[mirror_qemu.git] / hw / misc / edu.c

/*
 * QEMU educational PCI device
 *
 * Copyright (c) 2012-2015 Jiri Slaby
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "hw/pci/pci.h"
#include "hw/pci/msi.h"
#include "qemu/timer.h"
#include "qemu/main-loop.h" /* iothread mutex */
#include "qapi/visitor.h"

#define EDU(obj)        OBJECT_CHECK(EduState, obj, "edu")

#define FACT_IRQ        0x00000001
#define DMA_IRQ         0x00000100

#define DMA_START       0x40000
#define DMA_SIZE        4096

typedef struct {
    PCIDevice pdev;
    MemoryRegion mmio;

    QemuThread thread;
    QemuMutex thr_mutex;
    QemuCond thr_cond;
    bool stopping;

    uint32_t addr4;
    uint32_t fact;
#define EDU_STATUS_COMPUTING    0x01
#define EDU_STATUS_IRQFACT      0x80
    uint32_t status;

    uint32_t irq_status;

#define EDU_DMA_RUN             0x1
#define EDU_DMA_DIR(cmd)        (((cmd) & 0x2) >> 1)
# define EDU_DMA_FROM_PCI       0
# define EDU_DMA_TO_PCI         1
#define EDU_DMA_IRQ             0x4
    struct dma_state {
        dma_addr_t src;
        dma_addr_t dst;
        dma_addr_t cnt;
        dma_addr_t cmd;
    } dma;
    QEMUTimer dma_timer;
    char dma_buf[DMA_SIZE];
    uint64_t dma_mask;
} EduState;

static bool edu_msi_enabled(EduState *edu)
{
    return msi_enabled(&edu->pdev);
}

static void edu_raise_irq(EduState *edu, uint32_t val)
{
    edu->irq_status |= val;
    if (edu->irq_status) {
        if (edu_msi_enabled(edu)) {
            msi_notify(&edu->pdev, 0);
        } else {
            pci_set_irq(&edu->pdev, 1);
        }
    }
}

static void edu_lower_irq(EduState *edu, uint32_t val)
{
    edu->irq_status &= ~val;

    if (!edu->irq_status && !edu_msi_enabled(edu)) {
        pci_set_irq(&edu->pdev, 0);
    }
}

static bool within(uint32_t addr, uint32_t start, uint32_t end)
{
    return start <= addr && addr < end;
}

static void edu_check_range(uint32_t addr, uint32_t size1, uint32_t start,
                uint32_t size2)
{
    uint32_t end1 = addr + size1;
    uint32_t end2 = start + size2;

    if (within(addr, start, end2) &&
            end1 > addr && within(end1, start, end2)) {
        return;
    }

    hw_error("EDU: DMA range 0x%.8x-0x%.8x out of bounds (0x%.8x-0x%.8x)!",
            addr, end1 - 1, start, end2 - 1);
}

static dma_addr_t edu_clamp_addr(const EduState *edu, dma_addr_t addr)
{
    dma_addr_t res = addr & edu->dma_mask;

    if (addr != res) {
        printf("EDU: clamping DMA %#.16"PRIx64" to %#.16"PRIx64"!\n", addr, res);
    }

    return res;
}

static void edu_dma_timer(void *opaque)
{
    EduState *edu = opaque;
    bool raise_irq = false;

    if (!(edu->dma.cmd & EDU_DMA_RUN)) {
        return;
    }

    if (EDU_DMA_DIR(edu->dma.cmd) == EDU_DMA_FROM_PCI) {
        uint32_t dst = edu->dma.dst;
        edu_check_range(dst, edu->dma.cnt, DMA_START, DMA_SIZE);
        dst -= DMA_START;
        pci_dma_read(&edu->pdev, edu_clamp_addr(edu, edu->dma.src),
                edu->dma_buf + dst, edu->dma.cnt);
    } else {
        uint32_t src = edu->dma.src;
        edu_check_range(src, edu->dma.cnt, DMA_START, DMA_SIZE);
        src -= DMA_START;
        pci_dma_write(&edu->pdev, edu_clamp_addr(edu, edu->dma.dst),
                edu->dma_buf + src, edu->dma.cnt);
    }

    edu->dma.cmd &= ~EDU_DMA_RUN;
    if (edu->dma.cmd & EDU_DMA_IRQ) {
        raise_irq = true;
    }

    if (raise_irq) {
        edu_raise_irq(edu, DMA_IRQ);
    }
}

static void dma_rw(EduState *edu, bool write, dma_addr_t *val, dma_addr_t *dma,
                bool timer)
{
    if (write && (edu->dma.cmd & EDU_DMA_RUN)) {
        return;
    }

    if (write) {
        *dma = *val;
    } else {
        *val = *dma;
    }

    if (timer) {
        timer_mod(&edu->dma_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 100);
    }
}

static uint64_t edu_mmio_read(void *opaque, hwaddr addr, unsigned size)
{
    EduState *edu = opaque;
    uint64_t val = ~0ULL;

    if (size != 4) {
        return val;
    }

    switch (addr) {
    case 0x00:
        val = 0x010000edu;
        break;
    case 0x04:
        val = edu->addr4;
        break;
    case 0x08:
        qemu_mutex_lock(&edu->thr_mutex);
        val = edu->fact;
        qemu_mutex_unlock(&edu->thr_mutex);
        break;
    case 0x20:
        val = atomic_read(&edu->status);
        break;
    case 0x24:
        val = edu->irq_status;
        break;
    case 0x80:
        dma_rw(edu, false, &val, &edu->dma.src, false);
        break;
    case 0x88:
        dma_rw(edu, false, &val, &edu->dma.dst, false);
        break;
    case 0x90:
        dma_rw(edu, false, &val, &edu->dma.cnt, false);
        break;
    case 0x98:
        dma_rw(edu, false, &val, &edu->dma.cmd, false);
        break;
    }

    return val;
}

static void edu_mmio_write(void *opaque, hwaddr addr, uint64_t val,
                unsigned size)
{
    EduState *edu = opaque;

    if (addr < 0x80 && size != 4) {
        return;
    }

    if (addr >= 0x80 && size != 4 && size != 8) {
        return;
    }

    switch (addr) {
    case 0x04:
        edu->addr4 = ~val;
        break;
    case 0x08:
        if (atomic_read(&edu->status) & EDU_STATUS_COMPUTING) {
            break;
        }
        /* EDU_STATUS_COMPUTING cannot go 0->1 concurrently, because it is only
         * set in this function and it is under the iothread mutex.
         */
        qemu_mutex_lock(&edu->thr_mutex);
        edu->fact = val;
        atomic_or(&edu->status, EDU_STATUS_COMPUTING);
        qemu_cond_signal(&edu->thr_cond);
        qemu_mutex_unlock(&edu->thr_mutex);
        break;
    case 0x20:
        if (val & EDU_STATUS_IRQFACT) {
            atomic_or(&edu->status, EDU_STATUS_IRQFACT);
        } else {
            atomic_and(&edu->status, ~EDU_STATUS_IRQFACT);
        }
        break;
    case 0x60:
        edu_raise_irq(edu, val);
        break;
    case 0x64:
        edu_lower_irq(edu, val);
        break;
    case 0x80:
        dma_rw(edu, true, &val, &edu->dma.src, false);
        break;
    case 0x88:
        dma_rw(edu, true, &val, &edu->dma.dst, false);
        break;
    case 0x90:
        dma_rw(edu, true, &val, &edu->dma.cnt, false);
        break;
    case 0x98:
        if (!(val & EDU_DMA_RUN)) {
            break;
        }
        dma_rw(edu, true, &val, &edu->dma.cmd, true);
        break;
    }
}

static const MemoryRegionOps edu_mmio_ops = {
    .read = edu_mmio_read,
    .write = edu_mmio_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

/*
 * We purposely use a thread, so that users are forced to wait for the status
 * register.
 */
static void *edu_fact_thread(void *opaque)
{
    EduState *edu = opaque;

    while (1) {
        uint32_t val, ret = 1;

        qemu_mutex_lock(&edu->thr_mutex);
        while ((atomic_read(&edu->status) & EDU_STATUS_COMPUTING) == 0 &&
                        !edu->stopping) {
            qemu_cond_wait(&edu->thr_cond, &edu->thr_mutex);
        }

        if (edu->stopping) {
            qemu_mutex_unlock(&edu->thr_mutex);
            break;
        }

        val = edu->fact;
        qemu_mutex_unlock(&edu->thr_mutex);

        while (val > 0) {
            ret *= val--;
        }

        /*
         * We should sleep for a random period here, so that students are
         * forced to check the status properly.
         */

        qemu_mutex_lock(&edu->thr_mutex);
        edu->fact = ret;
        qemu_mutex_unlock(&edu->thr_mutex);
        atomic_and(&edu->status, ~EDU_STATUS_COMPUTING);

        if (atomic_read(&edu->status) & EDU_STATUS_IRQFACT) {
            qemu_mutex_lock_iothread();
            edu_raise_irq(edu, FACT_IRQ);
            qemu_mutex_unlock_iothread();
        }
    }

    return NULL;
}

static void pci_edu_realize(PCIDevice *pdev, Error **errp)
{
    EduState *edu = DO_UPCAST(EduState, pdev, pdev);
    uint8_t *pci_conf = pdev->config;

    pci_config_set_interrupt_pin(pci_conf, 1);

    if (msi_init(pdev, 0, 1, true, false, errp)) {
        return;
    }

    timer_init_ms(&edu->dma_timer, QEMU_CLOCK_VIRTUAL, edu_dma_timer, edu);

    qemu_mutex_init(&edu->thr_mutex);
    qemu_cond_init(&edu->thr_cond);
    qemu_thread_create(&edu->thread, "edu", edu_fact_thread,
                       edu, QEMU_THREAD_JOINABLE);

    memory_region_init_io(&edu->mmio, OBJECT(edu), &edu_mmio_ops, edu,
                    "edu-mmio", 1 << 20);
    pci_register_bar(pdev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &edu->mmio);
}

static void pci_edu_uninit(PCIDevice *pdev)
{
    EduState *edu = DO_UPCAST(EduState, pdev, pdev);

    qemu_mutex_lock(&edu->thr_mutex);
    edu->stopping = true;
    qemu_mutex_unlock(&edu->thr_mutex);
    qemu_cond_signal(&edu->thr_cond);
    qemu_thread_join(&edu->thread);

    qemu_cond_destroy(&edu->thr_cond);
    qemu_mutex_destroy(&edu->thr_mutex);

    timer_del(&edu->dma_timer);
}

static void edu_obj_uint64(Object *obj, Visitor *v, const char *name,
                           void *opaque, Error **errp)
{
    uint64_t *val = opaque;

    visit_type_uint64(v, name, val, errp);
}

static void edu_instance_init(Object *obj)
{
    EduState *edu = EDU(obj);

    edu->dma_mask = (1UL << 28) - 1;
    object_property_add(obj, "dma_mask", "uint64", edu_obj_uint64,
                    edu_obj_uint64, NULL, &edu->dma_mask, NULL);
}

static void edu_class_init(ObjectClass *class, void *data)
{
    PCIDeviceClass *k = PCI_DEVICE_CLASS(class);

    k->realize = pci_edu_realize;
    k->exit = pci_edu_uninit;
    k->vendor_id = PCI_VENDOR_ID_QEMU;
    k->device_id = 0x11e8;
    k->revision = 0x10;
    k->class_id = PCI_CLASS_OTHERS;
}

static void pci_edu_register_types(void)
{
    static InterfaceInfo interfaces[] = {
        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
        { },
    };
    static const TypeInfo edu_info = {
        .name          = "edu",
        .parent        = TYPE_PCI_DEVICE,
        .instance_size = sizeof(EduState),
        .instance_init = edu_instance_init,
        .class_init    = edu_class_init,
        .interfaces = interfaces,
    };

    type_register_static(&edu_info);
}
type_init(pci_edu_register_types)
Commit	Line	Data
b30934cb JS	1	/*
	2	* QEMU educational PCI device
	3	*
	4	* Copyright (c) 2012-2015 Jiri Slaby
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the "Software"),
	8	* to deal in the Software without restriction, including without limitation
	9	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	10	* and/or sell copies of the Software, and to permit persons to whom the
	11	* Software is furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	19	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	21	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	22	* DEALINGS IN THE SOFTWARE.
	23	*/
	24
0d1c9782	25	#include "qemu/osdep.h"
b30934cb	26	#include "hw/pci/pci.h"
eabb5782	27	#include "hw/pci/msi.h"
b30934cb JS	28	#include "qemu/timer.h"
	29	#include "qemu/main-loop.h" /* iothread mutex */
	30	#include "qapi/visitor.h"
	31
	32	#define EDU(obj) OBJECT_CHECK(EduState, obj, "edu")
	33
	34	#define FACT_IRQ 0x00000001
	35	#define DMA_IRQ 0x00000100
	36
	37	#define DMA_START 0x40000
	38	#define DMA_SIZE 4096
	39
	40	typedef struct {
	41	PCIDevice pdev;
	42	MemoryRegion mmio;
	43
	44	QemuThread thread;
	45	QemuMutex thr_mutex;
	46	QemuCond thr_cond;
	47	bool stopping;
	48
	49	uint32_t addr4;
	50	uint32_t fact;
	51	#define EDU_STATUS_COMPUTING 0x01
	52	#define EDU_STATUS_IRQFACT 0x80
	53	uint32_t status;
	54
	55	uint32_t irq_status;
	56
	57	#define EDU_DMA_RUN 0x1
	58	#define EDU_DMA_DIR(cmd) (((cmd) & 0x2) >> 1)
	59	# define EDU_DMA_FROM_PCI 0
	60	# define EDU_DMA_TO_PCI 1
	61	#define EDU_DMA_IRQ 0x4
	62	struct dma_state {
	63	dma_addr_t src;
	64	dma_addr_t dst;
	65	dma_addr_t cnt;
	66	dma_addr_t cmd;
	67	} dma;
	68	QEMUTimer dma_timer;
	69	char dma_buf[DMA_SIZE];
	70	uint64_t dma_mask;
	71	} EduState;
	72
eabb5782 PX	73	static bool edu_msi_enabled(EduState *edu)
	74	{
	75	return msi_enabled(&edu->pdev);
	76	}
	77
b30934cb JS	78	static void edu_raise_irq(EduState *edu, uint32_t val)
	79	{
	80	edu->irq_status \|= val;
	81	if (edu->irq_status) {
eabb5782 PX	82	if (edu_msi_enabled(edu)) {
	83	msi_notify(&edu->pdev, 0);
	84	} else {
	85	pci_set_irq(&edu->pdev, 1);
	86	}
b30934cb JS	87	}
	88	}
	89
	90	static void edu_lower_irq(EduState *edu, uint32_t val)
	91	{
	92	edu->irq_status &= ~val;
	93
eabb5782	94	if (!edu->irq_status && !edu_msi_enabled(edu)) {
b30934cb JS	95	pci_set_irq(&edu->pdev, 0);
	96	}
	97	}
	98
	99	static bool within(uint32_t addr, uint32_t start, uint32_t end)
	100	{
	101	return start <= addr && addr < end;
	102	}
	103
	104	static void edu_check_range(uint32_t addr, uint32_t size1, uint32_t start,
	105	uint32_t size2)
	106	{
	107	uint32_t end1 = addr + size1;
	108	uint32_t end2 = start + size2;
	109
	110	if (within(addr, start, end2) &&
	111	end1 > addr && within(end1, start, end2)) {
	112	return;
	113	}
	114
	115	hw_error("EDU: DMA range 0x%.8x-0x%.8x out of bounds (0x%.8x-0x%.8x)!",
	116	addr, end1 - 1, start, end2 - 1);
	117	}
	118
	119	static dma_addr_t edu_clamp_addr(const EduState *edu, dma_addr_t addr)
	120	{
	121	dma_addr_t res = addr & edu->dma_mask;
	122
	123	if (addr != res) {
	124	printf("EDU: clamping DMA %#.16"PRIx64" to %#.16"PRIx64"!\n", addr, res);
	125	}
	126
	127	return res;
	128	}
	129
	130	static void edu_dma_timer(void *opaque)
	131	{
	132	EduState *edu = opaque;
	133	bool raise_irq = false;
	134
	135	if (!(edu->dma.cmd & EDU_DMA_RUN)) {
	136	return;
	137	}
	138
	139	if (EDU_DMA_DIR(edu->dma.cmd) == EDU_DMA_FROM_PCI) {
	140	uint32_t dst = edu->dma.dst;
	141	edu_check_range(dst, edu->dma.cnt, DMA_START, DMA_SIZE);
	142	dst -= DMA_START;
	143	pci_dma_read(&edu->pdev, edu_clamp_addr(edu, edu->dma.src),
	144	edu->dma_buf + dst, edu->dma.cnt);
	145	} else {
	146	uint32_t src = edu->dma.src;
	147	edu_check_range(src, edu->dma.cnt, DMA_START, DMA_SIZE);
	148	src -= DMA_START;
	149	pci_dma_write(&edu->pdev, edu_clamp_addr(edu, edu->dma.dst),
	150	edu->dma_buf + src, edu->dma.cnt);
	151	}
	152
	153	edu->dma.cmd &= ~EDU_DMA_RUN;
	154	if (edu->dma.cmd & EDU_DMA_IRQ) {
	155	raise_irq = true;
	156	}
	157
	158	if (raise_irq) {
159	edu_raise_irq(edu, DMA_IRQ);
160	}
161	}
162
163	static void dma_rw(EduState edu, bool write, dma_addr_t val, dma_addr_t *dma,
164	bool timer)
165	{
166	if (write && (edu->dma.cmd & EDU_DMA_RUN)) {
167	return;
168	}
169
170	if (write) {
171	dma = val;
172	} else {
173	val = dma;
174	}
175
176	if (timer) {
177	timer_mod(&edu->dma_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 100);
178	}
179	}
180
181	static uint64_t edu_mmio_read(void *opaque, hwaddr addr, unsigned size)
182	{
183	EduState *edu = opaque;
184	uint64_t val = ~0ULL;
185
186	if (size != 4) {
187	return val;
188	}
189
190	switch (addr) {
191	case 0x00:
192	val = 0x010000edu;
193	break;
194	case 0x04:
195	val = edu->addr4;
196	break;
197	case 0x08:
198	qemu_mutex_lock(&edu->thr_mutex);
199	val = edu->fact;
200	qemu_mutex_unlock(&edu->thr_mutex);
201	break;
202	case 0x20:
203	val = atomic_read(&edu->status);
204	break;
205	case 0x24:
206	val = edu->irq_status;
207	break;
208	case 0x80:
209	dma_rw(edu, false, &val, &edu->dma.src, false);
210	break;
211	case 0x88:
212	dma_rw(edu, false, &val, &edu->dma.dst, false);
213	break;
214	case 0x90:
215	dma_rw(edu, false, &val, &edu->dma.cnt, false);
216	break;
217	case 0x98:
218	dma_rw(edu, false, &val, &edu->dma.cmd, false);
219	break;
220	}
221
222	return val;
223	}
224
225	static void edu_mmio_write(void *opaque, hwaddr addr, uint64_t val,
226	unsigned size)
227	{
228	EduState *edu = opaque;
229
230	if (addr < 0x80 && size != 4) {
231	return;
232	}
233
234	if (addr >= 0x80 && size != 4 && size != 8) {
235	return;
236	}
237
238	switch (addr) {
239	case 0x04:
240	edu->addr4 = ~val;
241	break;
242	case 0x08:
243	if (atomic_read(&edu->status) & EDU_STATUS_COMPUTING) {
244	break;
245	}
246	/* EDU_STATUS_COMPUTING cannot go 0->1 concurrently, because it is only
247	* set in this function and it is under the iothread mutex.
248	*/
249	qemu_mutex_lock(&edu->thr_mutex);
250	edu->fact = val;
251	atomic_or(&edu->status, EDU_STATUS_COMPUTING);
252	qemu_cond_signal(&edu->thr_cond);
253	qemu_mutex_unlock(&edu->thr_mutex);
254	break;
255	case 0x20:
256	if (val & EDU_STATUS_IRQFACT) {
257	atomic_or(&edu->status, EDU_STATUS_IRQFACT);
258	} else {
259	atomic_and(&edu->status, ~EDU_STATUS_IRQFACT);
260	}
261	break;
262	case 0x60:
263	edu_raise_irq(edu, val);
264	break;
265	case 0x64:
266	edu_lower_irq(edu, val);
267	break;
268	case 0x80:
269	dma_rw(edu, true, &val, &edu->dma.src, false);
270	break;
271	case 0x88:
272	dma_rw(edu, true, &val, &edu->dma.dst, false);
273	break;
274	case 0x90:
275	dma_rw(edu, true, &val, &edu->dma.cnt, false);
276	break;
277	case 0x98:
278	if (!(val & EDU_DMA_RUN)) {
279	break;
280	}
281	dma_rw(edu, true, &val, &edu->dma.cmd, true);
282	break;
283	}
284	}
285
286	static const MemoryRegionOps edu_mmio_ops = {
287	.read = edu_mmio_read,
288	.write = edu_mmio_write,
289	.endianness = DEVICE_NATIVE_ENDIAN,
290	};
291
292	/*
631b22ea	293	* We purposely use a thread, so that users are forced to wait for the status
b30934cb JS	294	* register.
	295	*/
	296	static void edu_fact_thread(void opaque)
	297	{
	298	EduState *edu = opaque;
	299
	300	while (1) {
	301	uint32_t val, ret = 1;
	302
	303	qemu_mutex_lock(&edu->thr_mutex);
	304	while ((atomic_read(&edu->status) & EDU_STATUS_COMPUTING) == 0 &&
	305	!edu->stopping) {
	306	qemu_cond_wait(&edu->thr_cond, &edu->thr_mutex);
	307	}
	308
	309	if (edu->stopping) {
	310	qemu_mutex_unlock(&edu->thr_mutex);
	311	break;
	312	}
	313
	314	val = edu->fact;
	315	qemu_mutex_unlock(&edu->thr_mutex);
	316
	317	while (val > 0) {
	318	ret *= val--;
	319	}
	320
	321	/*
	322	* We should sleep for a random period here, so that students are
	323	* forced to check the status properly.
	324	*/
	325
	326	qemu_mutex_lock(&edu->thr_mutex);
	327	edu->fact = ret;
	328	qemu_mutex_unlock(&edu->thr_mutex);
	329	atomic_and(&edu->status, ~EDU_STATUS_COMPUTING);
	330
	331	if (atomic_read(&edu->status) & EDU_STATUS_IRQFACT) {
	332	qemu_mutex_lock_iothread();
	333	edu_raise_irq(edu, FACT_IRQ);
	334	qemu_mutex_unlock_iothread();
	335	}
	336	}
	337
	338	return NULL;
	339	}
	340
f922254c	341	static void pci_edu_realize(PCIDevice pdev, Error *errp)
b30934cb JS	342	{
	343	EduState *edu = DO_UPCAST(EduState, pdev, pdev);
	344	uint8_t *pci_conf = pdev->config;
	345
c25a67f0 PB	346	pci_config_set_interrupt_pin(pci_conf, 1);
	347
	348	if (msi_init(pdev, 0, 1, true, false, errp)) {
	349	return;
	350	}
	351
b30934cb JS	352	timer_init_ms(&edu->dma_timer, QEMU_CLOCK_VIRTUAL, edu_dma_timer, edu);
	353
	354	qemu_mutex_init(&edu->thr_mutex);
	355	qemu_cond_init(&edu->thr_cond);
	356	qemu_thread_create(&edu->thread, "edu", edu_fact_thread,
	357	edu, QEMU_THREAD_JOINABLE);
	358
b30934cb JS	359	memory_region_init_io(&edu->mmio, OBJECT(edu), &edu_mmio_ops, edu,
	360	"edu-mmio", 1 << 20);
	361	pci_register_bar(pdev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &edu->mmio);
b30934cb JS	362	}
	363
	364	static void pci_edu_uninit(PCIDevice *pdev)
	365	{
	366	EduState *edu = DO_UPCAST(EduState, pdev, pdev);
	367
	368	qemu_mutex_lock(&edu->thr_mutex);
	369	edu->stopping = true;
	370	qemu_mutex_unlock(&edu->thr_mutex);
	371	qemu_cond_signal(&edu->thr_cond);
	372	qemu_thread_join(&edu->thread);
	373
	374	qemu_cond_destroy(&edu->thr_cond);
	375	qemu_mutex_destroy(&edu->thr_mutex);
	376
	377	timer_del(&edu->dma_timer);
	378	}
	379
d7bce999 EB	380	static void edu_obj_uint64(Object obj, Visitor v, const char *name,
d7bce999 EB	381	void opaque, Error *errp)
b30934cb JS	382	{
	383	uint64_t *val = opaque;
	384
51e72bc1	385	visit_type_uint64(v, name, val, errp);
b30934cb JS	386	}
	387
	388	static void edu_instance_init(Object *obj)
	389	{
	390	EduState *edu = EDU(obj);
	391
	392	edu->dma_mask = (1UL << 28) - 1;
	393	object_property_add(obj, "dma_mask", "uint64", edu_obj_uint64,
	394	edu_obj_uint64, NULL, &edu->dma_mask, NULL);
	395	}
	396
	397	static void edu_class_init(ObjectClass class, void data)
	398	{
	399	PCIDeviceClass *k = PCI_DEVICE_CLASS(class);
	400
f922254c	401	k->realize = pci_edu_realize;
b30934cb JS	402	k->exit = pci_edu_uninit;
	403	k->vendor_id = PCI_VENDOR_ID_QEMU;
	404	k->device_id = 0x11e8;
	405	k->revision = 0x10;
	406	k->class_id = PCI_CLASS_OTHERS;
	407	}
	408
	409	static void pci_edu_register_types(void)
	410	{
fd3b02c8 EH	411	static InterfaceInfo interfaces[] = {
	412	{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
	413	{ },
	414	};
b30934cb JS	415	static const TypeInfo edu_info = {
	416	.name = "edu",
	417	.parent = TYPE_PCI_DEVICE,
	418	.instance_size = sizeof(EduState),
	419	.instance_init = edu_instance_init,
	420	.class_init = edu_class_init,
fd3b02c8	421	.interfaces = interfaces,
b30934cb JS	422	};
	423
	424	type_register_static(&edu_info);
	425	}
	426	type_init(pci_edu_register_types)