powerpc/powernv: Add new opal message type

We have OPAL_MSG_PRD message type to pass prd related messages from
OPAL to `opal-prd`. It can handle messages upto 64 bytes. We have a
requirement to send bigger than 64 bytes of data from OPAL to
`opal-prd`. Lets add new message type (OPAL_MSG_PRD2) to pass bigger
data.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
[mpe: Make the error string clear that it's the PRD2 event that failed]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190826065701.8853-2-hegdevasant@linux.vnet.ibm.com

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 383242e..1cad413 100644 (file)
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -453,6 +453,7 @@ enum opal_msg_type {
        OPAL_MSG_DPO            = 5,
        OPAL_MSG_PRD            = 6,
        OPAL_MSG_OCC            = 7,
+       OPAL_MSG_PRD2           = 8,
        OPAL_MSG_TYPE_MAX,
 };
 

diff --git a/arch/powerpc/platforms/powernv/opal-prd.c b/arch/powerpc/platforms/powernv/opal-prd.c
index e072bf1..45f4223 100644 (file)
--- a/arch/powerpc/platforms/powernv/opal-prd.c
+++ b/arch/powerpc/platforms/powernv/opal-prd.c
@@ -342,7 +342,7 @@ static int opal_prd_msg_notifier(struct notifier_block *nb,
        int msg_size, item_size;
        unsigned long flags;
 
-       if (msg_type != OPAL_MSG_PRD)
+       if (msg_type != OPAL_MSG_PRD && msg_type != OPAL_MSG_PRD2)
                return 0;
 
        /* Calculate total size of the message and item we need to store. The
@@ -393,6 +393,12 @@ static int opal_prd_probe(struct platform_device *pdev)
                return rc;
        }
 
+       rc = opal_message_notifier_register(OPAL_MSG_PRD2, &opal_prd_event_nb);
+       if (rc) {
+               pr_err("Couldn't register PRD2 event notifier\n");
+               return rc;
+       }
+
        rc = misc_register(&opal_prd_dev);
        if (rc) {
                pr_err("failed to register miscdev\n");