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Date: Fri, 30 Jul 2021 10:20:08 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Joerg Roedel <jroedel@...e.de>,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v1 1/2] iommu/vt-d: Move intel_iommu_ops to header file
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.shevchenko@...ux.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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