[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"
#include "kfd_pm4_headers.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),
	.num_of_watch_points = 4,
	.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 int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
				unsigned int chunk_size);
static void kfd_gtt_sa_fini(struct kfd_dev *kfd);

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;

	/*
	 * calculate max size of runlist packet.
	 * There can be only 2 packets at once
	 */
	size += (max_num_of_processes * sizeof(struct pm4_map_process) +
		max_num_of_processes * max_num_of_queues_per_process *
		sizeof(struct pm4_map_queues) + sizeof(struct pm4_runlist)) * 2;

	/* Add size of HIQ & DIQ */
	size += KFD_KERNEL_QUEUE_SIZE * 2;

	/* add another 512KB for all other allocations on gart (HPD, fences) */
	size += 512 * 1024;

	if (kfd2kgd->init_sa_manager(kfd->kgd, size)) {
		dev_err(kfd_device,
			"Could not allocate %d bytes for device (%x:%x)\n",
			size, kfd->pdev->vendor, kfd->pdev->device);
		goto out;
	}

	dev_info(kfd_device,
		"Allocated %d bytes on gart for device(%x:%x)\n",
		size, kfd->pdev->vendor, kfd->pdev->device);

	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_set_invalidate_ctx_cb(kfd->pdev, NULL);
		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);
	}
}

static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
				unsigned int chunk_size)
{
	unsigned int num_of_bits;

	BUG_ON(!kfd);
	BUG_ON(!kfd->gtt_mem);
	BUG_ON(buf_size < chunk_size);
	BUG_ON(buf_size == 0);
	BUG_ON(chunk_size == 0);

	kfd->gtt_sa_chunk_size = chunk_size;
	kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;

	num_of_bits = kfd->gtt_sa_num_of_chunks / BITS_PER_BYTE;
	BUG_ON(num_of_bits == 0);

	kfd->gtt_sa_bitmap = kzalloc(num_of_bits, GFP_KERNEL);

	if (!kfd->gtt_sa_bitmap)
		return -ENOMEM;

	pr_debug("kfd: gtt_sa_num_of_chunks = %d, gtt_sa_bitmap = %p\n",
			kfd->gtt_sa_num_of_chunks, kfd->gtt_sa_bitmap);

	mutex_init(&kfd->gtt_sa_lock);

	return 0;

}

static void kfd_gtt_sa_fini(struct kfd_dev *kfd)
{
	mutex_destroy(&kfd->gtt_sa_lock);
	kfree(kfd->gtt_sa_bitmap);
}

static inline uint64_t kfd_gtt_sa_calc_gpu_addr(uint64_t start_addr,
						unsigned int bit_num,
						unsigned int chunk_size)
{
	return start_addr + bit_num * chunk_size;
}

static inline uint32_t *kfd_gtt_sa_calc_cpu_addr(void *start_addr,
						unsigned int bit_num,
						unsigned int chunk_size)
{
	return (uint32_t *) ((uint64_t) start_addr + bit_num * chunk_size);
}

int kfd_gtt_sa_allocate(struct kfd_dev *kfd, unsigned int size,
			struct kfd_mem_obj **mem_obj)
{
	unsigned int found, start_search, cur_size;

	BUG_ON(!kfd);

	if (size == 0)
		return -EINVAL;

	if (size > kfd->gtt_sa_num_of_chunks * kfd->gtt_sa_chunk_size)
		return -ENOMEM;

	*mem_obj = kmalloc(sizeof(struct kfd_mem_obj), GFP_KERNEL);
	if ((*mem_obj) == NULL)
		return -ENOMEM;

	pr_debug("kfd: allocated mem_obj = %p for size = %d\n", *mem_obj, size);

	start_search = 0;

	mutex_lock(&kfd->gtt_sa_lock);

kfd_gtt_restart_search:
	/* Find the first chunk that is free */
	found = find_next_zero_bit(kfd->gtt_sa_bitmap,
					kfd->gtt_sa_num_of_chunks,
					start_search);

	pr_debug("kfd: found = %d\n", found);

	/* If there wasn't any free chunk, bail out */
	if (found == kfd->gtt_sa_num_of_chunks)
		goto kfd_gtt_no_free_chunk;

	/* Update fields of mem_obj */
	(*mem_obj)->range_start = found;
	(*mem_obj)->range_end = found;
	(*mem_obj)->gpu_addr = kfd_gtt_sa_calc_gpu_addr(
					kfd->gtt_start_gpu_addr,
					found,
					kfd->gtt_sa_chunk_size);
	(*mem_obj)->cpu_ptr = kfd_gtt_sa_calc_cpu_addr(
					kfd->gtt_start_cpu_ptr,
					found,
					kfd->gtt_sa_chunk_size);

	pr_debug("kfd: gpu_addr = %p, cpu_addr = %p\n",
			(uint64_t *) (*mem_obj)->gpu_addr, (*mem_obj)->cpu_ptr);

	/* If we need only one chunk, mark it as allocated and get out */
	if (size <= kfd->gtt_sa_chunk_size) {
		pr_debug("kfd: single bit\n");
		set_bit(found, kfd->gtt_sa_bitmap);
		goto kfd_gtt_out;
	}

	/* Otherwise, try to see if we have enough contiguous chunks */
	cur_size = size - kfd->gtt_sa_chunk_size;
	do {
		(*mem_obj)->range_end =
			find_next_zero_bit(kfd->gtt_sa_bitmap,
					kfd->gtt_sa_num_of_chunks, ++found);
		/*
		 * If next free chunk is not contiguous than we need to
		 * restart our search from the last free chunk we found (which
		 * wasn't contiguous to the previous ones
		 */
		if ((*mem_obj)->range_end != found) {
			start_search = found;
			goto kfd_gtt_restart_search;
		}

		/*
		 * If we reached end of buffer, bail out with error
		 */
		if (found == kfd->gtt_sa_num_of_chunks)
			goto kfd_gtt_no_free_chunk;

		/* Check if we don't need another chunk */
		if (cur_size <= kfd->gtt_sa_chunk_size)
			cur_size = 0;
		else
			cur_size -= kfd->gtt_sa_chunk_size;

	} while (cur_size > 0);

	pr_debug("kfd: range_start = %d, range_end = %d\n",
		(*mem_obj)->range_start, (*mem_obj)->range_end);

	/* Mark the chunks as allocated */
	for (found = (*mem_obj)->range_start;
		found <= (*mem_obj)->range_end;
		found++)
		set_bit(found, kfd->gtt_sa_bitmap);

kfd_gtt_out:
	mutex_unlock(&kfd->gtt_sa_lock);
	return 0;

kfd_gtt_no_free_chunk:
	pr_debug("kfd: allocation failed with mem_obj = %p\n", mem_obj);
	mutex_unlock(&kfd->gtt_sa_lock);
	kfree(mem_obj);
	return -ENOMEM;
}

int kfd_gtt_sa_free(struct kfd_dev *kfd, struct kfd_mem_obj *mem_obj)
{
	unsigned int bit;

	BUG_ON(!kfd);
	BUG_ON(!mem_obj);

	pr_debug("kfd: free mem_obj = %p, range_start = %d, range_end = %d\n",
			mem_obj, mem_obj->range_start, mem_obj->range_end);

	mutex_lock(&kfd->gtt_sa_lock);

	/* Mark the chunks as free */
	for (bit = mem_obj->range_start;
		bit <= mem_obj->range_end;
		bit++)
		clear_bit(bit, kfd->gtt_sa_bitmap);

	mutex_unlock(&kfd->gtt_sa_lock);

	kfree(mem_obj);
	return 0;
}
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"
e18e794e	29	#include "kfd_pm4_headers.h"
4a488a7a	30
19f6d2a6 OG	31	#define MQD_SIZE_ALIGNED 768
19f6d2a6 OG	32
4a488a7a OG	33	static const struct kfd_device_info kaveri_device_info = {
4a488a7a OG	34	.max_pasid_bits = 16,
b3f5e6b4	35	.ih_ring_entry_size = 4 * sizeof(uint32_t),
f7c826ad	36	.num_of_watch_points = 4,
19f6d2a6	37	.mqd_size_aligned = MQD_SIZE_ALIGNED
4a488a7a OG	38	};
	39
	40	struct kfd_deviceid {
	41	unsigned short did;
	42	const struct kfd_device_info *device_info;
	43	};
	44
	45	/* Please keep this sorted by increasing device id. */
	46	static const struct kfd_deviceid supported_devices[] = {
	47	{ 0x1304, &kaveri_device_info }, /* Kaveri */
	48	{ 0x1305, &kaveri_device_info }, /* Kaveri */
	49	{ 0x1306, &kaveri_device_info }, /* Kaveri */
	50	{ 0x1307, &kaveri_device_info }, /* Kaveri */
	51	{ 0x1309, &kaveri_device_info }, /* Kaveri */
	52	{ 0x130A, &kaveri_device_info }, /* Kaveri */
	53	{ 0x130B, &kaveri_device_info }, /* Kaveri */
	54	{ 0x130C, &kaveri_device_info }, /* Kaveri */
	55	{ 0x130D, &kaveri_device_info }, /* Kaveri */
	56	{ 0x130E, &kaveri_device_info }, /* Kaveri */
	57	{ 0x130F, &kaveri_device_info }, /* Kaveri */
	58	{ 0x1310, &kaveri_device_info }, /* Kaveri */
	59	{ 0x1311, &kaveri_device_info }, /* Kaveri */
	60	{ 0x1312, &kaveri_device_info }, /* Kaveri */
	61	{ 0x1313, &kaveri_device_info }, /* Kaveri */
	62	{ 0x1315, &kaveri_device_info }, /* Kaveri */
	63	{ 0x1316, &kaveri_device_info }, /* Kaveri */
	64	{ 0x1317, &kaveri_device_info }, /* Kaveri */
	65	{ 0x1318, &kaveri_device_info }, /* Kaveri */
	66	{ 0x131B, &kaveri_device_info }, /* Kaveri */
	67	{ 0x131C, &kaveri_device_info }, /* Kaveri */
	68	{ 0x131D, &kaveri_device_info }, /* Kaveri */
	69	};
	70
6e81090b OG	71	static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
	72	unsigned int chunk_size);
	73	static void kfd_gtt_sa_fini(struct kfd_dev *kfd);
	74
4a488a7a OG	75	static const struct kfd_device_info *lookup_device_info(unsigned short did)
	76	{
	77	size_t i;
	78
	79	for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
	80	if (supported_devices[i].did == did) {
	81	BUG_ON(supported_devices[i].device_info == NULL);
	82	return supported_devices[i].device_info;
	83	}
	84	}
	85
	86	return NULL;
	87	}
	88
	89	struct kfd_dev kgd2kfd_probe(struct kgd_dev kgd, struct pci_dev *pdev)
	90	{
	91	struct kfd_dev *kfd;
	92
	93	const struct kfd_device_info *device_info =
	94	lookup_device_info(pdev->device);
	95
	96	if (!device_info)
	97	return NULL;
	98
	99	kfd = kzalloc(sizeof(*kfd), GFP_KERNEL);
	100	if (!kfd)
	101	return NULL;
	102
	103	kfd->kgd = kgd;
	104	kfd->device_info = device_info;
	105	kfd->pdev = pdev;
19f6d2a6	106	kfd->init_complete = false;
4a488a7a OG	107
	108	return kfd;
	109	}
	110
b17f068a OG	111	static bool device_iommu_pasid_init(struct kfd_dev *kfd)
	112	{
	113	const u32 required_iommu_flags = AMD_IOMMU_DEVICE_FLAG_ATS_SUP \|
	114	AMD_IOMMU_DEVICE_FLAG_PRI_SUP \|
	115	AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
	116
	117	struct amd_iommu_device_info iommu_info;
	118	unsigned int pasid_limit;
	119	int err;
	120
	121	err = amd_iommu_device_info(kfd->pdev, &iommu_info);
	122	if (err < 0) {
	123	dev_err(kfd_device,
	124	"error getting iommu info. is the iommu enabled?\n");
	125	return false;
	126	}
	127
	128	if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags) {
	129	dev_err(kfd_device, "error required iommu flags ats(%i), pri(%i), pasid(%i)\n",
	130	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP) != 0,
	131	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) != 0,
	132	(iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP) != 0);
	133	return false;
	134	}
	135
	136	pasid_limit = min_t(unsigned int,
	137	(unsigned int)1 << kfd->device_info->max_pasid_bits,
	138	iommu_info.max_pasids);
	139	/*
	140	* last pasid is used for kernel queues doorbells
	141	* in the future the last pasid might be used for a kernel thread.
	142	*/
	143	pasid_limit = min_t(unsigned int,
	144	pasid_limit,
	145	kfd->doorbell_process_limit - 1);
	146
	147	err = amd_iommu_init_device(kfd->pdev, pasid_limit);
	148	if (err < 0) {
	149	dev_err(kfd_device, "error initializing iommu device\n");
	150	return false;
	151	}
	152
	153	if (!kfd_set_pasid_limit(pasid_limit)) {
	154	dev_err(kfd_device, "error setting pasid limit\n");
	155	amd_iommu_free_device(kfd->pdev);
	156	return false;
	157	}
	158
	159	return true;
	160	}
	161
	162	static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, int pasid)
	163	{
	164	struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);
	165
	166	if (dev)
	167	kfd_unbind_process_from_device(dev, pasid);
	168	}
	169
4a488a7a OG	170	bool kgd2kfd_device_init(struct kfd_dev *kfd,
	171	const struct kgd2kfd_shared_resources *gpu_resources)
	172	{
19f6d2a6 OG	173	unsigned int size;
19f6d2a6 OG	174
4a488a7a OG	175	kfd->shared_resources = *gpu_resources;
4a488a7a OG	176
19f6d2a6 OG	177	/* calculate max size of mqds needed for queues */
	178	size = max_num_of_processes *
	179	max_num_of_queues_per_process *
	180	kfd->device_info->mqd_size_aligned;
	181
e18e794e OG	182	/*
	183	* calculate max size of runlist packet.
	184	* There can be only 2 packets at once
	185	*/
	186	size += (max_num_of_processes * sizeof(struct pm4_map_process) +
	187	max_num_of_processes * max_num_of_queues_per_process *
	188	sizeof(struct pm4_map_queues) + sizeof(struct pm4_runlist)) * 2;
	189
	190	/* Add size of HIQ & DIQ */
	191	size += KFD_KERNEL_QUEUE_SIZE * 2;
	192
	193	/* add another 512KB for all other allocations on gart (HPD, fences) */
19f6d2a6 OG	194	size += 512 * 1024;
	195
	196	if (kfd2kgd->init_sa_manager(kfd->kgd, size)) {
	197	dev_err(kfd_device,
e18e794e OG	198	"Could not allocate %d bytes for device (%x:%x)\n",
e18e794e OG	199	size, kfd->pdev->vendor, kfd->pdev->device);
19f6d2a6 OG	200	goto out;
	201	}
	202
e18e794e OG	203	dev_info(kfd_device,
	204	"Allocated %d bytes on gart for device(%x:%x)\n",
	205	size, kfd->pdev->vendor, kfd->pdev->device);
	206
19f6d2a6 OG	207	kfd_doorbell_init(kfd);
	208
	209	if (kfd_topology_add_device(kfd) != 0) {
	210	dev_err(kfd_device,
	211	"Error adding device (%x:%x) to topology\n",
	212	kfd->pdev->vendor, kfd->pdev->device);
	213	goto kfd_topology_add_device_error;
	214	}
	215
b3f5e6b4 AL	216	if (kfd_interrupt_init(kfd)) {
	217	dev_err(kfd_device,
	218	"Error initializing interrupts for device (%x:%x)\n",
	219	kfd->pdev->vendor, kfd->pdev->device);
	220	goto kfd_interrupt_error;
	221	}
	222
b17f068a OG	223	if (!device_iommu_pasid_init(kfd)) {
	224	dev_err(kfd_device,
	225	"Error initializing iommuv2 for device (%x:%x)\n",
	226	kfd->pdev->vendor, kfd->pdev->device);
	227	goto device_iommu_pasid_error;
	228	}
	229	amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
	230	iommu_pasid_shutdown_callback);
5b5c4e40	231
64c7f8cf BG	232	kfd->dqm = device_queue_manager_init(kfd);
	233	if (!kfd->dqm) {
	234	dev_err(kfd_device,
	235	"Error initializing queue manager for device (%x:%x)\n",
	236	kfd->pdev->vendor, kfd->pdev->device);
	237	goto device_queue_manager_error;
	238	}
	239
	240	if (kfd->dqm->start(kfd->dqm) != 0) {
	241	dev_err(kfd_device,
	242	"Error starting queuen manager for device (%x:%x)\n",
	243	kfd->pdev->vendor, kfd->pdev->device);
	244	goto dqm_start_error;
	245	}
	246
4a488a7a OG	247	kfd->init_complete = true;
	248	dev_info(kfd_device, "added device (%x:%x)\n", kfd->pdev->vendor,
	249	kfd->pdev->device);
	250
64c7f8cf BG	251	pr_debug("kfd: Starting kfd with the following scheduling policy %d\n",
	252	sched_policy);
	253
19f6d2a6 OG	254	goto out;
19f6d2a6 OG	255
64c7f8cf BG	256	dqm_start_error:
	257	device_queue_manager_uninit(kfd->dqm);
	258	device_queue_manager_error:
	259	amd_iommu_free_device(kfd->pdev);
b17f068a	260	device_iommu_pasid_error:
b3f5e6b4 AL	261	kfd_interrupt_exit(kfd);
b3f5e6b4 AL	262	kfd_interrupt_error:
b17f068a	263	kfd_topology_remove_device(kfd);
19f6d2a6 OG	264	kfd_topology_add_device_error:
	265	kfd2kgd->fini_sa_manager(kfd->kgd);
	266	dev_err(kfd_device,
	267	"device (%x:%x) NOT added due to errors\n",
	268	kfd->pdev->vendor, kfd->pdev->device);
	269	out:
	270	return kfd->init_complete;
4a488a7a OG	271	}
	272
	273	void kgd2kfd_device_exit(struct kfd_dev *kfd)
	274	{
b17f068a	275	if (kfd->init_complete) {
64c7f8cf	276	device_queue_manager_uninit(kfd->dqm);
b17f068a	277	amd_iommu_free_device(kfd->pdev);
b3f5e6b4	278	kfd_interrupt_exit(kfd);
b17f068a OG	279	kfd_topology_remove_device(kfd);
b17f068a OG	280	}
5b5c4e40	281
4a488a7a OG	282	kfree(kfd);
	283	}
	284
	285	void kgd2kfd_suspend(struct kfd_dev *kfd)
	286	{
	287	BUG_ON(kfd == NULL);
b17f068a	288
64c7f8cf BG	289	if (kfd->init_complete) {
64c7f8cf BG	290	kfd->dqm->stop(kfd->dqm);
abc9d3e3	291	amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
b17f068a	292	amd_iommu_free_device(kfd->pdev);
64c7f8cf	293	}
4a488a7a OG	294	}
	295
	296	int kgd2kfd_resume(struct kfd_dev *kfd)
	297	{
b17f068a OG	298	unsigned int pasid_limit;
	299	int err;
	300
4a488a7a OG	301	BUG_ON(kfd == NULL);
4a488a7a OG	302
b17f068a OG	303	pasid_limit = kfd_get_pasid_limit();
	304
	305	if (kfd->init_complete) {
	306	err = amd_iommu_init_device(kfd->pdev, pasid_limit);
	307	if (err < 0)
	308	return -ENXIO;
	309	amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
	310	iommu_pasid_shutdown_callback);
64c7f8cf	311	kfd->dqm->start(kfd->dqm);
b17f068a OG	312	}
b17f068a OG	313
4a488a7a OG	314	return 0;
	315	}
	316
b3f5e6b4 AL	317	/* This is called directly from KGD at ISR. */
b3f5e6b4 AL	318	void kgd2kfd_interrupt(struct kfd_dev kfd, const void ih_ring_entry)
4a488a7a	319	{
b3f5e6b4 AL	320	if (kfd->init_complete) {
	321	spin_lock(&kfd->interrupt_lock);
	322
	323	if (kfd->interrupts_active
	324	&& enqueue_ih_ring_entry(kfd, ih_ring_entry))
	325	schedule_work(&kfd->interrupt_work);
	326
	327	spin_unlock(&kfd->interrupt_lock);
	328	}
4a488a7a	329	}
6e81090b OG	330
	331	static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
	332	unsigned int chunk_size)
	333	{
	334	unsigned int num_of_bits;
	335
	336	BUG_ON(!kfd);
	337	BUG_ON(!kfd->gtt_mem);
	338	BUG_ON(buf_size < chunk_size);
	339	BUG_ON(buf_size == 0);
	340	BUG_ON(chunk_size == 0);
	341
	342	kfd->gtt_sa_chunk_size = chunk_size;
	343	kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;
	344
	345	num_of_bits = kfd->gtt_sa_num_of_chunks / BITS_PER_BYTE;
	346	BUG_ON(num_of_bits == 0);
	347
	348	kfd->gtt_sa_bitmap = kzalloc(num_of_bits, GFP_KERNEL);
	349
	350	if (!kfd->gtt_sa_bitmap)
	351	return -ENOMEM;
	352
	353	pr_debug("kfd: gtt_sa_num_of_chunks = %d, gtt_sa_bitmap = %p\n",
	354	kfd->gtt_sa_num_of_chunks, kfd->gtt_sa_bitmap);
	355
	356	mutex_init(&kfd->gtt_sa_lock);
	357
	358	return 0;
	359
	360	}
	361
	362	static void kfd_gtt_sa_fini(struct kfd_dev *kfd)
	363	{
	364	mutex_destroy(&kfd->gtt_sa_lock);
	365	kfree(kfd->gtt_sa_bitmap);
	366	}
	367
	368	static inline uint64_t kfd_gtt_sa_calc_gpu_addr(uint64_t start_addr,
	369	unsigned int bit_num,
	370	unsigned int chunk_size)
	371	{
	372	return start_addr + bit_num * chunk_size;
	373	}
	374
	375	static inline uint32_t kfd_gtt_sa_calc_cpu_addr(void start_addr,
	376	unsigned int bit_num,
	377	unsigned int chunk_size)
	378	{
	379	return (uint32_t ) ((uint64_t) start_addr + bit_num chunk_size);
	380	}
	381
	382	int kfd_gtt_sa_allocate(struct kfd_dev *kfd, unsigned int size,
	383	struct kfd_mem_obj **mem_obj)
	384	{
	385	unsigned int found, start_search, cur_size;
	386
	387	BUG_ON(!kfd);
	388
	389	if (size == 0)
	390	return -EINVAL;
	391
	392	if (size > kfd->gtt_sa_num_of_chunks * kfd->gtt_sa_chunk_size)
	393	return -ENOMEM;
394
395	*mem_obj = kmalloc(sizeof(struct kfd_mem_obj), GFP_KERNEL);
396	if ((*mem_obj) == NULL)
397	return -ENOMEM;
398
399	pr_debug("kfd: allocated mem_obj = %p for size = %d\n", *mem_obj, size);
400
401	start_search = 0;
402
403	mutex_lock(&kfd->gtt_sa_lock);
404
405	kfd_gtt_restart_search:
406	/* Find the first chunk that is free */
407	found = find_next_zero_bit(kfd->gtt_sa_bitmap,
408	kfd->gtt_sa_num_of_chunks,
409	start_search);
410
411	pr_debug("kfd: found = %d\n", found);
412
413	/* If there wasn't any free chunk, bail out */
414	if (found == kfd->gtt_sa_num_of_chunks)
415	goto kfd_gtt_no_free_chunk;
416
417	/* Update fields of mem_obj */
418	(*mem_obj)->range_start = found;
419	(*mem_obj)->range_end = found;
420	(*mem_obj)->gpu_addr = kfd_gtt_sa_calc_gpu_addr(
421	kfd->gtt_start_gpu_addr,
422	found,
423	kfd->gtt_sa_chunk_size);
424	(*mem_obj)->cpu_ptr = kfd_gtt_sa_calc_cpu_addr(
425	kfd->gtt_start_cpu_ptr,
426	found,
427	kfd->gtt_sa_chunk_size);
428
429	pr_debug("kfd: gpu_addr = %p, cpu_addr = %p\n",
430	(uint64_t ) (mem_obj)->gpu_addr, (*mem_obj)->cpu_ptr);
431
432	/* If we need only one chunk, mark it as allocated and get out */
433	if (size <= kfd->gtt_sa_chunk_size) {
434	pr_debug("kfd: single bit\n");
435	set_bit(found, kfd->gtt_sa_bitmap);
436	goto kfd_gtt_out;
437	}
438
439	/* Otherwise, try to see if we have enough contiguous chunks */
440	cur_size = size - kfd->gtt_sa_chunk_size;
441	do {
442	(*mem_obj)->range_end =
443	find_next_zero_bit(kfd->gtt_sa_bitmap,
444	kfd->gtt_sa_num_of_chunks, ++found);
445	/*
446	* If next free chunk is not contiguous than we need to
447	* restart our search from the last free chunk we found (which
448	* wasn't contiguous to the previous ones
449	*/
450	if ((*mem_obj)->range_end != found) {
451	start_search = found;
452	goto kfd_gtt_restart_search;
453	}
454
455	/*
456	* If we reached end of buffer, bail out with error
457	*/
458	if (found == kfd->gtt_sa_num_of_chunks)
459	goto kfd_gtt_no_free_chunk;
460
461	/* Check if we don't need another chunk */
462	if (cur_size <= kfd->gtt_sa_chunk_size)
463	cur_size = 0;
464	else
465	cur_size -= kfd->gtt_sa_chunk_size;
466
467	} while (cur_size > 0);
468
469	pr_debug("kfd: range_start = %d, range_end = %d\n",
470	(mem_obj)->range_start, (mem_obj)->range_end);
471
472	/* Mark the chunks as allocated */
473	for (found = (*mem_obj)->range_start;
474	found <= (*mem_obj)->range_end;
475	found++)
476	set_bit(found, kfd->gtt_sa_bitmap);
477
478	kfd_gtt_out:
479	mutex_unlock(&kfd->gtt_sa_lock);
480	return 0;
481
482	kfd_gtt_no_free_chunk:
483	pr_debug("kfd: allocation failed with mem_obj = %p\n", mem_obj);
484	mutex_unlock(&kfd->gtt_sa_lock);
485	kfree(mem_obj);
486	return -ENOMEM;
487	}
488
489	int kfd_gtt_sa_free(struct kfd_dev kfd, struct kfd_mem_obj mem_obj)
490	{
491	unsigned int bit;
492
493	BUG_ON(!kfd);
494	BUG_ON(!mem_obj);
495
496	pr_debug("kfd: free mem_obj = %p, range_start = %d, range_end = %d\n",
497	mem_obj, mem_obj->range_start, mem_obj->range_end);
498
499	mutex_lock(&kfd->gtt_sa_lock);
500
501	/* Mark the chunks as free */
502	for (bit = mem_obj->range_start;
503	bit <= mem_obj->range_end;
504	bit++)
505	clear_bit(bit, kfd->gtt_sa_bitmap);
506
507	mutex_unlock(&kfd->gtt_sa_lock);
508
509	kfree(mem_obj);
510	return 0;
511	}