[v12,00/20] cxl/pci: Add support for RCH RAS error handling

  This patchset enables CXL RCH error handling. This is necessary because RCH
downstream port protocol error handling is implemented uniquely and not
currently supported. These patches address the following:

   * Discovery and mapping of RCH downstream port AER registers.

   * AER portdrv changes to support CXL RCH protocol errors. 

   * Interrupt setup specific to RCH mode: enabling RCEC internal
     errors and disabling root port interrupts.

   * Logging RCH downstream port AER and RAS errors.

Changes in v12:
  - [terry, rric] Addressed Jon's review comments:
    - Renamed function devm_cxl_setup_parent_dport() to
      cxl_setup_parent_dport()
    - cxl_rcrb_to_aer(): Using goto as exit path, added comment
    - devm_cxl_setup_hdm():
      - Initialize @reg_map immediately
      - Added comment
      - Early exit on success
      - Change debug into error message
    - cxl/port: Fix @host confusion in cxl_dport_setup_regs()
      - Moved rename of @comp_map to @reg_map into next patch
    - Updated SOB chains
  - [terry] cxl_error_is_native(): Removed native_cxl_error check as
    this is for CXL device error handling only, not protocol errors.
  - [rric] patch #1: Added Fixes: tag

Changes in v11:
  - Rebased onto cxl/fixes (c66650d29764)
  - Added: cxl/port: Fix release of RCD endpoints
  - Added: cxl/core/regs: Rename @dev to @host in struct cxl_register_map
  - Added: cxl/port: Fix @host confusion in cxl_dport_setup_regs()
  - Added: cxl/port: Rename @comp_map to @reg_map in struct cxl_register_map
  - Removed: cxl/regs: Prepare for multiple users of register mappings
  - Modified: cxl/hdm: Use stored Component Register mappings to map
    HDM decoder capability
    - Dan: rework to drop cxl_port_get_comp_map()
  - Added: cxl/pci: Introduce config option PCIEAER_CXL
  - Modified: cxl/pci: Add RCH downstream port AER register discovery
    - Moved AER discovery to devm_cxl_setup_parent_dport() called when
      memdev is probed
    - Fixed devm_cxl_iomap_block() release by fixing devm host
  - Modified: cxl/pci: Map RCH downstream AER registers for logging
    protocol errors
    - Reworded description
    - Moved register mappings to devm_cxl_setup_parent_dport() called
     when memdev is probed
  - Modified: cxl/pci: Disable root port interrupts in RCH mode
    - Call cxl_disable_rch_root_ints() in devm_cxl_setup_parent_dport()
      called when memdev is probed
    - Fixed resource release by fixing devm host
  - Reworded description of PCIEAER_CXL config option
  - Added: cxl/core/regs: Rework cxl_map_pmu_regs() to use map->dev for
    devm

Changes in v10:
  - Updated cxl_setup_comp_regs() in patch#1 to include
    cxl_register_map::reg_type default value initialization.
  
Changes in v9:
  - Added: cxl/regs: Prepare for multiple users of register mappings,
  - Updated use of cxl_map_component_regs() and cxl_map_device_regs

Changes in V8:
  - Rebased onto: commit
    0c0df63177e3 ("Merge branch 'for-6.5/cxl-rch-eh' into for-6.5/cxl")
  - cxl/port: Pre-initialize component register mappings
    - Added patch to pre-initialize component register mappings.
  - cxl/pci: Remove Component Register base address from
    - Separated removal of Component Register base address in struct
    cxl_dev_state to not break functionality.
  - cxl/hdm: Use stored Component Register mappings to map HDM decoder
    capability
    - Implemented a less strict check in devm_cxl_setup_hdm(), be tolerant
    if HDM decoder registers are not implemented.
  - cxl/pci: Map RCH downstream AER registers for  logging protocol errors
    - Fixed uninitialized access of map->dev in cxl_dport_map_regs().
  - PCI/AER: Forward RCH downstream port-detected errors to the CXL.mem
    dev handler
    - Fix typo in patch description.
  - cxl/pci: Update CXL error logging to use RAS register address
    - Fix typo in patch description.
    
Changes in V7:
  - cxl: Updates for CXL Test to work with RCH
    - Removed Robert's DSO.
  - cxl/core/regs: Add @dev to cxl_register_map
    - Corrected typo in patch description.
  - PCI/AER: Unmask RCEC internal errors to enable RCH downstream port
    error handling.
    - Changed int variable to bool.
  - cxl/pci: Map RCH downstream AER registers for logging protocol errors
    - Corrected patch description.
  - cxl/pci: Add RCH downstream port AER register discovery
    - Reverted empty line removal.
  - cxl/port: Store the port's Component Register mappings in struct
    cxl_port
    - Update to use structure initialization in cxl_setup_comp_regs().
  - Remove first patch (already in the tree) and added patch 27/27.
    - Was a one-off error caused when merging branches during internal
    review.

Changes in V6:
  - Added patch for cxl test fixes: 'cxl: Update CXl Test to Work with
    RCH'. Patch from Dan.
  - Simplified: 'cxl/rch: Prepare for caching the MMIO mapped PCIe AER
    capability'. Patch from Dan.
  - Added patch: 'cxl: Rename 'uport' to 'uport_dev''
  - Updated patch: 'cxl: Rename member @dport of struct cxl_dport to
    @dport_dev'
  - Updated *map assignment to use structure init in 'cxl/core/regs: Add
    @dev to cxl_register_map'. Also fixed whitespace.
  - Removed extra whitespace in 'cxl/core/regs: Add @dev to
    cxl_register_map'
  - Updated patch subject: 'cxl/acpi: Move add_host_bridge_uport() after
    cxl_get_chbs()'
  - Changes to work with CXL test. 'cxl/acpi: Directly bind the CEDT
    detected CHBCR to the Host Bridge's port'
  - 'cxl/pci: Early setup RCH dport component registers from RCRB'
    - Removed parameter from cxl_rcrb_get_comp_regs().
    - Changed return value to EPROBE_DEFER for retry during ACPI
      initialization.
    - Changed map to us struct initialization.
  - Remove ENODEV check in 'cxl/port: Store the downstream port's
    Component Register mappings in struct cxl_dport'
  - 'cxl/port: Remove Component Register base address from struct
    cxl_dport'
    - Moved earlier with same removal for cxl_port.
  - cxl/pci: Add RCH downstream port AER register discovery
    - Flattened {request,release}_mem_region() and ioremap() into
      cxl_rcrb_to_aer().
    - Add check if OS is assigned AER handling before discovering AER.
  - Added CXL namespace import to cxl_core (drivers/cxl/core/port.c).
    Needed for using pci_print_aer(). In 'PCI/AER: Refactor
    cper_print_aer() for use by CXL driver module'.
  - cxl/pci: Map RCH downstream AER registers for logging protocol errors
    - Changed dport device used in devm_cxl_iomap_block() call to be
      port->dev.
    - Removed ENODEV check.
  - cxl/pci: Disable root port interrupts in RCH mode
    - Removed unnecessary 'rch' check.
    - Moved cxl_disable_rch_root_ints() into core/pci.c. 
    - Added OSC AER assignment check before accessing AER registers.
  - cxl/pci: Update CXL error logging to use RAS register address
    - Renamed function handlers.
  - cxl/pci: Add RCH downstream port error logging
    - Moved RCD check to caller.
    - Added put_dev() after call to cxl_pci_find_port().
                                                          
Changes in V5:
  - Split 'cxl/rch: Prepare for logging RCH downstream port protocol
    errors' patch into 2 patches.
  - Added:
    cxl/core/regs: Rename phys_addr in cxl_map_component_regs()
    cxl/mem: Prepare for early RCH dport component register setup
  - Correct comments CXL3.0 to CXL 3.0.
  - changed cxl_port_get_comp_map() to static.

Changes in V4:
  - Made port RAS register discovery common and called from
    __devm_cxl_add_dport().
  - Changed RCH AER register discovery to be called from
    __devm_cxl_add_dport().
  - Changed RAS and RCH AER register mapping to be called from
    __devm_cxl_add_dport().
  - Changed component register mapping to support all CXL component
    mapping, cxl_map_component_regs().
  - Added cxl_regs to 'struct cxl_dport' for providing RCH downstream port
    mapped registers USED in error handler.
  - PCI/AER:
      - Improved description of PCIEAER_CXL option in Kconfig.
      - Renamed function to pci_aer_unmask_internal_errors(), added
        pcie_aer_is_native() check.
      - Improved comments and added spec refs.
      - Renamed functions to cxl_rch_handle_error*().
      - Modified cxl_rch_handle_error_iter() to only call the handler
        callbacks, this also simplifies refcounting of the pdev.
      - Refactored handle_error_source(), created pci_aer_handle_error().
      - Changed printk messages to pci_*() variants.
      - Added check for pcie_aer_is_native() to the RCEC.
      - Introduced function cxl_rch_enable_rcec().
      - Updated patch description ("PCI/AER: Forward RCH downstream
      port-detected errors to the CXL.mem dev handler").

Changes in V3:
  - Correct base commit in cover sheet.
  - Change hardcoded return 0 to NULL in regs.c.
  - Remove calls to pci_disable_pcie_error_reporting(pdev) and
    pci_enable_pcie_error_reporting(pdev) in mem.c;
  - Move RCEC interrupt unmask to PCIe port AER driver's probe.
    - Fixes missing PCIEAER and PCIEPORTBUS config option error.
  - Rename cxl_rcrb_setup() to cxl_setup_rcrb() in mem.c.
  - Update cper_mem_err_unpack() patch subject and description.

Changes in V2:
  - Refactor RCH initialization into cxl_mem driver.
    - Includes RCH RAS and AER register discovery and mapping.
  - Add RCEC protocol error interrupt forwarding to CXL endpoint
    handler.
  - Change AER and RAS logging to use existing trace routines.
  - Enable RCEC AER internal errors.

Dan Williams (1):
  cxl/port: Fix @host confusion in cxl_dport_setup_regs()

Robert Richter (13):
  cxl/port: Fix release of RCD endpoints
  cxl/core/regs: Rename @dev to @host in struct cxl_register_map
  cxl/port: Rename @comp_map to @reg_map in struct cxl_register_map
  cxl/port: Pre-initialize component register mappings
  cxl/pci: Store the endpoint's Component Register mappings in struct
    cxl_dev_state
  cxl/hdm: Use stored Component Register mappings to map HDM decoder
    capability
  cxl/pci: Remove Component Register base address from struct
    cxl_dev_state
  cxl/port: Remove Component Register base address from struct cxl_port
  cxl/pci: Introduce config option PCIEAER_CXL
  PCI/AER: Forward RCH downstream port-detected errors to the CXL.mem
    dev handler
  PCI/AER: Unmask RCEC internal errors to enable RCH downstream port
    error handling
  cxl/core/regs: Rename phys_addr in cxl_map_component_regs()
  cxl/core/regs: Rework cxl_map_pmu_regs() to use map->dev for devm

Terry Bowman (6):
  cxl/pci: Add RCH downstream port AER register discovery
  PCI/AER: Refactor cper_print_aer() for use by CXL driver module
  cxl/pci: Update CXL error logging to use RAS register address
  cxl/pci: Map RCH downstream AER registers for logging protocol errors
  cxl/pci: Add RCH downstream port error logging
  cxl/pci: Disable root port interrupts in RCH mode

 drivers/cxl/core/core.h      |   1 +
 drivers/cxl/core/hdm.c       |  49 ++++----
 drivers/cxl/core/mbox.c      |   2 +
 drivers/cxl/core/pci.c       | 223 +++++++++++++++++++++++++++++++++--
 drivers/cxl/core/port.c      | 104 +++++++++++-----
 drivers/cxl/core/regs.c      |  73 +++++++++---
 drivers/cxl/cxl.h            |  34 ++++--
 drivers/cxl/cxlmem.h         |   4 +-
 drivers/cxl/mem.c            |   7 +-
 drivers/cxl/pci.c            |  14 +--
 drivers/pci/pcie/Kconfig     |   9 ++
 drivers/pci/pcie/aer.c       | 159 ++++++++++++++++++++++++-
 include/linux/aer.h          |   2 +-
 tools/testing/cxl/test/mem.c |   1 -
 14 files changed, 558 insertions(+), 124 deletions(-)


base-commit: c66650d29764e228eba40b7a59fdb70fa6567daa