[PATCH V5 XRT Alveo 12/20] fpga: xrt: VSEC driver

Lizhi Hou
2021-04-27T21:01:09Z

Add VSEC driver. VSEC is a hardware function discovered by walking
PCI Express configure space. A xrt device node will be created for it.
VSEC provides board logic UUID and few offset of other hardware functions.

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/lib/xleaf/vsec.c | 372 ++++++++++++++++++++++++++++++
1 file changed, 372 insertions(+)
create mode 100644 drivers/fpga/xrt/lib/xleaf/vsec.c

diff --git a/drivers/fpga/xrt/lib/xleaf/vsec.c b/drivers/fpga/xrt/lib/xleaf/vsec.c
new file mode 100644
index 000000000000..2bc7578c5f5d
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/vsec.c
@@ -0,0 +1,372 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA VSEC Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou<Lizhi.Hou@xilinx.com>
+ */
+
+#include <linux/regmap.h>
+#include "metadata.h"
+#include "xdevice.h"
+#include "xleaf.h"
+
+#define XRT_VSEC "xrt_vsec"
+
+#define VSEC_TYPE_UUID 0x50
+#define VSEC_TYPE_FLASH 0x51
+#define VSEC_TYPE_PLATINFO 0x52
+#define VSEC_TYPE_MAILBOX 0x53
+#define VSEC_TYPE_END 0xff
+
+#define VSEC_UUID_LEN 16
+
+#define VSEC_REG_FORMAT 0x0
+#define VSEC_REG_LENGTH 0x4
+#define VSEC_REG_ENTRY 0x8
+
+struct xrt_vsec_header {
+ u32 format;
+ u32 length;
+ u32 entry_sz;
+ u32 rsvd;
+} __packed;
+
+struct xrt_vsec_entry {
+ u8 type;
+ u8 bar_rev;
+ u16 off_lo;
+ u32 off_hi;
+ u8 ver_type;
+ u8 minor;
+ u8 major;
+ u8 rsvd0;
+ u32 rsvd1;
+} __packed;
+
+struct vsec_device {
+ u8 type;
+ char *ep_name;
+ ulong size;
+ char *compat;
+};
+
+static struct vsec_device vsec_devs[] = {
+ {
+ .type = VSEC_TYPE_UUID,
+ .ep_name = XRT_MD_NODE_BLP_ROM,
+ .size = VSEC_UUID_LEN,
+ .compat = "vsec-uuid",
+ },
+ {
+ .type = VSEC_TYPE_FLASH,
+ .ep_name = XRT_MD_NODE_FLASH_VSEC,
+ .size = 4096,
+ .compat = "vsec-flash",
+ },
+ {
+ .type = VSEC_TYPE_PLATINFO,
+ .ep_name = XRT_MD_NODE_PLAT_INFO,
+ .size = 4,
+ .compat = "vsec-platinfo",
+ },
+ {
+ .type = VSEC_TYPE_MAILBOX,
+ .ep_name = XRT_MD_NODE_MAILBOX_VSEC,
+ .size = 48,
+ .compat = "vsec-mbx",
+ },
+};
+
+XRT_DEFINE_REGMAP_CONFIG(vsec_regmap_config);
+
+struct xrt_vsec {
+ struct xrt_device *xdev;
+ struct regmap *regmap;
+ u32 length;
+
+ char *metadata;
+ char uuid[VSEC_UUID_LEN];
+ int group;
+};
+
+static inline int vsec_read_entry(struct xrt_vsec *vsec, u32 index, struct xrt_vsec_entry *entry)
+{
+ int ret;
+
+ ret = regmap_bulk_read(vsec->regmap, sizeof(struct xrt_vsec_header) +
+ index * sizeof(struct xrt_vsec_entry), entry,
+ sizeof(struct xrt_vsec_entry) /
+ vsec_regmap_config.reg_stride);
+
+ return ret;
+}
+
+static inline u32 vsec_get_bar(struct xrt_vsec_entry *entry)
+{
+ return (entry->bar_rev >> 4) & 0xf;
+}
+
+static inline u64 vsec_get_bar_off(struct xrt_vsec_entry *entry)
+{
+ return entry->off_lo | ((u64)entry->off_hi << 16);
+}
+
+static inline u32 vsec_get_rev(struct xrt_vsec_entry *entry)
+{
+ return entry->bar_rev & 0xf;
+}
+
+static char *type2epname(u32 type)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
+ if (vsec_devs[i].type == type)
+ return (vsec_devs[i].ep_name);
+ }
+
+ return NULL;
+}
+
+static ulong type2size(u32 type)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
+ if (vsec_devs[i].type == type)
+ return (vsec_devs[i].size);
+ }
+
+ return 0;
+}
+
+static char *type2compat(u32 type)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
+ if (vsec_devs[i].type == type)
+ return (vsec_devs[i].compat);
+ }
+
+ return NULL;
+}
+
+static int xrt_vsec_add_node(struct xrt_vsec *vsec,
+ void *md_blob, struct xrt_vsec_entry *p_entry)
+{
+ struct xrt_md_endpoint ep;
+ char compat_ver[64];
+ int ret;
+
+ if (!type2epname(p_entry->type))
+ return -EINVAL;
+
+ /*
+ * VSEC may have more than 1 mailbox instance for the card
+ * which has more than 1 physical function.
+ * This is not supported for now. Assuming only one mailbox
+ */
+
+ snprintf(compat_ver, sizeof(compat_ver) - 1, "%d-%d.%d.%d",
+ p_entry->ver_type, p_entry->major, p_entry->minor,
+ vsec_get_rev(p_entry));
+ ep.ep_name = type2epname(p_entry->type);
+ ep.bar_index = vsec_get_bar(p_entry);
+ ep.bar_off = vsec_get_bar_off(p_entry);
+ ep.size = type2size(p_entry->type);
+ ep.compat = type2compat(p_entry->type);
+ ep.compat_ver = compat_ver;
+ ret = xrt_md_add_endpoint(DEV(vsec->xdev), vsec->metadata, &ep);
+ if (ret)
+ xrt_err(vsec->xdev, "add ep failed, ret %d", ret);
+
+ return ret;
+}
+
+static int xrt_vsec_create_metadata(struct xrt_vsec *vsec)
+{
+ struct xrt_vsec_entry entry;
+ int i, ret;
+
+ ret = xrt_md_create(&vsec->xdev->dev, &vsec->metadata);
+ if (ret) {
+ xrt_err(vsec->xdev, "create metadata failed");
+ return ret;
+ }
+
+ for (i = 0; i * sizeof(entry) < vsec->length -
+ sizeof(struct xrt_vsec_header); i++) {
+ ret = vsec_read_entry(vsec, i, &entry);
+ if (ret) {
+ xrt_err(vsec->xdev, "failed read entry %d, ret %d", i, ret);
+ goto fail;
+ }
+
+ if (entry.type == VSEC_TYPE_END)
+ break;
+ ret = xrt_vsec_add_node(vsec, vsec->metadata, &entry);
+ if (ret)
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ vfree(vsec->metadata);
+ vsec->metadata = NULL;
+ return ret;
+}
+
+static int xrt_vsec_leaf_call(struct xrt_device *xdev, u32 cmd, void *arg)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ /* Does not handle any event. */
+ break;
+ default:
+ ret = -EINVAL;
+ xrt_err(xdev, "should never been called");
+ break;
+ }
+
+ return ret;
+}
+
+static int xrt_vsec_mapio(struct xrt_vsec *vsec)
+{
+ struct xrt_subdev_platdata *pdata = DEV_PDATA(vsec->xdev);
+ struct resource *res = NULL;
+ void __iomem *base = NULL;
+ const u64 *bar_off;
+ const u32 *bar;
+ u64 addr;
+ int ret;
+
+ if (!pdata || xrt_md_size(DEV(vsec->xdev), pdata->xsp_dtb) == XRT_MD_INVALID_LENGTH) {
+ xrt_err(vsec->xdev, "empty metadata");
+ return -EINVAL;
+ }
+
+ ret = xrt_md_get_prop(DEV(vsec->xdev), pdata->xsp_dtb, XRT_MD_NODE_VSEC,
+ NULL, XRT_MD_PROP_BAR_IDX, (const void **)&bar, NULL);
+ if (ret) {
+ xrt_err(vsec->xdev, "failed to get bar idx, ret %d", ret);
+ return -EINVAL;
+ }
+
+ ret = xrt_md_get_prop(DEV(vsec->xdev), pdata->xsp_dtb, XRT_MD_NODE_VSEC,
+ NULL, XRT_MD_PROP_OFFSET, (const void **)&bar_off, NULL);
+ if (ret) {
+ xrt_err(vsec->xdev, "failed to get bar off, ret %d", ret);
+ return -EINVAL;
+ }
+
+ xrt_info(vsec->xdev, "Map vsec at bar %d, offset 0x%llx",
+ be32_to_cpu(*bar), be64_to_cpu(*bar_off));
+
+ xleaf_get_root_res(vsec->xdev, be32_to_cpu(*bar), &res);
+ if (!res) {
+ xrt_err(vsec->xdev, "failed to get bar addr");
+ return -EINVAL;
+ }
+
+ addr = res->start + be64_to_cpu(*bar_off);
+
+ base = devm_ioremap(&vsec->xdev->dev, addr, vsec_regmap_config.max_register);
+ if (!base) {
+ xrt_err(vsec->xdev, "Map failed");
+ return -EIO;
+ }
+
+ vsec->regmap = devm_regmap_init_mmio(&vsec->xdev->dev, base, &vsec_regmap_config);
+ if (IS_ERR(vsec->regmap)) {
+ xrt_err(vsec->xdev, "regmap %pR failed", res);
+ return PTR_ERR(vsec->regmap);
+ }
+
+ ret = regmap_read(vsec->regmap, VSEC_REG_LENGTH, &vsec->length);
+ if (ret) {
+ xrt_err(vsec->xdev, "failed to read length %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void xrt_vsec_remove(struct xrt_device *xdev)
+{
+ struct xrt_vsec *vsec;
+
+ vsec = xrt_get_drvdata(xdev);
+
+ if (vsec->group >= 0)
+ xleaf_destroy_group(xdev, vsec->group);
+ vfree(vsec->metadata);
+}
+
+static int xrt_vsec_probe(struct xrt_device *xdev)
+{
+ struct xrt_vsec *vsec;
+ int ret = 0;
+
+ vsec = devm_kzalloc(&xdev->dev, sizeof(*vsec), GFP_KERNEL);
+ if (!vsec)
+ return -ENOMEM;
+
+ vsec->xdev = xdev;
+ vsec->group = -1;
+ xrt_set_drvdata(xdev, vsec);
+
+ ret = xrt_vsec_mapio(vsec);
+ if (ret)
+ goto failed;
+
+ ret = xrt_vsec_create_metadata(vsec);
+ if (ret) {
+ xrt_err(xdev, "create metadata failed, ret %d", ret);
+ goto failed;
+ }
+ ret = xleaf_create_group(xdev, vsec->metadata);
+ if (ret < 0) {
+ xrt_err(xdev, "create group failed, ret %d", vsec->group);
+ goto failed;
+ }
+ vsec->group = ret;
+
+ return 0;
+
+failed:
+ xrt_vsec_remove(xdev);
+
+ return ret;
+}
+
+static struct xrt_dev_endpoints xrt_vsec_endpoints[] = {
+ {
+ .xse_names = (struct xrt_dev_ep_names []){
+ { .ep_name = XRT_MD_NODE_VSEC },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_driver xrt_vsec_driver = {
+ .driver = {
+ .name = XRT_VSEC,
+ },
+ .subdev_id = XRT_SUBDEV_VSEC,
+ .endpoints = xrt_vsec_endpoints,
+ .probe = xrt_vsec_probe,
+ .remove = xrt_vsec_remove,
+ .leaf_call = xrt_vsec_leaf_call,
+};
+
+XRT_LEAF_INIT_FINI_FUNC(vsec);
--
2.27.0