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iommu/vt-d: Implement reserved region get/put callbacks

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This patch registers the [FEE0_0000h - FEF0_000h] 1MB MSI
range as a reserved region and RMRR regions as direct regions.

This will allow to report those reserved regions in the
iommu-group sysfs.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Eric Auger 2017-01-19 20:57:53 +00:00 committed by Will Deacon
parent bc7d12b91b
commit 0659b8dc45
1 changed files with 74 additions and 18 deletions
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92
drivers/iommu/intel-iommu.c
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@ -440,6 +440,7 @@ 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 {
@ -4246,27 +4247,40 @@ 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;
rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
if (!rmrru)
return -ENOMEM;
goto out;
rmrru->hdr = header;
rmrr = (struct acpi_dmar_reserved_memory *)header;
rmrru->base_address = rmrr->base_address;
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) {
kfree(rmrru);
return -ENOMEM;
}
if (rmrru->devices_cnt && rmrru->devices == NULL)
goto free_all;
list_add(&rmrru->list, &dmar_rmrr_units);
return 0;
free_all:
kfree(rmrru->resv);
free_rmrru:
kfree(rmrru);
out:
return -ENOMEM;
}
static struct dmar_atsr_unit *dmar_find_atsr(struct acpi_dmar_atsr *atsr)
@ -4480,6 +4494,7 @@ 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);
}
@ -5203,6 +5218,45 @@ static void intel_iommu_remove_device(struct device *dev)
iommu_device_unlink(iommu->iommu_dev, dev);
}
static void intel_iommu_get_resv_regions(struct device *device,
struct list_head *head)
{
struct iommu_resv_region *reg;
struct dmar_rmrr_unit *rmrr;
struct device *i_dev;
int i;
rcu_read_lock();
for_each_rmrr_units(rmrr) {
for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
i, i_dev) {
if (i_dev != device)
continue;
list_add_tail(&rmrr->resv->list, head);
}
}
rcu_read_unlock();
reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
0, IOMMU_RESV_RESERVED);
if (!reg)
return;
list_add_tail(&reg->list, head);
}
static void intel_iommu_put_resv_regions(struct device *dev,
struct list_head *head)
{
struct iommu_resv_region *entry, *next;
list_for_each_entry_safe(entry, next, head, list) {
if (entry->type == IOMMU_RESV_RESERVED)
kfree(entry);
}
}
#ifdef CONFIG_INTEL_IOMMU_SVM
#define MAX_NR_PASID_BITS (20)
static inline unsigned long intel_iommu_get_pts(struct intel_iommu *iommu)
@ -5333,19 +5387,21 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
#endif /* CONFIG_INTEL_IOMMU_SVM */
static const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
.domain_free = intel_iommu_domain_free,
.attach_dev = intel_iommu_attach_device,
.detach_dev = intel_iommu_detach_device,
.map = intel_iommu_map,
.unmap = intel_iommu_unmap,
.map_sg = default_iommu_map_sg,
.iova_to_phys = intel_iommu_iova_to_phys,
.add_device = intel_iommu_add_device,
.remove_device = intel_iommu_remove_device,
.device_group = pci_device_group,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
.domain_free = intel_iommu_domain_free,
.attach_dev = intel_iommu_attach_device,
.detach_dev = intel_iommu_detach_device,
.map = intel_iommu_map,
.unmap = intel_iommu_unmap,
.map_sg = default_iommu_map_sg,
.iova_to_phys = intel_iommu_iova_to_phys,
.add_device = intel_iommu_add_device,
.remove_device = intel_iommu_remove_device,
.get_resv_regions = intel_iommu_get_resv_regions,
.put_resv_regions = intel_iommu_put_resv_regions,
.device_group = pci_device_group,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};
static void quirk_iommu_g4x_gfx(struct pci_dev *dev)