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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | /****************************************************************************** * platform-pci.c * * Xen platform PCI device driver * Copyright (c) 2005, Intel Corporation. * Copyright (c) 2007, XenSource Inc. * Copyright (c) 2010, Citrix * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. * */ #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pci.h> #include <xen/platform_pci.h> #include <xen/grant_table.h> #include <xen/xenbus.h> #include <xen/events.h> #include <xen/hvm.h> #include <xen/xen-ops.h> #define DRV_NAME "xen-platform-pci" MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com"); MODULE_DESCRIPTION("Xen platform PCI device"); MODULE_LICENSE("GPL"); static unsigned long platform_mmio; static unsigned long platform_mmio_alloc; static unsigned long platform_mmiolen; static uint64_t callback_via; unsigned long alloc_xen_mmio(unsigned long len) { unsigned long addr; addr = platform_mmio + platform_mmio_alloc; platform_mmio_alloc += len; BUG_ON(platform_mmio_alloc > platform_mmiolen); return addr; } static uint64_t get_callback_via(struct pci_dev *pdev) { u8 pin; int irq; irq = pdev->irq; if (irq < 16) return irq; /* ISA IRQ */ pin = pdev->pin; /* We don't know the GSI. Specify the PCI INTx line instead. */ return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */ ((uint64_t)pci_domain_nr(pdev->bus) << 32) | ((uint64_t)pdev->bus->number << 16) | ((uint64_t)(pdev->devfn & 0xff) << 8) | ((uint64_t)(pin - 1) & 3); } static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id) { xen_hvm_evtchn_do_upcall(); return IRQ_HANDLED; } static int xen_allocate_irq(struct pci_dev *pdev) { return request_irq(pdev->irq, do_hvm_evtchn_intr, IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING, "xen-platform-pci", pdev); } static int platform_pci_resume(struct pci_dev *pdev) { int err; if (xen_have_vector_callback) return 0; err = xen_set_callback_via(callback_via); if (err) { dev_err(&pdev->dev, "platform_pci_resume failure!\n"); return err; } return 0; } static int __devinit platform_pci_init(struct pci_dev *pdev, const struct pci_device_id *ent) { int i, ret; long ioaddr; long mmio_addr, mmio_len; unsigned int max_nr_gframes; i = pci_enable_device(pdev); if (i) return i; ioaddr = pci_resource_start(pdev, 0); mmio_addr = pci_resource_start(pdev, 1); mmio_len = pci_resource_len(pdev, 1); if (mmio_addr == 0 || ioaddr == 0) { dev_err(&pdev->dev, "no resources found\n"); ret = -ENOENT; goto pci_out; } ret = pci_request_region(pdev, 1, DRV_NAME); if (ret < 0) goto pci_out; ret = pci_request_region(pdev, 0, DRV_NAME); if (ret < 0) goto mem_out; platform_mmio = mmio_addr; platform_mmiolen = mmio_len; if (!xen_have_vector_callback) { ret = xen_allocate_irq(pdev); if (ret) { dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret); goto out; } callback_via = get_callback_via(pdev); ret = xen_set_callback_via(callback_via); if (ret) { dev_warn(&pdev->dev, "Unable to set the evtchn callback " "err=%d\n", ret); goto out; } } max_nr_gframes = gnttab_max_grant_frames(); xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes); ret = gnttab_init(); if (ret) goto out; xenbus_probe(NULL); return 0; out: pci_release_region(pdev, 0); mem_out: pci_release_region(pdev, 1); pci_out: pci_disable_device(pdev); return ret; } static struct pci_device_id platform_pci_tbl[] __devinitdata = { {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {0,} }; MODULE_DEVICE_TABLE(pci, platform_pci_tbl); static struct pci_driver platform_driver = { .name = DRV_NAME, .probe = platform_pci_init, .id_table = platform_pci_tbl, #ifdef CONFIG_PM .resume_early = platform_pci_resume, #endif }; static int __init platform_pci_module_init(void) { return pci_register_driver(&platform_driver); } module_init(platform_pci_module_init); |