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Date:   Thu, 16 May 2019 10:47:14 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        dwmw2@...radead.org, lorenzo.pieralisi@....com,
        robin.murphy@....com, will.deacon@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com
Cc:     alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com
Subject: [PATCH v2 1/7] iommu: Pass a GFP flag parameter to iommu_alloc_resv_region()

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@...hat.com>
---
 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 9058cb084b91..8313b2d1b710 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 09c9e45f7fa2..f2eb8e9cd8a6 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3136,7 +3136,8 @@ 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;
@@ -3146,14 +3147,14 @@ 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 4d5a694f02c2..f9b1279ef5bf 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2226,7 +2226,7 @@ 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 5e54cc0a28b3..646e76813e91 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1670,7 +1670,7 @@ 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 a209199f3af6..2be36dff189a 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4220,7 +4220,7 @@ 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;
 
@@ -5489,7 +5489,7 @@ 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 67ee6623f9b2..ae4ea5c0e6f9 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -256,7 +256,7 @@ 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;
 
@@ -1891,11 +1891,12 @@ 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 a815cf6f6f47..ba91666998fb 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -364,7 +364,7 @@ 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

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