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Subject[PATCH 15/22] NTB AMD: Add port-related NTB API callback methods
Date
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

---
drivers/ntb/hw/amd/ntb_hw_amd.c | 72 ++++++++++++++++++++++++++++++-----------
drivers/ntb/hw/amd/ntb_hw_amd.h | 10 ++++++
2 files changed, 63 insertions(+), 19 deletions(-)

diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 6704327..b7c9f67 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -71,6 +71,33 @@ MODULE_AUTHOR("AMD Inc.");
static const struct file_operations amd_ntb_debugfs_info;
static struct dentry *debugfs_dir;

+static int amd_ntb_port_number(struct ntb_dev *ntb)
+{
+ return ntb->port;
+}
+
+static int amd_ntb_peer_port_count(struct ntb_dev *ntb)
+{
+ return NTB_PEER_CNT;
+}
+
+static int amd_ntb_peer_port_number(struct ntb_dev *ntb, int pidx)
+{
+ if (pidx > NTB_PIDX_MAX)
+ return -EINVAL;
+
+ return (ntb->port == NTB_PORT_PRI ? NTB_PORT_SEC : NTB_PORT_PRI);
+}
+
+static int amd_ntb_peer_port_idx(struct ntb_dev *ntb, int port)
+{
+ if ((ntb->port == NTB_PORT_PRI && port != NTB_PORT_SEC) ||
+ (ntb->port == NTB_PORT_SEC && port != NTB_PORT_PRI))
+ return -EINVAL;
+
+ return 0;
+}
+
static int amd_link_is_up(struct amd_ntb_dev *ndev)
{
if (!ndev->peer_sta)
@@ -90,7 +117,7 @@ static int amd_link_is_up(struct amd_ntb_dev *ndev)
return 0;
}

-static int amd_ntb_link_is_up(struct ntb_dev *ntb,
+static u64 amd_ntb_link_is_up(struct ntb_dev *ntb,
enum ntb_speed *speed,
enum ntb_width *width)
{
@@ -130,7 +157,7 @@ static int amd_ntb_link_enable(struct ntb_dev *ntb,
ndev->int_mask &= ~AMD_EVENT_INTMASK;
writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);

- if (ndev->ntb.topo == NTB_TOPO_SEC)
+ if (ndev->ntb.port == NTB_PORT_SEC)
return -EINVAL;
dev_dbg(ndev_dev(ndev), "Enabling Link.\n");

@@ -151,7 +178,7 @@ static int amd_ntb_link_disable(struct ntb_dev *ntb)
ndev->int_mask |= AMD_EVENT_INTMASK;
writel(ndev->int_mask, mmio + AMD_INTMASK_OFFSET);

- if (ndev->ntb.topo == NTB_TOPO_SEC)
+ if (ndev->ntb.port == NTB_PORT_SEC)
return -EINVAL;
dev_dbg(ndev_dev(ndev), "Enabling Link.\n");

@@ -431,6 +458,10 @@ static int amd_ntb_peer_spad_write(struct ntb_dev *ntb,
}

static const struct ntb_dev_ops amd_ntb_ops = {
+ .port_number = amd_ntb_port_number,
+ .peer_port_count = amd_ntb_peer_port_count,
+ .peer_port_number = amd_ntb_peer_port_number,
+ .peer_port_idx = amd_ntb_peer_port_idx,
.link_is_up = amd_ntb_link_is_up,
.link_enable = amd_ntb_link_enable,
.link_disable = amd_ntb_link_disable,
@@ -697,8 +728,8 @@ static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
"NTB Device Information:\n");

off += scnprintf(buf + off, buf_size - off,
- "Connection Topology -\t%s\n",
- ntb_topo_string(ndev->ntb.topo));
+ "Connection Topology -\t%s:%d\n",
+ ntb_topo_string(ndev->ntb.topo), ndev->ntb.port);

off += scnprintf(buf + off, buf_size - off,
"LNK STA -\t\t%#06x\n", ndev->lnk_sta);
@@ -797,6 +828,7 @@ static inline void ndev_init_struct(struct amd_ntb_dev *ndev,
{
ndev->ntb.pdev = pdev;
ndev->ntb.topo = NTB_TOPO_NONE;
+ ndev->ntb.port = NTB_PORT_NONE;
ndev->ntb.ops = &amd_ntb_ops;
ndev->int_mask = AMD_EVENT_INTMASK;
spin_lock_init(&ndev->db_mask_lock);
@@ -876,23 +908,23 @@ static int amd_init_ntb(struct amd_ntb_dev *ndev)
ndev->spad_count = AMD_SPADS_CNT;
ndev->db_count = AMD_DB_CNT;

- switch (ndev->ntb.topo) {
- case NTB_TOPO_PRI:
- case NTB_TOPO_SEC:
+ if (ndev->ntb.topo == NTB_TOPO_P2P) {
ndev->spad_count >>= 1;
- if (ndev->ntb.topo == NTB_TOPO_PRI) {
+ if (ndev->ntb.port == NTB_PORT_PRI) {
ndev->self_spad = 0;
ndev->peer_spad = 0x20;
- } else {
+ } else if (ndev->ntb.port == NTB_PORT_SEC) {
ndev->self_spad = 0x20;
ndev->peer_spad = 0;
+ } else {
+ dev_err(ndev_dev(ndev), "Invalid topology port %d.\n",
+ ndev->ntb.port);
+ return -EINVAL;
}

INIT_DELAYED_WORK(&ndev->hb_timer, amd_link_hb);
schedule_delayed_work(&ndev->hb_timer, AMD_LINK_HB_TIMEOUT);
-
- break;
- default:
+ } else {
dev_err(ndev_dev(ndev), "AMD NTB does not support B2B mode.\n");
return -EINVAL;
}
@@ -905,16 +937,18 @@ static int amd_init_ntb(struct amd_ntb_dev *ndev)
return 0;
}

-static enum ntb_topo amd_get_topo(struct amd_ntb_dev *ndev)
+static void amd_init_topo(struct amd_ntb_dev *ndev)
{
void __iomem *mmio = ndev->self_mmio;
u32 info;

+ ndev->ntb.topo = NTB_TOPO_P2P;
+
info = readl(mmio + AMD_SIDEINFO_OFFSET);
if (info & AMD_SIDE_MASK)
- return NTB_TOPO_SEC;
+ ndev->ntb.port = NTB_PORT_SEC;
else
- return NTB_TOPO_PRI;
+ ndev->ntb.port = NTB_PORT_PRI;
}

static int amd_init_dev(struct amd_ntb_dev *ndev)
@@ -924,9 +958,9 @@ static int amd_init_dev(struct amd_ntb_dev *ndev)

pdev = ndev_pdev(ndev);

- ndev->ntb.topo = amd_get_topo(ndev);
- dev_dbg(ndev_dev(ndev), "AMD NTB topo is %s\n",
- ntb_topo_string(ndev->ntb.topo));
+ amd_init_topo(ndev);
+ dev_dbg(ndev_dev(ndev), "AMD NTB topo is %s:%d\n",
+ ntb_topo_string(ndev->ntb.topo), ndev->ntb.port);

rc = amd_init_ntb(ndev);
if (rc)
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h
index 2eac3cd..993e053 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.h
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.h
@@ -62,6 +62,10 @@
#define NTB_LNK_STA_SPEED(x) (((x) & NTB_LNK_STA_SPEED_MASK) >> 16)
#define NTB_LNK_STA_WIDTH(x) (((x) & NTB_LNK_STA_WIDTH_MASK) >> 20)

+/* port related constants */
+#define NTB_PEER_CNT (1)
+#define NTB_PIDX_MAX (0)
+
#ifndef read64
#ifdef readq
#define read64 readq
@@ -167,6 +171,12 @@ enum {
AMD_PEER_OFFSET = 0x400,
};

+enum amd_ntb_port {
+ NTB_PORT_NONE = -1,
+ NTB_PORT_PRI,
+ NTB_PORT_SEC
+};
+
struct amd_ntb_dev;

struct amd_ntb_vec {
--
2.6.6
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