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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/pci/hotplug/shpchp_ctrl.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'drivers/pci/hotplug/shpchp_ctrl.c')
-rw-r--r-- | drivers/pci/hotplug/shpchp_ctrl.c | 705 |
1 files changed, 705 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c new file mode 100644 index 000000000..6a6705e0c --- /dev/null +++ b/drivers/pci/hotplug/shpchp_ctrl.c @@ -0,0 +1,705 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Standard Hot Plug Controller Driver + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * Copyright (C) 2003-2004 Intel Corporation + * + * All rights reserved. + * + * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include "../pci.h" +#include "shpchp.h" + +static void interrupt_event_handler(struct work_struct *work); +static int shpchp_enable_slot(struct slot *p_slot); +static int shpchp_disable_slot(struct slot *p_slot); + +static int queue_interrupt_event(struct slot *p_slot, u32 event_type) +{ + struct event_info *info; + + info = kmalloc(sizeof(*info), GFP_ATOMIC); + if (!info) + return -ENOMEM; + + info->event_type = event_type; + info->p_slot = p_slot; + INIT_WORK(&info->work, interrupt_event_handler); + + queue_work(p_slot->wq, &info->work); + + return 0; +} + +u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl) +{ + struct slot *p_slot; + u32 event_type; + + /* Attention Button Change */ + ctrl_dbg(ctrl, "Attention button interrupt received\n"); + + p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); + p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); + + /* + * Button pressed - See if need to TAKE ACTION!!! + */ + ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot)); + event_type = INT_BUTTON_PRESS; + + queue_interrupt_event(p_slot, event_type); + + return 0; + +} + +u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl) +{ + struct slot *p_slot; + u8 getstatus; + u32 event_type; + + /* Switch Change */ + ctrl_dbg(ctrl, "Switch interrupt received\n"); + + p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); + p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); + p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); + ctrl_dbg(ctrl, "Card present %x Power status %x\n", + p_slot->presence_save, p_slot->pwr_save); + + if (getstatus) { + /* + * Switch opened + */ + ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot)); + event_type = INT_SWITCH_OPEN; + if (p_slot->pwr_save && p_slot->presence_save) { + event_type = INT_POWER_FAULT; + ctrl_err(ctrl, "Surprise Removal of card\n"); + } + } else { + /* + * Switch closed + */ + ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot)); + event_type = INT_SWITCH_CLOSE; + } + + queue_interrupt_event(p_slot, event_type); + + return 1; +} + +u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl) +{ + struct slot *p_slot; + u32 event_type; + + /* Presence Change */ + ctrl_dbg(ctrl, "Presence/Notify input change\n"); + + p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); + + /* + * Save the presence state + */ + p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); + if (p_slot->presence_save) { + /* + * Card Present + */ + ctrl_info(ctrl, "Card present on Slot(%s)\n", + slot_name(p_slot)); + event_type = INT_PRESENCE_ON; + } else { + /* + * Not Present + */ + ctrl_info(ctrl, "Card not present on Slot(%s)\n", + slot_name(p_slot)); + event_type = INT_PRESENCE_OFF; + } + + queue_interrupt_event(p_slot, event_type); + + return 1; +} + +u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl) +{ + struct slot *p_slot; + u32 event_type; + + /* Power fault */ + ctrl_dbg(ctrl, "Power fault interrupt received\n"); + + p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); + + if (!(p_slot->hpc_ops->query_power_fault(p_slot))) { + /* + * Power fault Cleared + */ + ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n", + slot_name(p_slot)); + p_slot->status = 0x00; + event_type = INT_POWER_FAULT_CLEAR; + } else { + /* + * Power fault + */ + ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot)); + event_type = INT_POWER_FAULT; + /* set power fault status for this board */ + p_slot->status = 0xFF; + ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot); + } + + queue_interrupt_event(p_slot, event_type); + + return 1; +} + +/* The following routines constitute the bulk of the + hotplug controller logic + */ +static int change_bus_speed(struct controller *ctrl, struct slot *p_slot, + enum pci_bus_speed speed) +{ + int rc = 0; + + ctrl_dbg(ctrl, "Change speed to %d\n", speed); + rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed); + if (rc) { + ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n", + __func__); + return WRONG_BUS_FREQUENCY; + } + return rc; +} + +static int fix_bus_speed(struct controller *ctrl, struct slot *pslot, + u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp, + enum pci_bus_speed msp) +{ + int rc = 0; + + /* + * If other slots on the same bus are occupied, we cannot + * change the bus speed. + */ + if (flag) { + if (asp < bsp) { + ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n", + bsp, asp); + rc = WRONG_BUS_FREQUENCY; + } + return rc; + } + + if (asp < msp) { + if (bsp != asp) + rc = change_bus_speed(ctrl, pslot, asp); + } else { + if (bsp != msp) + rc = change_bus_speed(ctrl, pslot, msp); + } + return rc; +} + +/** + * board_added - Called after a board has been added to the system. + * @p_slot: target &slot + * + * Turns power on for the board. + * Configures board. + */ +static int board_added(struct slot *p_slot) +{ + u8 hp_slot; + u8 slots_not_empty = 0; + int rc = 0; + enum pci_bus_speed asp, bsp, msp; + struct controller *ctrl = p_slot->ctrl; + struct pci_bus *parent = ctrl->pci_dev->subordinate; + + hp_slot = p_slot->device - ctrl->slot_device_offset; + + ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n", + __func__, p_slot->device, ctrl->slot_device_offset, hp_slot); + + /* Power on slot without connecting to bus */ + rc = p_slot->hpc_ops->power_on_slot(p_slot); + if (rc) { + ctrl_err(ctrl, "Failed to power on slot\n"); + return -1; + } + + if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) { + rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz); + if (rc) { + ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n", + __func__); + return WRONG_BUS_FREQUENCY; + } + + /* turn on board, blink green LED, turn off Amber LED */ + rc = p_slot->hpc_ops->slot_enable(p_slot); + if (rc) { + ctrl_err(ctrl, "Issue of Slot Enable command failed\n"); + return rc; + } + } + + rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp); + if (rc) { + ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n"); + return WRONG_BUS_FREQUENCY; + } + + bsp = ctrl->pci_dev->subordinate->cur_bus_speed; + msp = ctrl->pci_dev->subordinate->max_bus_speed; + + /* Check if there are other slots or devices on the same bus */ + if (!list_empty(&ctrl->pci_dev->subordinate->devices)) + slots_not_empty = 1; + + ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n", + __func__, slots_not_empty, asp, + bsp, msp); + + rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp); + if (rc) + return rc; + + /* turn on board, blink green LED, turn off Amber LED */ + rc = p_slot->hpc_ops->slot_enable(p_slot); + if (rc) { + ctrl_err(ctrl, "Issue of Slot Enable command failed\n"); + return rc; + } + + /* Wait for ~1 second */ + msleep(1000); + + ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status); + /* Check for a power fault */ + if (p_slot->status == 0xFF) { + /* power fault occurred, but it was benign */ + ctrl_dbg(ctrl, "%s: Power fault\n", __func__); + p_slot->status = 0; + goto err_exit; + } + + if (shpchp_configure_device(p_slot)) { + ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n", + pci_domain_nr(parent), p_slot->bus, p_slot->device); + goto err_exit; + } + + p_slot->status = 0; + p_slot->is_a_board = 0x01; + p_slot->pwr_save = 1; + + p_slot->hpc_ops->green_led_on(p_slot); + + return 0; + +err_exit: + /* turn off slot, turn on Amber LED, turn off Green LED */ + rc = p_slot->hpc_ops->slot_disable(p_slot); + if (rc) { + ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n", + __func__); + return rc; + } + + return(rc); +} + + +/** + * remove_board - Turns off slot and LEDs + * @p_slot: target &slot + */ +static int remove_board(struct slot *p_slot) +{ + struct controller *ctrl = p_slot->ctrl; + u8 hp_slot; + int rc; + + shpchp_unconfigure_device(p_slot); + + hp_slot = p_slot->device - ctrl->slot_device_offset; + p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); + + ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot); + + /* Change status to shutdown */ + if (p_slot->is_a_board) + p_slot->status = 0x01; + + /* turn off slot, turn on Amber LED, turn off Green LED */ + rc = p_slot->hpc_ops->slot_disable(p_slot); + if (rc) { + ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n", + __func__); + return rc; + } + + rc = p_slot->hpc_ops->set_attention_status(p_slot, 0); + if (rc) { + ctrl_err(ctrl, "Issue of Set Attention command failed\n"); + return rc; + } + + p_slot->pwr_save = 0; + p_slot->is_a_board = 0; + + return 0; +} + + +struct pushbutton_work_info { + struct slot *p_slot; + struct work_struct work; +}; + +/** + * shpchp_pushbutton_thread - handle pushbutton events + * @work: &struct work_struct to be handled + * + * Scheduled procedure to handle blocking stuff for the pushbuttons. + * Handles all pending events and exits. + */ +static void shpchp_pushbutton_thread(struct work_struct *work) +{ + struct pushbutton_work_info *info = + container_of(work, struct pushbutton_work_info, work); + struct slot *p_slot = info->p_slot; + + mutex_lock(&p_slot->lock); + switch (p_slot->state) { + case POWEROFF_STATE: + mutex_unlock(&p_slot->lock); + shpchp_disable_slot(p_slot); + mutex_lock(&p_slot->lock); + p_slot->state = STATIC_STATE; + break; + case POWERON_STATE: + mutex_unlock(&p_slot->lock); + if (shpchp_enable_slot(p_slot)) + p_slot->hpc_ops->green_led_off(p_slot); + mutex_lock(&p_slot->lock); + p_slot->state = STATIC_STATE; + break; + default: + break; + } + mutex_unlock(&p_slot->lock); + + kfree(info); +} + +void shpchp_queue_pushbutton_work(struct work_struct *work) +{ + struct slot *p_slot = container_of(work, struct slot, work.work); + struct pushbutton_work_info *info; + + info = kmalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", + __func__); + return; + } + info->p_slot = p_slot; + INIT_WORK(&info->work, shpchp_pushbutton_thread); + + mutex_lock(&p_slot->lock); + switch (p_slot->state) { + case BLINKINGOFF_STATE: + p_slot->state = POWEROFF_STATE; + break; + case BLINKINGON_STATE: + p_slot->state = POWERON_STATE; + break; + default: + kfree(info); + goto out; + } + queue_work(p_slot->wq, &info->work); + out: + mutex_unlock(&p_slot->lock); +} + +static void update_slot_info(struct slot *slot) +{ + slot->hpc_ops->get_power_status(slot, &slot->pwr_save); + slot->hpc_ops->get_attention_status(slot, &slot->attention_save); + slot->hpc_ops->get_latch_status(slot, &slot->latch_save); + slot->hpc_ops->get_adapter_status(slot, &slot->presence_save); +} + +/* + * Note: This function must be called with slot->lock held + */ +static void handle_button_press_event(struct slot *p_slot) +{ + u8 getstatus; + struct controller *ctrl = p_slot->ctrl; + + switch (p_slot->state) { + case STATIC_STATE: + p_slot->hpc_ops->get_power_status(p_slot, &getstatus); + if (getstatus) { + p_slot->state = BLINKINGOFF_STATE; + ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n", + slot_name(p_slot)); + } else { + p_slot->state = BLINKINGON_STATE; + ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n", + slot_name(p_slot)); + } + /* blink green LED and turn off amber */ + p_slot->hpc_ops->green_led_blink(p_slot); + p_slot->hpc_ops->set_attention_status(p_slot, 0); + + queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ); + break; + case BLINKINGOFF_STATE: + case BLINKINGON_STATE: + /* + * Cancel if we are still blinking; this means that we + * press the attention again before the 5 sec. limit + * expires to cancel hot-add or hot-remove + */ + ctrl_info(ctrl, "Button cancel on Slot(%s)\n", + slot_name(p_slot)); + cancel_delayed_work(&p_slot->work); + if (p_slot->state == BLINKINGOFF_STATE) + p_slot->hpc_ops->green_led_on(p_slot); + else + p_slot->hpc_ops->green_led_off(p_slot); + p_slot->hpc_ops->set_attention_status(p_slot, 0); + ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n", + slot_name(p_slot)); + p_slot->state = STATIC_STATE; + break; + case POWEROFF_STATE: + case POWERON_STATE: + /* + * Ignore if the slot is on power-on or power-off state; + * this means that the previous attention button action + * to hot-add or hot-remove is undergoing + */ + ctrl_info(ctrl, "Button ignore on Slot(%s)\n", + slot_name(p_slot)); + update_slot_info(p_slot); + break; + default: + ctrl_warn(ctrl, "Not a valid state\n"); + break; + } +} + +static void interrupt_event_handler(struct work_struct *work) +{ + struct event_info *info = container_of(work, struct event_info, work); + struct slot *p_slot = info->p_slot; + + mutex_lock(&p_slot->lock); + switch (info->event_type) { + case INT_BUTTON_PRESS: + handle_button_press_event(p_slot); + break; + case INT_POWER_FAULT: + ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__); + p_slot->hpc_ops->set_attention_status(p_slot, 1); + p_slot->hpc_ops->green_led_off(p_slot); + break; + default: + update_slot_info(p_slot); + break; + } + mutex_unlock(&p_slot->lock); + + kfree(info); +} + + +static int shpchp_enable_slot (struct slot *p_slot) +{ + u8 getstatus = 0; + int rc, retval = -ENODEV; + struct controller *ctrl = p_slot->ctrl; + + /* Check to see if (latch closed, card present, power off) */ + mutex_lock(&p_slot->ctrl->crit_sect); + rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); + if (rc || !getstatus) { + ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); + goto out; + } + rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); + if (rc || getstatus) { + ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot)); + goto out; + } + rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); + if (rc || getstatus) { + ctrl_info(ctrl, "Already enabled on slot(%s)\n", + slot_name(p_slot)); + goto out; + } + + p_slot->is_a_board = 1; + + /* We have to save the presence info for these slots */ + p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save)); + p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save)); + ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save); + p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); + + if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD && + p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458) + && p_slot->ctrl->num_slots == 1) { + /* handle AMD POGO errata; this must be done before enable */ + amd_pogo_errata_save_misc_reg(p_slot); + retval = board_added(p_slot); + /* handle AMD POGO errata; this must be done after enable */ + amd_pogo_errata_restore_misc_reg(p_slot); + } else + retval = board_added(p_slot); + + if (retval) { + p_slot->hpc_ops->get_adapter_status(p_slot, + &(p_slot->presence_save)); + p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); + } + + update_slot_info(p_slot); + out: + mutex_unlock(&p_slot->ctrl->crit_sect); + return retval; +} + + +static int shpchp_disable_slot (struct slot *p_slot) +{ + u8 getstatus = 0; + int rc, retval = -ENODEV; + struct controller *ctrl = p_slot->ctrl; + + if (!p_slot->ctrl) + return -ENODEV; + + /* Check to see if (latch closed, card present, power on) */ + mutex_lock(&p_slot->ctrl->crit_sect); + + rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); + if (rc || !getstatus) { + ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); + goto out; + } + rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); + if (rc || getstatus) { + ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot)); + goto out; + } + rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); + if (rc || !getstatus) { + ctrl_info(ctrl, "Already disabled on slot(%s)\n", + slot_name(p_slot)); + goto out; + } + + retval = remove_board(p_slot); + update_slot_info(p_slot); + out: + mutex_unlock(&p_slot->ctrl->crit_sect); + return retval; +} + +int shpchp_sysfs_enable_slot(struct slot *p_slot) +{ + int retval = -ENODEV; + struct controller *ctrl = p_slot->ctrl; + + mutex_lock(&p_slot->lock); + switch (p_slot->state) { + case BLINKINGON_STATE: + cancel_delayed_work(&p_slot->work); + fallthrough; + case STATIC_STATE: + p_slot->state = POWERON_STATE; + mutex_unlock(&p_slot->lock); + retval = shpchp_enable_slot(p_slot); + mutex_lock(&p_slot->lock); + p_slot->state = STATIC_STATE; + break; + case POWERON_STATE: + ctrl_info(ctrl, "Slot %s is already in powering on state\n", + slot_name(p_slot)); + break; + case BLINKINGOFF_STATE: + case POWEROFF_STATE: + ctrl_info(ctrl, "Already enabled on slot %s\n", + slot_name(p_slot)); + break; + default: + ctrl_err(ctrl, "Not a valid state on slot %s\n", + slot_name(p_slot)); + break; + } + mutex_unlock(&p_slot->lock); + + return retval; +} + +int shpchp_sysfs_disable_slot(struct slot *p_slot) +{ + int retval = -ENODEV; + struct controller *ctrl = p_slot->ctrl; + + mutex_lock(&p_slot->lock); + switch (p_slot->state) { + case BLINKINGOFF_STATE: + cancel_delayed_work(&p_slot->work); + fallthrough; + case STATIC_STATE: + p_slot->state = POWEROFF_STATE; + mutex_unlock(&p_slot->lock); + retval = shpchp_disable_slot(p_slot); + mutex_lock(&p_slot->lock); + p_slot->state = STATIC_STATE; + break; + case POWEROFF_STATE: + ctrl_info(ctrl, "Slot %s is already in powering off state\n", + slot_name(p_slot)); + break; + case BLINKINGON_STATE: + case POWERON_STATE: + ctrl_info(ctrl, "Already disabled on slot %s\n", + slot_name(p_slot)); + break; + default: + ctrl_err(ctrl, "Not a valid state on slot %s\n", + slot_name(p_slot)); + break; + } + mutex_unlock(&p_slot->lock); + + return retval; +} |