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SubjectRe: [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
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On 4/4/2018 1:55 PM, Gary R Hook wrote:
> Implement a skeleton framework for debugfs support in the
> AMD IOMMU.
>
>
> Signed-off-by: Gary R Hook <gary.hook@amd.com>
> ---
> drivers/iommu/Makefile | 1 +
> drivers/iommu/amd_iommu_debugfs.c | 45 +++++++++++++++++++++++++++++++++++++
> drivers/iommu/amd_iommu_init.c | 7 ++++--
> drivers/iommu/amd_iommu_proto.h | 8 ++++++-
> drivers/iommu/amd_iommu_types.h | 3 ++
> 5 files changed, 61 insertions(+), 3 deletions(-)
> create mode 100644 drivers/iommu/amd_iommu_debugfs.c
>
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index 5eb1121d54b9..0ca250f626d9 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
> obj-$(CONFIG_OF_IOMMU) += of_iommu.o
> obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
> obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
> +obj-$(CONFIG_IOMMU_DEBUG) += amd_iommu_debugfs.o
> obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
> obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
> obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
> diff --git a/drivers/iommu/amd_iommu_debugfs.c b/drivers/iommu/amd_iommu_debugfs.c
> new file mode 100644
> index 000000000000..282100a655b3
> --- /dev/null
> +++ b/drivers/iommu/amd_iommu_debugfs.c
> @@ -0,0 +1,45 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * AMD IOMMU driver
> + *
> + * Copyright (C) 2018 Advanced Micro Devices, Inc.
> + *
> + * Author: Gary R Hook <gary.hook@amd.com>
> + */
> +
> +#include <linux/debugfs.h>
> +#include <linux/iommu.h>
> +#include <linux/pci.h>
> +#include "amd_iommu_proto.h"
> +#include "amd_iommu_types.h"
> +
> +static struct dentry *amd_iommu_debugfs;
> +static DEFINE_MUTEX(amd_iommu_debugfs_lock);
> +
> +#define MAX_NAME_LEN 20
> +
> +void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
> +{
> + char name[MAX_NAME_LEN + 1];
> + struct dentry *d_top;
> +
> + if (!debugfs_initialized())
> + return;
> +
> + mutex_lock(&amd_iommu_debugfs_lock);
> + if (!amd_iommu_debugfs) {
> + d_top = iommu_debugfs_setup();
> + if (d_top)
> + amd_iommu_debugfs = debugfs_create_dir("amd", d_top);
> + }
> + mutex_unlock(&amd_iommu_debugfs_lock);
> + if (amd_iommu_debugfs) {
> + snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
> + iommu->debugfs = debugfs_create_dir(name,
> + amd_iommu_debugfs);
> + if (!iommu->debugfs) {
> + debugfs_remove_recursive(amd_iommu_debugfs);
> + amd_iommu_debugfs = NULL;
> + }
> + }
> +}
> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
> index 6fe2d0346073..43856c7f4ea1 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -89,6 +89,7 @@
> #define ACPI_DEVFLAG_ATSDIS 0x10000000
>
> #define LOOP_TIMEOUT 100000
> +

Spurious new line.

> /*
> * ACPI table definitions
> *
> @@ -2720,6 +2721,7 @@ int __init amd_iommu_enable_faulting(void)
> */
> static int __init amd_iommu_init(void)
> {
> + struct amd_iommu *iommu;
> int ret;
>
> ret = iommu_go_to_state(IOMMU_INITIALIZED);
> @@ -2729,14 +2731,15 @@ static int __init amd_iommu_init(void)
> disable_iommus();
> free_iommu_resources();
> } else {
> - struct amd_iommu *iommu;
> -
> uninit_device_table_dma();
> for_each_iommu(iommu)
> iommu_flush_all_caches(iommu);
> }
> }
>
> + for_each_iommu(iommu)
> + amd_iommu_debugfs_setup(iommu);
> +
> return ret;
> }
>
> diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
> index 640c286a0ab9..1cfaae28c2cd 100644
> --- a/drivers/iommu/amd_iommu_proto.h
> +++ b/drivers/iommu/amd_iommu_proto.h
> @@ -33,6 +33,12 @@ extern void amd_iommu_uninit_devices(void);
> extern void amd_iommu_init_notifier(void);
> extern int amd_iommu_init_api(void);
>
> +#ifdef CONFIG_IOMMU_DEBUG
> +void amd_iommu_debugfs_setup(struct amd_iommu *iommu);
> +#else
> +static inline void amd_iommu_debugfs_setup(struct amd_iommu *iommu) {}
> +#endif
> +
> /* Needed for interrupt remapping */
> extern int amd_iommu_prepare(void);
> extern int amd_iommu_enable(void);
> @@ -58,7 +64,7 @@ extern int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid);
> extern struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev);
>
> #ifdef CONFIG_IRQ_REMAP
> -extern int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
> +int amd_iommu_create_irq_domain(struct amd_iommu *iommu);

I don't think this change is required for the debugfs support.

Thanks,
Tom

> #else
> static inline int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
> {
> diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
> index f6b24c7d8b70..43c52797810e 100644
> --- a/drivers/iommu/amd_iommu_types.h
> +++ b/drivers/iommu/amd_iommu_types.h
> @@ -591,6 +591,9 @@ struct amd_iommu {
>
> u32 flags;
> volatile u64 __aligned(8) cmd_sem;
> +
> + /* DebugFS Info */
> + struct dentry *debugfs;
> };
>
> static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
>

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