linux-toradex.git/drivers/hwtracing/intel_th/gth.c, branch v5.11

intel_th: gth: Fix the window switching sequence

2019-11-04T14:01:22+00:00

Commit 8116db57cf16 ("intel_th: Add switch triggering support") added
a trigger assertion of the CTS, but forgot to de-assert it at the end
of the sequence. This results in window switches randomly not happening.

Fix that by de-asserting the trigger at the end of the window switch
sequence.

Signed-off-by: Alexander Shishkin 
Reviewed-by: Andy Shevchenko 
Fixes: 8116db57cf16 ("intel_th: Add switch triggering support")
Cc: stable 
Link: https://lore.kernel.org/r/20191028070651.9770-2-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman

intel_th: Add switch triggering support

2019-05-03T16:16:21+00:00

Add support for asserting window switch trigger when tracing to MSU output
ports. This allows for software controlled switching between windows of
the MSU buffer, which can be used for double buffering while exporting the
trace data further from the MSU.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: gth: Factor out trace start/stop

2019-05-03T16:16:21+00:00

The trace enable/disable functions of the GTH include the code that starts
and stops trace flom from the sources. This start/stop functionality will
also be used in the window switch trigger sequence.

Factor out start/stop code from the larger trace enable/disable code in
preparation for the window switch sequence.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Factor out pipeline draining

2019-05-03T16:16:21+00:00

The code that waits for the pipeline empty condition of the MSU is
currently called in the path that disables the trace. We will also
need this in the window switch trigger sequence. Therefore, factor
out this code and make it accessible to the GTH device.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: gth: Fix an off-by-one in output unassigning

2019-03-01T08:20:38+00:00

Commit 9ed3f22223c3 ("intel_th: Don't reference unassigned outputs")
fixes a NULL dereference for all masters except the last one ("256+"),
which keeps the stale pointer after the output driver had been unassigned.

Fix the off-by-one.

Signed-off-by: Alexander Shishkin 
Fixes: 9ed3f22223c3 ("intel_th: Don't reference unassigned outputs")
Signed-off-by: Greg Kroah-Hartman

intel_th: Don't reference unassigned outputs

2019-02-21T15:43:14+00:00

When an output port driver is removed, also remove references to it from
any masters. Failing to do this causes a NULL ptr dereference when
configuring another output port:

> BUG: unable to handle kernel NULL pointer dereference at 000000000000000d
> RIP: 0010:master_attr_store+0x9d/0x160 [intel_th_gth]
> Call Trace:
> dev_attr_store+0x1b/0x30
> sysfs_kf_write+0x3c/0x50
> kernfs_fop_write+0x125/0x1a0
> __vfs_write+0x3a/0x190
> ? __vfs_write+0x5/0x190
> ? _cond_resched+0x1a/0x50
> ? rcu_all_qs+0x5/0xb0
> ? __vfs_write+0x5/0x190
> vfs_write+0xb8/0x1b0
> ksys_write+0x55/0xc0
> __x64_sys_write+0x1a/0x20
> do_syscall_64+0x5a/0x140
> entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Alexander Shishkin 
Fixes: b27a6a3f97b9 ("intel_th: Add Global Trace Hub driver")
CC: stable@vger.kernel.org # v4.4+
Reported-by: Ammy Yi

intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate

2018-03-28T15:47:19+00:00

This adds SPDX GPL-2.0 header to the Trace Hub driver and removes the
GPLv2 boilerplate text.

Signed-off-by: Alexander Shishkin

intel_th: Perform time resync on capture start

2017-08-25T15:48:00+00:00

On some devices (TH 2.x devices at the moment), the internal time counter
is initially not synchronized to the global crystal clock, so the time
stamps it produces will not be useful. In this case, the driver needs
to force the time counter resync.

This applies the workaround to relevant devices.

Signed-off-by: Alexander Shishkin

intel_th: Make the switch allocate its subdevices

2017-08-25T15:47:55+00:00

Instead of allocating devices for every possible output subdevice,
allow the switch to allocate only the ones that it knows about.

Signed-off-by: Alexander Shishkin

intel_th: gth: Handle host mode correctly

2016-11-18T15:11:35+00:00

When detecting host debugger mode either though a module option or via
the scratchpad register, do not export any configuration or capture
related attributes to userspace and refuse attempts by the output drivers
to configure output ports.

This way, GTH can still act as a hub and ensure that the other components
that rely on its presence continue to function properly, namely the
source devices.

Signed-off-by: Alexander Shishkin