Documentation for IBM FSI model.
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
---
v11:
- Removed Cedri's signoff.
---
docs/specs/fsi.rst | 138 +++++++++++++++++++++++++++++++++++++++++++
docs/specs/index.rst | 1 +
2 files changed, 139 insertions(+)
create mode 100644 docs/specs/fsi.rst
diff --git a/docs/specs/fsi.rst b/docs/specs/fsi.rst
new file mode 100644
index 0000000000..05a6b6347a
--- /dev/null
+++ b/docs/specs/fsi.rst
@@ -0,0 +1,138 @@
+======================================
+IBM's Flexible Service Interface (FSI)
+======================================
+
+The QEMU FSI emulation implements hardware interfaces between ASPEED SOC, FSI
+master/slave and the end engine.
+
+FSI is a point-to-point two wire interface which is capable of supporting
+distances of up to 4 meters. FSI interfaces have been used successfully for
+many years in IBM servers to attach IBM Flexible Support Processors(FSP) to
+CPUs and IBM ASICs.
+
+FSI allows a service processor access to the internal buses of a host POWER
+processor to perform configuration or debugging. FSI has long existed in POWER
+processes and so comes with some baggage, including how it has been integrated
+into the ASPEED SoC.
+
+Working backwards from the POWER processor, the fundamental pieces of interest
+for the implementation are: (see the `FSI specification`_ for more details)
+
+1. The Common FRU Access Macro (CFAM), an address space containing various
+ "engines" that drive accesses on buses internal and external to the POWER
+ chip. Examples include the SBEFIFO and I2C masters. The engines hang off of
+ an internal Local Bus (LBUS) which is described by the CFAM configuration
+ block.
+
+2. The FSI slave: The slave is the terminal point of the FSI bus for FSI
+ symbols addressed to it. Slaves can be cascaded off of one another. The
+ slave's configuration registers appear in address space of the CFAM to
+ which it is attached.
+
+3. The FSI master: A controller in the platform service processor (e.g. BMC)
+ driving CFAM engine accesses into the POWER chip. At the hardware level
+ FSI is a bit-based protocol supporting synchronous and DMA-driven accesses
+ of engines in a CFAM.
+
+4. The On-Chip Peripheral Bus (OPB): A low-speed bus typically found in POWER
+ processors. This now makes an appearance in the ASPEED SoC due to tight
+ integration of the FSI master IP with the OPB, mainly the existence of an
+ MMIO-mapping of the CFAM address straight onto a sub-region of the OPB
+ address space.
+
+5. An APB-to-OPB bridge enabling access to the OPB from the ARM core in the
+ AST2600. Hardware limitations prevent the OPB from being directly mapped
+ into APB, so all accesses are indirect through the bridge.
+
+The LBUS is modelled to maintain the qdev bus hierarchy and to take advantages
+of the object model to automatically generate the CFAM configuration block.
+The configuration block presents engines in the order they are attached to the
+CFAM's LBUS. Engine implementations should subclass the LBusDevice and set the
+'config' member of LBusDeviceClass to match the engine's type.
+
+CFAM designs offer a lot of flexibility, for instance it is possible for a
+CFAM to be simultaneously driven from multiple FSI links. The modeling is not
+so complete; it's assumed that each CFAM is attached to a single FSI slave (as
+a consequence the CFAM subclasses the FSI slave).
+
+As for FSI, its symbols and wire-protocol are not modelled at all. This is not
+necessary to get FSI off the ground thanks to the mapping of the CFAM address
+space onto the OPB address space - the models follow this directly and map the
+CFAM memory region into the OPB's memory region.
+
+QEMU files related to FSI interface:
+ - ``hw/fsi/aspeed-apb2opb.c``
+ - ``include/hw/fsi/aspeed-apb2opb.h``
+ - ``hw/fsi/opb.c``
+ - ``include/hw/fsi/opb.h``
+ - ``hw/fsi/fsi.c``
+ - ``include/hw/fsi/fsi.h``
+ - ``hw/fsi/fsi-master.c``
+ - ``include/hw/fsi/fsi-master.h``
+ - ``hw/fsi/fsi-slave.c``
+ - ``include/hw/fsi/fsi-slave.h``
+ - ``hw/fsi/cfam.c``
+ - ``include/hw/fsi/cfam.h``
+ - ``hw/fsi/engine-scratchpad.c``
+ - ``include/hw/fsi/engine-scratchpad.h``
+ - ``include/hw/fsi/lbus.h``
+
+The following commands start the rainier machine with built-in FSI model.
+There are no model specific arguments.
+
+.. code-block:: console
+
+ qemu-system-arm -M rainier-bmc -nographic \
+ -kernel fitImage-linux.bin \
+ -dtb aspeed-bmc-ibm-rainier.dtb \
+ -initrd obmc-phosphor-initramfs.rootfs.cpio.xz \
+ -drive file=obmc-phosphor-image.rootfs.wic.qcow2,if=sd,index=2 \
+ -append "rootwait console=ttyS4,115200n8 root=PARTLABEL=rofs-a"
+
+The implementation appears as following in the qemu device tree:
+
+.. code-block:: console
+
+ (qemu) info qtree
+ bus: main-system-bus
+ type System
+ ...
+ dev: aspeed.apb2opb, id ""
+ gpio-out "sysbus-irq" 1
+ mmio 000000001e79b000/0000000000001000
+ bus: opb.1
+ type opb
+ dev: fsi.master, id ""
+ bus: fsi.bus.1
+ type fsi.bus
+ dev: cfam.config, id ""
+ dev: cfam, id ""
+ bus: lbus.1
+ type lbus
+ dev: scratchpad, id ""
+ address = 0 (0x0)
+ bus: opb.0
+ type opb
+ dev: fsi.master, id ""
+ bus: fsi.bus.0
+ type fsi.bus
+ dev: cfam.config, id ""
+ dev: cfam, id ""
+ bus: lbus.0
+ type lbus
+ dev: scratchpad, id ""
+ address = 0 (0x0)
+
+pdbg is a simple application to allow debugging of the host POWER processors
+from the BMC. (see the `pdbg source repository`_ for more details)
+
+.. code-block:: console
+
+ root@p10bmc:~# pdbg -a getcfam 0x0
+ p0: 0x0 = 0xc0022d15
+
+.. _FSI specification:
+ https://openpowerfoundation.org/specifications/fsi/
+
+.. _pdbg source repository:
+ https://github.com/open-power/pdbg
diff --git a/docs/specs/index.rst b/docs/specs/index.rst
index b3f482b0aa..1484e3e760 100644
--- a/docs/specs/index.rst
+++ b/docs/specs/index.rst
@@ -24,6 +24,7 @@ guest hardware that is specific to QEMU.
acpi_erst
sev-guest-firmware
fw_cfg
+ fsi
vmw_pvscsi-spec
edu
ivshmem-spec
--
2.39.2On 1/26/24 04:40, Ninad Palsule wrote: > Documentation for IBM FSI model. > > Signed-off-by: Ninad Palsule <ninad@linux.ibm.com> > --- > v11: > - Removed Cedri's signoff. > --- > docs/specs/fsi.rst | 138 +++++++++++++++++++++++++++++++++++++++++++ > docs/specs/index.rst | 1 + > 2 files changed, 139 insertions(+) > create mode 100644 docs/specs/fsi.rst > > diff --git a/docs/specs/fsi.rst b/docs/specs/fsi.rst > new file mode 100644 > index 0000000000..05a6b6347a > --- /dev/null > +++ b/docs/specs/fsi.rst > @@ -0,0 +1,138 @@ > +====================================== > +IBM's Flexible Service Interface (FSI) > +====================================== > + > +The QEMU FSI emulation implements hardware interfaces between ASPEED SOC, FSI > +master/slave and the end engine. > + > +FSI is a point-to-point two wire interface which is capable of supporting > +distances of up to 4 meters. FSI interfaces have been used successfully for > +many years in IBM servers to attach IBM Flexible Support Processors(FSP) to > +CPUs and IBM ASICs. > + > +FSI allows a service processor access to the internal buses of a host POWER > +processor to perform configuration or debugging. FSI has long existed in POWER > +processes and so comes with some baggage, including how it has been integrated > +into the ASPEED SoC. > + > +Working backwards from the POWER processor, the fundamental pieces of interest > +for the implementation are: (see the `FSI specification`_ for more details) > + > +1. The Common FRU Access Macro (CFAM), an address space containing various > + "engines" that drive accesses on buses internal and external to the POWER > + chip. Examples include the SBEFIFO and I2C masters. The engines hang off of > + an internal Local Bus (LBUS) which is described by the CFAM configuration > + block. > + > +2. The FSI slave: The slave is the terminal point of the FSI bus for FSI > + symbols addressed to it. Slaves can be cascaded off of one another. The > + slave's configuration registers appear in address space of the CFAM to > + which it is attached. > + > +3. The FSI master: A controller in the platform service processor (e.g. BMC) > + driving CFAM engine accesses into the POWER chip. At the hardware level > + FSI is a bit-based protocol supporting synchronous and DMA-driven accesses > + of engines in a CFAM. > + > +4. The On-Chip Peripheral Bus (OPB): A low-speed bus typically found in POWER > + processors. This now makes an appearance in the ASPEED SoC due to tight > + integration of the FSI master IP with the OPB, mainly the existence of an > + MMIO-mapping of the CFAM address straight onto a sub-region of the OPB > + address space. > + > +5. An APB-to-OPB bridge enabling access to the OPB from the ARM core in the > + AST2600. Hardware limitations prevent the OPB from being directly mapped > + into APB, so all accesses are indirect through the bridge. > + > +The LBUS is modelled to maintain the qdev bus hierarchy and to take advantages > +of the object model to automatically generate the CFAM configuration block. > +The configuration block presents engines in the order they are attached to the > +CFAM's LBUS. Engine implementations should subclass the LBusDevice and set the > +'config' member of LBusDeviceClass to match the engine's type. > + > +CFAM designs offer a lot of flexibility, for instance it is possible for a > +CFAM to be simultaneously driven from multiple FSI links. The modeling is not > +so complete; it's assumed that each CFAM is attached to a single FSI slave (as > +a consequence the CFAM subclasses the FSI slave). > + > +As for FSI, its symbols and wire-protocol are not modelled at all. This is not > +necessary to get FSI off the ground thanks to the mapping of the CFAM address > +space onto the OPB address space - the models follow this directly and map the > +CFAM memory region into the OPB's memory region. > + > +QEMU files related to FSI interface: > + - ``hw/fsi/aspeed-apb2opb.c`` > + - ``include/hw/fsi/aspeed-apb2opb.h`` > + - ``hw/fsi/opb.c`` > + - ``include/hw/fsi/opb.h`` > + - ``hw/fsi/fsi.c`` > + - ``include/hw/fsi/fsi.h`` > + - ``hw/fsi/fsi-master.c`` > + - ``include/hw/fsi/fsi-master.h`` > + - ``hw/fsi/fsi-slave.c`` > + - ``include/hw/fsi/fsi-slave.h`` > + - ``hw/fsi/cfam.c`` > + - ``include/hw/fsi/cfam.h`` > + - ``hw/fsi/engine-scratchpad.c`` > + - ``include/hw/fsi/engine-scratchpad.h`` > + - ``include/hw/fsi/lbus.h`` Please remove the file list above. > +The following commands start the rainier machine with built-in FSI model. rainier -> ``rainier-bmc`` > +There are no model specific arguments. I would also add a reference to the docs/system/arm/aspeed.rst page. > + > +.. code-block:: console > + > + qemu-system-arm -M rainier-bmc -nographic \ > + -kernel fitImage-linux.bin \ > + -dtb aspeed-bmc-ibm-rainier.dtb \ > + -initrd obmc-phosphor-initramfs.rootfs.cpio.xz \ > + -drive file=obmc-phosphor-image.rootfs.wic.qcow2,if=sd,index=2 \ > + -append "rootwait console=ttyS4,115200n8 root=PARTLABEL=rofs-a" > + > +The implementation appears as following in the qemu device tree: > + > +.. code-block:: console > + > + (qemu) info qtree > + bus: main-system-bus > + type System > + ... > + dev: aspeed.apb2opb, id "" > + gpio-out "sysbus-irq" 1 > + mmio 000000001e79b000/0000000000001000 > + bus: opb.1 > + type opb > + dev: fsi.master, id "" > + bus: fsi.bus.1 > + type fsi.bus > + dev: cfam.config, id "" > + dev: cfam, id "" > + bus: lbus.1 > + type lbus > + dev: scratchpad, id "" > + address = 0 (0x0) > + bus: opb.0 > + type opb > + dev: fsi.master, id "" > + bus: fsi.bus.0 > + type fsi.bus > + dev: cfam.config, id "" > + dev: cfam, id "" > + bus: lbus.0 > + type lbus > + dev: scratchpad, id "" > + address = 0 (0x0) > + > +pdbg is a simple application to allow debugging of the host POWER processors > +from the BMC. (see the `pdbg source repository`_ for more details) > + > +.. code-block:: console > + > + root@p10bmc:~# pdbg -a getcfam 0x0 > + p0: 0x0 = 0xc0022d15 > + > +.. _FSI specification: > + https://openpowerfoundation.org/specifications/fsi/ > + > +.. _pdbg source repository: > + https://github.com/open-power/pdbg > diff --git a/docs/specs/index.rst b/docs/specs/index.rst > index b3f482b0aa..1484e3e760 100644 > --- a/docs/specs/index.rst > +++ b/docs/specs/index.rst > @@ -24,6 +24,7 @@ guest hardware that is specific to QEMU. > acpi_erst > sev-guest-firmware > fw_cfg > + fsi > vmw_pvscsi-spec > edu > ivshmem-spec
Hello Cedric, >> +QEMU files related to FSI interface: >> + - ``hw/fsi/aspeed-apb2opb.c`` >> + - ``include/hw/fsi/aspeed-apb2opb.h`` >> + - ``hw/fsi/opb.c`` >> + - ``include/hw/fsi/opb.h`` >> + - ``hw/fsi/fsi.c`` >> + - ``include/hw/fsi/fsi.h`` >> + - ``hw/fsi/fsi-master.c`` >> + - ``include/hw/fsi/fsi-master.h`` >> + - ``hw/fsi/fsi-slave.c`` >> + - ``include/hw/fsi/fsi-slave.h`` >> + - ``hw/fsi/cfam.c`` >> + - ``include/hw/fsi/cfam.h`` >> + - ``hw/fsi/engine-scratchpad.c`` >> + - ``include/hw/fsi/engine-scratchpad.h`` >> + - ``include/hw/fsi/lbus.h`` > > Please remove the file list above. Removed files and listed only directories so that people can easily find the code. > >> +The following commands start the rainier machine with built-in FSI >> model. > > rainier -> ``rainier-bmc`` Replaced it. > >> +There are no model specific arguments. > I would also add a reference to the docs/system/arm/aspeed.rst page. Added the reference. Thanks for the review. Regards, Ninad
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