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powerpc/pseries: convert CMO probe to papr_sysparm API

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Convert the direct invocation of the ibm,get-system-parameter RTAS
function to papr_sysparm_get().

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-15-26929c8cce78@linux.ibm.com
This commit is contained in:
Nathan Lynch 2023-02-10 12:42:03 -06:00 committed by Michael Ellerman
parent 419e27f32b
commit b8dc71774a
1 changed files with 6 additions and 17 deletions
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23
arch/powerpc/platforms/pseries/setup.c
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@ -57,6 +57,7 @@
#include <asm/pmc.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/papr-sysparm.h>
#include <asm/ppc-pci.h>
#include <asm/i8259.h>
#include <asm/udbg.h>
@ -941,32 +942,21 @@ void pSeries_coalesce_init(void)
*/
static void __init pSeries_cmo_feature_init(void)
{
const s32 token = rtas_token("ibm,get-system-parameter");
static struct papr_sysparm_buf buf __initdata;
static_assert(sizeof(buf.val) >= CMO_MAXLENGTH);
char *ptr, *key, *value, *end;
int call_status;
int page_order = IOMMU_PAGE_SHIFT_4K;
pr_debug(" -> fw_cmo_feature_init()\n");
do {
spin_lock(&rtas_data_buf_lock);
call_status = rtas_call(token, 3, 1, NULL,
CMO_CHARACTERISTICS_TOKEN,
__pa(rtas_data_buf),
RTAS_DATA_BUF_SIZE);
if (call_status == 0)
break;
spin_unlock(&rtas_data_buf_lock);
} while (rtas_busy_delay(call_status));
if (call_status != 0) {
if (papr_sysparm_get(PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS, &buf)) {
pr_debug("CMO not available\n");
pr_debug(" <- fw_cmo_feature_init()\n");
return;
}
end = rtas_data_buf + CMO_MAXLENGTH - 2;
ptr = rtas_data_buf + 2; /* step over strlen value */
end = &buf.val[CMO_MAXLENGTH];
ptr = &buf.val[0];
key = value = ptr;
while (*ptr && (ptr <= end)) {
@ -1012,7 +1002,6 @@ static void __init pSeries_cmo_feature_init(void)
} else
pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
CMO_SecPSP);
spin_unlock(&rtas_data_buf_lock);
pr_debug(" <- fw_cmo_feature_init()\n");
}