[deliverable/linux.git] / drivers / gpu / drm / amd / amdkfd / kfd_device.c

/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 <linux/amd-iommu.h>
#include <linux/bsearch.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include "kfd_priv.h"
#include "kfd_device_queue_manager.h"

#define MQD_SIZE_ALIGNED 768

static const struct kfd_device_info kaveri_device_info = {
	.max_pasid_bits = 16,
	.ih_ring_entry_size = 4 * sizeof(uint32_t),
	.mqd_size_aligned = MQD_SIZE_ALIGNED
};

struct kfd_deviceid {
	unsigned short did;
	const struct kfd_device_info *device_info;
};

/* Please keep this sorted by increasing device id. */
static const struct kfd_deviceid supported_devices[] = {
	{ 0x1304, &kaveri_device_info },	/* Kaveri */
	{ 0x1305, &kaveri_device_info },	/* Kaveri */
	{ 0x1306, &kaveri_device_info },	/* Kaveri */
	{ 0x1307, &kaveri_device_info },	/* Kaveri */
	{ 0x1309, &kaveri_device_info },	/* Kaveri */
	{ 0x130A, &kaveri_device_info },	/* Kaveri */
	{ 0x130B, &kaveri_device_info },	/* Kaveri */
	{ 0x130C, &kaveri_device_info },	/* Kaveri */
	{ 0x130D, &kaveri_device_info },	/* Kaveri */
	{ 0x130E, &kaveri_device_info },	/* Kaveri */
	{ 0x130F, &kaveri_device_info },	/* Kaveri */
	{ 0x1310, &kaveri_device_info },	/* Kaveri */
	{ 0x1311, &kaveri_device_info },	/* Kaveri */
	{ 0x1312, &kaveri_device_info },	/* Kaveri */
	{ 0x1313, &kaveri_device_info },	/* Kaveri */
	{ 0x1315, &kaveri_device_info },	/* Kaveri */
	{ 0x1316, &kaveri_device_info },	/* Kaveri */
	{ 0x1317, &kaveri_device_info },	/* Kaveri */
	{ 0x1318, &kaveri_device_info },	/* Kaveri */
	{ 0x131B, &kaveri_device_info },	/* Kaveri */
	{ 0x131C, &kaveri_device_info },	/* Kaveri */
	{ 0x131D, &kaveri_device_info },	/* Kaveri */
};

static const struct kfd_device_info *lookup_device_info(unsigned short did)
{
	size_t i;

	for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
		if (supported_devices[i].did == did) {
			BUG_ON(supported_devices[i].device_info == NULL);
			return supported_devices[i].device_info;
		}
	}

	return NULL;
}

struct kfd_dev *kgd2kfd_probe(struct kgd_dev *kgd, struct pci_dev *pdev)
{
	struct kfd_dev *kfd;

	const struct kfd_device_info *device_info =
					lookup_device_info(pdev->device);

	if (!device_info)
		return NULL;

	kfd = kzalloc(sizeof(*kfd), GFP_KERNEL);
	if (!kfd)
		return NULL;

	kfd->kgd = kgd;
	kfd->device_info = device_info;
	kfd->pdev = pdev;
	kfd->init_complete = false;

	return kfd;
}

static bool device_iommu_pasid_init(struct kfd_dev *kfd)
{
	const u32 required_iommu_flags = AMD_IOMMU_DEVICE_FLAG_ATS_SUP |
					AMD_IOMMU_DEVICE_FLAG_PRI_SUP |
					AMD_IOMMU_DEVICE_FLAG_PASID_SUP;

	struct amd_iommu_device_info iommu_info;
	unsigned int pasid_limit;
	int err;

	err = amd_iommu_device_info(kfd->pdev, &iommu_info);
	if (err < 0) {
		dev_err(kfd_device,
			"error getting iommu info. is the iommu enabled?\n");
		return false;
	}

	if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags) {
		dev_err(kfd_device, "error required iommu flags ats(%i), pri(%i), pasid(%i)\n",
		       (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP) != 0,
		       (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) != 0,
		       (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP) != 0);
		return false;
	}

	pasid_limit = min_t(unsigned int,
			(unsigned int)1 << kfd->device_info->max_pasid_bits,
			iommu_info.max_pasids);
	/*
	 * last pasid is used for kernel queues doorbells
	 * in the future the last pasid might be used for a kernel thread.
	 */
	pasid_limit = min_t(unsigned int,
				pasid_limit,
				kfd->doorbell_process_limit - 1);

	err = amd_iommu_init_device(kfd->pdev, pasid_limit);
	if (err < 0) {
		dev_err(kfd_device, "error initializing iommu device\n");
		return false;
	}

	if (!kfd_set_pasid_limit(pasid_limit)) {
		dev_err(kfd_device, "error setting pasid limit\n");
		amd_iommu_free_device(kfd->pdev);
		return false;
	}

	return true;
}

static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, int pasid)
{
	struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);

	if (dev)
		kfd_unbind_process_from_device(dev, pasid);
}

bool kgd2kfd_device_init(struct kfd_dev *kfd,
			 const struct kgd2kfd_shared_resources *gpu_resources)
{
	unsigned int size;

	kfd->shared_resources = *gpu_resources;

	/* calculate max size of mqds needed for queues */
	size = max_num_of_processes *
		max_num_of_queues_per_process *
		kfd->device_info->mqd_size_aligned;

	/* add another 512KB for all other allocations on gart */
	size += 512 * 1024;

	if (kfd2kgd->init_sa_manager(kfd->kgd, size)) {
		dev_err(kfd_device,
			"Error initializing sa manager for device (%x:%x)\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto out;
	}

	kfd_doorbell_init(kfd);

	if (kfd_topology_add_device(kfd) != 0) {
		dev_err(kfd_device,
			"Error adding device (%x:%x) to topology\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto kfd_topology_add_device_error;
	}

	if (kfd_interrupt_init(kfd)) {
		dev_err(kfd_device,
			"Error initializing interrupts for device (%x:%x)\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto kfd_interrupt_error;
	}

	if (!device_iommu_pasid_init(kfd)) {
		dev_err(kfd_device,
			"Error initializing iommuv2 for device (%x:%x)\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto device_iommu_pasid_error;
	}
	amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
						iommu_pasid_shutdown_callback);

	kfd->dqm = device_queue_manager_init(kfd);
	if (!kfd->dqm) {
		dev_err(kfd_device,
			"Error initializing queue manager for device (%x:%x)\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto device_queue_manager_error;
	}

	if (kfd->dqm->start(kfd->dqm) != 0) {
		dev_err(kfd_device,
			"Error starting queuen manager for device (%x:%x)\n",
			kfd->pdev->vendor, kfd->pdev->device);
		goto dqm_start_error;
	}

	kfd->init_complete = true;
	dev_info(kfd_device, "added device (%x:%x)\n", kfd->pdev->vendor,
		 kfd->pdev->device);

	pr_debug("kfd: Starting kfd with the following scheduling policy %d\n",
		sched_policy);

	goto out;

dqm_start_error:
	device_queue_manager_uninit(kfd->dqm);
device_queue_manager_error:
	amd_iommu_free_device(kfd->pdev);
device_iommu_pasid_error:
	kfd_interrupt_exit(kfd);
kfd_interrupt_error:
	kfd_topology_remove_device(kfd);
kfd_topology_add_device_error:
	kfd2kgd->fini_sa_manager(kfd->kgd);
	dev_err(kfd_device,
		"device (%x:%x) NOT added due to errors\n",
		kfd->pdev->vendor, kfd->pdev->device);
out:
	return kfd->init_complete;
}

void kgd2kfd_device_exit(struct kfd_dev *kfd)
{
	if (kfd->init_complete) {
		device_queue_manager_uninit(kfd->dqm);
		amd_iommu_free_device(kfd->pdev);
		kfd_interrupt_exit(kfd);
		kfd_topology_remove_device(kfd);
	}

	kfree(kfd);
}

void kgd2kfd_suspend(struct kfd_dev *kfd)
{
	BUG_ON(kfd == NULL);

	if (kfd->init_complete) {
		kfd->dqm->stop(kfd->dqm);
		amd_iommu_free_device(kfd->pdev);
	}
}

int kgd2kfd_resume(struct kfd_dev *kfd)
{
	unsigned int pasid_limit;
	int err;

	BUG_ON(kfd == NULL);

	pasid_limit = kfd_get_pasid_limit();

	if (kfd->init_complete) {
		err = amd_iommu_init_device(kfd->pdev, pasid_limit);
		if (err < 0)
			return -ENXIO;
		amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
						iommu_pasid_shutdown_callback);
		kfd->dqm->start(kfd->dqm);
	}

	return 0;
}

/* This is called directly from KGD at ISR. */
void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
{
	if (kfd->init_complete) {
		spin_lock(&kfd->interrupt_lock);

		if (kfd->interrupts_active
		    && enqueue_ih_ring_entry(kfd, ih_ring_entry))
			schedule_work(&kfd->interrupt_work);

		spin_unlock(&kfd->interrupt_lock);
	}
}
Commit	Line	Data
4a488a7a OG	1	/*
	2	* Copyright 2014 Advanced Micro Devices, Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*/
	22
	23	#include <linux/amd-iommu.h>
	24	#include <linux/bsearch.h>
	25	#include <linux/pci.h>
	26	#include <linux/slab.h>
	27	#include "kfd_priv.h"
64c7f8cf	28	#include "kfd_device_queue_manager.h"
4a488a7a	29
19f6d2a6 OG	30	#define MQD_SIZE_ALIGNED 768
19f6d2a6 OG	31
4a488a7a OG	32	static const struct kfd_device_info kaveri_device_info = {
4a488a7a OG	33	.max_pasid_bits = 16,
b3f5e6b4	34	.ih_ring_entry_size = 4 * sizeof(uint32_t),
19f6d2a6	35	.mqd_size_aligned = MQD_SIZE_ALIGNED
4a488a7a OG	36	};
	37
	38	struct kfd_deviceid {
	39	unsigned short did;
	40	const struct kfd_device_info *device_info;
	41	};
	42
	43	/* Please keep this sorted by increasing device id. */
	44	static const struct kfd_deviceid supported_devices[] = {
	45	{ 0x1304, &kaveri_device_info }, /* Kaveri */
	46	{ 0x1305, &kaveri_device_info }, /* Kaveri */
	47	{ 0x1306, &kaveri_device_info }, /* Kaveri */
	48	{ 0x1307, &kaveri_device_info }, /* Kaveri */
	49	{ 0x1309, &kaveri_device_info }, /* Kaveri */
	50	{ 0x130A, &kaveri_device_info }, /* Kaveri */
	51	{ 0x130B, &kaveri_device_info }, /* Kaveri */
	52	{ 0x130C, &kaveri_device_info }, /* Kaveri */
	53	{ 0x130D, &kaveri_device_info }, /* Kaveri */
	54	{ 0x130E, &kaveri_device_info }, /* Kaveri */
	55	{ 0x130F, &kaveri_device_info }, /* Kaveri */
	56	{ 0x1310, &kaveri_device_info }, /* Kaveri */
	57	{ 0x1311, &kaveri_device_info }, /* Kaveri */
	58	{ 0x1312, &kaveri_device_info }, /* Kaveri */
	59	{ 0x1313, &kaveri_device_info }, /* Kaveri */
	60	{ 0x1315, &kaveri_device_info }, /* Kaveri */
	61	{ 0x1316, &kaveri_device_info }, /* Kaveri */
	62	{ 0x1317, &kaveri_device_info }, /* Kaveri */
	63	{ 0x1318, &kaveri_device_info }, /* Kaveri */
	64	{ 0x131B, &kaveri_device_info }, /* Kaveri */
	65	{ 0x131C, &kaveri_device_info }, /* Kaveri */
	66	{ 0x131D, &kaveri_device_info }, /* Kaveri */
	67	};
	68
	69	static const struct kfd_device_info *lookup_device_info(unsigned short did)
	70	{
	71	size_t i;
	72
	73	for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
	74	if (supported_devices[i].did == did) {
	75	BUG_ON(supported_devices[i].device_info == NULL);
	76	return supported_devices[i].device_info;
	77	}
	78	}
	79
	80	return NULL;
	81	}
	82
	83	struct kfd_dev kgd2kfd_probe(struct kgd_dev kgd, struct pci_dev *pdev)
	84	{
	85	struct kfd_dev *kfd;
	86
	87	const struct kfd_device_info *device_info =
	88	lookup_device_info(pdev->device);
	89
	90	if (!device_info)
	91	return NULL;
	92
	93	kfd = kzalloc(sizeof(*kfd), GFP_KERNEL);
	94	if (!kfd)
	95	return NULL;
	96
	97	kfd->kgd = kgd;
	98	kfd->device_info = device_info;
	99	kfd->pdev = pdev;
19f6d2a6	100	kfd->init_complete = false;
4a488a7a OG	101
	102	return kfd;
	103	}
	104
b17f068a OG	105	static bool device_iommu_pasid_init(struct kfd_dev *kfd)
	106	{
	107	const u32 required_iommu_flags = AMD_IOMMU_DEVICE_FLAG_ATS_SUP \|
	108	AMD_IOMMU_DEVICE_FLAG_PRI_SUP \|
	109	AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
	110
	111	struct amd_iommu_device_info iommu_info;
	112	unsigned int pasid_limit;
	113	int err;
	114
	115	err = amd_iommu_device_info(kfd->pdev, &iommu_info);
	116	if (err < 0) {
	117	dev_err(kfd_device,
	118	"error getting iommu info. is the iommu enabled?\n");
	119	return false;
	120	}
	121
	122	if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags) {
	123	dev_err(kfd_device, "error required iommu flags ats(%i), pri(%i), pasid(%i)\n",
	124	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP) != 0,
	125	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) != 0,
	126	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP) != 0);
	127	return false;
	128	}
	129
	130	pasid_limit = min_t(unsigned int,
	131	(unsigned int)1 << kfd->device_info->max_pasid_bits,
	132	iommu_info.max_pasids);
	133	/*
	134	* last pasid is used for kernel queues doorbells
	135	* in the future the last pasid might be used for a kernel thread.
	136	*/
	137	pasid_limit = min_t(unsigned int,
	138	pasid_limit,
	139	kfd->doorbell_process_limit - 1);
	140
	141	err = amd_iommu_init_device(kfd->pdev, pasid_limit);
	142	if (err < 0) {
	143	dev_err(kfd_device, "error initializing iommu device\n");
	144	return false;
	145	}
	146
	147	if (!kfd_set_pasid_limit(pasid_limit)) {
	148	dev_err(kfd_device, "error setting pasid limit\n");
	149	amd_iommu_free_device(kfd->pdev);
	150	return false;
	151	}
	152
	153	return true;
	154	}
	155
	156	static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, int pasid)
	157	{
	158	struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);
	159
	160	if (dev)
	161	kfd_unbind_process_from_device(dev, pasid);
	162	}
	163
4a488a7a OG	164	bool kgd2kfd_device_init(struct kfd_dev *kfd,
	165	const struct kgd2kfd_shared_resources *gpu_resources)
	166	{
19f6d2a6 OG	167	unsigned int size;
19f6d2a6 OG	168
4a488a7a OG	169	kfd->shared_resources = *gpu_resources;
4a488a7a OG	170
19f6d2a6 OG	171	/* calculate max size of mqds needed for queues */
	172	size = max_num_of_processes *
	173	max_num_of_queues_per_process *
	174	kfd->device_info->mqd_size_aligned;
	175
	176	/* add another 512KB for all other allocations on gart */
	177	size += 512 * 1024;
	178
	179	if (kfd2kgd->init_sa_manager(kfd->kgd, size)) {
	180	dev_err(kfd_device,
	181	"Error initializing sa manager for device (%x:%x)\n",
	182	kfd->pdev->vendor, kfd->pdev->device);
	183	goto out;
	184	}
	185
	186	kfd_doorbell_init(kfd);
	187
	188	if (kfd_topology_add_device(kfd) != 0) {
	189	dev_err(kfd_device,
	190	"Error adding device (%x:%x) to topology\n",
	191	kfd->pdev->vendor, kfd->pdev->device);
	192	goto kfd_topology_add_device_error;
	193	}
	194
b3f5e6b4 AL	195	if (kfd_interrupt_init(kfd)) {
	196	dev_err(kfd_device,
	197	"Error initializing interrupts for device (%x:%x)\n",
	198	kfd->pdev->vendor, kfd->pdev->device);
	199	goto kfd_interrupt_error;
	200	}
	201
b17f068a OG	202	if (!device_iommu_pasid_init(kfd)) {
	203	dev_err(kfd_device,
	204	"Error initializing iommuv2 for device (%x:%x)\n",
	205	kfd->pdev->vendor, kfd->pdev->device);
	206	goto device_iommu_pasid_error;
	207	}
	208	amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
	209	iommu_pasid_shutdown_callback);
5b5c4e40	210
64c7f8cf BG	211	kfd->dqm = device_queue_manager_init(kfd);
	212	if (!kfd->dqm) {
	213	dev_err(kfd_device,
	214	"Error initializing queue manager for device (%x:%x)\n",
	215	kfd->pdev->vendor, kfd->pdev->device);
	216	goto device_queue_manager_error;
	217	}
	218
	219	if (kfd->dqm->start(kfd->dqm) != 0) {
	220	dev_err(kfd_device,
	221	"Error starting queuen manager for device (%x:%x)\n",
	222	kfd->pdev->vendor, kfd->pdev->device);
	223	goto dqm_start_error;
	224	}
	225
4a488a7a OG	226	kfd->init_complete = true;
	227	dev_info(kfd_device, "added device (%x:%x)\n", kfd->pdev->vendor,
	228	kfd->pdev->device);
	229
64c7f8cf BG	230	pr_debug("kfd: Starting kfd with the following scheduling policy %d\n",
	231	sched_policy);
	232
19f6d2a6 OG	233	goto out;
19f6d2a6 OG	234
64c7f8cf BG	235	dqm_start_error:
	236	device_queue_manager_uninit(kfd->dqm);
	237	device_queue_manager_error:
	238	amd_iommu_free_device(kfd->pdev);
b17f068a	239	device_iommu_pasid_error:
b3f5e6b4 AL	240	kfd_interrupt_exit(kfd);
b3f5e6b4 AL	241	kfd_interrupt_error:
b17f068a	242	kfd_topology_remove_device(kfd);
19f6d2a6 OG	243	kfd_topology_add_device_error:
	244	kfd2kgd->fini_sa_manager(kfd->kgd);
	245	dev_err(kfd_device,
	246	"device (%x:%x) NOT added due to errors\n",
	247	kfd->pdev->vendor, kfd->pdev->device);
	248	out:
	249	return kfd->init_complete;
4a488a7a OG	250	}
	251
	252	void kgd2kfd_device_exit(struct kfd_dev *kfd)
	253	{
b17f068a	254	if (kfd->init_complete) {
64c7f8cf	255	device_queue_manager_uninit(kfd->dqm);
b17f068a	256	amd_iommu_free_device(kfd->pdev);
b3f5e6b4	257	kfd_interrupt_exit(kfd);
b17f068a OG	258	kfd_topology_remove_device(kfd);
b17f068a OG	259	}
5b5c4e40	260
4a488a7a OG	261	kfree(kfd);
	262	}
	263
	264	void kgd2kfd_suspend(struct kfd_dev *kfd)
	265	{
	266	BUG_ON(kfd == NULL);
b17f068a	267
64c7f8cf BG	268	if (kfd->init_complete) {
64c7f8cf BG	269	kfd->dqm->stop(kfd->dqm);
b17f068a	270	amd_iommu_free_device(kfd->pdev);
64c7f8cf	271	}
4a488a7a OG	272	}
	273
	274	int kgd2kfd_resume(struct kfd_dev *kfd)
	275	{
b17f068a OG	276	unsigned int pasid_limit;
	277	int err;
	278
4a488a7a OG	279	BUG_ON(kfd == NULL);
4a488a7a OG	280
b17f068a OG	281	pasid_limit = kfd_get_pasid_limit();
	282
	283	if (kfd->init_complete) {
	284	err = amd_iommu_init_device(kfd->pdev, pasid_limit);
	285	if (err < 0)
	286	return -ENXIO;
	287	amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
	288	iommu_pasid_shutdown_callback);
64c7f8cf	289	kfd->dqm->start(kfd->dqm);
b17f068a OG	290	}
b17f068a OG	291
4a488a7a OG	292	return 0;
	293	}
	294
b3f5e6b4 AL	295	/* This is called directly from KGD at ISR. */
b3f5e6b4 AL	296	void kgd2kfd_interrupt(struct kfd_dev kfd, const void ih_ring_entry)
4a488a7a	297	{
b3f5e6b4 AL	298	if (kfd->init_complete) {
	299	spin_lock(&kfd->interrupt_lock);
	300
	301	if (kfd->interrupts_active
	302	&& enqueue_ih_ring_entry(kfd, ih_ring_entry))
	303	schedule_work(&kfd->interrupt_work);
	304
	305	spin_unlock(&kfd->interrupt_lock);
	306	}
4a488a7a	307	}