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Commit 2826880e authored by Murali Nalajala's avatar Murali Nalajala
Browse files

hh_rm_core: delay sending characters to RM 



No flow control mechanism exist in RM console. That means when there is
huge messages sent from SVM to PVM there is a possibility that messages
being dropped by RM and hence loss of messages on console. Add a delay
of 800us for every console write and flush calls.

Change-Id: I65fb7a347b093d079c1380765c63b38bf90e0b66
Signed-off-by: default avatarMurali Nalajala <mnalajal@codeaurora.org>
parent 76a04e42

drivers/tty/hvc/hvc_haven.c

+3 −1
Original line number Diff line number Diff line
@@ -85,7 +85,9 @@ static int hh_hvc_notify_console_chars(struct notifier_block *this, 
		pr_warn_ratelimited("dropped %d bytes from VM%d - full fifo\n",

				    msg->num_bytes - ret, vm_name);



	if (hvc_poll(hh_hvc_data[vm_name].hvc))

		hvc_kick();



	return NOTIFY_OK;

}

drivers/virt/haven/hh_rm_core.c

+6 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/notifier.h>

#include <linux/irqdomain.h>

#include <linux/workqueue.h>

#include <linux/delay.h>

#include <linux/completion.h>

#include <linux/mod_devicetable.h>

#include <linux/platform_device.h>
@@ -530,6 +531,11 @@ static int hh_rm_send_request(u32 message_id, 
		 */

		tx_flags = (i == num_fragments) ? HH_MSGQ_TX_PUSH : 0;



		/* delay sending console characters to RM */

		if (message_id == HH_RM_RPC_MSG_ID_CALL_VM_CONSOLE_WRITE ||

		    message_id == HH_RM_RPC_MSG_ID_CALL_VM_CONSOLE_FLUSH)

			udelay(800);



		ret = hh_msgq_send(hh_rm_msgq_desc, send_buff,

					sizeof(*hdr) + payload_size, tx_flags);