[mirror_ubuntu-disco-kernel.git] / drivers / xen / xen-pciback / conf_space.c

// SPDX-License-Identifier: GPL-2.0
/*
 * PCI Backend - Functions for creating a virtual configuration space for
 *               exported PCI Devices.
 *               It's dangerous to allow PCI Driver Domains to change their
 *               device's resources (memory, i/o ports, interrupts). We need to
 *               restrict changes to certain PCI Configuration registers:
 *               BARs, INTERRUPT_PIN, most registers in the header...
 *
 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
 */

#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include "pciback.h"
#include "conf_space.h"
#include "conf_space_quirks.h"

bool xen_pcibk_permissive;
module_param_named(permissive, xen_pcibk_permissive, bool, 0644);

/* This is where xen_pcibk_read_config_byte, xen_pcibk_read_config_word,
 * xen_pcibk_write_config_word, and xen_pcibk_write_config_byte are created. */
#define DEFINE_PCI_CONFIG(op, size, type)			\
int xen_pcibk_##op##_config_##size				\
(struct pci_dev *dev, int offset, type value, void *data)	\
{								\
	return pci_##op##_config_##size(dev, offset, value);	\
}

DEFINE_PCI_CONFIG(read, byte, u8 *)
DEFINE_PCI_CONFIG(read, word, u16 *)
DEFINE_PCI_CONFIG(read, dword, u32 *)

DEFINE_PCI_CONFIG(write, byte, u8)
DEFINE_PCI_CONFIG(write, word, u16)
DEFINE_PCI_CONFIG(write, dword, u32)

static int conf_space_read(struct pci_dev *dev,
			   const struct config_field_entry *entry,
			   int offset, u32 *value)
{
	int ret = 0;
	const struct config_field *field = entry->field;

	*value = 0;

	switch (field->size) {
	case 1:
		if (field->u.b.read)
			ret = field->u.b.read(dev, offset, (u8 *) value,
					      entry->data);
		break;
	case 2:
		if (field->u.w.read)
			ret = field->u.w.read(dev, offset, (u16 *) value,
					      entry->data);
		break;
	case 4:
		if (field->u.dw.read)
			ret = field->u.dw.read(dev, offset, value, entry->data);
		break;
	}
	return ret;
}

static int conf_space_write(struct pci_dev *dev,
			    const struct config_field_entry *entry,
			    int offset, u32 value)
{
	int ret = 0;
	const struct config_field *field = entry->field;

	switch (field->size) {
	case 1:
		if (field->u.b.write)
			ret = field->u.b.write(dev, offset, (u8) value,
					       entry->data);
		break;
	case 2:
		if (field->u.w.write)
			ret = field->u.w.write(dev, offset, (u16) value,
					       entry->data);
		break;
	case 4:
		if (field->u.dw.write)
			ret = field->u.dw.write(dev, offset, value,
						entry->data);
		break;
	}
	return ret;
}

static inline u32 get_mask(int size)
{
	if (size == 1)
		return 0xff;
	else if (size == 2)
		return 0xffff;
	else
		return 0xffffffff;
}

static inline int valid_request(int offset, int size)
{
	/* Validate request (no un-aligned requests) */
	if ((size == 1 || size == 2 || size == 4) && (offset % size) == 0)
		return 1;
	return 0;
}

static inline u32 merge_value(u32 val, u32 new_val, u32 new_val_mask,
			      int offset)
{
	if (offset >= 0) {
		new_val_mask <<= (offset * 8);
		new_val <<= (offset * 8);
	} else {
		new_val_mask >>= (offset * -8);
		new_val >>= (offset * -8);
	}
	val = (val & ~new_val_mask) | (new_val & new_val_mask);

	return val;
}

static int xen_pcibios_err_to_errno(int err)
{
	switch (err) {
	case PCIBIOS_SUCCESSFUL:
		return XEN_PCI_ERR_success;
	case PCIBIOS_DEVICE_NOT_FOUND:
		return XEN_PCI_ERR_dev_not_found;
	case PCIBIOS_BAD_REGISTER_NUMBER:
		return XEN_PCI_ERR_invalid_offset;
	case PCIBIOS_FUNC_NOT_SUPPORTED:
		return XEN_PCI_ERR_not_implemented;
	case PCIBIOS_SET_FAILED:
		return XEN_PCI_ERR_access_denied;
	}
	return err;
}

int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
			  u32 *ret_val)
{
	int err = 0;
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	const struct config_field_entry *cfg_entry;
	const struct config_field *field;
	int field_start, field_end;
	/* if read fails for any reason, return 0
	 * (as if device didn't respond) */
	u32 value = 0, tmp_val;

	if (unlikely(verbose_request))
		printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x\n",
		       pci_name(dev), size, offset);

	if (!valid_request(offset, size)) {
		err = XEN_PCI_ERR_invalid_offset;
		goto out;
	}

	/* Get the real value first, then modify as appropriate */
	switch (size) {
	case 1:
		err = pci_read_config_byte(dev, offset, (u8 *) &value);
		break;
	case 2:
		err = pci_read_config_word(dev, offset, (u16 *) &value);
		break;
	case 4:
		err = pci_read_config_dword(dev, offset, &value);
		break;
	}

	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
		field = cfg_entry->field;

		field_start = OFFSET(cfg_entry);
		field_end = OFFSET(cfg_entry) + field->size;

		if (offset + size > field_start && field_end > offset) {
			err = conf_space_read(dev, cfg_entry, field_start,
					      &tmp_val);
			if (err)
				goto out;

			value = merge_value(value, tmp_val,
					    get_mask(field->size),
					    field_start - offset);
		}
	}

out:
	if (unlikely(verbose_request))
		printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x = %x\n",
		       pci_name(dev), size, offset, value);

	*ret_val = value;
	return xen_pcibios_err_to_errno(err);
}

int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value)
{
	int err = 0, handled = 0;
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	const struct config_field_entry *cfg_entry;
	const struct config_field *field;
	u32 tmp_val;
	int field_start, field_end;

	if (unlikely(verbose_request))
		printk(KERN_DEBUG
		       DRV_NAME ": %s: write request %d bytes at 0x%x = %x\n",
		       pci_name(dev), size, offset, value);

	if (!valid_request(offset, size))
		return XEN_PCI_ERR_invalid_offset;

	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
		field = cfg_entry->field;

		field_start = OFFSET(cfg_entry);
		field_end = OFFSET(cfg_entry) + field->size;

		if (offset + size > field_start && field_end > offset) {
			err = conf_space_read(dev, cfg_entry, field_start,
					      &tmp_val);
			if (err)
				break;

			tmp_val = merge_value(tmp_val, value, get_mask(size),
					      offset - field_start);

			err = conf_space_write(dev, cfg_entry, field_start,
					       tmp_val);

			/* handled is set true here, but not every byte
			 * may have been written! Properly detecting if
			 * every byte is handled is unnecessary as the
			 * flag is used to detect devices that need
			 * special helpers to work correctly.
			 */
			handled = 1;
		}
	}

	if (!handled && !err) {
		/* By default, anything not specificially handled above is
		 * read-only. The permissive flag changes this behavior so
		 * that anything not specifically handled above is writable.
		 * This means that some fields may still be read-only because
		 * they have entries in the config_field list that intercept
		 * the write and do nothing. */
		if (dev_data->permissive || xen_pcibk_permissive) {
			switch (size) {
			case 1:
				err = pci_write_config_byte(dev, offset,
							    (u8) value);
				break;
			case 2:
				err = pci_write_config_word(dev, offset,
							    (u16) value);
				break;
			case 4:
				err = pci_write_config_dword(dev, offset,
							     (u32) value);
				break;
			}
		} else if (!dev_data->warned_on_write) {
			dev_data->warned_on_write = 1;
			dev_warn(&dev->dev, "Driver tried to write to a "
				 "read-only configuration space field at offset"
				 " 0x%x, size %d. This may be harmless, but if "
				 "you have problems with your device:\n"
				 "1) see permissive attribute in sysfs\n"
				 "2) report problems to the xen-devel "
				 "mailing list along with details of your "
				 "device obtained from lspci.\n", offset, size);
		}
	}

	return xen_pcibios_err_to_errno(err);
}

void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev)
{
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	struct config_field_entry *cfg_entry, *t;
	const struct config_field *field;

	dev_dbg(&dev->dev, "free-ing dynamically allocated virtual "
			   "configuration space fields\n");
	if (!dev_data)
		return;

	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {
		field = cfg_entry->field;

		if (field->clean) {
			field->clean((struct config_field *)field);

			kfree(cfg_entry->data);

			list_del(&cfg_entry->list);
			kfree(cfg_entry);
		}

	}
}

void xen_pcibk_config_reset_dev(struct pci_dev *dev)
{
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	const struct config_field_entry *cfg_entry;
	const struct config_field *field;

	dev_dbg(&dev->dev, "resetting virtual configuration space\n");
	if (!dev_data)
		return;

	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
		field = cfg_entry->field;

		if (field->reset)
			field->reset(dev, OFFSET(cfg_entry), cfg_entry->data);
	}
}

void xen_pcibk_config_free_dev(struct pci_dev *dev)
{
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	struct config_field_entry *cfg_entry, *t;
	const struct config_field *field;

	dev_dbg(&dev->dev, "free-ing virtual configuration space fields\n");
	if (!dev_data)
		return;

	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {
		list_del(&cfg_entry->list);

		field = cfg_entry->field;

		if (field->release)
			field->release(dev, OFFSET(cfg_entry), cfg_entry->data);

		kfree(cfg_entry);
	}
}

int xen_pcibk_config_add_field_offset(struct pci_dev *dev,
				    const struct config_field *field,
				    unsigned int base_offset)
{
	int err = 0;
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
	struct config_field_entry *cfg_entry;
	void *tmp;

	cfg_entry = kmalloc(sizeof(*cfg_entry), GFP_KERNEL);
	if (!cfg_entry) {
		err = -ENOMEM;
		goto out;
	}

	cfg_entry->data = NULL;
	cfg_entry->field = field;
	cfg_entry->base_offset = base_offset;

	/* silently ignore duplicate fields */
	err = xen_pcibk_field_is_dup(dev, OFFSET(cfg_entry));
	if (err)
		goto out;

	if (field->init) {
		tmp = field->init(dev, OFFSET(cfg_entry));

		if (IS_ERR(tmp)) {
			err = PTR_ERR(tmp);
			goto out;
		}

		cfg_entry->data = tmp;
	}

	dev_dbg(&dev->dev, "added config field at offset 0x%02x\n",
		OFFSET(cfg_entry));
	list_add_tail(&cfg_entry->list, &dev_data->config_fields);

out:
	if (err)
		kfree(cfg_entry);

	return err;
}

/* This sets up the device's virtual configuration space to keep track of
 * certain registers (like the base address registers (BARs) so that we can
 * keep the client from manipulating them directly.
 */
int xen_pcibk_config_init_dev(struct pci_dev *dev)
{
	int err = 0;
	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);

	dev_dbg(&dev->dev, "initializing virtual configuration space\n");

	INIT_LIST_HEAD(&dev_data->config_fields);

	err = xen_pcibk_config_header_add_fields(dev);
	if (err)
		goto out;

	err = xen_pcibk_config_capability_add_fields(dev);
	if (err)
		goto out;

	err = xen_pcibk_config_quirks_init(dev);

out:
	return err;
}

int xen_pcibk_config_init(void)
{
	return xen_pcibk_config_capability_init();
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
30edc14b KRW	2	/*
	3	* PCI Backend - Functions for creating a virtual configuration space for
	4	* exported PCI Devices.
	5	* It's dangerous to allow PCI Driver Domains to change their
	6	* device's resources (memory, i/o ports, interrupts). We need to
	7	* restrict changes to certain PCI Configuration registers:
	8	* BARs, INTERRUPT_PIN, most registers in the header...
	9	*
	10	* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
	11	*/
	12
	13	#include <linux/kernel.h>
59aa56bf	14	#include <linux/moduleparam.h>
30edc14b KRW	15	#include <linux/pci.h>
	16	#include "pciback.h"
	17	#include "conf_space.h"
	18	#include "conf_space_quirks.h"
	19
8014bcc8 BH	20	bool xen_pcibk_permissive;
8014bcc8 BH	21	module_param_named(permissive, xen_pcibk_permissive, bool, 0644);
30edc14b	22
a92336a1 KRW	23	/* This is where xen_pcibk_read_config_byte, xen_pcibk_read_config_word,
a92336a1 KRW	24	* xen_pcibk_write_config_word, and xen_pcibk_write_config_byte are created. */
8bfd4e02	25	#define DEFINE_PCI_CONFIG(op, size, type) \
a92336a1	26	int xen_pcibk_##op##_config_##size \
30edc14b KRW	27	(struct pci_dev dev, int offset, type value, void data) \
	28	{ \
	29	return pci_##op##_config_##size(dev, offset, value); \
	30	}
	31
	32	DEFINE_PCI_CONFIG(read, byte, u8 *)
	33	DEFINE_PCI_CONFIG(read, word, u16 *)
	34	DEFINE_PCI_CONFIG(read, dword, u32 *)
	35
	36	DEFINE_PCI_CONFIG(write, byte, u8)
	37	DEFINE_PCI_CONFIG(write, word, u16)
	38	DEFINE_PCI_CONFIG(write, dword, u32)
	39
	40	static int conf_space_read(struct pci_dev *dev,
	41	const struct config_field_entry *entry,
	42	int offset, u32 *value)
	43	{
	44	int ret = 0;
	45	const struct config_field *field = entry->field;
	46
	47	*value = 0;
	48
	49	switch (field->size) {
	50	case 1:
	51	if (field->u.b.read)
	52	ret = field->u.b.read(dev, offset, (u8 *) value,
	53	entry->data);
	54	break;
	55	case 2:
	56	if (field->u.w.read)
	57	ret = field->u.w.read(dev, offset, (u16 *) value,
	58	entry->data);
	59	break;
	60	case 4:
	61	if (field->u.dw.read)
	62	ret = field->u.dw.read(dev, offset, value, entry->data);
	63	break;
	64	}
	65	return ret;
	66	}
	67
	68	static int conf_space_write(struct pci_dev *dev,
	69	const struct config_field_entry *entry,
	70	int offset, u32 value)
	71	{
	72	int ret = 0;
	73	const struct config_field *field = entry->field;
	74
	75	switch (field->size) {
	76	case 1:
	77	if (field->u.b.write)
	78	ret = field->u.b.write(dev, offset, (u8) value,
	79	entry->data);
	80	break;
	81	case 2:
	82	if (field->u.w.write)
	83	ret = field->u.w.write(dev, offset, (u16) value,
	84	entry->data);
	85	break;
	86	case 4:
	87	if (field->u.dw.write)
	88	ret = field->u.dw.write(dev, offset, value,
	89	entry->data);
	90	break;
91	}
92	return ret;
93	}
94
95	static inline u32 get_mask(int size)
96	{
97	if (size == 1)
98	return 0xff;
99	else if (size == 2)
100	return 0xffff;
101	else
102	return 0xffffffff;
103	}
104
105	static inline int valid_request(int offset, int size)
106	{
107	/* Validate request (no un-aligned requests) */
108	if ((size == 1 \|\| size == 2 \|\| size == 4) && (offset % size) == 0)
109	return 1;
110	return 0;
111	}
112
113	static inline u32 merge_value(u32 val, u32 new_val, u32 new_val_mask,
114	int offset)
115	{
116	if (offset >= 0) {
117	new_val_mask <<= (offset * 8);
118	new_val <<= (offset * 8);
119	} else {
120	new_val_mask >>= (offset * -8);
121	new_val >>= (offset * -8);
122	}
123	val = (val & ~new_val_mask) \| (new_val & new_val_mask);
124
125	return val;
126	}
127
a6961651	128	static int xen_pcibios_err_to_errno(int err)
30edc14b KRW	129	{
	130	switch (err) {
	131	case PCIBIOS_SUCCESSFUL:
	132	return XEN_PCI_ERR_success;
	133	case PCIBIOS_DEVICE_NOT_FOUND:
	134	return XEN_PCI_ERR_dev_not_found;
	135	case PCIBIOS_BAD_REGISTER_NUMBER:
	136	return XEN_PCI_ERR_invalid_offset;
	137	case PCIBIOS_FUNC_NOT_SUPPORTED:
	138	return XEN_PCI_ERR_not_implemented;
	139	case PCIBIOS_SET_FAILED:
	140	return XEN_PCI_ERR_access_denied;
	141	}
	142	return err;
	143	}
	144
a92336a1 KRW	145	int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
a92336a1 KRW	146	u32 *ret_val)
30edc14b KRW	147	{
30edc14b KRW	148	int err = 0;
a92336a1	149	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	150	const struct config_field_entry *cfg_entry;
30edc14b KRW	151	const struct config_field *field;
1ad6344a	152	int field_start, field_end;
30edc14b KRW	153	/* if read fails for any reason, return 0
	154	* (as if device didn't respond) */
	155	u32 value = 0, tmp_val;
	156
	157	if (unlikely(verbose_request))
a92336a1	158	printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x\n",
30edc14b KRW	159	pci_name(dev), size, offset);
	160
	161	if (!valid_request(offset, size)) {
	162	err = XEN_PCI_ERR_invalid_offset;
	163	goto out;
	164	}
	165
	166	/* Get the real value first, then modify as appropriate */
	167	switch (size) {
	168	case 1:
	169	err = pci_read_config_byte(dev, offset, (u8 *) &value);
	170	break;
	171	case 2:
	172	err = pci_read_config_word(dev, offset, (u16 *) &value);
	173	break;
	174	case 4:
	175	err = pci_read_config_dword(dev, offset, &value);
	176	break;
	177	}
	178
	179	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
	180	field = cfg_entry->field;
	181
30edc14b KRW	182	field_start = OFFSET(cfg_entry);
	183	field_end = OFFSET(cfg_entry) + field->size;
	184
1ad6344a	185	if (offset + size > field_start && field_end > offset) {
30edc14b KRW	186	err = conf_space_read(dev, cfg_entry, field_start,
	187	&tmp_val);
	188	if (err)
	189	goto out;
	190
	191	value = merge_value(value, tmp_val,
	192	get_mask(field->size),
1ad6344a	193	field_start - offset);
30edc14b KRW	194	}
	195	}
	196
	197	out:
	198	if (unlikely(verbose_request))
a92336a1	199	printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x = %x\n",
30edc14b KRW	200	pci_name(dev), size, offset, value);
	201
	202	*ret_val = value;
a6961651	203	return xen_pcibios_err_to_errno(err);
30edc14b KRW	204	}
30edc14b KRW	205
a92336a1	206	int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size, u32 value)
30edc14b KRW	207	{
30edc14b KRW	208	int err = 0, handled = 0;
a92336a1	209	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	210	const struct config_field_entry *cfg_entry;
	211	const struct config_field *field;
	212	u32 tmp_val;
1ad6344a	213	int field_start, field_end;
30edc14b KRW	214
	215	if (unlikely(verbose_request))
	216	printk(KERN_DEBUG
a92336a1	217	DRV_NAME ": %s: write request %d bytes at 0x%x = %x\n",
30edc14b KRW	218	pci_name(dev), size, offset, value);
	219
	220	if (!valid_request(offset, size))
	221	return XEN_PCI_ERR_invalid_offset;
	222
	223	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
	224	field = cfg_entry->field;
	225
30edc14b KRW	226	field_start = OFFSET(cfg_entry);
	227	field_end = OFFSET(cfg_entry) + field->size;
	228
1ad6344a	229	if (offset + size > field_start && field_end > offset) {
ee87d6d0 JB	230	err = conf_space_read(dev, cfg_entry, field_start,
ee87d6d0 JB	231	&tmp_val);
30edc14b KRW	232	if (err)
	233	break;
	234
	235	tmp_val = merge_value(tmp_val, value, get_mask(size),
1ad6344a	236	offset - field_start);
30edc14b KRW	237
	238	err = conf_space_write(dev, cfg_entry, field_start,
	239	tmp_val);
	240
	241	/* handled is set true here, but not every byte
	242	* may have been written! Properly detecting if
	243	* every byte is handled is unnecessary as the
	244	* flag is used to detect devices that need
	245	* special helpers to work correctly.
	246	*/
	247	handled = 1;
	248	}
	249	}
	250
	251	if (!handled && !err) {
	252	/* By default, anything not specificially handled above is
	253	* read-only. The permissive flag changes this behavior so
	254	* that anything not specifically handled above is writable.
	255	* This means that some fields may still be read-only because
	256	* they have entries in the config_field list that intercept
	257	* the write and do nothing. */
8014bcc8	258	if (dev_data->permissive \|\| xen_pcibk_permissive) {
30edc14b KRW	259	switch (size) {
	260	case 1:
	261	err = pci_write_config_byte(dev, offset,
	262	(u8) value);
	263	break;
	264	case 2:
	265	err = pci_write_config_word(dev, offset,
	266	(u16) value);
	267	break;
	268	case 4:
	269	err = pci_write_config_dword(dev, offset,
	270	(u32) value);
	271	break;
	272	}
	273	} else if (!dev_data->warned_on_write) {
	274	dev_data->warned_on_write = 1;
	275	dev_warn(&dev->dev, "Driver tried to write to a "
	276	"read-only configuration space field at offset"
	277	" 0x%x, size %d. This may be harmless, but if "
	278	"you have problems with your device:\n"
	279	"1) see permissive attribute in sysfs\n"
	280	"2) report problems to the xen-devel "
	281	"mailing list along with details of your "
	282	"device obtained from lspci.\n", offset, size);
	283	}
	284	}
	285
a6961651	286	return xen_pcibios_err_to_errno(err);
30edc14b KRW	287	}
30edc14b KRW	288
a92336a1	289	void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev)
30edc14b	290	{
a92336a1	291	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	292	struct config_field_entry cfg_entry, t;
	293	const struct config_field *field;
	294
	295	dev_dbg(&dev->dev, "free-ing dynamically allocated virtual "
	296	"configuration space fields\n");
	297	if (!dev_data)
	298	return;
	299
	300	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {
	301	field = cfg_entry->field;
	302
	303	if (field->clean) {
	304	field->clean((struct config_field *)field);
	305
	306	kfree(cfg_entry->data);
	307
	308	list_del(&cfg_entry->list);
	309	kfree(cfg_entry);
	310	}
	311
	312	}
	313	}
	314
a92336a1	315	void xen_pcibk_config_reset_dev(struct pci_dev *dev)
30edc14b	316	{
a92336a1	317	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	318	const struct config_field_entry *cfg_entry;
	319	const struct config_field *field;
	320
	321	dev_dbg(&dev->dev, "resetting virtual configuration space\n");
	322	if (!dev_data)
	323	return;
	324
	325	list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
	326	field = cfg_entry->field;
	327
	328	if (field->reset)
	329	field->reset(dev, OFFSET(cfg_entry), cfg_entry->data);
	330	}
	331	}
	332
a92336a1	333	void xen_pcibk_config_free_dev(struct pci_dev *dev)
30edc14b	334	{
a92336a1	335	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	336	struct config_field_entry cfg_entry, t;
	337	const struct config_field *field;
	338
	339	dev_dbg(&dev->dev, "free-ing virtual configuration space fields\n");
	340	if (!dev_data)
	341	return;
	342
	343	list_for_each_entry_safe(cfg_entry, t, &dev_data->config_fields, list) {
	344	list_del(&cfg_entry->list);
	345
	346	field = cfg_entry->field;
	347
	348	if (field->release)
	349	field->release(dev, OFFSET(cfg_entry), cfg_entry->data);
	350
	351	kfree(cfg_entry);
	352	}
	353	}
	354
a92336a1	355	int xen_pcibk_config_add_field_offset(struct pci_dev *dev,
30edc14b KRW	356	const struct config_field *field,
	357	unsigned int base_offset)
	358	{
	359	int err = 0;
a92336a1	360	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	361	struct config_field_entry *cfg_entry;
	362	void *tmp;
	363
	364	cfg_entry = kmalloc(sizeof(*cfg_entry), GFP_KERNEL);
	365	if (!cfg_entry) {
	366	err = -ENOMEM;
	367	goto out;
	368	}
	369
	370	cfg_entry->data = NULL;
	371	cfg_entry->field = field;
	372	cfg_entry->base_offset = base_offset;
	373
	374	/* silently ignore duplicate fields */
a92336a1	375	err = xen_pcibk_field_is_dup(dev, OFFSET(cfg_entry));
30edc14b KRW	376	if (err)
	377	goto out;
	378
	379	if (field->init) {
	380	tmp = field->init(dev, OFFSET(cfg_entry));
	381
	382	if (IS_ERR(tmp)) {
	383	err = PTR_ERR(tmp);
	384	goto out;
	385	}
	386
	387	cfg_entry->data = tmp;
	388	}
	389
	390	dev_dbg(&dev->dev, "added config field at offset 0x%02x\n",
	391	OFFSET(cfg_entry));
	392	list_add_tail(&cfg_entry->list, &dev_data->config_fields);
	393
	394	out:
	395	if (err)
	396	kfree(cfg_entry);
	397
	398	return err;
	399	}
	400
	401	/* This sets up the device's virtual configuration space to keep track of
	402	* certain registers (like the base address registers (BARs) so that we can
	403	* keep the client from manipulating them directly.
	404	*/
a92336a1	405	int xen_pcibk_config_init_dev(struct pci_dev *dev)
30edc14b KRW	406	{
30edc14b KRW	407	int err = 0;
a92336a1	408	struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
30edc14b KRW	409
	410	dev_dbg(&dev->dev, "initializing virtual configuration space\n");
	411
	412	INIT_LIST_HEAD(&dev_data->config_fields);
	413
a92336a1	414	err = xen_pcibk_config_header_add_fields(dev);
30edc14b KRW	415	if (err)
	416	goto out;
	417
a92336a1	418	err = xen_pcibk_config_capability_add_fields(dev);
30edc14b KRW	419	if (err)
	420	goto out;
	421
a92336a1	422	err = xen_pcibk_config_quirks_init(dev);
30edc14b KRW	423
	424	out:
	425	return err;
	426	}
	427
a92336a1	428	int xen_pcibk_config_init(void)
30edc14b	429	{
a92336a1	430	return xen_pcibk_config_capability_init();
30edc14b	431	}