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113 lines
2.5 KiB
113 lines
2.5 KiB
// 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 <[email protected]>"); |
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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 pvpanic_instance *pi; |
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void __iomem *base; |
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int ret; |
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ret = pcim_enable_device(pdev); |
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if (ret < 0) |
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return ret; |
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base = pcim_iomap(pdev, 0, 0); |
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if (!base) |
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return -ENOMEM; |
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pi = devm_kmalloc(&pdev->dev, sizeof(*pi), GFP_KERNEL); |
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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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return devm_pvpanic_probe(&pdev->dev, pi); |
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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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.driver = { |
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.dev_groups = pvpanic_pci_dev_groups, |
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}, |
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}; |
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MODULE_DEVICE_TABLE(pci, pvpanic_pci_id_tbl); |
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module_pci_driver(pvpanic_pci_driver);
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