hw/pci/pci_host.c - qemu - Git at Google

 /*
  * pci_host.c
  *
  * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
  *                    VA Linux Systems Japan K.K.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.

  * This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_bridge.h"
 #include "hw/pci/pci_host.h"
 #include "hw/qdev-properties.h"
 #include "qemu/module.h"
 #include "hw/pci/pci_bus.h"
 #include "migration/vmstate.h"
 #include "trace.h"

 /* debug PCI */
 //#define DEBUG_PCI

 #ifdef DEBUG_PCI
 #define PCI_DPRINTF(fmt, ...) \
 do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
 #else
 #define PCI_DPRINTF(fmt, ...)
 #endif

 /*
  * PCI address
  * bit 16 - 24: bus number
  * bit  8 - 15: devfun number
  * bit  0 -  7: offset in configuration space of a given pci device
  */

 /* the helper function to get a PCIDevice* for a given pci address */
 static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
 {
     uint8_t bus_num = addr >> 16;
     uint8_t devfn = addr >> 8;

     return pci_find_device(bus, bus_num, devfn);
 }

 static void pci_adjust_config_limit(PCIBus *bus, uint32_t *limit)
 {
     if ((*limit > PCI_CONFIG_SPACE_SIZE) &&
         !pci_bus_allows_extended_config_space(bus)) {
         *limit = PCI_CONFIG_SPACE_SIZE;
     }
 }

 static bool is_pci_dev_ejected(PCIDevice *pci_dev)
 {
     /*
      * device unplug was requested and the guest acked it,
      * so we stop responding config accesses even if the
      * device is not deleted (failover flow)
      */
     return pci_dev && pci_dev->partially_hotplugged &&
            !pci_dev->qdev.pending_deleted_event;
 }

 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
                                   uint32_t limit, uint32_t val, uint32_t len)
 {
     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
     if (limit <= addr) {
         return;
     }

     assert(len <= 4);
     /* non-zero functions are only exposed when function 0 is present,
      * allowing direct removal of unexposed functions.
      */
     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
         !pci_dev->enabled || is_pci_dev_ejected(pci_dev)) {
         return;
     }

     trace_pci_cfg_write(pci_dev->name, pci_dev_bus_num(pci_dev),
                         PCI_SLOT(pci_dev->devfn),
                         PCI_FUNC(pci_dev->devfn), addr, val);
     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
 }

 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
                                      uint32_t limit, uint32_t len)
 {
     uint32_t ret;

     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
     if (limit <= addr) {
         return ~0x0;
     }

     assert(len <= 4);
     /* non-zero functions are only exposed when function 0 is present,
      * allowing direct removal of unexposed functions.
      */
     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
         !pci_dev->enabled || is_pci_dev_ejected(pci_dev)) {
         return ~0x0;
     }

     ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
     trace_pci_cfg_read(pci_dev->name, pci_dev_bus_num(pci_dev),
                        PCI_SLOT(pci_dev->devfn),
                        PCI_FUNC(pci_dev->devfn), addr, ret);

     return ret;
 }

 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, unsigned len)
 {
     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

     if (!pci_dev) {
         trace_pci_cfg_write("empty", extract32(addr, 16, 8),
                             extract32(addr, 11, 5), extract32(addr, 8, 3),
                             config_addr, val);
         return;
     }

     pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
                                  val, len);
 }

 uint32_t pci_data_read(PCIBus *s, uint32_t addr, unsigned len)
 {
     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

     if (!pci_dev) {
         trace_pci_cfg_read("empty", extract32(addr, 16, 8),
                            extract32(addr, 11, 5), extract32(addr, 8, 3),
                            config_addr, ~0x0);
         return ~0x0;
     }

     return pci_host_config_read_common(pci_dev, config_addr,
                                        PCI_CONFIG_SPACE_SIZE, len);
 }

 static void pci_host_config_write(void *opaque, hwaddr addr,
                                   uint64_t val, unsigned len)
 {
     PCIHostState *s = opaque;

     PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx64"\n",
                 __func__, addr, len, val);
     if (addr != 0 || len != 4) {
         return;
     }
     s->config_reg = val;
 }

 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
                                      unsigned len)
 {
     PCIHostState *s = opaque;
     uint32_t val = s->config_reg;

     PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx32"\n",
                 __func__, addr, len, val);
     return val;
 }

 static void pci_host_data_write(void *opaque, hwaddr addr,
                                 uint64_t val, unsigned len)
 {
     PCIHostState *s = opaque;

     if (s->config_reg & (1u << 31))
         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 }

 static uint64_t pci_host_data_read(void *opaque,
                                    hwaddr addr, unsigned len)
 {
     PCIHostState *s = opaque;

     if (!(s->config_reg & (1U << 31))) {
         return 0xffffffff;
     }
     return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 }

 const MemoryRegionOps pci_host_conf_le_ops = {
     .read = pci_host_config_read,
     .write = pci_host_config_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };

 const MemoryRegionOps pci_host_conf_be_ops = {
     .read = pci_host_config_read,
     .write = pci_host_config_write,
     .endianness = DEVICE_BIG_ENDIAN,
 };

 const MemoryRegionOps pci_host_data_le_ops = {
     .read = pci_host_data_read,
     .write = pci_host_data_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };

 const MemoryRegionOps pci_host_data_be_ops = {
     .read = pci_host_data_read,
     .write = pci_host_data_write,
     .endianness = DEVICE_BIG_ENDIAN,
 };

 static bool pci_host_needed(void *opaque)
 {
     PCIHostState *s = opaque;
     return s->mig_enabled;
 }

 const VMStateDescription vmstate_pcihost = {
     .name = "PCIHost",
     .needed = pci_host_needed,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32(config_reg, PCIHostState),
         VMSTATE_END_OF_LIST()
     }
 };

 static Property pci_host_properties_common[] = {
     DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PCIHostState,
                      mig_enabled, true),
     DEFINE_PROP_BOOL(PCI_HOST_BYPASS_IOMMU, PCIHostState, bypass_iommu, false),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void pci_host_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     device_class_set_props(dc, pci_host_properties_common);
     dc->vmsd = &vmstate_pcihost;
 }

 static const TypeInfo pci_host_type_info = {
     .name = TYPE_PCI_HOST_BRIDGE,
     .parent = TYPE_SYS_BUS_DEVICE,
     .abstract = true,
     .class_size = sizeof(PCIHostBridgeClass),
     .instance_size = sizeof(PCIHostState),
     .class_init = pci_host_class_init,
 };

 static void pci_host_register_types(void)
 {
     type_register_static(&pci_host_type_info);
 }

 type_init(pci_host_register_types)
	/*
	* pci_host.c
	*
	* Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
	* VA Linux Systems Japan K.K.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.

	* This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "hw/pci/pci.h"
	#include "hw/pci/pci_bridge.h"
	#include "hw/pci/pci_host.h"
	#include "hw/qdev-properties.h"
	#include "qemu/module.h"
	#include "hw/pci/pci_bus.h"
	#include "migration/vmstate.h"
	#include "trace.h"

	/* debug PCI */
	//#define DEBUG_PCI

	#ifdef DEBUG_PCI
	#define PCI_DPRINTF(fmt, ...) \
	do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
	#else
	#define PCI_DPRINTF(fmt, ...)
	#endif

	/*
	* PCI address
	* bit 16 - 24: bus number
	* bit 8 - 15: devfun number
	* bit 0 - 7: offset in configuration space of a given pci device
	*/

	/* the helper function to get a PCIDevice* for a given pci address */
	static inline PCIDevice pci_dev_find_by_addr(PCIBus bus, uint32_t addr)
	{
	uint8_t bus_num = addr >> 16;
	uint8_t devfn = addr >> 8;

	return pci_find_device(bus, bus_num, devfn);
	}

	static void pci_adjust_config_limit(PCIBus bus, uint32_t limit)
	{
	if ((*limit > PCI_CONFIG_SPACE_SIZE) &&
	!pci_bus_allows_extended_config_space(bus)) {
	*limit = PCI_CONFIG_SPACE_SIZE;
	}
	}

	static bool is_pci_dev_ejected(PCIDevice *pci_dev)
	{
	/*
	* device unplug was requested and the guest acked it,
	* so we stop responding config accesses even if the
	* device is not deleted (failover flow)
	*/
	return pci_dev && pci_dev->partially_hotplugged &&
	!pci_dev->qdev.pending_deleted_event;
	}

	void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
	uint32_t limit, uint32_t val, uint32_t len)
	{
	pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
	if (limit <= addr) {
	return;
	}

	assert(len <= 4);
	/* non-zero functions are only exposed when function 0 is present,
	* allowing direct removal of unexposed functions.
	*/
	if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) \|\|
	!pci_dev->enabled \|\| is_pci_dev_ejected(pci_dev)) {
	return;
	}

	trace_pci_cfg_write(pci_dev->name, pci_dev_bus_num(pci_dev),
	PCI_SLOT(pci_dev->devfn),
	PCI_FUNC(pci_dev->devfn), addr, val);
	pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
	}

	uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
	uint32_t limit, uint32_t len)
	{
	uint32_t ret;

	pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
	if (limit <= addr) {
	return ~0x0;
	}

	assert(len <= 4);
	/* non-zero functions are only exposed when function 0 is present,
	* allowing direct removal of unexposed functions.
	*/
	if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) \|\|
	!pci_dev->enabled \|\| is_pci_dev_ejected(pci_dev)) {
	return ~0x0;
	}

	ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
	trace_pci_cfg_read(pci_dev->name, pci_dev_bus_num(pci_dev),
	PCI_SLOT(pci_dev->devfn),
	PCI_FUNC(pci_dev->devfn), addr, ret);

	return ret;
	}

	void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, unsigned len)
	{
	PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
	uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

	if (!pci_dev) {
	trace_pci_cfg_write("empty", extract32(addr, 16, 8),
	extract32(addr, 11, 5), extract32(addr, 8, 3),
	config_addr, val);
	return;
	}

	pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
	val, len);
	}

	uint32_t pci_data_read(PCIBus *s, uint32_t addr, unsigned len)
	{
	PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
	uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);

	if (!pci_dev) {
	trace_pci_cfg_read("empty", extract32(addr, 16, 8),
	extract32(addr, 11, 5), extract32(addr, 8, 3),
	config_addr, ~0x0);
	return ~0x0;
	}

	return pci_host_config_read_common(pci_dev, config_addr,
	PCI_CONFIG_SPACE_SIZE, len);
	}

	static void pci_host_config_write(void *opaque, hwaddr addr,
	uint64_t val, unsigned len)
	{
	PCIHostState *s = opaque;

	PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx64"\n",
	__func__, addr, len, val);
	if (addr != 0 \|\| len != 4) {
	return;
	}
	s->config_reg = val;
	}

	static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
	unsigned len)
	{
	PCIHostState *s = opaque;
	uint32_t val = s->config_reg;

	PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx32"\n",
	__func__, addr, len, val);
	return val;
	}

	static void pci_host_data_write(void *opaque, hwaddr addr,
	uint64_t val, unsigned len)
	{
	PCIHostState *s = opaque;

	if (s->config_reg & (1u << 31))
	pci_data_write(s->bus, s->config_reg \| (addr & 3), val, len);
	}

	static uint64_t pci_host_data_read(void *opaque,
	hwaddr addr, unsigned len)
	{
	PCIHostState *s = opaque;

	if (!(s->config_reg & (1U << 31))) {
	return 0xffffffff;
	}
	return pci_data_read(s->bus, s->config_reg \| (addr & 3), len);
	}

	const MemoryRegionOps pci_host_conf_le_ops = {
	.read = pci_host_config_read,
	.write = pci_host_config_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	};

	const MemoryRegionOps pci_host_conf_be_ops = {
	.read = pci_host_config_read,
	.write = pci_host_config_write,
	.endianness = DEVICE_BIG_ENDIAN,
	};

	const MemoryRegionOps pci_host_data_le_ops = {
	.read = pci_host_data_read,
	.write = pci_host_data_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	};

	const MemoryRegionOps pci_host_data_be_ops = {
	.read = pci_host_data_read,
	.write = pci_host_data_write,
	.endianness = DEVICE_BIG_ENDIAN,
	};

	static bool pci_host_needed(void *opaque)
	{
	PCIHostState *s = opaque;
	return s->mig_enabled;
	}

	const VMStateDescription vmstate_pcihost = {
	.name = "PCIHost",
	.needed = pci_host_needed,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (const VMStateField[]) {
	VMSTATE_UINT32(config_reg, PCIHostState),
	VMSTATE_END_OF_LIST()
	}
	};

	static Property pci_host_properties_common[] = {
	DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PCIHostState,
	mig_enabled, true),
	DEFINE_PROP_BOOL(PCI_HOST_BYPASS_IOMMU, PCIHostState, bypass_iommu, false),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void pci_host_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	device_class_set_props(dc, pci_host_properties_common);
	dc->vmsd = &vmstate_pcihost;
	}

	static const TypeInfo pci_host_type_info = {
	.name = TYPE_PCI_HOST_BRIDGE,
	.parent = TYPE_SYS_BUS_DEVICE,
	.abstract = true,
	.class_size = sizeof(PCIHostBridgeClass),
	.instance_size = sizeof(PCIHostState),
	.class_init = pci_host_class_init,
	};

	static void pci_host_register_types(void)
	{
	type_register_static(&pci_host_type_info);
	}

	type_init(pci_host_register_types)