[linux-2.6-block.git] / drivers / base / platform-msi.c

/*
 * MSI framework for platform devices
 *
 * Copyright (C) 2015 ARM Limited, All Rights Reserved.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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 <linux/device.h>
#include <linux/idr.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/slab.h>

#define DEV_ID_SHIFT	21
#define MAX_DEV_MSIS	(1 << (32 - DEV_ID_SHIFT))

/*
 * Internal data structure containing a (made up, but unique) devid
 * and the callback to write the MSI message.
 */
struct platform_msi_priv_data {
	struct device		*dev;
	void 			*host_data;
	msi_alloc_info_t	arg;
	irq_write_msi_msg_t	write_msg;
	int			devid;
};

/* The devid allocator */
static DEFINE_IDA(platform_msi_devid_ida);

#ifdef GENERIC_MSI_DOMAIN_OPS
/*
 * Convert an msi_desc to a globaly unique identifier (per-device
 * devid + msi_desc position in the msi_list).
 */
static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
{
	u32 devid;

	devid = desc->platform.msi_priv_data->devid;

	return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
}

static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
	arg->desc = desc;
	arg->hwirq = platform_msi_calc_hwirq(desc);
}

static int platform_msi_init(struct irq_domain *domain,
			     struct msi_domain_info *info,
			     unsigned int virq, irq_hw_number_t hwirq,
			     msi_alloc_info_t *arg)
{
	return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
					     info->chip, info->chip_data);
}
#else
#define platform_msi_set_desc		NULL
#define platform_msi_init		NULL
#endif

static void platform_msi_update_dom_ops(struct msi_domain_info *info)
{
	struct msi_domain_ops *ops = info->ops;

	BUG_ON(!ops);

	if (ops->msi_init == NULL)
		ops->msi_init = platform_msi_init;
	if (ops->set_desc == NULL)
		ops->set_desc = platform_msi_set_desc;
}

static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
	struct msi_desc *desc = irq_data_get_msi_desc(data);
	struct platform_msi_priv_data *priv_data;

	priv_data = desc->platform.msi_priv_data;

	priv_data->write_msg(desc, msg);
}

static void platform_msi_update_chip_ops(struct msi_domain_info *info)
{
	struct irq_chip *chip = info->chip;

	BUG_ON(!chip);
	if (!chip->irq_mask)
		chip->irq_mask = irq_chip_mask_parent;
	if (!chip->irq_unmask)
		chip->irq_unmask = irq_chip_unmask_parent;
	if (!chip->irq_eoi)
		chip->irq_eoi = irq_chip_eoi_parent;
	if (!chip->irq_set_affinity)
		chip->irq_set_affinity = msi_domain_set_affinity;
	if (!chip->irq_write_msi_msg)
		chip->irq_write_msi_msg = platform_msi_write_msg;
}

static void platform_msi_free_descs(struct device *dev, int base, int nvec)
{
	struct msi_desc *desc, *tmp;

	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
		if (desc->platform.msi_index >= base &&
		    desc->platform.msi_index < (base + nvec)) {
			list_del(&desc->list);
			free_msi_entry(desc);
		}
	}
}

static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
					     int nvec,
					     struct platform_msi_priv_data *data)

{
	struct msi_desc *desc;
	int i, base = 0;

	if (!list_empty(dev_to_msi_list(dev))) {
		desc = list_last_entry(dev_to_msi_list(dev),
				       struct msi_desc, list);
		base = desc->platform.msi_index + 1;
	}

	for (i = 0; i < nvec; i++) {
		desc = alloc_msi_entry(dev);
		if (!desc)
			break;

		desc->platform.msi_priv_data = data;
		desc->platform.msi_index = base + i;
		desc->nvec_used = 1;
		desc->irq = virq ? virq + i : 0;

		list_add_tail(&desc->list, dev_to_msi_list(dev));
	}

	if (i != nvec) {
		/* Clean up the mess */
		platform_msi_free_descs(dev, base, nvec);

		return -ENOMEM;
	}

	return 0;
}

static int platform_msi_alloc_descs(struct device *dev, int nvec,
				    struct platform_msi_priv_data *data)

{
	return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data);
}

/**
 * platform_msi_create_irq_domain - Create a platform MSI interrupt domain
 * @fwnode:		Optional fwnode of the interrupt controller
 * @info:	MSI domain info
 * @parent:	Parent irq domain
 *
 * Updates the domain and chip ops and creates a platform MSI
 * interrupt domain.
 *
 * Returns:
 * A domain pointer or NULL in case of failure.
 */
struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
						  struct msi_domain_info *info,
						  struct irq_domain *parent)
{
	struct irq_domain *domain;

	if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
		platform_msi_update_dom_ops(info);
	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
		platform_msi_update_chip_ops(info);

	domain = msi_create_irq_domain(fwnode, info, parent);
	if (domain)
		domain->bus_token = DOMAIN_BUS_PLATFORM_MSI;

	return domain;
}

static struct platform_msi_priv_data *
platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
			     irq_write_msi_msg_t write_msi_msg)
{
	struct platform_msi_priv_data *datap;
	/*
	 * Limit the number of interrupts to 256 per device. Should we
	 * need to bump this up, DEV_ID_SHIFT should be adjusted
	 * accordingly (which would impact the max number of MSI
	 * capable devices).
	 */
	if (!dev->msi_domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS)
		return ERR_PTR(-EINVAL);

	if (dev->msi_domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) {
		dev_err(dev, "Incompatible msi_domain, giving up\n");
		return ERR_PTR(-EINVAL);
	}

	/* Already had a helping of MSI? Greed... */
	if (!list_empty(dev_to_msi_list(dev)))
		return ERR_PTR(-EBUSY);

	datap = kzalloc(sizeof(*datap), GFP_KERNEL);
	if (!datap)
		return ERR_PTR(-ENOMEM);

	datap->devid = ida_simple_get(&platform_msi_devid_ida,
				      0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
	if (datap->devid < 0) {
		int err = datap->devid;
		kfree(datap);
		return ERR_PTR(err);
	}

	datap->write_msg = write_msi_msg;
	datap->dev = dev;

	return datap;
}

static void platform_msi_free_priv_data(struct platform_msi_priv_data *data)
{
	ida_simple_remove(&platform_msi_devid_ida, data->devid);
	kfree(data);
}

/**
 * platform_msi_domain_alloc_irqs - Allocate MSI interrupts for @dev
 * @dev:		The device for which to allocate interrupts
 * @nvec:		The number of interrupts to allocate
 * @write_msi_msg:	Callback to write an interrupt message for @dev
 *
 * Returns:
 * Zero for success, or an error code in case of failure
 */
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
				   irq_write_msi_msg_t write_msi_msg)
{
	struct platform_msi_priv_data *priv_data;
	int err;

	priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
	if (IS_ERR(priv_data))
		return PTR_ERR(priv_data);

	err = platform_msi_alloc_descs(dev, nvec, priv_data);
	if (err)
		goto out_free_priv_data;

	err = msi_domain_alloc_irqs(dev->msi_domain, dev, nvec);
	if (err)
		goto out_free_desc;

	return 0;

out_free_desc:
	platform_msi_free_descs(dev, 0, nvec);
out_free_priv_data:
	platform_msi_free_priv_data(priv_data);

	return err;
}

/**
 * platform_msi_domain_free_irqs - Free MSI interrupts for @dev
 * @dev:	The device for which to free interrupts
 */
void platform_msi_domain_free_irqs(struct device *dev)
{
	if (!list_empty(dev_to_msi_list(dev))) {
		struct msi_desc *desc;

		desc = first_msi_entry(dev);
		platform_msi_free_priv_data(desc->platform.msi_priv_data);
	}

	msi_domain_free_irqs(dev->msi_domain, dev);
	platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
}

/**
 * platform_msi_get_host_data - Query the private data associated with
 *                              a platform-msi domain
 * @domain:	The platform-msi domain
 *
 * Returns the private data provided when calling
 * platform_msi_create_device_domain.
 */
void *platform_msi_get_host_data(struct irq_domain *domain)
{
	struct platform_msi_priv_data *data = domain->host_data;
	return data->host_data;
}

/**
 * platform_msi_create_device_domain - Create a platform-msi domain
 *
 * @dev:		The device generating the MSIs
 * @nvec:		The number of MSIs that need to be allocated
 * @write_msi_msg:	Callback to write an interrupt message for @dev
 * @ops:		The hierarchy domain operations to use
 * @host_data:		Private data associated to this domain
 *
 * Returns an irqdomain for @nvec interrupts
 */
struct irq_domain *
platform_msi_create_device_domain(struct device *dev,
				  unsigned int nvec,
				  irq_write_msi_msg_t write_msi_msg,
				  const struct irq_domain_ops *ops,
				  void *host_data)
{
	struct platform_msi_priv_data *data;
	struct irq_domain *domain;
	int err;

	data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
	if (IS_ERR(data))
		return NULL;

	data->host_data = host_data;
	domain = irq_domain_create_hierarchy(dev->msi_domain, 0, nvec,
					     of_node_to_fwnode(dev->of_node),
					     ops, data);
	if (!domain)
		goto free_priv;

	err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg);
	if (err)
		goto free_domain;

	return domain;

free_domain:
	irq_domain_remove(domain);
free_priv:
	platform_msi_free_priv_data(data);
	return NULL;
}

/**
 * platform_msi_domain_free - Free interrupts associated with a platform-msi
 *                            domain
 *
 * @domain:	The platform-msi domain
 * @virq:	The base irq from which to perform the free operation
 * @nvec:	How many interrupts to free from @virq
 */
void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
			      unsigned int nvec)
{
	struct platform_msi_priv_data *data = domain->host_data;
	struct msi_desc *desc;
	for_each_msi_entry(desc, data->dev) {
		if (WARN_ON(!desc->irq || desc->nvec_used != 1))
			return;
		if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
			continue;

		irq_domain_free_irqs_common(domain, desc->irq, 1);
	}
}

/**
 * platform_msi_domain_alloc - Allocate interrupts associated with
 *			       a platform-msi domain
 *
 * @domain:	The platform-msi domain
 * @virq:	The base irq from which to perform the allocate operation
 * @nvec:	How many interrupts to free from @virq
 *
 * Return 0 on success, or an error code on failure. Must be called
 * with irq_domain_mutex held (which can only be done as part of a
 * top-level interrupt allocation).
 */
int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs)
{
	struct platform_msi_priv_data *data = domain->host_data;
	int err;

	err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data);
	if (err)
		return err;

	err = msi_domain_populate_irqs(domain->parent, data->dev,
				       virq, nr_irqs, &data->arg);
	if (err)
		platform_msi_domain_free(domain, virq, nr_irqs);

	return err;
}
Commit	Line	Data
c09fcc4b MZ	1	/*
	2	* MSI framework for platform devices
	3	*
	4	* Copyright (C) 2015 ARM Limited, All Rights Reserved.
	5	* Author: Marc Zyngier <marc.zyngier@arm.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/device.h>
	21	#include <linux/idr.h>
	22	#include <linux/irq.h>
	23	#include <linux/irqdomain.h>
	24	#include <linux/msi.h>
	25	#include <linux/slab.h>
	26
aff5e06b	27	#define DEV_ID_SHIFT 21
ab6484ee	28	#define MAX_DEV_MSIS (1 << (32 - DEV_ID_SHIFT))
c09fcc4b MZ	29
	30	/*
	31	* Internal data structure containing a (made up, but unique) devid
	32	* and the callback to write the MSI message.
	33	*/
	34	struct platform_msi_priv_data {
552c494a MZ	35	struct device *dev;
	36	void *host_data;
	37	msi_alloc_info_t arg;
c09fcc4b MZ	38	irq_write_msi_msg_t write_msg;
	39	int devid;
	40	};
	41
	42	/* The devid allocator */
	43	static DEFINE_IDA(platform_msi_devid_ida);
	44
	45	#ifdef GENERIC_MSI_DOMAIN_OPS
	46	/*
	47	* Convert an msi_desc to a globaly unique identifier (per-device
	48	* devid + msi_desc position in the msi_list).
	49	*/
	50	static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
	51	{
	52	u32 devid;
	53
	54	devid = desc->platform.msi_priv_data->devid;
	55
	56	return (devid << (32 - DEV_ID_SHIFT)) \| desc->platform.msi_index;
	57	}
	58
	59	static void platform_msi_set_desc(msi_alloc_info_t arg, struct msi_desc desc)
	60	{
	61	arg->desc = desc;
	62	arg->hwirq = platform_msi_calc_hwirq(desc);
	63	}
	64
	65	static int platform_msi_init(struct irq_domain *domain,
	66	struct msi_domain_info *info,
	67	unsigned int virq, irq_hw_number_t hwirq,
	68	msi_alloc_info_t *arg)
	69	{
e4084a16 MZ	70	return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
e4084a16 MZ	71	info->chip, info->chip_data);
c09fcc4b MZ	72	}
	73	#else
	74	#define platform_msi_set_desc NULL
	75	#define platform_msi_init NULL
	76	#endif
	77
	78	static void platform_msi_update_dom_ops(struct msi_domain_info *info)
	79	{
	80	struct msi_domain_ops *ops = info->ops;
	81
	82	BUG_ON(!ops);
	83
	84	if (ops->msi_init == NULL)
	85	ops->msi_init = platform_msi_init;
	86	if (ops->set_desc == NULL)
	87	ops->set_desc = platform_msi_set_desc;
	88	}
	89
	90	static void platform_msi_write_msg(struct irq_data data, struct msi_msg msg)
	91	{
e4084a16	92	struct msi_desc *desc = irq_data_get_msi_desc(data);
c09fcc4b MZ	93	struct platform_msi_priv_data *priv_data;
	94
	95	priv_data = desc->platform.msi_priv_data;
	96
	97	priv_data->write_msg(desc, msg);
	98	}
	99
	100	static void platform_msi_update_chip_ops(struct msi_domain_info *info)
	101	{
	102	struct irq_chip *chip = info->chip;
	103
	104	BUG_ON(!chip);
	105	if (!chip->irq_mask)
	106	chip->irq_mask = irq_chip_mask_parent;
	107	if (!chip->irq_unmask)
	108	chip->irq_unmask = irq_chip_unmask_parent;
	109	if (!chip->irq_eoi)
	110	chip->irq_eoi = irq_chip_eoi_parent;
	111	if (!chip->irq_set_affinity)
	112	chip->irq_set_affinity = msi_domain_set_affinity;
	113	if (!chip->irq_write_msi_msg)
	114	chip->irq_write_msi_msg = platform_msi_write_msg;
	115	}
	116
ab6484ee	117	static void platform_msi_free_descs(struct device *dev, int base, int nvec)
c09fcc4b MZ	118	{
	119	struct msi_desc desc, tmp;
	120
	121	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
ab6484ee MZ	122	if (desc->platform.msi_index >= base &&
	123	desc->platform.msi_index < (base + nvec)) {
	124	list_del(&desc->list);
	125	free_msi_entry(desc);
	126	}
c09fcc4b MZ	127	}
	128	}
	129
552c494a MZ	130	static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
	131	int nvec,
	132	struct platform_msi_priv_data *data)
c09fcc4b MZ	133
c09fcc4b MZ	134	{
ab6484ee MZ	135	struct msi_desc *desc;
ab6484ee MZ	136	int i, base = 0;
c09fcc4b	137
ab6484ee MZ	138	if (!list_empty(dev_to_msi_list(dev))) {
	139	desc = list_last_entry(dev_to_msi_list(dev),
	140	struct msi_desc, list);
	141	base = desc->platform.msi_index + 1;
	142	}
c09fcc4b	143
ab6484ee	144	for (i = 0; i < nvec; i++) {
c09fcc4b MZ	145	desc = alloc_msi_entry(dev);
	146	if (!desc)
	147	break;
	148
	149	desc->platform.msi_priv_data = data;
ab6484ee	150	desc->platform.msi_index = base + i;
c09fcc4b	151	desc->nvec_used = 1;
552c494a	152	desc->irq = virq ? virq + i : 0;
c09fcc4b MZ	153
	154	list_add_tail(&desc->list, dev_to_msi_list(dev));
	155	}
	156
	157	if (i != nvec) {
	158	/* Clean up the mess */
ab6484ee	159	platform_msi_free_descs(dev, base, nvec);
c09fcc4b MZ	160
	161	return -ENOMEM;
	162	}
	163
	164	return 0;
	165	}
	166
552c494a MZ	167	static int platform_msi_alloc_descs(struct device *dev, int nvec,
	168	struct platform_msi_priv_data *data)
	169
	170	{
	171	return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data);
	172	}
	173
c09fcc4b MZ	174	/**
c09fcc4b MZ	175	* platform_msi_create_irq_domain - Create a platform MSI interrupt domain
be5436c8	176	* @fwnode: Optional fwnode of the interrupt controller
c09fcc4b MZ	177	* @info: MSI domain info
	178	* @parent: Parent irq domain
	179	*
	180	* Updates the domain and chip ops and creates a platform MSI
	181	* interrupt domain.
	182	*
	183	* Returns:
	184	* A domain pointer or NULL in case of failure.
	185	*/
be5436c8	186	struct irq_domain platform_msi_create_irq_domain(struct fwnode_handle fwnode,
c09fcc4b MZ	187	struct msi_domain_info *info,
	188	struct irq_domain *parent)
	189	{
	190	struct irq_domain *domain;
	191
	192	if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
	193	platform_msi_update_dom_ops(info);
	194	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
	195	platform_msi_update_chip_ops(info);
	196
be5436c8	197	domain = msi_create_irq_domain(fwnode, info, parent);
c09fcc4b MZ	198	if (domain)
	199	domain->bus_token = DOMAIN_BUS_PLATFORM_MSI;
	200
	201	return domain;
	202	}
	203
72f57f2f MZ	204	static struct platform_msi_priv_data *
	205	platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
	206	irq_write_msi_msg_t write_msi_msg)
c09fcc4b	207	{
72f57f2f	208	struct platform_msi_priv_data *datap;
c09fcc4b MZ	209	/*
	210	* Limit the number of interrupts to 256 per device. Should we
	211	* need to bump this up, DEV_ID_SHIFT should be adjusted
	212	* accordingly (which would impact the max number of MSI
	213	* capable devices).
	214	*/
ab6484ee	215	if (!dev->msi_domain \|\| !write_msi_msg \|\| !nvec \|\| nvec > MAX_DEV_MSIS)
72f57f2f	216	return ERR_PTR(-EINVAL);
c09fcc4b MZ	217
	218	if (dev->msi_domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) {
	219	dev_err(dev, "Incompatible msi_domain, giving up\n");
72f57f2f	220	return ERR_PTR(-EINVAL);
c09fcc4b MZ	221	}
	222
	223	/* Already had a helping of MSI? Greed... */
	224	if (!list_empty(dev_to_msi_list(dev)))
72f57f2f MZ	225	return ERR_PTR(-EBUSY);
	226
	227	datap = kzalloc(sizeof(*datap), GFP_KERNEL);
	228	if (!datap)
	229	return ERR_PTR(-ENOMEM);
	230
	231	datap->devid = ida_simple_get(&platform_msi_devid_ida,
	232	0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
	233	if (datap->devid < 0) {
	234	int err = datap->devid;
	235	kfree(datap);
	236	return ERR_PTR(err);
	237	}
c09fcc4b	238
72f57f2f	239	datap->write_msg = write_msi_msg;
552c494a	240	datap->dev = dev;
c09fcc4b	241
72f57f2f MZ	242	return datap;
	243	}
	244
	245	static void platform_msi_free_priv_data(struct platform_msi_priv_data *data)
	246	{
	247	ida_simple_remove(&platform_msi_devid_ida, data->devid);
	248	kfree(data);
	249	}
	250
	251	/**
	252	* platform_msi_domain_alloc_irqs - Allocate MSI interrupts for @dev
	253	* @dev: The device for which to allocate interrupts
	254	* @nvec: The number of interrupts to allocate
	255	* @write_msi_msg: Callback to write an interrupt message for @dev
	256	*
	257	* Returns:
	258	* Zero for success, or an error code in case of failure
	259	*/
	260	int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
	261	irq_write_msi_msg_t write_msi_msg)
	262	{
	263	struct platform_msi_priv_data *priv_data;
	264	int err;
c09fcc4b	265
72f57f2f MZ	266	priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
	267	if (IS_ERR(priv_data))
	268	return PTR_ERR(priv_data);
c09fcc4b MZ	269
	270	err = platform_msi_alloc_descs(dev, nvec, priv_data);
	271	if (err)
72f57f2f	272	goto out_free_priv_data;
c09fcc4b MZ	273
	274	err = msi_domain_alloc_irqs(dev->msi_domain, dev, nvec);
	275	if (err)
	276	goto out_free_desc;
	277
	278	return 0;
	279
	280	out_free_desc:
ab6484ee	281	platform_msi_free_descs(dev, 0, nvec);
72f57f2f MZ	282	out_free_priv_data:
72f57f2f MZ	283	platform_msi_free_priv_data(priv_data);
c09fcc4b MZ	284
	285	return err;
	286	}
	287
	288	/**
	289	* platform_msi_domain_free_irqs - Free MSI interrupts for @dev
	290	* @dev: The device for which to free interrupts
	291	*/
	292	void platform_msi_domain_free_irqs(struct device *dev)
	293	{
72f57f2f MZ	294	if (!list_empty(dev_to_msi_list(dev))) {
72f57f2f MZ	295	struct msi_desc *desc;
c09fcc4b	296
72f57f2f MZ	297	desc = first_msi_entry(dev);
72f57f2f MZ	298	platform_msi_free_priv_data(desc->platform.msi_priv_data);
c09fcc4b MZ	299	}
	300
	301	msi_domain_free_irqs(dev->msi_domain, dev);
ab6484ee	302	platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
c09fcc4b	303	}
552c494a MZ	304
	305	/**
	306	* platform_msi_get_host_data - Query the private data associated with
	307	* a platform-msi domain
	308	* @domain: The platform-msi domain
	309	*
	310	* Returns the private data provided when calling
	311	* platform_msi_create_device_domain.
	312	*/
	313	void platform_msi_get_host_data(struct irq_domain domain)
	314	{
	315	struct platform_msi_priv_data *data = domain->host_data;
	316	return data->host_data;
	317	}
	318
	319	/**
	320	* platform_msi_create_device_domain - Create a platform-msi domain
	321	*
	322	* @dev: The device generating the MSIs
	323	* @nvec: The number of MSIs that need to be allocated
	324	* @write_msi_msg: Callback to write an interrupt message for @dev
	325	* @ops: The hierarchy domain operations to use
	326	* @host_data: Private data associated to this domain
	327	*
	328	* Returns an irqdomain for @nvec interrupts
	329	*/
	330	struct irq_domain *
	331	platform_msi_create_device_domain(struct device *dev,
	332	unsigned int nvec,
	333	irq_write_msi_msg_t write_msi_msg,
	334	const struct irq_domain_ops *ops,
	335	void *host_data)
	336	{
	337	struct platform_msi_priv_data *data;
	338	struct irq_domain *domain;
	339	int err;
	340
	341	data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
	342	if (IS_ERR(data))
	343	return NULL;
	344
	345	data->host_data = host_data;
	346	domain = irq_domain_create_hierarchy(dev->msi_domain, 0, nvec,
	347	of_node_to_fwnode(dev->of_node),
	348	ops, data);
	349	if (!domain)
	350	goto free_priv;
	351
	352	err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg);
	353	if (err)
	354	goto free_domain;
	355
	356	return domain;
	357
	358	free_domain:
	359	irq_domain_remove(domain);
	360	free_priv:
	361	platform_msi_free_priv_data(data);
	362	return NULL;
	363	}
	364
	365	/**
	366	* platform_msi_domain_free - Free interrupts associated with a platform-msi
	367	* domain
368	*
369	* @domain: The platform-msi domain
370	* @virq: The base irq from which to perform the free operation
371	* @nvec: How many interrupts to free from @virq
372	*/
373	void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
374	unsigned int nvec)
375	{
376	struct platform_msi_priv_data *data = domain->host_data;
377	struct msi_desc *desc;
378	for_each_msi_entry(desc, data->dev) {
379	if (WARN_ON(!desc->irq \|\| desc->nvec_used != 1))
380	return;
381	if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
382	continue;
383
384	irq_domain_free_irqs_common(domain, desc->irq, 1);
385	}
386	}
387
388	/**
389	* platform_msi_domain_alloc - Allocate interrupts associated with
390	* a platform-msi domain
391	*
392	* @domain: The platform-msi domain
393	* @virq: The base irq from which to perform the allocate operation
394	* @nvec: How many interrupts to free from @virq
395	*
396	* Return 0 on success, or an error code on failure. Must be called
397	* with irq_domain_mutex held (which can only be done as part of a
398	* top-level interrupt allocation).
399	*/
400	int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
401	unsigned int nr_irqs)
402	{
403	struct platform_msi_priv_data *data = domain->host_data;
404	int err;
405
406	err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data);
407	if (err)
408	return err;
409
410	err = msi_domain_populate_irqs(domain->parent, data->dev,
411	virq, nr_irqs, &data->arg);
412	if (err)
413	platform_msi_domain_free(domain, virq, nr_irqs);
414
415	return err;
416	}