linux-kernel - [PATCH v3 3/3] Use separate struct console structure for each hvc

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Message-ID: <20111108214509.28884.98169.stgit@miche.sea.corp.google.com>
Date:	Tue, 08 Nov 2011 13:45:09 -0800
From:	Miche Baker-Harvey <miche@...gle.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	xen-devel@...ts.xensource.com,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Anton Blanchard <anton@...ba.org>,
	Amit Shah <amit.shah@...hat.com>,
	Mike Waychison <mikew@...gle.com>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Eric Northrup <digitaleric@...gle.com>
Subject: [PATCH v3 3/3] Use separate struct console structure for each
	hvc_console.

It is possible to make any virtio_console port be a console
by sending VIRITO_CONSOLE_CONSOLE_PORT.  But hvc_alloc was
using a single struct console hvc_console, which contains
both an index and flags which are per-port.

This adds a separate struct console for each virtio_console
that is CONSOLE_PORT.

Signed-off-by: Miche Baker-Harvey <miche@...gle.com>
---
 drivers/tty/hvc/hvc_console.c |   20 ++++++++++++++++++++
 drivers/tty/hvc/hvc_console.h |    1 +
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 09a6159..24a84d6 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -247,6 +247,7 @@ static void destroy_hvc_struct(struct kref *kref)
 
 	spin_unlock(&hvc_structs_lock);
 
+	kfree(hp->hvc_console);
 	kfree(hp);
 }
 
@@ -827,6 +828,7 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 			     int outbuf_size)
 {
 	struct hvc_struct *hp;
+	struct console *cp;
 	int i;
 
 	/* We wait until a driver actually comes along */
@@ -854,6 +856,17 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 	kref_init(&hp->kref);
 
 	INIT_WORK(&hp->tty_resize, hvc_set_winsz);
+	/*
+	 * Make each console its own struct console.
+	 */
+	cp = kmemdup(&hvc_console, sizeof(*cp), GFP_KERNEL);
+	if (!cp) {
+		kfree(hp);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	hp->hvc_console = cp;
+
 	spin_lock_init(&hp->lock);
 	spin_lock(&hvc_structs_lock);
 
@@ -872,8 +885,13 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 
 	hp->index = i;
 
+	cp->index = i;
+	vtermnos[i] = vtermno;
+	cons_ops[i] = ops;
+
 	list_add_tail(&(hp->next), &hvc_structs);
 	spin_unlock(&hvc_structs_lock);
+	register_console(cp);
 
 	return hp;
 }
@@ -884,6 +902,8 @@ int hvc_remove(struct hvc_struct *hp)
 	unsigned long flags;
 	struct tty_struct *tty;
 
+	BUG_ON(!hp->hvc_console);
+	unregister_console(hp->hvc_console);
 	spin_lock_irqsave(&hp->lock, flags);
 	tty = tty_kref_get(hp->tty);
 
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index c335a14..2d20ab7 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -58,6 +58,7 @@ struct hvc_struct {
 	const struct hv_ops *ops;
 	int irq_requested;
 	int data;
+	struct console *hvc_console;
 	struct winsize ws;
 	struct work_struct tty_resize;
 	struct list_head next;

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