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Arm FF-A updates for v6.10

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1. Support for handling notification pending interrupt(NPI)
 
    The FF-A uses the notification pending interrupt to inform the receiver
    that it has a pending notification. This is a virtual interrupt and is
    used by the following type of receivers:
    - A guest/VM running under a hypervisor(normal world usecase)
    - An S-EL1 SP running under a S-EL2 SPMC(secure world only usecase)
 
    Also, when the FF-A driver is running inside a guest VM under an
    hypervisor, the driver/guest VM doesn't have the permission/capability
    to request the creation of notification bitmaps. For a VM, the hypervisor
    reserves memory for its VM and hypervisor framework notification bitmaps
    and the SPMC reserves memory for its SP and SPMC framework notification
    bitmaps before the hypervisor initializes it.
 
    These changes include skipping of creation of notification bitmaps, some
    refactoring around schedule receiver interrupt(SRI) handling and addition
    of support for NPI.
 
 2. Support for FF-A indirect messaging
 
    The FFA_MSG_SEND2 can be used to transmit a partition message from
    the Tx buffer of the sender(the driver in this case) endpoint to the Rx
    buffer of the receiver endpoint and inform the scheduler that the
    receiver endpoint must be run.
 
 Apart from these two main features, there is an optimisation to avoid
 queuing of a work when already running on the worker queue.
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Merge tag 'ffa-updates-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into soc/drivers

Arm FF-A updates for v6.10

1. Support for handling notification pending interrupt(NPI)

   The FF-A uses the notification pending interrupt to inform the receiver
   that it has a pending notification. This is a virtual interrupt and is
   used by the following type of receivers:
   - A guest/VM running under a hypervisor(normal world usecase)
   - An S-EL1 SP running under a S-EL2 SPMC(secure world only usecase)

   Also, when the FF-A driver is running inside a guest VM under an
   hypervisor, the driver/guest VM doesn't have the permission/capability
   to request the creation of notification bitmaps. For a VM, the hypervisor
   reserves memory for its VM and hypervisor framework notification bitmaps
   and the SPMC reserves memory for its SP and SPMC framework notification
   bitmaps before the hypervisor initializes it.

   These changes include skipping of creation of notification bitmaps, some
   refactoring around schedule receiver interrupt(SRI) handling and addition
   of support for NPI.

2. Support for FF-A indirect messaging

   The FFA_MSG_SEND2 can be used to transmit a partition message from
   the Tx buffer of the sender(the driver in this case) endpoint to the Rx
   buffer of the receiver endpoint and inform the scheduler that the
   receiver endpoint must be run.

Apart from these two main features, there is an optimisation to avoid
queuing of a work when already running on the worker queue.

* tag 'ffa-updates-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Avoid queuing work when running on the worker queue
  firmware: arm_ffa: Fix memory corruption in ffa_msg_send2()
  firmware: arm_ffa: Add support for FFA_MSG_SEND2
  firmware: arm_ffa: Stash the partition properties for query purposes
  firmware: arm_ffa: Fix kernel warning about incorrect SRI/NPI
  firmware: arm_ffa: Add support for handling notification pending interrupt(NPI)
  firmware: arm_ffa: Refactor SRI handling in prepartion to add NPI support
  firmware: arm_ffa: Skip creation of the notification bitmaps

Link: https://lore.kernel.org/r/20240426105051.1527016-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2024-04-29 22:53:53 +02:00
commit 93f9f5a489
2 changed files with 169 additions and 45 deletions
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