linux-kernel - [PATCH RFC 09/12] vdpa_sim: make vdpasim->buffer size configurable

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Message-Id: <20201113134712.69744-10-sgarzare@redhat.com>
Date:   Fri, 13 Nov 2020 14:47:09 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: [PATCH RFC 09/12] vdpa_sim: make vdpasim->buffer size configurable

Allow each device to specify the size of the buffer allocated
in vdpa_sim.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.h     | 1 +
 drivers/vdpa/vdpa_sim/vdpa_sim.c     | 2 +-
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 1 +
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 1 +
 4 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
index f7e1fe0a88d3..cc21e07aa2f7 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -49,6 +49,7 @@ struct vdpasim_device {
 
 struct vdpasim_init_attr {
 	struct vdpasim_device device;
+	size_t buffer_size;
 	int batch_mapping;
 
 	work_func_t	work_fn;
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index bd034fbf4683..3863d49e0d6d 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -223,7 +223,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
 	if (!vdpasim->iommu)
 		goto err_iommu;
 
-	vdpasim->buffer = kvmalloc(PAGE_SIZE, GFP_KERNEL);
+	vdpasim->buffer = kvmalloc(attr->buffer_size, GFP_KERNEL);
 	if (!vdpasim->buffer)
 		goto err_iommu;
 
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index f456a0e4e097..122a3c039507 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -100,6 +100,7 @@ static int __init vdpasim_blk_init(void)
 	attr.device.update_config = vdpasim_blk_update_config;
 
 	attr.work_fn = vdpasim_blk_work;
+	attr.buffer_size = PAGE_SIZE;
 
 	vdpasim_blk_dev = vdpasim_create(&attr);
 	if (IS_ERR(vdpasim_blk_dev)) {
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index b9372fdf2415..d0a1403f64b2 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -124,6 +124,7 @@ static int __init vdpasim_net_init(void)
 
 	attr.work_fn = vdpasim_net_work;
 	attr.batch_mapping = batch_mapping;
+	attr.buffer_size = PAGE_SIZE;
 
 	vdpasim_net_dev = vdpasim_create(&attr);
 	if (IS_ERR(vdpasim_net_dev)) {
-- 
2.26.2