[PATCH 1/4] iommu: Pass a GFP flag parameter to iommu_alloc_resv_region()

From: Eric Auger
Date: Mon May 13 2019 - 03:14:46 EST

We plan to call iommu_alloc_resv_region in a non preemptible section.
Pass a GFP flag to the function and update all the call sites.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
drivers/acpi/arm64/iort.c | 3 ++-
drivers/iommu/amd_iommu.c | 7 ++++---
drivers/iommu/arm-smmu-v3.c | 2 +-
drivers/iommu/arm-smmu.c | 2 +-
drivers/iommu/intel-iommu.c | 4 ++--
drivers/iommu/iommu.c | 7 ++++---
include/linux/iommu.h | 2 +-
7 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index adbf7cbedf80..20b56ae91513 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -868,7 +868,8 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
struct iommu_resv_region *region;

region = iommu_alloc_resv_region(base + SZ_64K, SZ_64K,
- prot, IOMMU_RESV_MSI);
+ prot, IOMMU_RESV_MSI,
+ GFP_KERNEL);
if (region) {
list_add_tail(&region->list, head);
resv++;
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f7cdd2ab7f11..a9aab13a9487 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3186,7 +3186,8 @@ static void amd_iommu_get_resv_regions(struct device *dev,
type = IOMMU_RESV_RESERVED;

region = iommu_alloc_resv_region(entry->address_start,
- length, prot, type);
+ length, prot, type,
+ GFP_KERNEL);
if (!region) {
dev_err(dev, "Out of memory allocating dm-regions\n");
return;
@@ -3196,14 +3197,14 @@ static void amd_iommu_get_resv_regions(struct device *dev,

region = iommu_alloc_resv_region(MSI_RANGE_START,
MSI_RANGE_END - MSI_RANGE_START + 1,
- 0, IOMMU_RESV_MSI);
+ 0, IOMMU_RESV_MSI, GFP_KERNEL);
if (!region)
return;
list_add_tail(&region->list, head);

region = iommu_alloc_resv_region(HT_RANGE_START,
HT_RANGE_END - HT_RANGE_START + 1,
- 0, IOMMU_RESV_RESERVED);
+ 0, IOMMU_RESV_RESERVED, GFP_KERNEL);
if (!region)
return;
list_add_tail(&region->list, head);
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d3880010c6cf..5aae50c811b3 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2031,7 +2031,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;

region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
- prot, IOMMU_RESV_SW_MSI);
+ prot, IOMMU_RESV_SW_MSI, GFP_KERNEL);
if (!region)
return;

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 045d93884164..3c28bc0555d4 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1667,7 +1667,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;

region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
- prot, IOMMU_RESV_SW_MSI);
+ prot, IOMMU_RESV_SW_MSI, GFP_KERNEL);
if (!region)
return;

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 28cb713d728c..2075abdb174d 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4221,7 +4221,7 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)

length = rmrr->end_address - rmrr->base_address + 1;
rmrru->resv = iommu_alloc_resv_region(rmrr->base_address, length, prot,
- IOMMU_RESV_DIRECT);
+ IOMMU_RESV_DIRECT, GFP_KERNEL);
if (!rmrru->resv)
goto free_rmrru;

@@ -5290,7 +5290,7 @@ static void intel_iommu_get_resv_regions(struct device *device,

reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
- 0, IOMMU_RESV_MSI);
+ 0, IOMMU_RESV_MSI, GFP_KERNEL);
if (!reg)
return;
list_add_tail(&reg->list, head);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 109de67d5d72..b0598c202e11 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -260,7 +260,7 @@ static int iommu_insert_resv_region(struct iommu_resv_region *new,
}
insert:
region = iommu_alloc_resv_region(new->start, new->length,
- new->prot, new->type);
+ new->prot, new->type, GFP_KERNEL);
if (!region)
return -ENOMEM;

@@ -1898,11 +1898,12 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)

struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
size_t length, int prot,
- enum iommu_resv_type type)
+ enum iommu_resv_type type,
+ gfp_t flags)
{
struct iommu_resv_region *region;

- region = kzalloc(sizeof(*region), GFP_KERNEL);
+ region = kzalloc(sizeof(*region), flags);
if (!region)
return NULL;

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ffbbc7e39cee..c9cc8be6840b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -310,7 +310,7 @@ extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
extern int iommu_request_dm_for_dev(struct device *dev);
extern struct iommu_resv_region *
iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
- enum iommu_resv_type type);
+ enum iommu_resv_type type, gfp_t flags);
extern int iommu_get_group_resv_regions(struct iommu_group *group,
struct list_head *head);

--
2.20.1