[PATCH 1/2] drm/i915: Remove unused compat32 code

[PATCH 1/2] drm/i915: Remove unused compat32 code

[Daniel Vetter]

Totatlly forgotten that we have these when nuking all the UMS code.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/i915/i915_ioc32.c | 125 --------------------------------------
 1 file changed, 125 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c
index 176de6322e4d..6eec2221b44e 100644
--- a/drivers/gpu/drm/i915/i915_ioc32.c
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -35,98 +35,6 @@
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 
-typedef struct _drm_i915_batchbuffer32 {
-	int start;		/* agp offset */
-	int used;		/* nr bytes in use */
-	int DR1;		/* hw flags for GFX_OP_DRAWRECT_INFO */
-	int DR4;		/* window origin for GFX_OP_DRAWRECT_INFO */
-	int num_cliprects;	/* mulitpass with multiple cliprects? */
-	u32 cliprects;		/* pointer to userspace cliprects */
-} drm_i915_batchbuffer32_t;
-
-static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
-				   unsigned long arg)
-{
-	drm_i915_batchbuffer32_t batchbuffer32;
-	drm_i915_batchbuffer_t __user *batchbuffer;
-
-	if (copy_from_user
-	    (&batchbuffer32, (void __user *)arg, sizeof(batchbuffer32)))
-		return -EFAULT;
-
-	batchbuffer = compat_alloc_user_space(sizeof(*batchbuffer));
-	if (!access_ok(VERIFY_WRITE, batchbuffer, sizeof(*batchbuffer))
-	    || __put_user(batchbuffer32.start, &batchbuffer->start)
-	    || __put_user(batchbuffer32.used, &batchbuffer->used)
-	    || __put_user(batchbuffer32.DR1, &batchbuffer->DR1)
-	    || __put_user(batchbuffer32.DR4, &batchbuffer->DR4)
-	    || __put_user(batchbuffer32.num_cliprects,
-			  &batchbuffer->num_cliprects)
-	    || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
-			  &batchbuffer->cliprects))
-		return -EFAULT;
-
-	return drm_ioctl(file, DRM_IOCTL_I915_BATCHBUFFER,
-			 (unsigned long)batchbuffer);
-}
-
-typedef struct _drm_i915_cmdbuffer32 {
-	u32 buf;		/* pointer to userspace command buffer */
-	int sz;			/* nr bytes in buf */
-	int DR1;		/* hw flags for GFX_OP_DRAWRECT_INFO */
-	int DR4;		/* window origin for GFX_OP_DRAWRECT_INFO */
-	int num_cliprects;	/* mulitpass with multiple cliprects? */
-	u32 cliprects;		/* pointer to userspace cliprects */
-} drm_i915_cmdbuffer32_t;
-
-static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
-				 unsigned long arg)
-{
-	drm_i915_cmdbuffer32_t cmdbuffer32;
-	drm_i915_cmdbuffer_t __user *cmdbuffer;
-
-	if (copy_from_user
-	    (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
-		return -EFAULT;
-
-	cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
-	if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
-	    || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
-			  &cmdbuffer->buf)
-	    || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
-	    || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
-	    || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
-	    || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
-	    || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
-			  &cmdbuffer->cliprects))
-		return -EFAULT;
-
-	return drm_ioctl(file, DRM_IOCTL_I915_CMDBUFFER,
-			 (unsigned long)cmdbuffer);
-}
-
-typedef struct drm_i915_irq_emit32 {
-	u32 irq_seq;
-} drm_i915_irq_emit32_t;
-
-static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
-				unsigned long arg)
-{
-	drm_i915_irq_emit32_t req32;
-	drm_i915_irq_emit_t __user *request;
-
-	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
-		return -EFAULT;
-
-	request = compat_alloc_user_space(sizeof(*request));
-	if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
-	    || __put_user((int __user *)(unsigned long)req32.irq_seq,
-			  &request->irq_seq))
-		return -EFAULT;
-
-	return drm_ioctl(file, DRM_IOCTL_I915_IRQ_EMIT,
-			 (unsigned long)request);
-}
 typedef struct drm_i915_getparam32 {
 	int param;
 	u32 value;
@@ -152,41 +60,8 @@ static int compat_i915_getparam(struct file *file, unsigned int cmd,
 			 (unsigned long)request);
 }
 
-typedef struct drm_i915_mem_alloc32 {
-	int region;
-	int alignment;
-	int size;
-	u32 region_offset;	/* offset from start of fb or agp */
-} drm_i915_mem_alloc32_t;
-
-static int compat_i915_alloc(struct file *file, unsigned int cmd,
-			     unsigned long arg)
-{
-	drm_i915_mem_alloc32_t req32;
-	drm_i915_mem_alloc_t __user *request;
-
-	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
-		return -EFAULT;
-
-	request = compat_alloc_user_space(sizeof(*request));
-	if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
-	    || __put_user(req32.region, &request->region)
-	    || __put_user(req32.alignment, &request->alignment)
-	    || __put_user(req32.size, &request->size)
-	    || __put_user((void __user *)(unsigned long)req32.region_offset,
-			  &request->region_offset))
-		return -EFAULT;
-
-	return drm_ioctl(file, DRM_IOCTL_I915_ALLOC,
-			 (unsigned long)request);
-}
-
 static drm_ioctl_compat_t *i915_compat_ioctls[] = {
-	[DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
-	[DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
 	[DRM_I915_GETPARAM] = compat_i915_getparam,
-	[DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
-	[DRM_I915_ALLOC] = compat_i915_alloc
 };
 
 /**
-- 
2.1.4

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[PATCH 2/2] drm/i915: Use expcitly fixed type in compat32 structs

[Daniel Vetter]

I was confused shortly whether the compat was needed for the int,
until I noticed the pointer in the original.

Also remove typedef.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/i915/i915_ioc32.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c
index 6eec2221b44e..ff5dc1d0d864 100644
--- a/drivers/gpu/drm/i915/i915_ioc32.c
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -35,15 +35,15 @@
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 
-typedef struct drm_i915_getparam32 {
-	int param;
+struct drm_i915_getparam32 {
+	s32 param;
 	u32 value;
-} drm_i915_getparam32_t;
+};
 
 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 				unsigned long arg)
 {
-	drm_i915_getparam32_t req32;
+	struct drm_i915_getparam32 req32;
 	drm_i915_getparam_t __user *request;
 
 	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
-- 
2.1.4

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Re: [PATCH 1/2] drm/i915: Remove unused compat32 code

[Chris Wilson]

On Tue, Jul 14, 2015 at 10:59:30AM +0200, Daniel Vetter wrote:
> Totatlly forgotten that we have these when nuking all the UMS code.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

All deleted UMS stubs,
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
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Re: [PATCH 2/2] drm/i915: Use expcitly fixed type in compat32 structs

[Chris Wilson]

On Tue, Jul 14, 2015 at 10:59:31AM +0200, Daniel Vetter wrote:
> I was confused shortly whether the compat was needed for the int,
> until I noticed the pointer in the original.
> 
> Also remove typedef.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Oh, why an int? But you should improve the uapi definition as well. And
add a (short) paragraph before it to explain exactly why we should never
ever do this again.
-Chris

-- 
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Re: [PATCH 1/2] drm/i915: Remove unused compat32 code

[Daniel Vetter]

On Tue, Jul 14, 2015 at 10:15:21AM +0100, Chris Wilson wrote:
> On Tue, Jul 14, 2015 at 10:59:30AM +0200, Daniel Vetter wrote:
> > Totatlly forgotten that we have these when nuking all the UMS code.
> > 
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> 
> All deleted UMS stubs,
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Applied to dinq, thanks for the review.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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[PATCH] drm/i915: Use expcitly fixed type in compat32 structs

[Daniel Vetter]

I was confused shortly whether the compat was needed for the int,
until I noticed the pointer in the original.

Also remove typedef.

v2: Review from Chris.
- Add comments.
- Also change the int param in the original structure.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/i915/i915_ioc32.c | 13 +++++++++----
 include/uapi/drm/i915_drm.h       |  6 +++++-
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c
index 6eec2221b44e..a5a2d5b3f44b 100644
--- a/drivers/gpu/drm/i915/i915_ioc32.c
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -35,15 +35,20 @@
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 
-typedef struct drm_i915_getparam32 {
-	int param;
+struct drm_i915_getparam32 {
+	s32 param;
+	/*
+	 * We screwed up the generic ioctl struct here and used a variable-sized
+	 * pointer. Use u32 in the compat struct to match the 32bit pointer
+	 * userspace expects.
+	 */
 	u32 value;
-} drm_i915_getparam32_t;
+};
 
 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 				unsigned long arg)
 {
-	drm_i915_getparam32_t req32;
+	struct drm_i915_getparam32 req32;
 	drm_i915_getparam_t __user *request;
 
 	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index e7c29f1659ad..192027b4f031 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -358,7 +358,11 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_RESOURCE_STREAMER 36
 
 typedef struct drm_i915_getparam {
-	int param;
+	s32 param;
+	/*
+	 * WARNING: Using pointers instead of fixed-size u64 means we need to write
+	 * compat32 code. Don't repeat this mistake.
+	 */
 	int __user *value;
 } drm_i915_getparam_t;
 
-- 
2.1.4

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Re: [PATCH] drm/i915: Use expcitly fixed type in compat32 structs

[Chris Wilson]

On Tue, Jul 14, 2015 at 06:07:30PM +0200, Daniel Vetter wrote:
> I was confused shortly whether the compat was needed for the int,
> until I noticed the pointer in the original.
> 
> Also remove typedef.
> 
> v2: Review from Chris.
> - Add comments.
> - Also change the int param in the original structure.
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

I think there is much more value in documenting every mistake we make in
the uabi than there is the fixes themselves, so the comments are much
appreciated.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
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