wifi: ath12k: Share RootPD state across UserPDs to avoid duplicate operations

Currently, each ath12k AHB device maintains its own RootPD-related
information. However, RootPD is shared across all UserPD devices, so
RootPD-related operations such as RootPD boot, and notifier registration,
should be performed only once during the first UserPD boot up.

Due to per-device RootPD information, the driver is unable to track
shared RootPD state across multiple UserPDs, which can result in these
operations being performed multiple times.

Fix this by introducing a new ath12k_ahb_rproc_info structure to hold
shared RootPD-related information such as notifier callbacks, boot
state, and number of userPD.

Allocate this structure during the first device probe in
ath12k_ahb_rproc_info_alloc() and reuse the same structure for all
subsequent device probes.

Also handle rproc deconfiguration correctly when multiple UserPDs share a
common RootPD. The RootPD provides shared firmware services and resources
for all UserPDs. Therefore, do not shut down the RootPD while any UserPD
remains powered on or is still in the boot process.

In addition, a UserPD can be powered down before its associated resources
are fully released. Defer g_rproc_info cleanup until all UserPD-related
state and resources have been cleaned up.

For intermediate UserPD removal, cleanup only per-device information
and remove the UserPD from the tracking array while keeping the RootPD
running for remaining active UserPDs.

Note: UserPD IDs start from 1, as ID 0 is used by RootPD, which is
completely handled by the remoteproc driver.

The multi-PD architecture on AHB platforms operates as follows:

                     +-----------------------------+
                     |   Q6 RootPD (rproc)         |
                     |   (Shared Resource)         |
                     |                             |
                     |  - Manages UserPD lifecycle |
                     |  - Provides SSR notifiers   |
                     +--------------+--------------+
                                    |
                                    | Manages
                                    |
              +---------------------+---------------------+
              |                     |                     |
         +----v----+           +----v----+          +----v----+
         | UserPD1 |           | UserPD2 |          | UserPD3 |
         |  ID=1   |           |  ID=2   |          |  ID=3   |
         | (Radio) |           | (Radio) |          | (Radio) |
         +---------+           +---------+          +---------+
              |                     |                     |
              |                     |                     |
         ath12k_ahb           ath12k_ahb           ath12k_ahb
         (device 1)           (device 2)           (device 3)
              |                     |                     |
              +---------------------+---------------------+
                                    |
                                    | All reference
                                    |
                          +---------v----------+
                          | ath12k_ahb_rproc_  |
                          | info (shared)      |
                          |                    |
                          | - tgt_rproc        |
                          | - notifiers        |
                          | - rootpd_ready     |
                          | - num_userpd       |
                          | - userpd[] array   |
                          +--------------------+

Tested-on: IPQ5332 hw1.0 AHB WLAN.WBE.1.6-01275-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aaradhana Sahu <aaradhana.sahu@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Link: https://patch.msgid.link/20260721065038.126046-3-aaradhana.sahu@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions