Hi Laurent,
> On Tuesday 30 September 2014 16:16:07 Suman Anna wrote:
>> The debugfs support for OMAP IOMMU is currently implemented
>> as a module, warranting certain OMAP-specific IOMMU API to
>> be exported. The OMAP IOMMU, when enabled, can only be built-in
>> into the kernel, so integrate the OMAP IOMMU debug module
>> into the OMAP IOMMU driver. This helps in eliminating the
>> need to export most of the current OMAP IOMMU API.
>>
>> The following are the main changes:
>> - The OMAP_IOMMU_DEBUG Kconfig option is eliminated, and
>> the OMAP IOMMU debugfs support is built alongside the OMAP
>> IOMMU driver, and enabled automatically only when debugfs
>> is enabled.
>
> That's the part I'm unsure about. We're loosing the ability to save space by
> not building the omap-iommu debugfs support when debugfs is enabled.
Yeah, I thought about it a bit, and went in favor of eliminating the
Kconfig. I don't have a strong opinion on this, but if saving space is
what is preferred, I can easily rework this patch to add it back.
Joerg, any preference which way we should go here?
>
> For the rest of the series,
>
> Acked-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Thank you for reviewing the patches.
regards
Suman
>
>> - The debugfs directory and entry creation logic is reversed,
>> the calls are invoked by the OMAP IOMMU driver now.
>> - The current iffy circular logic of adding IOMMU archdata
>> to the IOMMU devices itself to get a pointer to the omap_iommu
>> object in the debugfs support code is replaced by directly
>> using the omap_iommu structure while creating the debugfs
>> entries.
>> - The debugfs root directory is renamed from the generic name
>> "iommu" to a specific name "omap_iommu".
>> - Unneeded headers have also been cleaned up while at this.
>> - There will no longer be a omap-iommu-debug.ko module after
>> this patch.
>>
>> Signed-off-by: Suman Anna <s-a...@ti.com>
>> ---
>> drivers/iommu/Kconfig | 9 ----
>> drivers/iommu/Makefile | 3 +-
>> drivers/iommu/omap-iommu-debug.c | 102
>> ++++++++++++--------------------------- drivers/iommu/omap-iommu.c |
>> 11 +++--
>> drivers/iommu/omap-iommu.h | 7 +++
>> 5 files changed, 45 insertions(+), 87 deletions(-)
>>
>> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
>> index dd51122..9724d4a 100644
>> --- a/drivers/iommu/Kconfig
>> +++ b/drivers/iommu/Kconfig
>> @@ -143,15 +143,6 @@ config OMAP_IOMMU
>> depends on ARCH_OMAP2PLUS
>> select IOMMU_API
>>
>> -config OMAP_IOMMU_DEBUG
>> - tristate "Export OMAP IOMMU internals in DebugFS"
>> - depends on OMAP_IOMMU && DEBUG_FS
>> - help
>> - Select this to see extensive information about
>> - the internal state of OMAP IOMMU in debugfs.
>> -
>> - Say N unless you know you need this.
>> -
>> config TEGRA_IOMMU_GART
>> bool "Tegra GART IOMMU Support"
>> depends on ARCH_TEGRA_2x_SOC
>> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
>> index 18fa446..e0a4fed 100644
>> --- a/drivers/iommu/Makefile
>> +++ b/drivers/iommu/Makefile
>> @@ -10,8 +10,7 @@ obj-$(CONFIG_DMAR_TABLE) += dmar.o
>> obj-$(CONFIG_INTEL_IOMMU) += iova.o intel-iommu.o
>> obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
>> obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
>> -obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
>> -obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
>> +obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o omap-iommu-debug.o
>> obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
>> obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
>> obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
>> diff --git a/drivers/iommu/omap-iommu-debug.c
>> b/drivers/iommu/omap-iommu-debug.c index 28de657..54a0dc6 100644
>> --- a/drivers/iommu/omap-iommu-debug.c
>> +++ b/drivers/iommu/omap-iommu-debug.c
>> @@ -10,15 +10,11 @@
>> * published by the Free Software Foundation.
>> */
>>
>> -#include <linux/module.h>
>> #include <linux/err.h>
>> -#include <linux/clk.h>
>> #include <linux/io.h>
>> #include <linux/slab.h>
>> #include <linux/uaccess.h>
>> -#include <linux/platform_device.h>
>> #include <linux/debugfs.h>
>> -#include <linux/omap-iommu.h>
>> #include <linux/platform_data/iommu-omap.h>
>>
>> #include "omap-iopgtable.h"
>> @@ -31,8 +27,7 @@ static struct dentry *iommu_debug_root;
>> static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
>> size_t count, loff_t *ppos)
>> {
>> - struct device *dev = file->private_data;
>> - struct omap_iommu *obj = dev_to_omap_iommu(dev);
>> + struct omap_iommu *obj = file->private_data;
>> char *p, *buf;
>> ssize_t bytes;
>>
>> @@ -55,8 +50,7 @@ static ssize_t debug_read_regs(struct file *file, char
>> __user *userbuf, static ssize_t debug_read_tlb(struct file *file, char
>> __user *userbuf, size_t count, loff_t *ppos)
>> {
>> - struct device *dev = file->private_data;
>> - struct omap_iommu *obj = dev_to_omap_iommu(dev);
>> + struct omap_iommu *obj = file->private_data;
>> char *p, *buf;
>> ssize_t bytes, rest;
>>
>> @@ -141,8 +135,7 @@ out:
>> static ssize_t debug_read_pagetable(struct file *file, char __user
>> *userbuf, size_t count, loff_t *ppos)
>> {
>> - struct device *dev = file->private_data;
>> - struct omap_iommu *obj = dev_to_omap_iommu(dev);
>> + struct omap_iommu *obj = file->private_data;
>> char *p, *buf;
>> size_t bytes;
>>
>> @@ -181,93 +174,58 @@ DEBUG_FOPS_RO(pagetable);
>> #define __DEBUG_ADD_FILE(attr, mode)
>> \
>> { \
>> struct dentry *dent; \
>> - dent = debugfs_create_file(#attr, mode, parent, \
>> - dev, &debug_##attr##_fops); \
>> + dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
>> + obj, &debug_##attr##_fops); \
>> if (!dent) \
>> - return -ENOMEM; \
>> + goto err; \
>> }
>>
>> #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
>>
>> -static int iommu_debug_register(struct device *dev, void *data)
>> +void omap_iommu_debugfs_add(struct omap_iommu *obj)
>> {
>> - struct platform_device *pdev = to_platform_device(dev);
>> - struct omap_iommu *obj = platform_get_drvdata(pdev);
>> - struct omap_iommu_arch_data *arch_data;
>> - struct dentry *d, *parent;
>> -
>> - if (!obj || !obj->dev)
>> - return -EINVAL;
>> -
>> - arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL);
>> - if (!arch_data)
>> - return -ENOMEM;
>> -
>> - arch_data->iommu_dev = obj;
>> + struct dentry *d;
>>
>> - dev->archdata.iommu = arch_data;
>> + if (!iommu_debug_root)
>> + return;
>>
>> - d = debugfs_create_dir(obj->name, iommu_debug_root);
>> - if (!d)
>> - goto nomem;
>> - parent = d;
>> + obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
>> + if (!obj->debug_dir)
>> + return;
>>
>> - d = debugfs_create_u8("nr_tlb_entries", 0400, parent,
>> + d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir,
>> (u8 *)&obj->nr_tlb_entries);
>> if (!d)
>> - goto nomem;
>> + return;
>>
>> DEBUG_ADD_FILE_RO(regs);
>> DEBUG_ADD_FILE_RO(tlb);
>> DEBUG_ADD_FILE_RO(pagetable);
>>
>> - return 0;
>> + return;
>>
>> -nomem:
>> - kfree(arch_data);
>> - return -ENOMEM;
>> +err:
>> + debugfs_remove_recursive(obj->debug_dir);
>> }
>>
>> -static int iommu_debug_unregister(struct device *dev, void *data)
>> +void omap_iommu_debugfs_remove(struct omap_iommu *obj)
>> {
>> - if (!dev->archdata.iommu)
>> - return 0;
>> -
>> - kfree(dev->archdata.iommu);
>> -
>> - dev->archdata.iommu = NULL;
>> + if (!obj->debug_dir)
>> + return;
>>
>> - return 0;
>> + debugfs_remove_recursive(obj->debug_dir);
>> }
>>
>> -static int __init iommu_debug_init(void)
>> +void __init omap_iommu_debugfs_init(void)
>> {
>> - struct dentry *d;
>> - int err;
>> -
>> - d = debugfs_create_dir("iommu", NULL);
>> - if (!d)
>> - return -ENOMEM;
>> - iommu_debug_root = d;
>> -
>> - err = omap_foreach_iommu_device(d, iommu_debug_register);
>> - if (err)
>> - goto err_out;
>> - return 0;
>> -
>> -err_out:
>> - debugfs_remove_recursive(iommu_debug_root);
>> - return err;
>> + if (debugfs_initialized()) {
>> + iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
>> + if (!iommu_debug_root)
>> + pr_err("can't create debugfs dir\n");
>> + }
>> }
>> -module_init(iommu_debug_init)
>>
>> -static void __exit iommu_debugfs_exit(void)
>> +void __exit omap_iommu_debugfs_exit(void)
>> {
>> - debugfs_remove_recursive(iommu_debug_root);
>> - omap_foreach_iommu_device(NULL, iommu_debug_unregister);
>> + debugfs_remove(iommu_debug_root);
>> }
>> -module_exit(iommu_debugfs_exit)
>> -
>> -MODULE_DESCRIPTION("omap iommu: debugfs interface");
>> -MODULE_AUTHOR("Hiroshi DOYU <hiroshi.d...@nokia.com>");
>> -MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
>> index 9ace5557..717d654 100644
>> --- a/drivers/iommu/omap-iommu.c
>> +++ b/drivers/iommu/omap-iommu.c
>> @@ -472,8 +472,6 @@ static void flush_iotlb_all(struct omap_iommu *obj)
>> pm_runtime_put_sync(obj->dev);
>> }
>>
>> -#if defined(CONFIG_OMAP_IOMMU_DEBUG) ||
>> defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE) -
>> #define pr_reg(name)
>> \
>> do { \
>> ssize_t bytes; \
>> @@ -602,8 +600,6 @@ int omap_foreach_iommu_device(void *data, int
>> (*fn)(struct device *, void *)) }
>> EXPORT_SYMBOL_GPL(omap_foreach_iommu_device);
>>
>> -#endif /* CONFIG_OMAP_IOMMU_DEBUG_MODULE */
>> -
>> /*
>> * H/W pagetable operations
>> */
>> @@ -1077,6 +1073,8 @@ static int omap_iommu_probe(struct platform_device
>> *pdev) pm_runtime_irq_safe(obj->dev);
>> pm_runtime_enable(obj->dev);
>>
>> + omap_iommu_debugfs_add(obj);
>> +
>> dev_info(&pdev->dev, "%s registered\n", obj->name);
>> return 0;
>> }
>> @@ -1086,6 +1084,7 @@ static int omap_iommu_remove(struct platform_device
>> *pdev) struct omap_iommu *obj = platform_get_drvdata(pdev);
>>
>> iopgtable_clear_entry_all(obj);
>> + omap_iommu_debugfs_remove(obj);
>>
>> pm_runtime_disable(obj->dev);
>>
>> @@ -1403,6 +1402,8 @@ static int __init omap_iommu_init(void)
>>
>> bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
>>
>> + omap_iommu_debugfs_init();
>> +
>> return platform_driver_register(&omap_iommu_driver);
>> }
>> /* must be ready before omap3isp is probed */
>> @@ -1413,6 +1414,8 @@ static void __exit omap_iommu_exit(void)
>> kmem_cache_destroy(iopte_cachep);
>>
>> platform_driver_unregister(&omap_iommu_driver);
>> +
>> + omap_iommu_debugfs_exit();
>> }
>> module_exit(omap_iommu_exit);
>>
>> diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
>> index 0516e0e..6e9a8d2 100644
>> --- a/drivers/iommu/omap-iommu.h
>> +++ b/drivers/iommu/omap-iommu.h
>> @@ -30,6 +30,7 @@ struct omap_iommu {
>> void __iomem *regbase;
>> struct device *dev;
>> struct iommu_domain *domain;
>> + struct dentry *debug_dir;
>>
>> spinlock_t iommu_lock; /* global for this whole object */
>>
>> @@ -202,6 +203,12 @@ omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
>> ssize_t len); extern size_t
>> omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
>>
>> +void omap_iommu_debugfs_init(void);
>> +void omap_iommu_debugfs_exit(void);
>> +
>> +void omap_iommu_debugfs_add(struct omap_iommu *obj);
>> +void omap_iommu_debugfs_remove(struct omap_iommu *obj);
>> +
>> /*
>> * register accessors
>> */
>
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