The virtual timebase register (VTB) is a 64-bit register which
increments at the same rate as the timebase register, present on POWER8
and later processors.
The register is able to be read/written by the hypervisor and read by
the supervisor. All other accesses are illegal.
Currently the VTB is just an alias for the timebase (TB) register.
Implement the VTB so that is can be read/written independent of the TB.
Make use of the existing method for accessing timebase facilities where
by the compensation is stored and used to compute the value on reads/is
updated on writes.
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
[ clg: rebased on current ppc tree ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191128134700.16091-2-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Same a POWER9, only the MMIO window changes.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191205184454.10722-6-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The POWER10 PSIHB controller is very similar to the one on POWER9. We
should probably introduce a common PnvPsiXive object.
The ESB page size should be changed to 64k when P10 support is ready.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191205184454.10722-5-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This is an empty shell with the XSCOM bus and cores. The chip controllers
will come later.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191205184454.10722-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This includes in QEMU a new CPU model for the POWER10 processor with
the same capabilities of a POWER9 process. The model will be extended
when support is completed.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191205184454.10722-2-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
PPCVirtualHypervisor is an interface instance. It should never be
dereferenced. Drop the dummy type definition for extra safety, which
is the common practice with QOM interfaces.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157589808041.21182.18121655959115011353.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This only makes sense with an emulated CPU. Don't set the bit in
CPUState::interrupt_request when using KVM to avoid confusions.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157548863423.3650476.16424649423510075159.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The power7_set_irq() and power9_set_irq() functions set this but it is
never used actually. Modern Book3s compatible CPUs are only supported
by the pnv and spapr machines. They have an interrupt controller, XICS
for POWER7/8 and XIVE for POWER9, whose models don't require to track
IRQ input states at the CPU level.
Drop these lines to avoid confusion.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157548862861.3650476.16622818876928044450.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The correct way to do this is to deassert the input pins on the CPU side.
This is the case since a previous change.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157548862298.3650476.1228720391270249433.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When a CPU is reset, QEMU makes sure no interrupt is pending by clearing
CPUPPCstate::pending_interrupts in ppc_cpu_reset(). In the case of a
complete machine emulation, eg. a sPAPR machine, an external interrupt
request could still be pending in KVM though, eg. an IPI. It will be
eventually presented to the guest, which is supposed to acknowledge it at
the interrupt controller. If the interrupt controller is emulated in QEMU,
either XICS or XIVE, ppc_set_irq() won't deassert the external interrupt
pin in KVM since it isn't pending anymore for QEMU. When the vCPU re-enters
the guest, the interrupt request is still pending and the vCPU will try
again to acknowledge it. This causes an infinite loop and eventually hangs
the guest.
The code has been broken since the beginning. The issue wasn't hit before
because accel=kvm,kernel-irqchip=off is an awkward setup that never got
used until recently with the LC92x IBM systems (aka, Boston).
Add a ppc_irq_reset() function to do the necessary cleanup, ie. deassert
the IRQ pins of the CPU in QEMU and most importantly the external interrupt
pin for this vCPU in KVM.
Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157548861740.3650476.16879693165328764758.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
spapr_ovec_diff(ov, old, new) has somewhat complex semantics. ov is set
to those bits which are in new but not old, and it returns as a boolean
whether or not there are any bits in old but not new.
It turns out that both callers only care about the second, not the first.
This is basically equivalent to a bitmap subset operation, which is easier
to understand and implement. So replace spapr_ovec_diff() with
spapr_ovec_subset().
Cc: Mike Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
spapr_h_cas_compose_response() handles the last piece of the PAPR feature
negotiation process invoked via the ibm,client-architecture-support OF
call. Its only caller is h_client_architecture_support() which handles
most of the rest of that process.
I believe it was placed in a separate file originally to handle some
fiddly dependencies between functions, but mostly it's just confusing
to have the CAS process split into two pieces like this. Now that
compose response is simplified (by just generating the whole device
tree anew), it's cleaner to just fold it into
h_client_architecture_support().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Previously, spapr_build_fdt() constructed the device tree in a fixed
buffer of size FDT_MAX_SIZE. This is a bit inflexible, but more
importantly it's awkward for the case where we use it during CAS. In
that case the guest firmware supplies a buffer and we have to
awkwardly check that what we generated fits into it afterwards, after
doing a lot of size checks during spapr_build_fdt().
Simplify this by having spapr_build_fdt() take a 'space' parameter.
For the CAS case, we pass in the buffer size provided by SLOF, for the
machine init case, we continue to pass FDT_MAX_SIZE.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
PAPR allows the interrupt controller used on a POWER9 machine (XICS or
XIVE) to be selected by the guest operating system, by using the
ibm,client-architecture-support (CAS) feature negotiation call.
Currently, if the guest selects an interrupt controller different from the
one selected at initial boot, this causes the system to be reset with the
new model and the boot starts again. This means we run through the SLOF
boot process twice, as well as any other bootloader (e.g. grub) in use
before the OS calls CAS. This can be confusing and/or inconvenient for
users.
Thanks to two fairly recent changes, we no longer need this reboot. 1) we
now completely regenerate the device tree when CAS is called (meaning we
don't need special case updates for all the device tree changes caused by
the interrupt controller mode change), 2) we now have explicit code paths
to activate and deactivate the different interrupt controllers, rather than
just implicitly calling those at machine reset time.
We can therefore eliminate the reboot for changing irq mode, simply by
putting a call to spapr_irq_update_active_intc() before we call
spapr_h_cas_compose_response() (which gives the updated device tree to
the guest firmware and OS).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Make kvmppc_hint_smt_possible hint append helper well formed:
rename errp to errp_in, as it is IN-parameter here (which is unusual
for errp), rename function to be kvmppc_error_append_*_hint.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20191127191434.20945-1-vsementsov@virtuozzo.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This is useful to dump the saved contexts of the vCPUs : configuration
of the base END index of the vCPU and the Interrupt Pending Buffer
register, which is updated when an interrupt can not be presented.
When dumping the NVT table, we skip empty indirect pages which are not
necessarily allocated.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-21-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When doing CAM line compares, fetch the block id from the interrupt
controller which can have set the PC_TCTXT_CHIPID field.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-20-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When PC_TCTXT_CHIPID_OVERRIDE is configured, the PC_TCTXT_CHIPID field
overrides the hardwired chip ID in the Powerbus operations and for CAM
compares. This is typically used in the one block-per-chip configuration
to associate a unique block id number to each IC of the system.
Simplify the model with a pnv_xive_block_id() helper and remove
'tctx_chipid' which becomes useless.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-19-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When a vCPU is dispatched on a HW thread, its context is pushed in the
thread registers and it is activated by setting the VO bit in the CAM
line word2. The HW grabs the associated NVT, pulls the IPB bits and
merges them with the IPB of the new context. If interrupts were missed
while the vCPU was not dispatched, these are synthesized in this
sequence.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-18-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We will use it to resend missed interrupts when a vCPU context is
pushed on a HW thread.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-17-clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
It is now unused.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-16-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
On the P9 Processor, the thread interrupt context registers of a CPU
can be accessed "directly" when by load/store from the CPU or
"indirectly" by the IC through an indirect TIMA page. This requires to
configure first the PC_TCTXT_INDIRx registers.
Today, we rely on the get_tctx() handler to deduce from the CPU PIR
the chip from which the TIMA access is being done. By handling the
TIMA memory ops under the interrupt controller model of each machine,
we can uniformize the TIMA direct and indirect ops under PowerNV. We
can also check that the CPUs have been enabled in the XIVE controller.
This prepares ground for the future versions of XIVE.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-15-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The TIMA region gives access to the thread interrupt context registers
of a CPU. It is mapped at the same address on all chips and can be
accessed by any CPU of the system. To identify the chip from which the
access is being done, the PowerBUS uses a 'chip' field in the
load/store messages. QEMU does not model these messages, instead, we
extract the chip id from the CPU PIR and do a lookup at the machine
level to fetch the targeted interrupt controller.
Introduce pnv_get_chip() and pnv_xive_tm_get_xive() helpers to clarify
this process in pnv_xive_get_tctx(). The latter will be removed in the
subsequent patches but the same principle will be kept.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-14-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The XIVE KVM devices now has an attribute to configure the number of
interrupt servers. This allows to greatly optimize the usage of the VP
space in the XIVE HW, and thus to start a lot more VMs.
Only set this attribute if available in order to support older POWER9
KVM.
The XIVE KVM device now reports the exhaustion of VPs upon the
connection of the first VCPU. Check that in order to have a chance
to provide a hint to the user.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157478679392.67101.7843580591407950866.stgit@bahia.tlslab.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The XICS-on-XIVE KVM devices now has an attribute to configure the number
of interrupt servers. This allows to greatly optimize the usage of the VP
space in the XIVE HW, and thus to start a lot more VMs.
Only set this attribute if available in order to support older POWER9 KVM
and pre-POWER9 XICS KVM devices.
The XICS-on-XIVE KVM device now reports the exhaustion of VPs upon the
connection of the first VCPU. Check that in order to have a chance to
provide a hint to the user.
`
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157478678846.67101.9660531022460517710.stgit@bahia.tlslab.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The XIVE and XICS-on-XIVE KVM devices on POWER9 hosts can greatly reduce
their consumption of some scarce HW resources, namely Virtual Presenter
identifiers, if they know the maximum number of vCPUs that may run in the
VM.
Prepare ground for this by passing the value down to xics_kvm_connect()
and kvmppc_xive_connect(). This is purely mechanical, no functional
change.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157478678301.67101.2717368060417156338.stgit@bahia.tlslab.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Update to mainline commit be2eca94d144 ("Merge tag 'for-linus-5.5-1'`
of git://github.com/cminyard/linux-ipmi")
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157478677756.67101.11558821804418331832.stgit@bahia.tlslab.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The TIMA operations are performed on behalf of the XIVE IVPE sub-engine
(Presenter) on the thread interrupt context registers. The current
operations supported by the model are simple and do not require access
to the controller but more complex operations will need access to the
controller NVT table and to its configuration.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-13-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Now that the machines have handlers implementing the XiveFabric and
XivePresenter interfaces, remove xive_presenter_match() and make use
of the 'match_nvt' handler of the machine.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-12-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The CAM line matching sequence in the pseries machine does not change
much apart from the use of the new QOM interfaces. There is an extra
indirection because of the sPAPR IRQ backend of the machine. Only the
XIVE backend implements the new 'match_nvt' handler.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-11-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The CAM line matching on the PowerNV machine now scans all chips of
the system and all CPUs of a chip to find a dispatched NVT in the
thread contexts.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-10-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The XiveFabric QOM interface acts as the PowerBUS interface between
the interrupt controller and the system and should be implemented by
the QEMU machine. On HW, the XIVE sub-engine is responsible for the
communication with the other chip is the Common Queue (CQ) bridge
unit.
This interface offers a 'match_nvt' handler to perform the CAM line
matching when looking for a XIVE Presenter with a dispatched NVT.
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-9-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When the TIMA of a CPU needs to be accessed from the indirect page,
the thread id of the target CPU is first stored in the PC_TCTXT_INDIR0
register. This thread id is relative to the chip and not to the system.
Introduce a helper routine to look for a CPU of a given PIR and fix
pnv_xive_get_indirect_tctx() to scan only the threads of the local
chip and not the whole machine.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-8-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
and use this helper to exclude CPUs which are not enabled in the XIVE
controller.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-7-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
CPU_FOREACH() loops on all the CPUs of the machine which is incorrect.
Each XIVE Presenter should scan only the HW threads of the chip it
belongs to.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-5-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Allocating a big void * array to store multiple objects isn't a
recommended practice for various reasons:
- no compile time type checking
- potential dangling pointers if a reference on an individual is
taken and the array is freed later on
- duplicate boiler plate everywhere the array is browsed through
Allocate an array of pointers and populate it instead.
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-4-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Each XIVE Router model, sPAPR and PowerNV, now implements the 'match_nvt'
handler of the XivePresenter QOM interface. This is simply moving code
and taking into account the new API.
To be noted that the xive_router_get_tctx() helper is not used anymore
when doing CAM matching and will be removed later on after other changes.
The XIVE presenter model is still too simple for the PowerNV machine
and the CAM matching algo is not correct on multichip system. Subsequent
patches will introduce more changes to scan all chips of the system.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When the XIVE IVRE sub-engine (XiveRouter) looks for a Notification
Virtual Target (NVT) to notify, it broadcasts a message on the
PowerBUS to find an XIVE IVPE sub-engine (Presenter) with the NVT
dispatched on one of its HW threads, and then forwards the
notification if any response was received.
The current XIVE presenter model is sufficient for the pseries machine
because it has a single interrupt controller device, but the PowerNV
machine can have multiple chips each having its own interrupt
controller. In this case, the XIVE presenter model is too simple and
the CAM line matching should scan all chips of the system.
To start fixing this issue, we first extend the XIVE Router model with
a new XivePresenter QOM interface representing the XIVE IVPE
sub-engine. This interface exposes a 'match_nvt' handler which the
sPAPR and PowerNV XIVE Router models will need to implement to perform
the CAM line matching.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191125065820.927-2-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The BMC of the OpenPOWER systems monitors the machine state using
sensors, controls the power and controls the access to the PNOR flash
device containing the firmware image required to boot the host.
QEMU models the power cycle process, access to the sensors and access
to the PNOR device. But, for these features to be available, the QEMU
PowerNV machine needs two extras devices on the command line, an IPMI
BT device for communication and a BMC backend device:
-device ipmi-bmc-sim,id=bmc0 -device isa-ipmi-bt,bmc=bmc0,irq=10
The BMC properties are then defined accordingly in the device tree and
OPAL self adapts. If a BMC device and an IPMI BT device are not
available, OPAL does not try to communicate with the BMC in any
manner. This is not how real systems behave.
To be closer to the default behavior, create an IPMI BMC simulator
device and an IPMI BT device at machine initialization time. We loose
the ability to define an external BMC device but there are benefits:
- a better match with real systems,
- a better test coverage of the OPAL code,
- system powerdown and reset commands that work,
- a QEMU device tree compliant with the specifications (*).
(*) Still needs a MBOX device.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191121162340.11049-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This activates HIOMAP support on the QEMU PowerNV machine. The PnvPnor
model is used to access the flash contents. The model simply maps the
contents at a fix offset and enables or disables the mapping.
HIOMAP Protocol description :
https://github.com/openbmc/hiomapd/blob/master/Documentation/protocol.md
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191028070027.22752-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
A context should be 'valid' when pulled from the thread interrupt
context registers.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-8-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The OS CAM line has a special encoding exploited by the HW. Provide
helper routines to hide the details to the TIMA command handlers. This
also clarifies the endianness of different variables : 'qw1w2' is
big-endian and 'cam' is native.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-7-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When dumping the END and NVT tables, the error logging is too noisy.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-6-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When using the XIVE KVM device, the trigger page is directly accessible
in QEMU. Unlike with XICS, no need to ask KVM to fire the interrupt. A
simple store on the trigger page does the job.
Just call xive_esb_trigger().
This may improve performance of emulated devices that go through
qemu_set_irq(), eg. virtio devices created with ioeventfd=off or
configured by the guest to use LSI interrupts, which aren't really
recommended setups.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157408992731.494439.3405812941731584740.stgit@bahia.lan>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
pnv_xive_vst_size() tries to compute the size of a VSD table from the
information given by FW. The number of entries of the table are
deduced from the result and the MMIO regions of the ESBs and the END
ESBs are then resized accordingly with the computed value. This
reduces the number of elements that can be addressed by the ESB pages.
The maximum number of elements of a direct table can contain is simply:
Table size / sizeof(XIVE structure)
An indirect table is a one page array of VSDs pointing to subpages
containing XIVE virtual structures and the maximum number of elements
an indirect table can contain :
(PAGE_SIZE / sizeof(vsd)) * (PAGE_SIZE / sizeof(XIVE structure))
which gives us 16M for XiveENDs, 8M for XiveNVTs. That's more than the
associated VC and PC BARS can address.
The result returned by pnv_xive_vst_size() for indirect tables is
incorrect and can not be used to reduce the size of the MMIO region of
a XIVE resource using an indirect table, such as ENDs in skiboot.
Remove pnv_xive_vst_size() and use a simpler form for direct tables
only. Keep the resizing of the MMIO region for direct tables only as
this is still useful for the ESB MMIO window.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-4-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Each vCPU in the system is identified with an NVT identifier which is
pushed in the OS CAM line (QW1W2) of the HW thread interrupt context
register when the vCPU is dispatched on a HW thread. This identifier
is used by the presenter subengine to find a matching target to notify
of an event. It is also used to fetch the associate NVT structure
which may contain pending interrupts that need a resend.
Add a couple of helpers for the NVT ids. The NVT space is 19 bits
wide, giving a maximum of 512K per chip.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When an interrupt can not be presented to a vCPU, because it is not
running on any of the HW treads, the XIVE presenter updates the
Interrupt Pending Buffer register of the associated XIVE NVT
structure. This is only done if backlog is activated in the END but
this is generally the case.
The current code assumes that the fields of the NVT structure is
architected with the same layout of the thread interrupt context
registers. Fix this assumption and define an offset for the IPB
register backup value in the NVT.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-2-clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
