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Message-Id: <ddd9f9295e8dbd8aad81bf7e02a4a8076e04654a.1622654100.git.viremana@linux.microsoft.com>
Date: Wed, 2 Jun 2021 17:20:53 +0000
From: Vineeth Pillai <viremana@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
Wei Liu <wei.liu@...nel.org>,
Sunil Muthuswamy <sunilmut@...rosoft.com>,
Michael Kelley <mikelley@...rosoft.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Vineeth Pillai <viremana@...ux.microsoft.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: [PATCH 08/17] mshv: Port id management
Each port in the partition should be uniquely identified by an id.
Partition is responsible for managing the port id.
Signed-off-by: Vineeth Pillai <viremana@...ux.microsoft.com>
---
drivers/hv/Makefile | 2 +-
drivers/hv/hv_portid_table.c | 83 ++++++++++++++++++++++++++++++++++++
drivers/hv/mshv.h | 35 +++++++++++++++
drivers/hv/mshv_main.c | 2 +
4 files changed, 121 insertions(+), 1 deletion(-)
create mode 100644 drivers/hv/hv_portid_table.c
diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
index a2b698661b5e..455a2c01f52c 100644
--- a/drivers/hv/Makefile
+++ b/drivers/hv/Makefile
@@ -13,4 +13,4 @@ hv_vmbus-y := vmbus_drv.o \
hv_vmbus-$(CONFIG_HYPERV_TESTING) += hv_debugfs.o
hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o hv_utils_transport.o
-mshv-y += mshv_main.o hv_call.o hv_synic.o
+mshv-y += mshv_main.o hv_call.o hv_synic.o hv_portid_table.o
diff --git a/drivers/hv/hv_portid_table.c b/drivers/hv/hv_portid_table.c
new file mode 100644
index 000000000000..3e8feefc3fc9
--- /dev/null
+++ b/drivers/hv/hv_portid_table.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <linux/version.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <asm/mshyperv.h>
+
+#include "mshv.h"
+
+/*
+ * Ports and connections are hypervisor struct used for inter-partition
+ * communication. Port represents the source and connection represents
+ * the destination. Partitions are responsible for managing the port and
+ * connection ids.
+ *
+ */
+
+#define PORTID_MIN 1
+#define PORTID_MAX INT_MAX
+
+static DEFINE_IDR(port_table_idr);
+
+void
+hv_port_table_fini(void)
+{
+ struct port_table_info *port_info;
+ unsigned long i, tmp;
+
+ idr_lock(&port_table_idr);
+ if (!idr_is_empty(&port_table_idr)) {
+ idr_for_each_entry_ul(&port_table_idr, port_info, tmp, i) {
+ port_info = idr_remove(&port_table_idr, i);
+ kfree_rcu(port_info, rcu);
+ }
+ }
+ idr_unlock(&port_table_idr);
+}
+
+int
+hv_portid_alloc(struct port_table_info *info)
+{
+ int ret = 0;
+
+ idr_lock(&port_table_idr);
+ ret = idr_alloc(&port_table_idr, info, PORTID_MIN,
+ PORTID_MAX, GFP_KERNEL);
+ idr_unlock(&port_table_idr);
+
+ return ret;
+}
+
+void
+hv_portid_free(int port_id)
+{
+ struct port_table_info *info;
+
+ idr_lock(&port_table_idr);
+ info = idr_remove(&port_table_idr, port_id);
+ WARN_ON(!info);
+ idr_unlock(&port_table_idr);
+
+ synchronize_rcu();
+ kfree(info);
+}
+
+int
+hv_portid_lookup(int port_id, struct port_table_info *info)
+{
+ struct port_table_info *_info;
+ int ret = -ENOENT;
+
+ rcu_read_lock();
+ _info = idr_find(&port_table_idr, port_id);
+ rcu_read_unlock();
+
+ if (_info) {
+ *info = *_info;
+ ret = 0;
+ }
+
+ return ret;
+}
diff --git a/drivers/hv/mshv.h b/drivers/hv/mshv.h
index e16818e977b9..ff5dc02cd8b6 100644
--- a/drivers/hv/mshv.h
+++ b/drivers/hv/mshv.h
@@ -39,6 +39,41 @@ void mshv_isr(void);
int mshv_synic_init(unsigned int cpu);
int mshv_synic_cleanup(unsigned int cpu);
+/*
+ * Callback for doorbell events.
+ * NOTE: This is called in interrupt context. Callback
+ * should defer slow and sleeping logic to later.
+ */
+typedef void (*doorbell_cb_t) (void *);
+
+/*
+ * port table information
+ */
+struct port_table_info {
+ struct rcu_head rcu;
+ enum hv_port_type port_type;
+ union {
+ struct {
+ u64 reserved[2];
+ } port_message;
+ struct {
+ u64 reserved[2];
+ } port_event;
+ struct {
+ u64 reserved[2];
+ } port_monitor;
+ struct {
+ doorbell_cb_t doorbell_cb;
+ void *data;
+ } port_doorbell;
+ };
+};
+
+void hv_port_table_fini(void);
+int hv_portid_alloc(struct port_table_info *info);
+int hv_portid_lookup(int port_id, struct port_table_info *info);
+void hv_portid_free(int port_id);
+
/*
* Hyper-V hypercalls
*/
diff --git a/drivers/hv/mshv_main.c b/drivers/hv/mshv_main.c
index 2adae676dba5..ccf0971d0d39 100644
--- a/drivers/hv/mshv_main.c
+++ b/drivers/hv/mshv_main.c
@@ -1146,6 +1146,8 @@ __exit mshv_exit(void)
cpuhp_remove_state(mshv_cpuhp_online);
free_percpu(mshv.synic_pages);
+ hv_port_table_fini();
+
misc_deregister(&mshv_dev);
}
--
2.25.1
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