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-----BEGIN PGP SIGNATURE----- iQJIBAABCgAyFiEEgMe7l+5h9hnxdsnuWYigwDrT+vwFAl+QUFkUHGJoZWxnYWFz QGdvb2dsZS5jb20ACgkQWYigwDrT+vw6SQ/9FHiAlHIa48/l5ZweqAuN3XnU8hoO sqMoJE8eqTkIYIT0aQdW6b1sDB0YE6b4UVxzg+UL/E0qYeJqgIUakig7QkyyF1qU aT5hq2ic+lk88G7AAxK3kgQGPk+JvP1EFIyOu6HBWzzDDzgLme1Iuh/5ulc2/lo+ E4biy0WOnI8vMfCieXGK4bSpc17Rn0+3N4cuVwZXBlntsvicE90VqeWBzqti1sk5 R6gkZuW+EIUNHHL7TLlkCeYZq6QNbXWzhfKCiaGW2wW4eJ4Ek1/ncQjyTbCFytKU 7OIYvrH20XO3L5GEfJ5fdbWErI1dRpoHO4NmhWljyBcVh44VYnM2ixhA7TuJ+TOk OtMbtoJAlP+QDlVdAW6rmRYmMPLFK/AQl5Aq7ftY22b2rYXqP20BobPy2MpDT71T sGC8z0ABl/ijo23g3I+3/2VzP/RzGhZJ0ZqagrXj8jHtg8SVy2fLcR5nr/dlrgFk TG83zML6ui1KViyx5nzElaEtw18aTqP61CNQxijQtNoYwKBTtRKNTrdRr4Qo7Hi6 6S+No3+4z8Kf8d90y0LkJQqr7JRkG6nI3AhXHO3rxXpXJOD2+QzlpwBZTQnASqq7 3kC1doUPmN97rFUYPQWWyOs6xSMcGbGIz8Uus3shH6yDtNxgpnIVoctH55hTEh6w nSY/4ssIfzJxZCE= =RCFo -----END PGP SIGNATURE----- Merge tag 'pci-v5.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: "Enumeration: - Print IRQ number used by PCIe Link Bandwidth Notification (Dongdong Liu) - Add schedule point in pci_read_config() to reduce max latency (Jiang Biao) - Add Kconfig options for MPS/MRRS strategy (Jim Quinlan) Resource management: - Fix pci_iounmap() memory leak when !CONFIG_GENERIC_IOMAP (Lorenzo Pieralisi) PCIe native device hotplug: - Reduce noisiness on hot removal (Lukas Wunner) Power management: - Revert "PCI/PM: Apply D2 delay as milliseconds, not microseconds" that was done on the basis of spec typo (Bjorn Helgaas) - Rename pci_dev.d3_delay to d3hot_delay to remove D3hot/D3cold ambiguity (Krzysztof Wilczyński) - Remove unused pcibios_pm_ops (Vaibhav Gupta) IOMMU: - Enable Translation Blocking for external devices to harden against DMA attacks (Rajat Jain) Error handling: - Add an ACPI APEI notifier chain for vendor CPER records to enable device-specific error handling (Shiju Jose) ASPM: - Remove struct aspm_register_info to simplify code (Saheed O. Bolarinwa) Amlogic Meson PCIe controller driver: - Build as module by default (Kevin Hilman) Ampere Altra PCIe controller driver: - Add MCFG quirk to work around non-standard ECAM implementation (Tuan Phan) Broadcom iProc PCIe controller driver: - Set affinity mask on MSI interrupts (Mark Tomlinson) Broadcom STB PCIe controller driver: - Make PCIE_BRCMSTB depend on ARCH_BRCMSTB (Jim Quinlan) - Add DT bindings for more Brcmstb chips (Jim Quinlan) - Add bcm7278 register info (Jim Quinlan) - Add bcm7278 PERST# support (Jim Quinlan) - Add suspend and resume pm_ops (Jim Quinlan) - Add control of rescal reset (Jim Quinlan) - Set additional internal memory DMA viewport sizes (Jim Quinlan) - Accommodate MSI for older chips (Jim Quinlan) - Set bus max burst size by chip type (Jim Quinlan) - Add support for bcm7211, bcm7216, bcm7445, bcm7278 (Jim Quinlan) Freescale i.MX6 PCIe controller driver: - Use dev_err_probe() to reduce redundant messages (Anson Huang) Freescale Layerscape PCIe controller driver: - Enforce 4K DMA buffer alignment in endpoint test (Hou Zhiqiang) - Add DT compatible strings for ls1088a, ls2088a (Xiaowei Bao) - Add endpoint support for ls1088a, ls2088a (Xiaowei Bao) - Add endpoint test support for lS1088a (Xiaowei Bao) - Add MSI-X support for ls1088a (Xiaowei Bao) HiSilicon HIP PCIe controller driver: - Handle HIP-specific errors via ACPI APEI (Yicong Yang) HiSilicon Kirin PCIe controller driver: - Return -EPROBE_DEFER if the GPIO isn't ready (Bean Huo) Intel VMD host bridge driver: - Factor out physical offset, bus offset, IRQ domain, IRQ allocation (Jon Derrick) - Use generic PCI PM correctly (Jon Derrick) Marvell Aardvark PCIe controller driver: - Fix compilation on s390 (Pali Rohár) - Implement driver 'remove' function and allow to build it as module (Pali Rohár) - Move PCIe reset card code to advk_pcie_train_link() (Pali Rohár) - Convert mvebu a3700 internal SMCC firmware return codes to errno (Pali Rohár) - Fix initialization with old Marvell's Arm Trusted Firmware (Pali Rohár) Microsoft Hyper-V host bridge driver: - Fix hibernation in case interrupts are not re-created (Dexuan Cui) NVIDIA Tegra PCIe controller driver: - Stop checking return value of debugfs_create() functions (Greg Kroah-Hartman) - Convert to use DEFINE_SEQ_ATTRIBUTE macro (Liu Shixin) Qualcomm PCIe controller driver: - Reset PCIe to work around Qsdk U-Boot issue (Ansuel Smith) Renesas R-Car PCIe controller driver: - Add DT documentation for r8a774a1, r8a774b1, r8a774e1 endpoints (Lad Prabhakar) - Add RZ/G2M, RZ/G2N, RZ/G2H IDs to endpoint test (Lad Prabhakar) - Add DT support for r8a7742 (Lad Prabhakar) Socionext UniPhier Pro5 controller driver: - Add DT descriptions of iATU register (host and endpoint) (Kunihiko Hayashi) Synopsys DesignWare PCIe controller driver: - Add link up check in dw_child_pcie_ops.map_bus() (racy, but seems unavoidable) (Hou Zhiqiang) - Fix endpoint Header Type check so multi-function devices work (Hou Zhiqiang) - Skip PCIE_MSI_INTR0* programming if MSI is disabled (Jisheng Zhang) - Stop leaking MSI page in suspend/resume (Jisheng Zhang) - Add common iATU register support instead of keystone-specific code (Kunihiko Hayashi) - Major config space access and other cleanups in dwc core and drivers that use it (al, exynos, histb, imx6, intel-gw, keystone, kirin, meson, qcom, tegra) (Rob Herring) - Add multiple PFs support for endpoint (Xiaowei Bao) - Add MSI-X doorbell mode in endpoint mode (Xiaowei Bao) Miscellaneous: - Use fallthrough pseudo-keyword (Gustavo A. R. Silva) - Fix "0 used as NULL pointer" warnings (Gustavo Pimentel) - Fix "cast truncates bits from constant value" warnings (Gustavo Pimentel) - Remove redundant zeroing for sg_init_table() (Julia Lawall) - Use scnprintf(), not snprintf(), in sysfs "show" functions (Krzysztof Wilczyński) - Remove unused assignments (Krzysztof Wilczyński) - Fix "0 used as NULL pointer" warning (Krzysztof Wilczyński) - Simplify bool comparisons (Krzysztof Wilczyński) - Use for_each_child_of_node() and for_each_node_by_name() (Qinglang Miao) - Simplify return expressions (Qinglang Miao)" * tag 'pci-v5.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (147 commits) PCI: vmd: Update VMD PM to correctly use generic PCI PM PCI: vmd: Create IRQ allocation helper PCI: vmd: Create IRQ Domain configuration helper PCI: vmd: Create bus offset configuration helper PCI: vmd: Create physical offset helper PCI: v3-semi: Remove unneeded break PCI: dwc: Add link up check in dw_child_pcie_ops.map_bus() PCI/ASPM: Remove struct pcie_link_state.l1ss PCI/ASPM: Remove struct aspm_register_info.l1ss_cap PCI/ASPM: Pass L1SS Capabilities value, not struct aspm_register_info PCI/ASPM: Remove struct aspm_register_info.l1ss_ctl1 PCI/ASPM: Remove struct aspm_register_info.l1ss_ctl2 (unused) PCI/ASPM: Remove struct aspm_register_info.l1ss_cap_ptr PCI/ASPM: Remove struct aspm_register_info.latency_encoding PCI/ASPM: Remove struct aspm_register_info.enabled PCI/ASPM: Remove struct aspm_register_info.support PCI/ASPM: Use 'parent' and 'child' for readability PCI/ASPM: Move LTR path check to where it's used PCI/ASPM: Move pci_clear_and_set_dword() earlier PCI: dwc: Fix MSI page leakage in suspend/resume ...
431 lines
11 KiB
C
431 lines
11 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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/*
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* Turn off slot, turn on attention indicator, turn off power
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* indicator
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*/
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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_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
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PCI_EXP_SLTCTL_ATTN_IND_ON);
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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_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
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INDICATOR_NOOP);
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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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goto err_exit;
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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_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
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PCI_EXP_SLTCTL_ATTN_IND_OFF);
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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 - Turn off slot and Power Indicator
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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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pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
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INDICATOR_NOOP);
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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 power indicator and turn off attention */
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pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
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PCI_EXP_SLTCTL_ATTN_IND_OFF);
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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_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
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PCI_EXP_SLTCTL_ATTN_IND_OFF);
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} else {
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ctrl->state = OFF_STATE;
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pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
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PCI_EXP_SLTCTL_ATTN_IND_OFF);
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}
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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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int 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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fallthrough;
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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 <= 0 && link_active <= 0) {
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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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fallthrough;
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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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/* may be blinking */
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pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
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INDICATOR_NOOP);
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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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct controller *ctrl = to_ctrl(hotplug_slot);
|
|
|
|
mutex_lock(&ctrl->state_lock);
|
|
switch (ctrl->state) {
|
|
case BLINKINGON_STATE:
|
|
case OFF_STATE:
|
|
mutex_unlock(&ctrl->state_lock);
|
|
/*
|
|
* The IRQ thread becomes a no-op if the user pulls out the
|
|
* card before the thread wakes up, so initialize to -ENODEV.
|
|
*/
|
|
ctrl->request_result = -ENODEV;
|
|
pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
|
|
wait_event(ctrl->requester,
|
|
!atomic_read(&ctrl->pending_events) &&
|
|
!ctrl->ist_running);
|
|
return ctrl->request_result;
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
|
|
slot_name(ctrl));
|
|
break;
|
|
case BLINKINGOFF_STATE:
|
|
case ON_STATE:
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already enabled\n",
|
|
slot_name(ctrl));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
|
|
slot_name(ctrl), ctrl->state);
|
|
break;
|
|
}
|
|
mutex_unlock(&ctrl->state_lock);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct controller *ctrl = to_ctrl(hotplug_slot);
|
|
|
|
mutex_lock(&ctrl->state_lock);
|
|
switch (ctrl->state) {
|
|
case BLINKINGOFF_STATE:
|
|
case ON_STATE:
|
|
mutex_unlock(&ctrl->state_lock);
|
|
pciehp_request(ctrl, DISABLE_SLOT);
|
|
wait_event(ctrl->requester,
|
|
!atomic_read(&ctrl->pending_events) &&
|
|
!ctrl->ist_running);
|
|
return ctrl->request_result;
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
|
|
slot_name(ctrl));
|
|
break;
|
|
case BLINKINGON_STATE:
|
|
case OFF_STATE:
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already disabled\n",
|
|
slot_name(ctrl));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
|
|
slot_name(ctrl), ctrl->state);
|
|
break;
|
|
}
|
|
mutex_unlock(&ctrl->state_lock);
|
|
|
|
return -ENODEV;
|
|
}
|