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iommu/omap: fix erroneous omap-iommu-debug API calls

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Adapt omap-iommu-debug to the latest omap-iommu API changes, which
were introduced by commit fabdbca "iommu/omap: eliminate the public
omap_find_iommu_device() method".

In a nutshell, iommu users are not expected to provide the omap_iommu
handle anymore - instead, iommus are attached using their user's device
handle.

omap-iommu-debug is a hybrid beast though: it invokes both public and
private omap iommu API, so fix it as necessary (otherwise a crash
is imminent).

Note: omap-iommu-debug is a bit disturbing, as it fiddles with internal
omap iommu data and requires exposing API which is otherwise not needed.
It should better be more tightly coupled with omap-iommu, to prevent
further bit rot and avoid exposing redundant API. Naturally that's out
of scope for the -rc cycle, so for now just fix the obvious.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Hiroshi Doyu <hdoyu@nvidia.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Joerg Roedel <Joerg.Roedel@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Ohad Ben-Cohen 2012-02-22 10:52:51 +02:00 committed by Joerg Roedel
parent 05df1f3c2a
commit 46451d6229
1 changed files with 43 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
drivers/iommu/omap-iommu-debug.c
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@ -44,7 +44,8 @@ static ssize_t debug_read_ver(struct file *file, char __user *userbuf,
static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
ssize_t bytes;
@ -67,7 +68,8 @@ 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 omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
ssize_t bytes, rest;
@ -97,7 +99,8 @@ static ssize_t debug_write_pagetable(struct file *file,
struct iotlb_entry e;
struct cr_regs cr;
int err;
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char buf[MAXCOLUMN], *p = buf;
count = min(count, sizeof(buf));
@ -184,7 +187,8 @@ static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len)
static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
size_t bytes;
@ -212,7 +216,8 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
struct iovm_struct *tmp;
int uninitialized_var(i);
@ -254,7 +259,7 @@ static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
char *p, *buf;
struct iovm_struct *area;
ssize_t bytes;
@ -268,7 +273,7 @@ static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
mutex_lock(&iommu_debug_lock);
area = omap_find_iovm_area(obj, (u32)ppos);
area = omap_find_iovm_area(dev, (u32)ppos);
if (IS_ERR(area)) {
bytes = -EINVAL;
goto err_out;
@ -287,7 +292,7 @@ static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
struct device *dev = file->private_data;
struct iovm_struct *area;
char *p, *buf;
@ -305,7 +310,7 @@ static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
goto err_out;
}
area = omap_find_iovm_area(obj, (u32)ppos);
area = omap_find_iovm_area(dev, (u32)ppos);
if (IS_ERR(area)) {
count = -EINVAL;
goto err_out;
@ -350,7 +355,7 @@ DEBUG_FOPS(mem);
{ \
struct dentry *dent; \
dent = debugfs_create_file(#attr, mode, parent, \
obj, &debug_##attr##_fops); \
dev, &debug_##attr##_fops); \
if (!dent) \
return -ENOMEM; \
}
@ -362,20 +367,29 @@ static int iommu_debug_register(struct device *dev, void *data)
{
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;
dev->archdata.iommu = arch_data;
d = debugfs_create_dir(obj->name, iommu_debug_root);
if (!d)
return -ENOMEM;
goto nomem;
parent = d;
d = debugfs_create_u8("nr_tlb_entries", 400, parent,
(u8 *)&obj->nr_tlb_entries);
if (!d)
return -ENOMEM;
goto nomem;
DEBUG_ADD_FILE_RO(ver);
DEBUG_ADD_FILE_RO(regs);
@ -384,6 +398,22 @@ static int iommu_debug_register(struct device *dev, void *data)
DEBUG_ADD_FILE_RO(mmap);
DEBUG_ADD_FILE(mem);
return 0;
nomem:
kfree(arch_data);
return -ENOMEM;
}
static int iommu_debug_unregister(struct device *dev, void *data)
{
if (!dev->archdata.iommu)
return 0;
kfree(dev->archdata.iommu);
dev->archdata.iommu = NULL;
return 0;
}
@ -411,6 +441,7 @@ module_init(iommu_debug_init)
static void __exit iommu_debugfs_exit(void)
{
debugfs_remove_recursive(iommu_debug_root);
omap_foreach_iommu_device(NULL, iommu_debug_unregister);
}
module_exit(iommu_debugfs_exit)