01 Apr, 2009
1 commit
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Change the page_mkwrite prototype to take a struct vm_fault, and return
VM_FAULT_xxx flags. There should be no functional change.This makes it possible to return much more detailed error information to
the VM (and also can provide more information eg. virtual_address to the
driver, which might be important in some special cases).This is required for a subsequent fix. And will also make it easier to
merge page_mkwrite() with fault() in future.Signed-off-by: Nick Piggin
Cc: Chris Mason
Cc: Trond Myklebust
Cc: Miklos Szeredi
Cc: Steven Whitehouse
Cc: Mark Fasheh
Cc: Joel Becker
Cc: Artem Bityutskiy
Cc: Felix Blyakher
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
22 Dec, 2008
3 commits
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Extend the deferred io code from only supporting vmalloc()ed frame
buffer memory to support both vmalloc()ed and physically contiguous
frame buffer memory.The sh_mobile_lcdcfb hardware does not support scatter gather so
we need physically contiguous memory to back our frame buffer.Signed-off-by: Magnus Damm
Acked-by: Jaya Kumar
Signed-off-by: Paul Mundt -
Make sure the mmap callback is set to NULL in the deferred io
cleanup function. This way we can enable and disable deferred
io on the fly.Signed-off-by: Magnus Damm
Acked-by: Jaya Kumar
Signed-off-by: Paul Mundt -
If CONFIG_FB_DEFERRED_IO is set, but there are framebuffers
registered that does not make use of deferred io, then fsync()
on those framebuffers will result in a crash. Fix that.This is needed for sh_mobile_lcdcfb since we always enable
deferred io at compile time but we may disable deferred io
for some types of hardware configurations.Signed-off-by: Magnus Damm
Acked-by: Jaya Kumar
Signed-off-by: Paul Mundt
21 Aug, 2008
1 commit
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Fixes kernel BUG at lib/radix-tree.c:473.
Previously the handler was incidentally provided by tmpfs but this was
removed with:commit 14fcc23fdc78e9d32372553ccf21758a9bd56fa1
Author: Hugh Dickins
Date: Mon Jul 28 15:46:19 2008 -0700tmpfs: fix kernel BUG in shmem_delete_inode
relying on this behaviour was incorrect in any case and the BUG also
appeared when the device node was on an ext3 filesystem.v2: override a_ops at open() time rather than mmap() time to minimise
races per AKPM's concerns.Signed-off-by: Ian Campbell
Cc: Jaya Kumar
Cc: Nick Piggin
Cc: Peter Zijlstra
Cc: Hugh Dickins
Cc: Johannes Weiner
Cc: Jeremy Fitzhardinge
Cc: Kel Modderman
Cc: Markus Armbruster
Cc: Krzysztof Helt
Cc: [14fcc23fd is in 2.6.25.14 and 2.6.26.1]
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Jul, 2008
1 commit
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This patch is a bugfix for how defio handles multiple processes manipulating
the same framebuffer.Thanks to Bernard Blackham for identifying this bug.
It occurs when two applications mmap the same framebuffer and concurrently
write to the same page. Normally, this doesn't occur since only a single
process mmaps the framebuffer. The symptom of the bug is that the mapping
applications will hang. The cause is that defio incorrectly tries to add the
same page twice to the pagelist. The solution I have is to walk the pagelist
and check for a duplicate before adding. Since I needed to walk the pagelist,
I now also keep the pagelist in sorted order.Signed-off-by: Jaya Kumar
Cc: Bernard Blackham
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
20 Mar, 2008
1 commit
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Implement support for the E-Ink Metronome controller. It provides an mmapable
interface to the controller using defio support. It was tested with a gumstix
pxa255 with Vizplex media using Xfbdev and various X clients such as xeyes,
xpdf, xloadimage.This patch also fixes the following bug: Defio would cause a hang on write
access to the framebuffer as the page fault would be called ad-infinitum. It
fixes fb_defio by setting the mapping to be used by page_mkclean.Signed-off-by: Jaya Kumar
Cc: "Antonino A. Daplas"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Feb, 2008
1 commit
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Convert fb defio from nopage to fault.
Switch from OOM to SIGBUS if the resource is not available.Signed-off-by: Nick Piggin
Cc: "Antonino A. Daplas"
Cc: Paul Mundt
Cc: Jaya Kumar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Oct, 2007
1 commit
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This patch replaces with after the
checkpatch.pl hint. The include of is removed if the driver
does not use it.Signed-off-by: Krzysztof Helt
Signed-off-by: Antonino Daplas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 May, 2007
4 commits
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Kill the following in fb_defio.c:
drivers/video/fb_defio.c:40:43: warning: incorrect type in argument 1 (different address spaces)
drivers/video/fb_defio.c:40:43: expected void *addr
drivers/video/fb_defio.c:40:43: got char [noderef] *screen_baseThe framebuffer memory of these types of devices are allocated from system
RAM.Signed-off-by: Antonino Daplas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are cases when we do not want to wait on the delay for automatically
updating the "real" framebuffer, this implements a simple ->fsync() hook
for explicitly flushing the deferred I/O work. The ->page_mkwrite()
handler will rearm the work queue normally.(akpm: nuke unneeded ifdefs, forward-delcare struct dentry)
Signed-off-by: Paul Mundt
Cc: Jaya Kumar
Acked-by: Antonino Daplas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Adrian Bunk
Cc: Jaya Kumar
Cc: Antonino Daplas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This implements deferred IO support in fbdev. Deferred IO is a way to delay
and repurpose IO. This implementation is done using mm's page_mkwrite and
page_mkclean hooks in order to detect, delay and then rewrite IO. This
functionality is used by hecubafb.[adaplas]
This is useful for graphics hardware with no directly addressable/mappable
framebuffer. Implementing this will allow the "framebuffer" to be accesible
from user space via mmap().Signed-off-by: Jaya Kumar
Signed-off-by: Antonino Daplas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
