From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
mikey@neuling.org, hbabu@us.ibm.com, linuxppc-dev@ozlabs.org,
<linux-kernel@vger.kernel.org>
Subject: [PATCH 09/10] powerpc/vas: Create cpu to vas id mapping
Date: Sat, 16 Sep 2017 21:05:27 -0700 [thread overview]
Message-ID: <1505621128-23877-10-git-send-email-sukadev@linux.vnet.ibm.com> (raw)
In-Reply-To: <1505621128-23877-1-git-send-email-sukadev@linux.vnet.ibm.com>
Create a cpu to vasid mapping so callers can specify -1 instead of
trying to find a VAS id.
Changelog[v2]
[Michael Ellerman] Use per-cpu variables to simplify code.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/vas.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
index 565a487..abb7090 100644
--- a/arch/powerpc/platforms/powernv/vas.c
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -18,15 +18,18 @@
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of.h>
+#include <asm/prom.h>
#include "vas.h"
static DEFINE_MUTEX(vas_mutex);
static LIST_HEAD(vas_instances);
+static DEFINE_PER_CPU(int, cpu_vas_id);
+
static int init_vas_instance(struct platform_device *pdev)
{
- int rc, vasid;
+ int rc, cpu, vasid;
struct resource *res;
struct vas_instance *vinst;
struct device_node *dn = pdev->dev.of_node;
@@ -74,6 +77,11 @@ static int init_vas_instance(struct platform_device *pdev)
"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
vinst->paste_base_addr, vinst->paste_win_id_shift);
+ for_each_possible_cpu(cpu) {
+ if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
+ per_cpu(cpu_vas_id, cpu) = vasid;
+ }
+
mutex_lock(&vas_mutex);
list_add(&vinst->node, &vas_instances);
mutex_unlock(&vas_mutex);
@@ -98,6 +106,10 @@ struct vas_instance *find_vas_instance(int vasid)
struct vas_instance *vinst;
mutex_lock(&vas_mutex);
+
+ if (vasid == -1)
+ vasid = per_cpu(cpu_vas_id, smp_processor_id());
+
list_for_each(ent, &vas_instances) {
vinst = list_entry(ent, struct vas_instance, node);
if (vinst->vas_id == vasid) {
--
2.7.4
next prev parent reply other threads:[~2017-09-17 4:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-17 4:05 [PATCH 00/10] powerpc/vas: cleanup and optimizations Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 01/10] powerpc/vas: init missing fields from [rt]xattr Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 02/10] powerpc/vas: Validate window credits Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 03/10] powerpc/vas: Cleanup some debug code Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 04/10] powerpc/vas: Drop poll_window_cast_out() Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 05/10] powerpc/vas: Use helper to unpin/close window Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 06/10] powerpc/vas: Reduce polling interval for busy state Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 07/10] powerpc/vas: Save configured window credits Sukadev Bhattiprolu
2017-09-17 4:05 ` [PATCH 08/10] powerpc/vas: poll for return of " Sukadev Bhattiprolu
2017-09-17 4:05 ` Sukadev Bhattiprolu [this message]
2017-09-17 4:05 ` [PATCH 10/10] powerpc/vas, nx-842: Define and use chip_to_vas_id() Sukadev Bhattiprolu
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