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iommu/vt-d: Duplicate iommu_resv_region objects per device list 

intel_iommu_get_resv_regions() aims to return the list of
reserved regions accessible by a given @device. However several
devices can access the same reserved memory region and when
building the list it is not safe to use a single iommu_resv_region
object, whose container is the RMRR. This iommu_resv_region must
be duplicated per device reserved region list.

Let's remove the struct iommu_resv_region from the RMRR unit
and allocate the iommu_resv_region directly in
intel_iommu_get_resv_regions(). We hold the dmar_global_lock instead
of the rcu-lock to allow sleeping.

Fixes: 0659b8dc45 ("iommu/vt-d: Implement reserved region get/put callbacks")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Eric Auger 2019-06-03 08:53:31 +02:00 committed by Joerg Roedel
parent ad0834deda
commit 5f64ce5411
1 changed files with 17 additions and 17 deletions
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34
drivers/iommu/intel-iommu.c
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@ -324,7 +324,6 @@ struct dmar_rmrr_unit {
u64 end_address; /* reserved end address */
struct dmar_dev_scope *devices; /* target devices */
int devices_cnt; /* target device count */
struct iommu_resv_region *resv; /* reserved region handle */
};
struct dmar_atsr_unit {
@ -4050,7 +4049,6 @@ static inline void init_iommu_pm_ops(void) {}
int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
{
struct acpi_dmar_reserved_memory *rmrr;
int prot = DMA_PTE_READ|DMA_PTE_WRITE;
struct dmar_rmrr_unit *rmrru;
size_t length;
@ -4064,22 +4062,16 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
rmrru->end_address = rmrr->end_address;
length = rmrr->end_address - rmrr->base_address + 1;
rmrru->resv = iommu_alloc_resv_region(rmrr->base_address, length, prot,
IOMMU_RESV_DIRECT);
if (!rmrru->resv)
goto free_rmrru;
rmrru->devices = dmar_alloc_dev_scope((void *)(rmrr + 1),
((void *)rmrr) + rmrr->header.length,
&rmrru->devices_cnt);
if (rmrru->devices_cnt && rmrru->devices == NULL)
goto free_all;
goto free_rmrru;
list_add(&rmrru->list, &dmar_rmrr_units);
return 0;
free_all:
kfree(rmrru->resv);
free_rmrru:
kfree(rmrru);
out:
@ -4297,7 +4289,6 @@ static void intel_iommu_free_dmars(void)
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->resv);
kfree(rmrru);
}
@ -5400,22 +5391,33 @@ static void intel_iommu_remove_device(struct device *dev)
static void intel_iommu_get_resv_regions(struct device *device,
struct list_head *head)
{
int prot = DMA_PTE_READ | DMA_PTE_WRITE;
struct iommu_resv_region *reg;
struct dmar_rmrr_unit *rmrr;
struct device *i_dev;
int i;
rcu_read_lock();
down_read(&dmar_global_lock);
for_each_rmrr_units(rmrr) {
for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
i, i_dev) {
struct iommu_resv_region *resv;
size_t length;
if (i_dev != device)
continue;
list_add_tail(&rmrr->resv->list, head);
length = rmrr->end_address - rmrr->base_address + 1;
resv = iommu_alloc_resv_region(rmrr->base_address,
length, prot,
IOMMU_RESV_DIRECT);
if (!resv)
break;
list_add_tail(&resv->list, head);
}
}
rcu_read_unlock();
up_read(&dmar_global_lock);
#ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA
if (dev_is_pci(device)) {
@ -5443,10 +5445,8 @@ static void intel_iommu_put_resv_regions(struct device *dev,
{
struct iommu_resv_region *entry, *next;
list_for_each_entry_safe(entry, next, head, list) {
if (entry->type == IOMMU_RESV_MSI)
kfree(entry);
}
list_for_each_entry_safe(entry, next, head, list)
kfree(entry);
}
int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev)