Merge branch 'pds_core'

Shannon Nelson says:

====================
pds_core driver

Summary:
--------
This patchset implements a new driver for use with the AMD/Pensando
Distributed Services Card (DSC), intended to provide core configuration
services through the auxiliary_bus and through a couple of EXPORTed
functions for use initially in VFio and vDPA feature specific drivers.

To keep this patchset to a manageable size, the pds_vdpa and pds_vfio
drivers have been split out into their own patchsets to be reviewed
separately.

Detail:
-------
AMD/Pensando is making available a new set of devices for supporting vDPA,
VFio, and potentially other features in the Distributed Services Card
(DSC).  These features are implemented through a PF that serves as a Core
device for controlling and configuring its VF devices.  These VF devices
have separate drivers that use the auxiliary_bus to work through the Core
device as the control path.

Currently, the DSC supports standard ethernet operations using the
ionic driver.  This is not replaced by the Core-based devices - these
new devices are in addition to the existing Ethernet device.  Typical DSC
configurations will include both PDS devices and Ionic Eth devices.
However, there is a potential future path for ethernet services to come
through this device as well.

The Core device is a new PCI PF/VF device managed by a new driver
'pds_core'.  The PF device has access to an admin queue for configuring
the services used by the VFs, and sets up auxiliary_bus devices for each
vDPA VF for communicating with the drivers for the vDPA devices.  The VFs
may be for VFio or vDPA, and other services in the future; these VF types
are selected as part of the DSC internal FW configurations, which is out
of the scope of this patchset.

When the vDPA support set is enabled in the core PF through its devlink
param, auxiliary_bus devices are created for each VF that supports the
feature.  The vDPA driver then connects to and uses this auxiliary_device
to do control path configuration through the PF device.  This can then be
used with the vdpa kernel module to provide devices for virtio_vdpa kernel
module for host interfaces, or vhost_vdpa kernel module for interfaces
exported into your favorite VM.

A cheap ASCII diagram of a vDPA instance looks something like this:

                                ,----------.
                                |   vdpa   |
                                '----------'
                                  |     ||
                                 ctl   data
                                  |     ||
                          .----------.  ||
                          | pds_vdpa |  ||
                          '----------'  ||
                               |        ||
                       pds_core.vDPA.1  ||
                               |        ||
                    .---------------.   ||
                    |   pds_core    |   ||
                    '---------------'   ||
                        ||         ||   ||
                      09:00.0      09:00.1
        == PCI ============================================
                        ||            ||
                   .----------.   .----------.
            ,------|    PF    |---|    VF    |-------,
            |      '----------'   '----------'       |
            |                  DSC                   |
            |                                        |
            ------------------------------------------

Changes:
  v11:
 - change strncpy to strscpy
     Reported-by: kernel test robot <lkp@intel.com>
     Link: https://lore.kernel.org/oe-kbuild-all/202304181137.WaZTYyAa-lkp@intel.com/

  v10:
Link: https://lore.kernel.org/netdev/20230418003228.28234-1-shannon.nelson@amd.com/
 - remove CONFIG_DEBUG_FS guard static inline stuff
 - remove unnecessary 0 and null initializations
 - verify in driver load that PDS_CORE_DRV_NAME matches KBUILD_MODNAME
 - remove debugfs irqs_show(), redundant with /proc
 - return -ENOMEM if intr_info = kcalloc() fails
 - move the status code enum into pds_core_if.h as part of API definition
 - fix up one place in pdsc_devcmd_wait() we're using the status codes where we could use the errno
 - remove redundant calls to flush_workqueue()
 - grab config_lock before testing state bits in pdsc_fw_reporter_diagnose()
 - change pdsc_color_match() to return bool
 - remove useless VIF setup loop and just setup vDPA services for now
 - remove pf pointer from struct padev and have clients use pci_physfn()
 - drop use of "vf" in auxdev.c function names, make more generic
 - remove last of client ops struct and simply export the functions
 - drop drivers@pensando.io from MAINTAINERS and add new include dir
 - include dynamic_debug.h in adminq.c to protect dynamic_hex_dump()
 - fixed fw_slot type from u8 to int for handling error returns
 - fixed comment spelling
 - changed void arg in pdsc_adminq_post() to struct pdsc *

  v9:
Link: https://lore.kernel.org/netdev/20230406234143.11318-1-shannon.nelson@amd.com/
 - change pdsc field name id to uid to clarify the unique id used for aux device
 - remove unnecessary pf->state and other checks in aux device creation
 - hardcode fw slotnames for devlink info, don't use strings from FW
 - handle errors from PDS_CORE_CMD_INIT devcmd call
 - tighten up health thread use of config_lock
 - remove pdsc_queue_health_check() layer over queuing health check
 - start pds_core.rst file in first patch, add to it incrementally
 - give more user interaction info in commit messages
 - removed a few more extraneous includes

  v8:
Link: https://lore.kernel.org/netdev/20230330234628.14627-1-shannon.nelson@amd.com/
 - fixed deadlock problem, use devl_health_reporter_destroy() when devlink is locked
 - don't clear client_id until after auxiliary_device_uninit()

  v7:
Link: https://lore.kernel.org/netdev/20230330192313.62018-1-shannon.nelson@amd.com/
 - use explicit devlink locking and devl_* APIs
 - move some of devlink setup logic into probe and remove
 - use debugfs_create_u{type}() for state and queue head and tail
 - add include for linux/vmalloc.h
     Reported-by: kernel test robot <lkp@intel.com>
     Link: https://lore.kernel.org/oe-kbuild-all/202303260420.Tgq0qobF-lkp@intel.com/

  v6:
Link: https://lore.kernel.org/netdev/20230324190243.27722-1-shannon.nelson@amd.com/
 - removed version.h include noticed by kernel test robot's version check
     Reported-by: kernel test robot <lkp@intel.com>
     Link: https://lore.kernel.org/oe-kbuild-all/202303230742.pX3ply0t-lkp@intel.com/
 - fixed up the more egregious checkpatch line length complaints
 - make sure pdsc_auxbus_dev_register() checks padev pointer errcode

  v5:
Link: https://lore.kernel.org/netdev/20230322185626.38758-1-shannon.nelson@amd.com/
 - added devlink health reporter for FW issues
 - removed asic_type, asic_rev, serial_num, fw_version from debugfs as
   they are available through other means
 - trimed OS info in pdsc_identify(), we don't need to send that much info to the FW
 - removed reg/unreg from auxbus client API, they are now in the core when VF
   is started
 - removed need for pdsc definition in client by simplifying the padev to only carry
   struct pci_dev pointers rather than full struct pdsc to the pf and vf
 - removed the unused pdsc argument in pdsc_notify()
 - moved include/linux/pds/pds_core.h to driver/../pds_core/core.h
 - restored a few pds_core_if.h interface values and structs that are shared
   with FW source
 - moved final config_lock unlock to before tear down of timer and workqueue
   to be sure there are no deadlocks while waiting for any stragglers
 - changed use of PAGE_SIZE to local PDS_PAGE_SIZE to keep with FW layout needs
   without regard to kernel PAGE_SIZE configuration
 - removed the redundant *adminqcq argument from pdsc_adminq_post()

  v4:
Link: https://lore.kernel.org/netdev/20230308051310.12544-1-shannon.nelson@amd.com/
 - reworked to attach to both Core PF and vDPA VF PCI devices
 - now creates auxiliary_device as part of each VF PCI probe, removes them on PCI remove
 - auxiliary devices now use simple unique id rather than PCI address for identifier
 - replaced home-grown event publishing with kernel-based notifier service
 - dropped live_migration parameter, not needed when not creating aux device for it
 - replaced devm_* functions with traditional interfaces
 - added MAINTAINERS entry
 - removed lingering traces of set/get_vf attribute adminq commands
 - trimmed some include lists
 - cleaned a kernel test robot complaint about a stray unused variable
        Link: https://lore.kernel.org/oe-kbuild-all/202302181049.yeUQMeWY-lkp@intel.com/

  v3:
Link: https://lore.kernel.org/netdev/20230217225558.19837-1-shannon.nelson@amd.com/
 - changed names from "pensando" to "amd" and updated copyright strings
 - dropped the DEVLINK_PARAM_GENERIC_ID_FW_BANK for future development
 - changed the auxiliary device creation to be triggered by the
   PCI bus event BOUND_DRIVER, and torn down at UNBIND_DRIVER in order
   to properly handle users using the sysfs bind/unbind functions
 - dropped some noisy log messages
 - rebased to current net-next

  RFC to v2:
Link: https://lore.kernel.org/netdev/20221207004443.33779-1-shannon.nelson@amd.com/
 - added separate devlink param patches for DEVLINK_PARAM_GENERIC_ID_ENABLE_MIGRATION
   and DEVLINK_PARAM_GENERIC_ID_FW_BANK, and dropped the driver specific implementations
 - updated descriptions for the new devlink parameters
 - dropped netdev support
 - dropped vDPA patches, will followup later
 - separated fw update and fw bank select into their own patches

  RFC:
Link: https://lore.kernel.org/netdev/20221118225656.48309-1-snelson@pensando.io/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Author: davem330

Documentation/networking/device_drivers/ethernet/amd/pds_core.rst

@@ -0,0 +1,139 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+========================================================
+Linux Driver for the AMD/Pensando(R) DSC adapter family
+========================================================
+
+Copyright(c) 2023 Advanced Micro Devices, Inc
+
+Identifying the Adapter
+=======================
+
+To find if one or more AMD/Pensando PCI Core devices are installed on the
+host, check for the PCI devices::
+
+  # lspci -d 1dd8:100c
+  b5:00.0 Processing accelerators: Pensando Systems Device 100c
+  b6:00.0 Processing accelerators: Pensando Systems Device 100c
+
+If such devices are listed as above, then the pds_core.ko driver should find
+and configure them for use.  There should be log entries in the kernel
+messages such as these::
+
+  $ dmesg | grep pds_core
+  pds_core 0000:b5:00.0: 252.048 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x16 link)
+  pds_core 0000:b5:00.0: FW: 1.60.0-73
+  pds_core 0000:b6:00.0: 252.048 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x16 link)
+  pds_core 0000:b6:00.0: FW: 1.60.0-73
+
+Driver and firmware version information can be gathered with devlink::
+
+  $ devlink dev info pci/0000:b5:00.0
+  pci/0000:b5:00.0:
+    driver pds_core
+    serial_number FLM18420073
+    versions:
+        fixed:
+          asic.id 0x0
+          asic.rev 0x0
+        running:
+          fw 1.51.0-73
+        stored:
+          fw.goldfw 1.15.9-C-22
+          fw.mainfwa 1.60.0-73
+          fw.mainfwb 1.60.0-57
+
+Info versions
+=============
+
+The ``pds_core`` driver reports the following versions
+
+.. list-table:: devlink info versions implemented
+   :widths: 5 5 90
+
+   * - Name
+     - Type
+     - Description
+   * - ``fw``
+     - running
+     - Version of firmware running on the device
+   * - ``fw.goldfw``
+     - stored
+     - Version of firmware stored in the goldfw slot
+   * - ``fw.mainfwa``
+     - stored
+     - Version of firmware stored in the mainfwa slot
+   * - ``fw.mainfwb``
+     - stored
+     - Version of firmware stored in the mainfwb slot
+   * - ``asic.id``
+     - fixed
+     - The ASIC type for this device
+   * - ``asic.rev``
+     - fixed
+     - The revision of the ASIC for this device
+
+Parameters
+==========
+
+The ``pds_core`` driver implements the following generic
+parameters for controlling the functionality to be made available
+as auxiliary_bus devices.
+
+.. list-table:: Generic parameters implemented
+   :widths: 5 5 8 82
+
+   * - Name
+     - Mode
+     - Type
+     - Description
+   * - ``enable_vnet``
+     - runtime
+     - Boolean
+     - Enables vDPA functionality through an auxiliary_bus device
+
+Firmware Management
+===================
+
+The ``flash`` command can update a the DSC firmware.  The downloaded firmware
+will be saved into either of firmware bank 1 or bank 2, whichever is not
+currently in use, and that bank will used for the next boot::
+
+  # devlink dev flash pci/0000:b5:00.0 \
+            file pensando/dsc_fw_1.63.0-22.tar
+
+Health Reporters
+================
+
+The driver supports a devlink health reporter for FW status::
+
+  # devlink health show pci/0000:2b:00.0 reporter fw
+  pci/0000:2b:00.0:
+    reporter fw
+      state healthy error 0 recover 0
+  # devlink health diagnose pci/0000:2b:00.0 reporter fw
+   Status: healthy State: 1 Generation: 0 Recoveries: 0
+
+Enabling the driver
+===================
+
+The driver is enabled via the standard kernel configuration system,
+using the make command::
+
+  make oldconfig/menuconfig/etc.
+
+The driver is located in the menu structure at:
+
+  -> Device Drivers
+    -> Network device support (NETDEVICES [=y])
+      -> Ethernet driver support
+        -> AMD devices
+          -> AMD/Pensando Ethernet PDS_CORE Support
+
+Support
+=======
+
+For general Linux networking support, please use the netdev mailing
+list, which is monitored by AMD/Pensando personnel::
+
+  netdev@vger.kernel.org

Documentation/networking/device_drivers/ethernet/index.rst

@@ -14,6 +14,7 @@ Contents:
    3com/vortex
    amazon/ena
    altera/altera_tse
+   amd/pds_core
    aquantia/atlantic
    chelsio/cxgb
    cirrus/cs89x0

MAINTAINERS

@@ -1041,6 +1041,15 @@ F:	drivers/gpu/drm/amd/include/vi_structs.h
 F:	include/uapi/linux/kfd_ioctl.h
 F:	include/uapi/linux/kfd_sysfs.h
 
+AMD PDS CORE DRIVER
+M:	Shannon Nelson <shannon.nelson@amd.com>
+M:	Brett Creeley <brett.creeley@amd.com>
+L:	netdev@vger.kernel.org
+S:	Supported
+F:	Documentation/networking/device_drivers/ethernet/amd/pds_core.rst
+F:	drivers/net/ethernet/amd/pds_core/
+F:	include/linux/pds/
+
 AMD SPI DRIVER
 M:	Sanjay R Mehta <sanju.mehta@amd.com>
 S:	Maintained

drivers/net/ethernet/amd/Kconfig

@@ -186,4 +186,16 @@ config AMD_XGBE_HAVE_ECC
 	bool
 	default n
 
+config PDS_CORE
+	tristate "AMD/Pensando Data Systems Core Device Support"
+	depends on 64BIT && PCI
+	help
+	  This enables the support for the AMD/Pensando Core device family of
+	  adapters.  More specific information on this driver can be
+	  found in
+	  <file:Documentation/networking/device_drivers/ethernet/amd/pds_core.rst>.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called pds_core.
+
 endif # NET_VENDOR_AMD

drivers/net/ethernet/amd/Makefile

@@ -17,3 +17,4 @@ obj-$(CONFIG_PCNET32) += pcnet32.o
 obj-$(CONFIG_SUN3LANCE) += sun3lance.o
 obj-$(CONFIG_SUNLANCE) += sunlance.o
 obj-$(CONFIG_AMD_XGBE) += xgbe/
+obj-$(CONFIG_PDS_CORE) += pds_core/

drivers/net/ethernet/amd/pds_core/Makefile

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Advanced Micro Devices, Inc.
+
+obj-$(CONFIG_PDS_CORE) := pds_core.o
+
+pds_core-y := main.o \
+	      devlink.o \
+	      auxbus.o \
+	      dev.o \
+	      adminq.o \
+	      core.o \
+	      fw.o
+
+pds_core-$(CONFIG_DEBUG_FS) += debugfs.o