kernel/linux.git/include/acpi/pcc.h, branch v6.6.131

mailbox: pcc: Check before sending MCTP PCC response ACK

2025-01-09T12:31:45+00:00

[ Upstream commit 7f9e19f207be0c534d517d65e01417ba968cdd34 ] Type 4 PCC channels have an option to send back a response to the platform when they are done processing the request. The flag to indicate whether or not to respond is inside the message body, and thus is not available to the pcc mailbox. If the flag is not set, still set command completion bit after processing message. In order to read the flag, this patch maps the shared buffer to virtual memory. To avoid duplication of mapping the shared buffer is then made available to be used by the driver that uses the mailbox. Signed-off-by: Adam Young Cc: Sudeep Holla Signed-off-by: Jassi Brar Signed-off-by: Sasha Levin

ACPI: PCC: Add PCC shared memory region command and status bitfields

2025-01-09T12:31:45+00:00

[ Upstream commit 55d235ebb684b993b3247740c1c8e273f8af4a54 ] Define the common macros to use when referring to various bitfields in the PCC generic communications channel command and status fields. Currently different drivers that need to use these bitfields have defined these locally. This common macro is intended to consolidate and replace those. Cc: "Rafael J. Wysocki" Link: https://lore.kernel.org/r/20230927-pcc_defines-v2-1-0b8ffeaef2e5@arm.com Signed-off-by: Sudeep Holla Stable-dep-of: 7f9e19f207be ("mailbox: pcc: Check before sending MCTP PCC response ACK") Signed-off-by: Sasha Levin

mailbox: pcc: Use PCC mailbox channel pointer instead of standard

2021-10-30T03:46:38+00:00

Now that we have all the shared memory region information populated in the pcc_mbox_chan, let us propagate the pointer to the same as the return value to pcc_mbox_request channel. This eliminates the need for the individual users of PCC mailbox to parse the PCCT subspace entries and fetch the shmem information. This also eliminates the need for PCC mailbox controller to set con_priv to PCCT subspace entries. This is required as con_priv is private to the controller driver to attach private data associated with the channel and not meant to be used by the mailbox client/users. Let us convert all the users of pcc_mbox_{request,free}_channel to use new interface. Cc: Jean Delvare Signed-off-by: Sudeep Holla Acked-by: Wolfram Sang Acked-by: Guenter Roeck Signed-off-by: Jassi Brar

mailbox: pcc: Add pcc_mbox_chan structure to hold shared memory region info

2021-10-30T03:46:38+00:00

Currently PCC mailbox controller sets con_priv in each channel to hold the pointer to pcct subspace entry it corresponds to. The mailbox user will then fetch this pointer from the channel descriptor they get when they request for the channel. Using that pointer they then parse the pcct entry again to fetch all the information about shared memory region. In order to remove individual users of PCC mailbox parsing the PCCT subspace entries to fetch same information, let us consolidate the same in pcc mailbox controller by parsing all the shared memory region information into a structure that can also hold the mbox_chan pointer it represent. This can then be used as main PCC mailbox channel pointer that we can return as part of pcc_mbox_request_channel instead of standard mailbox channel pointer. Reviewed-by: Cristian Marussi Signed-off-by: Sudeep Holla Signed-off-by: Jassi Brar

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441

2019-06-05T15:37:17+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Armijn Hemel Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman

mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file

2017-11-08T23:39:53+00:00

Move the MAX_PCC_SUBSPACES definition to acpi/pcc.h file in preparation to add subspace ID support for cppc_acpi driver. Signed-off-by: George Cherian Reviewed-by: Prashanth Prakash Signed-off-by: Rafael J. Wysocki

mailbox: PCC: Fix return value of pcc_mbox_request_channel()

2016-10-17T12:26:49+00:00

When CONFIG_PCC is disabled, pcc_mbox_request_channel() needs to return ERR_PTR(-ENODEV), not a NULL pointer, as the callers of this function use IS_ERR() to check for error code. Signed-off-by: Duc Dang Signed-off-by: Hoan Tran Signed-off-by: Rafael J. Wysocki

mailbox: pcc: Add PCC request and free channel declarations

2016-06-25T00:53:37+00:00

Exports pcc_mbox_request_channel() and pcc_mbox_free_channel() declarations into a pcc.h header file. Looks-good-to: Prashanth Prakash Signed-off-by: Hoan Tran Signed-off-by: Rafael J. Wysocki