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Date: Mon, 6 Jan 2014 14:18:27 +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>,
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 Part1 V3 20/20] iommu/vt-d: free all resources if failed to initialize DMARs
Enhance intel_iommu_init() to free all resources if failed to
initialize DMAR hardware.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
drivers/iommu/intel-iommu.c | 81 ++++++++++++++++++++++++++-----------------
1 file changed, 49 insertions(+), 32 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c28e9fe..0863e25 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2615,6 +2615,7 @@ static int __init init_dmars(void)
error:
for_each_active_iommu(iommu, drhd)
free_dmar_iommu(iommu);
+ kfree(deferred_flush);
kfree(g_iommus);
g_iommus = NULL;
return ret;
@@ -3459,18 +3460,12 @@ static int __init
rmrr_parse_dev(struct dmar_rmrr_unit *rmrru)
{
struct acpi_dmar_reserved_memory *rmrr;
- int ret;
rmrr = (struct acpi_dmar_reserved_memory *) rmrru->hdr;
- ret = dmar_parse_dev_scope((void *)(rmrr + 1),
- ((void *)rmrr) + rmrr->header.length,
- &rmrru->devices_cnt, &rmrru->devices, rmrr->segment);
-
- if (ret || (rmrru->devices_cnt == 0)) {
- list_del(&rmrru->list);
- kfree(rmrru);
- }
- return ret;
+ return dmar_parse_dev_scope((void *)(rmrr + 1),
+ ((void *)rmrr) + rmrr->header.length,
+ &rmrru->devices_cnt, &rmrru->devices,
+ rmrr->segment);
}
static LIST_HEAD(dmar_atsr_units);
@@ -3495,23 +3490,39 @@ int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr)
static int __init atsr_parse_dev(struct dmar_atsr_unit *atsru)
{
- int rc;
struct acpi_dmar_atsr *atsr;
if (atsru->include_all)
return 0;
atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
- rc = dmar_parse_dev_scope((void *)(atsr + 1),
- (void *)atsr + atsr->header.length,
- &atsru->devices_cnt, &atsru->devices,
- atsr->segment);
- if (rc || !atsru->devices_cnt) {
- list_del(&atsru->list);
- kfree(atsru);
+ return dmar_parse_dev_scope((void *)(atsr + 1),
+ (void *)atsr + atsr->header.length,
+ &atsru->devices_cnt, &atsru->devices,
+ atsr->segment);
+}
+
+static void intel_iommu_free_atsr(struct dmar_atsr_unit *atsru)
+{
+ dmar_free_dev_scope(&atsru->devices, &atsru->devices_cnt);
+ kfree(atsru);
+}
+
+static void intel_iommu_free_dmars(void)
+{
+ struct dmar_rmrr_unit *rmrru, *rmrr_n;
+ struct dmar_atsr_unit *atsru, *atsr_n;
+
+ list_for_each_entry_safe(rmrru, rmrr_n, &dmar_rmrr_units, list) {
+ list_del(&rmrru->list);
+ dmar_free_dev_scope(&rmrru->devices, &rmrru->devices_cnt);
+ kfree(rmrru);
}
- return rc;
+ list_for_each_entry_safe(atsru, atsr_n, &dmar_atsr_units, list) {
+ list_del(&atsru->list);
+ intel_iommu_free_atsr(atsru);
+ }
}
int dmar_find_matched_atsr_unit(struct pci_dev *dev)
@@ -3555,17 +3566,17 @@ found:
int __init dmar_parse_rmrr_atsr_dev(void)
{
- struct dmar_rmrr_unit *rmrr, *rmrr_n;
- struct dmar_atsr_unit *atsr, *atsr_n;
+ struct dmar_rmrr_unit *rmrr;
+ struct dmar_atsr_unit *atsr;
int ret = 0;
- list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {
+ list_for_each_entry(rmrr, &dmar_rmrr_units, list) {
ret = rmrr_parse_dev(rmrr);
if (ret)
return ret;
}
- list_for_each_entry_safe(atsr, atsr_n, &dmar_atsr_units, list) {
+ list_for_each_entry(atsr, &dmar_atsr_units, list) {
ret = atsr_parse_dev(atsr);
if (ret)
return ret;
@@ -3612,7 +3623,7 @@ static struct notifier_block device_nb = {
int __init intel_iommu_init(void)
{
- int ret = 0;
+ int ret = -ENODEV;
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
@@ -3622,7 +3633,7 @@ int __init intel_iommu_init(void)
if (dmar_table_init()) {
if (force_on)
panic("tboot: Failed to initialize DMAR table\n");
- return -ENODEV;
+ goto out_free_dmar;
}
/*
@@ -3635,16 +3646,16 @@ int __init intel_iommu_init(void)
if (dmar_dev_scope_init() < 0) {
if (force_on)
panic("tboot: Failed to initialize DMAR device scope\n");
- return -ENODEV;
+ goto out_free_dmar;
}
if (no_iommu || dmar_disabled)
- return -ENODEV;
+ goto out_free_dmar;
if (iommu_init_mempool()) {
if (force_on)
panic("tboot: Failed to initialize iommu memory\n");
- return -ENODEV;
+ goto out_free_dmar;
}
if (list_empty(&dmar_rmrr_units))
@@ -3656,7 +3667,7 @@ int __init intel_iommu_init(void)
if (dmar_init_reserved_ranges()) {
if (force_on)
panic("tboot: Failed to reserve iommu ranges\n");
- return -ENODEV;
+ goto out_free_mempool;
}
init_no_remapping_devices();
@@ -3666,9 +3677,7 @@ int __init intel_iommu_init(void)
if (force_on)
panic("tboot: Failed to initialize DMARs\n");
printk(KERN_ERR "IOMMU: dmar init failed\n");
- put_iova_domain(&reserved_iova_list);
- iommu_exit_mempool();
- return ret;
+ goto out_free_reserved_range;
}
printk(KERN_INFO
"PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n");
@@ -3688,6 +3697,14 @@ int __init intel_iommu_init(void)
intel_iommu_enabled = 1;
return 0;
+
+out_free_reserved_range:
+ put_iova_domain(&reserved_iova_list);
+out_free_mempool:
+ iommu_exit_mempool();
+out_free_dmar:
+ intel_iommu_free_dmars();
+ return ret;
}
static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
--
1.7.10.4
--
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