Commit d40905fa authored by Helge Deller's avatar Helge Deller Committed by Greg Kroah-Hartman

parisc: Fix crash due alternative coding for NP iopdir_fdc bit

commit 527a1d1e upstream.

According to the found documentation, data cache flushes and sync
instructions are needed on the PCX-U+ (PA8200, e.g. C200/C240)
platforms, while PCX-W (PA8500, e.g. C360) platforms aparently don't
need those flushes when changing the IO PDIR data structures.

We have no documentation for PCX-W+ (PA8600) and PCX-W2 (PA8700) CPUs,
but Carlo Pisani reported that his C3600 machine (PA8600, PCX-W+) fails
when the fdc instructions were removed. His firmware didn't set the NIOP
bit, so one may assume it's a firmware bug since other C3750 machines
had the bit set.

Even if documentation (as mentioned above) states that PCX-W (PA8500,
e.g.  J5000) does not need fdc flushes, Sven could show that an Adaptec
29320A PCI-X SCSI controller reliably failed on a dd command during the
first five minutes in his J5000 when fdc flushes were missing.

Going forward, we will now NOT replace the fdc and sync assembler
instructions by NOPS if:
a) the NP iopdir_fdc bit was set by firmware, or
b) we find a CPU up to and including a PCX-W+ (PA8600).

This fixes the HPMC crashes on a C240 and C36XX machines. For other
machines we rely on the firmware to set the bit when needed.

In case one finds HPMC issues, people could try to boot their machines
with the "no-alternatives" kernel option to turn off any alternative
patching.
Reported-by: default avatarSven Schnelle <svens@stackframe.org>
Reported-by: default avatarCarlo Pisani <carlojpisani@gmail.com>
Tested-by: default avatarSven Schnelle <svens@stackframe.org>
Fixes: 3847dab7 ("parisc: Add alternative coding infrastructure")
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # 5.0+
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5ca4fb12
......@@ -56,7 +56,8 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
* time IO-PDIR is changed in Ike/Astro.
*/
if ((cond & ALT_COND_NO_IOC_FDC) &&
(boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC))
((boot_cpu_data.cpu_type <= pcxw_) ||
(boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)))
continue;
/* Want to replace pdtlb by a pdtlb,l instruction? */
......
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