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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | // SPDX-License-Identifier: GPL-2.0-only /****************************************************************************** * platform-pci.c * * Xen platform PCI device driver * * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com * * Copyright (c) 2005, Intel Corporation. * Copyright (c) 2007, XenSource Inc. * Copyright (c) 2010, Citrix */ #include <linux/interrupt.h> #include <linux/io.h> #include <linux/init.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" static unsigned long platform_mmio; static unsigned long platform_mmio_alloc; static unsigned long platform_mmiolen; static uint64_t callback_via; static 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)HVM_PARAM_CALLBACK_TYPE_PCI_INTX << HVM_CALLBACK_VIA_TYPE_SHIFT) | ((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) { return xen_hvm_evtchn_do_upcall(); } static int xen_allocate_irq(struct pci_dev *pdev) { return request_irq(pdev->irq, do_hvm_evtchn_intr, IRQF_NOBALANCING | IRQF_SHARED, "xen-platform-pci", pdev); } static int platform_pci_resume(struct device *dev) { int err; if (xen_have_vector_callback) return 0; err = xen_set_callback_via(callback_via); if (err) { dev_err(dev, "platform_pci_resume failure!\n"); return err; } return 0; } static int platform_pci_probe(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; unsigned long grant_frames; if (!xen_domain()) return -ENODEV; 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; } /* * It doesn't strictly *have* to run on CPU0 but it sure * as hell better process the event channel ports delivered * to CPU0. */ irq_set_affinity(pdev->irq, cpumask_of(0)); 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 irq_out; } } max_nr_gframes = gnttab_max_grant_frames(); grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes); ret = gnttab_setup_auto_xlat_frames(grant_frames); if (ret) goto irq_out; ret = gnttab_init(); if (ret) goto grant_out; return 0; grant_out: gnttab_free_auto_xlat_frames(); irq_out: if (!xen_have_vector_callback) free_irq(pdev->irq, pdev); out: pci_release_region(pdev, 0); mem_out: pci_release_region(pdev, 1); pci_out: pci_disable_device(pdev); return ret; } static const struct pci_device_id platform_pci_tbl[] = { {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {0,} }; static const struct dev_pm_ops platform_pm_ops = { .resume_noirq = platform_pci_resume, }; static struct pci_driver platform_driver = { .name = DRV_NAME, .probe = platform_pci_probe, .id_table = platform_pci_tbl, .driver = { .pm = &platform_pm_ops, }, }; builtin_pci_driver(platform_driver); |