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powerpc/pseries/lparcfg: add missing RTAS retry status handling 

The ibm,get-system-parameter RTAS function may return -2 or 990x,
which indicate that the caller should try again.

lparcfg's parse_system_parameter_string() ignores this, making it
possible to intermittently report incorrect SPLPAR characteristics.

Move the RTAS call into a coventional rtas_busy_delay()-based loop.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-4-26929c8cce78@linux.ibm.com
This commit is contained in:
Nathan Lynch 2023-02-10 12:41:52 -06:00 committed by Michael Ellerman
parent daa8ab5904
commit 5d08633e5f
1 changed files with 10 additions and 10 deletions
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20
arch/powerpc/platforms/pseries/lparcfg.c
View File

@ -408,6 +408,7 @@ static void read_lpar_name(struct seq_file *m)
*/
static void parse_system_parameter_string(struct seq_file *m)
{
const s32 token = rtas_token("ibm,get-system-parameter");
int call_status;
unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
@ -417,16 +418,15 @@ static void parse_system_parameter_string(struct seq_file *m)
return;
}
spin_lock(&rtas_data_buf_lock);
memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
NULL,
SPLPAR_CHARACTERISTICS_TOKEN,
__pa(rtas_data_buf),
RTAS_DATA_BUF_SIZE);
memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
spin_unlock(&rtas_data_buf_lock);
do {
spin_lock(&rtas_data_buf_lock);
memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
call_status = rtas_call(token, 3, 1, NULL, SPLPAR_CHARACTERISTICS_TOKEN,
__pa(rtas_data_buf), RTAS_DATA_BUF_SIZE);
memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
spin_unlock(&rtas_data_buf_lock);
} while (rtas_busy_delay(call_status));
if (call_status != 0) {
printk(KERN_INFO