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path: root/drivers/pci/pcie/ptm.c
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Diffstat (limited to 'drivers/pci/pcie/ptm.c')
-rw-r--r--drivers/pci/pcie/ptm.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index 7cfb6c0d5dcb..4bd73f038ffb 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -5,6 +5,7 @@
*/
#include <linux/bitfield.h>
+#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
@@ -252,3 +253,304 @@ bool pcie_ptm_enabled(struct pci_dev *dev)
return dev->ptm_enabled;
}
EXPORT_SYMBOL(pcie_ptm_enabled);
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static ssize_t context_update_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = file->private_data;
+ char buf[7];
+ int ret;
+ u8 mode;
+
+ if (!ptm_debugfs->ops->context_update_write)
+ return -EOPNOTSUPP;
+
+ if (count < 1 || count >= sizeof(buf))
+ return -EINVAL;
+
+ ret = copy_from_user(buf, ubuf, count);
+ if (ret)
+ return -EFAULT;
+
+ buf[count] = '\0';
+
+ if (sysfs_streq(buf, "auto"))
+ mode = PCIE_PTM_CONTEXT_UPDATE_AUTO;
+ else if (sysfs_streq(buf, "manual"))
+ mode = PCIE_PTM_CONTEXT_UPDATE_MANUAL;
+ else
+ return -EINVAL;
+
+ mutex_lock(&ptm_debugfs->lock);
+ ret = ptm_debugfs->ops->context_update_write(ptm_debugfs->pdata, mode);
+ mutex_unlock(&ptm_debugfs->lock);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t context_update_read(struct file *file, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = file->private_data;
+ char buf[8]; /* Extra space for NULL termination at the end */
+ ssize_t pos;
+ u8 mode;
+
+ if (!ptm_debugfs->ops->context_update_read)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&ptm_debugfs->lock);
+ ptm_debugfs->ops->context_update_read(ptm_debugfs->pdata, &mode);
+ mutex_unlock(&ptm_debugfs->lock);
+
+ if (mode == PCIE_PTM_CONTEXT_UPDATE_AUTO)
+ pos = scnprintf(buf, sizeof(buf), "auto\n");
+ else
+ pos = scnprintf(buf, sizeof(buf), "manual\n");
+
+ return simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+}
+
+static const struct file_operations context_update_fops = {
+ .open = simple_open,
+ .read = context_update_read,
+ .write = context_update_write,
+};
+
+static int context_valid_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ bool valid;
+ int ret;
+
+ if (!ptm_debugfs->ops->context_valid_read)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&ptm_debugfs->lock);
+ ret = ptm_debugfs->ops->context_valid_read(ptm_debugfs->pdata, &valid);
+ mutex_unlock(&ptm_debugfs->lock);
+ if (ret)
+ return ret;
+
+ *val = valid;
+
+ return 0;
+}
+
+static int context_valid_set(void *data, u64 val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ int ret;
+
+ if (!ptm_debugfs->ops->context_valid_write)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&ptm_debugfs->lock);
+ ret = ptm_debugfs->ops->context_valid_write(ptm_debugfs->pdata, !!val);
+ mutex_unlock(&ptm_debugfs->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(context_valid_fops, context_valid_get,
+ context_valid_set, "%llu\n");
+
+static int local_clock_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->local_clock_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->local_clock_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(local_clock_fops, local_clock_get, NULL, "%llu\n");
+
+static int master_clock_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->master_clock_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->master_clock_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(master_clock_fops, master_clock_get, NULL, "%llu\n");
+
+static int t1_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->t1_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->t1_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(t1_fops, t1_get, NULL, "%llu\n");
+
+static int t2_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->t2_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->t2_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(t2_fops, t2_get, NULL, "%llu\n");
+
+static int t3_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->t3_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->t3_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(t3_fops, t3_get, NULL, "%llu\n");
+
+static int t4_get(void *data, u64 *val)
+{
+ struct pci_ptm_debugfs *ptm_debugfs = data;
+ u64 clock;
+ int ret;
+
+ if (!ptm_debugfs->ops->t4_read)
+ return -EOPNOTSUPP;
+
+ ret = ptm_debugfs->ops->t4_read(ptm_debugfs->pdata, &clock);
+ if (ret)
+ return ret;
+
+ *val = clock;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(t4_fops, t4_get, NULL, "%llu\n");
+
+#define pcie_ptm_create_debugfs_file(pdata, mode, attr) \
+ do { \
+ if (ops->attr##_visible && ops->attr##_visible(pdata)) \
+ debugfs_create_file(#attr, mode, ptm_debugfs->debugfs, \
+ ptm_debugfs, &attr##_fops); \
+ } while (0)
+
+/*
+ * pcie_ptm_create_debugfs() - Create debugfs entries for the PTM context
+ * @dev: PTM capable component device
+ * @pdata: Private data of the PTM capable component device
+ * @ops: PTM callback structure
+ *
+ * Create debugfs entries for exposing the PTM context of the PTM capable
+ * components such as Root Complex and Endpoint controllers.
+ *
+ * Return: Pointer to 'struct pci_ptm_debugfs' if success, NULL otherwise.
+ */
+struct pci_ptm_debugfs *pcie_ptm_create_debugfs(struct device *dev, void *pdata,
+ const struct pcie_ptm_ops *ops)
+{
+ struct pci_ptm_debugfs *ptm_debugfs;
+ char *dirname;
+ int ret;
+
+ /* Caller must provide check_capability() callback */
+ if (!ops->check_capability)
+ return NULL;
+
+ /* Check for PTM capability before creating debugfs attrbutes */
+ ret = ops->check_capability(pdata);
+ if (!ret) {
+ dev_dbg(dev, "PTM capability not present\n");
+ return NULL;
+ }
+
+ ptm_debugfs = kzalloc(sizeof(*ptm_debugfs), GFP_KERNEL);
+ if (!ptm_debugfs)
+ return NULL;
+
+ dirname = devm_kasprintf(dev, GFP_KERNEL, "pcie_ptm_%s", dev_name(dev));
+ if (!dirname)
+ return NULL;
+
+ ptm_debugfs->debugfs = debugfs_create_dir(dirname, NULL);
+ ptm_debugfs->pdata = pdata;
+ ptm_debugfs->ops = ops;
+ mutex_init(&ptm_debugfs->lock);
+
+ pcie_ptm_create_debugfs_file(pdata, 0644, context_update);
+ pcie_ptm_create_debugfs_file(pdata, 0644, context_valid);
+ pcie_ptm_create_debugfs_file(pdata, 0444, local_clock);
+ pcie_ptm_create_debugfs_file(pdata, 0444, master_clock);
+ pcie_ptm_create_debugfs_file(pdata, 0444, t1);
+ pcie_ptm_create_debugfs_file(pdata, 0444, t2);
+ pcie_ptm_create_debugfs_file(pdata, 0444, t3);
+ pcie_ptm_create_debugfs_file(pdata, 0444, t4);
+
+ return ptm_debugfs;
+}
+EXPORT_SYMBOL_GPL(pcie_ptm_create_debugfs);
+
+/*
+ * pcie_ptm_destroy_debugfs() - Destroy debugfs entries for the PTM context
+ * @ptm_debugfs: Pointer to the PTM debugfs struct
+ */
+void pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs)
+{
+ if (!ptm_debugfs)
+ return;
+
+ mutex_destroy(&ptm_debugfs->lock);
+ debugfs_remove_recursive(ptm_debugfs->debugfs);
+}
+EXPORT_SYMBOL_GPL(pcie_ptm_destroy_debugfs);
+#endif
generated by cgit (git 2.34.1) at 2025-07-11 18:13:59 +0000