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powerpc/powernv: implement opal_put_chars_atomic

Telusuri Sumber 
The RAW console does not need writes to be atomic, so relax
opal_put_chars to be able to do partial writes, and implement an
_atomic variant which does not take a spinlock. This API is used
in xmon, so the less locking that is used, the better chance there
is that a crash can be debugged.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2018-05-01 00:55:51 +10:00
committed by Michael Ellerman
orang tua ac4ac788fd
melakukan 17cc1dd492
3 mengubah file dengan 41 tambahan dan 15 penghapusan
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18
drivers/tty/hvc/hvc_opal.c
Melihat File

@@ -183,9 +183,15 @@ static int hvc_opal_probe(struct platform_device *dev)
return -ENOMEM;
pv->proto = proto;
hvc_opal_privs[termno] = pv;
if (proto == HV_PROTOCOL_HVSI)
hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
if (proto == HV_PROTOCOL_HVSI) {
/*
* We want put_chars to be atomic to avoid mangling of
* hvsi packets.
*/
hvsilib_init(&pv->hvsi,
opal_get_chars, opal_put_chars_atomic,
termno, 0);
}
/* Instanciate now to establish a mapping index==vtermno */
hvc_instantiate(termno, termno, ops);
@@ -375,8 +381,9 @@ void __init hvc_opal_init_early(void)
else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
ops = &hvc_opal_hvsi_ops;
hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
opal_put_chars, index, 1);
hvsilib_init(&hvc_opal_boot_priv.hvsi,
opal_get_chars, opal_put_chars_atomic,
index, 1);
/* HVSI, perform the handshake now */
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
pr_devel("hvc_opal: Found HVSI console\n");
@@ -408,7 +415,8 @@ void __init udbg_init_debug_opal_hvsi(void)
hvc_opal_privs[index] = &hvc_opal_boot_priv;
hvc_opal_boot_termno = index;
udbg_init_opal_common();
hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
hvsilib_init(&hvc_opal_boot_priv.hvsi,
opal_get_chars, opal_put_chars_atomic,
index, 1);
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
}