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Subject[PATCH v7 06/21] IB/hns: Add initial cmd operation
Date
This patch added the operation for cmd, and added some functions
for initializing eq table and selecting cmd mode.

Signed-off-by: Wei Hu <xavier.huwei@huawei.com>
Signed-off-by: Nenglong Zhao <zhaonenglong@hisilicon.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
---
drivers/infiniband/hw/hns/hns_roce_cmd.c | 96 +++++++++++++++++++++++++++++
drivers/infiniband/hw/hns/hns_roce_cmd.h | 19 ++++++
drivers/infiniband/hw/hns/hns_roce_common.h | 2 +
drivers/infiniband/hw/hns/hns_roce_device.h | 41 ++++++++++++
drivers/infiniband/hw/hns/hns_roce_main.c | 13 ++++
5 files changed, 171 insertions(+)
create mode 100644 drivers/infiniband/hw/hns/hns_roce_cmd.c
create mode 100644 drivers/infiniband/hw/hns/hns_roce_cmd.h

diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c
new file mode 100644
index 0000000..597c964
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2016 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include "hns_roce_common.h"
+#include "hns_roce_device.h"
+#include "hns_roce_cmd.h"
+
+#define CMD_MAX_NUM 32
+
+int hns_roce_cmd_init(struct hns_roce_dev *hr_dev)
+{
+ struct device *dev = &hr_dev->pdev->dev;
+
+ mutex_init(&hr_dev->cmd.hcr_mutex);
+ sema_init(&hr_dev->cmd.poll_sem, 1);
+ hr_dev->cmd.use_events = 0;
+ hr_dev->cmd.toggle = 1;
+ hr_dev->cmd.max_cmds = CMD_MAX_NUM;
+ hr_dev->cmd.hcr = hr_dev->reg_base + ROCEE_MB1_REG;
+ hr_dev->cmd.pool = dma_pool_create("hns_roce_cmd", dev,
+ HNS_ROCE_MAILBOX_SIZE,
+ HNS_ROCE_MAILBOX_SIZE, 0);
+ if (!hr_dev->cmd.pool) {
+ dev_err(dev, "Couldn't create mailbox pool for cmd.\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev)
+{
+ dma_pool_destroy(hr_dev->cmd.pool);
+}
+
+int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
+{
+ struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
+ int i;
+
+ hr_cmd->context = kmalloc(hr_cmd->max_cmds *
+ sizeof(struct hns_roce_cmd_context),
+ GFP_KERNEL);
+ if (!hr_cmd->context)
+ return -ENOMEM;
+
+ for (i = 0; i < hr_cmd->max_cmds; ++i) {
+ hr_cmd->context[i].token = i;
+ hr_cmd->context[i].next = i + 1;
+ }
+
+ hr_cmd->context[hr_cmd->max_cmds - 1].next = -1;
+ hr_cmd->free_head = 0;
+
+ sema_init(&hr_cmd->event_sem, hr_cmd->max_cmds);
+ spin_lock_init(&hr_cmd->context_lock);
+
+ for (hr_cmd->token_mask = 1; hr_cmd->token_mask < hr_cmd->max_cmds;
+ hr_cmd->token_mask <<= 1)
+ ;
+ --hr_cmd->token_mask;
+ hr_cmd->use_events = 1;
+
+ down(&hr_cmd->poll_sem);
+
+ return 0;
+}
+
+void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev)
+{
+ struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
+ int i;
+
+ hr_cmd->use_events = 0;
+
+ for (i = 0; i < hr_cmd->max_cmds; ++i)
+ down(&hr_cmd->event_sem);
+
+ kfree(hr_cmd->context);
+ up(&hr_cmd->poll_sem);
+}
diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.h b/drivers/infiniband/hw/hns/hns_roce_cmd.h
new file mode 100644
index 0000000..4e102a4
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_cmd.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2016 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _HNS_ROCE_CMD_H
+#define _HNS_ROCE_CMD_H
+
+#include <linux/dma-mapping.h>
+
+enum {
+ HNS_ROCE_MAILBOX_SIZE = 4096
+};
+
+#endif /* _HNS_ROCE_CMD_H */
diff --git a/drivers/infiniband/hw/hns/hns_roce_common.h b/drivers/infiniband/hw/hns/hns_roce_common.h
index 553e2a8..5486e0b 100644
--- a/drivers/infiniband/hw/hns/hns_roce_common.h
+++ b/drivers/infiniband/hw/hns/hns_roce_common.h
@@ -21,4 +21,6 @@

#define ROCEE_ACK_DELAY_REG 0x14

+#define ROCEE_MB1_REG 0x210
+
#endif /* _HNS_ROCE_COMMON_H */
diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index a187678..f5641ed 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -31,6 +31,40 @@

#define ADDR_SHIFT_32 32

+struct hns_roce_cmd_context {
+ int next;
+ u16 token;
+};
+
+struct hns_roce_cmdq {
+ struct dma_pool *pool;
+ u8 __iomem *hcr;
+ struct mutex hcr_mutex;
+ struct semaphore poll_sem;
+ /*
+ * Event mode: cmd register mutex protection,
+ * ensure to not exceed max_cmds and user use limit region
+ */
+ struct semaphore event_sem;
+ int max_cmds;
+ spinlock_t context_lock;
+ int free_head;
+ struct hns_roce_cmd_context *context;
+ /*
+ * Result of get integer part
+ * which max_comds compute according a power of 2
+ */
+ u16 token_mask;
+ /*
+ * Process whether use event mode, init default non-zero
+ * After the event queue of cmd event ready,
+ * can switch into event mode
+ * close device, switch into poll mode(non event mode)
+ */
+ u8 use_events;
+ u8 toggle;
+};
+
struct hns_roce_ib_iboe {
struct net_device *netdevs[HNS_ROCE_MAX_PORTS];
u8 phy_port[HNS_ROCE_MAX_PORTS];
@@ -100,11 +134,18 @@ struct hns_roce_dev {
u32 vendor_part_id;
u32 hw_rev;

+ struct hns_roce_cmdq cmd;
+
int cmd_mod;
int loop_idc;
struct hns_roce_hw *hw;
};

+int hns_roce_cmd_init(struct hns_roce_dev *hr_dev);
+void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev);
+int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev);
+void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev);
+
extern struct hns_roce_hw hns_roce_hw_v1;

#endif /* _HNS_ROCE_DEVICE_H */
diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 4aa10d2..07b6fda 100644
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -39,6 +39,7 @@
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_verbs.h>
+#include "hns_roce_common.h"
#include "hns_roce_device.h"

int hns_roce_get_cfg(struct hns_roce_dev *hr_dev)
@@ -158,6 +159,17 @@ static int hns_roce_probe(struct platform_device *pdev)

hns_roce_profile_init(hr_dev);

+ ret = hns_roce_cmd_init(hr_dev);
+ if (ret) {
+ dev_err(dev, "cmd init failed!\n");
+ goto error_failed_cmd_init;
+ }
+
+error_failed_cmd_init:
+ ret = hns_roce_engine_reset(hr_dev, false);
+ if (ret)
+ dev_err(&hr_dev->pdev->dev, "roce_engine reset fail\n");
+
error_failed_get_cfg:
ib_dealloc_device(&hr_dev->ib_dev);

@@ -172,6 +184,7 @@ static int hns_roce_remove(struct platform_device *pdev)
{
struct hns_roce_dev *hr_dev = platform_get_drvdata(pdev);

+ hns_roce_cmd_cleanup(hr_dev);
(void)hns_roce_engine_reset(hr_dev, false);

ib_dealloc_device(&hr_dev->ib_dev);
--
1.9.1
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