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-----BEGIN PGP SIGNATURE----- iQJIBAABCgAyFiEEgMe7l+5h9hnxdsnuWYigwDrT+vwFAlzZ/4MUHGJoZWxnYWFz QGdvb2dsZS5jb20ACgkQWYigwDrT+vwmYw/+Mzkkz/zOpzYdsYyy6Xv3qRdn92Kp bePOPACdwpUK+HV4qE6EEYBcVZdkO7NMkshA7wIb4VlsE0sVHSPvlybUmTUGWeFd CG87YytVOo4K7cAeKdGVwGaoQSeaZX3wmXVGGQtm/T4b63GdBjlNJ/MBuPWDDMlM XEis29MTH6xAu3MbT7pp5q+snSzOmt0RWuVpX/U1YcZdhu8fbwfOxj9Jx6slh4+2 MvseYNNrTRJrMF0o5o83Khx3tAcW8OTTnDJ9+BCrAlE1PId1s/KjzY6nqReBtom9 CIqtwAlx/wGkRBRgfsmEtFBhkDA05PPilhSy6k2LP8B4A3qBqir1Pd+5bhHG4FIu nPPCZjZs2+0DNrZwQv59qIlWsqDFm214WRln9Z7d/VNtrLs2UknVghjQcHv7rP+K /NKfPlAuHTI/AFi9pIPFWTMx5J4iXX1hX4LiptE9M0k9/vSiaCVnTS3QbFvp3py3 VTT9sprzfV4JX4aqS/rbQc/9g4k9OXPW9viOuWf5rYZJTBbsu6PehjUIRECyFaO+ 0gDqE8WsQOtNNX7e5q2HJ/HpPQ+Q1IIlReC+1H56T/EQZmSIBwhTLttQMREL/8af Lka3/1SVUi4WG6SBrBI75ClsR91UzE6AK+h9fAyDuR6XJkbysWjkyG6Lmy617g6w lb+fQwOzUt4eGDo= =4Vc+ -----END PGP SIGNATURE----- Merge tag 'pci-v5.2-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: "Enumeration changes: - Add _HPX Type 3 settings support, which gives firmware more influence over device configuration (Alexandru Gagniuc) - Support fixed bus numbers from bridge Enhanced Allocation capabilities (Subbaraya Sundeep) - Add "external-facing" DT property to identify cases where we require IOMMU protection against untrusted devices (Jean-Philippe Brucker) - Enable PCIe services for host controller drivers that use managed host bridge alloc (Jean-Philippe Brucker) - Log PCIe port service messages with pci_dev, not the pcie_device (Frederick Lawler) - Convert pciehp from pciehp_debug module parameter to generic dynamic debug (Frederick Lawler) Peer-to-peer DMA: - Add whitelist of Root Complexes that support peer-to-peer DMA between Root Ports (Christian König) Native controller drivers: - Add PCI host bridge DMA ranges for bridges that can't DMA everywhere, e.g., iProc (Srinath Mannam) - Add Amazon Annapurna Labs PCIe host controller driver (Jonathan Chocron) - Fix Tegra MSI target allocation so DMA doesn't generate unwanted MSIs (Vidya Sagar) - Fix of_node reference leaks (Wen Yang) - Fix Hyper-V module unload & device removal issues (Dexuan Cui) - Cleanup R-Car driver (Marek Vasut) - Cleanup Keystone driver (Kishon Vijay Abraham I) - Cleanup i.MX6 driver (Andrey Smirnov) Significant bug fixes: - Reset Lenovo ThinkPad P50 GPU so nouveau works after reboot (Lyude Paul) - Fix Switchtec firmware update performance issue (Wesley Sheng) - Work around Pericom switch link retraining erratum (Stefan Mätje)" * tag 'pci-v5.2-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (141 commits) MAINTAINERS: Add Karthikeyan Mitran and Hou Zhiqiang for Mobiveil PCI PCI: pciehp: Remove pointless MY_NAME definition PCI: pciehp: Remove pointless PCIE_MODULE_NAME definition PCI: pciehp: Remove unused dbg/err/info/warn() wrappers PCI: pciehp: Log messages with pci_dev, not pcie_device PCI: pciehp: Replace pciehp_debug module param with dyndbg PCI: pciehp: Remove pciehp_debug uses PCI/AER: Log messages with pci_dev, not pcie_device PCI/DPC: Log messages with pci_dev, not pcie_device PCI/PME: Replace dev_printk(KERN_DEBUG) with dev_info() PCI/AER: Replace dev_printk(KERN_DEBUG) with dev_info() PCI: Replace dev_printk(KERN_DEBUG) with dev_info(), etc PCI: Replace printk(KERN_INFO) with pr_info(), etc PCI: Use dev_printk() when possible PCI: Cleanup setup-bus.c comments and whitespace PCI: imx6: Allow asynchronous probing PCI: dwc: Save root bus for driver remove hooks PCI: dwc: Use devm_pci_alloc_host_bridge() to simplify code PCI: dwc: Free MSI in dw_pcie_host_init() error path PCI: dwc: Free MSI IRQ page in dw_pcie_free_msi() ...
425 lines
10 KiB
C
425 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PCI Express Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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* Copyright (C) 2003-2004 Intel Corporation
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*
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* All rights reserved.
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*
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* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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*
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*/
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#define dev_fmt(fmt) "pciehp: " fmt
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pm_runtime.h>
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#include <linux/pci.h>
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#include "pciehp.h"
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/* The following routines constitute the bulk of the
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hotplug controller logic
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*/
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#define SAFE_REMOVAL true
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#define SURPRISE_REMOVAL false
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static void set_slot_off(struct controller *ctrl)
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{
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/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
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if (POWER_CTRL(ctrl)) {
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pciehp_power_off_slot(ctrl);
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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}
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pciehp_green_led_off(ctrl);
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pciehp_set_attention_status(ctrl, 1);
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}
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/**
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* board_added - Called after a board has been added to the system.
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* @ctrl: PCIe hotplug controller where board is added
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*
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* Turns power on for the board.
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* Configures board.
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*/
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static int board_added(struct controller *ctrl)
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{
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int retval = 0;
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struct pci_bus *parent = ctrl->pcie->port->subordinate;
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if (POWER_CTRL(ctrl)) {
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/* Power on slot */
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retval = pciehp_power_on_slot(ctrl);
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if (retval)
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return retval;
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}
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pciehp_green_led_blink(ctrl);
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/* Check link training status */
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retval = pciehp_check_link_status(ctrl);
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if (retval) {
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ctrl_err(ctrl, "Failed to check link status\n");
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goto err_exit;
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}
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/* Check for a power fault */
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if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
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ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
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retval = -EIO;
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goto err_exit;
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}
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retval = pciehp_configure_device(ctrl);
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if (retval) {
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if (retval != -EEXIST) {
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ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
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pci_domain_nr(parent), parent->number);
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goto err_exit;
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}
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}
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pciehp_green_led_on(ctrl);
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pciehp_set_attention_status(ctrl, 0);
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return 0;
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err_exit:
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set_slot_off(ctrl);
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return retval;
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}
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/**
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* remove_board - Turns off slot and LEDs
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* @ctrl: PCIe hotplug controller where board is being removed
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* @safe_removal: whether the board is safely removed (versus surprise removed)
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*/
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static void remove_board(struct controller *ctrl, bool safe_removal)
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{
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pciehp_unconfigure_device(ctrl, safe_removal);
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if (POWER_CTRL(ctrl)) {
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pciehp_power_off_slot(ctrl);
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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/* Ignore link or presence changes caused by power off */
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atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
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&ctrl->pending_events);
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}
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/* turn off Green LED */
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pciehp_green_led_off(ctrl);
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}
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static int pciehp_enable_slot(struct controller *ctrl);
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static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
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void pciehp_request(struct controller *ctrl, int action)
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{
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atomic_or(action, &ctrl->pending_events);
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if (!pciehp_poll_mode)
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irq_wake_thread(ctrl->pcie->irq, ctrl);
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}
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void pciehp_queue_pushbutton_work(struct work_struct *work)
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{
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struct controller *ctrl = container_of(work, struct controller,
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button_work.work);
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case BLINKINGOFF_STATE:
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pciehp_request(ctrl, DISABLE_SLOT);
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break;
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case BLINKINGON_STATE:
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pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
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break;
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default:
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break;
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}
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mutex_unlock(&ctrl->state_lock);
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}
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void pciehp_handle_button_press(struct controller *ctrl)
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{
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case OFF_STATE:
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case ON_STATE:
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if (ctrl->state == ON_STATE) {
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ctrl->state = BLINKINGOFF_STATE;
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ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
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slot_name(ctrl));
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} else {
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ctrl->state = BLINKINGON_STATE;
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ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
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slot_name(ctrl));
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}
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/* blink green LED and turn off amber */
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pciehp_green_led_blink(ctrl);
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pciehp_set_attention_status(ctrl, 0);
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schedule_delayed_work(&ctrl->button_work, 5 * HZ);
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break;
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case BLINKINGOFF_STATE:
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case BLINKINGON_STATE:
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/*
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* Cancel if we are still blinking; this means that we
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* press the attention again before the 5 sec. limit
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* expires to cancel hot-add or hot-remove
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*/
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ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
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cancel_delayed_work(&ctrl->button_work);
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if (ctrl->state == BLINKINGOFF_STATE) {
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ctrl->state = ON_STATE;
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pciehp_green_led_on(ctrl);
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} else {
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ctrl->state = OFF_STATE;
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pciehp_green_led_off(ctrl);
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}
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pciehp_set_attention_status(ctrl, 0);
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ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
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slot_name(ctrl));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
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slot_name(ctrl), ctrl->state);
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break;
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}
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mutex_unlock(&ctrl->state_lock);
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}
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void pciehp_handle_disable_request(struct controller *ctrl)
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{
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case BLINKINGON_STATE:
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case BLINKINGOFF_STATE:
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cancel_delayed_work(&ctrl->button_work);
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break;
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}
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ctrl->state = POWEROFF_STATE;
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mutex_unlock(&ctrl->state_lock);
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ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
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}
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void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
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{
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bool present, link_active;
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/*
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* If the slot is on and presence or link has changed, turn it off.
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* Even if it's occupied again, we cannot assume the card is the same.
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*/
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case BLINKINGOFF_STATE:
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cancel_delayed_work(&ctrl->button_work);
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/* fall through */
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case ON_STATE:
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ctrl->state = POWEROFF_STATE;
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mutex_unlock(&ctrl->state_lock);
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if (events & PCI_EXP_SLTSTA_DLLSC)
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ctrl_info(ctrl, "Slot(%s): Link Down\n",
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slot_name(ctrl));
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if (events & PCI_EXP_SLTSTA_PDC)
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ctrl_info(ctrl, "Slot(%s): Card not present\n",
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slot_name(ctrl));
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pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
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break;
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default:
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mutex_unlock(&ctrl->state_lock);
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break;
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}
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/* Turn the slot on if it's occupied or link is up */
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mutex_lock(&ctrl->state_lock);
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present = pciehp_card_present(ctrl);
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link_active = pciehp_check_link_active(ctrl);
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if (!present && !link_active) {
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mutex_unlock(&ctrl->state_lock);
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return;
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}
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switch (ctrl->state) {
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case BLINKINGON_STATE:
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cancel_delayed_work(&ctrl->button_work);
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/* fall through */
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case OFF_STATE:
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ctrl->state = POWERON_STATE;
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mutex_unlock(&ctrl->state_lock);
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if (present)
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ctrl_info(ctrl, "Slot(%s): Card present\n",
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slot_name(ctrl));
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if (link_active)
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ctrl_info(ctrl, "Slot(%s): Link Up\n",
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slot_name(ctrl));
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ctrl->request_result = pciehp_enable_slot(ctrl);
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break;
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default:
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mutex_unlock(&ctrl->state_lock);
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break;
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}
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}
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static int __pciehp_enable_slot(struct controller *ctrl)
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{
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u8 getstatus = 0;
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if (MRL_SENS(ctrl)) {
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pciehp_get_latch_status(ctrl, &getstatus);
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if (getstatus) {
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ctrl_info(ctrl, "Slot(%s): Latch open\n",
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slot_name(ctrl));
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return -ENODEV;
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}
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}
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if (POWER_CTRL(ctrl)) {
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pciehp_get_power_status(ctrl, &getstatus);
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if (getstatus) {
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ctrl_info(ctrl, "Slot(%s): Already enabled\n",
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slot_name(ctrl));
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return 0;
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}
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}
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return board_added(ctrl);
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}
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static int pciehp_enable_slot(struct controller *ctrl)
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{
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int ret;
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pm_runtime_get_sync(&ctrl->pcie->port->dev);
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ret = __pciehp_enable_slot(ctrl);
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if (ret && ATTN_BUTTN(ctrl))
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pciehp_green_led_off(ctrl); /* may be blinking */
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pm_runtime_put(&ctrl->pcie->port->dev);
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mutex_lock(&ctrl->state_lock);
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ctrl->state = ret ? OFF_STATE : ON_STATE;
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mutex_unlock(&ctrl->state_lock);
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return ret;
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}
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static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
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{
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u8 getstatus = 0;
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if (POWER_CTRL(ctrl)) {
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pciehp_get_power_status(ctrl, &getstatus);
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if (!getstatus) {
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ctrl_info(ctrl, "Slot(%s): Already disabled\n",
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slot_name(ctrl));
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return -EINVAL;
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}
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}
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remove_board(ctrl, safe_removal);
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return 0;
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}
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static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
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{
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int ret;
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pm_runtime_get_sync(&ctrl->pcie->port->dev);
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ret = __pciehp_disable_slot(ctrl, safe_removal);
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pm_runtime_put(&ctrl->pcie->port->dev);
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mutex_lock(&ctrl->state_lock);
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ctrl->state = OFF_STATE;
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mutex_unlock(&ctrl->state_lock);
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return ret;
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}
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int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct controller *ctrl = to_ctrl(hotplug_slot);
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case BLINKINGON_STATE:
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case OFF_STATE:
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mutex_unlock(&ctrl->state_lock);
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/*
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* The IRQ thread becomes a no-op if the user pulls out the
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* card before the thread wakes up, so initialize to -ENODEV.
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*/
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ctrl->request_result = -ENODEV;
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pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
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wait_event(ctrl->requester,
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!atomic_read(&ctrl->pending_events));
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return ctrl->request_result;
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case POWERON_STATE:
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ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
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slot_name(ctrl));
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break;
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case BLINKINGOFF_STATE:
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case ON_STATE:
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case POWEROFF_STATE:
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ctrl_info(ctrl, "Slot(%s): Already enabled\n",
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slot_name(ctrl));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
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slot_name(ctrl), ctrl->state);
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break;
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}
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mutex_unlock(&ctrl->state_lock);
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return -ENODEV;
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}
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int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct controller *ctrl = to_ctrl(hotplug_slot);
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mutex_lock(&ctrl->state_lock);
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switch (ctrl->state) {
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case BLINKINGOFF_STATE:
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case ON_STATE:
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mutex_unlock(&ctrl->state_lock);
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pciehp_request(ctrl, DISABLE_SLOT);
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wait_event(ctrl->requester,
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!atomic_read(&ctrl->pending_events));
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return ctrl->request_result;
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case POWEROFF_STATE:
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ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
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slot_name(ctrl));
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break;
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case BLINKINGON_STATE:
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case OFF_STATE:
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case POWERON_STATE:
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ctrl_info(ctrl, "Slot(%s): Already disabled\n",
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slot_name(ctrl));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
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slot_name(ctrl), ctrl->state);
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break;
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}
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mutex_unlock(&ctrl->state_lock);
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return -ENODEV;
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}
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