These request entries should precede other firmware resource entries,
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* as other entries might request placing other data objects inside
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* these memory regions (e.g. data/code segments, trace resource entries, ...).
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*
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* Allocating memory this way helps utilizing the reserved physical memory
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* (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
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* needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
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* pressure is important; it may have a substantial impact on performance.
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*
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* If the firmware is compiled with static addresses, then @da should specify
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* the expected device address of this memory region. If @da is set to
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* FW_RSC_ADDR_ANY, then the host will dynamically allocate it, and then
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* overwrite @da with the dynamically allocated address.
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*
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* We will always use @da to negotiate the device addresses, even if it
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* isn't using an iommu. In that case, though, it will obviously contain
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* physical addresses.
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*
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* Some remote processors needs to know the allocated physical address
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* even if they do use an iommu. This is needed, e.g., if they control
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* hardware accelerators which access the physical memory directly (this
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* is the case with OMAP4 for instance). In that case, the host will
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* overwrite @pa with the dynamically allocated physical address.
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* Generally we don't want to expose physical addresses if we don't have to
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* (remote processors are generally _not_ trusted), so we might want to
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* change this to happen _only_ when explicitly required by the hardware.
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*
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* @flags is used to provide IOMMU protection flags, and @name should
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* (optionally) contain a human readable name of this carveout region
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* (mainly for debugging purposes).
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*/
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struct fw_rsc_carveout {
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u32 da;
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u32 pa;
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u32 len;
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u32 flags;
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u32 reserved;
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u8 name[32];
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} __packed;
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/**
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* struct fw_rsc_devmem - iommu mapping request
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* @da: device address
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* @pa: physical address
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* @len: length (in bytes)
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* @flags: iommu protection flags
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* @reserved: reserved (must be zero)
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* @name: human-readable name of the requested region to be mapped
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*
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* This resource entry requests the host to iommu map a physically contiguous
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* memory region. This is needed in case the remote processor requires
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* access to certain memory-based peripherals; _never_ use it to access
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* regular memory.
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*
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* This is obviously only needed if the remote processor is accessing memory
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* via an iommu.
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*
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* @da should specify the required device address, @pa should specify
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* the physical address we want to map, @len should specify the size of
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* the mapping and @flags is the IOMMU protection flags. As always, @name may
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* (optionally) contain a human readable name of this mapping (mainly for
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* debugging purposes).
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*
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* Note: at this point we just "trust" those devmem entries to contain valid
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* physical addresses, but this isn't safe and will be changed: eventually we
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* want remoteproc implementations to provide us ranges of physical addresses
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* the firmware is allowed to request, and not allow firmwares to request
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* access to physical addresses that are outside those ranges.
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*/
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struct fw_rsc_devmem {
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u32 da;
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u32 pa;
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u32 len;
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u32 flags;
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u32 reserved;
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u8 name[32];
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} __packed;
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/**
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* struct fw_rsc_trace - trace buffer declaration
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* @da: device address
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* @len: length (in bytes)
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* @reserved: reserved (must be zero)
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* @name: human-readable name of the trace buffer
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*
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* This resource entry provides the host information about a trace buffer
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* into which the remote processor will write log messages.
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*
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* @da specifies the device address of the buffer, @len specifies
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* its size, and @name may contain a human readable name of the trace buffer.
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*
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* After booting the remote processor, the trace buffers are exposed to the
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* user via debugfs entries (called trace0, trace1, etc..).
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*/
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struct fw_rsc_trace {
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u32 da;
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u32 len;
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u32 reserved;
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u8 name[32];
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} __packed;
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/**
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* struct fw_rsc_vdev_vring - vring descriptor entry
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* @da: device address
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* @align: the alignment between the consumer and producer parts of the vring
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* @num: num of buffers supported by this vring (must be power of two)
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* @notifyid is a unique rproc-wide notify index for this vring. This notify
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* index is used when kicking a remote processor, to let it know that this
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* vring is triggered.
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* @reserved: reserved (must be zero)
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*
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* This descriptor is not a resource entry by itself; it is part of the
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* vdev resource type (see below).
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*
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* Note that @da should either contain the device address where
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* the remote processor is expecting the vring, or indicate that
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* dynamically allocation of the vring's device address is supported.
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*/
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struct fw_rsc_vdev_vring {
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u32 da;
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u32 align;
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u32 num;
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u32 notifyid;
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u32 reserved;
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} __packed;
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/**
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* struct fw_rsc_vdev - virtio device header
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* @id: virtio device id (as in virtio_ids.h)
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* @notifyid is a unique rproc-wide notify index for this vdev. This notify
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* index is used when kicking a remote processor, to let it know that the
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* status/features of this vdev have changes.
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* @dfeatures specifies the virtio device features supported by the firmware
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* @gfeatures is a place holder used by the host to write back the
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* negotiated features that are supported by both sides.
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* @config_len is the size of the virtio config space of this vdev. The config
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* space lies in the resource table immediate after this vdev header.
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* @status is a place holder where the host will indicate its virtio progress.
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* @num_of_vrings indicates how many vrings are described in this vdev header
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* @reserved: reserved (must be zero)
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* @vring is an array of @num_of_vrings entries of 'struct fw_rsc_vdev_vring'.
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*
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* This resource is a virtio device header: it provides information about
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* the vdev, and is then used by the host and its peer remote processors
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* to negotiate and share certain virtio properties.
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*
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* By providing this resource entry, the firmware essentially asks remoteproc
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* to statically allocate a vdev upon registration of the rproc (dynamic vdev
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* allocation is not yet supported).
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*
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* Note: unlike virtualization systems, the term 'host' here means
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* the Linux side which is running remoteproc to control the remote
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* processors. We use the name 'gfeatures' to comply with virtio's terms,
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* though there isn't really any virtualized guest OS here: it's the host
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* which is responsible for negotiating the final features.
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* Yeah, it's a bit confusing.
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*
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* Note: immediately following this structure is the virtio config space for
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* this vdev (which is specific to the vdev; for more info, read the virtio
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* spec). the size of the config space is specified by @config_len.
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*/
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struct fw_rsc_vdev {
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u32 id;
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u32 notifyid;
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u32 dfeatures;
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u32 gfeatures;
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u32 config_len;
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u8 status;
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u8 num_of_vrings;
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u8 reserved[2];
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struct fw_rsc_vdev_vring vring[0];
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} __packed;
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/**
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* struct rproc_mem_entry - memory entry descriptor
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* @va: virtual address
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* @dma: dma address
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* @len: length, in bytes
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* @da: device address
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* @priv: associated data
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* @node: list node
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*/
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struct rproc_mem_entry {
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void *va;
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dma_addr_t dma;
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int len;
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u32 da;
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void *priv;
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struct list_head node;
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};
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struct rproc;
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/**
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* struct rproc_ops - platform-specific device handlers
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* @start: power on the device and boot it
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* @stop: power off the device
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* @kick: kick a virtqueue (virtqueue id given as a parameter)
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*/
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struct rproc_ops {
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int (*start)(struct rproc *rproc);
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int (*stop)(struct rproc *rproc);
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void (*kick)(struct rproc *rproc, int vqid);
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};
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/**
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* enum rproc_state - remote processor states
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* @RPROC_OFFLINE: device is powered off
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* @RPROC_SUSPENDED: device is suspended; needs to be woken up to receive
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* a message.
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* @RPROC_RUNNING: device is up and running
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* @RPROC_CRASHED: device has crashed; need to start recovery
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* @RPROC_LAST: just keep this one at the end
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*
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* Please note that the values of these states are used as indices
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* to rproc_state_string, a state-to-name lookup table,
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* so please keep the two synchronized. @RPROC_LAST is used to check
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* the validity of an index before the lookup table is accessed, so
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* please update it as needed too.
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*/
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enum rproc_state {
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RPROC_OFFLINE = 0,
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RPROC_SUSPENDED = 1,
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RPROC_RUNNING = 2,
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RPROC_CRASHED = 3,
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RPROC_LAST = 4,
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};
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/**
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* enum rproc_crash_type - remote processor crash types
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* @RPROC_MMUFAULT: iommu fault
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*
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* Each element of the enum is used as an array index. So that, the value of
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* the elements should be always something sane.
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*
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* Feel free to add more types when needed.
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*/
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enum rproc_crash_type {
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RPROC_MMUFAULT,
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};
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/**
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* struct rproc - represents a physical remote processor device
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* @node: klist node of this rproc object
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* @domain: iommu domain
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* @name: human readable name of the rproc
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* @firmware: name of firmware file to be loaded
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* @priv: private data which belongs to the platform-specific rproc module
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* @ops: platform-specific start/stop rproc handlers
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* @dev: virtual device for refcounting and common remoteproc behavior
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* @fw_ops: firmware-specific handlers
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* @power: refcount of users who need this rproc powered up
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* @state: state of the device
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* @lock: lock which protects concurrent manipulations of the rproc
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* @dbg_dir: debugfs directory of this rproc device
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* @traces: list of trace buffers
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* @num_traces: number of trace buffers
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* @carveouts: list of physically contiguous memory allocations
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* @mappings: list of iommu mappings we initiated, needed on shutdown
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* @firmware_loading_complete: marks e/o asynchronous firmware loading
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* @bootaddr: address of first instruction to boot rproc with (optional)
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* @rvdevs: list of remote virtio devices
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* @notifyids: idr for dynamically assigning rproc-wide unique notify ids
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* @index: index of this rproc device
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* @crash_handler: workqueue for handling a crash
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* @crash_cnt: crash counter
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* @crash_comp: completion used to sync crash handler and the rproc reload
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* @recovery_disabled: flag that state if recovery was disabled
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* @max_notifyid: largest allocated notify id.
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* @table_ptr: pointer to the resource table in effect
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* @cached_table: copy of the resource table
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* @table_csum: checksum of the resource table
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* @has_iommu: flag to indicate if remote processor is behind an MMU
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*/
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struct rproc {
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struct klist_node node;
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struct iommu_domain *domain;
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const char *name;
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const char *firmware;
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void *priv;
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const struct rproc_ops *ops;
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struct device dev;
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const struct rproc_fw_ops *fw_ops;
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atomic_t power;
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unsigned int state;
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struct mutex lock;
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struct dentry *dbg_dir;
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struct list_head traces;
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int num_traces;
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struct list_head carveouts;
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struct list_head mappings;
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struct completion firmware_loading_complete;
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u32 bootaddr;
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struct list_head rvdevs;
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struct idr notifyids;
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int index;
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struct work_struct crash_handler;
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unsigned crash_cnt;
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struct completion crash_comp;
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bool recovery_disabled;
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int max_notifyid;
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struct resource_table *table_ptr;
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struct resource_table *cached_table;
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u32 table_csum;
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bool has_iommu;
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};
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/* we currently support only two vrings per rvdev */
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#define RVDEV_NUM_VRINGS 2
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/**
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* struct rproc_vring - remoteproc vring state
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* @va: virtual address
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* @dma: dma address
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* @len: length, in bytes
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* @da: device address
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* @align: vring alignment
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* @notifyid: rproc-specific unique vring index
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* @rvdev: remote vdev
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* @vq: the virtqueue of this vring
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*/
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struct rproc_vring {
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void *va;
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dma_addr_t dma;
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int len;
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u32 da;
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u32 align;
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int notifyid;
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struct rproc_vdev *rvdev;
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struct virtqueue *vq;
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};
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/**
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* struct rproc_vdev - remoteproc state for a supported virtio device
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* @node: list node
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* @rproc: the rproc handle
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* @vdev: the virio device
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* @vring: the vrings for this vdev
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* @rsc_offset: offset of the vdev's resource entry
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*/
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struct rproc_vdev {
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struct list_head node;
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struct rproc *rproc;
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struct virtio_device vdev;
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struct rproc_vring vring[RVDEV_NUM_VRINGS];
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u32 rsc_offset;
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};
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struct rproc *rproc_alloc(struct device *dev, const char *name,
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const struct rproc_ops *ops,
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const char *firmware, int len);
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void rproc_put(struct rproc *rproc);
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int rproc_add(struct rproc *rproc);
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int rproc_del(struct rproc *rproc);
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int rproc_boot(struct rproc *rproc);
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void rproc_shutdown(struct rproc *rproc);
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void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
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static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
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{
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return container_of(vdev, struct rproc_vdev, vdev);
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}
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static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
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{
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struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
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return rvdev->rproc;
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}
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#endif /* REMOTEPROC_H */
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