1 /****************************************************************************** 2 * platform-pci.c 3 * 4 * Xen platform PCI device driver 5 * 6 * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com 7 * 8 * Copyright (c) 2005, Intel Corporation. 9 * Copyright (c) 2007, XenSource Inc. 10 * Copyright (c) 2010, Citrix 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms and conditions of the GNU General Public License, 14 * version 2, as published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope it will be useful, but WITHOUT 17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 19 * more details. 20 * 21 * You should have received a copy of the GNU General Public License along with 22 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 23 * Place - Suite 330, Boston, MA 02111-1307 USA. 24 * 25 */ 26 27 28 #include <linux/interrupt.h> 29 #include <linux/io.h> 30 #include <linux/init.h> 31 #include <linux/pci.h> 32 33 #include <xen/platform_pci.h> 34 #include <xen/grant_table.h> 35 #include <xen/xenbus.h> 36 #include <xen/events.h> 37 #include <xen/hvm.h> 38 #include <xen/xen-ops.h> 39 40 #define DRV_NAME "xen-platform-pci" 41 42 static unsigned long platform_mmio; 43 static unsigned long platform_mmio_alloc; 44 static unsigned long platform_mmiolen; 45 static uint64_t callback_via; 46 47 static unsigned long alloc_xen_mmio(unsigned long len) 48 { 49 unsigned long addr; 50 51 addr = platform_mmio + platform_mmio_alloc; 52 platform_mmio_alloc += len; 53 BUG_ON(platform_mmio_alloc > platform_mmiolen); 54 55 return addr; 56 } 57 58 static uint64_t get_callback_via(struct pci_dev *pdev) 59 { 60 u8 pin; 61 int irq; 62 63 irq = pdev->irq; 64 if (irq < 16) 65 return irq; /* ISA IRQ */ 66 67 pin = pdev->pin; 68 69 /* We don't know the GSI. Specify the PCI INTx line instead. */ 70 return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */ 71 ((uint64_t)pci_domain_nr(pdev->bus) << 32) | 72 ((uint64_t)pdev->bus->number << 16) | 73 ((uint64_t)(pdev->devfn & 0xff) << 8) | 74 ((uint64_t)(pin - 1) & 3); 75 } 76 77 static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id) 78 { 79 xen_hvm_evtchn_do_upcall(); 80 return IRQ_HANDLED; 81 } 82 83 static int xen_allocate_irq(struct pci_dev *pdev) 84 { 85 return request_irq(pdev->irq, do_hvm_evtchn_intr, 86 IRQF_NOBALANCING | IRQF_TRIGGER_RISING, 87 "xen-platform-pci", pdev); 88 } 89 90 static int platform_pci_resume(struct pci_dev *pdev) 91 { 92 int err; 93 94 if (xen_have_vector_callback) 95 return 0; 96 97 err = xen_set_callback_via(callback_via); 98 if (err) { 99 dev_err(&pdev->dev, "platform_pci_resume failure!\n"); 100 return err; 101 } 102 return 0; 103 } 104 105 static int platform_pci_probe(struct pci_dev *pdev, 106 const struct pci_device_id *ent) 107 { 108 int i, ret; 109 long ioaddr; 110 long mmio_addr, mmio_len; 111 unsigned int max_nr_gframes; 112 unsigned long grant_frames; 113 114 if (!xen_domain()) 115 return -ENODEV; 116 117 i = pci_enable_device(pdev); 118 if (i) 119 return i; 120 121 ioaddr = pci_resource_start(pdev, 0); 122 123 mmio_addr = pci_resource_start(pdev, 1); 124 mmio_len = pci_resource_len(pdev, 1); 125 126 if (mmio_addr == 0 || ioaddr == 0) { 127 dev_err(&pdev->dev, "no resources found\n"); 128 ret = -ENOENT; 129 goto pci_out; 130 } 131 132 ret = pci_request_region(pdev, 1, DRV_NAME); 133 if (ret < 0) 134 goto pci_out; 135 136 ret = pci_request_region(pdev, 0, DRV_NAME); 137 if (ret < 0) 138 goto mem_out; 139 140 platform_mmio = mmio_addr; 141 platform_mmiolen = mmio_len; 142 if (!xen_have_vector_callback) { 143 ret = xen_allocate_irq(pdev); 144 if (ret) { 145 dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret); 146 goto out; 147 } 148 callback_via = get_callback_via(pdev); 149 ret = xen_set_callback_via(callback_via); 150 if (ret) { 151 dev_warn(&pdev->dev, "Unable to set the evtchn callback " 152 "err=%d\n", ret); 153 goto out; 154 } 155 } 156 157 max_nr_gframes = gnttab_max_grant_frames(); 158 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes); 159 ret = gnttab_setup_auto_xlat_frames(grant_frames); 160 if (ret) 161 goto out; 162 ret = gnttab_init(); 163 if (ret) 164 goto grant_out; 165 xenbus_probe(NULL); 166 return 0; 167 grant_out: 168 gnttab_free_auto_xlat_frames(); 169 out: 170 pci_release_region(pdev, 0); 171 mem_out: 172 pci_release_region(pdev, 1); 173 pci_out: 174 pci_disable_device(pdev); 175 return ret; 176 } 177 178 static const struct pci_device_id platform_pci_tbl[] = { 179 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM, 180 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 181 {0,} 182 }; 183 184 static struct pci_driver platform_driver = { 185 .name = DRV_NAME, 186 .probe = platform_pci_probe, 187 .id_table = platform_pci_tbl, 188 #ifdef CONFIG_PM 189 .resume_early = platform_pci_resume, 190 #endif 191 }; 192 193 builtin_pci_driver(platform_driver); 194