* [PATCH v18] xen/sndif: Add sound-device ABI
@ 2017-03-20 7:03 Oleksandr Andrushchenko
2017-03-20 7:03 ` Oleksandr Andrushchenko
0 siblings, 1 reply; 3+ messages in thread
From: Oleksandr Andrushchenko @ 2017-03-20 7:03 UTC (permalink / raw)
To: xen-devel
Cc: lars.kurth, iurii.konovalenko, vlad.babchuk,
oleksandr.dmytryshyn, Oleksandr Andrushchenko, julien.grall,
andrii.anisov, olekstysh, andr2000, al1img, joculator
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Hi, all!
Please find the next version of the ABI for the PV sound
after addressing review comments.
Thank you,
Oleksandr Andrushchenko
Oleksandr Grytsov
Oleksandr Andrushchenko (1):
xen/sndif: Add sound-device ABI
xen/include/public/io/sndif.h | 803 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 803 insertions(+)
create mode 100644 xen/include/public/io/sndif.h
--
2.7.4
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v18] xen/sndif: Add sound-device ABI
2017-03-20 7:03 [PATCH v18] xen/sndif: Add sound-device ABI Oleksandr Andrushchenko
@ 2017-03-20 7:03 ` Oleksandr Andrushchenko
2017-03-28 7:57 ` Oleksandr Andrushchenko
0 siblings, 1 reply; 3+ messages in thread
From: Oleksandr Andrushchenko @ 2017-03-20 7:03 UTC (permalink / raw)
To: xen-devel
Cc: lars.kurth, iurii.konovalenko, vlad.babchuk,
oleksandr.dmytryshyn, Oleksandr Andrushchenko, julien.grall,
andrii.anisov, olekstysh, andr2000, al1img, Oleksandr Grytsov,
joculator
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Add ABI for the two halves of a para-virtualized
sound driver to communicate with each other.
The ABI allows implementing audio playback and capture as
well as volume control and possibility to mute/unmute
audio sources.
Note: depending on the use-case backend can expose more sound
cards and PCM devices/streams than the underlying HW physically
has by employing SW mixers, configuring virtual sound streams,
channels etc. Thus, allowing fine tunned configurations per
frontend.
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov@epam.com>
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
Signed-off-by: Iurii Konovalenko <iurii.konovalenko@globallogic.com>
---
Changes since v1:
* removed __attribute__((__packed__)) from all structures definitions
Changes since v2:
* removed all C structures
* added protocol description between frontend and backend drivers
Changes since v3:
* fixed some typos
* renamed XENSND_PCM_FORMAT_FLOAT_** to XENSND_PCM_FORMAT_F32_**
* renamed XENSND_PCM_FORMAT_FLOAT64_** to XENSND_PCM_FORMAT_F64_**
* added 'id' field to the request and response packets
* renamed 'stream_id' to 'stream' in the packets description
* renamed 'pcm_data_rate' to 'pcm_rate' in the packets description
* renamed 'pcm_stream_type' to 'pcm_type' in the packets description
* removed 'stream_id' field from the response packets
Changes since v4:
* renamed 'stream_id' back to the to 'stream' in the packets description
* moved 'id' field to the upper position in the response packets
Changes since v5:
* Slightly reworked request/response packets
* Size of the request/response packet is changed to the 64 bytes
* Now parameters for the XENSND_OP_SET_VOLUME/XENSND_OP_GET_VOLUME are
passed via shared page
* Added parameters for the XenBus nodes (now each stream can be mapped
to the defined sound device in the backend using those parameters)
* Added XenBus state diagrams description
Changes since v6:
* Reworked streams description in the Backend XenBus Nodes
Changes since v7:
* re-worked backend device parameters to be more generic and flexible
* extended frontend device parameters
* slightly updated state machine description added mute/unmute commands
* added constants for XenStore configuration strings
(fields, PCM formats etc.)
* changed request/response structure size from 64 octets to 16
* introduced dynamic buffer allocation instead of
static XENSND_MAX_PAGES_PER_REQUEST
* re-worked open request to allow dynamic buffer allocation
* re-worked read/write/volume requests, so they don't pass grefs:
buffer from the open request is used for these operations to pass data
* specified type of the volume value to be a signed value in steps
of 0.001 dBm, while 0 being 0dBm.
* added Linux include file with structure definitions
Changes since v8:
* changed frontend-id to frontend_id
* single sound card support, configured with bunch of
devices/streams
* clarifucation made on sample rates and formats expressed as
decimals w/o any particular ordering
* put description of migration/disconnection state
* replaced __attribute__((packed)) to __packed
* changed padding of ring structures to 64 to fit cache line
* removeed #ifdef __KERNEL
* explicitly stated which indices in XenStore configuration
are contiguous
* added description to what frontend's defaults are
* made names of virtual card/devices optional
* removed PCM_FORMAT_SPECIAL
* changed volume units from dBm to dB
Changes since v9:
* removed sndif_linux.h
* moved all structures from sndif_linux.h to sndif.h
* structures padded where needed
* fixed Hz comment
Changes since v10:
* fixed tabs to 4 spaces to comply with Xen coding style
* added placeholders to empty structures (C89 concern)
* added missing header includes
Changes since v11:
* added XENSND_RSP_NOTSUPP error code
* changed gref[0] to gref[1] with comment
* modified comments on empty structures
* removed "__" from member names
* fixed indentation
* added padding in union xensnd_resp
* changed __XEN_PUBLIC_IO_XENSND_H__ to __XEN_PUBLIC_IO_SNDIF_H__
Changes since v12:
* changed indentation for defines
* missed ";" after gref[1]
* documentation changes
* changed req/resp structures
* changed xensnd_page_directory structure
* pass buffer size in open request
Changes since v13:
* note on usage of grant ref 0
* all page sizes are XEN_PAGE_SIZE
* padding/reserved cleanup/fixes
* removed empty structures
Changes since v14:
* turn padding into reserved
Changes since v15:
* protocol description reworked
* added offset to block notations
* used -XEN_EXX for status reporting
* added protocol versioning
* removed stream_idx from the packet structure
* changed xenstore paths
Changes since v16:
* updated XenStore path pattern
* removed unused XenStore helper string constants
* renamed gref_directory_start to gref_directory
* added offset/length to volume, mute, unmute
* added note on async use-cases
* struct xensnd_rw_req is now used for read/write,
volume set/get, mute, unmute
Changes since v17:
* add recovery flow into state diagrams section
* re-position struct xensnd_rw_req in the document
* make a note on common use of xensnd_rw_req for
read/write, volume get/set, mute/unmute
* add missing string constants for XenStore "versions"
and "version" fields
* add editor's block
---
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
xen/include/public/io/sndif.h | 803 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 803 insertions(+)
create mode 100644 xen/include/public/io/sndif.h
diff --git a/xen/include/public/io/sndif.h b/xen/include/public/io/sndif.h
new file mode 100644
index 000000000000..c5c1978406b3
--- /dev/null
+++ b/xen/include/public/io/sndif.h
@@ -0,0 +1,803 @@
+/******************************************************************************
+ * sndif.h
+ *
+ * Unified sound-device I/O interface for Xen guest OSes.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (C) 2013-2015 GlobalLogic Inc.
+ * Copyright (C) 2016-2017 EPAM Systems Inc.
+ *
+ * Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
+ * Oleksandr Grytsov <oleksandr_grytsov@epam.com>
+ * Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
+ * Iurii Konovalenko <iurii.konovalenko@globallogic.com>
+ */
+
+#ifndef __XEN_PUBLIC_IO_SNDIF_H__
+#define __XEN_PUBLIC_IO_SNDIF_H__
+
+#include "ring.h"
+#include "../grant_table.h"
+
+/*
+ ******************************************************************************
+ * Feature and Parameter Negotiation
+ ******************************************************************************
+ *
+ * Front->back notifications: when enqueuing a new request, sending a
+ * notification can be made conditional on xensnd_req (i.e., the generic
+ * hold-off mechanism provided by the ring macros). Backends must set
+ * xensnd_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
+ *
+ * Back->front notifications: when enqueuing a new response, sending a
+ * notification can be made conditional on xensnd_resp (i.e., the generic
+ * hold-off mechanism provided by the ring macros). Frontends must set
+ * xensnd_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
+ *
+ * The two halves of a para-virtual sound card driver utilize nodes within
+ * XenStore to communicate capabilities and to negotiate operating parameters.
+ * This section enumerates these nodes which reside in the respective front and
+ * backend portions of XenStore, following the XenBus convention.
+ *
+ * All data in XenStore is stored as strings. Nodes specifying numeric
+ * values are encoded in decimal. Integer value ranges listed below are
+ * expressed as fixed sized integer types capable of storing the conversion
+ * of a properly formated node string, without loss of information.
+ *
+ ******************************************************************************
+ * Example configuration
+ ******************************************************************************
+ *
+ * Note: depending on the use-case backend can expose more sound cards and
+ * PCM devices/streams than the underlying HW physically has by employing
+ * SW mixers, configuring virtual sound streams, channels etc.
+ *
+ * This is an example of backend and frontend configuration:
+ *
+ *--------------------------------- Backend -----------------------------------
+ *
+ * /local/domain/0/backend/vsnd/1/0/frontend-id = "1"
+ * /local/domain/0/backend/vsnd/1/0/frontend = "/local/domain/1/device/vsnd/0"
+ * /local/domain/0/backend/vsnd/1/0/state = "4"
+ * /local/domain/0/backend/vsnd/1/0/versions = "1,2"
+ *
+ *--------------------------------- Frontend ----------------------------------
+ *
+ * /local/domain/1/device/vsnd/0/backend-id = "0"
+ * /local/domain/1/device/vsnd/0/backend = "/local/domain/0/backend/vsnd/1/0"
+ * /local/domain/1/device/vsnd/0/state = "4"
+ * /local/domain/1/device/vsnd/0/version = "1"
+ *
+ *----------------------------- Card configuration ----------------------------
+ *
+ * /local/domain/1/device/vsnd/0/short-name = "Card short name"
+ * /local/domain/1/device/vsnd/0/long-name = "Card long name"
+ * /local/domain/1/device/vsnd/0/sample-rates = "8000,32000,44100,48000,96000"
+ * /local/domain/1/device/vsnd/0/sample-formats = "s8,u8,s16_le,s16_be"
+ * /local/domain/1/device/vsnd/0/buffer-size = "262144"
+ *
+ *------------------------------- PCM device 0 --------------------------------
+ *
+ * /local/domain/1/device/vsnd/0/0/name = "General analog"
+ * /local/domain/1/device/vsnd/0/0/channels-max = "5"
+ *
+ *----------------------------- Stream 0, playback ----------------------------
+ *
+ * /local/domain/1/device/vsnd/0/0/0/type = "p"
+ * /local/domain/1/device/vsnd/0/0/0/sample-formats = "s8,u8"
+ * /local/domain/1/device/vsnd/0/0/0/unique-id = "0"
+ *
+ * /local/domain/1/device/vsnd/0/0/0/ring-ref = "386"
+ * /local/domain/1/device/vsnd/0/0/0/event-channel = "15"
+ *
+ *------------------------------ Stream 1, capture ----------------------------
+ *
+ * /local/domain/1/device/vsnd/0/0/1/type = "c"
+ * /local/domain/1/device/vsnd/0/0/1/channels-max = "2"
+ * /local/domain/1/device/vsnd/0/0/1/unique-id = "1"
+ *
+ * /local/domain/1/device/vsnd/0/0/1/ring-ref = "384"
+ * /local/domain/1/device/vsnd/0/0/1/event-channel = "13"
+ *
+ *------------------------------- PCM device 1 --------------------------------
+ *
+ * /local/domain/1/device/vsnd/0/1/name = "HDMI-0"
+ * /local/domain/1/device/vsnd/0/1/sample-rates = "8000,32000,44100"
+ *
+ *------------------------------ Stream 0, capture ----------------------------
+ *
+ * /local/domain/1/device/vsnd/0/1/0/type = "c"
+ * /local/domain/1/device/vsnd/0/1/0/unique-id = "2"
+ *
+ * /local/domain/1/device/vsnd/0/1/0/ring-ref = "387"
+ * /local/domain/1/device/vsnd/0/1/0/event-channel = "151"
+ *
+ *------------------------------- PCM device 2 --------------------------------
+ *
+ * /local/domain/1/device/vsnd/0/2/name = "SPDIF"
+ *
+ *----------------------------- Stream 0, playback ----------------------------
+ *
+ * /local/domain/1/device/vsnd/0/2/0/type = "p"
+ * /local/domain/1/device/vsnd/0/2/0/unique-id = "3"
+ *
+ * /local/domain/1/device/vsnd/0/2/0/ring-ref = "389"
+ * /local/domain/1/device/vsnd/0/2/0/event-channel = "152"
+ *
+ ******************************************************************************
+ * Backend XenBus Nodes
+ ******************************************************************************
+ *
+ *----------------------------- Protocol version ------------------------------
+ *
+ * versions
+ * Values: <string>
+ *
+ * List of XENSND_LIST_SEPARATOR separated protocol versions supported
+ * by the backend. For example "1,2,3".
+ *
+ ******************************************************************************
+ * Frontend XenBus Nodes
+ ******************************************************************************
+ *
+ *-------------------------------- Addressing ---------------------------------
+ *
+ * dom-id
+ * Values: <uint16_t>
+ *
+ * Domain identifier.
+ *
+ * dev-id
+ * Values: <uint16_t>
+ *
+ * Device identifier.
+ *
+ * pcm-dev-idx
+ * Values: <uint8_t>
+ *
+ * Zero based contigous index of the PCM device.
+ *
+ * stream-idx
+ * Values: <uint8_t>
+ *
+ * Zero based contigous index of the stream of the PCM device.
+ *
+ * The following pattern is used for addressing:
+ * /local/domain/<dom-id>/device/vsnd/<dev-id>/<pcm-dev-idx>/<stream-idx>/...
+ *
+ *----------------------------- Protocol version ------------------------------
+ *
+ * version
+ * Values: <string>
+ *
+ * Protocol version, chosen among the ones supported by the backend.
+ *
+ *------------------------------- PCM settings --------------------------------
+ *
+ * Every virtualized sound frontend has a set of PCM devices and streams, each
+ * could be individually configured. Part of the PCM configuration can be
+ * defined at higher level of the hierarchy and be fully or partially re-used
+ * by the underlying layers. These configuration values are:
+ * o number of channels (min/max)
+ * o supported sample rates
+ * o supported sample formats.
+ * E.g. one can define these values for the whole card, device or stream.
+ * Every underlying layer in turn can re-define some or all of them to better
+ * fit its needs. For example, card may define number of channels to be
+ * in [1; 8] range, and some particular stream may be limited to [1; 2] only.
+ * The rule is that the underlying layer must be a subset of the upper layer
+ * range.
+ *
+ * channels-min
+ * Values: <uint8_t>
+ *
+ * The minimum amount of channels that is supported, [1; channels-max].
+ * Optional, if not set or omitted a value of 1 is used.
+ *
+ * channels-max
+ * Values: <uint8_t>
+ *
+ * The maximum amount of channels that is supported.
+ * Must be at least <channels-min>.
+ *
+ * sample-rates
+ * Values: <list of uint32_t>
+ *
+ * List of supported sample rates separated by XENSND_LIST_SEPARATOR.
+ * Sample rates are expressed as a list of decimal values w/o any
+ * ordering requirement.
+ *
+ * sample-formats
+ * Values: <list of XENSND_PCM_FORMAT_XXX_STR>
+ *
+ * List of supported sample formats separated by XENSND_LIST_SEPARATOR.
+ * Items must not exceed XENSND_SAMPLE_FORMAT_MAX_LEN length.
+ *
+ * buffer-size
+ * Values: <uint32_t>
+ *
+ * The maximum size in octets of the buffer to allocate per stream.
+ *
+ *----------------------- Virtual sound card settings -------------------------
+ * short-name
+ * Values: <char[32]>
+ *
+ * Short name of the virtual sound card. Optional.
+ *
+ * long-name
+ * Values: <char[80]>
+ *
+ * Long name of the virtual sound card. Optional.
+ *
+ *----------------------------- Device settings -------------------------------
+ * name
+ * Values: <char[80]>
+ *
+ * Name of the sound device within the virtual sound card. Optional.
+ *
+ *----------------------------- Stream settings -------------------------------
+ *
+ * type
+ * Values: "p", "c"
+ *
+ * Stream type: "p" - playback stream, "c" - capture stream
+ *
+ * If both capture and playback are needed then two streams need to be
+ * defined under the same device.
+ *
+ * unique-id
+ * Values: <uint32_t>
+ *
+ * After stream initialization it is assigned a unique ID (within the front
+ * driver), so every stream of the frontend can be identified by the
+ * backend by this ID. This is not equal to stream-idx as the later is
+ * zero based within the device, but this index is contigous within the
+ * driver.
+ *
+ *-------------------- Stream Request Transport Parameters --------------------
+ *
+ * event-channel
+ * Values: <uint32_t>
+ *
+ * The identifier of the Xen event channel used to signal activity
+ * in the ring buffer.
+ *
+ * ring-ref
+ * Values: <uint32_t>
+ *
+ * The Xen grant reference granting permission for the backend to map
+ * a sole page in a single page sized ring buffer.
+ *
+ ******************************************************************************
+ * STATE DIAGRAMS
+ ******************************************************************************
+ *
+ * Tool stack creates front and back state nodes with initial state
+ * XenbusStateInitialising.
+ * Tool stack creates and sets up frontend sound configuration nodes per domain.
+ *
+ * Front Back
+ * ================================= =====================================
+ * XenbusStateInitialising XenbusStateInitialising
+ * o Query backend device identification
+ * data.
+ * o Open and validate backend device.
+ * |
+ * |
+ * V
+ * XenbusStateInitWait
+ *
+ * o Query frontend configuration
+ * o Allocate and initialize
+ * event channels per configured
+ * playback/capture stream.
+ * o Publish transport parameters
+ * that will be in effect during
+ * this connection.
+ * |
+ * |
+ * V
+ * XenbusStateInitialised
+ *
+ * o Query frontend transport parameters.
+ * o Connect to the event channels.
+ * |
+ * |
+ * V
+ * XenbusStateConnected
+ *
+ * o Create and initialize OS
+ * virtual sound device instances
+ * as per configuration.
+ * |
+ * |
+ * V
+ * XenbusStateConnected
+ *
+ * XenbusStateUnknown
+ * XenbusStateClosed
+ * XenbusStateClosing
+ * o Remove virtual sound device
+ * o Remove event channels
+ * |
+ * |
+ * V
+ * XenbusStateClosed
+ *
+ *------------------------------- Recovery flow -------------------------------
+ *
+ * In case of frontend unrecoverable errors backend handles that as
+ * if frontend goes into the XenbusStateClosed state.
+ *
+ * In case of backend unrecoverable errors frontend tries removing
+ * the virtualized device. If this is possible at the moment of error,
+ * then frontend goes into the XenbusStateInitialising state and is ready for
+ * new connection with backend. If the virtualized device is still in use and
+ * cannot be removed, then frontend goes into the XenbusStateReconfiguring state
+ * until either the virtualized device removed or backend initiates a new
+ * connection. On the virtualized device removal frontend goes into the
+ * XenbusStateInitialising state.
+ *
+ * Note on XenbusStateReconfiguring state of the frontend: if backend has
+ * unrecoverable errors then frontend cannot send requests to the backend
+ * and thus cannot provide functionality of the virtualized device anymore.
+ * After backend is back to normal the virtualized device may still hold some
+ * state: configuration in use, allocated buffers, client application state etc.
+ * So, in most cases, this will require frontend to implement complex recovery
+ * reconnect logic. Instead, by going into XenbusStateReconfiguring state,
+ * frontend will make sure no new clients of the virtualized device are
+ * accepted, allow existing client(s) to exit gracefully by signaling error
+ * state etc.
+ * Once all the clients are gone frontend can reinitialize the virtualized
+ * device and get into XenbusStateInitialising state again signaling the
+ * backend that a new connection can be made.
+ *
+ * There are multiple conditions possible under which frontend will go from
+ * XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
+ * specific. For example:
+ * 1. The underlying OS framework may provide callbacks to signal that the last
+ * client of the virtualized device has gone and the device can be removed
+ * 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
+ * to periodically check if this is the right time to re-try removal of
+ * the virtualized device.
+ * 3. By any other means.
+ *
+ ******************************************************************************
+ * PCM FORMATS
+ ******************************************************************************
+ *
+ * XENSND_PCM_FORMAT_<format>[_<endian>]
+ *
+ * format: <S/U/F><bits> or <name>
+ * S - signed, U - unsigned, F - float
+ * bits - 8, 16, 24, 32
+ * name - MU_LAW, GSM, etc.
+ *
+ * endian: <LE/BE>, may be absent
+ * LE - Little endian, BE - Big endian
+ */
+#define XENSND_PCM_FORMAT_S8 0
+#define XENSND_PCM_FORMAT_U8 1
+#define XENSND_PCM_FORMAT_S16_LE 2
+#define XENSND_PCM_FORMAT_S16_BE 3
+#define XENSND_PCM_FORMAT_U16_LE 4
+#define XENSND_PCM_FORMAT_U16_BE 5
+#define XENSND_PCM_FORMAT_S24_LE 6
+#define XENSND_PCM_FORMAT_S24_BE 7
+#define XENSND_PCM_FORMAT_U24_LE 8
+#define XENSND_PCM_FORMAT_U24_BE 9
+#define XENSND_PCM_FORMAT_S32_LE 10
+#define XENSND_PCM_FORMAT_S32_BE 11
+#define XENSND_PCM_FORMAT_U32_LE 12
+#define XENSND_PCM_FORMAT_U32_BE 13
+#define XENSND_PCM_FORMAT_F32_LE 14 /* 4-byte float, IEEE-754 32-bit, */
+#define XENSND_PCM_FORMAT_F32_BE 15 /* range -1.0 to 1.0 */
+#define XENSND_PCM_FORMAT_F64_LE 16 /* 8-byte float, IEEE-754 64-bit, */
+#define XENSND_PCM_FORMAT_F64_BE 17 /* range -1.0 to 1.0 */
+#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE 18
+#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE 19
+#define XENSND_PCM_FORMAT_MU_LAW 20
+#define XENSND_PCM_FORMAT_A_LAW 21
+#define XENSND_PCM_FORMAT_IMA_ADPCM 22
+#define XENSND_PCM_FORMAT_MPEG 23
+#define XENSND_PCM_FORMAT_GSM 24
+
+/*
+ ******************************************************************************
+ * REQUEST CODES
+ ******************************************************************************
+ */
+#define XENSND_OP_OPEN 0
+#define XENSND_OP_CLOSE 1
+#define XENSND_OP_READ 2
+#define XENSND_OP_WRITE 3
+#define XENSND_OP_SET_VOLUME 4
+#define XENSND_OP_GET_VOLUME 5
+#define XENSND_OP_MUTE 6
+#define XENSND_OP_UNMUTE 7
+
+/*
+ ******************************************************************************
+ * XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
+ ******************************************************************************
+ */
+#define XENSND_DRIVER_NAME "vsnd"
+
+#define XENSND_LIST_SEPARATOR ","
+/* Field names */
+#define XENSND_FIELD_BE_VERSIONS "versions"
+#define XENSND_FIELD_FE_VERSION "version"
+#define XENSND_FIELD_VCARD_SHORT_NAME "short-name"
+#define XENSND_FIELD_VCARD_LONG_NAME "long-name"
+#define XENSND_FIELD_RING_REF "ring-ref"
+#define XENSND_FIELD_EVT_CHNL "event-channel"
+#define XENSND_FIELD_DEVICE_NAME "name"
+#define XENSND_FIELD_TYPE "type"
+#define XENSND_FIELD_STREAM_UNIQUE_ID "unique-id"
+#define XENSND_FIELD_CHANNELS_MIN "channels-min"
+#define XENSND_FIELD_CHANNELS_MAX "channels-max"
+#define XENSND_FIELD_SAMPLE_RATES "sample-rates"
+#define XENSND_FIELD_SAMPLE_FORMATS "sample-formats"
+#define XENSND_FIELD_BUFFER_SIZE "buffer-size"
+
+/* Stream type field values. */
+#define XENSND_STREAM_TYPE_PLAYBACK "p"
+#define XENSND_STREAM_TYPE_CAPTURE "c"
+/* Sample rate max string length */
+#define XENSND_SAMPLE_RATE_MAX_LEN 11
+/* Sample format field values */
+#define XENSND_SAMPLE_FORMAT_MAX_LEN 24
+
+#define XENSND_PCM_FORMAT_S8_STR "s8"
+#define XENSND_PCM_FORMAT_U8_STR "u8"
+#define XENSND_PCM_FORMAT_S16_LE_STR "s16_le"
+#define XENSND_PCM_FORMAT_S16_BE_STR "s16_be"
+#define XENSND_PCM_FORMAT_U16_LE_STR "u16_le"
+#define XENSND_PCM_FORMAT_U16_BE_STR "u16_be"
+#define XENSND_PCM_FORMAT_S24_LE_STR "s24_le"
+#define XENSND_PCM_FORMAT_S24_BE_STR "s24_be"
+#define XENSND_PCM_FORMAT_U24_LE_STR "u24_le"
+#define XENSND_PCM_FORMAT_U24_BE_STR "u24_be"
+#define XENSND_PCM_FORMAT_S32_LE_STR "s32_le"
+#define XENSND_PCM_FORMAT_S32_BE_STR "s32_be"
+#define XENSND_PCM_FORMAT_U32_LE_STR "u32_le"
+#define XENSND_PCM_FORMAT_U32_BE_STR "u32_be"
+#define XENSND_PCM_FORMAT_F32_LE_STR "float_le"
+#define XENSND_PCM_FORMAT_F32_BE_STR "float_be"
+#define XENSND_PCM_FORMAT_F64_LE_STR "float64_le"
+#define XENSND_PCM_FORMAT_F64_BE_STR "float64_be"
+#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE_STR "iec958_subframe_le"
+#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE_STR "iec958_subframe_be"
+#define XENSND_PCM_FORMAT_MU_LAW_STR "mu_law"
+#define XENSND_PCM_FORMAT_A_LAW_STR "a_law"
+#define XENSND_PCM_FORMAT_IMA_ADPCM_STR "ima_adpcm"
+#define XENSND_PCM_FORMAT_MPEG_STR "mpeg"
+#define XENSND_PCM_FORMAT_GSM_STR "gsm"
+
+
+/*
+ ******************************************************************************
+ * STATUS RETURN CODES
+ ******************************************************************************
+ *
+ * Status return code is zero on success and -XEN_EXX on failure.
+ *
+ ******************************************************************************
+ * Assumptions
+ ******************************************************************************
+ * o usage of grant reference 0 as invalid grant reference:
+ * grant reference 0 is valid, but never exposed to a PV driver,
+ * because of the fact it is already in use/reserved by the PV console.
+ * o all references in this document to page sizes must be treated
+ * as pages of size XEN_PAGE_SIZE unless otherwise noted.
+ *
+ ******************************************************************************
+ * Description of the protocol between frontend and backend driver
+ ******************************************************************************
+ *
+ * The two halves of a Para-virtual sound driver communicate with
+ * each other using shared pages and event channels.
+ * Shared page contains a ring with request/response packets.
+ *
+ * Packets, used for input/output operations, e.g. read/write, set/get volume,
+ * etc., provide offset/length fields in order to allow asynchronous protocol
+ * operation with buffer space sharing: part of the buffer allocated at
+ * XENSND_OP_OPEN can be used for audio samples and part, for example,
+ * for volume control.
+ *
+ * All reserved fields in the structures below must be 0.
+ *
+ *---------------------------------- Requests ---------------------------------
+ *
+ * All request packets have the same length (32 octets)
+ * All request packets have common header:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | operation | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * id - uint16_t, private guest value, echoed in response
+ * operation - uint8_t, operation code, XENSND_OP_???
+ *
+ * For all packets which use offset and length:
+ * offset - uint32_t, read or write data offset within the shared buffer,
+ * passed with XENSND_OP_OPEN request, octets,
+ * [0; XENSND_OP_OPEN.buffer_sz - 1].
+ * length - uint32_t, read or write data length, octets
+ *
+ * Request open - open a PCM stream for playback or capture:
+ *
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | XENSND_OP_OPEN | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * | pcm_rate | 12
+ * +----------------+----------------+----------------+----------------+
+ * | pcm_format | pcm_channels | reserved | 16
+ * +----------------+----------------+----------------+----------------+
+ * | buffer_sz | 20
+ * +----------------+----------------+----------------+----------------+
+ * | gref_directory | 24
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 28
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * pcm_rate - uint32_t, stream data rate, Hz
+ * pcm_format - uint8_t, XENSND_PCM_FORMAT_XXX value
+ * pcm_channels - uint8_t, number of channels of this stream,
+ * [channels-min; channels-max]
+ * buffer_sz - uint32_t, buffer size to be allocated, octets
+ * gref_directory - grant_ref_t, a reference to the first shared page
+ * describing shared buffer references. At least one page exists. If shared
+ * buffer size (buffer_sz) exceeds what can be addressed by this single page,
+ * then reference to the next page must be supplied (see gref_dir_next_page
+ * below)
+ */
+
+struct xensnd_open_req {
+ uint32_t pcm_rate;
+ uint8_t pcm_format;
+ uint8_t pcm_channels;
+ uint16_t reserved;
+ uint32_t buffer_sz;
+ grant_ref_t gref_directory;
+};
+
+/*
+ * Shared page for XENSND_OP_OPEN buffer descriptor (gref_directory in the
+ * request) employs a list of pages, describing all pages of the shared data
+ * buffer:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | gref_dir_next_page | 4
+ * +----------------+----------------+----------------+----------------+
+ * | gref[0] | 8
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | gref[i] | i*4+8
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | gref[N - 1] | N*4+8
+ * +----------------+----------------+----------------+----------------+
+ *
+ * gref_dir_next_page - grant_ref_t, reference to the next page describing
+ * page directory. Must be 0 if there are no more pages in the list.
+ * gref[i] - grant_ref_t, reference to a shared page of the buffer
+ * allocated at XENSND_OP_OPEN
+ *
+ * Number of grant_ref_t entries in the whole page directory is not
+ * passed, but instead can be calculated as:
+ * num_grefs_total = (XENSND_OP_OPEN.buffer_sz + XEN_PAGE_SIZE - 1) /
+ * XEN_PAGE_SIZE
+ */
+
+struct xensnd_page_directory {
+ grant_ref_t gref_dir_next_page;
+ grant_ref_t gref[1]; /* Variable length */
+};
+
+/*
+ * Request close - close an opened pcm stream:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | XENSND_OP_CLOSE| reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * Request read/write - used for read (for capture) or write (for playback):
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | operation | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * | offset | 12
+ * +----------------+----------------+----------------+----------------+
+ * | length | 16
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 20
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * operation - XENSND_OP_READ for read or XENSND_OP_WRITE for write
+ */
+
+struct xensnd_rw_req {
+ uint32_t offset;
+ uint32_t length;
+};
+
+/*
+ * Request set/get volume - set/get channels' volume of the stream given:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | operation | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * | offset | 12
+ * +----------------+----------------+----------------+----------------+
+ * | length | 16
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * operation - XENSND_OP_SET_VOLUME for volume set
+ * or XENSND_OP_GET_VOLUME for volume get
+ * Buffer passed with XENSND_OP_OPEN is used to exchange volume
+ * values:
+ *
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | channel[0] | 4
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | channel[i] | i*4
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | channel[N - 1] | (N-1)*4
+ * +----------------+----------------+----------------+----------------+
+ *
+ * N = XENSND_OP_OPEN.pcm_channels
+ * i - uint8_t, index of a channel
+ * channel[i] - sint32_t, volume of i-th channel
+ * Volume is expressed as a signed value in steps of 0.001 dB,
+ * while 0 being 0 dB.
+ *
+ * Request mute/unmute - mute/unmute stream:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | operation | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 8
+ * +----------------+----------------+----------------+----------------+
+ * | offset | 12
+ * +----------------+----------------+----------------+----------------+
+ * | length | 16
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * operation - XENSND_OP_MUTE for mute or XENSND_OP_UNMUTE for unmute
+ * Buffer passed with XENSND_OP_OPEN is used to exchange mute/unmute
+ * values:
+ *
+ * 0 octet
+ * +----------------+----------------+----------------+----------------+
+ * | channel[0] | 4
+ * +----------------+----------------+----------------+----------------+
+ * +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | channel[i] | i*4
+ * +----------------+----------------+----------------+----------------+
+ * +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | channel[N - 1] | (N-1)*4
+ * +----------------+----------------+----------------+----------------+
+ *
+ * N = XENSND_OP_OPEN.pcm_channels
+ * i - uint8_t, index of a channel
+ * channel[i] - uint8_t, non-zero if i-th channel needs to be muted/unmuted
+ *
+ *------------------------------------ N.B. -----------------------------------
+ *
+ * The 'struct xensnd_rw_req' is also used for XENSND_OP_SET_VOLUME,
+ * XENSND_OP_GET_VOLUME, XENSND_OP_MUTE, XENSND_OP_UNMUTE.
+ */
+
+/*
+ *---------------------------------- Responses --------------------------------
+ *
+ * All response packets have the same length (32 octets)
+ *
+ * Response for all requests:
+ * 0 1 2 3 octet
+ * +----------------+----------------+----------------+----------------+
+ * | id | operation | reserved | 4
+ * +----------------+----------------+----------------+----------------+
+ * | status | 8
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 12
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * | reserved | 32
+ * +----------------+----------------+----------------+----------------+
+ *
+ * id - uint16_t, copied from the request
+ * operation - uint8_t, XENSND_OP_* - copied from request
+ * status - int32_t, response status, zero on success and -XEN_EXX on failure
+ */
+
+struct xensnd_req {
+ uint16_t id;
+ uint8_t operation;
+ uint8_t reserved[5];
+ union {
+ struct xensnd_open_req open;
+ struct xensnd_rw_req rw;
+ uint8_t reserved[24];
+ } op;
+};
+
+struct xensnd_resp {
+ uint16_t id;
+ uint8_t operation;
+ uint8_t reserved;
+ int32_t status;
+ uint8_t reserved1[24];
+};
+
+DEFINE_RING_TYPES(xen_sndif, struct xensnd_req, struct xensnd_resp);
+
+#endif /* __XEN_PUBLIC_IO_SNDIF_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.7.4
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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v18] xen/sndif: Add sound-device ABI
2017-03-20 7:03 ` Oleksandr Andrushchenko
@ 2017-03-28 7:57 ` Oleksandr Andrushchenko
0 siblings, 0 replies; 3+ messages in thread
From: Oleksandr Andrushchenko @ 2017-03-28 7:57 UTC (permalink / raw)
To: xen-devel
Cc: lars.kurth, iurii.konovalenko, vlad.babchuk,
oleksandr.dmytryshyn, Oleksandr Andrushchenko, julien.grall,
andrii.anisov, olekstysh, al1img, Oleksandr Grytsov, joculator
ping
On 03/20/2017 09:03 AM, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
> Add ABI for the two halves of a para-virtualized
> sound driver to communicate with each other.
>
> The ABI allows implementing audio playback and capture as
> well as volume control and possibility to mute/unmute
> audio sources.
>
> Note: depending on the use-case backend can expose more sound
> cards and PCM devices/streams than the underlying HW physically
> has by employing SW mixers, configuring virtual sound streams,
> channels etc. Thus, allowing fine tunned configurations per
> frontend.
>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov@epam.com>
> Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
> Signed-off-by: Iurii Konovalenko <iurii.konovalenko@globallogic.com>
>
> ---
> Changes since v1:
> * removed __attribute__((__packed__)) from all structures definitions
>
> Changes since v2:
> * removed all C structures
> * added protocol description between frontend and backend drivers
>
> Changes since v3:
> * fixed some typos
> * renamed XENSND_PCM_FORMAT_FLOAT_** to XENSND_PCM_FORMAT_F32_**
> * renamed XENSND_PCM_FORMAT_FLOAT64_** to XENSND_PCM_FORMAT_F64_**
> * added 'id' field to the request and response packets
> * renamed 'stream_id' to 'stream' in the packets description
> * renamed 'pcm_data_rate' to 'pcm_rate' in the packets description
> * renamed 'pcm_stream_type' to 'pcm_type' in the packets description
> * removed 'stream_id' field from the response packets
>
> Changes since v4:
> * renamed 'stream_id' back to the to 'stream' in the packets description
> * moved 'id' field to the upper position in the response packets
>
> Changes since v5:
> * Slightly reworked request/response packets
> * Size of the request/response packet is changed to the 64 bytes
> * Now parameters for the XENSND_OP_SET_VOLUME/XENSND_OP_GET_VOLUME are
> passed via shared page
> * Added parameters for the XenBus nodes (now each stream can be mapped
> to the defined sound device in the backend using those parameters)
> * Added XenBus state diagrams description
>
> Changes since v6:
> * Reworked streams description in the Backend XenBus Nodes
>
> Changes since v7:
> * re-worked backend device parameters to be more generic and flexible
> * extended frontend device parameters
> * slightly updated state machine description added mute/unmute commands
> * added constants for XenStore configuration strings
> (fields, PCM formats etc.)
> * changed request/response structure size from 64 octets to 16
> * introduced dynamic buffer allocation instead of
> static XENSND_MAX_PAGES_PER_REQUEST
> * re-worked open request to allow dynamic buffer allocation
> * re-worked read/write/volume requests, so they don't pass grefs:
> buffer from the open request is used for these operations to pass data
> * specified type of the volume value to be a signed value in steps
> of 0.001 dBm, while 0 being 0dBm.
> * added Linux include file with structure definitions
>
> Changes since v8:
> * changed frontend-id to frontend_id
> * single sound card support, configured with bunch of
> devices/streams
> * clarifucation made on sample rates and formats expressed as
> decimals w/o any particular ordering
> * put description of migration/disconnection state
> * replaced __attribute__((packed)) to __packed
> * changed padding of ring structures to 64 to fit cache line
> * removeed #ifdef __KERNEL
> * explicitly stated which indices in XenStore configuration
> are contiguous
> * added description to what frontend's defaults are
> * made names of virtual card/devices optional
> * removed PCM_FORMAT_SPECIAL
> * changed volume units from dBm to dB
>
> Changes since v9:
> * removed sndif_linux.h
> * moved all structures from sndif_linux.h to sndif.h
> * structures padded where needed
> * fixed Hz comment
>
> Changes since v10:
> * fixed tabs to 4 spaces to comply with Xen coding style
> * added placeholders to empty structures (C89 concern)
> * added missing header includes
>
> Changes since v11:
> * added XENSND_RSP_NOTSUPP error code
> * changed gref[0] to gref[1] with comment
> * modified comments on empty structures
> * removed "__" from member names
> * fixed indentation
> * added padding in union xensnd_resp
> * changed __XEN_PUBLIC_IO_XENSND_H__ to __XEN_PUBLIC_IO_SNDIF_H__
>
> Changes since v12:
> * changed indentation for defines
> * missed ";" after gref[1]
> * documentation changes
> * changed req/resp structures
> * changed xensnd_page_directory structure
> * pass buffer size in open request
>
> Changes since v13:
> * note on usage of grant ref 0
> * all page sizes are XEN_PAGE_SIZE
> * padding/reserved cleanup/fixes
> * removed empty structures
>
> Changes since v14:
> * turn padding into reserved
>
> Changes since v15:
> * protocol description reworked
> * added offset to block notations
> * used -XEN_EXX for status reporting
> * added protocol versioning
> * removed stream_idx from the packet structure
> * changed xenstore paths
>
> Changes since v16:
> * updated XenStore path pattern
> * removed unused XenStore helper string constants
> * renamed gref_directory_start to gref_directory
> * added offset/length to volume, mute, unmute
> * added note on async use-cases
> * struct xensnd_rw_req is now used for read/write,
> volume set/get, mute, unmute
>
> Changes since v17:
> * add recovery flow into state diagrams section
> * re-position struct xensnd_rw_req in the document
> * make a note on common use of xensnd_rw_req for
> read/write, volume get/set, mute/unmute
> * add missing string constants for XenStore "versions"
> and "version" fields
> * add editor's block
> ---
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> ---
> xen/include/public/io/sndif.h | 803 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 803 insertions(+)
> create mode 100644 xen/include/public/io/sndif.h
>
> diff --git a/xen/include/public/io/sndif.h b/xen/include/public/io/sndif.h
> new file mode 100644
> index 000000000000..c5c1978406b3
> --- /dev/null
> +++ b/xen/include/public/io/sndif.h
> @@ -0,0 +1,803 @@
> +/******************************************************************************
> + * sndif.h
> + *
> + * Unified sound-device I/O interface for Xen guest OSes.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (C) 2013-2015 GlobalLogic Inc.
> + * Copyright (C) 2016-2017 EPAM Systems Inc.
> + *
> + * Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> + * Oleksandr Grytsov <oleksandr_grytsov@epam.com>
> + * Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
> + * Iurii Konovalenko <iurii.konovalenko@globallogic.com>
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_SNDIF_H__
> +#define __XEN_PUBLIC_IO_SNDIF_H__
> +
> +#include "ring.h"
> +#include "../grant_table.h"
> +
> +/*
> + ******************************************************************************
> + * Feature and Parameter Negotiation
> + ******************************************************************************
> + *
> + * Front->back notifications: when enqueuing a new request, sending a
> + * notification can be made conditional on xensnd_req (i.e., the generic
> + * hold-off mechanism provided by the ring macros). Backends must set
> + * xensnd_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
> + *
> + * Back->front notifications: when enqueuing a new response, sending a
> + * notification can be made conditional on xensnd_resp (i.e., the generic
> + * hold-off mechanism provided by the ring macros). Frontends must set
> + * xensnd_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
> + *
> + * The two halves of a para-virtual sound card driver utilize nodes within
> + * XenStore to communicate capabilities and to negotiate operating parameters.
> + * This section enumerates these nodes which reside in the respective front and
> + * backend portions of XenStore, following the XenBus convention.
> + *
> + * All data in XenStore is stored as strings. Nodes specifying numeric
> + * values are encoded in decimal. Integer value ranges listed below are
> + * expressed as fixed sized integer types capable of storing the conversion
> + * of a properly formated node string, without loss of information.
> + *
> + ******************************************************************************
> + * Example configuration
> + ******************************************************************************
> + *
> + * Note: depending on the use-case backend can expose more sound cards and
> + * PCM devices/streams than the underlying HW physically has by employing
> + * SW mixers, configuring virtual sound streams, channels etc.
> + *
> + * This is an example of backend and frontend configuration:
> + *
> + *--------------------------------- Backend -----------------------------------
> + *
> + * /local/domain/0/backend/vsnd/1/0/frontend-id = "1"
> + * /local/domain/0/backend/vsnd/1/0/frontend = "/local/domain/1/device/vsnd/0"
> + * /local/domain/0/backend/vsnd/1/0/state = "4"
> + * /local/domain/0/backend/vsnd/1/0/versions = "1,2"
> + *
> + *--------------------------------- Frontend ----------------------------------
> + *
> + * /local/domain/1/device/vsnd/0/backend-id = "0"
> + * /local/domain/1/device/vsnd/0/backend = "/local/domain/0/backend/vsnd/1/0"
> + * /local/domain/1/device/vsnd/0/state = "4"
> + * /local/domain/1/device/vsnd/0/version = "1"
> + *
> + *----------------------------- Card configuration ----------------------------
> + *
> + * /local/domain/1/device/vsnd/0/short-name = "Card short name"
> + * /local/domain/1/device/vsnd/0/long-name = "Card long name"
> + * /local/domain/1/device/vsnd/0/sample-rates = "8000,32000,44100,48000,96000"
> + * /local/domain/1/device/vsnd/0/sample-formats = "s8,u8,s16_le,s16_be"
> + * /local/domain/1/device/vsnd/0/buffer-size = "262144"
> + *
> + *------------------------------- PCM device 0 --------------------------------
> + *
> + * /local/domain/1/device/vsnd/0/0/name = "General analog"
> + * /local/domain/1/device/vsnd/0/0/channels-max = "5"
> + *
> + *----------------------------- Stream 0, playback ----------------------------
> + *
> + * /local/domain/1/device/vsnd/0/0/0/type = "p"
> + * /local/domain/1/device/vsnd/0/0/0/sample-formats = "s8,u8"
> + * /local/domain/1/device/vsnd/0/0/0/unique-id = "0"
> + *
> + * /local/domain/1/device/vsnd/0/0/0/ring-ref = "386"
> + * /local/domain/1/device/vsnd/0/0/0/event-channel = "15"
> + *
> + *------------------------------ Stream 1, capture ----------------------------
> + *
> + * /local/domain/1/device/vsnd/0/0/1/type = "c"
> + * /local/domain/1/device/vsnd/0/0/1/channels-max = "2"
> + * /local/domain/1/device/vsnd/0/0/1/unique-id = "1"
> + *
> + * /local/domain/1/device/vsnd/0/0/1/ring-ref = "384"
> + * /local/domain/1/device/vsnd/0/0/1/event-channel = "13"
> + *
> + *------------------------------- PCM device 1 --------------------------------
> + *
> + * /local/domain/1/device/vsnd/0/1/name = "HDMI-0"
> + * /local/domain/1/device/vsnd/0/1/sample-rates = "8000,32000,44100"
> + *
> + *------------------------------ Stream 0, capture ----------------------------
> + *
> + * /local/domain/1/device/vsnd/0/1/0/type = "c"
> + * /local/domain/1/device/vsnd/0/1/0/unique-id = "2"
> + *
> + * /local/domain/1/device/vsnd/0/1/0/ring-ref = "387"
> + * /local/domain/1/device/vsnd/0/1/0/event-channel = "151"
> + *
> + *------------------------------- PCM device 2 --------------------------------
> + *
> + * /local/domain/1/device/vsnd/0/2/name = "SPDIF"
> + *
> + *----------------------------- Stream 0, playback ----------------------------
> + *
> + * /local/domain/1/device/vsnd/0/2/0/type = "p"
> + * /local/domain/1/device/vsnd/0/2/0/unique-id = "3"
> + *
> + * /local/domain/1/device/vsnd/0/2/0/ring-ref = "389"
> + * /local/domain/1/device/vsnd/0/2/0/event-channel = "152"
> + *
> + ******************************************************************************
> + * Backend XenBus Nodes
> + ******************************************************************************
> + *
> + *----------------------------- Protocol version ------------------------------
> + *
> + * versions
> + * Values: <string>
> + *
> + * List of XENSND_LIST_SEPARATOR separated protocol versions supported
> + * by the backend. For example "1,2,3".
> + *
> + ******************************************************************************
> + * Frontend XenBus Nodes
> + ******************************************************************************
> + *
> + *-------------------------------- Addressing ---------------------------------
> + *
> + * dom-id
> + * Values: <uint16_t>
> + *
> + * Domain identifier.
> + *
> + * dev-id
> + * Values: <uint16_t>
> + *
> + * Device identifier.
> + *
> + * pcm-dev-idx
> + * Values: <uint8_t>
> + *
> + * Zero based contigous index of the PCM device.
> + *
> + * stream-idx
> + * Values: <uint8_t>
> + *
> + * Zero based contigous index of the stream of the PCM device.
> + *
> + * The following pattern is used for addressing:
> + * /local/domain/<dom-id>/device/vsnd/<dev-id>/<pcm-dev-idx>/<stream-idx>/...
> + *
> + *----------------------------- Protocol version ------------------------------
> + *
> + * version
> + * Values: <string>
> + *
> + * Protocol version, chosen among the ones supported by the backend.
> + *
> + *------------------------------- PCM settings --------------------------------
> + *
> + * Every virtualized sound frontend has a set of PCM devices and streams, each
> + * could be individually configured. Part of the PCM configuration can be
> + * defined at higher level of the hierarchy and be fully or partially re-used
> + * by the underlying layers. These configuration values are:
> + * o number of channels (min/max)
> + * o supported sample rates
> + * o supported sample formats.
> + * E.g. one can define these values for the whole card, device or stream.
> + * Every underlying layer in turn can re-define some or all of them to better
> + * fit its needs. For example, card may define number of channels to be
> + * in [1; 8] range, and some particular stream may be limited to [1; 2] only.
> + * The rule is that the underlying layer must be a subset of the upper layer
> + * range.
> + *
> + * channels-min
> + * Values: <uint8_t>
> + *
> + * The minimum amount of channels that is supported, [1; channels-max].
> + * Optional, if not set or omitted a value of 1 is used.
> + *
> + * channels-max
> + * Values: <uint8_t>
> + *
> + * The maximum amount of channels that is supported.
> + * Must be at least <channels-min>.
> + *
> + * sample-rates
> + * Values: <list of uint32_t>
> + *
> + * List of supported sample rates separated by XENSND_LIST_SEPARATOR.
> + * Sample rates are expressed as a list of decimal values w/o any
> + * ordering requirement.
> + *
> + * sample-formats
> + * Values: <list of XENSND_PCM_FORMAT_XXX_STR>
> + *
> + * List of supported sample formats separated by XENSND_LIST_SEPARATOR.
> + * Items must not exceed XENSND_SAMPLE_FORMAT_MAX_LEN length.
> + *
> + * buffer-size
> + * Values: <uint32_t>
> + *
> + * The maximum size in octets of the buffer to allocate per stream.
> + *
> + *----------------------- Virtual sound card settings -------------------------
> + * short-name
> + * Values: <char[32]>
> + *
> + * Short name of the virtual sound card. Optional.
> + *
> + * long-name
> + * Values: <char[80]>
> + *
> + * Long name of the virtual sound card. Optional.
> + *
> + *----------------------------- Device settings -------------------------------
> + * name
> + * Values: <char[80]>
> + *
> + * Name of the sound device within the virtual sound card. Optional.
> + *
> + *----------------------------- Stream settings -------------------------------
> + *
> + * type
> + * Values: "p", "c"
> + *
> + * Stream type: "p" - playback stream, "c" - capture stream
> + *
> + * If both capture and playback are needed then two streams need to be
> + * defined under the same device.
> + *
> + * unique-id
> + * Values: <uint32_t>
> + *
> + * After stream initialization it is assigned a unique ID (within the front
> + * driver), so every stream of the frontend can be identified by the
> + * backend by this ID. This is not equal to stream-idx as the later is
> + * zero based within the device, but this index is contigous within the
> + * driver.
> + *
> + *-------------------- Stream Request Transport Parameters --------------------
> + *
> + * event-channel
> + * Values: <uint32_t>
> + *
> + * The identifier of the Xen event channel used to signal activity
> + * in the ring buffer.
> + *
> + * ring-ref
> + * Values: <uint32_t>
> + *
> + * The Xen grant reference granting permission for the backend to map
> + * a sole page in a single page sized ring buffer.
> + *
> + ******************************************************************************
> + * STATE DIAGRAMS
> + ******************************************************************************
> + *
> + * Tool stack creates front and back state nodes with initial state
> + * XenbusStateInitialising.
> + * Tool stack creates and sets up frontend sound configuration nodes per domain.
> + *
> + * Front Back
> + * ================================= =====================================
> + * XenbusStateInitialising XenbusStateInitialising
> + * o Query backend device identification
> + * data.
> + * o Open and validate backend device.
> + * |
> + * |
> + * V
> + * XenbusStateInitWait
> + *
> + * o Query frontend configuration
> + * o Allocate and initialize
> + * event channels per configured
> + * playback/capture stream.
> + * o Publish transport parameters
> + * that will be in effect during
> + * this connection.
> + * |
> + * |
> + * V
> + * XenbusStateInitialised
> + *
> + * o Query frontend transport parameters.
> + * o Connect to the event channels.
> + * |
> + * |
> + * V
> + * XenbusStateConnected
> + *
> + * o Create and initialize OS
> + * virtual sound device instances
> + * as per configuration.
> + * |
> + * |
> + * V
> + * XenbusStateConnected
> + *
> + * XenbusStateUnknown
> + * XenbusStateClosed
> + * XenbusStateClosing
> + * o Remove virtual sound device
> + * o Remove event channels
> + * |
> + * |
> + * V
> + * XenbusStateClosed
> + *
> + *------------------------------- Recovery flow -------------------------------
> + *
> + * In case of frontend unrecoverable errors backend handles that as
> + * if frontend goes into the XenbusStateClosed state.
> + *
> + * In case of backend unrecoverable errors frontend tries removing
> + * the virtualized device. If this is possible at the moment of error,
> + * then frontend goes into the XenbusStateInitialising state and is ready for
> + * new connection with backend. If the virtualized device is still in use and
> + * cannot be removed, then frontend goes into the XenbusStateReconfiguring state
> + * until either the virtualized device removed or backend initiates a new
> + * connection. On the virtualized device removal frontend goes into the
> + * XenbusStateInitialising state.
> + *
> + * Note on XenbusStateReconfiguring state of the frontend: if backend has
> + * unrecoverable errors then frontend cannot send requests to the backend
> + * and thus cannot provide functionality of the virtualized device anymore.
> + * After backend is back to normal the virtualized device may still hold some
> + * state: configuration in use, allocated buffers, client application state etc.
> + * So, in most cases, this will require frontend to implement complex recovery
> + * reconnect logic. Instead, by going into XenbusStateReconfiguring state,
> + * frontend will make sure no new clients of the virtualized device are
> + * accepted, allow existing client(s) to exit gracefully by signaling error
> + * state etc.
> + * Once all the clients are gone frontend can reinitialize the virtualized
> + * device and get into XenbusStateInitialising state again signaling the
> + * backend that a new connection can be made.
> + *
> + * There are multiple conditions possible under which frontend will go from
> + * XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
> + * specific. For example:
> + * 1. The underlying OS framework may provide callbacks to signal that the last
> + * client of the virtualized device has gone and the device can be removed
> + * 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
> + * to periodically check if this is the right time to re-try removal of
> + * the virtualized device.
> + * 3. By any other means.
> + *
> + ******************************************************************************
> + * PCM FORMATS
> + ******************************************************************************
> + *
> + * XENSND_PCM_FORMAT_<format>[_<endian>]
> + *
> + * format: <S/U/F><bits> or <name>
> + * S - signed, U - unsigned, F - float
> + * bits - 8, 16, 24, 32
> + * name - MU_LAW, GSM, etc.
> + *
> + * endian: <LE/BE>, may be absent
> + * LE - Little endian, BE - Big endian
> + */
> +#define XENSND_PCM_FORMAT_S8 0
> +#define XENSND_PCM_FORMAT_U8 1
> +#define XENSND_PCM_FORMAT_S16_LE 2
> +#define XENSND_PCM_FORMAT_S16_BE 3
> +#define XENSND_PCM_FORMAT_U16_LE 4
> +#define XENSND_PCM_FORMAT_U16_BE 5
> +#define XENSND_PCM_FORMAT_S24_LE 6
> +#define XENSND_PCM_FORMAT_S24_BE 7
> +#define XENSND_PCM_FORMAT_U24_LE 8
> +#define XENSND_PCM_FORMAT_U24_BE 9
> +#define XENSND_PCM_FORMAT_S32_LE 10
> +#define XENSND_PCM_FORMAT_S32_BE 11
> +#define XENSND_PCM_FORMAT_U32_LE 12
> +#define XENSND_PCM_FORMAT_U32_BE 13
> +#define XENSND_PCM_FORMAT_F32_LE 14 /* 4-byte float, IEEE-754 32-bit, */
> +#define XENSND_PCM_FORMAT_F32_BE 15 /* range -1.0 to 1.0 */
> +#define XENSND_PCM_FORMAT_F64_LE 16 /* 8-byte float, IEEE-754 64-bit, */
> +#define XENSND_PCM_FORMAT_F64_BE 17 /* range -1.0 to 1.0 */
> +#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE 18
> +#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE 19
> +#define XENSND_PCM_FORMAT_MU_LAW 20
> +#define XENSND_PCM_FORMAT_A_LAW 21
> +#define XENSND_PCM_FORMAT_IMA_ADPCM 22
> +#define XENSND_PCM_FORMAT_MPEG 23
> +#define XENSND_PCM_FORMAT_GSM 24
> +
> +/*
> + ******************************************************************************
> + * REQUEST CODES
> + ******************************************************************************
> + */
> +#define XENSND_OP_OPEN 0
> +#define XENSND_OP_CLOSE 1
> +#define XENSND_OP_READ 2
> +#define XENSND_OP_WRITE 3
> +#define XENSND_OP_SET_VOLUME 4
> +#define XENSND_OP_GET_VOLUME 5
> +#define XENSND_OP_MUTE 6
> +#define XENSND_OP_UNMUTE 7
> +
> +/*
> + ******************************************************************************
> + * XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
> + ******************************************************************************
> + */
> +#define XENSND_DRIVER_NAME "vsnd"
> +
> +#define XENSND_LIST_SEPARATOR ","
> +/* Field names */
> +#define XENSND_FIELD_BE_VERSIONS "versions"
> +#define XENSND_FIELD_FE_VERSION "version"
> +#define XENSND_FIELD_VCARD_SHORT_NAME "short-name"
> +#define XENSND_FIELD_VCARD_LONG_NAME "long-name"
> +#define XENSND_FIELD_RING_REF "ring-ref"
> +#define XENSND_FIELD_EVT_CHNL "event-channel"
> +#define XENSND_FIELD_DEVICE_NAME "name"
> +#define XENSND_FIELD_TYPE "type"
> +#define XENSND_FIELD_STREAM_UNIQUE_ID "unique-id"
> +#define XENSND_FIELD_CHANNELS_MIN "channels-min"
> +#define XENSND_FIELD_CHANNELS_MAX "channels-max"
> +#define XENSND_FIELD_SAMPLE_RATES "sample-rates"
> +#define XENSND_FIELD_SAMPLE_FORMATS "sample-formats"
> +#define XENSND_FIELD_BUFFER_SIZE "buffer-size"
> +
> +/* Stream type field values. */
> +#define XENSND_STREAM_TYPE_PLAYBACK "p"
> +#define XENSND_STREAM_TYPE_CAPTURE "c"
> +/* Sample rate max string length */
> +#define XENSND_SAMPLE_RATE_MAX_LEN 11
> +/* Sample format field values */
> +#define XENSND_SAMPLE_FORMAT_MAX_LEN 24
> +
> +#define XENSND_PCM_FORMAT_S8_STR "s8"
> +#define XENSND_PCM_FORMAT_U8_STR "u8"
> +#define XENSND_PCM_FORMAT_S16_LE_STR "s16_le"
> +#define XENSND_PCM_FORMAT_S16_BE_STR "s16_be"
> +#define XENSND_PCM_FORMAT_U16_LE_STR "u16_le"
> +#define XENSND_PCM_FORMAT_U16_BE_STR "u16_be"
> +#define XENSND_PCM_FORMAT_S24_LE_STR "s24_le"
> +#define XENSND_PCM_FORMAT_S24_BE_STR "s24_be"
> +#define XENSND_PCM_FORMAT_U24_LE_STR "u24_le"
> +#define XENSND_PCM_FORMAT_U24_BE_STR "u24_be"
> +#define XENSND_PCM_FORMAT_S32_LE_STR "s32_le"
> +#define XENSND_PCM_FORMAT_S32_BE_STR "s32_be"
> +#define XENSND_PCM_FORMAT_U32_LE_STR "u32_le"
> +#define XENSND_PCM_FORMAT_U32_BE_STR "u32_be"
> +#define XENSND_PCM_FORMAT_F32_LE_STR "float_le"
> +#define XENSND_PCM_FORMAT_F32_BE_STR "float_be"
> +#define XENSND_PCM_FORMAT_F64_LE_STR "float64_le"
> +#define XENSND_PCM_FORMAT_F64_BE_STR "float64_be"
> +#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE_STR "iec958_subframe_le"
> +#define XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE_STR "iec958_subframe_be"
> +#define XENSND_PCM_FORMAT_MU_LAW_STR "mu_law"
> +#define XENSND_PCM_FORMAT_A_LAW_STR "a_law"
> +#define XENSND_PCM_FORMAT_IMA_ADPCM_STR "ima_adpcm"
> +#define XENSND_PCM_FORMAT_MPEG_STR "mpeg"
> +#define XENSND_PCM_FORMAT_GSM_STR "gsm"
> +
> +
> +/*
> + ******************************************************************************
> + * STATUS RETURN CODES
> + ******************************************************************************
> + *
> + * Status return code is zero on success and -XEN_EXX on failure.
> + *
> + ******************************************************************************
> + * Assumptions
> + ******************************************************************************
> + * o usage of grant reference 0 as invalid grant reference:
> + * grant reference 0 is valid, but never exposed to a PV driver,
> + * because of the fact it is already in use/reserved by the PV console.
> + * o all references in this document to page sizes must be treated
> + * as pages of size XEN_PAGE_SIZE unless otherwise noted.
> + *
> + ******************************************************************************
> + * Description of the protocol between frontend and backend driver
> + ******************************************************************************
> + *
> + * The two halves of a Para-virtual sound driver communicate with
> + * each other using shared pages and event channels.
> + * Shared page contains a ring with request/response packets.
> + *
> + * Packets, used for input/output operations, e.g. read/write, set/get volume,
> + * etc., provide offset/length fields in order to allow asynchronous protocol
> + * operation with buffer space sharing: part of the buffer allocated at
> + * XENSND_OP_OPEN can be used for audio samples and part, for example,
> + * for volume control.
> + *
> + * All reserved fields in the structures below must be 0.
> + *
> + *---------------------------------- Requests ---------------------------------
> + *
> + * All request packets have the same length (32 octets)
> + * All request packets have common header:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | operation | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * id - uint16_t, private guest value, echoed in response
> + * operation - uint8_t, operation code, XENSND_OP_???
> + *
> + * For all packets which use offset and length:
> + * offset - uint32_t, read or write data offset within the shared buffer,
> + * passed with XENSND_OP_OPEN request, octets,
> + * [0; XENSND_OP_OPEN.buffer_sz - 1].
> + * length - uint32_t, read or write data length, octets
> + *
> + * Request open - open a PCM stream for playback or capture:
> + *
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | XENSND_OP_OPEN | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * | pcm_rate | 12
> + * +----------------+----------------+----------------+----------------+
> + * | pcm_format | pcm_channels | reserved | 16
> + * +----------------+----------------+----------------+----------------+
> + * | buffer_sz | 20
> + * +----------------+----------------+----------------+----------------+
> + * | gref_directory | 24
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 28
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * pcm_rate - uint32_t, stream data rate, Hz
> + * pcm_format - uint8_t, XENSND_PCM_FORMAT_XXX value
> + * pcm_channels - uint8_t, number of channels of this stream,
> + * [channels-min; channels-max]
> + * buffer_sz - uint32_t, buffer size to be allocated, octets
> + * gref_directory - grant_ref_t, a reference to the first shared page
> + * describing shared buffer references. At least one page exists. If shared
> + * buffer size (buffer_sz) exceeds what can be addressed by this single page,
> + * then reference to the next page must be supplied (see gref_dir_next_page
> + * below)
> + */
> +
> +struct xensnd_open_req {
> + uint32_t pcm_rate;
> + uint8_t pcm_format;
> + uint8_t pcm_channels;
> + uint16_t reserved;
> + uint32_t buffer_sz;
> + grant_ref_t gref_directory;
> +};
> +
> +/*
> + * Shared page for XENSND_OP_OPEN buffer descriptor (gref_directory in the
> + * request) employs a list of pages, describing all pages of the shared data
> + * buffer:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | gref_dir_next_page | 4
> + * +----------------+----------------+----------------+----------------+
> + * | gref[0] | 8
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | gref[i] | i*4+8
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | gref[N - 1] | N*4+8
> + * +----------------+----------------+----------------+----------------+
> + *
> + * gref_dir_next_page - grant_ref_t, reference to the next page describing
> + * page directory. Must be 0 if there are no more pages in the list.
> + * gref[i] - grant_ref_t, reference to a shared page of the buffer
> + * allocated at XENSND_OP_OPEN
> + *
> + * Number of grant_ref_t entries in the whole page directory is not
> + * passed, but instead can be calculated as:
> + * num_grefs_total = (XENSND_OP_OPEN.buffer_sz + XEN_PAGE_SIZE - 1) /
> + * XEN_PAGE_SIZE
> + */
> +
> +struct xensnd_page_directory {
> + grant_ref_t gref_dir_next_page;
> + grant_ref_t gref[1]; /* Variable length */
> +};
> +
> +/*
> + * Request close - close an opened pcm stream:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | XENSND_OP_CLOSE| reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * Request read/write - used for read (for capture) or write (for playback):
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | operation | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * | offset | 12
> + * +----------------+----------------+----------------+----------------+
> + * | length | 16
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 20
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * operation - XENSND_OP_READ for read or XENSND_OP_WRITE for write
> + */
> +
> +struct xensnd_rw_req {
> + uint32_t offset;
> + uint32_t length;
> +};
> +
> +/*
> + * Request set/get volume - set/get channels' volume of the stream given:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | operation | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * | offset | 12
> + * +----------------+----------------+----------------+----------------+
> + * | length | 16
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * operation - XENSND_OP_SET_VOLUME for volume set
> + * or XENSND_OP_GET_VOLUME for volume get
> + * Buffer passed with XENSND_OP_OPEN is used to exchange volume
> + * values:
> + *
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | channel[0] | 4
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | channel[i] | i*4
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | channel[N - 1] | (N-1)*4
> + * +----------------+----------------+----------------+----------------+
> + *
> + * N = XENSND_OP_OPEN.pcm_channels
> + * i - uint8_t, index of a channel
> + * channel[i] - sint32_t, volume of i-th channel
> + * Volume is expressed as a signed value in steps of 0.001 dB,
> + * while 0 being 0 dB.
> + *
> + * Request mute/unmute - mute/unmute stream:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | operation | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 8
> + * +----------------+----------------+----------------+----------------+
> + * | offset | 12
> + * +----------------+----------------+----------------+----------------+
> + * | length | 16
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * operation - XENSND_OP_MUTE for mute or XENSND_OP_UNMUTE for unmute
> + * Buffer passed with XENSND_OP_OPEN is used to exchange mute/unmute
> + * values:
> + *
> + * 0 octet
> + * +----------------+----------------+----------------+----------------+
> + * | channel[0] | 4
> + * +----------------+----------------+----------------+----------------+
> + * +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | channel[i] | i*4
> + * +----------------+----------------+----------------+----------------+
> + * +/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | channel[N - 1] | (N-1)*4
> + * +----------------+----------------+----------------+----------------+
> + *
> + * N = XENSND_OP_OPEN.pcm_channels
> + * i - uint8_t, index of a channel
> + * channel[i] - uint8_t, non-zero if i-th channel needs to be muted/unmuted
> + *
> + *------------------------------------ N.B. -----------------------------------
> + *
> + * The 'struct xensnd_rw_req' is also used for XENSND_OP_SET_VOLUME,
> + * XENSND_OP_GET_VOLUME, XENSND_OP_MUTE, XENSND_OP_UNMUTE.
> + */
> +
> +/*
> + *---------------------------------- Responses --------------------------------
> + *
> + * All response packets have the same length (32 octets)
> + *
> + * Response for all requests:
> + * 0 1 2 3 octet
> + * +----------------+----------------+----------------+----------------+
> + * | id | operation | reserved | 4
> + * +----------------+----------------+----------------+----------------+
> + * | status | 8
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 12
> + * +----------------+----------------+----------------+----------------+
> + * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
> + * +----------------+----------------+----------------+----------------+
> + * | reserved | 32
> + * +----------------+----------------+----------------+----------------+
> + *
> + * id - uint16_t, copied from the request
> + * operation - uint8_t, XENSND_OP_* - copied from request
> + * status - int32_t, response status, zero on success and -XEN_EXX on failure
> + */
> +
> +struct xensnd_req {
> + uint16_t id;
> + uint8_t operation;
> + uint8_t reserved[5];
> + union {
> + struct xensnd_open_req open;
> + struct xensnd_rw_req rw;
> + uint8_t reserved[24];
> + } op;
> +};
> +
> +struct xensnd_resp {
> + uint16_t id;
> + uint8_t operation;
> + uint8_t reserved;
> + int32_t status;
> + uint8_t reserved1[24];
> +};
> +
> +DEFINE_RING_TYPES(xen_sndif, struct xensnd_req, struct xensnd_resp);
> +
> +#endif /* __XEN_PUBLIC_IO_SNDIF_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
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2017-03-20 7:03 [PATCH v18] xen/sndif: Add sound-device ABI Oleksandr Andrushchenko
2017-03-20 7:03 ` Oleksandr Andrushchenko
2017-03-28 7:57 ` Oleksandr Andrushchenko
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