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authorMing Lei <tom.leiming@gmail.com>2008-09-18 17:06:21 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 23:40:57 +0200
commit3c04e20ea95f9a8555456000e0ff340bdc46dea8 (patch)
tree6159c4095f2ede77a560b04e886814f0d40ba141
parentusb: gadget: workaround storage command size issues (diff)
downloadlinux-3c04e20ea95f9a8555456000e0ff340bdc46dea8.tar.xz
linux-3c04e20ea95f9a8555456000e0ff340bdc46dea8.zip
USB: ehci-dbg: increase debug buffer size for periodic file
This patch is based on the following ideas: 1. Some usb devices (such as usb video class) have endpoints of high interval attribute, so reading "periodic" file need more debug buffer to accommodate the qh or itd schedule information. For example, 4KB buffer is not enough for a single interrupt qh of 2ms period. 2. print a %p need 16 byte buffer on 64-bits arch, but 8 byte on 32-bits arch. Add a extra bonus for 64-bits arch. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/host/ehci-dbg.c44
-rw-r--r--drivers/usb/host/ehci-hcd.c1
2 files changed, 26 insertions, 19 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index b0f8ed5a7fb9..9534ff3f5e7b 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -358,7 +358,8 @@ struct debug_buffer {
struct usb_bus *bus;
struct mutex mutex; /* protect filling of buffer */
size_t count; /* number of characters filled into buffer */
- char *page;
+ char *output_buf;
+ size_t alloc_size;
};
#define speed_char(info1) ({ char tmp; \
@@ -488,8 +489,8 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf->page;
- size = PAGE_SIZE;
+ next = buf->output_buf;
+ size = buf->alloc_size;
*next = 0;
@@ -510,7 +511,7 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
}
spin_unlock_irqrestore (&ehci->lock, flags);
- return strlen(buf->page);
+ return strlen(buf->output_buf);
}
#define DBG_SCHED_LIMIT 64
@@ -531,8 +532,8 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf->page;
- size = PAGE_SIZE;
+ next = buf->output_buf;
+ size = buf->alloc_size;
temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
size -= temp;
@@ -649,7 +650,7 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
spin_unlock_irqrestore (&ehci->lock, flags);
kfree (seen);
- return PAGE_SIZE - size;
+ return buf->alloc_size - size;
}
#undef DBG_SCHED_LIMIT
@@ -665,8 +666,8 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf->page;
- size = PAGE_SIZE;
+ next = buf->output_buf;
+ size = buf->alloc_size;
spin_lock_irqsave (&ehci->lock, flags);
@@ -808,7 +809,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
done:
spin_unlock_irqrestore (&ehci->lock, flags);
- return PAGE_SIZE - size;
+ return buf->alloc_size - size;
}
static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
@@ -822,6 +823,7 @@ static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
buf->bus = bus;
buf->fill_func = fill_func;
mutex_init(&buf->mutex);
+ buf->alloc_size = PAGE_SIZE;
}
return buf;
@@ -831,10 +833,10 @@ static int fill_buffer(struct debug_buffer *buf)
{
int ret = 0;
- if (!buf->page)
- buf->page = (char *)get_zeroed_page(GFP_KERNEL);
+ if (!buf->output_buf)
+ buf->output_buf = (char *)vmalloc(buf->alloc_size);
- if (!buf->page) {
+ if (!buf->output_buf) {
ret = -ENOMEM;
goto out;
}
@@ -867,7 +869,7 @@ static ssize_t debug_output(struct file *file, char __user *user_buf,
mutex_unlock(&buf->mutex);
ret = simple_read_from_buffer(user_buf, len, offset,
- buf->page, buf->count);
+ buf->output_buf, buf->count);
out:
return ret;
@@ -879,8 +881,8 @@ static int debug_close(struct inode *inode, struct file *file)
struct debug_buffer *buf = file->private_data;
if (buf) {
- if (buf->page)
- free_page((unsigned long)buf->page);
+ if (buf->output_buf)
+ vfree(buf->output_buf);
kfree(buf);
}
@@ -895,10 +897,14 @@ static int debug_async_open(struct inode *inode, struct file *file)
static int debug_periodic_open(struct inode *inode, struct file *file)
{
- file->private_data = alloc_buffer(inode->i_private,
- fill_periodic_buffer);
+ struct debug_buffer *buf;
+ buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
+ if (!buf)
+ return -ENOMEM;
- return file->private_data ? 0 : -ENOMEM;
+ buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
+ file->private_data = buf;
+ return 0;
}
static int debug_registers_open(struct inode *inode, struct file *file)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8409e0705d63..7378aa137a4a 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -24,6 +24,7 @@
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>