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db3a4f0abe
Add support for pvpanic PCI device added in qemu [1]. At probe time, obtain the
address where to read/write pvpanic events and pass it to the generic handling
code. Will follow the same logic as pvpanic MMIO device driver. At remove time,
unmap base address and disable PCI device.
[1] 9df52f58e7
Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
Link: https://lore.kernel.org/r/1616597356-20696-4-git-send-email-mihai.carabas@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Pvpanic PCI Device Support
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*
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* Copyright (C) 2021 Oracle.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <uapi/misc/pvpanic.h>
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#include "pvpanic.h"
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#define PCI_VENDOR_ID_REDHAT 0x1b36
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#define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0011
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MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
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MODULE_DESCRIPTION("pvpanic device driver ");
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MODULE_LICENSE("GPL");
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static const struct pci_device_id pvpanic_pci_id_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)},
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{}
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};
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static ssize_t capability_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%x\n", pi->capability);
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}
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static DEVICE_ATTR_RO(capability);
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static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%x\n", pi->events);
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}
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static ssize_t events_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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unsigned int tmp;
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int err;
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err = kstrtouint(buf, 16, &tmp);
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if (err)
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return err;
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if ((tmp & pi->capability) != tmp)
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return -EINVAL;
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pi->events = tmp;
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return count;
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}
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static DEVICE_ATTR_RW(events);
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static struct attribute *pvpanic_pci_dev_attrs[] = {
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&dev_attr_capability.attr,
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&dev_attr_events.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(pvpanic_pci_dev);
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static int pvpanic_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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struct device *dev = &pdev->dev;
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struct pvpanic_instance *pi;
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void __iomem *base;
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int ret;
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ret = pci_enable_device(pdev);
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if (ret < 0)
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return ret;
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base = pci_iomap(pdev, 0, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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pi = kmalloc(sizeof(*pi), GFP_ATOMIC);
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if (!pi)
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return -ENOMEM;
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pi->base = base;
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pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
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/* initlize capability by RDPT */
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pi->capability &= ioread8(base);
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pi->events = pi->capability;
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dev_set_drvdata(dev, pi);
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return pvpanic_probe(pi);
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}
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static void pvpanic_pci_remove(struct pci_dev *pdev)
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{
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struct pvpanic_instance *pi = dev_get_drvdata(&pdev->dev);
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pvpanic_remove(pi);
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iounmap(pi->base);
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kfree(pi);
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pci_disable_device(pdev);
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}
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static struct pci_driver pvpanic_pci_driver = {
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.name = "pvpanic-pci",
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.id_table = pvpanic_pci_id_tbl,
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.probe = pvpanic_pci_probe,
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.remove = pvpanic_pci_remove,
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.driver = {
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.dev_groups = pvpanic_pci_dev_groups,
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},
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};
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module_pci_driver(pvpanic_pci_driver);
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