Convert the existing GPU show function to use the GPU state to
dump the information rather than reading it directly from the hardware.
This will require an additional step to capture the state before
dumping it for the existing nodes but it will greatly facilitate reusing
the same code for dumping
Add the infrastructure to capture the current state of the GPU and
store it in memory so that it can be dumped later.
For now grab the same basic ringbuffer information and registers
that are provided by the debugfs 'gpu' node but obviously this should
be extended to capture a much larger set of
Add a put function for the coredump printer to bypass printf()
for constant strings for a speed boost.
Signed-off-by: Jordan Crouse
---
drivers/gpu/drm/drm_print.c | 42 +
include/drm/drm_print.h | 2 ++
2 files changed, 44 insertions(+)
diff --git
Do a bit of cleanup to prepare for upcoming changes to pass the
hanging task comm and cmdline to the crash dump function.
Signed-off-by: Jordan Crouse
---
drivers/gpu/drm/msm/msm_gpu.c | 18 ++
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git
Add a drm printer suitable for use with the read callback for
devcoredump or other suitable buffer based output format that
isn't otherwise covered by seq_file.
Signed-off-by: Jordan Crouse
---
drivers/gpu/drm/drm_print.c | 74 +
include/drm/drm_print.h |
Add drm_puts() for a much faster path to print constant strings
into a drm_printer object with memcpy and friends. This can
shave seconds off of really large outputs such as GPU dumps.
If the drm_printer object supports a custom puts function then
use that otherwise fall back to the slower legacy
The i915 DRM driver very cleverly used ascii85 encoding for their
GPU state file. Move the encode functions to a general header file to
support other drivers that might be interested in the same
functionality.
v3: Fix error_puts -> err_puts pointed out by the 01.org bot
v2: Update API to be
Add support for drm_puts() to use seq_puts() to help speed up
up print time for constant strings.
Signed-off-by: Jordan Crouse
---
drivers/gpu/drm/drm_print.c | 6 ++
include/drm/drm_print.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/drm_print.c
HLSQ, SP and TP registers are only accessible from a special
aperture and to make matters worse the aperture is blocked from
the CPU on targets that can support secure rendering. Luckily the
GPU hardware has its own purpose built register dumper that can
access the registers from the aperture. Add
Capture the GPU state on a GPU hang and store it for later playback
via the devcoredump facility. Only one crash state is stored at a
time on the assumption that the first hang is usually the most
interesting. The existing crash state can be cleared after capturing
it and then a new one will be
For hangs, dump copy out the contents of the buffer objects attached to the
guilty submission and print them in the crash dump report.
Signed-off-by: Jordan Crouse
---
Documentation/gpu/drm-msm-crash-dump.txt | 7 +++
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 58
Add the contents of each ringbuffer to the GPU state and dump the
data in the crash file encoded with ascii85. To save space only
the used portions of the ringbuffer are dumped.
Signed-off-by: Jordan Crouse
---
Documentation/gpu/drm-msm-crash-dump.txt | 5 +++
Convert the format of the 'show' debugfs file and the crash
dump to a format resembling YAML. This should be easier to
parse and be more flexible for future changes and expansions.
Signed-off-by: Jordan Crouse
---
Documentation/gpu/drm-msm-crash-dump.txt | 46
On Fri, Jun 29, 2018 at 8:48 PM, Kees Cook wrote:
> In the quest to remove all stack VLA usage from the kernel[1], this
> switches to using a kasprintf()ed buffer. Return paths are updated
> to free the allocation.
>
> [1]
>
In the quest to remove all stack VLA usage from the kernel[1], this
switches to using a kasprintf()ed buffer. Return paths are updated
to free the allocation.
[1]
https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qpxydaacu1rq...@mail.gmail.com
Signed-off-by: Kees Cook
---
Hi Jordan,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on robclark/msm-next]
[also build test WARNING on v4.18-rc2 next-20180629]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com
Hi Jordan,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on robclark/msm-next]
[also build test ERROR on v4.18-rc2 next-20180629]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0day-ci
On Fri, Jun 29, 2018 at 10:47:31PM +0200, Arnd Bergmann wrote:
> On Fri, Jun 29, 2018 at 8:48 PM, Kees Cook wrote:
> > In the quest to remove all stack VLA usage from the kernel[1], this
> > switches to using a kasprintf()ed buffer. Return paths are updated
> > to free the allocation.
> >
> > [1]
On Fri, Jun 29, 2018 at 11:48:18AM -0700, Kees Cook wrote:
> In the quest to remove all stack VLA usage from the kernel[1], this
> switches to using a kasprintf()ed buffer. Return paths are updated
> to free the allocation.
>
> [1]
>
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