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bh=GZjFS/hdvT8y2d1p3xi33JUio+UqLSU4JtKs354VCAg=; b=Gbhyi1mTUveGsDTpqBaVRUMkZrsLF9ilb83dF2rb84p6BOM6fTa4j69TNzr9QZsdcLqd77vuN6RXiKJ+Gkysi1ro15NJchWOzHhJYf478LaOFfdHVFTdy98M6ofQGhQ10CfqRXxOhrbH6+ZH152wWDAvdW/zmQP3yrojcWcEl6sSbatMGFuwi6wQOBTz84JXTM60bSJaoeDLViyxMKoK1lecR5P6v5i+Z6RZSHw0uxJ4dWfOIbRtZLIHypqBEh/UmjIVxrUZcQv6MjobMzfZ5D5Y9KptwKQwij5tiDwJYnBKtn6YiJx+ToQ5cZ3q4XVnAHKF1DW8kWrtLbwjU3A6aA== From: Jamin Lin To: Paolo Bonzini , Peter Maydell , =?iso-8859-1?Q?C=E9dric_Le_Goater?= , Steven Lee , Troy Lee , Andrew Jeffery , Joel Stanley , =?iso-8859-1?Q?Marc-Andr=E9_Lureau?= , =?iso-8859-1?Q?Daniel_P=2E_Berrang=E9?= , =?iso-8859-1?Q?Philippe_Mathieu-Daud=E9?= , "open list:All patches CC here" , "open list:ARM TCG CPUs" CC: Jamin Lin , Troy Lee , Kane Chen , "nabihestefan@google.com" , "komlodi@google.com" , Titus Rwantare , Patrick Venture Subject: [PATCH v7 18/22] hw/i3c: Add Mock target Thread-Topic: [PATCH v7 18/22] hw/i3c: Add Mock target Thread-Index: AQHcpfwz6dtr4P+XREmLu/9O1ZNFdA== Date: Wed, 25 Feb 2026 02:12:33 +0000 Message-ID: <20260225021158.1586584-19-jamin_lin@aspeedtech.com> References: <20260225021158.1586584-1-jamin_lin@aspeedtech.com> In-Reply-To: <20260225021158.1586584-1-jamin_lin@aspeedtech.com> Accept-Language: zh-TW, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=aspeedtech.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c406::3; envelope-from=jamin_lin@aspeedtech.com; helo=OS8PR02CU002.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @aspeedtech.com) X-ZM-MESSAGEID: 1771985734978158500 Content-Type: text/plain; charset="utf-8" Adds a simple i3c device to be used for testing in lieu of a real device. The mock target supports the following features: - A buffer that users can read and write to. - CCC support for commonly used CCCs when probing devices on an I3C bus. - IBI sending upon receiving a user-defined byte. Signed-off-by: Joe Komlodi Reviewed-by: Titus Rwantare Reviewed-by: Patrick Venture Reviewed-by: Jamin Lin Signed-off-by: Jamin Lin Reviewed-by: Jithu Joseph --- include/hw/i3c/mock-i3c-target.h | 52 ++++++ hw/i3c/mock-i3c-target.c | 298 +++++++++++++++++++++++++++++++ hw/i3c/Kconfig | 10 ++ hw/i3c/meson.build | 1 + hw/i3c/trace-events | 10 ++ 5 files changed, 371 insertions(+) create mode 100644 include/hw/i3c/mock-i3c-target.h create mode 100644 hw/i3c/mock-i3c-target.c diff --git a/include/hw/i3c/mock-i3c-target.h b/include/hw/i3c/mock-i3c-tar= get.h new file mode 100644 index 0000000000..8c6003ae8b --- /dev/null +++ b/include/hw/i3c/mock-i3c-target.h @@ -0,0 +1,52 @@ +#ifndef MOCK_I3C_TARGET_H_ +#define MOCK_I3C_TARGET_H_ + +/* + * Mock I3C Device + * + * Copyright (c) 2025 Google LLC + * + * The mock I3C device can be thought of as a simple EEPROM. It has a buff= er, + * and the pointer in the buffer is reset to 0 on an I3C STOP. + * To write to the buffer, issue a private write and send data. + * To read from the buffer, issue a private read. + * + * The mock target also supports sending target interrupt IBIs. + * To issue an IBI, set the 'ibi-magic-num' property to a non-zero number,= and + * send that number in a private transaction. The mock target will issue a= n IBI + * after 1 second. + * + * It also supports a handful of CCCs that are typically used when probing= I3C + * devices. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/timer.h" +#include "hw/i3c/i3c.h" + +#define TYPE_MOCK_I3C_TARGET "mock-i3c-target" +OBJECT_DECLARE_SIMPLE_TYPE(MockI3cTargetState, MOCK_I3C_TARGET) + +struct MockI3cTargetState { + I3CTarget parent_obj; + + /* General device state */ + bool can_ibi; + QEMUTimer qtimer; + size_t p_buf; + uint8_t *buf; + + /* For Handing CCCs. */ + bool in_ccc; + I3CCCC curr_ccc; + uint8_t ccc_byte_offset; + + struct { + uint32_t buf_size; + uint8_t ibi_magic; + } cfg; +}; + +#endif diff --git a/hw/i3c/mock-i3c-target.c b/hw/i3c/mock-i3c-target.c new file mode 100644 index 0000000000..875cd7c7d0 --- /dev/null +++ b/hw/i3c/mock-i3c-target.c @@ -0,0 +1,298 @@ +/* + * Mock I3C Device + * + * Copyright (c) 2025 Google LLC + * + * The mock I3C device can be thought of as a simple EEPROM. It has a buff= er, + * and the pointer in the buffer is reset to 0 on an I3C STOP. + * To write to the buffer, issue a private write and send data. + * To read from the buffer, issue a private read. + * + * The mock target also supports sending target interrupt IBIs. + * To issue an IBI, set the 'ibi-magic-num' property to a non-zero number,= and + * send that number in a private transaction. The mock target will issue a= n IBI + * after 1 second. + * + * It also supports a handful of CCCs that are typically used when probing= I3C + * devices. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "trace.h" +#include "hw/i3c/i3c.h" +#include "hw/i3c/mock-i3c-target.h" +#include "hw/core/irq.h" +#include "hw/core/qdev-properties.h" +#include "qapi/error.h" +#include "qemu/module.h" + +#define IBI_DELAY_NS (1 * 1000 * 1000) + +static uint32_t mock_i3c_target_rx(I3CTarget *i3c, uint8_t *data, + uint32_t num_to_read) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + uint32_t i; + + /* Bounds check. */ + if (s->p_buf =3D=3D s->cfg.buf_size) { + return 0; + } + + for (i =3D 0; i < num_to_read; i++) { + data[i] =3D s->buf[s->p_buf]; + trace_mock_i3c_target_rx(data[i]); + s->p_buf++; + if (s->p_buf =3D=3D s->cfg.buf_size) { + break; + } + } + + /* Return the number of bytes we're sending to the controller. */ + return i; +} + +static void mock_i3c_target_ibi_timer_start(MockI3cTargetState *s) +{ + int64_t now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + timer_mod(&s->qtimer, now + IBI_DELAY_NS); +} + +static int mock_i3c_target_tx(I3CTarget *i3c, const uint8_t *data, + uint32_t num_to_send, uint32_t *num_sent) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + int ret; + uint32_t to_write; + + if (s->cfg.ibi_magic && num_to_send =3D=3D 1 && s->cfg.ibi_magic =3D= =3D *data) { + mock_i3c_target_ibi_timer_start(s); + return 0; + } + + /* Bounds check. */ + if (num_to_send + s->p_buf > s->cfg.buf_size) { + to_write =3D s->cfg.buf_size - s->p_buf; + ret =3D -1; + } else { + to_write =3D num_to_send; + ret =3D 0; + } + for (uint32_t i =3D 0; i < to_write; i++) { + trace_mock_i3c_target_tx(data[i]); + s->buf[s->p_buf] =3D data[i]; + s->p_buf++; + } + return ret; +} + +static int mock_i3c_target_event(I3CTarget *i3c, enum I3CEvent event) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + + trace_mock_i3c_target_event(event); + if (event =3D=3D I3C_STOP) { + s->in_ccc =3D false; + s->curr_ccc =3D 0; + s->ccc_byte_offset =3D 0; + s->p_buf =3D 0; + } + + return 0; +} + +static int mock_i3c_target_handle_ccc_read(I3CTarget *i3c, uint8_t *data, + uint32_t num_to_read, + uint32_t *num_read) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + + switch (s->curr_ccc) { + case I3C_CCCD_GETMXDS: + /* Default data rate for I3C. */ + while (s->ccc_byte_offset < num_to_read) { + if (s->ccc_byte_offset >=3D 2) { + break; + } + data[s->ccc_byte_offset] =3D 0; + *num_read =3D s->ccc_byte_offset; + s->ccc_byte_offset++; + } + break; + case I3C_CCCD_GETCAPS: + /* Support I3C version 1.1.x, no other features. */ + while (s->ccc_byte_offset < num_to_read) { + if (s->ccc_byte_offset >=3D 2) { + break; + } + if (s->ccc_byte_offset =3D=3D 0) { + data[s->ccc_byte_offset] =3D 0; + } else { + data[s->ccc_byte_offset] =3D 0x01; + } + *num_read =3D s->ccc_byte_offset; + s->ccc_byte_offset++; + } + break; + case I3C_CCCD_GETMWL: + case I3C_CCCD_GETMRL: + /* MWL/MRL is MSB first. */ + while (s->ccc_byte_offset < num_to_read) { + if (s->ccc_byte_offset >=3D 2) { + break; + } + data[s->ccc_byte_offset] =3D (s->cfg.buf_size & + (0xff00 >> (s->ccc_byte_offset * 8= ))) >> + (8 - (s->ccc_byte_offset * 8)); + s->ccc_byte_offset++; + *num_read =3D num_to_read; + } + break; + case I3C_CCC_ENTDAA: + case I3C_CCCD_GETPID: + case I3C_CCCD_GETBCR: + case I3C_CCCD_GETDCR: + /* Nothing to do. */ + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, "Unhandled CCC 0x%.2x\n", s->curr_c= cc); + return -1; + } + + trace_mock_i3c_target_handle_ccc_read(*num_read, num_to_read); + return 0; +} + +static int mock_i3c_target_handle_ccc_write(I3CTarget *i3c, const uint8_t = *data, + uint32_t num_to_send, + uint32_t *num_sent) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + + if (!s->curr_ccc) { + s->in_ccc =3D true; + s->curr_ccc =3D *data; + trace_mock_i3c_target_new_ccc(s->curr_ccc); + } + + *num_sent =3D 1; + switch (s->curr_ccc) { + case I3C_CCC_ENEC: + case I3C_CCCD_ENEC: + s->can_ibi =3D true; + break; + case I3C_CCC_DISEC: + case I3C_CCCD_DISEC: + s->can_ibi =3D false; + break; + case I3C_CCC_ENTDAA: + case I3C_CCC_SETAASA: + case I3C_CCC_RSTDAA: + case I3C_CCCD_SETDASA: + case I3C_CCCD_GETPID: + case I3C_CCCD_GETBCR: + case I3C_CCCD_GETDCR: + case I3C_CCCD_GETMWL: + case I3C_CCCD_GETMRL: + case I3C_CCCD_GETMXDS: + case I3C_CCCD_GETCAPS: + /* Nothing to do. */ + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, "Unhandled CCC 0x%.2x\n", s->curr_c= cc); + return -1; + } + + trace_mock_i3c_target_handle_ccc_write(*num_sent, num_to_send); + return 0; +} + +static void mock_i3c_target_do_ibi(MockI3cTargetState *s) +{ + if (!s->can_ibi) { + return; + } + + trace_mock_i3c_target_do_ibi(s->parent_obj.address, true); + int nack =3D i3c_target_send_ibi(&s->parent_obj, s->parent_obj.address, + /*is_recv=3D*/true); + /* Getting NACKed isn't necessarily an error, just print it out. */ + if (nack) { + trace_mock_i3c_target_do_ibi_nack("sending"); + } + nack =3D i3c_target_ibi_finish(&s->parent_obj, 0x00); + if (nack) { + trace_mock_i3c_target_do_ibi_nack("finishing"); + } +} + +static void mock_i3c_target_timer_elapsed(void *opaque) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(opaque); + timer_del(&s->qtimer); + mock_i3c_target_do_ibi(s); +} + +static void mock_i3c_target_reset(I3CTarget *i3c) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(i3c); + s->can_ibi =3D false; +} + +static void mock_i3c_target_realize(DeviceState *dev, Error **errp) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(dev); + s->buf =3D g_new0(uint8_t, s->cfg.buf_size); + mock_i3c_target_reset(&s->parent_obj); +} + +static void mock_i3c_target_init(Object *obj) +{ + MockI3cTargetState *s =3D MOCK_I3C_TARGET(obj); + s->can_ibi =3D false; + + /* For IBIs. */ + timer_init_ns(&s->qtimer, QEMU_CLOCK_VIRTUAL, mock_i3c_target_timer_el= apsed, + s); +} + +static const Property remote_i3c_props[] =3D { + /* The size of the internal buffer. */ + DEFINE_PROP_UINT32("buf-size", MockI3cTargetState, cfg.buf_size, 0x100= ), + /* + * If the mock target receives this number, it will issue an IBI after + * 1 second. Disabled if the IBI magic number is 0. + */ + DEFINE_PROP_UINT8("ibi-magic-num", MockI3cTargetState, cfg.ibi_magic, = 0x00), +}; + +static void mock_i3c_target_class_init(ObjectClass *klass, const void *dat= a) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + I3CTargetClass *k =3D I3C_TARGET_CLASS(klass); + + dc->realize =3D mock_i3c_target_realize; + k->event =3D mock_i3c_target_event; + k->recv =3D mock_i3c_target_rx; + k->send =3D mock_i3c_target_tx; + k->handle_ccc_read =3D mock_i3c_target_handle_ccc_read; + k->handle_ccc_write =3D mock_i3c_target_handle_ccc_write; + + device_class_set_props(dc, remote_i3c_props); +} + +static const TypeInfo mock_i3c_target_types[] =3D { + { + .name =3D TYPE_MOCK_I3C_TARGET, + .parent =3D TYPE_I3C_TARGET, + .instance_size =3D sizeof(MockI3cTargetState), + .instance_init =3D mock_i3c_target_init, + .class_init =3D mock_i3c_target_class_init, + }, +}; + +DEFINE_TYPES(mock_i3c_target_types) + diff --git a/hw/i3c/Kconfig b/hw/i3c/Kconfig index ecec77d6fc..d5c6d4049b 100644 --- a/hw/i3c/Kconfig +++ b/hw/i3c/Kconfig @@ -3,3 +3,13 @@ config I3C =20 config DW_I3C bool + +config I3C_DEVICES + # Device group for i3c devices which can reasonably be user-plugged to= any + # board's i3c bus. + bool + +config MOCK_I3C_TARGET + bool + select I3C + default y if I3C_DEVICES diff --git a/hw/i3c/meson.build b/hw/i3c/meson.build index 83d75e7d5c..e614b18712 100644 --- a/hw/i3c/meson.build +++ b/hw/i3c/meson.build @@ -2,4 +2,5 @@ i3c_ss =3D ss.source_set() i3c_ss.add(when: 'CONFIG_I3C', if_true: files('core.c')) i3c_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('aspeed_i3c.c')) i3c_ss.add(when: 'CONFIG_DW_I3C', if_true: files('dw-i3c.c')) +i3c_ss.add(when: 'CONFIG_MOCK_I3C_TARGET', if_true: files('mock-i3c-target= .c')) system_ss.add_all(when: 'CONFIG_I3C', if_true: i3c_ss) diff --git a/hw/i3c/trace-events b/hw/i3c/trace-events index 39f33d9a50..9e58edec99 100644 --- a/hw/i3c/trace-events +++ b/hw/i3c/trace-events @@ -36,3 +36,13 @@ legacy_i2c_recv(uint8_t byte) "Legacy I2C recv 0x%" PRIx8 legacy_i2c_send(uint8_t byte) "Legacy I2C send 0x%" PRIx8 legacy_i2c_start_transfer(uint8_t address, bool is_recv) "Legacy I2C START= with address 0x%" PRIx8 " is_recv=3D%d" legacy_i2c_end_transfer(void) "Legacy I2C STOP" + +# mock-target.c +mock_i3c_target_rx(uint8_t byte) "I3C mock target read 0x%" PRIx8 +mock_i3c_target_tx(uint8_t byte) "I3C mock target write 0x%" PRIx8 +mock_i3c_target_event(uint8_t event) "I3C mock target event 0x%" PRIx8 +mock_i3c_target_handle_ccc_read(uint32_t num_read, uint32_t num_to_read) "= I3C mock target read %" PRId32 "/%" PRId32 " bytes" +mock_i3c_target_new_ccc(uint8_t ccc) "I3C mock target handle CCC 0x%" PRIx8 +mock_i3c_target_handle_ccc_write(uint32_t num_sent, uint32_t num_to_send) = "I3C mock target send %" PRId32 "/%" PRId32 " bytes" +mock_i3c_target_do_ibi(uint8_t address, bool is_recv) "I3C mock target IBI= with address 0x%" PRIx8 " RnW=3D%d" +mock_i3c_target_do_ibi_nack(const char *reason) "NACKed from controller wh= en %s target interrupt" --=20 2.43.0