- Use the existing gasket_interrupt_msix_cleanup at suspend time to
remove our IRQs from the system. Without doing this, we leave 13 IRQs
per device registered, which can cause issues during suspend if many
devices are loaded in the system.
- Restore them at resume time, using the gasket_interrupt_reinit
functionality.
- This allows successful suspend without any errors taking the CPUs
down, and passing the multi-tpu stress test after resume.
Change-Id: Ied1aca8605c0cb3b64ba591d05312d10cf45343f
Add interrupt type DEVICE_MANAGED, indicating that the device driver
manages interrupt setup and handling. Future non-PCI wire interrupts
will use this type, calling gasket_handle_interrupt(), which is now made
non-static, to call into the gasket framework in order to update sysfs
files for interrupt counts and other framework interfaces.
Change-Id: Ie0be3d950ed2706f7ada848c19ddf7017e9623b2
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Pass the gasket driver descriptor to the interrupt init function, rather
than exploding out separate parameters from various fields of that
structure. This allows us to make more localized changes to the types
of interrupts supported (MSIX vs. wire, etc.) without affecting the
calling sequence, and seems nicer for simplification purposes.
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Now that the SPDX tag is in all gasket files, that identifies the
license in a specific and legally-defined manner. So the extra GPL text
wording can be removed as it is no longer needed at all.
This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text. And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.
Cc: Rob Springer <rspringer@google.com>
Cc: John Joseph <jnjoseph@google.com>
Cc: Ben Chan <benchan@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.
Fix up the all of the staging gasket files to have a proper SPDX
identifier, based on the license text in the file itself. The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.
Cc: Rob Springer <rspringer@google.com>
Cc: John Joseph <jnjoseph@google.com>
Cc: Ben Chan <benchan@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The Gasket (Google ASIC Software, Kernel Extensions, and Tools) kernel
framework is a generic, flexible system that supports thin kernel
drivers. Gasket kernel drivers are expected to handle opening and
closing devices, mmap'ing BAR space as requested, a small selection of
ioctls, and handling page table translation (covered below). Any other
functions should be handled by userspace code.
The Gasket common module is not enough to run a device. In order to
customize the Gasket code for a given piece of hardware, a device
specific module must be created. At a minimum, this module must define a
struct gasket_driver_desc containing the device-specific data for use by
the framework; in addition, the module must declare an __init function
that calls gasket_register_device with the module's gasket_driver_desc
struct. Finally, the driver must define an exit function that calls
gasket_unregister_device with the module's gasket_driver_desc struct.
One of the core assumptions of the Gasket framework is that precisely
one process is allowed to have an open write handle to the device node
at any given time. (That process may, once it has one write handle, open
any number of additional write handles.) This is accomplished by
tracking open and close data for each driver instance.
Change-Id: I0ce1dc1dc9c533026adbc3aacaefb830ecdbc3e9
Signed-off-by: Rob Springer <rspringer@google.com>
Signed-off-by: John Joseph <jnjoseph@google.com>
Signed-off-by: Simon Que <sque@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
