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Date: Tue, 7 Jan 2014 17:00:28 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>,
David Woodhouse <dwmw2@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Dan Williams <dan.j.williams@...el.com>,
Vinod Koul <vinod.koul@...el.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>,
Ashok Raj <ashok.raj@...el.com>,
Yijing Wang <wangyijing@...wei.com>,
Tony Luck <tony.luck@...el.com>,
iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [Patch Part2 V1 08/14] 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: Jiang Liu <jiang.liu@...ux.intel.com>
---
drivers/iommu/dmar.c | 14 +++---
drivers/iommu/intel-iommu.c | 100 +++++++++++++++++++++----------------------
include/linux/dmar.h | 6 +++
3 files changed, 64 insertions(+), 56 deletions(-)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 4a4c9a1..ff33866 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -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;
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b0028e2..7e043ca 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -652,29 +652,31 @@ 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,
@@ -2329,17 +2331,19 @@ 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)
+ /*
+ * Return TRUE if this RMRR contains the device that
+ * is passed in.
+ */
+ for_each_active_dev_scope(rmrr->devices,
+ rmrr->devices_cnt, i, tmp)
+ if (tmp == dev) {
return true;
- }
+ }
}
return false;
}
@@ -2589,14 +2593,9 @@ 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
@@ -3282,13 +3281,14 @@ 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)
- break;
+ 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)
drhd->ignored = 1;
@@ -3296,15 +3296,13 @@ 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;
@@ -3314,11 +3312,9 @@ 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;
}
}
}
@@ -3554,9 +3550,9 @@ 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;
@@ -3577,22 +3573,24 @@ 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);
@@ -3606,7 +3604,7 @@ int __init dmar_parse_rmrr_atsr_dev(void)
return ret;
}
- return ret;
+ return 0;
}
/*
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index dc8c7d5..8aa7561 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -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 enable_drhd_fault_handling(void);
--
1.7.10.4
--
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