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Subject[PATCH V5 XRT Alveo 19/20] fpga: xrt: partition isolation driver
Date
Add partition isolation xrt driver. partition isolation is
a hardware function discovered by walking firmware metadata.
A xrt device node will be created for it. Partition isolation
function isolate the different fpga regions

Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
Signed-off-by: Max Zhen <max.zhen@xilinx.com>
Signed-off-by: Lizhi Hou <lizhi.hou@xilinx.com>
---
drivers/fpga/xrt/include/xleaf/axigate.h | 23 ++
drivers/fpga/xrt/lib/xleaf/axigate.c | 325 +++++++++++++++++++++++
2 files changed, 348 insertions(+)
create mode 100644 drivers/fpga/xrt/include/xleaf/axigate.h
create mode 100644 drivers/fpga/xrt/lib/xleaf/axigate.c

diff --git a/drivers/fpga/xrt/include/xleaf/axigate.h b/drivers/fpga/xrt/include/xleaf/axigate.h
new file mode 100644
index 000000000000..58f32c76dca1
--- /dev/null
+++ b/drivers/fpga/xrt/include/xleaf/axigate.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#ifndef _XRT_AXIGATE_H_
+#define _XRT_AXIGATE_H_
+
+#include "xleaf.h"
+#include "metadata.h"
+
+/*
+ * AXIGATE driver leaf calls.
+ */
+enum xrt_axigate_leaf_cmd {
+ XRT_AXIGATE_CLOSE = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
+ XRT_AXIGATE_OPEN,
+};
+
+#endif /* _XRT_AXIGATE_H_ */
diff --git a/drivers/fpga/xrt/lib/xleaf/axigate.c b/drivers/fpga/xrt/lib/xleaf/axigate.c
new file mode 100644
index 000000000000..493707b782e4
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/axigate.c
@@ -0,0 +1,325 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA AXI Gate Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou<Lizhi.Hou@xilinx.com>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/io.h>
+#include "metadata.h"
+#include "xleaf.h"
+#include "xleaf/axigate.h"
+
+#define XRT_AXIGATE "xrt_axigate"
+
+#define XRT_AXIGATE_WRITE_REG 0
+#define XRT_AXIGATE_READ_REG 8
+
+#define XRT_AXIGATE_CTRL_CLOSE 0
+#define XRT_AXIGATE_CTRL_OPEN_BIT0 1
+#define XRT_AXIGATE_CTRL_OPEN_BIT1 2
+
+#define XRT_AXIGATE_INTERVAL 500 /* ns */
+
+struct xrt_axigate {
+ struct xrt_device *xdev;
+ struct regmap *regmap;
+ struct mutex gate_lock; /* gate dev lock */
+ void *evt_hdl;
+ const char *ep_name;
+ bool gate_closed;
+};
+
+XRT_DEFINE_REGMAP_CONFIG(axigate_regmap_config);
+
+/* the ep names are in the order of hardware layers */
+static const char * const xrt_axigate_epnames[] = {
+ XRT_MD_NODE_GATE_PLP, /* PLP: Provider Logic Partition */
+ XRT_MD_NODE_GATE_ULP /* ULP: User Logic Partition */
+};
+
+static inline int close_gate(struct xrt_axigate *gate)
+{
+ u32 val;
+ int ret;
+
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG, XRT_AXIGATE_CTRL_CLOSE);
+ if (ret) {
+ xrt_err(gate->xdev, "write gate failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ /*
+ * Legacy hardware requires extra read work properly.
+ * This is not on critical path, thus the extra read should not impact performance much.
+ */
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->xdev, "read gate failed %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static inline int open_gate(struct xrt_axigate *gate)
+{
+ u32 val;
+ int ret;
+
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG, XRT_AXIGATE_CTRL_OPEN_BIT1);
+ if (ret) {
+ xrt_err(gate->xdev, "write 2 failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ /*
+ * Legacy hardware requires extra read work properly.
+ * This is not on critical path, thus the extra read should not impact performance much.
+ */
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->xdev, "read 2 failed %d", ret);
+ return ret;
+ }
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG,
+ XRT_AXIGATE_CTRL_OPEN_BIT0 | XRT_AXIGATE_CTRL_OPEN_BIT1);
+ if (ret) {
+ xrt_err(gate->xdev, "write 3 failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->xdev, "read 3 failed %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int xrt_axigate_epname_idx(struct xrt_device *xdev)
+{
+ struct resource *res;
+ int ret, i;
+
+ res = xrt_get_resource(xdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ xrt_err(xdev, "Empty Resource!");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(xrt_axigate_epnames); i++) {
+ ret = strncmp(xrt_axigate_epnames[i], res->name,
+ strlen(xrt_axigate_epnames[i]) + 1);
+ if (!ret)
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int xrt_axigate_close(struct xrt_device *xdev)
+{
+ struct xrt_axigate *gate;
+ u32 status = 0;
+ int ret;
+
+ gate = xrt_get_drvdata(xdev);
+
+ mutex_lock(&gate->gate_lock);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &status);
+ if (ret) {
+ xrt_err(xdev, "read gate failed %d", ret);
+ goto failed;
+ }
+ if (status) { /* gate is opened */
+ xleaf_broadcast_event(xdev, XRT_EVENT_PRE_GATE_CLOSE, false);
+ ret = close_gate(gate);
+ if (ret)
+ goto failed;
+ }
+
+ gate->gate_closed = true;
+
+failed:
+ mutex_unlock(&gate->gate_lock);
+
+ xrt_info(xdev, "close gate %s", gate->ep_name);
+ return ret;
+}
+
+static int xrt_axigate_open(struct xrt_device *xdev)
+{
+ struct xrt_axigate *gate;
+ u32 status;
+ int ret;
+
+ gate = xrt_get_drvdata(xdev);
+
+ mutex_lock(&gate->gate_lock);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &status);
+ if (ret) {
+ xrt_err(xdev, "read gate failed %d", ret);
+ goto failed;
+ }
+ if (!status) { /* gate is closed */
+ ret = open_gate(gate);
+ if (ret)
+ goto failed;
+ xleaf_broadcast_event(xdev, XRT_EVENT_POST_GATE_OPEN, true);
+ /* xrt_axigate_open() could be called in event cb, thus
+ * we can not wait for the completes
+ */
+ }
+
+ gate->gate_closed = false;
+
+failed:
+ mutex_unlock(&gate->gate_lock);
+
+ xrt_info(xdev, "open gate %s", gate->ep_name);
+ return ret;
+}
+
+static void xrt_axigate_event_cb(struct xrt_device *xdev, void *arg)
+{
+ struct xrt_axigate *gate = xrt_get_drvdata(xdev);
+ struct xrt_event *evt = (struct xrt_event *)arg;
+ enum xrt_events e = evt->xe_evt;
+ struct xrt_device *leaf;
+ enum xrt_subdev_id id;
+ struct resource *res;
+ int instance;
+
+ if (e != XRT_EVENT_POST_CREATION)
+ return;
+
+ instance = evt->xe_subdev.xevt_subdev_instance;
+ id = evt->xe_subdev.xevt_subdev_id;
+ if (id != XRT_SUBDEV_AXIGATE)
+ return;
+
+ leaf = xleaf_get_leaf_by_id(xdev, id, instance);
+ if (!leaf)
+ return;
+
+ res = xrt_get_resource(leaf, IORESOURCE_MEM, 0);
+ if (!res || !strncmp(res->name, gate->ep_name, strlen(res->name) + 1)) {
+ xleaf_put_leaf(xdev, leaf);
+ return;
+ }
+
+ /* higher level axigate instance created, make sure the gate is opened. */
+ if (xrt_axigate_epname_idx(leaf) > xrt_axigate_epname_idx(xdev))
+ xrt_axigate_open(xdev);
+ else
+ xleaf_call(leaf, XRT_AXIGATE_OPEN, NULL);
+
+ xleaf_put_leaf(xdev, leaf);
+}
+
+static int
+xrt_axigate_leaf_call(struct xrt_device *xdev, u32 cmd, void *arg)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ xrt_axigate_event_cb(xdev, arg);
+ break;
+ case XRT_AXIGATE_CLOSE:
+ ret = xrt_axigate_close(xdev);
+ break;
+ case XRT_AXIGATE_OPEN:
+ ret = xrt_axigate_open(xdev);
+ break;
+ default:
+ xrt_err(xdev, "unsupported cmd %d", cmd);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int xrt_axigate_probe(struct xrt_device *xdev)
+{
+ struct xrt_axigate *gate = NULL;
+ void __iomem *base = NULL;
+ struct resource *res;
+ int ret;
+
+ gate = devm_kzalloc(&xdev->dev, sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ return -ENOMEM;
+
+ gate->xdev = xdev;
+ xrt_set_drvdata(xdev, gate);
+
+ xrt_info(xdev, "probing...");
+ res = xrt_get_resource(xdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ xrt_err(xdev, "Empty resource 0");
+ ret = -EINVAL;
+ goto failed;
+ }
+
+ base = devm_ioremap_resource(&xdev->dev, res);
+ if (IS_ERR(base)) {
+ xrt_err(xdev, "map base iomem failed");
+ ret = PTR_ERR(base);
+ goto failed;
+ }
+
+ gate->regmap = devm_regmap_init_mmio(&xdev->dev, base, &axigate_regmap_config);
+ if (IS_ERR(gate->regmap)) {
+ xrt_err(xdev, "regmap %pR failed", res);
+ ret = PTR_ERR(gate->regmap);
+ goto failed;
+ }
+ gate->ep_name = res->name;
+
+ mutex_init(&gate->gate_lock);
+
+ return 0;
+
+failed:
+ return ret;
+}
+
+static struct xrt_dev_endpoints xrt_axigate_endpoints[] = {
+ {
+ .xse_names = (struct xrt_dev_ep_names[]) {
+ { .ep_name = XRT_MD_NODE_GATE_ULP },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ {
+ .xse_names = (struct xrt_dev_ep_names[]) {
+ { .ep_name = XRT_MD_NODE_GATE_PLP },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_driver xrt_axigate_driver = {
+ .driver = {
+ .name = XRT_AXIGATE,
+ },
+ .subdev_id = XRT_SUBDEV_AXIGATE,
+ .endpoints = xrt_axigate_endpoints,
+ .probe = xrt_axigate_probe,
+ .leaf_call = xrt_axigate_leaf_call,
+};
+
+XRT_LEAF_INIT_FINI_FUNC(axigate);
--
2.27.0
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