2 * Jailhouse, a Linux-based partitioning hypervisor
4 * Copyright (c) Siemens AG, 2014
7 * Ivan Kolchin <ivan.kolchin@siemens.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
13 #include <jailhouse/acpi.h>
14 #include <jailhouse/mmio.h>
15 #include <jailhouse/pci.h>
16 #include <jailhouse/printk.h>
17 #include <jailhouse/utils.h>
19 struct acpi_mcfg_alloc {
25 } __attribute__((packed));
27 struct acpi_mcfg_table {
28 struct acpi_table_header header;
30 struct acpi_mcfg_alloc alloc_structs[];
31 } __attribute__((packed));
33 /* entry for PCI config space whitelist (granting access) */
34 struct pci_cfg_access {
35 u32 reg_num; /** Register number (4-byte aligned) */
36 u32 mask; /** Bit set: access allowed */
39 /* --- Whilelist for writing to PCI config space registers --- */
40 /* Type 1: Endpoints */
41 static const struct pci_cfg_access endpoint_write_access[] = {
42 { 0x04, 0xffffffff }, /* Command, Status */
43 { 0x0c, 0xff000000 }, /* BIST */
44 { 0x3c, 0x000000ff }, /* Int Line */
47 static const struct pci_cfg_access bridge_write_access[] = {
48 { 0x04, 0xffffffff }, /* Command, Status */
49 { 0x0c, 0xff000000 }, /* BIST */
50 { 0x3c, 0xffff00ff }, /* Int Line, Bridge Control */
53 static void *pci_space;
54 static u64 pci_mmcfg_addr;
55 static u32 pci_mmcfg_size;
58 * pci_get_assigned_device() - Look up device owned by a cell
60 * @bdf: 16-bit bus/device/function ID
62 * Return: Valid pointer - owns, NULL - doesn't own.
64 const struct jailhouse_pci_device *
65 pci_get_assigned_device(const struct cell *cell, u16 bdf)
67 const struct jailhouse_pci_device *device =
68 jailhouse_cell_pci_devices(cell->config);
71 for (n = 0; n < cell->config->num_pci_devices; n++)
72 if (((device[n].bus << 8) | device[n].devfn) == bdf)
79 * pci_cfg_write_allowed() - Check general config space write permission
80 * @type: JAILHOUSE_PCI_TYPE_DEVICE or JAILHOUSE_PCI_TYPE_BRIDGE
81 * @reg_num: Register number (4-byte aligned)
82 * @bias: Bias from register base address in bytes
83 * @size: Access size (1, 2 or 4 bytes)
85 * Return: True if writing is allowed, false otherwise.
87 bool pci_cfg_write_allowed(u32 type, u8 reg_num, unsigned int reg_bias,
90 /* initialize list to work around wrong compiler warning */
91 const struct pci_cfg_access *list = NULL;
92 unsigned int n, len = 0;
94 if (type == JAILHOUSE_PCI_TYPE_DEVICE) {
95 list = endpoint_write_access;
96 len = ARRAY_SIZE(endpoint_write_access);
97 } else if (type == JAILHOUSE_PCI_TYPE_BRIDGE) {
98 list = bridge_write_access;
99 len = ARRAY_SIZE(bridge_write_access);
102 for (n = 0; n < len; n++)
103 if (list[n].reg_num == reg_num)
104 return ((list[n].mask >> (reg_bias * 8)) &
105 BYTE_MASK(size)) == BYTE_MASK(size);
111 * pci_init() - Initialization of PCI module
113 * Return: 0 - success, error code - if error.
117 struct acpi_mcfg_table *mcfg;
119 mcfg = (struct acpi_mcfg_table *)acpi_find_table("MCFG", NULL);
123 if (mcfg->header.length !=
124 sizeof(struct acpi_mcfg_table) + sizeof(struct acpi_mcfg_alloc))
127 pci_mmcfg_addr = mcfg->alloc_structs[0].base_addr;
128 pci_mmcfg_size = (mcfg->alloc_structs[0].end_bus -
129 mcfg->alloc_structs[0].start_bus) * 256 * 4096;
130 pci_space = page_alloc(&remap_pool, pci_mmcfg_size / PAGE_SIZE);
132 page_map_create(&hv_paging_structs,
133 mcfg->alloc_structs[0].base_addr,
134 pci_mmcfg_size, (unsigned long)pci_space,
135 PAGE_DEFAULT_FLAGS | PAGE_FLAG_UNCACHED,
136 PAGE_MAP_NON_COHERENT);
142 * pci_mmio_access_handler() - Handler for MMIO-accesses to PCI config space
143 * @cell: Request issuing cell
144 * @is_write: True if write access
145 * @addr: Address accessed
146 * @value: Pointer to value for reading/writing
148 * Return: 1 if handled successfully, 0 if unhandled, -1 on access error
150 int pci_mmio_access_handler(const struct cell *cell, bool is_write,
151 u64 addr, u32 *value)
153 const struct jailhouse_pci_device *device;
158 if (addr < pci_mmcfg_addr ||
159 addr >= (pci_mmcfg_addr + pci_mmcfg_size - 4))
162 mmcfg_offset = addr - pci_mmcfg_addr;
163 reg_bias = mmcfg_offset % 4;
164 reg_num = mmcfg_offset & 0xfff;
165 device = pci_get_assigned_device(cell, mmcfg_offset >> 12);
170 if (reg_num < PCI_CONFIG_HEADER_SIZE) {
171 if (!pci_cfg_write_allowed(device->type,
176 // TODO: moderate capability access
179 mmio_write32(pci_space + mmcfg_offset, *value);
182 *value = mmio_read32(pci_space + mmcfg_offset);
189 panic_printk("FATAL: Invalid PCI MMCONFIG write, device %02x:%02x.%x, "
190 "reg: %\n", mmcfg_offset >> 20, (mmcfg_offset >> 15) & 31,
191 (mmcfg_offset >> 12) & 7, reg_num);