[PATCH 4/4] pci: add pci test device

Michael S. Tsirkin
2013-04-03T08:58:52Z

This device is used for kvm unit tests,
currently it supports testing performance of ioeventfd.
Using updated kvm unittest, here's an example output:
mmio-no-eventfd:pci-mem 8796
mmio-wildcard-eventfd:pci-mem 3609
mmio-datamatch-eventfd:pci-mem 3685
portio-no-eventfd:pci-io 5287
portio-wildcard-eventfd:pci-io 1762
portio-datamatch-eventfd:pci-io 1777

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
hw/i386/Makefile.objs | 2 +-
hw/pci-testdev.c | 306 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/pci/pci.h | 1 +
3 files changed, 308 insertions(+), 1 deletion(-)
create mode 100644 hw/pci-testdev.c

diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index a78c0b2..7497e7a 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -11,7 +11,7 @@ obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_msi.o
obj-y += kvm/
obj-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
-obj-y += pc-testdev.o
+obj-y += pc-testdev.o pci-testdev.o

obj-y := $(addprefix ../,$(obj-y))

diff --git a/hw/pci-testdev.c b/hw/pci-testdev.c
new file mode 100644
index 0000000..9486624
--- /dev/null
+++ b/hw/pci-testdev.c
@@ -0,0 +1,306 @@
+#include "hw/hw.h"
+#include "hw/pci/pci.h"
+#include "qemu/event_notifier.h"
+#include "qemu/osdep.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 {
+ PCIDevice dev;
+ MemoryRegion mmio;
+ MemoryRegion portio;
+ IOTest *tests;
+ int current;
+} PCITestDevState;
+
+#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 int pci_testdev_init(PCIDevice *pci_dev)
+{
+ PCITestDevState *d = DO_UPCAST(PCITestDevState, dev, pci_dev);
+ uint8_t *pci_conf;
+ char *name;
+ int r, i;
+
+ pci_conf = d->dev.config;
+
+ pci_conf[PCI_INTERRUPT_PIN] = 0; /* no interrupt pin */
+
+ memory_region_init_io(&d->mmio, &pci_testdev_mmio_ops, d,
+ "pci-testdev-mmio", IOTEST_MEMSIZE * 2);
+ memory_region_init_io(&d->portio, &pci_testdev_pio_ops, d,
+ "pci-testdev-portio", IOTEST_IOSIZE * 2);
+ pci_register_bar(&d->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
+ pci_register_bar(&d->dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->portio);
+
+ 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->size = IOTEST_ACCESS_WIDTH;
+ test->match_data = strcmp(IOTEST_TEST(i), "wildcard-eventfd");
+ 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;
+ }
+
+ return 0;
+}
+
+static void
+pci_testdev_uninit(PCIDevice *dev)
+{
+ PCITestDevState *d = DO_UPCAST(PCITestDevState, 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);
+ memory_region_destroy(&d->mmio);
+ memory_region_destroy(&d->portio);
+}
+
+static void qdev_pci_testdev_reset(DeviceState *dev)
+{
+ PCITestDevState *d = DO_UPCAST(PCITestDevState, dev.qdev, dev);
+ pci_testdev_reset(d);
+}
+
+static void pci_testdev_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->init = pci_testdev_init;
+ 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";
+ dc->reset = qdev_pci_testdev_reset;
+}
+
+static const TypeInfo pci_testdev_info = {
+ .name = "pci-testdev",
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(PCITestDevState),
+ .class_init = pci_testdev_class_init,
+};
+
+static void pci_testdev_register_types(void)
+{
+ type_register_static(&pci_testdev_info);
+}
+
+type_init(pci_testdev_register_types)
diff --git a/hw/pci/pci.h b/hw/pci/pci.h
index 774369c..d81198c 100644
--- a/hw/pci/pci.h
+++ b/hw/pci/pci.h
@@ -84,6 +84,7 @@
#define PCI_DEVICE_ID_REDHAT_SERIAL 0x0002
#define PCI_DEVICE_ID_REDHAT_SERIAL2 0x0003
#define PCI_DEVICE_ID_REDHAT_SERIAL4 0x0004
+#define PCI_DEVICE_ID_REDHAT_TEST 0x0005
#define PCI_DEVICE_ID_REDHAT_QXL 0x0100

#define FMT_PCIBUS PRIx64
--
MST