| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20230313132636.31850-5-nipun.gupta@amd.com>
Date: Mon, 13 Mar 2023 18:56:33 +0530
From: Nipun Gupta <nipun.gupta@....com>
To: <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
<gregkh@...uxfoundation.org>, <rafael@...nel.org>,
<eric.auger@...hat.com>, <alex.williamson@...hat.com>,
<cohuck@...hat.com>, <song.bao.hua@...ilicon.com>,
<mchehab+huawei@...nel.org>, <maz@...nel.org>,
<f.fainelli@...il.com>, <jeffrey.l.hugo@...il.com>,
<saravanak@...gle.com>, <Michael.Srba@...nam.cz>,
<mani@...nel.org>, <yishaih@...dia.com>, <jgg@...pe.ca>,
<jgg@...dia.com>, <robin.murphy@....com>, <will@...nel.org>,
<joro@...tes.org>, <masahiroy@...nel.org>,
<ndesaulniers@...gle.com>, <rdunlap@...radead.org>,
<baolu.lu@...ux.intel.com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kbuild@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
CC: <okaya@...nel.org>, <harpreet.anand@....com>,
<nikhil.agarwal@....com>, <michal.simek@....com>,
<pieter.jansen-van-vuuren@....com>, <pablo.cascon@....com>,
<git@....com>, Nipun Gupta <nipun.gupta@....com>
Subject: [PATCH v10 4/7] cdx: add MCDI protocol interface for firmware interaction
The MCDI (Management CPU Driver Interface) is used as a
protocol to communicate with the RPU firmware. It has
pre-defined set of messages for different message exchanges
between APU and RPU.
Signed-off-by: Puneet Gupta <puneet.gupta@....com>
Signed-off-by: Nipun Gupta <nipun.gupta@....com>
Signed-off-by: Tarak Reddy <tarak.reddy@....com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@....com>
---
drivers/cdx/Kconfig | 2 +
drivers/cdx/Makefile | 2 +-
drivers/cdx/controller/Kconfig | 20 +
drivers/cdx/controller/Makefile | 9 +
drivers/cdx/controller/bitfield.h | 90 +++
drivers/cdx/controller/mc_cdx_pcol.h | 590 +++++++++++++++++
drivers/cdx/controller/mcdi.c | 903 +++++++++++++++++++++++++++
drivers/cdx/controller/mcdi.h | 238 +++++++
8 files changed, 1853 insertions(+), 1 deletion(-)
create mode 100644 drivers/cdx/controller/Kconfig
create mode 100644 drivers/cdx/controller/Makefile
create mode 100644 drivers/cdx/controller/bitfield.h
create mode 100644 drivers/cdx/controller/mc_cdx_pcol.h
create mode 100644 drivers/cdx/controller/mcdi.c
create mode 100644 drivers/cdx/controller/mcdi.h
diff --git a/drivers/cdx/Kconfig b/drivers/cdx/Kconfig
index 1aaee0ec5bd9..a08958485e31 100644
--- a/drivers/cdx/Kconfig
+++ b/drivers/cdx/Kconfig
@@ -15,3 +15,5 @@ config CDX_BUS
of CDX devices. CDX devices are memory mapped on system bus
for embedded CPUs. CDX bus uses CDX controller and firmware
to scan these CDX devices.
+
+source "drivers/cdx/controller/Kconfig"
diff --git a/drivers/cdx/Makefile b/drivers/cdx/Makefile
index c5feb11fc718..0324e4914f6e 100644
--- a/drivers/cdx/Makefile
+++ b/drivers/cdx/Makefile
@@ -5,4 +5,4 @@
# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
#
-obj-$(CONFIG_CDX_BUS) += cdx.o
+obj-$(CONFIG_CDX_BUS) += cdx.o controller/
diff --git a/drivers/cdx/controller/Kconfig b/drivers/cdx/controller/Kconfig
new file mode 100644
index 000000000000..785c71063b2a
--- /dev/null
+++ b/drivers/cdx/controller/Kconfig
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# CDX controller configuration
+#
+# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+#
+
+if CDX_BUS
+
+config MCDI_LOGGING
+ bool "MCDI Logging for the CDX controller"
+ depends on CDX_CONTROLLER
+ help
+ Enable MCDI Logging for
+ the CDX Controller for debug
+ purpose.
+
+ If unsure, say N.
+
+endif
diff --git a/drivers/cdx/controller/Makefile b/drivers/cdx/controller/Makefile
new file mode 100644
index 000000000000..0ce200678eda
--- /dev/null
+++ b/drivers/cdx/controller/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for CDX controller drivers
+#
+# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+#
+
+obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o
+cdx-controller-objs := mcdi.o
diff --git a/drivers/cdx/controller/bitfield.h b/drivers/cdx/controller/bitfield.h
new file mode 100644
index 000000000000..567f8ec47582
--- /dev/null
+++ b/drivers/cdx/controller/bitfield.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright 2005-2006 Fen Systems Ltd.
+ * Copyright 2006-2013 Solarflare Communications Inc.
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef CDX_BITFIELD_H
+#define CDX_BITFIELD_H
+
+#include <linux/bitfield.h>
+
+/* Lowest bit numbers and widths */
+#define CDX_DWORD_LBN 0
+#define CDX_DWORD_WIDTH 32
+
+/* Specified attribute (e.g. LBN) of the specified field */
+#define CDX_VAL(field, attribute) field ## _ ## attribute
+/* Low bit number of the specified field */
+#define CDX_LOW_BIT(field) CDX_VAL(field, LBN)
+/* Bit width of the specified field */
+#define CDX_WIDTH(field) CDX_VAL(field, WIDTH)
+/* High bit number of the specified field */
+#define CDX_HIGH_BIT(field) (CDX_LOW_BIT(field) + CDX_WIDTH(field) - 1)
+
+/* A doubleword (i.e. 4 byte) datatype - little-endian in HW */
+struct cdx_dword {
+ __le32 cdx_u32;
+};
+
+/* Value expanders for printk */
+#define CDX_DWORD_VAL(dword) \
+ ((unsigned int)le32_to_cpu((dword).cdx_u32))
+
+/*
+ * Extract bit field portion [low,high) from the 32-bit little-endian
+ * element which contains bits [min,max)
+ */
+#define CDX_DWORD_FIELD(dword, field) \
+ (FIELD_GET(GENMASK(CDX_HIGH_BIT(field), CDX_LOW_BIT(field)), \
+ le32_to_cpu((dword).cdx_u32)))
+
+/*
+ * Creates the portion of the named bit field that lies within the
+ * range [min,max).
+ */
+#define CDX_INSERT_FIELD(field, value) \
+ (FIELD_PREP(GENMASK(CDX_HIGH_BIT(field), \
+ CDX_LOW_BIT(field)), value))
+
+/*
+ * Creates the portion of the named bit fields that lie within the
+ * range [min,max).
+ */
+#define CDX_INSERT_FIELDS(field1, value1, \
+ field2, value2, \
+ field3, value3, \
+ field4, value4, \
+ field5, value5, \
+ field6, value6, \
+ field7, value7) \
+ (CDX_INSERT_FIELD(field1, (value1)) | \
+ CDX_INSERT_FIELD(field2, (value2)) | \
+ CDX_INSERT_FIELD(field3, (value3)) | \
+ CDX_INSERT_FIELD(field4, (value4)) | \
+ CDX_INSERT_FIELD(field5, (value5)) | \
+ CDX_INSERT_FIELD(field6, (value6)) | \
+ CDX_INSERT_FIELD(field7, (value7)))
+
+#define CDX_POPULATE_DWORD(dword, ...) \
+ (dword).cdx_u32 = cpu_to_le32(CDX_INSERT_FIELDS(__VA_ARGS__))
+
+/* Populate a dword field with various numbers of arguments */
+#define CDX_POPULATE_DWORD_7 CDX_POPULATE_DWORD
+#define CDX_POPULATE_DWORD_6(dword, ...) \
+ CDX_POPULATE_DWORD_7(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_POPULATE_DWORD_5(dword, ...) \
+ CDX_POPULATE_DWORD_6(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_POPULATE_DWORD_4(dword, ...) \
+ CDX_POPULATE_DWORD_5(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_POPULATE_DWORD_3(dword, ...) \
+ CDX_POPULATE_DWORD_4(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_POPULATE_DWORD_2(dword, ...) \
+ CDX_POPULATE_DWORD_3(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_POPULATE_DWORD_1(dword, ...) \
+ CDX_POPULATE_DWORD_2(dword, CDX_DWORD, 0, __VA_ARGS__)
+#define CDX_SET_DWORD(dword) \
+ CDX_POPULATE_DWORD_1(dword, CDX_DWORD, 0xffffffff)
+
+#endif /* CDX_BITFIELD_H */
diff --git a/drivers/cdx/controller/mc_cdx_pcol.h b/drivers/cdx/controller/mc_cdx_pcol.h
new file mode 100644
index 000000000000..4ccb7b52951b
--- /dev/null
+++ b/drivers/cdx/controller/mc_cdx_pcol.h
@@ -0,0 +1,590 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Driver for AMD network controllers and boards
+ *
+ * Copyright (C) 2021, Xilinx, Inc.
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef MC_CDX_PCOL_H
+#define MC_CDX_PCOL_H
+
+/* The current version of the MCDI protocol. */
+#define MCDI_PCOL_VERSION 2
+
+/*
+ * Each MCDI request starts with an MCDI_HEADER, which is a 32bit
+ * structure, filled in by the client.
+ *
+ * 0 7 8 16 20 22 23 24 31
+ * | CODE | R | LEN | SEQ | Rsvd | E | R | XFLAGS |
+ * | | |
+ * | | \--- Response
+ * | \------- Error
+ * \------------------------------ Resync (always set)
+ *
+ * The client writes its request into MC shared memory, and rings the
+ * doorbell. Each request is completed either by the MC writing
+ * back into shared memory, or by writing out an event.
+ *
+ * All MCDI commands support completion by shared memory response. Each
+ * request may also contain additional data (accounted for by HEADER.LEN),
+ * and some responses may also contain additional data (again, accounted
+ * for by HEADER.LEN).
+ *
+ * Some MCDI commands support completion by event, in which any associated
+ * response data is included in the event.
+ *
+ * The protocol requires one response to be delivered for every request; a
+ * request should not be sent unless the response for the previous request
+ * has been received (either by polling shared memory, or by receiving
+ * an event).
+ */
+
+/** Request/Response structure */
+#define MCDI_HEADER_OFST 0
+#define MCDI_HEADER_CODE_LBN 0
+#define MCDI_HEADER_CODE_WIDTH 7
+#define MCDI_HEADER_RESYNC_LBN 7
+#define MCDI_HEADER_RESYNC_WIDTH 1
+#define MCDI_HEADER_DATALEN_LBN 8
+#define MCDI_HEADER_DATALEN_WIDTH 8
+#define MCDI_HEADER_SEQ_LBN 16
+#define MCDI_HEADER_SEQ_WIDTH 4
+#define MCDI_HEADER_RSVD_LBN 20
+#define MCDI_HEADER_RSVD_WIDTH 1
+#define MCDI_HEADER_NOT_EPOCH_LBN 21
+#define MCDI_HEADER_NOT_EPOCH_WIDTH 1
+#define MCDI_HEADER_ERROR_LBN 22
+#define MCDI_HEADER_ERROR_WIDTH 1
+#define MCDI_HEADER_RESPONSE_LBN 23
+#define MCDI_HEADER_RESPONSE_WIDTH 1
+#define MCDI_HEADER_XFLAGS_LBN 24
+#define MCDI_HEADER_XFLAGS_WIDTH 8
+/* Request response using event */
+#define MCDI_HEADER_XFLAGS_EVREQ 0x01
+/* Request (and signal) early doorbell return */
+#define MCDI_HEADER_XFLAGS_DBRET 0x02
+
+/* Maximum number of payload bytes */
+#define MCDI_CTL_SDU_LEN_MAX_V2 0x400
+
+#define MCDI_CTL_SDU_LEN_MAX MCDI_CTL_SDU_LEN_MAX_V2
+
+/*
+ * The MC can generate events for two reasons:
+ * - To advance a shared memory request if XFLAGS_EVREQ was set
+ * - As a notification (link state, i2c event), controlled
+ * via MC_CMD_LOG_CTRL
+ *
+ * Both events share a common structure:
+ *
+ * 0 32 33 36 44 52 60
+ * | Data | Cont | Level | Src | Code | Rsvd |
+ * |
+ * \ There is another event pending in this notification
+ *
+ * If Code==CMDDONE, then the fields are further interpreted as:
+ *
+ * - LEVEL==INFO Command succeeded
+ * - LEVEL==ERR Command failed
+ *
+ * 0 8 16 24 32
+ * | Seq | Datalen | Errno | Rsvd |
+ *
+ * These fields are taken directly out of the standard MCDI header, i.e.,
+ * LEVEL==ERR, Datalen == 0 => Reboot
+ *
+ * Events can be squirted out of the UART (using LOG_CTRL) without a
+ * MCDI header. An event can be distinguished from a MCDI response by
+ * examining the first byte which is 0xc0. This corresponds to the
+ * non-existent MCDI command MC_CMD_DEBUG_LOG.
+ *
+ * 0 7 8
+ * | command | Resync | = 0xc0
+ *
+ * Since the event is written in big-endian byte order, this works
+ * providing bits 56-63 of the event are 0xc0.
+ *
+ * 56 60 63
+ * | Rsvd | Code | = 0xc0
+ *
+ * Which means for convenience the event code is 0xc for all MC
+ * generated events.
+ */
+
+/*
+ * the errno value may be followed by the (0-based) number of the
+ * first argument that could not be processed.
+ */
+#define MC_CMD_ERR_ARG_OFST 4
+
+/* MC_CMD_ERR MCDI error codes. */
+/* Operation not permitted. */
+#define MC_CMD_ERR_EPERM 0x1
+/* Non-existent command target */
+#define MC_CMD_ERR_ENOENT 0x2
+/* assert() has killed the MC */
+#define MC_CMD_ERR_EINTR 0x4
+/* I/O failure */
+#define MC_CMD_ERR_EIO 0x5
+/* Already exists */
+#define MC_CMD_ERR_EEXIST 0x6
+/* Try again */
+#define MC_CMD_ERR_EAGAIN 0xb
+/* Out of memory */
+#define MC_CMD_ERR_ENOMEM 0xc
+/* Caller does not hold required locks */
+#define MC_CMD_ERR_EACCES 0xd
+/* Resource is currently unavailable (e.g. lock contention) */
+#define MC_CMD_ERR_EBUSY 0x10
+/* No such device */
+#define MC_CMD_ERR_ENODEV 0x13
+/* Invalid argument to target */
+#define MC_CMD_ERR_EINVAL 0x16
+/* No space */
+#define MC_CMD_ERR_ENOSPC 0x1c
+/* Read-only */
+#define MC_CMD_ERR_EROFS 0x1e
+/* Broken pipe */
+#define MC_CMD_ERR_EPIPE 0x20
+/* Out of range */
+#define MC_CMD_ERR_ERANGE 0x22
+/* Non-recursive resource is already acquired */
+#define MC_CMD_ERR_EDEADLK 0x23
+/* Operation not implemented */
+#define MC_CMD_ERR_ENOSYS 0x26
+/* Operation timed out */
+#define MC_CMD_ERR_ETIME 0x3e
+/* Link has been severed */
+#define MC_CMD_ERR_ENOLINK 0x43
+/* Protocol error */
+#define MC_CMD_ERR_EPROTO 0x47
+/* Bad message */
+#define MC_CMD_ERR_EBADMSG 0x4a
+/* Operation not supported */
+#define MC_CMD_ERR_ENOTSUP 0x5f
+/* Address not available */
+#define MC_CMD_ERR_EADDRNOTAVAIL 0x63
+/* Not connected */
+#define MC_CMD_ERR_ENOTCONN 0x6b
+/* Operation already in progress */
+#define MC_CMD_ERR_EALREADY 0x72
+/* Stale handle. The handle references resource that no longer exists */
+#define MC_CMD_ERR_ESTALE 0x74
+/* Resource allocation failed. */
+#define MC_CMD_ERR_ALLOC_FAIL 0x1000
+/* V-adaptor not found. */
+#define MC_CMD_ERR_NO_VADAPTOR 0x1001
+/* EVB port not found. */
+#define MC_CMD_ERR_NO_EVB_PORT 0x1002
+/* V-switch not found. */
+#define MC_CMD_ERR_NO_VSWITCH 0x1003
+/* Too many VLAN tags. */
+#define MC_CMD_ERR_VLAN_LIMIT 0x1004
+/* Bad PCI function number. */
+#define MC_CMD_ERR_BAD_PCI_FUNC 0x1005
+/* Invalid VLAN mode. */
+#define MC_CMD_ERR_BAD_VLAN_MODE 0x1006
+/* Invalid v-switch type. */
+#define MC_CMD_ERR_BAD_VSWITCH_TYPE 0x1007
+/* Invalid v-port type. */
+#define MC_CMD_ERR_BAD_VPORT_TYPE 0x1008
+/* MAC address exists. */
+#define MC_CMD_ERR_MAC_EXIST 0x1009
+/* Slave core not present */
+#define MC_CMD_ERR_SLAVE_NOT_PRESENT 0x100a
+/* The datapath is disabled. */
+#define MC_CMD_ERR_DATAPATH_DISABLED 0x100b
+/* The requesting client is not a function */
+#define MC_CMD_ERR_CLIENT_NOT_FN 0x100c
+/*
+ * The requested operation might require the command to be passed between
+ * MCs, and the transport doesn't support that. Should only ever been seen over
+ * the UART.
+ */
+#define MC_CMD_ERR_NO_PRIVILEGE 0x1013
+/*
+ * Workaround 26807 could not be turned on/off because some functions
+ * have already installed filters. See the comment at
+ * MC_CMD_WORKAROUND_BUG26807. May also returned for other operations such as
+ * sub-variant switching.
+ */
+#define MC_CMD_ERR_FILTERS_PRESENT 0x1014
+/* The clock whose frequency you've attempted to set doesn't exist */
+#define MC_CMD_ERR_NO_CLOCK 0x1015
+/*
+ * Returned by MC_CMD_TESTASSERT if the action that should have caused an
+ * assertion failed to do so.
+ */
+#define MC_CMD_ERR_UNREACHABLE 0x1016
+/*
+ * This command needs to be processed in the background but there were no
+ * resources to do so. Send it again after a command has completed.
+ */
+#define MC_CMD_ERR_QUEUE_FULL 0x1017
+/*
+ * The operation could not be completed because the PCIe link has gone
+ * away. This error code is never expected to be returned over the TLP
+ * transport.
+ */
+#define MC_CMD_ERR_NO_PCIE 0x1018
+/*
+ * The operation could not be completed because the datapath has gone
+ * away. This is distinct from MC_CMD_ERR_DATAPATH_DISABLED in that the
+ * datapath absence may be temporary
+ */
+#define MC_CMD_ERR_NO_DATAPATH 0x1019
+/* The operation could not complete because some VIs are allocated */
+#define MC_CMD_ERR_VIS_PRESENT 0x101a
+/*
+ * The operation could not complete because some PIO buffers are
+ * allocated
+ */
+#define MC_CMD_ERR_PIOBUFS_PRESENT 0x101b
+
+/***********************************/
+/*
+ * MC_CMD_CDX_BUS_ENUM_BUSES
+ * CDX bus hosts devices (functions) that are implemented using the Composable
+ * DMA subsystem and directly mapped into the memory space of the FGPA PSX
+ * Application Processors (APUs). As such, they only apply to the PSX APU side,
+ * not the host (PCIe). Unlike PCIe, these devices have no native configuration
+ * space or enumeration mechanism, so this message set provides a minimal
+ * interface for discovery and management (bus reset, FLR, BME) of such
+ * devices. This command returns the number of CDX buses present in the system.
+ */
+#define MC_CMD_CDX_BUS_ENUM_BUSES 0x1
+#define MC_CMD_CDX_BUS_ENUM_BUSES_MSGSET 0x1
+#undef MC_CMD_0x1_PRIVILEGE_CTG
+
+#define MC_CMD_0x1_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_BUS_ENUM_BUSES_IN msgrequest */
+#define MC_CMD_CDX_BUS_ENUM_BUSES_IN_LEN 0
+
+/* MC_CMD_CDX_BUS_ENUM_BUSES_OUT msgresponse */
+#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN 4
+/*
+ * Number of CDX buses present in the system. Buses are numbered 0 to
+ * BUS_COUNT-1
+ */
+#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_OFST 0
+#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_LEN 4
+
+/***********************************/
+/*
+ * MC_CMD_CDX_BUS_ENUM_DEVICES
+ * Enumerate CDX bus devices on a given bus
+ */
+#define MC_CMD_CDX_BUS_ENUM_DEVICES 0x2
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_MSGSET 0x2
+#undef MC_CMD_0x2_PRIVILEGE_CTG
+
+#define MC_CMD_0x2_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_BUS_ENUM_DEVICES_IN msgrequest */
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN 4
+/*
+ * Bus number to enumerate, in range 0 to BUS_COUNT-1, as returned by
+ * MC_CMD_CDX_BUS_ENUM_BUSES_OUT
+ */
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_OFST 0
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_LEN 4
+
+/* MC_CMD_CDX_BUS_ENUM_DEVICES_OUT msgresponse */
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN 4
+/*
+ * Number of devices present on the bus. Devices on the bus are numbered 0 to
+ * DEVICE_COUNT-1. Returns EAGAIN if number of devices unknown or if the target
+ * devices are not ready (e.g. undergoing a bus reset)
+ */
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_OFST 0
+#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_LEN 4
+
+/***********************************/
+/*
+ * MC_CMD_CDX_BUS_GET_DEVICE_CONFIG
+ * Returns device identification and MMIO/MSI resource data for a CDX device.
+ * The expected usage is for the caller to first retrieve the number of devices
+ * on the bus using MC_CMD_BUS_ENUM_DEVICES, then loop through the range (0,
+ * DEVICE_COUNT - 1), retrieving device resource data. May return EAGAIN if the
+ * number of exposed devices or device resources change during enumeration (due
+ * to e.g. a PL reload / bus reset), in which case the caller is expected to
+ * restart the enumeration loop. MMIO addresses are specified in terms of bus
+ * addresses (prior to any potential IOMMU translation). For versal-net, these
+ * are equivalent to APU physical addresses. Implementation note - for this to
+ * work, the implementation needs to keep state (generation count) per client.
+ */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG 0x3
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_MSGSET 0x3
+#undef MC_CMD_0x3_PRIVILEGE_CTG
+
+#define MC_CMD_0x3_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN msgrequest */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN 8
+/* Device bus number, in range 0 to BUS_COUNT-1 */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_OFST 0
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_LEN 4
+/* Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_OFST 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_LEN 4
+
+/* MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT msgresponse */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_LEN 88
+/* 16-bit Vendor identifier, compliant with PCI-SIG VendorID assignment. */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_OFST 0
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_LEN 2
+/* 16-bit Device ID assigned by the vendor */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_OFST 2
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_LEN 2
+/*
+ * 16-bit Subsystem Vendor ID, , compliant with PCI-SIG VendorID assignment.
+ * For further device differentiation, as required. 0 if unused.
+ */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_OFST 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_LEN 2
+/*
+ * 16-bit Subsystem Device ID assigned by the vendor. For further device
+ * differentiation, as required. 0 if unused.
+ */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_OFST 6
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_LEN 2
+/* 24-bit Device Class code, compliant with PCI-SIG Device Class codes */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_OFST 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_LEN 3
+/* 8-bit vendor-assigned revision */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_OFST 11
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_LEN 1
+/* Reserved (alignment) */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_OFST 12
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_LEN 4
+/* MMIO region 0 base address (bus address), 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_OFST 16
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_OFST 16
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LBN 128
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_OFST 20
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LBN 160
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_WIDTH 32
+/* MMIO region 0 size, 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_OFST 24
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_OFST 24
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LBN 192
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_OFST 28
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LBN 224
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_WIDTH 32
+/* MMIO region 1 base address (bus address), 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_OFST 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_OFST 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LBN 256
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_OFST 36
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LBN 288
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_WIDTH 32
+/* MMIO region 1 size, 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_OFST 40
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_OFST 40
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LBN 320
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_OFST 44
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LBN 352
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_WIDTH 32
+/* MMIO region 2 base address (bus address), 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_OFST 48
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_OFST 48
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LBN 384
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_OFST 52
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LBN 416
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_WIDTH 32
+/* MMIO region 2 size, 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_OFST 56
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_OFST 56
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LBN 448
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_OFST 60
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LBN 480
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_WIDTH 32
+/* MMIO region 3 base address (bus address), 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_OFST 64
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_OFST 64
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LBN 512
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_OFST 68
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LBN 544
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_WIDTH 32
+/* MMIO region 3 size, 0 if unused */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_OFST 72
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LEN 8
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_OFST 72
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LBN 576
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_WIDTH 32
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_OFST 76
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LEN 4
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LBN 608
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_WIDTH 32
+/* MSI vector count */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_OFST 80
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_LEN 4
+/* Requester ID used by device (SMMU StreamID, GIC ITS DeviceID) */
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_OFST 84
+#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_LEN 4
+
+/***********************************/
+/*
+ * MC_CMD_CDX_DEVICE_RESET
+ * After this call completes, device DMA and interrupts are quiesced, devices
+ * logic is reset in a hardware-specific way and DMA bus mastering is disabled.
+ */
+#define MC_CMD_CDX_DEVICE_RESET 0x6
+#define MC_CMD_CDX_DEVICE_RESET_MSGSET 0x6
+#undef MC_CMD_0x6_PRIVILEGE_CTG
+
+#define MC_CMD_0x6_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_DEVICE_RESET_IN msgrequest */
+#define MC_CMD_CDX_DEVICE_RESET_IN_LEN 8
+/* Device bus number, in range 0 to BUS_COUNT-1 */
+#define MC_CMD_CDX_DEVICE_RESET_IN_BUS_OFST 0
+#define MC_CMD_CDX_DEVICE_RESET_IN_BUS_LEN 4
+/* Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus */
+#define MC_CMD_CDX_DEVICE_RESET_IN_DEVICE_OFST 4
+#define MC_CMD_CDX_DEVICE_RESET_IN_DEVICE_LEN 4
+
+/*
+ * MC_CMD_CDX_DEVICE_RESET_OUT msgresponse: The device is quiesced and all
+ * pending device initiated DMA has completed.
+ */
+#define MC_CMD_CDX_DEVICE_RESET_OUT_LEN 0
+
+/***********************************/
+/*
+ * MC_CMD_CDX_DEVICE_CONTROL_SET
+ * If BUS_MASTER is set to disabled, device DMA and interrupts are quiesced.
+ * Pending DMA requests and MSI interrupts are flushed and no further DMA or
+ * interrupts are issued after this command returns. If BUS_MASTER is set to
+ * enabled, device is allowed to initiate DMA. Whether interrupts are enabled
+ * also depends on the value of MSI_ENABLE bit. Note that, in this case, the
+ * device may start DMA before the host receives and processes the MCDI
+ * response. MSI_ENABLE masks or unmasks device interrupts only. Note that for
+ * interrupts to be delivered to the host, both BUS_MASTER and MSI_ENABLE needs
+ * to be set. MMIO_REGIONS_ENABLE enables or disables host accesses to device
+ * MMIO regions. Note that an implementation is allowed to permanently set this
+ * bit to 1, in which case MC_CMD_CDX_DEVICE_CONTROL_GET will always return 1
+ * for this bit, regardless of the value set here.
+ */
+#define MC_CMD_CDX_DEVICE_CONTROL_SET 0x7
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_MSGSET 0x7
+#undef MC_CMD_0x7_PRIVILEGE_CTG
+
+#define MC_CMD_0x7_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_DEVICE_CONTROL_SET_IN msgrequest */
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_LEN 12
+/* Device bus number, in range 0 to BUS_COUNT-1 */
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_BUS_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_BUS_LEN 4
+/* Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus */
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_DEVICE_OFST 4
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_DEVICE_LEN 4
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_FLAGS_OFST 8
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_FLAGS_LEN 4
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_BUS_MASTER_ENABLE_OFST 8
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_BUS_MASTER_ENABLE_LBN 0
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_BUS_MASTER_ENABLE_WIDTH 1
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MSI_ENABLE_OFST 8
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MSI_ENABLE_LBN 1
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MSI_ENABLE_WIDTH 1
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MMIO_REGIONS_ENABLE_OFST 8
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MMIO_REGIONS_ENABLE_LBN 2
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_IN_MMIO_REGIONS_ENABLE_WIDTH 1
+
+/* MC_CMD_CDX_DEVICE_CONTROL_SET_OUT msgresponse */
+#define MC_CMD_CDX_DEVICE_CONTROL_SET_OUT_LEN 0
+
+/***********************************/
+/*
+ * MC_CMD_CDX_DEVICE_CONTROL_GET
+ * Returns device DMA, interrupt and MMIO region access control bits. See
+ * MC_CMD_CDX_DEVICE_CONTROL_SET for definition of the available control bits.
+ */
+#define MC_CMD_CDX_DEVICE_CONTROL_GET 0x8
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_MSGSET 0x8
+#undef MC_CMD_0x8_PRIVILEGE_CTG
+
+#define MC_CMD_0x8_PRIVILEGE_CTG SRIOV_CTG_ADMIN
+
+/* MC_CMD_CDX_DEVICE_CONTROL_GET_IN msgrequest */
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_IN_LEN 8
+/* Device bus number, in range 0 to BUS_COUNT-1 */
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_IN_BUS_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_IN_BUS_LEN 4
+/* Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus */
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_IN_DEVICE_OFST 4
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_IN_DEVICE_LEN 4
+
+/* MC_CMD_CDX_DEVICE_CONTROL_GET_OUT msgresponse */
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_LEN 4
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_FLAGS_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_FLAGS_LEN 4
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_BUS_MASTER_ENABLE_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_BUS_MASTER_ENABLE_LBN 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_BUS_MASTER_ENABLE_WIDTH 1
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MSI_ENABLE_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MSI_ENABLE_LBN 1
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MSI_ENABLE_WIDTH 1
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MMIO_REGIONS_ENABLE_OFST 0
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MMIO_REGIONS_ENABLE_LBN 2
+#define MC_CMD_CDX_DEVICE_CONTROL_GET_OUT_MMIO_REGIONS_ENABLE_WIDTH 1
+
+/***********************************/
+/* MC_CMD_V2_EXTN - Encapsulation for a v2 extended command */
+#define MC_CMD_V2_EXTN 0x7f
+
+/* MC_CMD_V2_EXTN_IN msgrequest */
+#define MC_CMD_V2_EXTN_IN_LEN 4
+/* the extended command number */
+#define MC_CMD_V2_EXTN_IN_EXTENDED_CMD_LBN 0
+#define MC_CMD_V2_EXTN_IN_EXTENDED_CMD_WIDTH 15
+#define MC_CMD_V2_EXTN_IN_UNUSED_LBN 15
+#define MC_CMD_V2_EXTN_IN_UNUSED_WIDTH 1
+/* the actual length of the encapsulated command */
+#define MC_CMD_V2_EXTN_IN_ACTUAL_LEN_LBN 16
+#define MC_CMD_V2_EXTN_IN_ACTUAL_LEN_WIDTH 10
+#define MC_CMD_V2_EXTN_IN_UNUSED2_LBN 26
+#define MC_CMD_V2_EXTN_IN_UNUSED2_WIDTH 2
+/* Type of command/response */
+#define MC_CMD_V2_EXTN_IN_MESSAGE_TYPE_LBN 28
+#define MC_CMD_V2_EXTN_IN_MESSAGE_TYPE_WIDTH 4
+/*
+ * enum: MCDI command directed to versal-net. MCDI responses of this type
+ * are not defined.
+ */
+#define MC_CMD_V2_EXTN_IN_MCDI_MESSAGE_TYPE_PLATFORM 0x2
+
+#endif /* MC_CDX_PCOL_H */
diff --git a/drivers/cdx/controller/mcdi.c b/drivers/cdx/controller/mcdi.c
new file mode 100644
index 000000000000..a211a2ca762e
--- /dev/null
+++ b/drivers/cdx/controller/mcdi.c
@@ -0,0 +1,903 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Management-Controller-to-Driver Interface
+ *
+ * Copyright 2008-2013 Solarflare Communications Inc.
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_vlan.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/rwsem.h>
+#include <linux/vmalloc.h>
+#include <net/netevent.h>
+#include <linux/log2.h>
+#include <linux/net_tstamp.h>
+#include <linux/wait.h>
+
+#include "bitfield.h"
+#include "mcdi.h"
+
+struct cdx_mcdi_copy_buffer {
+ struct cdx_dword buffer[DIV_ROUND_UP(MCDI_CTL_SDU_LEN_MAX, 4)];
+};
+
+#ifdef CONFIG_MCDI_LOGGING
+#define LOG_LINE_MAX (1024 - 32)
+#endif
+
+static void cdx_mcdi_cancel_cmd(struct cdx_mcdi *cdx, struct cdx_mcdi_cmd *cmd);
+static void cdx_mcdi_wait_for_cleanup(struct cdx_mcdi *cdx);
+static int cdx_mcdi_rpc_async_internal(struct cdx_mcdi *cdx,
+ struct cdx_mcdi_cmd *cmd,
+ unsigned int *handle);
+static void cdx_mcdi_start_or_queue(struct cdx_mcdi_iface *mcdi,
+ bool allow_retry);
+static void cdx_mcdi_cmd_start_or_queue(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd);
+static bool cdx_mcdi_complete_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct cdx_dword *outbuf,
+ int len,
+ struct list_head *cleanup_list);
+static void cdx_mcdi_timeout_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct list_head *cleanup_list);
+static void cdx_mcdi_cmd_work(struct work_struct *context);
+static void cdx_mcdi_mode_fail(struct cdx_mcdi *cdx, struct list_head *cleanup_list);
+static void _cdx_mcdi_display_error(struct cdx_mcdi *cdx, unsigned int cmd,
+ size_t inlen, int raw, int arg, int err_no);
+
+static bool cdx_cmd_cancelled(struct cdx_mcdi_cmd *cmd)
+{
+ return cmd->state == MCDI_STATE_RUNNING_CANCELLED;
+}
+
+static void cdx_mcdi_cmd_release(struct kref *ref)
+{
+ kfree(container_of(ref, struct cdx_mcdi_cmd, ref));
+}
+
+static unsigned int cdx_mcdi_cmd_handle(struct cdx_mcdi_cmd *cmd)
+{
+ return cmd->handle;
+}
+
+static void _cdx_mcdi_remove_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct list_head *cleanup_list)
+{
+ /* if cancelled, the completers have already been called */
+ if (cdx_cmd_cancelled(cmd))
+ return;
+
+ if (cmd->completer) {
+ list_add_tail(&cmd->cleanup_list, cleanup_list);
+ ++mcdi->outstanding_cleanups;
+ kref_get(&cmd->ref);
+ }
+}
+
+static void cdx_mcdi_remove_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct list_head *cleanup_list)
+{
+ list_del(&cmd->list);
+ _cdx_mcdi_remove_cmd(mcdi, cmd, cleanup_list);
+ cmd->state = MCDI_STATE_FINISHED;
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ if (list_empty(&mcdi->cmd_list))
+ wake_up(&mcdi->cmd_complete_wq);
+}
+
+static unsigned long cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
+{
+ if (!cdx->mcdi_ops->mcdi_rpc_timeout)
+ return MCDI_RPC_TIMEOUT;
+ else
+ return cdx->mcdi_ops->mcdi_rpc_timeout(cdx, cmd);
+}
+
+int cdx_mcdi_init(struct cdx_mcdi *cdx)
+{
+ struct cdx_mcdi_iface *mcdi;
+ int rc = -ENOMEM;
+
+ cdx->mcdi = kzalloc(sizeof(*cdx->mcdi), GFP_KERNEL);
+ if (!cdx->mcdi)
+ goto fail;
+
+ mcdi = cdx_mcdi_if(cdx);
+ mcdi->cdx = cdx;
+
+#ifdef CONFIG_MCDI_LOGGING
+ mcdi->logging_buffer = kmalloc(LOG_LINE_MAX, GFP_KERNEL);
+ if (!mcdi->logging_buffer)
+ goto fail2;
+#endif
+ mcdi->workqueue = alloc_ordered_workqueue("mcdi_wq", 0);
+ if (!mcdi->workqueue)
+ goto fail3;
+ mutex_init(&mcdi->iface_lock);
+ mcdi->mode = MCDI_MODE_EVENTS;
+ INIT_LIST_HEAD(&mcdi->cmd_list);
+ init_waitqueue_head(&mcdi->cmd_complete_wq);
+
+ mcdi->new_epoch = true;
+
+ return 0;
+fail3:
+#ifdef CONFIG_MCDI_LOGGING
+ kfree(mcdi->logging_buffer);
+fail2:
+#endif
+ kfree(cdx->mcdi);
+ cdx->mcdi = NULL;
+fail:
+ return rc;
+}
+
+void cdx_mcdi_finish(struct cdx_mcdi *cdx)
+{
+ struct cdx_mcdi_iface *mcdi;
+
+ mcdi = cdx_mcdi_if(cdx);
+ if (!mcdi)
+ return;
+
+ cdx_mcdi_wait_for_cleanup(cdx);
+
+#ifdef CONFIG_MCDI_LOGGING
+ kfree(mcdi->logging_buffer);
+#endif
+
+ destroy_workqueue(mcdi->workqueue);
+ kfree(cdx->mcdi);
+ cdx->mcdi = NULL;
+}
+
+static bool cdx_mcdi_flushed(struct cdx_mcdi_iface *mcdi, bool ignore_cleanups)
+{
+ bool flushed;
+
+ mutex_lock(&mcdi->iface_lock);
+ flushed = list_empty(&mcdi->cmd_list) &&
+ (ignore_cleanups || !mcdi->outstanding_cleanups);
+ mutex_unlock(&mcdi->iface_lock);
+ return flushed;
+}
+
+/* Wait for outstanding MCDI commands to complete. */
+static void cdx_mcdi_wait_for_cleanup(struct cdx_mcdi *cdx)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+
+ if (!mcdi)
+ return;
+
+ wait_event(mcdi->cmd_complete_wq,
+ cdx_mcdi_flushed(mcdi, false));
+}
+
+int cdx_mcdi_wait_for_quiescence(struct cdx_mcdi *cdx,
+ unsigned int timeout_jiffies)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+ DEFINE_WAIT_FUNC(wait, woken_wake_function);
+ int rc = 0;
+
+ if (!mcdi)
+ return -EINVAL;
+
+ flush_workqueue(mcdi->workqueue);
+
+ add_wait_queue(&mcdi->cmd_complete_wq, &wait);
+
+ while (!cdx_mcdi_flushed(mcdi, true)) {
+ rc = wait_woken(&wait, TASK_IDLE, timeout_jiffies);
+ if (rc)
+ continue;
+ break;
+ }
+
+ remove_wait_queue(&mcdi->cmd_complete_wq, &wait);
+
+ if (rc > 0)
+ rc = 0;
+ else if (rc == 0)
+ rc = -ETIMEDOUT;
+
+ return rc;
+}
+
+static u8 cdx_mcdi_payload_csum(const struct cdx_dword *hdr, size_t hdr_len,
+ const struct cdx_dword *sdu, size_t sdu_len)
+{
+ u8 *p = (u8 *)hdr;
+ u8 csum = 0;
+ int i;
+
+ for (i = 0; i < hdr_len; i++)
+ csum += p[i];
+
+ p = (u8 *)sdu;
+ for (i = 0; i < sdu_len; i++)
+ csum += p[i];
+
+ return ~csum & 0xff;
+}
+
+static void cdx_mcdi_send_request(struct cdx_mcdi *cdx,
+ struct cdx_mcdi_cmd *cmd)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+ const struct cdx_dword *inbuf = cmd->inbuf;
+ size_t inlen = cmd->inlen;
+ struct cdx_dword hdr[2];
+ size_t hdr_len;
+ bool not_epoch;
+ u32 xflags;
+#ifdef CONFIG_MCDI_LOGGING
+ char *buf;
+#endif
+
+ if (!mcdi)
+ return;
+#ifdef CONFIG_MCDI_LOGGING
+ buf = mcdi->logging_buffer; /* page-sized */
+#endif
+
+ mcdi->prev_seq = cmd->seq;
+ mcdi->seq_held_by[cmd->seq] = cmd;
+ mcdi->db_held_by = cmd;
+ cmd->started = jiffies;
+
+ not_epoch = !mcdi->new_epoch;
+ xflags = 0;
+
+ /* MCDI v2 */
+ WARN_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
+ CDX_POPULATE_DWORD_7(hdr[0],
+ MCDI_HEADER_RESPONSE, 0,
+ MCDI_HEADER_RESYNC, 1,
+ MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
+ MCDI_HEADER_DATALEN, 0,
+ MCDI_HEADER_SEQ, cmd->seq,
+ MCDI_HEADER_XFLAGS, xflags,
+ MCDI_HEADER_NOT_EPOCH, not_epoch);
+ CDX_POPULATE_DWORD_3(hdr[1],
+ MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd->cmd,
+ MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen,
+ MC_CMD_V2_EXTN_IN_MESSAGE_TYPE,
+ MC_CMD_V2_EXTN_IN_MCDI_MESSAGE_TYPE_PLATFORM);
+ hdr_len = 8;
+
+#ifdef CONFIG_MCDI_LOGGING
+ if (!WARN_ON_ONCE(!buf)) {
+ const struct cdx_dword *frags[] = { hdr, inbuf };
+ const size_t frag_len[] = { hdr_len, round_up(inlen, 4) };
+ int bytes = 0;
+ int i, j;
+
+ for (j = 0; j < ARRAY_SIZE(frags); j++) {
+ const struct cdx_dword *frag;
+
+ frag = frags[j];
+ for (i = 0;
+ i < frag_len[j] / 4;
+ i++) {
+ /*
+ * Do not exceed the internal printk limit.
+ * The string before that is just over 70 bytes.
+ */
+ if ((bytes + 75) > LOG_LINE_MAX) {
+ pr_info("MCDI RPC REQ:%s \\\n", buf);
+ bytes = 0;
+ }
+ bytes += snprintf(buf + bytes,
+ LOG_LINE_MAX - bytes, " %08x",
+ le32_to_cpu(frag[i].cdx_u32));
+ }
+ }
+
+ pr_info("MCDI RPC REQ:%s\n", buf);
+ }
+#endif
+ hdr[0].cdx_u32 |= (__force __le32)(cdx_mcdi_payload_csum(hdr, hdr_len, inbuf, inlen) <<
+ MCDI_HEADER_XFLAGS_LBN);
+ cdx->mcdi_ops->mcdi_request(cdx, hdr, hdr_len, inbuf, inlen);
+
+ mcdi->new_epoch = false;
+}
+
+static int cdx_mcdi_errno(struct cdx_mcdi *cdx, unsigned int mcdi_err)
+{
+ switch (mcdi_err) {
+ case 0:
+ case MC_CMD_ERR_QUEUE_FULL:
+ return mcdi_err;
+ case MC_CMD_ERR_EPERM:
+ return -EPERM;
+ case MC_CMD_ERR_ENOENT:
+ return -ENOENT;
+ case MC_CMD_ERR_EINTR:
+ return -EINTR;
+ case MC_CMD_ERR_EAGAIN:
+ return -EAGAIN;
+ case MC_CMD_ERR_EACCES:
+ return -EACCES;
+ case MC_CMD_ERR_EBUSY:
+ return -EBUSY;
+ case MC_CMD_ERR_EINVAL:
+ return -EINVAL;
+ case MC_CMD_ERR_ERANGE:
+ return -ERANGE;
+ case MC_CMD_ERR_EDEADLK:
+ return -EDEADLK;
+ case MC_CMD_ERR_ENOSYS:
+ return -EOPNOTSUPP;
+ case MC_CMD_ERR_ETIME:
+ return -ETIME;
+ case MC_CMD_ERR_EALREADY:
+ return -EALREADY;
+ case MC_CMD_ERR_ENOSPC:
+ return -ENOSPC;
+ case MC_CMD_ERR_ENOMEM:
+ return -ENOMEM;
+ case MC_CMD_ERR_ENOTSUP:
+ return -EOPNOTSUPP;
+ case MC_CMD_ERR_ALLOC_FAIL:
+ return -ENOBUFS;
+ case MC_CMD_ERR_MAC_EXIST:
+ return -EADDRINUSE;
+ case MC_CMD_ERR_NO_EVB_PORT:
+ return -EAGAIN;
+ default:
+ return -EPROTO;
+ }
+}
+
+static void cdx_mcdi_process_cleanup_list(struct cdx_mcdi *cdx,
+ struct list_head *cleanup_list)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+ unsigned int cleanups = 0;
+
+ if (!mcdi)
+ return;
+
+ while (!list_empty(cleanup_list)) {
+ struct cdx_mcdi_cmd *cmd =
+ list_first_entry(cleanup_list,
+ struct cdx_mcdi_cmd, cleanup_list);
+ cmd->completer(cdx, cmd->cookie, cmd->rc,
+ cmd->outbuf, cmd->outlen);
+ list_del(&cmd->cleanup_list);
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ ++cleanups;
+ }
+
+ if (cleanups) {
+ bool all_done;
+
+ mutex_lock(&mcdi->iface_lock);
+ CDX_WARN_ON_PARANOID(cleanups > mcdi->outstanding_cleanups);
+ all_done = (mcdi->outstanding_cleanups -= cleanups) == 0;
+ mutex_unlock(&mcdi->iface_lock);
+ if (all_done)
+ wake_up(&mcdi->cmd_complete_wq);
+ }
+}
+
+static void _cdx_mcdi_cancel_cmd(struct cdx_mcdi_iface *mcdi,
+ unsigned int handle,
+ struct list_head *cleanup_list)
+{
+ struct cdx_mcdi_cmd *cmd;
+
+ list_for_each_entry(cmd, &mcdi->cmd_list, list)
+ if (cdx_mcdi_cmd_handle(cmd) == handle) {
+ switch (cmd->state) {
+ case MCDI_STATE_QUEUED:
+ case MCDI_STATE_RETRY:
+ pr_debug("command %#x inlen %zu cancelled in queue\n",
+ cmd->cmd, cmd->inlen);
+ /* if not yet running, properly cancel it */
+ cmd->rc = -EPIPE;
+ cdx_mcdi_remove_cmd(mcdi, cmd, cleanup_list);
+ break;
+ case MCDI_STATE_RUNNING:
+ case MCDI_STATE_RUNNING_CANCELLED:
+ case MCDI_STATE_FINISHED:
+ default:
+ /* invalid state? */
+ WARN_ON(1);
+ }
+ break;
+ }
+}
+
+static void cdx_mcdi_cancel_cmd(struct cdx_mcdi *cdx, struct cdx_mcdi_cmd *cmd)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+ LIST_HEAD(cleanup_list);
+
+ if (!mcdi)
+ return;
+
+ mutex_lock(&mcdi->iface_lock);
+ cdx_mcdi_timeout_cmd(mcdi, cmd, &cleanup_list);
+ mutex_unlock(&mcdi->iface_lock);
+ cdx_mcdi_process_cleanup_list(cdx, &cleanup_list);
+}
+
+struct cdx_mcdi_blocking_data {
+ struct kref ref;
+ bool done;
+ wait_queue_head_t wq;
+ int rc;
+ struct cdx_dword *outbuf;
+ size_t outlen;
+ size_t outlen_actual;
+};
+
+static void cdx_mcdi_blocking_data_release(struct kref *ref)
+{
+ kfree(container_of(ref, struct cdx_mcdi_blocking_data, ref));
+}
+
+static void cdx_mcdi_rpc_completer(struct cdx_mcdi *cdx, unsigned long cookie,
+ int rc, struct cdx_dword *outbuf,
+ size_t outlen_actual)
+{
+ struct cdx_mcdi_blocking_data *wait_data =
+ (struct cdx_mcdi_blocking_data *)cookie;
+
+ wait_data->rc = rc;
+ memcpy(wait_data->outbuf, outbuf,
+ min(outlen_actual, wait_data->outlen));
+ wait_data->outlen_actual = outlen_actual;
+ /* memory barrier */
+ smp_wmb();
+ wait_data->done = true;
+ wake_up(&wait_data->wq);
+ kref_put(&wait_data->ref, cdx_mcdi_blocking_data_release);
+}
+
+static int cdx_mcdi_rpc_sync(struct cdx_mcdi *cdx, unsigned int cmd,
+ const struct cdx_dword *inbuf, size_t inlen,
+ struct cdx_dword *outbuf, size_t outlen,
+ size_t *outlen_actual, bool quiet)
+{
+ struct cdx_mcdi_blocking_data *wait_data;
+ struct cdx_mcdi_cmd *cmd_item;
+ unsigned int handle;
+ int rc;
+
+ if (outlen_actual)
+ *outlen_actual = 0;
+
+ wait_data = kmalloc(sizeof(*wait_data), GFP_KERNEL);
+ if (!wait_data)
+ return -ENOMEM;
+
+ cmd_item = kmalloc(sizeof(*cmd_item), GFP_KERNEL);
+ if (!cmd_item) {
+ kfree(wait_data);
+ return -ENOMEM;
+ }
+
+ kref_init(&wait_data->ref);
+ wait_data->done = false;
+ init_waitqueue_head(&wait_data->wq);
+ wait_data->outbuf = outbuf;
+ wait_data->outlen = outlen;
+
+ kref_init(&cmd_item->ref);
+ cmd_item->quiet = quiet;
+ cmd_item->cookie = (unsigned long)wait_data;
+ cmd_item->completer = &cdx_mcdi_rpc_completer;
+ cmd_item->cmd = cmd;
+ cmd_item->inlen = inlen;
+ cmd_item->inbuf = inbuf;
+
+ /* Claim an extra reference for the completer to put. */
+ kref_get(&wait_data->ref);
+ rc = cdx_mcdi_rpc_async_internal(cdx, cmd_item, &handle);
+ if (rc) {
+ kref_put(&wait_data->ref, cdx_mcdi_blocking_data_release);
+ goto out;
+ }
+
+ if (!wait_event_timeout(wait_data->wq, wait_data->done,
+ cdx_mcdi_rpc_timeout(cdx, cmd)) &&
+ !wait_data->done) {
+ pr_err("MC command 0x%x inlen %zu timed out (sync)\n",
+ cmd, inlen);
+
+ cdx_mcdi_cancel_cmd(cdx, cmd_item);
+
+ wait_data->rc = -ETIMEDOUT;
+ wait_data->outlen_actual = 0;
+ }
+
+ if (outlen_actual)
+ *outlen_actual = wait_data->outlen_actual;
+ rc = wait_data->rc;
+
+out:
+ kref_put(&wait_data->ref, cdx_mcdi_blocking_data_release);
+
+ return rc;
+}
+
+static bool cdx_mcdi_get_seq(struct cdx_mcdi_iface *mcdi, unsigned char *seq)
+{
+ *seq = mcdi->prev_seq;
+ do {
+ *seq = (*seq + 1) % ARRAY_SIZE(mcdi->seq_held_by);
+ } while (mcdi->seq_held_by[*seq] && *seq != mcdi->prev_seq);
+ return !mcdi->seq_held_by[*seq];
+}
+
+static int cdx_mcdi_rpc_async_internal(struct cdx_mcdi *cdx,
+ struct cdx_mcdi_cmd *cmd,
+ unsigned int *handle)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+ LIST_HEAD(cleanup_list);
+
+ if (!mcdi) {
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ return -ENETDOWN;
+ }
+
+ if (mcdi->mode == MCDI_MODE_FAIL) {
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ return -ENETDOWN;
+ }
+
+ cmd->mcdi = mcdi;
+ INIT_WORK(&cmd->work, cdx_mcdi_cmd_work);
+ INIT_LIST_HEAD(&cmd->list);
+ INIT_LIST_HEAD(&cmd->cleanup_list);
+ cmd->rc = 0;
+ cmd->outbuf = NULL;
+ cmd->outlen = 0;
+
+ queue_work(mcdi->workqueue, &cmd->work);
+ return 0;
+}
+
+static void cdx_mcdi_cmd_start_or_queue(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd)
+{
+ struct cdx_mcdi *cdx = mcdi->cdx;
+ u8 seq;
+
+ if (!mcdi->db_held_by &&
+ cdx_mcdi_get_seq(mcdi, &seq)) {
+ cmd->seq = seq;
+ cmd->reboot_seen = false;
+ cdx_mcdi_send_request(cdx, cmd);
+ cmd->state = MCDI_STATE_RUNNING;
+ } else {
+ cmd->state = MCDI_STATE_QUEUED;
+ }
+}
+
+/* try to advance other commands */
+static void cdx_mcdi_start_or_queue(struct cdx_mcdi_iface *mcdi,
+ bool allow_retry)
+{
+ struct cdx_mcdi_cmd *cmd, *tmp;
+
+ list_for_each_entry_safe(cmd, tmp, &mcdi->cmd_list, list)
+ if (cmd->state == MCDI_STATE_QUEUED ||
+ (cmd->state == MCDI_STATE_RETRY && allow_retry))
+ cdx_mcdi_cmd_start_or_queue(mcdi, cmd);
+}
+
+void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len)
+{
+ struct cdx_mcdi_iface *mcdi;
+ struct cdx_mcdi_cmd *cmd;
+ LIST_HEAD(cleanup_list);
+ unsigned int respseq;
+
+ if (!len || !outbuf) {
+ pr_err("Got empty MC response\n");
+ return;
+ }
+
+ mcdi = cdx_mcdi_if(cdx);
+ if (!mcdi)
+ return;
+
+ respseq = CDX_DWORD_FIELD(outbuf[0], MCDI_HEADER_SEQ);
+
+ mutex_lock(&mcdi->iface_lock);
+ cmd = mcdi->seq_held_by[respseq];
+
+ if (cmd) {
+ if (cmd->state == MCDI_STATE_FINISHED) {
+ mutex_unlock(&mcdi->iface_lock);
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ return;
+ }
+
+ cdx_mcdi_complete_cmd(mcdi, cmd, outbuf, len, &cleanup_list);
+ } else {
+ pr_err("MC response unexpected for seq : %0X\n", respseq);
+ }
+
+ mutex_unlock(&mcdi->iface_lock);
+
+ cdx_mcdi_process_cleanup_list(mcdi->cdx, &cleanup_list);
+}
+
+static void cdx_mcdi_cmd_work(struct work_struct *context)
+{
+ struct cdx_mcdi_cmd *cmd =
+ container_of(context, struct cdx_mcdi_cmd, work);
+ struct cdx_mcdi_iface *mcdi = cmd->mcdi;
+
+ mutex_lock(&mcdi->iface_lock);
+
+ cmd->handle = mcdi->prev_handle++;
+ list_add_tail(&cmd->list, &mcdi->cmd_list);
+ cdx_mcdi_cmd_start_or_queue(mcdi, cmd);
+
+ mutex_unlock(&mcdi->iface_lock);
+}
+
+/*
+ * Returns true if the MCDI module is finished with the command.
+ * (examples of false would be if the command was proxied, or it was
+ * rejected by the MC due to lack of resources and requeued).
+ */
+static bool cdx_mcdi_complete_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct cdx_dword *outbuf,
+ int len,
+ struct list_head *cleanup_list)
+{
+ size_t resp_hdr_len, resp_data_len;
+ struct cdx_mcdi *cdx = mcdi->cdx;
+ unsigned int respcmd, error;
+ bool completed = false;
+ int rc;
+
+ /* ensure the command can't go away before this function returns */
+ kref_get(&cmd->ref);
+
+ respcmd = CDX_DWORD_FIELD(outbuf[0], MCDI_HEADER_CODE);
+ error = CDX_DWORD_FIELD(outbuf[0], MCDI_HEADER_ERROR);
+
+ if (respcmd != MC_CMD_V2_EXTN) {
+ resp_hdr_len = 4;
+ resp_data_len = CDX_DWORD_FIELD(outbuf[0], MCDI_HEADER_DATALEN);
+ } else {
+ resp_data_len = 0;
+ resp_hdr_len = 8;
+ if (len >= 8)
+ resp_data_len =
+ CDX_DWORD_FIELD(outbuf[1], MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
+ }
+
+ if ((resp_hdr_len + resp_data_len) > len) {
+ pr_warn("Incomplete MCDI response received %d. Expected %zu\n",
+ len, (resp_hdr_len + resp_data_len));
+ resp_data_len = 0;
+ }
+
+#ifdef CONFIG_MCDI_LOGGING
+ if (!WARN_ON_ONCE(!mcdi->logging_buffer)) {
+ char *log = mcdi->logging_buffer;
+ int i, bytes = 0;
+ size_t rlen;
+
+ WARN_ON_ONCE(resp_hdr_len % 4);
+
+ rlen = resp_hdr_len / 4 + DIV_ROUND_UP(resp_data_len, 4);
+
+ for (i = 0; i < rlen; i++) {
+ if ((bytes + 75) > LOG_LINE_MAX) {
+ pr_info("MCDI RPC RESP:%s \\\n", log);
+ bytes = 0;
+ }
+ bytes += snprintf(log + bytes, LOG_LINE_MAX - bytes,
+ " %08x", le32_to_cpu(outbuf[i].cdx_u32));
+ }
+
+ pr_info("MCDI RPC RESP:%s\n", log);
+ }
+#endif
+
+ if (error && resp_data_len == 0) {
+ /* MC rebooted during command */
+ rc = -EIO;
+ } else {
+ if (WARN_ON_ONCE(error && resp_data_len < 4))
+ resp_data_len = 4;
+ if (error) {
+ rc = CDX_DWORD_FIELD(outbuf[resp_hdr_len / 4], CDX_DWORD);
+ if (!cmd->quiet) {
+ int err_arg = 0;
+
+ if (resp_data_len >= MC_CMD_ERR_ARG_OFST + 4) {
+ int offset = (resp_hdr_len + MC_CMD_ERR_ARG_OFST) / 4;
+
+ err_arg = CDX_DWORD_VAL(outbuf[offset]);
+ }
+
+ _cdx_mcdi_display_error(cdx, cmd->cmd,
+ cmd->inlen, rc, err_arg,
+ cdx_mcdi_errno(cdx, rc));
+ }
+ rc = cdx_mcdi_errno(cdx, rc);
+ } else {
+ rc = 0;
+ }
+ }
+
+ /* free doorbell */
+ if (mcdi->db_held_by == cmd)
+ mcdi->db_held_by = NULL;
+
+ if (cdx_cmd_cancelled(cmd)) {
+ list_del(&cmd->list);
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+ completed = true;
+ } else if (rc == MC_CMD_ERR_QUEUE_FULL) {
+ cmd->state = MCDI_STATE_RETRY;
+ } else {
+ cmd->rc = rc;
+ cmd->outbuf = outbuf + DIV_ROUND_UP(resp_hdr_len, 4);
+ cmd->outlen = resp_data_len;
+ cdx_mcdi_remove_cmd(mcdi, cmd, cleanup_list);
+ completed = true;
+ }
+
+ /* free sequence number and buffer */
+ mcdi->seq_held_by[cmd->seq] = NULL;
+
+ cdx_mcdi_start_or_queue(mcdi, rc != MC_CMD_ERR_QUEUE_FULL);
+
+ /* wake up anyone waiting for flush */
+ wake_up(&mcdi->cmd_complete_wq);
+
+ kref_put(&cmd->ref, cdx_mcdi_cmd_release);
+
+ return completed;
+}
+
+static void cdx_mcdi_timeout_cmd(struct cdx_mcdi_iface *mcdi,
+ struct cdx_mcdi_cmd *cmd,
+ struct list_head *cleanup_list)
+{
+ struct cdx_mcdi *cdx = mcdi->cdx;
+
+ pr_err("MC command 0x%x inlen %zu state %d timed out after %u ms\n",
+ cmd->cmd, cmd->inlen, cmd->state,
+ jiffies_to_msecs(jiffies - cmd->started));
+
+ cmd->rc = -ETIMEDOUT;
+ cdx_mcdi_remove_cmd(mcdi, cmd, cleanup_list);
+
+ cdx_mcdi_mode_fail(cdx, cleanup_list);
+}
+
+/**
+ * cdx_mcdi_rpc - Issue an MCDI command and wait for completion
+ * @cdx: NIC through which to issue the command
+ * @cmd: Command type number
+ * @inbuf: Command parameters
+ * @inlen: Length of command parameters, in bytes. Must be a multiple
+ * of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
+ * @outbuf: Response buffer. May be %NULL if @outlen is 0.
+ * @outlen: Length of response buffer, in bytes. If the actual
+ * response is longer than @outlen & ~3, it will be truncated
+ * to that length.
+ * @outlen_actual: Pointer through which to return the actual response
+ * length. May be %NULL if this is not needed.
+ *
+ * This function may sleep and therefore must be called in process
+ * context.
+ *
+ * Return: A negative error code, or zero if successful. The error
+ * code may come from the MCDI response or may indicate a failure
+ * to communicate with the MC. In the former case, the response
+ * will still be copied to @outbuf and *@...len_actual will be
+ * set accordingly. In the latter case, *@...len_actual will be
+ * set to zero.
+ */
+int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd,
+ const struct cdx_dword *inbuf, size_t inlen,
+ struct cdx_dword *outbuf, size_t outlen,
+ size_t *outlen_actual)
+{
+ return cdx_mcdi_rpc_sync(cdx, cmd, inbuf, inlen, outbuf, outlen,
+ outlen_actual, false);
+}
+
+/**
+ * cdx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
+ * @cdx: NIC through which to issue the command
+ * @cmd: Command type number
+ * @inbuf: Command parameters
+ * @inlen: Length of command parameters, in bytes
+ * @complete: Function to be called on completion or cancellation.
+ * @cookie: Arbitrary value to be passed to @complete.
+ *
+ * This function does not sleep and therefore may be called in atomic
+ * context. It will fail if event queues are disabled or if MCDI
+ * event completions have been disabled due to an error.
+ *
+ * If it succeeds, the @complete function will be called exactly once
+ * in process context, when one of the following occurs:
+ * (a) the completion event is received (in process context)
+ * (b) event queues are disabled (in the process that disables them)
+ */
+int
+cdx_mcdi_rpc_async(struct cdx_mcdi *cdx, unsigned int cmd,
+ const struct cdx_dword *inbuf, size_t inlen,
+ cdx_mcdi_async_completer *complete, unsigned long cookie)
+{
+ struct cdx_mcdi_cmd *cmd_item =
+ kmalloc(sizeof(struct cdx_mcdi_cmd) + inlen, GFP_ATOMIC);
+
+ if (!cmd_item)
+ return -ENOMEM;
+
+ kref_init(&cmd_item->ref);
+ cmd_item->quiet = true;
+ cmd_item->cookie = cookie;
+ cmd_item->completer = complete;
+ cmd_item->cmd = cmd;
+ cmd_item->inlen = inlen;
+ /* inbuf is probably not valid after return, so take a copy */
+ cmd_item->inbuf = (struct cdx_dword *)(cmd_item + 1);
+ memcpy(cmd_item + 1, inbuf, inlen);
+
+ return cdx_mcdi_rpc_async_internal(cdx, cmd_item, NULL);
+}
+
+static void _cdx_mcdi_display_error(struct cdx_mcdi *cdx, unsigned int cmd,
+ size_t inlen, int raw, int arg, int err_no)
+{
+ pr_err("MC command 0x%x inlen %d failed err_no=%d (raw=%d) arg=%d\n",
+ cmd, (int)inlen, err_no, raw, arg);
+}
+
+/*
+ * Set MCDI mode to fail to prevent any new commands, then cancel any
+ * outstanding commands.
+ * Caller must hold the mcdi iface_lock.
+ */
+static void cdx_mcdi_mode_fail(struct cdx_mcdi *cdx, struct list_head *cleanup_list)
+{
+ struct cdx_mcdi_iface *mcdi = cdx_mcdi_if(cdx);
+
+ if (!mcdi)
+ return;
+
+ mcdi->mode = MCDI_MODE_FAIL;
+
+ while (!list_empty(&mcdi->cmd_list)) {
+ struct cdx_mcdi_cmd *cmd;
+
+ cmd = list_first_entry(&mcdi->cmd_list, struct cdx_mcdi_cmd,
+ list);
+ _cdx_mcdi_cancel_cmd(mcdi, cdx_mcdi_cmd_handle(cmd), cleanup_list);
+ }
+}
diff --git a/drivers/cdx/controller/mcdi.h b/drivers/cdx/controller/mcdi.h
new file mode 100644
index 000000000000..63933ede33ed
--- /dev/null
+++ b/drivers/cdx/controller/mcdi.h
@@ -0,0 +1,238 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright 2008-2013 Solarflare Communications Inc.
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef CDX_MCDI_H
+#define CDX_MCDI_H
+
+#include <linux/mutex.h>
+#include <linux/kref.h>
+
+#include "bitfield.h"
+#include "mc_cdx_pcol.h"
+
+#ifdef DEBUG
+#define CDX_WARN_ON_ONCE_PARANOID(x) WARN_ON_ONCE(x)
+#define CDX_WARN_ON_PARANOID(x) WARN_ON(x)
+#else
+#define CDX_WARN_ON_ONCE_PARANOID(x) do {} while (0)
+#define CDX_WARN_ON_PARANOID(x) do {} while (0)
+#endif
+
+/**
+ * enum cdx_mcdi_mode - MCDI transaction mode
+ * @MCDI_MODE_EVENTS: wait for an mcdi response callback.
+ * @MCDI_MODE_FAIL: we think MCDI is dead, so fail-fast all calls
+ */
+enum cdx_mcdi_mode {
+ MCDI_MODE_EVENTS,
+ MCDI_MODE_FAIL,
+};
+
+#define MCDI_RPC_TIMEOUT (10 * HZ)
+#define MCDI_RPC_LONG_TIMEOU (60 * HZ)
+#define MCDI_RPC_POST_RST_TIME (10 * HZ)
+
+#define MCDI_BUF_LEN (8 + MCDI_CTL_SDU_LEN_MAX)
+
+/**
+ * enum cdx_mcdi_cmd_state - State for an individual MCDI command
+ * @MCDI_STATE_QUEUED: Command not started and is waiting to run.
+ * @MCDI_STATE_RETRY: Command was submitted and MC rejected with no resources,
+ * as MC have too many outstanding commands. Command will be retried once
+ * another command returns.
+ * @MCDI_STATE_RUNNING: Command was accepted and is running.
+ * @MCDI_STATE_RUNNING_CANCELLED: Command is running but the issuer cancelled
+ * the command.
+ * @MCDI_STATE_FINISHED: Processing of this command has completed.
+ */
+
+enum cdx_mcdi_cmd_state {
+ MCDI_STATE_QUEUED,
+ MCDI_STATE_RETRY,
+ MCDI_STATE_RUNNING,
+ MCDI_STATE_RUNNING_CANCELLED,
+ MCDI_STATE_FINISHED,
+};
+
+/**
+ * struct cdx_mcdi - CDX MCDI Firmware interface, to interact
+ * with CDX controller.
+ * @mcdi: MCDI interface
+ * @mcdi_ops: MCDI operations
+ */
+struct cdx_mcdi {
+ /* MCDI interface */
+ struct cdx_mcdi_data *mcdi;
+ const struct cdx_mcdi_ops *mcdi_ops;
+};
+
+struct cdx_mcdi_ops {
+ void (*mcdi_request)(struct cdx_mcdi *cdx,
+ const struct cdx_dword *hdr, size_t hdr_len,
+ const struct cdx_dword *sdu, size_t sdu_len);
+ unsigned int (*mcdi_rpc_timeout)(struct cdx_mcdi *cdx, unsigned int cmd);
+};
+
+typedef void cdx_mcdi_async_completer(struct cdx_mcdi *cdx,
+ unsigned long cookie, int rc,
+ struct cdx_dword *outbuf,
+ size_t outlen_actual);
+
+/**
+ * struct cdx_mcdi_cmd - An outstanding MCDI command
+ * @ref: Reference count. There will be one reference if the command is
+ * in the mcdi_iface cmd_list, another if it's on a cleanup list,
+ * and a third if it's queued in the work queue.
+ * @list: The data for this entry in mcdi->cmd_list
+ * @cleanup_list: The data for this entry in a cleanup list
+ * @work: The work item for this command, queued in mcdi->workqueue
+ * @mcdi: The mcdi_iface for this command
+ * @state: The state of this command
+ * @inlen: inbuf length
+ * @inbuf: Input buffer
+ * @quiet: Whether to silence errors
+ * @reboot_seen: Whether a reboot has been seen during this command,
+ * to prevent duplicates
+ * @seq: Sequence number
+ * @started: Jiffies this command was started at
+ * @cookie: Context for completion function
+ * @completer: Completion function
+ * @handle: Command handle
+ * @cmd: Command number
+ * @rc: Return code
+ * @outlen: Length of output buffer
+ * @outbuf: Output buffer
+ */
+struct cdx_mcdi_cmd {
+ struct kref ref;
+ struct list_head list;
+ struct list_head cleanup_list;
+ struct work_struct work;
+ struct cdx_mcdi_iface *mcdi;
+ enum cdx_mcdi_cmd_state state;
+ size_t inlen;
+ const struct cdx_dword *inbuf;
+ bool quiet;
+ bool reboot_seen;
+ u8 seq;
+ unsigned long started;
+ unsigned long cookie;
+ cdx_mcdi_async_completer *completer;
+ unsigned int handle;
+ unsigned int cmd;
+ int rc;
+ size_t outlen;
+ struct cdx_dword *outbuf;
+ /* followed by inbuf data if necessary */
+};
+
+/**
+ * struct cdx_mcdi_iface - MCDI protocol context
+ * @cdx: The associated NIC
+ * @iface_lock: Serialise access to this structure
+ * @outstanding_cleanups: Count of cleanups
+ * @cmd_list: List of outstanding and running commands
+ * @workqueue: Workqueue used for delayed processing
+ * @cmd_complete_wq: Waitqueue for command completion
+ * @db_held_by: Command the MC doorbell is in use by
+ * @seq_held_by: Command each sequence number is in use by
+ * @prev_handle: The last used command handle
+ * @mode: Poll for mcdi completion, or wait for an mcdi_event
+ * @prev_seq: The last used sequence number
+ * @new_epoch: Indicates start of day or start of MC reboot recovery
+ * @logging_buffer: Buffer that may be used to build MCDI tracing messages
+ * @logging_enabled: Whether to trace MCDI
+ */
+struct cdx_mcdi_iface {
+ struct cdx_mcdi *cdx;
+ /* Serialise access */
+ struct mutex iface_lock;
+ unsigned int outstanding_cleanups;
+ struct list_head cmd_list;
+ struct workqueue_struct *workqueue;
+ wait_queue_head_t cmd_complete_wq;
+ struct cdx_mcdi_cmd *db_held_by;
+ struct cdx_mcdi_cmd *seq_held_by[16];
+ unsigned int prev_handle;
+ enum cdx_mcdi_mode mode;
+ u8 prev_seq;
+ bool new_epoch;
+#ifdef CONFIG_MCDI_LOGGING
+ bool logging_enabled;
+ char *logging_buffer;
+#endif
+};
+
+/**
+ * struct cdx_mcdi_data - extra state for NICs that implement MCDI
+ * @iface: Interface/protocol state
+ * @fn_flags: Flags for this function, as returned by %MC_CMD_DRV_ATTACH.
+ */
+struct cdx_mcdi_data {
+ struct cdx_mcdi_iface iface;
+ u32 fn_flags;
+};
+
+static inline struct cdx_mcdi_iface *cdx_mcdi_if(struct cdx_mcdi *cdx)
+{
+ return cdx->mcdi ? &cdx->mcdi->iface : NULL;
+}
+
+int cdx_mcdi_init(struct cdx_mcdi *cdx);
+void cdx_mcdi_finish(struct cdx_mcdi *cdx);
+
+void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len);
+int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd,
+ const struct cdx_dword *inbuf, size_t inlen,
+ struct cdx_dword *outbuf, size_t outlen, size_t *outlen_actual);
+int cdx_mcdi_rpc_async(struct cdx_mcdi *cdx, unsigned int cmd,
+ const struct cdx_dword *inbuf, size_t inlen,
+ cdx_mcdi_async_completer *complete,
+ unsigned long cookie);
+int cdx_mcdi_wait_for_quiescence(struct cdx_mcdi *cdx,
+ unsigned int timeout_jiffies);
+
+/*
+ * We expect that 16- and 32-bit fields in MCDI requests and responses
+ * are appropriately aligned, but 64-bit fields are only
+ * 32-bit-aligned.
+ */
+#define MCDI_DECLARE_BUF(_name, _len) struct cdx_dword _name[DIV_ROUND_UP(_len, 4)] = {{0}}
+#define _MCDI_PTR(_buf, _offset) \
+ ((u8 *)(_buf) + (_offset))
+#define MCDI_PTR(_buf, _field) \
+ _MCDI_PTR(_buf, MC_CMD_ ## _field ## _OFST)
+#define _MCDI_CHECK_ALIGN(_ofst, _align) \
+ ((void)BUILD_BUG_ON_ZERO((_ofst) & ((_align) - 1)), \
+ (_ofst))
+#define _MCDI_DWORD(_buf, _field) \
+ ((_buf) + (_MCDI_CHECK_ALIGN(MC_CMD_ ## _field ## _OFST, 4) >> 2))
+
+#define MCDI_BYTE(_buf, _field) \
+ ((void)BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 1), \
+ *MCDI_PTR(_buf, _field))
+#define MCDI_WORD(_buf, _field) \
+ ((void)BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 2), \
+ le16_to_cpu(*(__force const __le16 *)MCDI_PTR(_buf, _field)))
+#define MCDI_SET_DWORD(_buf, _field, _value) \
+ CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field), CDX_DWORD, _value)
+#define MCDI_DWORD(_buf, _field) \
+ CDX_DWORD_FIELD(*_MCDI_DWORD(_buf, _field), CDX_DWORD)
+#define MCDI_POPULATE_DWORD_1(_buf, _field, _name1, _value1) \
+ CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field), \
+ MC_CMD_ ## _name1, _value1)
+#define MCDI_SET_QWORD(_buf, _field, _value) \
+ do { \
+ CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[0], \
+ CDX_DWORD, (u32)(_value)); \
+ CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[1], \
+ CDX_DWORD, (u64)(_value) >> 32); \
+ } while (0)
+#define MCDI_QWORD(_buf, _field) \
+ (CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[0], CDX_DWORD) | \
+ (u64)CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[1], CDX_DWORD) << 32)
+
+#endif /* CDX_MCDI_H */
--
2.17.1
Powered by blists - more mailing lists