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path: root/drivers/usb/host/xhci-debugfs.c
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Diffstat (limited to 'drivers/usb/host/xhci-debugfs.c')
-rw-r--r--drivers/usb/host/xhci-debugfs.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c
new file mode 100644
index 000000000000..6772ee90944b
--- /dev/null
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -0,0 +1,526 @@
+/*
+ * xhci-debugfs.c - xHCI debugfs interface
+ *
+ * Copyright (C) 2017 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/slab.h>
+
+#include "xhci.h"
+#include "xhci-debugfs.h"
+
+static const struct debugfs_reg32 xhci_cap_regs[] = {
+ dump_register(CAPLENGTH),
+ dump_register(HCSPARAMS1),
+ dump_register(HCSPARAMS2),
+ dump_register(HCSPARAMS3),
+ dump_register(HCCPARAMS1),
+ dump_register(DOORBELLOFF),
+ dump_register(RUNTIMEOFF),
+ dump_register(HCCPARAMS2),
+};
+
+static const struct debugfs_reg32 xhci_op_regs[] = {
+ dump_register(USBCMD),
+ dump_register(USBSTS),
+ dump_register(PAGESIZE),
+ dump_register(DNCTRL),
+ dump_register(CRCR),
+ dump_register(DCBAAP_LOW),
+ dump_register(DCBAAP_HIGH),
+ dump_register(CONFIG),
+};
+
+static const struct debugfs_reg32 xhci_runtime_regs[] = {
+ dump_register(MFINDEX),
+ dump_register(IR0_IMAN),
+ dump_register(IR0_IMOD),
+ dump_register(IR0_ERSTSZ),
+ dump_register(IR0_ERSTBA_LOW),
+ dump_register(IR0_ERSTBA_HIGH),
+ dump_register(IR0_ERDP_LOW),
+ dump_register(IR0_ERDP_HIGH),
+};
+
+static const struct debugfs_reg32 xhci_extcap_legsup[] = {
+ dump_register(EXTCAP_USBLEGSUP),
+ dump_register(EXTCAP_USBLEGCTLSTS),
+};
+
+static const struct debugfs_reg32 xhci_extcap_protocol[] = {
+ dump_register(EXTCAP_REVISION),
+ dump_register(EXTCAP_NAME),
+ dump_register(EXTCAP_PORTINFO),
+ dump_register(EXTCAP_PORTTYPE),
+ dump_register(EXTCAP_MANTISSA1),
+ dump_register(EXTCAP_MANTISSA2),
+ dump_register(EXTCAP_MANTISSA3),
+ dump_register(EXTCAP_MANTISSA4),
+ dump_register(EXTCAP_MANTISSA5),
+ dump_register(EXTCAP_MANTISSA6),
+};
+
+static const struct debugfs_reg32 xhci_extcap_dbc[] = {
+ dump_register(EXTCAP_DBC_CAPABILITY),
+ dump_register(EXTCAP_DBC_DOORBELL),
+ dump_register(EXTCAP_DBC_ERSTSIZE),
+ dump_register(EXTCAP_DBC_ERST_LOW),
+ dump_register(EXTCAP_DBC_ERST_HIGH),
+ dump_register(EXTCAP_DBC_ERDP_LOW),
+ dump_register(EXTCAP_DBC_ERDP_HIGH),
+ dump_register(EXTCAP_DBC_CONTROL),
+ dump_register(EXTCAP_DBC_STATUS),
+ dump_register(EXTCAP_DBC_PORTSC),
+ dump_register(EXTCAP_DBC_CONT_LOW),
+ dump_register(EXTCAP_DBC_CONT_HIGH),
+ dump_register(EXTCAP_DBC_DEVINFO1),
+ dump_register(EXTCAP_DBC_DEVINFO2),
+};
+
+static struct dentry *xhci_debugfs_root;
+
+static struct xhci_regset *xhci_debugfs_alloc_regset(struct xhci_hcd *xhci)
+{
+ struct xhci_regset *regset;
+
+ regset = kzalloc(sizeof(*regset), GFP_KERNEL);
+ if (!regset)
+ return NULL;
+
+ /*
+ * The allocation and free of regset are executed in order.
+ * We needn't a lock here.
+ */
+ INIT_LIST_HEAD(&regset->list);
+ list_add_tail(&regset->list, &xhci->regset_list);
+
+ return regset;
+}
+
+static void xhci_debugfs_free_regset(struct xhci_regset *regset)
+{
+ if (!regset)
+ return;
+
+ list_del(&regset->list);
+ kfree(regset);
+}
+
+static void xhci_debugfs_regset(struct xhci_hcd *xhci, u32 base,
+ const struct debugfs_reg32 *regs,
+ size_t nregs, struct dentry *parent,
+ const char *fmt, ...)
+{
+ struct xhci_regset *rgs;
+ va_list args;
+ struct debugfs_regset32 *regset;
+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
+
+ rgs = xhci_debugfs_alloc_regset(xhci);
+ if (!rgs)
+ return;
+
+ va_start(args, fmt);
+ vsnprintf(rgs->name, sizeof(rgs->name), fmt, args);
+ va_end(args);
+
+ regset = &rgs->regset;
+ regset->regs = regs;
+ regset->nregs = nregs;
+ regset->base = hcd->regs + base;
+
+ debugfs_create_regset32((const char *)rgs->name, 0444, parent, regset);
+}
+
+static void xhci_debugfs_extcap_regset(struct xhci_hcd *xhci, int cap_id,
+ const struct debugfs_reg32 *regs,
+ size_t n, const char *cap_name)
+{
+ u32 offset;
+ int index = 0;
+ size_t psic, nregs = n;
+ void __iomem *base = &xhci->cap_regs->hc_capbase;
+
+ offset = xhci_find_next_ext_cap(base, 0, cap_id);
+ while (offset) {
+ if (cap_id == XHCI_EXT_CAPS_PROTOCOL) {
+ psic = XHCI_EXT_PORT_PSIC(readl(base + offset + 8));
+ nregs = min(4 + psic, n);
+ }
+
+ xhci_debugfs_regset(xhci, offset, regs, nregs,
+ xhci->debugfs_root, "%s:%02d",
+ cap_name, index);
+ offset = xhci_find_next_ext_cap(base, offset, cap_id);
+ index++;
+ }
+}
+
+static int xhci_ring_enqueue_show(struct seq_file *s, void *unused)
+{
+ dma_addr_t dma;
+ struct xhci_ring *ring = s->private;
+
+ dma = xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
+ seq_printf(s, "%pad\n", &dma);
+
+ return 0;
+}
+
+static int xhci_ring_dequeue_show(struct seq_file *s, void *unused)
+{
+ dma_addr_t dma;
+ struct xhci_ring *ring = s->private;
+
+ dma = xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
+ seq_printf(s, "%pad\n", &dma);
+
+ return 0;
+}
+
+static int xhci_ring_cycle_show(struct seq_file *s, void *unused)
+{
+ struct xhci_ring *ring = s->private;
+
+ seq_printf(s, "%d\n", ring->cycle_state);
+
+ return 0;
+}
+
+static void xhci_ring_dump_segment(struct seq_file *s,
+ struct xhci_segment *seg)
+{
+ int i;
+ dma_addr_t dma;
+ union xhci_trb *trb;
+
+ for (i = 0; i < TRBS_PER_SEGMENT; i++) {
+ trb = &seg->trbs[i];
+ dma = seg->dma + i * sizeof(*trb);
+ seq_printf(s, "%pad: %s\n", &dma,
+ xhci_decode_trb(trb->generic.field[0],
+ trb->generic.field[1],
+ trb->generic.field[2],
+ trb->generic.field[3]));
+ }
+}
+
+static int xhci_ring_trb_show(struct seq_file *s, void *unused)
+{
+ int i;
+ struct xhci_ring *ring = s->private;
+ struct xhci_segment *seg = ring->first_seg;
+
+ for (i = 0; i < ring->num_segs; i++) {
+ xhci_ring_dump_segment(s, seg);
+ seg = seg->next;
+ }
+
+ return 0;
+}
+
+static struct xhci_file_map ring_files[] = {
+ {"enqueue", xhci_ring_enqueue_show, },
+ {"dequeue", xhci_ring_dequeue_show, },
+ {"cycle", xhci_ring_cycle_show, },
+ {"trbs", xhci_ring_trb_show, },
+};
+
+static int xhci_ring_open(struct inode *inode, struct file *file)
+{
+ int i;
+ struct xhci_file_map *f_map;
+ const char *file_name = file_dentry(file)->d_iname;
+
+ for (i = 0; i < ARRAY_SIZE(ring_files); i++) {
+ f_map = &ring_files[i];
+
+ if (strcmp(f_map->name, file_name) == 0)
+ break;
+ }
+
+ return single_open(file, f_map->show, inode->i_private);
+}
+
+static const struct file_operations xhci_ring_fops = {
+ .open = xhci_ring_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int xhci_slot_context_show(struct seq_file *s, void *unused)
+{
+ struct xhci_hcd *xhci;
+ struct xhci_slot_ctx *slot_ctx;
+ struct xhci_slot_priv *priv = s->private;
+ struct xhci_virt_device *dev = priv->dev;
+
+ xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
+ slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
+ seq_printf(s, "%pad: %s\n", &dev->out_ctx->dma,
+ xhci_decode_slot_context(slot_ctx->dev_info,
+ slot_ctx->dev_info2,
+ slot_ctx->tt_info,
+ slot_ctx->dev_state));
+
+ return 0;
+}
+
+static int xhci_endpoint_context_show(struct seq_file *s, void *unused)
+{
+ int dci;
+ dma_addr_t dma;
+ struct xhci_hcd *xhci;
+ struct xhci_ep_ctx *ep_ctx;
+ struct xhci_slot_priv *priv = s->private;
+ struct xhci_virt_device *dev = priv->dev;
+
+ xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
+
+ for (dci = 1; dci < 32; dci++) {
+ ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, dci);
+ dma = dev->out_ctx->dma + dci * CTX_SIZE(xhci->hcc_params);
+ seq_printf(s, "%pad: %s\n", &dma,
+ xhci_decode_ep_context(ep_ctx->ep_info,
+ ep_ctx->ep_info2,
+ ep_ctx->deq,
+ ep_ctx->tx_info));
+ }
+
+ return 0;
+}
+
+static int xhci_device_name_show(struct seq_file *s, void *unused)
+{
+ struct xhci_slot_priv *priv = s->private;
+ struct xhci_virt_device *dev = priv->dev;
+
+ seq_printf(s, "%s\n", dev_name(&dev->udev->dev));
+
+ return 0;
+}
+
+static struct xhci_file_map context_files[] = {
+ {"name", xhci_device_name_show, },
+ {"slot-context", xhci_slot_context_show, },
+ {"ep-context", xhci_endpoint_context_show, },
+};
+
+static int xhci_context_open(struct inode *inode, struct file *file)
+{
+ int i;
+ struct xhci_file_map *f_map;
+ const char *file_name = file_dentry(file)->d_iname;
+
+ for (i = 0; i < ARRAY_SIZE(context_files); i++) {
+ f_map = &context_files[i];
+
+ if (strcmp(f_map->name, file_name) == 0)
+ break;
+ }
+
+ return single_open(file, f_map->show, inode->i_private);
+}
+
+static const struct file_operations xhci_context_fops = {
+ .open = xhci_context_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void xhci_debugfs_create_files(struct xhci_hcd *xhci,
+ struct xhci_file_map *files,
+ size_t nentries, void *data,
+ struct dentry *parent,
+ const struct file_operations *fops)
+{
+ int i;
+
+ for (i = 0; i < nentries; i++)
+ debugfs_create_file(files[i].name, 0444, parent, data, fops);
+}
+
+static struct dentry *xhci_debugfs_create_ring_dir(struct xhci_hcd *xhci,
+ struct xhci_ring *ring,
+ const char *name,
+ struct dentry *parent)
+{
+ struct dentry *dir;
+
+ dir = debugfs_create_dir(name, parent);
+ xhci_debugfs_create_files(xhci, ring_files, ARRAY_SIZE(ring_files),
+ ring, dir, &xhci_ring_fops);
+
+ return dir;
+}
+
+static void xhci_debugfs_create_context_files(struct xhci_hcd *xhci,
+ struct dentry *parent,
+ int slot_id)
+{
+ struct xhci_virt_device *dev = xhci->devs[slot_id];
+
+ xhci_debugfs_create_files(xhci, context_files,
+ ARRAY_SIZE(context_files),
+ dev->debugfs_private,
+ parent, &xhci_context_fops);
+}
+
+void xhci_debugfs_create_endpoint(struct xhci_hcd *xhci,
+ struct xhci_virt_device *dev,
+ int ep_index)
+{
+ struct xhci_ep_priv *epriv;
+ struct xhci_slot_priv *spriv = dev->debugfs_private;
+
+ if (spriv->eps[ep_index])
+ return;
+
+ epriv = kzalloc(sizeof(*epriv), GFP_KERNEL);
+ if (!epriv)
+ return;
+
+ snprintf(epriv->name, sizeof(epriv->name), "ep%02d", ep_index);
+ epriv->root = xhci_debugfs_create_ring_dir(xhci,
+ dev->eps[ep_index].new_ring,
+ epriv->name,
+ spriv->root);
+ spriv->eps[ep_index] = epriv;
+}
+
+void xhci_debugfs_remove_endpoint(struct xhci_hcd *xhci,
+ struct xhci_virt_device *dev,
+ int ep_index)
+{
+ struct xhci_ep_priv *epriv;
+ struct xhci_slot_priv *spriv = dev->debugfs_private;
+
+ if (!spriv || !spriv->eps[ep_index])
+ return;
+
+ epriv = spriv->eps[ep_index];
+ debugfs_remove_recursive(epriv->root);
+ spriv->eps[ep_index] = NULL;
+ kfree(epriv);
+}
+
+void xhci_debugfs_create_slot(struct xhci_hcd *xhci, int slot_id)
+{
+ struct xhci_slot_priv *priv;
+ struct xhci_virt_device *dev = xhci->devs[slot_id];
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return;
+
+ snprintf(priv->name, sizeof(priv->name), "%02d", slot_id);
+ priv->root = debugfs_create_dir(priv->name, xhci->debugfs_slots);
+ priv->dev = dev;
+ dev->debugfs_private = priv;
+
+ xhci_debugfs_create_ring_dir(xhci, dev->eps[0].ring,
+ "ep00", priv->root);
+
+ xhci_debugfs_create_context_files(xhci, priv->root, slot_id);
+}
+
+void xhci_debugfs_remove_slot(struct xhci_hcd *xhci, int slot_id)
+{
+ int i;
+ struct xhci_slot_priv *priv;
+ struct xhci_virt_device *dev = xhci->devs[slot_id];
+
+ if (!dev || !dev->debugfs_private)
+ return;
+
+ priv = dev->debugfs_private;
+
+ debugfs_remove_recursive(priv->root);
+
+ for (i = 0; i < 31; i++)
+ kfree(priv->eps[i]);
+
+ kfree(priv);
+ dev->debugfs_private = NULL;
+}
+
+void xhci_debugfs_init(struct xhci_hcd *xhci)
+{
+ struct device *dev = xhci_to_hcd(xhci)->self.controller;
+
+ xhci->debugfs_root = debugfs_create_dir(dev_name(dev),
+ xhci_debugfs_root);
+
+ INIT_LIST_HEAD(&xhci->regset_list);
+
+ xhci_debugfs_regset(xhci,
+ 0,
+ xhci_cap_regs, ARRAY_SIZE(xhci_cap_regs),
+ xhci->debugfs_root, "reg-cap");
+
+ xhci_debugfs_regset(xhci,
+ HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)),
+ xhci_op_regs, ARRAY_SIZE(xhci_op_regs),
+ xhci->debugfs_root, "reg-op");
+
+ xhci_debugfs_regset(xhci,
+ readl(&xhci->cap_regs->run_regs_off) & RTSOFF_MASK,
+ xhci_runtime_regs, ARRAY_SIZE(xhci_runtime_regs),
+ xhci->debugfs_root, "reg-runtime");
+
+ xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_LEGACY,
+ xhci_extcap_legsup,
+ ARRAY_SIZE(xhci_extcap_legsup),
+ "reg-ext-legsup");
+
+ xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_PROTOCOL,
+ xhci_extcap_protocol,
+ ARRAY_SIZE(xhci_extcap_protocol),
+ "reg-ext-protocol");
+
+ xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_DEBUG,
+ xhci_extcap_dbc,
+ ARRAY_SIZE(xhci_extcap_dbc),
+ "reg-ext-dbc");
+
+ xhci_debugfs_create_ring_dir(xhci, xhci->cmd_ring,
+ "command-ring",
+ xhci->debugfs_root);
+
+ xhci_debugfs_create_ring_dir(xhci, xhci->event_ring,
+ "event-ring",
+ xhci->debugfs_root);
+
+ xhci->debugfs_slots = debugfs_create_dir("devices", xhci->debugfs_root);
+}
+
+void xhci_debugfs_exit(struct xhci_hcd *xhci)
+{
+ struct xhci_regset *rgs, *tmp;
+
+ debugfs_remove_recursive(xhci->debugfs_root);
+ xhci->debugfs_root = NULL;
+ xhci->debugfs_slots = NULL;
+
+ list_for_each_entry_safe(rgs, tmp, &xhci->regset_list, list)
+ xhci_debugfs_free_regset(rgs);
+}
+
+void __init xhci_debugfs_create_root(void)
+{
+ xhci_debugfs_root = debugfs_create_dir("xhci", usb_debug_root);
+}
+
+void __exit xhci_debugfs_remove_root(void)
+{
+ debugfs_remove_recursive(xhci_debugfs_root);
+ xhci_debugfs_root = NULL;
+}