linux-kernel - [PATCH v4 00/10] PCI: endpoint: Make host reboot handling more robust

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Message-Id: <20240430-pci-epf-rework-v4-0-22832d0d456f@linaro.org>
Date: Tue, 30 Apr 2024 11:43:41 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Jingoo Han <jingoohan1@...il.com>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, mhi@...ts.linux.dev, 
 linux-tegra@...r.kernel.org, Niklas Cassel <cassel@...nel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Damien Le Moal <dlemoal@...nel.org>, Bjorn Helgaas <helgaas@...nel.org>
Subject: [PATCH v4 00/10] PCI: endpoint: Make host reboot handling more
 robust

Hello,

This is the follow up series of [1], to improve the handling of host reboot in
the endpoint subsystem. This involves refining the PERST# and Link Down event
handling in both the controller and function drivers.

Testing
=======

This series is tested on Qcom SM8450 based development board with both MHI_EPF
and EPF_TEST function drivers. And also by Niklas on Rockchip platform.

Dependency
==========

This series depends on [1] and [2] which are currently in pci/next.

- Mani

[1] https://lore.kernel.org/linux-pci/20240314-pci-dbi-rework-v10-0-14a45c5a938e@linaro.org/
[2] https://lore.kernel.org/linux-pci/20240320113157.322695-1-cassel@kernel.org/

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---

Changes in v4:
- Reworded the pci_epc_bme_notify() Kdoc (Bjorn)
- Added a patch to drop 'Link is enabled' for BME event (Bjorn)
- Collected tags from Niklas
- Rebased on top of pci/next

Changes in v3:
- Dropped the patch that split epc_events into two
- Added a patch to rename BME to Bus Master Enable
- Added back the comment for REBAR
- Switched to cancel_delayed_work_sync() for Link Down event
- Rebased on top of pci/next
- Dropped the tested-by tag from Niklas as I'd like to get this series tested
  one more time due to changes
- Link to v2: https://lore.kernel.org/r/20240401-pci-epf-rework-v2-0-970dbe90b99d@linaro.org

Changes in v2:
- Dropped the {start/stop}_link rework patches
- Incorporated comments from Niklas
- Collected review tags
- Rebased on top of v6.9-rc1 and https://lore.kernel.org/linux-pci/20240320113157.322695-1-cassel@kernel.org/
- Link to v1: https://lore.kernel.org/r/20240314-pci-epf-rework-v1-0-6134e6c1d491@linaro.org

---
Manivannan Sadhasivam (10):
      PCI: qcom-ep: Disable resources unconditionally during PERST# assert
      PCI: endpoint: Rename core_init() callback in 'struct pci_epc_event_ops' to epc_init()
      PCI: endpoint: Rename BME to Bus Master Enable
      PCI: qcom-ep: Drop 'Link is enabled' from the debug message for BME event
      PCI: endpoint: pci-epf-test: Refactor pci_epf_test_unbind() function
      PCI: endpoint: pci-epf-{mhi/test}: Move DMA initialization to EPC init callback
      PCI: endpoint: Introduce 'epc_deinit' event and notify the EPF drivers
      PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API to handle Link Down event
      PCI: qcom-ep: Use the generic dw_pcie_ep_linkdown() API to handle Link Down event
      PCI: endpoint: pci-epf-test: Handle Link Down event

 drivers/pci/controller/dwc/pcie-designware-ep.c | 104 ++++++++++++++++--------
 drivers/pci/controller/dwc/pcie-designware.h    |   5 ++
 drivers/pci/controller/dwc/pcie-qcom-ep.c       |  13 +--
 drivers/pci/controller/dwc/pcie-tegra194.c      |   1 +
 drivers/pci/endpoint/functions/pci-epf-mhi.c    |  47 +++++++----
 drivers/pci/endpoint/functions/pci-epf-test.c   |  95 ++++++++++++++++------
 drivers/pci/endpoint/pci-epc-core.c             |  60 ++++++++++----
 include/linux/pci-epc.h                         |   3 +-
 include/linux/pci-epf.h                         |  10 ++-
 9 files changed, 231 insertions(+), 107 deletions(-)
---
base-commit: b4d6d92902f50a577021f2cc08ac680b10658aca
change-id: 20240314-pci-epf-rework-a6e65b103a79

Best regards,
-- 
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>