On Fri, Oct 02, 2020 at 11:47:21AM -0700, Sean V Kelley wrote: > From: Sean V Kelley <sean.v.kelley@xxxxxxxxx> > > Changes since v7 [1]: > > - No functional changes. > > - Reword bridge patch. > - Noted testing below for #non-native/no RCEC case > (Jonathan Cameron) > > - Separate out pci_walk_bus() into pci_walk_bridge() change. > - Put remaining dev to bridge name changes in the separate patch from v7. > (Bjorn Helgaas) > > [1] https://lore.kernel.org/lkml/20200930215820.1113353-1-seanvk.dev@xxxxxxxxxxxxxxxx/ > > Root Complex Event Collectors (RCEC) provide support for terminating error > and PME messages from Root Complex Integrated Endpoints (RCiEPs). An RCEC > resides on a Bus in the Root Complex. Multiple RCECs can in fact reside on > a single bus. An RCEC will explicitly declare supported RCiEPs through the > Root Complex Endpoint Association Extended Capability. > > (See PCIe 5.0-1, sections 1.3.2.3 (RCiEP), and 7.9.10 (RCEC Ext. Cap.)) > > The kernel lacks handling for these RCECs and the error messages received > from their respective associated RCiEPs. More recently, a new CPU > interconnect, Compute eXpress Link (CXL) depends on RCEC capabilities for > purposes of error messaging from CXL 1.1 supported RCiEP devices. > > DocLink: https://www.computeexpresslink.org/ > > This use case is not limited to CXL. Existing hardware today includes > support for RCECs, such as the Denverton microserver product > family. Future hardware will be forthcoming. > > (See Intel Document, Order number: 33061-003US) > > So services such as AER or PME could be associated with an RCEC driver. > In the case of CXL, if an RCiEP (i.e., CXL 1.1 device) is associated with a > platform's RCEC it shall signal PME and AER error conditions through that > RCEC. > > Towards the above use cases, add the missing RCEC class and extend the > PCIe Root Port and service drivers to allow association of RCiEPs to their > respective parent RCEC and facilitate handling of terminating error and PME > messages. > > Tested-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> #non-native/no RCEC > > > Jonathan Cameron (1): > PCI/AER: Extend AER error handling to RCECs > > Qiuxu Zhuo (5): > PCI/RCEC: Add RCEC class code and extended capability > PCI/RCEC: Bind RCEC devices to the Root Port driver > PCI/AER: Apply function level reset to RCiEP on fatal error > PCI/RCEC: Add RCiEP's linked RCEC to AER/ERR > PCI/AER: Add RCEC AER error injection support > > Sean V Kelley (8): > PCI/RCEC: Cache RCEC capabilities in pci_init_capabilities() > PCI/ERR: Rename reset_link() to reset_subordinate_device() > PCI/ERR: Use "bridge" for clarity in pcie_do_recovery() > PCI/ERR: Add pci_walk_bridge() to pcie_do_recovery() > PCI/ERR: Limit AER resets in pcie_do_recovery() > PCI/RCEC: Add pcie_link_rcec() to associate RCiEPs > PCI/AER: Add pcie_walk_rcec() to RCEC AER handling > PCI/PME: Add pcie_walk_rcec() to RCEC PME handling > > drivers/pci/pci.h | 25 ++++- > drivers/pci/pcie/Makefile | 2 +- > drivers/pci/pcie/aer.c | 36 ++++-- > drivers/pci/pcie/aer_inject.c | 5 +- > drivers/pci/pcie/err.c | 109 +++++++++++++++---- > drivers/pci/pcie/pme.c | 15 ++- > drivers/pci/pcie/portdrv_core.c | 8 +- > drivers/pci/pcie/portdrv_pci.c | 8 +- > drivers/pci/pcie/rcec.c | 187 ++++++++++++++++++++++++++++++++ > drivers/pci/probe.c | 2 + > include/linux/pci.h | 5 + > include/linux/pci_ids.h | 1 + > include/uapi/linux/pci_regs.h | 7 ++ > 13 files changed, 367 insertions(+), 43 deletions(-) > create mode 100644 drivers/pci/pcie/rcec.c Thank you very much for your work and patience with this series! Applied to pci/err for v5.10 with the following changes: - Make pci_rcec_init() void since return value was unused. - Reorder pci_rcec_init() so rcec_ea is filled in before publishing in dev->rcec_ea. - Split pcie_do_recovery() patches up a little more. My hope was to make the "Use 'bridge' for clarity" patch more of a pure rename patch and easier to review. Not sure I accomplished that. - Log messages and uevents with "bridge", not "dev", in pcie_do_recovery() to preserve previous behavior. - Rename reset_subordinate_devices() to reset_subordinates() for brevity. - Fix kerneldoc issues (reported with "make W=1"). - Fix whitespace (lines didn't use the full width or > 80 columns, etc). Please let me know if I botched anything.
