You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
From 703b2ca94467a029942fa478a38f0a14c8109766 Mon Sep 17 00:00:00 2001
|
|
From: Bharat Bhushan <bharat.bhushan@nxp.com>
|
|
Date: Fri, 1 Mar 2019 13:33:58 +0800
|
|
Subject: [PATCH] vfio/fsl-mc: Improve send mc-command and read response
|
|
|
|
Actually there is no ordering need when reading response
|
|
from mc-portal. Similarly when writing the mc-command,
|
|
ordering needed before command is submitted.
|
|
|
|
This patch removes un-necessary barriers, response is read
|
|
relaxed and maintain ordering when submit command. This also
|
|
fixes compilation issue with newer kernel.
|
|
|
|
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
|
|
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
|
|
---
|
|
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 13 +++++++------
|
|
1 file changed, 7 insertions(+), 6 deletions(-)
|
|
|
|
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
|
|
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
|
|
@@ -331,9 +331,7 @@ static int vfio_fsl_mc_dprc_wait_for_res
|
|
u64 header;
|
|
struct mc_cmd_header *resp_hdr;
|
|
|
|
- __iormb();
|
|
- header = readq(ioaddr);
|
|
- __iormb();
|
|
+ header = cpu_to_le64(readq_relaxed(ioaddr));
|
|
|
|
resp_hdr = (struct mc_cmd_header *)&header;
|
|
status = (enum mc_cmd_status)resp_hdr->status;
|
|
@@ -353,9 +351,12 @@ static int vfio_fsl_mc_send_command(void
|
|
{
|
|
int i;
|
|
|
|
- /* Write at command header in the end */
|
|
- for (i = 7; i >= 0; i--)
|
|
- writeq(cmd_data[i], ioaddr + i * sizeof(uint64_t));
|
|
+ /* Write at command parameter into portal */
|
|
+ for (i = 7; i >= 1; i--)
|
|
+ writeq_relaxed(cmd_data[i], ioaddr + i * sizeof(uint64_t));
|
|
+
|
|
+ /* Write command header in the end */
|
|
+ writeq(cmd_data[0], ioaddr);
|
|
|
|
/* Wait for response before returning to user-space
|
|
* This can be optimized in future to even prepare response
|