1 /* 2 * Copyright (c) 2015, Linaro Limited, Shannon Zhao 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <linux/platform_device.h> 18 #include <linux/acpi.h> 19 #include <xen/xen.h> 20 #include <xen/page.h> 21 #include <xen/interface/memory.h> 22 #include <asm/xen/hypervisor.h> 23 #include <asm/xen/hypercall.h> 24 25 static int xen_unmap_device_mmio(const struct resource *resources, 26 unsigned int count) 27 { 28 unsigned int i, j, nr; 29 int rc = 0; 30 const struct resource *r; 31 struct xen_remove_from_physmap xrp; 32 33 for (i = 0; i < count; i++) { 34 r = &resources[i]; 35 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE); 36 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0)) 37 continue; 38 39 for (j = 0; j < nr; j++) { 40 xrp.domid = DOMID_SELF; 41 xrp.gpfn = XEN_PFN_DOWN(r->start) + j; 42 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, 43 &xrp); 44 if (rc) 45 return rc; 46 } 47 } 48 49 return rc; 50 } 51 52 static int xen_map_device_mmio(const struct resource *resources, 53 unsigned int count) 54 { 55 unsigned int i, j, nr; 56 int rc = 0; 57 const struct resource *r; 58 xen_pfn_t *gpfns; 59 xen_ulong_t *idxs; 60 int *errs; 61 struct xen_add_to_physmap_range xatp; 62 63 for (i = 0; i < count; i++) { 64 r = &resources[i]; 65 nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE); 66 if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0)) 67 continue; 68 69 gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL); 70 idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL); 71 errs = kzalloc(sizeof(int) * nr, GFP_KERNEL); 72 if (!gpfns || !idxs || !errs) { 73 kfree(gpfns); 74 kfree(idxs); 75 kfree(errs); 76 rc = -ENOMEM; 77 goto unmap; 78 } 79 80 for (j = 0; j < nr; j++) { 81 /* 82 * The regions are always mapped 1:1 to DOM0 and this is 83 * fine because the memory map for DOM0 is the same as 84 * the host (except for the RAM). 85 */ 86 gpfns[j] = XEN_PFN_DOWN(r->start) + j; 87 idxs[j] = XEN_PFN_DOWN(r->start) + j; 88 } 89 90 xatp.domid = DOMID_SELF; 91 xatp.size = nr; 92 xatp.space = XENMAPSPACE_dev_mmio; 93 94 set_xen_guest_handle(xatp.gpfns, gpfns); 95 set_xen_guest_handle(xatp.idxs, idxs); 96 set_xen_guest_handle(xatp.errs, errs); 97 98 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp); 99 kfree(gpfns); 100 kfree(idxs); 101 kfree(errs); 102 if (rc) 103 goto unmap; 104 } 105 106 return rc; 107 108 unmap: 109 xen_unmap_device_mmio(resources, i); 110 return rc; 111 } 112 113 static int xen_platform_notifier(struct notifier_block *nb, 114 unsigned long action, void *data) 115 { 116 struct platform_device *pdev = to_platform_device(data); 117 int r = 0; 118 119 if (pdev->num_resources == 0 || pdev->resource == NULL) 120 return NOTIFY_OK; 121 122 switch (action) { 123 case BUS_NOTIFY_ADD_DEVICE: 124 r = xen_map_device_mmio(pdev->resource, pdev->num_resources); 125 break; 126 case BUS_NOTIFY_DEL_DEVICE: 127 r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources); 128 break; 129 default: 130 return NOTIFY_DONE; 131 } 132 if (r) 133 dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n", 134 action == BUS_NOTIFY_ADD_DEVICE ? "map" : 135 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"), 136 pdev->name); 137 138 return NOTIFY_OK; 139 } 140 141 static struct notifier_block platform_device_nb = { 142 .notifier_call = xen_platform_notifier, 143 }; 144 145 static int __init register_xen_platform_notifier(void) 146 { 147 if (!xen_initial_domain() || acpi_disabled) 148 return 0; 149 150 return bus_register_notifier(&platform_bus_type, &platform_device_nb); 151 } 152 153 arch_initcall(register_xen_platform_notifier); 154 155 #ifdef CONFIG_ARM_AMBA 156 #include <linux/amba/bus.h> 157 158 static int xen_amba_notifier(struct notifier_block *nb, 159 unsigned long action, void *data) 160 { 161 struct amba_device *adev = to_amba_device(data); 162 int r = 0; 163 164 switch (action) { 165 case BUS_NOTIFY_ADD_DEVICE: 166 r = xen_map_device_mmio(&adev->res, 1); 167 break; 168 case BUS_NOTIFY_DEL_DEVICE: 169 r = xen_unmap_device_mmio(&adev->res, 1); 170 break; 171 default: 172 return NOTIFY_DONE; 173 } 174 if (r) 175 dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n", 176 action == BUS_NOTIFY_ADD_DEVICE ? "map" : 177 (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"), 178 adev->dev.init_name); 179 180 return NOTIFY_OK; 181 } 182 183 static struct notifier_block amba_device_nb = { 184 .notifier_call = xen_amba_notifier, 185 }; 186 187 static int __init register_xen_amba_notifier(void) 188 { 189 if (!xen_initial_domain() || acpi_disabled) 190 return 0; 191 192 return bus_register_notifier(&amba_bustype, &amba_device_nb); 193 } 194 195 arch_initcall(register_xen_amba_notifier); 196 #endif 197