drivers/pci/setup-res.c - kernel/msm-4.9 - Gitiles

 /*
  *	drivers/pci/setup-res.c
  *
  * Extruded from code written by
  *      Dave Rusling (david.rusling@reo.mts.dec.com)
  *      David Mosberger (davidm@cs.arizona.edu)
  *	David Miller (davem@redhat.com)
  *
  * Support routines for initializing a PCI subsystem.
  */

 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */

 /*
  * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
  *	     Resource sorting
  */

 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <linux/pci.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>
 #include <linux/cache.h>
 #include <linux/slab.h>
 #include "pci.h"


 void pci_update_resource(struct pci_dev *dev, int resno)
 {
 	struct pci_bus_region region;
 	bool disable;
 	u16 cmd;
 	u32 new, check, mask;
 	int reg;
 	enum pci_bar_type type;
 	struct resource *res = dev->resource + resno;

 	/*
 	 * Ignore resources for unimplemented BARs and unused resource slots
 	 * for 64 bit BARs.
 	 */
 	if (!res->flags)
 		return;

 	if (res->flags & IORESOURCE_UNSET)
 		return;

 	/*
 	 * Ignore non-moveable resources.  This might be legacy resources for
 	 * which no functional BAR register exists or another important
 	 * system resource we shouldn't move around.
 	 */
 	if (res->flags & IORESOURCE_PCI_FIXED)
 		return;

 	pcibios_resource_to_bus(dev->bus, &region, res);

 	new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
 	if (res->flags & IORESOURCE_IO)
 		mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
 	else
 		mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;

 	reg = pci_resource_bar(dev, resno, &type);
 	if (!reg)
 		return;
 	if (type != pci_bar_unknown) {
 		if (!(res->flags & IORESOURCE_ROM_ENABLE))
 			return;
 		new |= PCI_ROM_ADDRESS_ENABLE;
 	}

 	/*
 	 * We can't update a 64-bit BAR atomically, so when possible,
 	 * disable decoding so that a half-updated BAR won't conflict
 	 * with another device.
 	 */
 	disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on;
 	if (disable) {
 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
 		pci_write_config_word(dev, PCI_COMMAND,
 				      cmd & ~PCI_COMMAND_MEMORY);
 	}

 	pci_write_config_dword(dev, reg, new);
 	pci_read_config_dword(dev, reg, &check);

 	if ((new ^ check) & mask) {
 		dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
 			resno, new, check);
 	}

 	if (res->flags & IORESOURCE_MEM_64) {
 		new = region.start >> 16 >> 16;
 		pci_write_config_dword(dev, reg + 4, new);
 		pci_read_config_dword(dev, reg + 4, &check);
 		if (check != new) {
 			dev_err(&dev->dev, "BAR %d: error updating "
 			       "(high %#08x != %#08x)\n", resno, new, check);
 		}
 	}

 	if (disable)
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
 }

 int pci_claim_resource(struct pci_dev *dev, int resource)
 {
 	struct resource *res = &dev->resource[resource];
 	struct resource *root, *conflict;

 	if (res->flags & IORESOURCE_UNSET) {
 		dev_info(&dev->dev, "can't claim BAR %d %pR: no address assigned\n",
 			 resource, res);
 		return -EINVAL;
 	}

 	root = pci_find_parent_resource(dev, res);
 	if (!root) {
 		dev_info(&dev->dev, "can't claim BAR %d %pR: no compatible bridge window\n",
 			 resource, res);
 		return -EINVAL;
 	}

 	conflict = request_resource_conflict(root, res);
 	if (conflict) {
 		dev_info(&dev->dev, "can't claim BAR %d %pR: address conflict with %s %pR\n",
 			 resource, res, conflict->name, conflict);
 		return -EBUSY;
 	}

 	return 0;
 }
 EXPORT_SYMBOL(pci_claim_resource);

 void pci_disable_bridge_window(struct pci_dev *dev)
 {
 	dev_info(&dev->dev, "disabling bridge mem windows\n");

 	/* MMIO Base/Limit */
 	pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);

 	/* Prefetchable MMIO Base/Limit */
 	pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
 	pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
 	pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
 }

 /*
  * Generic function that returns a value indicating that the device's
  * original BIOS BAR address was not saved and so is not available for
  * reinstatement.
  *
  * Can be over-ridden by architecture specific code that implements
  * reinstatement functionality rather than leaving it disabled when
  * normal allocation attempts fail.
  */
 resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
 {
 	return 0;
 }

 static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
 		int resno, resource_size_t size)
 {
 	struct resource *root, *conflict;
 	resource_size_t fw_addr, start, end;
 	int ret = 0;

 	fw_addr = pcibios_retrieve_fw_addr(dev, resno);
 	if (!fw_addr)
 		return 1;

 	start = res->start;
 	end = res->end;
 	res->start = fw_addr;
 	res->end = res->start + size - 1;

 	root = pci_find_parent_resource(dev, res);
 	if (!root) {
 		if (res->flags & IORESOURCE_IO)
 			root = &ioport_resource;
 		else
 			root = &iomem_resource;
 	}

 	dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
 		 resno, res);
 	conflict = request_resource_conflict(root, res);
 	if (conflict) {
 		dev_info(&dev->dev,
 			 "BAR %d: %pR conflicts with %s %pR\n", resno,
 			 res, conflict->name, conflict);
 		res->start = start;
 		res->end = end;
 		ret = 1;
 	}
 	return ret;
 }

 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
 		int resno, resource_size_t size, resource_size_t align)
 {
 	struct resource *res = dev->resource + resno;
 	resource_size_t min;
 	int ret;

 	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

 	/* First, try exact prefetching match.. */
 	ret = pci_bus_alloc_resource(bus, res, size, align, min,
 				     IORESOURCE_PREFETCH,
 				     pcibios_align_resource, dev);

 	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 		/*
 		 * That failed.
 		 *
 		 * But a prefetching area can handle a non-prefetching
 		 * window (it will just not perform as well).
 		 */
 		ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 					     pcibios_align_resource, dev);
 	}
 	return ret;
 }

 static int _pci_assign_resource(struct pci_dev *dev, int resno,
 				resource_size_t size, resource_size_t min_align)
 {
 	struct resource *res = dev->resource + resno;
 	struct pci_bus *bus;
 	int ret;
 	char *type;

 	bus = dev->bus;
 	while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
 		if (!bus->parent || !bus->self->transparent)
 			break;
 		bus = bus->parent;
 	}

 	if (ret) {
 		if (res->flags & IORESOURCE_MEM)
 			if (res->flags & IORESOURCE_PREFETCH)
 				type = "mem pref";
 			else
 				type = "mem";
 		else if (res->flags & IORESOURCE_IO)
 			type = "io";
 		else
 			type = "unknown";
 		dev_info(&dev->dev,
 			 "BAR %d: can't assign %s (size %#llx)\n",
 			 resno, type, (unsigned long long) resource_size(res));
 	}

 	return ret;
 }

 int pci_assign_resource(struct pci_dev *dev, int resno)
 {
 	struct resource *res = dev->resource + resno;
 	resource_size_t align, size;
 	int ret;

 	res->flags |= IORESOURCE_UNSET;
 	align = pci_resource_alignment(dev, res);
 	if (!align) {
 		dev_info(&dev->dev, "BAR %d: can't assign %pR "
 			 "(bogus alignment)\n", resno, res);
 		return -EINVAL;
 	}

 	size = resource_size(res);
 	ret = _pci_assign_resource(dev, resno, size, align);

 	/*
 	 * If we failed to assign anything, let's try the address
 	 * where firmware left it.  That at least has a chance of
 	 * working, which is better than just leaving it disabled.
 	 */
 	if (ret < 0)
 		ret = pci_revert_fw_address(res, dev, resno, size);

 	if (!ret) {
 		res->flags &= ~IORESOURCE_UNSET;
 		res->flags &= ~IORESOURCE_STARTALIGN;
 		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
 			pci_update_resource(dev, resno);
 	}
 	return ret;
 }

 int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
 			resource_size_t min_align)
 {
 	struct resource *res = dev->resource + resno;
 	resource_size_t new_size;
 	int ret;

 	res->flags |= IORESOURCE_UNSET;
 	if (!res->parent) {
 		dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resource %pR "
 			 "\n", resno, res);
 		return -EINVAL;
 	}

 	/* already aligned with min_align */
 	new_size = resource_size(res) + addsize;
 	ret = _pci_assign_resource(dev, resno, new_size, min_align);
 	if (!ret) {
 		res->flags &= ~IORESOURCE_UNSET;
 		res->flags &= ~IORESOURCE_STARTALIGN;
 		dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
 			pci_update_resource(dev, resno);
 	}
 	return ret;
 }

 int pci_enable_resources(struct pci_dev *dev, int mask)
 {
 	u16 cmd, old_cmd;
 	int i;
 	struct resource *r;

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;

 	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 		if (!(mask & (1 << i)))
 			continue;

 		r = &dev->resource[i];

 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;
 		if ((i == PCI_ROM_RESOURCE) &&
 				(!(r->flags & IORESOURCE_ROM_ENABLE)))
 			continue;

 		if (!r->parent) {
 			dev_err(&dev->dev, "device not available "
 				"(can't reserve %pR)\n", r);
 			return -EINVAL;
 		}

 		if (r->flags & IORESOURCE_IO)
 			cmd |= PCI_COMMAND_IO;
 		if (r->flags & IORESOURCE_MEM)
 			cmd |= PCI_COMMAND_MEMORY;
 	}

 	if (cmd != old_cmd) {
 		dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
 			 old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
 	}
 	return 0;
 }
	/*
	* drivers/pci/setup-res.c
	*
	* Extruded from code written by
	* Dave Rusling (david.rusling@reo.mts.dec.com)
	* David Mosberger (davidm@cs.arizona.edu)
	* David Miller (davem@redhat.com)
	*
	* Support routines for initializing a PCI subsystem.
	*/

	/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */

	/*
	* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
	* Resource sorting
	*/

	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/export.h>
	#include <linux/pci.h>
	#include <linux/errno.h>
	#include <linux/ioport.h>
	#include <linux/cache.h>
	#include <linux/slab.h>
	#include "pci.h"


	void pci_update_resource(struct pci_dev *dev, int resno)
	{
	struct pci_bus_region region;
	bool disable;
	u16 cmd;
	u32 new, check, mask;
	int reg;
	enum pci_bar_type type;
	struct resource *res = dev->resource + resno;

	/*
	* Ignore resources for unimplemented BARs and unused resource slots
	* for 64 bit BARs.
	*/
	if (!res->flags)
	return;

	if (res->flags & IORESOURCE_UNSET)
	return;

	/*
	* Ignore non-moveable resources. This might be legacy resources for
	* which no functional BAR register exists or another important
	* system resource we shouldn't move around.
	*/
	if (res->flags & IORESOURCE_PCI_FIXED)
	return;

	pcibios_resource_to_bus(dev->bus, &region, res);

	new = region.start \| (res->flags & PCI_REGION_FLAG_MASK);
	if (res->flags & IORESOURCE_IO)
	mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
	else
	mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;

	reg = pci_resource_bar(dev, resno, &type);
	if (!reg)
	return;
	if (type != pci_bar_unknown) {
	if (!(res->flags & IORESOURCE_ROM_ENABLE))
	return;
	new \|= PCI_ROM_ADDRESS_ENABLE;
	}

	/*
	* We can't update a 64-bit BAR atomically, so when possible,
	* disable decoding so that a half-updated BAR won't conflict
	* with another device.
	*/
	disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on;
	if (disable) {
	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	pci_write_config_word(dev, PCI_COMMAND,
	cmd & ~PCI_COMMAND_MEMORY);
	}

	pci_write_config_dword(dev, reg, new);
	pci_read_config_dword(dev, reg, &check);

	if ((new ^ check) & mask) {
	dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
	resno, new, check);
	}

	if (res->flags & IORESOURCE_MEM_64) {
	new = region.start >> 16 >> 16;
	pci_write_config_dword(dev, reg + 4, new);
	pci_read_config_dword(dev, reg + 4, &check);
	if (check != new) {
	dev_err(&dev->dev, "BAR %d: error updating "
	"(high %#08x != %#08x)\n", resno, new, check);
	}
	}

	if (disable)
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	}

	int pci_claim_resource(struct pci_dev *dev, int resource)
	{
	struct resource *res = &dev->resource[resource];
	struct resource root, conflict;

	if (res->flags & IORESOURCE_UNSET) {
	dev_info(&dev->dev, "can't claim BAR %d %pR: no address assigned\n",
	resource, res);
	return -EINVAL;
	}

	root = pci_find_parent_resource(dev, res);
	if (!root) {
	dev_info(&dev->dev, "can't claim BAR %d %pR: no compatible bridge window\n",
	resource, res);
	return -EINVAL;
	}

	conflict = request_resource_conflict(root, res);
	if (conflict) {
	dev_info(&dev->dev, "can't claim BAR %d %pR: address conflict with %s %pR\n",
	resource, res, conflict->name, conflict);
	return -EBUSY;
	}

	return 0;
	}
	EXPORT_SYMBOL(pci_claim_resource);

	void pci_disable_bridge_window(struct pci_dev *dev)
	{
	dev_info(&dev->dev, "disabling bridge mem windows\n");

	/* MMIO Base/Limit */
	pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);

	/* Prefetchable MMIO Base/Limit */
	pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
	pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
	pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
	}

	/*
	* Generic function that returns a value indicating that the device's
	* original BIOS BAR address was not saved and so is not available for
	* reinstatement.
	*
	* Can be over-ridden by architecture specific code that implements
	* reinstatement functionality rather than leaving it disabled when
	* normal allocation attempts fail.
	*/
	resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
	{
	return 0;
	}

	static int pci_revert_fw_address(struct resource res, struct pci_dev dev,
	int resno, resource_size_t size)
	{
	struct resource root, conflict;
	resource_size_t fw_addr, start, end;
	int ret = 0;

	fw_addr = pcibios_retrieve_fw_addr(dev, resno);
	if (!fw_addr)
	return 1;

	start = res->start;
	end = res->end;
	res->start = fw_addr;
	res->end = res->start + size - 1;

	root = pci_find_parent_resource(dev, res);
	if (!root) {
	if (res->flags & IORESOURCE_IO)
	root = &ioport_resource;
	else
	root = &iomem_resource;
	}

	dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
	resno, res);
	conflict = request_resource_conflict(root, res);
	if (conflict) {
	dev_info(&dev->dev,
	"BAR %d: %pR conflicts with %s %pR\n", resno,
	res, conflict->name, conflict);
	res->start = start;
	res->end = end;
	ret = 1;
	}
	return ret;
	}

	static int __pci_assign_resource(struct pci_bus bus, struct pci_dev dev,
	int resno, resource_size_t size, resource_size_t align)
	{
	struct resource *res = dev->resource + resno;
	resource_size_t min;
	int ret;

	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

	/* First, try exact prefetching match.. */
	ret = pci_bus_alloc_resource(bus, res, size, align, min,
	IORESOURCE_PREFETCH,
	pcibios_align_resource, dev);

	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
	/*
	* That failed.
	*
	* But a prefetching area can handle a non-prefetching
	* window (it will just not perform as well).
	*/
	ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
	pcibios_align_resource, dev);
	}
	return ret;
	}

	static int _pci_assign_resource(struct pci_dev *dev, int resno,
	resource_size_t size, resource_size_t min_align)
	{
	struct resource *res = dev->resource + resno;
	struct pci_bus *bus;
	int ret;
	char *type;

	bus = dev->bus;
	while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
	if (!bus->parent \|\| !bus->self->transparent)
	break;
	bus = bus->parent;
	}

	if (ret) {
	if (res->flags & IORESOURCE_MEM)
	if (res->flags & IORESOURCE_PREFETCH)
	type = "mem pref";
	else
	type = "mem";
	else if (res->flags & IORESOURCE_IO)
	type = "io";
	else
	type = "unknown";
	dev_info(&dev->dev,
	"BAR %d: can't assign %s (size %#llx)\n",
	resno, type, (unsigned long long) resource_size(res));
	}

	return ret;
	}

	int pci_assign_resource(struct pci_dev *dev, int resno)
	{
	struct resource *res = dev->resource + resno;
	resource_size_t align, size;
	int ret;

	res->flags \|= IORESOURCE_UNSET;
	align = pci_resource_alignment(dev, res);
	if (!align) {
	dev_info(&dev->dev, "BAR %d: can't assign %pR "
	"(bogus alignment)\n", resno, res);
	return -EINVAL;
	}

	size = resource_size(res);
	ret = _pci_assign_resource(dev, resno, size, align);

	/*
	* If we failed to assign anything, let's try the address
	* where firmware left it. That at least has a chance of
	* working, which is better than just leaving it disabled.
	*/
	if (ret < 0)
	ret = pci_revert_fw_address(res, dev, resno, size);

	if (!ret) {
	res->flags &= ~IORESOURCE_UNSET;
	res->flags &= ~IORESOURCE_STARTALIGN;
	dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
	if (resno < PCI_BRIDGE_RESOURCES)
	pci_update_resource(dev, resno);
	}
	return ret;
	}

	int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
	resource_size_t min_align)
	{
	struct resource *res = dev->resource + resno;
	resource_size_t new_size;
	int ret;

	res->flags \|= IORESOURCE_UNSET;
	if (!res->parent) {
	dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resource %pR "
	"\n", resno, res);
	return -EINVAL;
	}

	/* already aligned with min_align */
	new_size = resource_size(res) + addsize;
	ret = _pci_assign_resource(dev, resno, new_size, min_align);
	if (!ret) {
	res->flags &= ~IORESOURCE_UNSET;
	res->flags &= ~IORESOURCE_STARTALIGN;
	dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
	if (resno < PCI_BRIDGE_RESOURCES)
	pci_update_resource(dev, resno);
	}
	return ret;
	}

	int pci_enable_resources(struct pci_dev *dev, int mask)
	{
	u16 cmd, old_cmd;
	int i;
	struct resource *r;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	old_cmd = cmd;

	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	if (!(mask & (1 << i)))
	continue;

	r = &dev->resource[i];

	if (!(r->flags & (IORESOURCE_IO \| IORESOURCE_MEM)))
	continue;
	if ((i == PCI_ROM_RESOURCE) &&
	(!(r->flags & IORESOURCE_ROM_ENABLE)))
	continue;

	if (!r->parent) {
	dev_err(&dev->dev, "device not available "
	"(can't reserve %pR)\n", r);
	return -EINVAL;
	}

	if (r->flags & IORESOURCE_IO)
	cmd \|= PCI_COMMAND_IO;
	if (r->flags & IORESOURCE_MEM)
	cmd \|= PCI_COMMAND_MEMORY;
	}

	if (cmd != old_cmd) {
	dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
	old_cmd, cmd);
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	}
	return 0;
	}