242 lines
5.9 KiB
C
242 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* UIO driver for Inter-VM shared memory PCI device
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*
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* Copyright (c) Siemens AG, 2019
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*
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* Authors:
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* Jan Kiszka <jan.kiszka@siemens.com>
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*/
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#include <linux/ivshmem.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/uio_driver.h>
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#define DRV_NAME "uio_ivshmem"
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struct ivshm_dev {
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struct uio_info info;
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struct pci_dev *pdev;
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struct ivshm_regs __iomem *regs;
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int vectors;
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};
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static irqreturn_t ivshm_irq_handler(int irq, void *dev_id)
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{
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struct ivshm_dev *ivshm_dev = (struct ivshm_dev *)dev_id;
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/* nothing else to do, we configured one-shot interrupt mode */
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uio_event_notify(&ivshm_dev->info);
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return IRQ_HANDLED;
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}
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static u64 get_config_qword(struct pci_dev *pdev, unsigned int pos)
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{
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u32 lo, hi;
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pci_read_config_dword(pdev, pos, &lo);
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pci_read_config_dword(pdev, pos + 4, &hi);
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return lo | ((u64)hi << 32);
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}
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static int ivshm_release(struct uio_info *info, struct inode *inode)
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{
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struct ivshm_dev *ivshm_dev =
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container_of(info, struct ivshm_dev, info);
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writel(0, &ivshm_dev->regs->state);
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return 0;
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}
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static int ivshm_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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resource_size_t rw_section_sz, output_section_sz;
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struct ivshm_dev *ivshm_dev;
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phys_addr_t section_addr;
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int err, vendor_cap, i;
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unsigned int cap_pos;
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struct uio_mem *mem;
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char *device_name;
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u32 dword;
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ivshm_dev = devm_kzalloc(&pdev->dev, sizeof(struct ivshm_dev),
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GFP_KERNEL);
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if (!ivshm_dev)
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return -ENOMEM;
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err = pcim_enable_device(pdev);
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if (err)
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return err;
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device_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s[%s]", DRV_NAME,
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dev_name(&pdev->dev));
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if (!device_name)
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return -ENOMEM;
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ivshm_dev->info.name = device_name;
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ivshm_dev->info.version = "1";
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ivshm_dev->info.release = ivshm_release;
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err = pcim_iomap_regions(pdev, BIT(0), device_name);
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if (err)
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return err;
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ivshm_dev->regs = pcim_iomap_table(pdev)[0];
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mem = &ivshm_dev->info.mem[0];
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mem->name = "registers";
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mem->addr = pci_resource_start(pdev, 0);
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if (!mem->addr)
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return -ENODEV;
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mem->size = pci_resource_len(pdev, 0);
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mem->memtype = UIO_MEM_PHYS;
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vendor_cap = pci_find_capability(pdev, PCI_CAP_ID_VNDR);
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if (vendor_cap < 0)
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return -ENODEV;
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if (pci_resource_len(pdev, 2) > 0) {
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section_addr = pci_resource_start(pdev, 2);
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} else {
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cap_pos = vendor_cap + IVSHM_CFG_ADDRESS;
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section_addr = get_config_qword(pdev, cap_pos);
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}
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mem++;
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mem->name = "state_table";
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mem->addr = section_addr;
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cap_pos = vendor_cap + IVSHM_CFG_STATE_TAB_SZ;
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pci_read_config_dword(pdev, cap_pos, &dword);
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mem->size = dword;
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mem->memtype = UIO_MEM_IOVA;
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mem->readonly = true;
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if (!devm_request_mem_region(&pdev->dev, mem->addr, mem->size,
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device_name))
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return -EBUSY;
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dev_info(&pdev->dev, "%s at %pa, size %pa\n", mem->name, &mem->addr,
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&mem->size);
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cap_pos = vendor_cap + IVSHM_CFG_RW_SECTION_SZ;
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rw_section_sz = get_config_qword(pdev, cap_pos);
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if (rw_section_sz > 0) {
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section_addr += mem->size;
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mem++;
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mem->name = "rw_section";
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mem->addr = section_addr;
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mem->size = rw_section_sz;
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mem->memtype = UIO_MEM_IOVA;
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if (!devm_request_mem_region(&pdev->dev, mem->addr, mem->size,
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device_name))
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return -EBUSY;
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dev_info(&pdev->dev, "%s at %pa, size %pa\n", mem->name,
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&mem->addr, &mem->size);
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}
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cap_pos = vendor_cap + IVSHM_CFG_OUTPUT_SECTION_SZ;
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output_section_sz = get_config_qword(pdev, cap_pos);
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if (output_section_sz > 0) {
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section_addr += mem->size;
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mem++;
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mem->name = "input_sections";
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mem->addr = section_addr;
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mem->size =
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readl(&ivshm_dev->regs->max_peers) * output_section_sz;
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mem->memtype = UIO_MEM_IOVA;
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mem->readonly = true;
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if (!devm_request_mem_region(&pdev->dev, mem->addr, mem->size,
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device_name))
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return -EBUSY;
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dev_info(&pdev->dev, "%s at %pa, size %pa\n", mem->name,
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&mem->addr, &mem->size);
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mem++;
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mem->name = "output_section";
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mem->addr = section_addr +
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readl(&ivshm_dev->regs->id) * output_section_sz;
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mem->size = output_section_sz;
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mem->memtype = UIO_MEM_IOVA;
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dev_info(&pdev->dev, "%s at %pa, size %pa\n", mem->name,
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&mem->addr, &mem->size);
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}
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pci_write_config_byte(pdev, vendor_cap + IVSHM_CFG_PRIV_CNTL,
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IVSHM_PRIV_CNTL_ONESHOT_INT);
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/*
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* Grab all vectors although we can only coalesce them into a single
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* notifier. This avoids missing any event.
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*/
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ivshm_dev->vectors = pci_msix_vec_count(pdev);
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if (ivshm_dev->vectors < 0)
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ivshm_dev->vectors = 1;
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err = pci_alloc_irq_vectors(pdev, ivshm_dev->vectors,
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ivshm_dev->vectors,
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PCI_IRQ_LEGACY | PCI_IRQ_MSIX);
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if (err < 0)
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return err;
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for (i = 0; i < ivshm_dev->vectors; i++) {
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err = request_irq(pci_irq_vector(pdev, i), ivshm_irq_handler,
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IRQF_SHARED, ivshm_dev->info.name, ivshm_dev);
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if (err)
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goto error;
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}
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ivshm_dev->info.irq = UIO_IRQ_CUSTOM;
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err = uio_register_device(&pdev->dev, &ivshm_dev->info);
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if (err)
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goto error;
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pci_set_master(pdev);
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pci_set_drvdata(pdev, ivshm_dev);
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return 0;
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error:
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while (--i > 0)
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free_irq(pci_irq_vector(pdev, i), ivshm_dev);
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pci_free_irq_vectors(pdev);
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return err;
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}
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static void ivshm_remove(struct pci_dev *pdev)
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{
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struct ivshm_dev *ivshm_dev = pci_get_drvdata(pdev);
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int i;
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writel(0, &ivshm_dev->regs->int_control);
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pci_clear_master(pdev);
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uio_unregister_device(&ivshm_dev->info);
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for (i = 0; i < ivshm_dev->vectors; i++)
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free_irq(pci_irq_vector(pdev, i), ivshm_dev);
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pci_free_irq_vectors(pdev);
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}
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static const struct pci_device_id ivshm_device_id_table[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_SIEMENS, PCI_DEVICE_ID_IVSHMEM),
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(PCI_CLASS_OTHERS << 16) | IVSHM_PROTO_UNDEFINED, 0xffffff },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, ivshm_device_id_table);
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static struct pci_driver uio_ivshm_driver = {
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.name = DRV_NAME,
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.id_table = ivshm_device_id_table,
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.probe = ivshm_probe,
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.remove = ivshm_remove,
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};
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module_pci_driver(uio_ivshm_driver);
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MODULE_AUTHOR("Jan Kiszka <jan.kiszka@siemens.com>");
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MODULE_LICENSE("GPL v2");
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