From ed8b67040965e4fe695db333d5914e18ea5f146f Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 16 Dec 2009 22:17:09 +0000 Subject: drm: convert drm_ioctl to unlocked_ioctl drm_ioctl is called with the Big Kernel Lock held, which shows up very high in statistics on vfs_ioctl. Moving the lock into the drm_ioctl function itself makes sure we blame the right subsystem and it gets us one step closer to eliminating the locked version of fops->ioctl. Since drm_ioctl does not require the lock itself, we only need to hold it while calling the specific handler. The 32 bit conversion handlers do not interact with any other code, so they don't need the BKL here either and can just call drm_ioctl. As a bonus, this cleans up all the other users of drm_ioctl which now no longer have to find the inode or call lock_kernel. [airlied: squashed the non-driver bits of the second patch in here, this provides the flag for drivers to use to select unlocked ioctls - but doesn't modify any drivers]. Signed-off-by: Arnd Bergmann Cc: David Airlie Cc: dri-devel@lists.sourceforge.net Cc: Frederic Weisbecker Cc: Thomas Gleixner Signed-off-by: Dave Airlie --- drivers/gpu/drm/i915/i915_ioc32.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'drivers/gpu/drm/i915/i915_ioc32.c') diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c index 1fe68a251b75..13b028994b2b 100644 --- a/drivers/gpu/drm/i915/i915_ioc32.c +++ b/drivers/gpu/drm/i915/i915_ioc32.c @@ -66,8 +66,7 @@ static int compat_i915_batchbuffer(struct file *file, unsigned int cmd, &batchbuffer->cliprects)) return -EFAULT; - return drm_ioctl(file->f_path.dentry->d_inode, file, - DRM_IOCTL_I915_BATCHBUFFER, + return drm_ioctl(file, DRM_IOCTL_I915_BATCHBUFFER, (unsigned long)batchbuffer); } @@ -102,8 +101,8 @@ static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd, &cmdbuffer->cliprects)) return -EFAULT; - return drm_ioctl(file->f_path.dentry->d_inode, file, - DRM_IOCTL_I915_CMDBUFFER, (unsigned long)cmdbuffer); + return drm_ioctl(file, DRM_IOCTL_I915_CMDBUFFER, + (unsigned long)cmdbuffer); } typedef struct drm_i915_irq_emit32 { @@ -125,8 +124,8 @@ static int compat_i915_irq_emit(struct file *file, unsigned int cmd, &request->irq_seq)) return -EFAULT; - return drm_ioctl(file->f_path.dentry->d_inode, file, - DRM_IOCTL_I915_IRQ_EMIT, (unsigned long)request); + return drm_ioctl(file, DRM_IOCTL_I915_IRQ_EMIT, + (unsigned long)request); } typedef struct drm_i915_getparam32 { int param; @@ -149,8 +148,8 @@ static int compat_i915_getparam(struct file *file, unsigned int cmd, &request->value)) return -EFAULT; - return drm_ioctl(file->f_path.dentry->d_inode, file, - DRM_IOCTL_I915_GETPARAM, (unsigned long)request); + return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM, + (unsigned long)request); } typedef struct drm_i915_mem_alloc32 { @@ -178,8 +177,8 @@ static int compat_i915_alloc(struct file *file, unsigned int cmd, &request->region_offset)) return -EFAULT; - return drm_ioctl(file->f_path.dentry->d_inode, file, - DRM_IOCTL_I915_ALLOC, (unsigned long)request); + return drm_ioctl(file, DRM_IOCTL_I915_ALLOC, + (unsigned long)request); } drm_ioctl_compat_t *i915_compat_ioctls[] = { @@ -211,12 +210,10 @@ long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(i915_compat_ioctls)) fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE]; - lock_kernel(); /* XXX for now */ if (fn != NULL) ret = (*fn) (filp, cmd, arg); else - ret = drm_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg); - unlock_kernel(); + ret = drm_ioctl(filp, cmd, arg); return ret; } -- cgit v1.2.1