diff mbox

[v4] x86: sysfb: remove sysfb when probing real hw

Message ID 1387473881-26179-1-git-send-email-dh.herrmann@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

David Herrmann Dec. 19, 2013, 5:24 p.m. UTC 
With CONFIG_X86_SYSFB=y, probing real hw-drivers may result in
resource-conflicts and drivers will refuse to load. A call to
request_mem_region() will fail, if the region overlaps with the mem-region
used by simplefb. The common desktop DRM drivers (intel, nouveau, radeon)
are not affected as they don't reserve their resources, but some others
do, including (nvidiafb, cirrus, ..).

The problem is that we add an IORESOURCE_MEM to the simple-framebuffer
platform-device during bootup but never release it. Probing simplefb on
this platform-device is fine, but the handover to real-hw via
remove_conflicting_framebuffers() will only unload the fbdev driver, but
keep the platform-device around. Thus, if the real hw-driver calls
request_mem_region() and friends on the same PCI region, we will get a
resource conflict and most drivers refuse to load. Users will see
errors like:
  "nvidiafb: cannot reserve video memory at <xyz>"

vesafb and efifb don't store any resources, so disabling CONFIG_X86_SYSFB
and falling back to those drivers will avoid the bug. With sysfb enabled,
we need to properly unload the simple-framebuffer devices before probing
real hw-drivers.

This patch adds sysfb_unregister() for that purpose. It can be called from
any context (except from the platform-device ->probe and ->remove callback
path), synchronously unloads any global sysfb and prevents new sysfbs from
getting registered. Thus, you can call it even before any sysfb has been
loaded. Note that for now we only do that for simple-framebuffer devices,
as efi/vesa-framebuffer platform-drivers lack ->remove() callbacks.
They're not affected by the resource-conflicts, so we can fix those later.

This also changes remove_conflicting_framebuffer() to call this helper
*before* trying its heuristic to remove conflicting drivers. This way, we
unload sysfbs properly on any conflict. But to avoid dead-locks in
register_framebuffer(), we must not call sysfb_unregister() for
framebuffers probing on sysfb devices. Hence, we simply remove any
aperture from simplefb and we're good to go. simplefb is unregistered by
sysfb_unregister() now, so no reason to keep the apertures (on non-x86,
there currently is no handover from simplefb, so we're fine. If it's
added, they need to provide something like sysfb_unregister() too)

Cc: <stable@vger.kernel.org> # v3.11+
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Takashi Iwai <tiwai@suse.de>
---
v4:
 - change #ifdef to CONFIG_X86_SYSFB again

 arch/x86/include/asm/sysfb.h     |  6 ++++
 arch/x86/kernel/sysfb.c          | 68 ++++++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/sysfb_simplefb.c |  9 ++----
 drivers/video/fbmem.c            | 19 +++++++++++
 drivers/video/simplefb.c         |  8 -----
 5 files changed, 95 insertions(+), 15 deletions(-)

Comments

Ingo Molnar Dec. 19, 2013, 6:33 p.m. UTC | #1 
* David Herrmann <dh.herrmann@gmail.com> wrote:

> +/*
> + * Unregister the sysfb and prevent new sysfbs from getting registered. Can be
> + * called from any context except recursively or from sysfb_register().
> + * Used by remove_conflicting_framebuffers() and friends.
> + */
> +void sysfb_unregister(const struct apertures_struct *apert, bool primary)
> +{
> +	mutex_lock(&sysfb_lock);
> +	if (!IS_ERR(sysfb_dev) && sysfb_dev) {
> +		if (sysfb_match(apert, primary)) {
> +			platform_device_unregister(sysfb_dev);
> +			sysfb_dev = ERR_PTR(-EALREADY);
> +		}
> +	} else {
> +		/* if !sysfb_dev, set err so no new sysfb is probed later */
> +		sysfb_dev = ERR_PTR(-EALREADY);

Just a small detail: we can get into this 'else' branch not just with 
NULL, but also with IS_ERR(sysfb_dev). In that case we override 
whatever error code is contained in sysfb_dev and overwrite it with 
ERR_PTR(-EALREADY).

(Probably not a big deal, because we don't actually ever seem to 
extract the error code from the pointer, but wanted to mention it.)

> +#ifdef CONFIG_X86_SYSFB
> +#include <asm/sysfb.h>
> +#endif

Pet peeve, this looks sexier:

#ifdef CONFIG_X86_SYSFB
# include <asm/sysfb.h>
#endif

> @@ -1604,6 +1607,17 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
>  	}
>  }
>  
> +static void remove_conflicting_sysfb(const struct apertures_struct *apert,
> +				     bool primary)
> +{
> +	if (!apert)
> +		return;
> +
> +#ifdef CONFIG_X86_SYSFB
> +	sysfb_unregister(apert, primary);
> +#endif
> +}

So why not make sysfb_unregister() accept a !apert parameter (it would 
simply return), at which point remove_conflicting_sysfb() could be 
eliminated and just be replaced with a direct sysfb_unregister() call 
- with no #ifdefs.

We only need #ifdefs for the sysfb_unregister() declaration in the .h 
file.

At first sight this looks simpler and cleaner for the fix itself - no 
need for extra cleanups for this detail.

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
David Herrmann Dec. 20, 2013, 2:46 p.m. UTC | #2 
Hi

On Thu, Dec 19, 2013 at 7:33 PM, Ingo Molnar <mingo@kernel.org> wrote:
>
> * David Herrmann <dh.herrmann@gmail.com> wrote:
>
>> +/*
>> + * Unregister the sysfb and prevent new sysfbs from getting registered. Can be
>> + * called from any context except recursively or from sysfb_register().
>> + * Used by remove_conflicting_framebuffers() and friends.
>> + */
>> +void sysfb_unregister(const struct apertures_struct *apert, bool primary)
>> +{
>> +     mutex_lock(&sysfb_lock);
>> +     if (!IS_ERR(sysfb_dev) && sysfb_dev) {
>> +             if (sysfb_match(apert, primary)) {
>> +                     platform_device_unregister(sysfb_dev);
>> +                     sysfb_dev = ERR_PTR(-EALREADY);
>> +             }
>> +     } else {
>> +             /* if !sysfb_dev, set err so no new sysfb is probed later */
>> +             sysfb_dev = ERR_PTR(-EALREADY);
>
> Just a small detail: we can get into this 'else' branch not just with
> NULL, but also with IS_ERR(sysfb_dev). In that case we override
> whatever error code is contained in sysfb_dev and overwrite it with
> ERR_PTR(-EALREADY).
>
> (Probably not a big deal, because we don't actually ever seem to
> extract the error code from the pointer, but wanted to mention it.)

Yepp, I know, but that's just fine.

>> +#ifdef CONFIG_X86_SYSFB
>> +#include <asm/sysfb.h>
>> +#endif
>
> Pet peeve, this looks sexier:
>
> #ifdef CONFIG_X86_SYSFB
> # include <asm/sysfb.h>
> #endif
>
>> @@ -1604,6 +1607,17 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
>>       }
>>  }
>>
>> +static void remove_conflicting_sysfb(const struct apertures_struct *apert,
>> +                                  bool primary)
>> +{
>> +     if (!apert)
>> +             return;
>> +
>> +#ifdef CONFIG_X86_SYSFB
>> +     sysfb_unregister(apert, primary);
>> +#endif
>> +}
>
> So why not make sysfb_unregister() accept a !apert parameter (it would
> simply return), at which point remove_conflicting_sysfb() could be
> eliminated and just be replaced with a direct sysfb_unregister() call
> - with no #ifdefs.
>
> We only need #ifdefs for the sysfb_unregister() declaration in the .h
> file.

I can do that but we still need the #ifdef. sysfb is an x86-asm header
so it's not available on other archs. Even with #ifdef in the header I
still need it around the actual function call.

Thanks
David

> At first sight this looks simpler and cleaner for the fix itself - no
> need for extra cleanups for this detail.
>
> Thanks,
>
>         Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/arch/x86/include/asm/sysfb.h b/arch/x86/include/asm/sysfb.h
index 2aeb3e2..0877cf1 100644
--- a/arch/x86/include/asm/sysfb.h
+++ b/arch/x86/include/asm/sysfb.h
@@ -11,6 +11,7 @@ 
  * any later version.
  */
 
+#include <linux/fb.h>
 #include <linux/kernel.h>
 #include <linux/platform_data/simplefb.h>
 #include <linux/screen_info.h>
@@ -59,6 +60,11 @@  struct efifb_dmi_info {
 	int flags;
 };
 
+int __init sysfb_register(const char *name, int id,
+			  const struct resource *res, unsigned int res_num,
+			  const void *data, size_t data_size);
+void sysfb_unregister(const struct apertures_struct *apert, bool primary);
+
 #ifdef CONFIG_EFI
 
 extern struct efifb_dmi_info efifb_dmi_list[];
diff --git a/arch/x86/kernel/sysfb.c b/arch/x86/kernel/sysfb.c
index 193ec2c..882dc7c 100644
--- a/arch/x86/kernel/sysfb.c
+++ b/arch/x86/kernel/sysfb.c
@@ -33,11 +33,79 @@ 
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/mutex.h>
 #include <linux/platform_data/simplefb.h>
 #include <linux/platform_device.h>
 #include <linux/screen_info.h>
 #include <asm/sysfb.h>
 
+static DEFINE_MUTEX(sysfb_lock);
+static struct platform_device *sysfb_dev;
+
+int __init sysfb_register(const char *name, int id,
+			  const struct resource *res, unsigned int res_num,
+			  const void *data, size_t data_size)
+{
+	struct platform_device *pd;
+	int ret = 0;
+
+	mutex_lock(&sysfb_lock);
+	if (!sysfb_dev) {
+		pd = platform_device_register_resndata(NULL, name, id,
+						       res, res_num,
+						       data, data_size);
+		if (IS_ERR(pd))
+			ret = PTR_ERR(pd);
+		else
+			sysfb_dev = pd;
+	}
+	mutex_unlock(&sysfb_lock);
+
+	return ret;
+}
+
+static bool sysfb_match(const struct apertures_struct *apert, bool primary)
+{
+	struct screen_info *si = &screen_info;
+	unsigned int i;
+	const struct aperture *a;
+
+	if (!apert || primary)
+		return true;
+
+	for (i = 0; i < apert->count; ++i) {
+		a = &apert->ranges[i];
+		if (a->base >= si->lfb_base &&
+		    a->base < si->lfb_base + ((u64)si->lfb_size << 16))
+			return true;
+		if (si->lfb_base >= a->base &&
+		    si->lfb_base < a->base + a->size)
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * Unregister the sysfb and prevent new sysfbs from getting registered. Can be
+ * called from any context except recursively or from sysfb_register().
+ * Used by remove_conflicting_framebuffers() and friends.
+ */
+void sysfb_unregister(const struct apertures_struct *apert, bool primary)
+{
+	mutex_lock(&sysfb_lock);
+	if (!IS_ERR(sysfb_dev) && sysfb_dev) {
+		if (sysfb_match(apert, primary)) {
+			platform_device_unregister(sysfb_dev);
+			sysfb_dev = ERR_PTR(-EALREADY);
+		}
+	} else {
+		/* if !sysfb_dev, set err so no new sysfb is probed later */
+		sysfb_dev = ERR_PTR(-EALREADY);
+	}
+	mutex_unlock(&sysfb_lock);
+}
+
 static __init int sysfb_init(void)
 {
 	struct screen_info *si = &screen_info;
diff --git a/arch/x86/kernel/sysfb_simplefb.c b/arch/x86/kernel/sysfb_simplefb.c
index 86179d4..a760d47 100644
--- a/arch/x86/kernel/sysfb_simplefb.c
+++ b/arch/x86/kernel/sysfb_simplefb.c
@@ -64,7 +64,6 @@  __init bool parse_mode(const struct screen_info *si,
 __init int create_simplefb(const struct screen_info *si,
 			   const struct simplefb_platform_data *mode)
 {
-	struct platform_device *pd;
 	struct resource res;
 	unsigned long len;
 
@@ -86,10 +85,6 @@  __init int create_simplefb(const struct screen_info *si,
 	if (res.end <= res.start)
 		return -EINVAL;
 
-	pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0,
-					       &res, 1, mode, sizeof(*mode));
-	if (IS_ERR(pd))
-		return PTR_ERR(pd);
-
-	return 0;
+	return sysfb_register("simple-framebuffer", 0, &res, 1, mode,
+			      sizeof(*mode));
 }
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 010d191..7dc0491 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -35,6 +35,9 @@ 
 
 #include <asm/fb.h>
 
+#ifdef CONFIG_X86_SYSFB
+#include <asm/sysfb.h>
+#endif
 
     /*
      *  Frame buffer device initialization and setup routines
@@ -1604,6 +1607,17 @@  static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
 	}
 }
 
+static void remove_conflicting_sysfb(const struct apertures_struct *apert,
+				     bool primary)
+{
+	if (!apert)
+		return;
+
+#ifdef CONFIG_X86_SYSFB
+	sysfb_unregister(apert, primary);
+#endif
+}
+
 static int do_register_framebuffer(struct fb_info *fb_info)
 {
 	int i;
@@ -1742,6 +1756,8 @@  EXPORT_SYMBOL(unlink_framebuffer);
 void remove_conflicting_framebuffers(struct apertures_struct *a,
 				     const char *name, bool primary)
 {
+	remove_conflicting_sysfb(a, primary);
+
 	mutex_lock(&registration_lock);
 	do_remove_conflicting_framebuffers(a, name, primary);
 	mutex_unlock(&registration_lock);
@@ -1762,6 +1778,9 @@  register_framebuffer(struct fb_info *fb_info)
 {
 	int ret;
 
+	remove_conflicting_sysfb(fb_info->apertures,
+				 fb_is_primary_device(fb_info));
+
 	mutex_lock(&registration_lock);
 	ret = do_register_framebuffer(fb_info);
 	mutex_unlock(&registration_lock);
diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c
index 210f3a0..9f4a0cf 100644
--- a/drivers/video/simplefb.c
+++ b/drivers/video/simplefb.c
@@ -209,14 +209,6 @@  static int simplefb_probe(struct platform_device *pdev)
 	info->var.blue = params.format->blue;
 	info->var.transp = params.format->transp;
 
-	info->apertures = alloc_apertures(1);
-	if (!info->apertures) {
-		framebuffer_release(info);
-		return -ENOMEM;
-	}
-	info->apertures->ranges[0].base = info->fix.smem_start;
-	info->apertures->ranges[0].size = info->fix.smem_len;
-
 	info->fbops = &simplefb_ops;
 	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE;
 	info->screen_base = ioremap_wc(info->fix.smem_start,