[Minios-devel] [UNIKRAFT PATCH 4/9] plat/xen/drivers/9p: Add device list

[Vlad-Andrei BĂDOIU (78692) <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>]

From: Cristian Banu <cristb@xxxxxxxxx>

This patch adds the 9pfront device list. 9pfront devices are added to
the list when probed.

Signed-off-by: Cristian Banu <cristb@xxxxxxxxx>
---
 plat/xen/drivers/9p/9pfront.c | 46 ++++++++++++++++++++++++++++++++---
 plat/xen/drivers/9p/9pfront.h |  2 ++
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/plat/xen/drivers/9p/9pfront.c b/plat/xen/drivers/9p/9pfront.c
index 8c9880e8..f289cd05 100644
--- a/plat/xen/drivers/9p/9pfront.c
+++ b/plat/xen/drivers/9p/9pfront.c
@@ -32,18 +32,58 @@
  * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
  */
 
+#include <uk/config.h>
+#include <uk/alloc.h>
+#include <uk/assert.h>
+#include <uk/essentials.h>
+#include <uk/list.h>
+#include <uk/plat/spinlock.h>
 #include <xenbus/xenbus.h>
 
+#include "9pfront_xb.h"
+
 #define DRIVER_NAME    "xen-9pfront"
 
-static int p9front_drv_init(struct uk_alloc *drv_allocator __unused)
+static struct uk_alloc *a;
+static UK_LIST_HEAD(p9front_device_list);
+static DEFINE_SPINLOCK(p9front_device_list_lock);
+
+static int p9front_drv_init(struct uk_alloc *drv_allocator)
 {
+       if (!drv_allocator)
+               return -EINVAL;
+
+       a = drv_allocator;
+
        return 0;
 }
 
-static int p9front_add_dev(struct xenbus_device *xendev __unused)
+static int p9front_add_dev(struct xenbus_device *xendev)
 {
-       return 0;
+       struct p9front_dev *p9fdev;
+       int rc;
+       unsigned long flags;
+
+       p9fdev = uk_calloc(a, 1, sizeof(*p9fdev));
+       if (!p9fdev) {
+               rc = -ENOMEM;
+               goto out;
+       }
+
+       p9fdev->xendev = xendev;
+       rc = p9front_xb_init(p9fdev);
+       if (rc)
+               goto out_free;
+
+       rc = 0;
+       ukplat_spin_lock_irqsave(&p9front_device_list_lock, flags);
+       uk_list_add(&p9fdev->_list, &p9front_device_list);
+       ukplat_spin_unlock_irqrestore(&p9front_device_list_lock, flags);
+
+out_free:
+       uk_free(a, p9fdev);
+out:
+       return rc;
 }
 
 static const xenbus_dev_type_t p9front_devtypes[] = {
diff --git a/plat/xen/drivers/9p/9pfront.h b/plat/xen/drivers/9p/9pfront.h
index 0dd99d6c..e77f315a 100644
--- a/plat/xen/drivers/9p/9pfront.h
+++ b/plat/xen/drivers/9p/9pfront.h
@@ -42,6 +42,8 @@
 struct p9front_dev {
        /* Xenbus device. */
        struct xenbus_device *xendev;
+       /* Entry within the 9pfront device list. */
+       struct uk_list_head _list;
        /* Number of maximum rings, read from xenstore. */
        int nb_max_rings;
        /* Maximum ring page order, read from xenstore. */
-- 
2.20.1


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