Unmasking of a pending interrupt did not lead to immediate IRQ handler
execution in all cases.
This commit also addresses some style concerns risen during the issue
discussion.
- Replace multi-boolean IRQ state by state enum
- EOI and ACK should be same in DDE context
- Unify x86 and ARM irqchip.c
- Remove Pending_irq type
- Remove dde_irq_set_wake()
Fixes#5164
The use of the Linux-internal SLUB allocator is supported by lx_emul and
drivers may now decide between the Linux implementation or our emulation
of kmem_cache. Drivers for pc and virt already use SLUB, while other
drivers still use the emulation and may be adapted step-by-step incl.
the testing on the devices.
Fixes#5236
lx_emul_trace_msg() uses Genode::trace() as message function for
lightweight trace points, but also supports Linux format-string
attributes by using vsnprintf().
Replace the USB session API by one that provides a devices ROM only,
which contains information about all USB devices available for this client,
as well as methods to acquire and release a single device.
The acquisition of an USB device returns the capability to a device session
that includes a packet stream buffer to communicate control transfers
in between the client and the USB host controller driver. Moreover,
additional methods to acquire and release an USB interface can be used.
The acquisition of an USB interface returns the capability to an interface
session that includes a packet stream buffer to communicate either
bulk, interrupt, or isochronous transfers in between the client and the
USB host controller driver.
This commit implements the API changes in behalf of the Genode C API's
USB server and client side. Addtionally, it provides Usb::Device,
Usb::Interface, and Usb::Endpoint utilities that can be used by native
C++ clients to use the new API and hide the sophisticated packet stream API.
The adaptations necessary target the following areas:
* lx_emul layer for USB host and client side
* Linux USB host controller driver port for PC
* Linux USB client ports: usb_hid_drv and usb_net_drv, additionally
reduce the Linux tasks used inside these drivers
* Native usb_block_drv
* black_hole component
* Port of libusb, including smartcard and usb_webcam driver depending on it
* Port of Qemu XHCI model library, including vbox5 & vbox6 depending on it
* Adapt all run-scripts and drivers_interactive recipes to work
with the new policy rules of the USB host controller driver
Fixgenodelabs/genode#5021
This commit enables generic Linux multi-touch support as well as support
for the Wacom Intuos/Graphire tablets as found in the previous version
of the USB HID driver. Events are not properly propagated through
Genode's Event C-API, yet, which will be a follow up.
Issue #5105
Add the possibility to execute a module-init call by name using
'lx_emul_init_call', this is used, for example, by lxip to configure and
re-configure the IP address through 'ip_auto_config'.
issue #5104
The classes Genode::Mmio, Genode::Register_set, Genode::Attached_mmio, and
Platform::Device::Mmio now receive a template parameter 'size_t SIZE'. In each
type that derives from one of these classes, it is now statically checked that
the range of each Genode::Register::Register- and
Genode::Register_set::Register_array-deriving sub-type is within [0..SIZE).
That said, SIZE is the minimum size of the memory region provided to the above
mentioned Mmio classes in order to avoid page faults or memory corruption when
accessing the registers and register arrays declared inside.
Note, that the range end of a register array is not the end of the last item
but the end of integer access that is used for accessing the last bit in the
last item.
The constructors of Genode::Mmio, Genode::Attached_mmio, and
Platform::Device::Mmio now receive an argument 'Byte_range_ptr range' that is
expected to be the range of the backing memory region. In each type that derives
from on of these classes, it is now dynamically checked that 'range.num_bytes
>= SIZE', thereby implementing the above mention protection against page faults
and memory corruption.
The rest of the commit adapts the code throughout the Genode Labs repositories
regarding the changes. Note that for that code inside Core, the commits mostly
uses a simplified approach by constructing MMIO objects with range
[base..base+SIZE) and not with a mapping- or specification-related range size.
This should be fixed in the future.
Furthermore, there are types that derive from an MMIO class but don't declare
any registers or register arrays (especially with Platform::Device::Mmio). In
this case SIZE is set to 0. This way, the parameters must be actively corrected
by someone who later wants to add registers or register arrays, plus the places
can be easily found by grep'ing for Mmio<0>.
Fix#4081
Functions registered with 'module_init' (i.e., '__define_initcalls'),
'OF_DECLARE', and 'DECLARE_PCI_FIXUP_CLASS_FINAL' used to be static
constructors and had be explicitly registered using
'exec_static_constructors' before executing any Linux code.
With this commit we remove the constructor attributes from these
functions and create a global function pointer in the form of
__initptr_<name>_<id>_<counter>_<line number of macro>
'import-lx_emul_common.inc' will collect these '__initptr' symbols after
the compile step and generate a 'lx_emul_register_initcalls' function
that executes the functions pointed to. This step is now automatically
performed in 'lx_emul_start_kernel'. This way a call to
'exec_static_constructors' can be omitted in case there are no other
constructors in place.
issue #5096
The former implementation relied on input drvdata always pointing to
struct hid_device, which is not true for Wacom touch devices (at least).
Now, we implement the input handler for devices providing LEDs
(evbit[EV_LED] set) only and use input_inject_event() to set the LED
states.
The management of Linux page structs is now tied to the life time of DMA
buffers. Thus, page structs are created when a buffer is allocated and
deallocated only when a buffer is freed - not on lx_emul_mem_free()
because DMA buffers are cached. Page struct refcounting was entirely
reworked in lx_emul/shadow/mm/page_alloc.c.
Fixes#4809
The devio API in the Linux kernel promised to be a stable layer for our
USB host controller drivers, but the additional bookkeeping and dynamic
allocations increase CPU overhead in a way that we do not accept further.
Therefore, we go a step back and process DMA transactions directly in and
out of the packet stream from the clients.
Fixgenodelabs/genode#5071
This commit adds support to initialize the timekeeping for
the Linux subsystem with the value from the RTC.
Only the seconds part of timespec64 is supported.
Issue genodelabs/genode#4957
This commit extends the Lx_kit initialization function by passing in
a signal handler that is used to perform the normally occurring
scheduler execution and is a follow-up change for the decoupling
scheduler execution commit.
Instead of burying the signal handler in the 'Lx_kit::Scheduler'
object it is provided by the main object where the driver is free
to perform any additional step before or after executing the scheduler.
Issue #4927Fixes#4952
Decoupling the scheduler execution can lead to missed interrupts
because the current implementation only handles one pending
interrupt and requires immediate processing.
This commit introduces a helper object that is used to capture
any occuring interrupts that are then handled consecutively.
Issue #4927.
Prior to this commit, whenever an external event occurred, for example
timer or interrupt, the corresponding I/O signal handler was triggered.
This handler unblocked the task waiting for the event and initiated the
immediate execution of all unblocked tasks. Since these tasks may hit
serialization points, e.g. synchronously waiting for packet stream
operations, that require handling of other I/O signals this leads to
nested execution. This, however, is not supported and mixes application
and I/O level signal handling.
The flagging of the scheduling intent is now decoupled from its
execution by using an application level signal handler that is run in
the context of the components main entrypoint. The I/O signal handler
now triggers the scheduling execution by sending a local signal to
the EP.
Since it might be necessary to execute a pending schedule from the EP
directly the scheduler is extended with the 'execute' member function
that performs the check that the scheduler is called from within the
EP and triggers the execution afterwards.
Issue #4927.
With these options enabled comparative testing between pc_linux drivers
and bzImages becomes much easier on EFI-only machines. The impact on the
actual Genode drivers is minimal.
This commit introduces support for building the WLAN driver for ARM
platforms. It makes the WPA supplicant and its support libraries
available for all platforms. It also seperates the PCI parts to
accommodate platforms where other bus protocols are used.
Issue #4813
Implement udelay for all architectures within common lx_emul code,
remove driver-specific version.
Always do busy looping in udelay and use cpu_relax()
like the original Linux code. Thereby, we profit from architecture specific
instructions (cpu cool down), and jiffies are updated if irqs are on.
Ref genodelabs/genode#4778
There are rare use-cases where cpu_relax is used inside a busy loop
(i2c bus functions), which only will break when the jiffies counter
reaches a specific value.
Because of the cooperative scheduling done in lx_emul, no timer
interrupt will break such a loop. As a workaround, we check for
necessary jiffies updates inside cpu_relax if interrupts are enabled.
Ref genodelabs/genode#4778
To be able to check for interrupts being on or off,
the enabling and disabling is tracked in lx_emul.
When interrupts get received, they have to be turned off.
Ref genodelabs/genode#4778
Do not start and stop idle ticking within the timer interrupt
routine, but do it around the whole Lx_kit scheduling, which
is always called when Linux code gets active again, either
because of backend signals, interrupts, or timing signals.
This commit implicitly reverts the (incomplete) solution of
issue #4550
Ref genodelabs/genode#4778
Check if we are able to submit the Usb packet before attempting to
allocate it. In case the queue is already full we wait until another
pending packet is freed.
Fixes#4701.
To prevent caching side-effects of USB DMA memory taken from the packet stream
all allocations of USB packets need to be on separated cachelines at least.
Fixgenodelabs/genode#4655
To complement the GPIO support allow for setting and reading input
pins. So far this is needed by drivers that attempt to perform I2C
bit-banging via GPIO pins.
Fixes#4624.
To enable other irqchip declarations beyond the lx_emul generic code base,
make the ARM specific initialization routine public.
Ref genodelabs/genode#4651
