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Commit b683b230 authored by Jiang Liu's avatar Jiang Liu Committed by Joerg Roedel
Browse files

iommu/vt-d: Introduce macro for_each_dev_scope() to walk device scope entries 



Introduce for_each_dev_scope()/for_each_active_dev_scope() to walk
{active} device scope entries. This will help following RCU lock
related patches.

Signed-off-by: default avatarJiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent b5f82ddf

drivers/iommu/dmar.c

+9 −5
Original line number Diff line number Diff line
@@ -170,9 +170,12 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt, 


void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt)

{

	int i;

	struct pci_dev *tmp_dev;



	if (*devices && *cnt) {

		while (--*cnt >= 0)

			pci_dev_put((*devices)[*cnt]);

		for_each_active_dev_scope(*devices, *cnt, i, tmp_dev)

			pci_dev_put(tmp_dev);

		kfree(*devices);

		*devices = NULL;

		*cnt = 0;
@@ -402,10 +405,11 @@ static int dmar_pci_device_match(struct pci_dev *devices[], int cnt, 
			  struct pci_dev *dev)

{

	int index;

	struct pci_dev *tmp;



	while (dev) {

		for (index = 0; index < cnt; index++)

			if (dev == devices[index])

		for_each_active_dev_scope(devices, cnt, index, tmp)

			if (dev == tmp)

				return 1;



		/* Check our parent */
@@ -452,7 +456,7 @@ int __init dmar_dev_scope_init(void) 
	if (list_empty(&dmar_drhd_units))

		goto fail;



	list_for_each_entry(drhd, &dmar_drhd_units, list) {

	for_each_drhd_unit(drhd) {

		ret = dmar_parse_dev(drhd);

		if (ret)

			goto fail;

drivers/iommu/intel-iommu.c

+49 −51
Original line number Diff line number Diff line
@@ -654,29 +654,31 @@ static void domain_update_iommu_cap(struct dmar_domain *domain) 
static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)

{

	struct dmar_drhd_unit *drhd = NULL;

	struct intel_iommu *iommu;

	struct pci_dev *dev;

	int i;



	for_each_active_drhd_unit(drhd) {

	for_each_active_iommu(iommu, drhd) {

		if (segment != drhd->segment)

			continue;



		for (i = 0; i < drhd->devices_cnt; i++) {

			if (drhd->devices[i] &&

			    drhd->devices[i]->bus->number == bus &&

			    drhd->devices[i]->devfn == devfn)

				return drhd->iommu;

			if (drhd->devices[i] &&

			    drhd->devices[i]->subordinate &&

			    drhd->devices[i]->subordinate->number <= bus &&

			    drhd->devices[i]->subordinate->busn_res.end >= bus)

				return drhd->iommu;

		for_each_active_dev_scope(drhd->devices,

					  drhd->devices_cnt, i, dev) {

			if (dev->bus->number == bus && dev->devfn == devfn)

				goto out;

			if (dev->subordinate &&

			    dev->subordinate->number <= bus &&

			    dev->subordinate->busn_res.end >= bus)

				goto out;

		}



		if (drhd->include_all)

			return drhd->iommu;

			goto out;

	}

	iommu = NULL;

out:



	return NULL;

	return iommu;

}



static void domain_flush_cache(struct dmar_domain *domain,
@@ -2333,15 +2335,17 @@ static int domain_add_dev_info(struct dmar_domain *domain, 
static bool device_has_rmrr(struct pci_dev *dev)

{

	struct dmar_rmrr_unit *rmrr;

	struct pci_dev *tmp;

	int i;



	for_each_rmrr_units(rmrr) {

		for (i = 0; i < rmrr->devices_cnt; i++) {

		/*

		 * Return TRUE if this RMRR contains the device that

		 * is passed in.

		 */

			if (rmrr->devices[i] == dev)

		for_each_active_dev_scope(rmrr->devices,

					  rmrr->devices_cnt, i, tmp)

			if (tmp == dev) {

				return true;

			}

	}
@@ -2593,14 +2597,9 @@ static int __init init_dmars(void) 
	 */

	printk(KERN_INFO "IOMMU: Setting RMRR:\n");

	for_each_rmrr_units(rmrr) {

		for (i = 0; i < rmrr->devices_cnt; i++) {

			pdev = rmrr->devices[i];

			/*

			 * some BIOS lists non-exist devices in DMAR

			 * table.

			 */

			if (!pdev)

				continue;

		/* some BIOS lists non-exist devices in DMAR table. */

		for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,

					  i, pdev) {

			ret = iommu_prepare_rmrr_dev(rmrr, pdev);

			if (ret)

				printk(KERN_ERR
@@ -3288,12 +3287,13 @@ DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quir 
static void __init init_no_remapping_devices(void)

{

	struct dmar_drhd_unit *drhd;

	struct pci_dev *dev;

	int i;



	for_each_drhd_unit(drhd) {

		if (!drhd->include_all) {

			int i;

			for (i = 0; i < drhd->devices_cnt; i++)

				if (drhd->devices[i] != NULL)

			for_each_active_dev_scope(drhd->devices,

						  drhd->devices_cnt, i, dev)

				break;

			/* ignore DMAR unit if no pci devices exist */

			if (i == drhd->devices_cnt)
@@ -3302,15 +3302,13 @@ static void __init init_no_remapping_devices(void) 
	}



	for_each_active_drhd_unit(drhd) {

		int i;

		if (drhd->include_all)

			continue;



		for (i = 0; i < drhd->devices_cnt; i++)

			if (drhd->devices[i] &&

			    !IS_GFX_DEVICE(drhd->devices[i]))

		for_each_active_dev_scope(drhd->devices,

					  drhd->devices_cnt, i, dev)

			if (!IS_GFX_DEVICE(dev))

				break;



		if (i < drhd->devices_cnt)

			continue;
@@ -3320,11 +3318,9 @@ static void __init init_no_remapping_devices(void) 
			intel_iommu_gfx_mapped = 1;

		} else {

			drhd->ignored = 1;

			for (i = 0; i < drhd->devices_cnt; i++) {

				if (!drhd->devices[i])

					continue;

				drhd->devices[i]->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;

			}

			for_each_active_dev_scope(drhd->devices,

						  drhd->devices_cnt, i, dev)

				dev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;

		}

	}

}
@@ -3560,9 +3556,9 @@ static void intel_iommu_free_dmars(void) 


int dmar_find_matched_atsr_unit(struct pci_dev *dev)

{

	int i;

	int i, ret = 1;

	struct pci_bus *bus;

	struct pci_dev *bridge = NULL;

	struct pci_dev *bridge = NULL, *tmp;

	struct acpi_dmar_atsr *atsr;

	struct dmar_atsr_unit *atsru;
@@ -3583,22 +3579,24 @@ int dmar_find_matched_atsr_unit(struct pci_dev *dev) 
		if (atsr->segment != pci_domain_nr(dev->bus))

			continue;



		for (i = 0; i < atsru->devices_cnt; i++)

			if (atsru->devices[i] == bridge)

				return 1;

		for_each_dev_scope(atsru->devices, atsru->devices_cnt, i, tmp)

			if (tmp == bridge)

				goto out;



		if (atsru->include_all)

			return 1;

			goto out;

	}

	ret = 0;

out:



	return 0;

	return ret;

}



int __init dmar_parse_rmrr_atsr_dev(void)

{

	struct dmar_rmrr_unit *rmrr;

	struct dmar_atsr_unit *atsr;

	int ret = 0;

	int ret;



	list_for_each_entry(rmrr, &dmar_rmrr_units, list) {

		ret = rmrr_parse_dev(rmrr);
@@ -3612,7 +3610,7 @@ int __init dmar_parse_rmrr_atsr_dev(void) 
			return ret;

	}



	return ret;

	return 0;

}



/*

include/linux/dmar.h

+6 −0
Original line number Diff line number Diff line
@@ -65,6 +65,12 @@ extern struct list_head dmar_drhd_units; 
	list_for_each_entry(drhd, &dmar_drhd_units, list)		\

		if (i=drhd->iommu, 0) {} else 



#define	for_each_dev_scope(a, c, p, d)	\

	for ((p) = 0; ((d) = (p) < (c) ? (a)[(p)] : NULL, (p) < (c)); (p)++)



#define	for_each_active_dev_scope(a, c, p, d)	\

	for_each_dev_scope((a), (c), (p), (d))	if (!(d)) { continue; } else



extern int dmar_table_init(void);

extern int dmar_dev_scope_init(void);

extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,