[deliverable/linux.git] / drivers / xen / xen-pciback / conf_space.c

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