Re: [PATCH 2/3] iommu: Make .release_device optional

2022-06-21 Thread Baolu Lu

On 2022/6/21 23:14, Robin Murphy wrote:

Many drivers do nothing meaningful for .release_device, and it's neatly
abstracted to just two callsites in the core code, so let's make it
optional to implement.

Signed-off-by: Robin Murphy 
---
  drivers/iommu/fsl_pamu_domain.c | 5 -
  drivers/iommu/iommu.c   | 6 --
  drivers/iommu/msm_iommu.c   | 5 -
  drivers/iommu/sun50i-iommu.c| 3 ---
  drivers/iommu/tegra-gart.c  | 5 -
  drivers/iommu/tegra-smmu.c  | 3 ---
  6 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 94b4589dc67c..011f9ab7f743 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -447,15 +447,10 @@ static struct iommu_device *fsl_pamu_probe_device(struct 
device *dev)
return _iommu;
  }
  
-static void fsl_pamu_release_device(struct device *dev)

-{
-}
-
  static const struct iommu_ops fsl_pamu_ops = {
.capable= fsl_pamu_capable,
.domain_alloc   = fsl_pamu_domain_alloc,
.probe_device   = fsl_pamu_probe_device,
-   .release_device = fsl_pamu_release_device,
.device_group   = fsl_pamu_device_group,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = fsl_pamu_attach_device,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 06d6989f07f6..8b4fc7e62b99 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -259,7 +259,8 @@ static int __iommu_probe_device(struct device *dev, struct 
list_head *group_list
return 0;
  
  out_release:

-   ops->release_device(dev);
+   if (ops->release_device)
+   ops->release_device(dev);
  
  out_module_put:

module_put(ops->owner);
@@ -337,7 +338,8 @@ void iommu_release_device(struct device *dev)
iommu_device_unlink(dev->iommu->iommu_dev, dev);
  
  	ops = dev_iommu_ops(dev);

-   ops->release_device(dev);
+   if (ops->release_device)
+   ops->release_device(dev);
  
  	iommu_group_remove_device(dev);

module_put(ops->owner);
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index f09aedfdd462..428919a474c1 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -394,10 +394,6 @@ static struct iommu_device *msm_iommu_probe_device(struct 
device *dev)
return >iommu;
  }
  
-static void msm_iommu_release_device(struct device *dev)

-{
-}
-
  static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device 
*dev)
  {
int ret = 0;
@@ -677,7 +673,6 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
  static struct iommu_ops msm_iommu_ops = {
.domain_alloc = msm_iommu_domain_alloc,
.probe_device = msm_iommu_probe_device,
-   .release_device = msm_iommu_release_device,
.device_group = generic_device_group,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
.of_xlate = qcom_iommu_of_xlate,
diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index c54ab477b8fd..a84c63518773 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -738,8 +738,6 @@ static struct iommu_device 
*sun50i_iommu_probe_device(struct device *dev)
return >iommu;
  }
  
-static void sun50i_iommu_release_device(struct device *dev) {}

-
  static struct iommu_group *sun50i_iommu_device_group(struct device *dev)
  {
struct sun50i_iommu *iommu = sun50i_iommu_from_dev(dev);
@@ -764,7 +762,6 @@ static const struct iommu_ops sun50i_iommu_ops = {
.domain_alloc   = sun50i_iommu_domain_alloc,
.of_xlate   = sun50i_iommu_of_xlate,
.probe_device   = sun50i_iommu_probe_device,
-   .release_device = sun50i_iommu_release_device,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = sun50i_iommu_attach_device,
.detach_dev = sun50i_iommu_detach_device,
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index a6700a40a6f8..e5ca3cf1a949 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -246,10 +246,6 @@ static struct iommu_device *gart_iommu_probe_device(struct 
device *dev)
return _handle->iommu;
  }
  
-static void gart_iommu_release_device(struct device *dev)

-{
-}
-
  static int gart_iommu_of_xlate(struct device *dev,
   struct of_phandle_args *args)
  {
@@ -273,7 +269,6 @@ static void gart_iommu_sync(struct iommu_domain *domain,
  static const struct iommu_ops gart_iommu_ops = {
.domain_alloc   = gart_iommu_domain_alloc,
.probe_device   = gart_iommu_probe_device,
-   .release_device = gart_iommu_release_device,
.device_group   = generic_device_group,
.pgsize_bitmap  = GART_IOMMU_PGSIZES,
.of_xlate   = gart_iommu_of_xlate,
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 

[PATCH 2/3] iommu: Make .release_device optional

2022-06-21 Thread Robin Murphy
Many drivers do nothing meaningful for .release_device, and it's neatly
abstracted to just two callsites in the core code, so let's make it
optional to implement.

Signed-off-by: Robin Murphy 
---
 drivers/iommu/fsl_pamu_domain.c | 5 -
 drivers/iommu/iommu.c   | 6 --
 drivers/iommu/msm_iommu.c   | 5 -
 drivers/iommu/sun50i-iommu.c| 3 ---
 drivers/iommu/tegra-gart.c  | 5 -
 drivers/iommu/tegra-smmu.c  | 3 ---
 6 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 94b4589dc67c..011f9ab7f743 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -447,15 +447,10 @@ static struct iommu_device *fsl_pamu_probe_device(struct 
device *dev)
return _iommu;
 }
 
-static void fsl_pamu_release_device(struct device *dev)
-{
-}
-
 static const struct iommu_ops fsl_pamu_ops = {
.capable= fsl_pamu_capable,
.domain_alloc   = fsl_pamu_domain_alloc,
.probe_device   = fsl_pamu_probe_device,
-   .release_device = fsl_pamu_release_device,
.device_group   = fsl_pamu_device_group,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = fsl_pamu_attach_device,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 06d6989f07f6..8b4fc7e62b99 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -259,7 +259,8 @@ static int __iommu_probe_device(struct device *dev, struct 
list_head *group_list
return 0;
 
 out_release:
-   ops->release_device(dev);
+   if (ops->release_device)
+   ops->release_device(dev);
 
 out_module_put:
module_put(ops->owner);
@@ -337,7 +338,8 @@ void iommu_release_device(struct device *dev)
iommu_device_unlink(dev->iommu->iommu_dev, dev);
 
ops = dev_iommu_ops(dev);
-   ops->release_device(dev);
+   if (ops->release_device)
+   ops->release_device(dev);
 
iommu_group_remove_device(dev);
module_put(ops->owner);
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index f09aedfdd462..428919a474c1 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -394,10 +394,6 @@ static struct iommu_device *msm_iommu_probe_device(struct 
device *dev)
return >iommu;
 }
 
-static void msm_iommu_release_device(struct device *dev)
-{
-}
-
 static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device 
*dev)
 {
int ret = 0;
@@ -677,7 +673,6 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 static struct iommu_ops msm_iommu_ops = {
.domain_alloc = msm_iommu_domain_alloc,
.probe_device = msm_iommu_probe_device,
-   .release_device = msm_iommu_release_device,
.device_group = generic_device_group,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
.of_xlate = qcom_iommu_of_xlate,
diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index c54ab477b8fd..a84c63518773 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -738,8 +738,6 @@ static struct iommu_device 
*sun50i_iommu_probe_device(struct device *dev)
return >iommu;
 }
 
-static void sun50i_iommu_release_device(struct device *dev) {}
-
 static struct iommu_group *sun50i_iommu_device_group(struct device *dev)
 {
struct sun50i_iommu *iommu = sun50i_iommu_from_dev(dev);
@@ -764,7 +762,6 @@ static const struct iommu_ops sun50i_iommu_ops = {
.domain_alloc   = sun50i_iommu_domain_alloc,
.of_xlate   = sun50i_iommu_of_xlate,
.probe_device   = sun50i_iommu_probe_device,
-   .release_device = sun50i_iommu_release_device,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = sun50i_iommu_attach_device,
.detach_dev = sun50i_iommu_detach_device,
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index a6700a40a6f8..e5ca3cf1a949 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -246,10 +246,6 @@ static struct iommu_device *gart_iommu_probe_device(struct 
device *dev)
return _handle->iommu;
 }
 
-static void gart_iommu_release_device(struct device *dev)
-{
-}
-
 static int gart_iommu_of_xlate(struct device *dev,
   struct of_phandle_args *args)
 {
@@ -273,7 +269,6 @@ static void gart_iommu_sync(struct iommu_domain *domain,
 static const struct iommu_ops gart_iommu_ops = {
.domain_alloc   = gart_iommu_domain_alloc,
.probe_device   = gart_iommu_probe_device,
-   .release_device = gart_iommu_release_device,
.device_group   = generic_device_group,
.pgsize_bitmap  = GART_IOMMU_PGSIZES,
.of_xlate   = gart_iommu_of_xlate,
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 1fea68e551f1..2a8de975fe63 100644
--- a/drivers/iommu/tegra-smmu.c
+++