Hi Andy,

On 7/30/21 12:35 AM, Andy Shevchenko wrote:
Compiler is not happy about hidden declaration of intel_iommu_ops.

.../drivers/iommu/intel/iommu.c:414:24: warning: symbol 'intel_iommu_ops' was 
not declared. Should it be static?

Move declaration to header file to make compiler happy.

Thanks for the cleanup. Sharing data structures between different files
doesn't seem to be a good design. How about adding a helper so that the
intel_iommu_ops could be a static one?

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 05a65eb155f7..2258e69a93a3 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -757,6 +757,7 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev);
 struct dmar_domain *find_domain(struct device *dev);
 struct device_domain_info *get_domain_info(struct device *dev);
struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn);
+int intel_iommu_register_device(struct intel_iommu *iommu);

 #ifdef CONFIG_INTEL_IOMMU_SVM
 extern void intel_svm_check(struct intel_iommu *iommu);
@@ -805,7 +806,6 @@ void intel_iommu_debugfs_init(void);
 static inline void intel_iommu_debugfs_init(void) {}
 #endif /* CONFIG_INTEL_IOMMU_DEBUGFS */

-extern const struct attribute_group *intel_iommu_groups[];
 bool context_present(struct context_entry *context);
struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
                                         u8 devfn, int alloc);
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 0ec5514c9980..deef4e77de73 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -66,8 +66,6 @@ static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)];
 static int alloc_iommu(struct dmar_drhd_unit *drhd);
 static void free_iommu(struct intel_iommu *iommu);

-extern const struct iommu_ops intel_iommu_ops;
-
 static void dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
 {
        /*
@@ -1133,15 +1131,9 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
         * present at boot time, then sets intel_iommu_enabled.
         */
        if (intel_iommu_enabled && !drhd->ignored) {
-               err = iommu_device_sysfs_add(&iommu->iommu, NULL,
-                                            intel_iommu_groups,
-                                            "%s", iommu->name);
+               err = intel_iommu_register_device(iommu);
                if (err)
                        goto err_unmap;
-
- err = iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL);
-               if (err)
-                       goto err_sysfs;
        }

        drhd->iommu = iommu;
@@ -1149,8 +1141,6 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)

        return 0;

-err_sysfs:
-       iommu_device_sysfs_remove(&iommu->iommu);
 err_unmap:
        unmap_iommu(iommu);
 error_free_seq_id:
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 6df5fc5063e1..27ba3062bcac 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -388,7 +388,7 @@ int for_each_device_domain(int (*fn)(struct device_domain_info *info,
        return 0;
 }

-const struct iommu_ops intel_iommu_ops;
+static const struct iommu_ops intel_iommu_ops;

 static bool translation_pre_enabled(struct intel_iommu *iommu)
 {
@@ -4221,7 +4221,7 @@ static struct attribute_group intel_iommu_group = {
        .attrs = intel_iommu_attrs,
 };

-const struct attribute_group *intel_iommu_groups[] = {
+static const struct attribute_group *intel_iommu_groups[] = {
        &intel_iommu_group,
        NULL,
 };
@@ -4301,6 +4301,23 @@ static int __init probe_acpi_namespace_devices(void)
        return 0;
 }

+int intel_iommu_register_device(struct intel_iommu *iommu)
+{
+       int ret;
+
+       ret = iommu_device_sysfs_add(&iommu->iommu, NULL,
+                                    intel_iommu_groups,
+                                    "%s", iommu->name);
+       if (ret)
+               return ret;
+
+       ret = iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL);
+       if (ret)
+               iommu_device_sysfs_remove(&iommu->iommu);
+
+       return ret;
+}
+
 int __init intel_iommu_init(void)
 {
        int ret = -ENODEV;
@@ -4407,10 +4424,7 @@ int __init intel_iommu_init(void)
pr_info_once("IOMMU batching disallowed due to virtualization\n");
                        iommu_set_dma_strict();
                }
-               iommu_device_sysfs_add(&iommu->iommu, NULL,
-                                      intel_iommu_groups,
-                                      "%s", iommu->name);
- iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL);
+               intel_iommu_register_device(iommu);
        }
        up_read(&dmar_global_lock);

@@ -5589,7 +5603,7 @@ static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
        }
 }

-const struct iommu_ops intel_iommu_ops = {
+static const struct iommu_ops intel_iommu_ops = {
        .capable                = intel_iommu_capable,
        .domain_alloc           = intel_iommu_domain_alloc,
        .domain_free            = intel_iommu_domain_free,

Best regards,
baolu


Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
  drivers/iommu/intel/dmar.c  | 2 --
  include/linux/intel-iommu.h | 2 ++
  2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index d66f79acd14d..d2d974cf8322 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -66,8 +66,6 @@ static unsigned long 
dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)];
  static int alloc_iommu(struct dmar_drhd_unit *drhd);
  static void free_iommu(struct intel_iommu *iommu);
-extern const struct iommu_ops intel_iommu_ops;
-
  static void dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
  {
        /*
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index d0fa0b31994d..309c1e13183a 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -811,6 +811,8 @@ struct context_entry *iommu_context_addr(struct intel_iommu 
*iommu, u8 bus,
                                         u8 devfn, int alloc);
#ifdef CONFIG_INTEL_IOMMU
+extern const struct iommu_ops intel_iommu_ops;
+
  extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  extern int dmar_disabled;

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