hw/misc/pci-testdev.c - qemu - Git at Google

 /*
  * QEMU PCI test device
  *
  * Copyright (c) 2012 Red Hat Inc.
  * Author: Michael S. Tsirkin <mst@redhat.com>
  *
  * 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/hw.h"
 #include "hw/pci/pci.h"
 #include "qemu/event_notifier.h"
 #include "sysemu/kvm.h"

 typedef struct PCITestDevHdr {
     uint8_t test;
     uint8_t width;
     uint8_t pad0[2];
     uint32_t offset;
     uint8_t data;
     uint8_t pad1[3];
     uint32_t count;
     uint8_t name[];
 } PCITestDevHdr;

 typedef struct IOTest {
     MemoryRegion *mr;
     EventNotifier notifier;
     bool hasnotifier;
     unsigned size;
     bool match_data;
     PCITestDevHdr *hdr;
     unsigned bufsize;
 } IOTest;

 #define IOTEST_DATAMATCH 0xFA
 #define IOTEST_NOMATCH   0xCE

 #define IOTEST_IOSIZE 128
 #define IOTEST_MEMSIZE 2048

 static const char *iotest_test[] = {
     "no-eventfd",
     "wildcard-eventfd",
     "datamatch-eventfd"
 };

 static const char *iotest_type[] = {
     "mmio",
     "portio"
 };

 #define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))])
 #define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))])
 #define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test))
 #define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type))
 #define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE)

 enum {
     IOTEST_ACCESS_NAME,
     IOTEST_ACCESS_DATA,
     IOTEST_ACCESS_MAX,
 };

 #define IOTEST_ACCESS_TYPE uint8_t
 #define IOTEST_ACCESS_WIDTH (sizeof(uint8_t))

 typedef struct PCITestDevState {
     /*< private >*/
     PCIDevice parent_obj;
     /*< public >*/

     MemoryRegion mmio;
     MemoryRegion portio;
     IOTest *tests;
     int current;

     uint64_t membar_size;
     MemoryRegion membar;
 } PCITestDevState;

 #define TYPE_PCI_TEST_DEV "pci-testdev"

 #define PCI_TEST_DEV(obj) \
     OBJECT_CHECK(PCITestDevState, (obj), TYPE_PCI_TEST_DEV)

 #define IOTEST_IS_MEM(i) (strcmp(IOTEST_TYPE(i), "portio"))
 #define IOTEST_REGION(d, i) (IOTEST_IS_MEM(i) ?  &(d)->mmio : &(d)->portio)
 #define IOTEST_SIZE(i) (IOTEST_IS_MEM(i) ? IOTEST_MEMSIZE : IOTEST_IOSIZE)
 #define IOTEST_PCI_BAR(i) (IOTEST_IS_MEM(i) ? PCI_BASE_ADDRESS_SPACE_MEMORY : \
                            PCI_BASE_ADDRESS_SPACE_IO)

 static int pci_testdev_start(IOTest *test)
 {
     test->hdr->count = 0;
     if (!test->hasnotifier) {
         return 0;
     }
     event_notifier_test_and_clear(&test->notifier);
     memory_region_add_eventfd(test->mr,
                               le32_to_cpu(test->hdr->offset),
                               test->size,
                               test->match_data,
                               test->hdr->data,
                               &test->notifier);
     return 0;
 }

 static void pci_testdev_stop(IOTest *test)
 {
     if (!test->hasnotifier) {
         return;
     }
     memory_region_del_eventfd(test->mr,
                               le32_to_cpu(test->hdr->offset),
                               test->size,
                               test->match_data,
                               test->hdr->data,
                               &test->notifier);
 }

 static void
 pci_testdev_reset(PCITestDevState *d)
 {
     if (d->current == -1) {
         return;
     }
     pci_testdev_stop(&d->tests[d->current]);
     d->current = -1;
 }

 static void pci_testdev_inc(IOTest *test, unsigned inc)
 {
     uint32_t c = le32_to_cpu(test->hdr->count);
     test->hdr->count = cpu_to_le32(c + inc);
 }

 static void
 pci_testdev_write(void *opaque, hwaddr addr, uint64_t val,
                   unsigned size, int type)
 {
     PCITestDevState *d = opaque;
     IOTest *test;
     int t, r;

     if (addr == offsetof(PCITestDevHdr, test)) {
         pci_testdev_reset(d);
         if (val >= IOTEST_MAX_TEST) {
             return;
         }
         t = type * IOTEST_MAX_TEST + val;
         r = pci_testdev_start(&d->tests[t]);
         if (r < 0) {
             return;
         }
         d->current = t;
         return;
     }
     if (d->current < 0) {
         return;
     }
     test = &d->tests[d->current];
     if (addr != le32_to_cpu(test->hdr->offset)) {
         return;
     }
     if (test->match_data && test->size != size) {
         return;
     }
     if (test->match_data && val != test->hdr->data) {
         return;
     }
     pci_testdev_inc(test, 1);
 }

 static uint64_t
 pci_testdev_read(void *opaque, hwaddr addr, unsigned size)
 {
     PCITestDevState *d = opaque;
     const char *buf;
     IOTest *test;
     if (d->current < 0) {
         return 0;
     }
     test = &d->tests[d->current];
     buf = (const char *)test->hdr;
     if (addr + size >= test->bufsize) {
         return 0;
     }
     if (test->hasnotifier) {
         event_notifier_test_and_clear(&test->notifier);
     }
     return buf[addr];
 }

 static void
 pci_testdev_mmio_write(void *opaque, hwaddr addr, uint64_t val,
                        unsigned size)
 {
     pci_testdev_write(opaque, addr, val, size, 0);
 }

 static void
 pci_testdev_pio_write(void *opaque, hwaddr addr, uint64_t val,
                        unsigned size)
 {
     pci_testdev_write(opaque, addr, val, size, 1);
 }

 static const MemoryRegionOps pci_testdev_mmio_ops = {
     .read = pci_testdev_read,
     .write = pci_testdev_mmio_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .impl = {
         .min_access_size = 1,
         .max_access_size = 1,
     },
 };

 static const MemoryRegionOps pci_testdev_pio_ops = {
     .read = pci_testdev_read,
     .write = pci_testdev_pio_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .impl = {
         .min_access_size = 1,
         .max_access_size = 1,
     },
 };

 static void pci_testdev_realize(PCIDevice *pci_dev, Error **errp)
 {
     PCITestDevState *d = PCI_TEST_DEV(pci_dev);
     uint8_t *pci_conf;
     char *name;
     int r, i;
     bool fastmmio = kvm_ioeventfd_any_length_enabled();

     pci_conf = pci_dev->config;

     pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */

     memory_region_init_io(&d->mmio, OBJECT(d), &pci_testdev_mmio_ops, d,
                           "pci-testdev-mmio", IOTEST_MEMSIZE * 2);
     memory_region_init_io(&d->portio, OBJECT(d), &pci_testdev_pio_ops, d,
                           "pci-testdev-portio", IOTEST_IOSIZE * 2);
     pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio);

     if (d->membar_size) {
         memory_region_init(&d->membar, OBJECT(d), "pci-testdev-membar",
                            d->membar_size);
         pci_register_bar(pci_dev, 2,
                          PCI_BASE_ADDRESS_SPACE_MEMORY |
                          PCI_BASE_ADDRESS_MEM_PREFETCH |
                          PCI_BASE_ADDRESS_MEM_TYPE_64,
                          &d->membar);
     }

     d->current = -1;
     d->tests = g_malloc0(IOTEST_MAX * sizeof *d->tests);
     for (i = 0; i < IOTEST_MAX; ++i) {
         IOTest *test = &d->tests[i];
         name = g_strdup_printf("%s-%s", IOTEST_TYPE(i), IOTEST_TEST(i));
         test->bufsize = sizeof(PCITestDevHdr) + strlen(name) + 1;
         test->hdr = g_malloc0(test->bufsize);
         memcpy(test->hdr->name, name, strlen(name) + 1);
         g_free(name);
         test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH);
         test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd");
         if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) {
             test->size = 0;
         } else {
             test->size = IOTEST_ACCESS_WIDTH;
         }
         test->hdr->test = i;
         test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH;
         test->hdr->width = IOTEST_ACCESS_WIDTH;
         test->mr = IOTEST_REGION(d, i);
         if (!strcmp(IOTEST_TEST(i), "no-eventfd")) {
             test->hasnotifier = false;
             continue;
         }
         r = event_notifier_init(&test->notifier, 0);
         assert(r >= 0);
         test->hasnotifier = true;
     }
 }

 static void
 pci_testdev_uninit(PCIDevice *dev)
 {
     PCITestDevState *d = PCI_TEST_DEV(dev);
     int i;

     pci_testdev_reset(d);
     for (i = 0; i < IOTEST_MAX; ++i) {
         if (d->tests[i].hasnotifier) {
             event_notifier_cleanup(&d->tests[i].notifier);
         }
         g_free(d->tests[i].hdr);
     }
     g_free(d->tests);
 }

 static void qdev_pci_testdev_reset(DeviceState *dev)
 {
     PCITestDevState *d = PCI_TEST_DEV(dev);
     pci_testdev_reset(d);
 }

 static Property pci_testdev_properties[] = {
     DEFINE_PROP_SIZE("membar", PCITestDevState, membar_size, 0),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void pci_testdev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

     k->realize = pci_testdev_realize;
     k->exit = pci_testdev_uninit;
     k->vendor_id = PCI_VENDOR_ID_REDHAT;
     k->device_id = PCI_DEVICE_ID_REDHAT_TEST;
     k->revision = 0x00;
     k->class_id = PCI_CLASS_OTHERS;
     dc->desc = "PCI Test Device";
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     dc->reset = qdev_pci_testdev_reset;
     dc->props = pci_testdev_properties;
 }

 static const TypeInfo pci_testdev_info = {
     .name          = TYPE_PCI_TEST_DEV,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PCITestDevState),
     .class_init    = pci_testdev_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { },
     },
 };

 static void pci_testdev_register_types(void)
 {
     type_register_static(&pci_testdev_info);
 }

 type_init(pci_testdev_register_types)
	/*
	* QEMU PCI test device
	*
	* Copyright (c) 2012 Red Hat Inc.
	* Author: Michael S. Tsirkin <mst@redhat.com>
	*
	* 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/hw.h"
	#include "hw/pci/pci.h"
	#include "qemu/event_notifier.h"
	#include "sysemu/kvm.h"

	typedef struct PCITestDevHdr {
	uint8_t test;
	uint8_t width;
	uint8_t pad0[2];
	uint32_t offset;
	uint8_t data;
	uint8_t pad1[3];
	uint32_t count;
	uint8_t name[];
	} PCITestDevHdr;

	typedef struct IOTest {
	MemoryRegion *mr;
	EventNotifier notifier;
	bool hasnotifier;
	unsigned size;
	bool match_data;
	PCITestDevHdr *hdr;
	unsigned bufsize;
	} IOTest;

	#define IOTEST_DATAMATCH 0xFA
	#define IOTEST_NOMATCH 0xCE

	#define IOTEST_IOSIZE 128
	#define IOTEST_MEMSIZE 2048

	static const char *iotest_test[] = {
	"no-eventfd",
	"wildcard-eventfd",
	"datamatch-eventfd"
	};

	static const char *iotest_type[] = {
	"mmio",
	"portio"
	};

	#define IOTEST_TEST(i) (iotest_test[((i) % ARRAY_SIZE(iotest_test))])
	#define IOTEST_TYPE(i) (iotest_type[((i) / ARRAY_SIZE(iotest_test))])
	#define IOTEST_MAX_TEST (ARRAY_SIZE(iotest_test))
	#define IOTEST_MAX_TYPE (ARRAY_SIZE(iotest_type))
	#define IOTEST_MAX (IOTEST_MAX_TEST * IOTEST_MAX_TYPE)

	enum {
	IOTEST_ACCESS_NAME,
	IOTEST_ACCESS_DATA,
	IOTEST_ACCESS_MAX,
	};

	#define IOTEST_ACCESS_TYPE uint8_t
	#define IOTEST_ACCESS_WIDTH (sizeof(uint8_t))

	typedef struct PCITestDevState {
	/< private >/
	PCIDevice parent_obj;
	/< public >/

	MemoryRegion mmio;
	MemoryRegion portio;
	IOTest *tests;
	int current;

	uint64_t membar_size;
	MemoryRegion membar;
	} PCITestDevState;

	#define TYPE_PCI_TEST_DEV "pci-testdev"

	#define PCI_TEST_DEV(obj) \
	OBJECT_CHECK(PCITestDevState, (obj), TYPE_PCI_TEST_DEV)

	#define IOTEST_IS_MEM(i) (strcmp(IOTEST_TYPE(i), "portio"))
	#define IOTEST_REGION(d, i) (IOTEST_IS_MEM(i) ? &(d)->mmio : &(d)->portio)
	#define IOTEST_SIZE(i) (IOTEST_IS_MEM(i) ? IOTEST_MEMSIZE : IOTEST_IOSIZE)
	#define IOTEST_PCI_BAR(i) (IOTEST_IS_MEM(i) ? PCI_BASE_ADDRESS_SPACE_MEMORY : \
	PCI_BASE_ADDRESS_SPACE_IO)

	static int pci_testdev_start(IOTest *test)
	{
	test->hdr->count = 0;
	if (!test->hasnotifier) {
	return 0;
	}
	event_notifier_test_and_clear(&test->notifier);
	memory_region_add_eventfd(test->mr,
	le32_to_cpu(test->hdr->offset),
	test->size,
	test->match_data,
	test->hdr->data,
	&test->notifier);
	return 0;
	}

	static void pci_testdev_stop(IOTest *test)
	{
	if (!test->hasnotifier) {
	return;
	}
	memory_region_del_eventfd(test->mr,
	le32_to_cpu(test->hdr->offset),
	test->size,
	test->match_data,
	test->hdr->data,
	&test->notifier);
	}

	static void
	pci_testdev_reset(PCITestDevState *d)
	{
	if (d->current == -1) {
	return;
	}
	pci_testdev_stop(&d->tests[d->current]);
	d->current = -1;
	}

	static void pci_testdev_inc(IOTest *test, unsigned inc)
	{
	uint32_t c = le32_to_cpu(test->hdr->count);
	test->hdr->count = cpu_to_le32(c + inc);
	}

	static void
	pci_testdev_write(void *opaque, hwaddr addr, uint64_t val,
	unsigned size, int type)
	{
	PCITestDevState *d = opaque;
	IOTest *test;
	int t, r;

	if (addr == offsetof(PCITestDevHdr, test)) {
	pci_testdev_reset(d);
	if (val >= IOTEST_MAX_TEST) {
	return;
	}
	t = type * IOTEST_MAX_TEST + val;
	r = pci_testdev_start(&d->tests[t]);
	if (r < 0) {
	return;
	}
	d->current = t;
	return;
	}
	if (d->current < 0) {
	return;
	}
	test = &d->tests[d->current];
	if (addr != le32_to_cpu(test->hdr->offset)) {
	return;
	}
	if (test->match_data && test->size != size) {
	return;
	}
	if (test->match_data && val != test->hdr->data) {
	return;
	}
	pci_testdev_inc(test, 1);
	}

	static uint64_t
	pci_testdev_read(void *opaque, hwaddr addr, unsigned size)
	{
	PCITestDevState *d = opaque;
	const char *buf;
	IOTest *test;
	if (d->current < 0) {
	return 0;
	}
	test = &d->tests[d->current];
	buf = (const char *)test->hdr;
	if (addr + size >= test->bufsize) {
	return 0;
	}
	if (test->hasnotifier) {
	event_notifier_test_and_clear(&test->notifier);
	}
	return buf[addr];
	}

	static void
	pci_testdev_mmio_write(void *opaque, hwaddr addr, uint64_t val,
	unsigned size)
	{
	pci_testdev_write(opaque, addr, val, size, 0);
	}

	static void
	pci_testdev_pio_write(void *opaque, hwaddr addr, uint64_t val,
	unsigned size)
	{
	pci_testdev_write(opaque, addr, val, size, 1);
	}

	static const MemoryRegionOps pci_testdev_mmio_ops = {
	.read = pci_testdev_read,
	.write = pci_testdev_mmio_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.impl = {
	.min_access_size = 1,
	.max_access_size = 1,
	},
	};

	static const MemoryRegionOps pci_testdev_pio_ops = {
	.read = pci_testdev_read,
	.write = pci_testdev_pio_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.impl = {
	.min_access_size = 1,
	.max_access_size = 1,
	},
	};

	static void pci_testdev_realize(PCIDevice pci_dev, Error *errp)
	{
	PCITestDevState *d = PCI_TEST_DEV(pci_dev);
	uint8_t *pci_conf;
	char *name;
	int r, i;
	bool fastmmio = kvm_ioeventfd_any_length_enabled();

	pci_conf = pci_dev->config;

	pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */

	memory_region_init_io(&d->mmio, OBJECT(d), &pci_testdev_mmio_ops, d,
	"pci-testdev-mmio", IOTEST_MEMSIZE * 2);
	memory_region_init_io(&d->portio, OBJECT(d), &pci_testdev_pio_ops, d,
	"pci-testdev-portio", IOTEST_IOSIZE * 2);
	pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
	pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio);

	if (d->membar_size) {
	memory_region_init(&d->membar, OBJECT(d), "pci-testdev-membar",
	d->membar_size);
	pci_register_bar(pci_dev, 2,
	PCI_BASE_ADDRESS_SPACE_MEMORY \|
	PCI_BASE_ADDRESS_MEM_PREFETCH \|
	PCI_BASE_ADDRESS_MEM_TYPE_64,
	&d->membar);
	}

	d->current = -1;
	d->tests = g_malloc0(IOTEST_MAX * sizeof *d->tests);
	for (i = 0; i < IOTEST_MAX; ++i) {
	IOTest *test = &d->tests[i];
	name = g_strdup_printf("%s-%s", IOTEST_TYPE(i), IOTEST_TEST(i));
	test->bufsize = sizeof(PCITestDevHdr) + strlen(name) + 1;
	test->hdr = g_malloc0(test->bufsize);
	memcpy(test->hdr->name, name, strlen(name) + 1);
	g_free(name);
	test->hdr->offset = cpu_to_le32(IOTEST_SIZE(i) + i * IOTEST_ACCESS_WIDTH);
	test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd");
	if (fastmmio && IOTEST_IS_MEM(i) && !test->match_data) {
	test->size = 0;
	} else {
	test->size = IOTEST_ACCESS_WIDTH;
	}
	test->hdr->test = i;
	test->hdr->data = test->match_data ? IOTEST_DATAMATCH : IOTEST_NOMATCH;
	test->hdr->width = IOTEST_ACCESS_WIDTH;
	test->mr = IOTEST_REGION(d, i);
	if (!strcmp(IOTEST_TEST(i), "no-eventfd")) {
	test->hasnotifier = false;
	continue;
	}
	r = event_notifier_init(&test->notifier, 0);
	assert(r >= 0);
	test->hasnotifier = true;
	}
	}

	static void
	pci_testdev_uninit(PCIDevice *dev)
	{
	PCITestDevState *d = PCI_TEST_DEV(dev);
	int i;

	pci_testdev_reset(d);
	for (i = 0; i < IOTEST_MAX; ++i) {
	if (d->tests[i].hasnotifier) {
	event_notifier_cleanup(&d->tests[i].notifier);
	}
	g_free(d->tests[i].hdr);
	}
	g_free(d->tests);
	}

	static void qdev_pci_testdev_reset(DeviceState *dev)
	{
	PCITestDevState *d = PCI_TEST_DEV(dev);
	pci_testdev_reset(d);
	}

	static Property pci_testdev_properties[] = {
	DEFINE_PROP_SIZE("membar", PCITestDevState, membar_size, 0),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void pci_testdev_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

	k->realize = pci_testdev_realize;
	k->exit = pci_testdev_uninit;
	k->vendor_id = PCI_VENDOR_ID_REDHAT;
	k->device_id = PCI_DEVICE_ID_REDHAT_TEST;
	k->revision = 0x00;
	k->class_id = PCI_CLASS_OTHERS;
	dc->desc = "PCI Test Device";
	set_bit(DEVICE_CATEGORY_MISC, dc->categories);
	dc->reset = qdev_pci_testdev_reset;
	dc->props = pci_testdev_properties;
	}

	static const TypeInfo pci_testdev_info = {
	.name = TYPE_PCI_TEST_DEV,
	.parent = TYPE_PCI_DEVICE,
	.instance_size = sizeof(PCITestDevState),
	.class_init = pci_testdev_class_init,
	.interfaces = (InterfaceInfo[]) {
	{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
	{ },
	},
	};

	static void pci_testdev_register_types(void)
	{
	type_register_static(&pci_testdev_info);
	}

	type_init(pci_testdev_register_types)