diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_display_debugfs_params.c')
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_debugfs_params.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c b/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c new file mode 100644 index 0000000000..b7e68eb624 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2023 Intel Corporation + */ + +#include <linux/kernel.h> + +#include <drm/drm_drv.h> + +#include "intel_display_debugfs_params.h" +#include "i915_drv.h" +#include "intel_display_params.h" + +/* int param */ +static int intel_display_param_int_show(struct seq_file *m, void *data) +{ + int *value = m->private; + + seq_printf(m, "%d\n", *value); + + return 0; +} + +static int intel_display_param_int_open(struct inode *inode, struct file *file) +{ + return single_open(file, intel_display_param_int_show, inode->i_private); +} + +static ssize_t intel_display_param_int_write(struct file *file, + const char __user *ubuf, size_t len, + loff_t *offp) +{ + struct seq_file *m = file->private_data; + int *value = m->private; + int ret; + + ret = kstrtoint_from_user(ubuf, len, 0, value); + if (ret) { + /* support boolean values too */ + bool b; + + ret = kstrtobool_from_user(ubuf, len, &b); + if (!ret) + *value = b; + } + + return ret ?: len; +} + +static const struct file_operations intel_display_param_int_fops = { + .owner = THIS_MODULE, + .open = intel_display_param_int_open, + .read = seq_read, + .write = intel_display_param_int_write, + .llseek = default_llseek, + .release = single_release, +}; + +static const struct file_operations intel_display_param_int_fops_ro = { + .owner = THIS_MODULE, + .open = intel_display_param_int_open, + .read = seq_read, + .llseek = default_llseek, + .release = single_release, +}; + +/* unsigned int param */ +static int intel_display_param_uint_show(struct seq_file *m, void *data) +{ + unsigned int *value = m->private; + + seq_printf(m, "%u\n", *value); + + return 0; +} + +static int intel_display_param_uint_open(struct inode *inode, struct file *file) +{ + return single_open(file, intel_display_param_uint_show, inode->i_private); +} + +static ssize_t intel_display_param_uint_write(struct file *file, + const char __user *ubuf, size_t len, + loff_t *offp) +{ + struct seq_file *m = file->private_data; + unsigned int *value = m->private; + int ret; + + ret = kstrtouint_from_user(ubuf, len, 0, value); + if (ret) { + /* support boolean values too */ + bool b; + + ret = kstrtobool_from_user(ubuf, len, &b); + if (!ret) + *value = b; + } + + return ret ?: len; +} + +static const struct file_operations intel_display_param_uint_fops = { + .owner = THIS_MODULE, + .open = intel_display_param_uint_open, + .read = seq_read, + .write = intel_display_param_uint_write, + .llseek = default_llseek, + .release = single_release, +}; + +static const struct file_operations intel_display_param_uint_fops_ro = { + .owner = THIS_MODULE, + .open = intel_display_param_uint_open, + .read = seq_read, + .llseek = default_llseek, + .release = single_release, +}; + +#define RO(mode) (((mode) & 0222) == 0) + +__maybe_unused static struct dentry * +intel_display_debugfs_create_int(const char *name, umode_t mode, + struct dentry *parent, int *value) +{ + return debugfs_create_file_unsafe(name, mode, parent, value, + RO(mode) ? &intel_display_param_int_fops_ro : + &intel_display_param_int_fops); +} + +__maybe_unused static struct dentry * +intel_display_debugfs_create_uint(const char *name, umode_t mode, + struct dentry *parent, unsigned int *value) +{ + return debugfs_create_file_unsafe(name, mode, parent, value, + RO(mode) ? &intel_display_param_uint_fops_ro : + &intel_display_param_uint_fops); +} + +#define _intel_display_param_create_file(parent, name, mode, valp) \ + do { \ + if (mode) \ + _Generic(valp, \ + bool * : debugfs_create_bool, \ + int * : intel_display_debugfs_create_int, \ + unsigned int * : intel_display_debugfs_create_uint, \ + unsigned long * : debugfs_create_ulong, \ + char ** : debugfs_create_str) \ + (name, mode, parent, valp); \ + } while (0) + +/* add a subdirectory with files for each intel display param */ +void intel_display_debugfs_params(struct drm_i915_private *i915) +{ + struct drm_minor *minor = i915->drm.primary; + struct dentry *dir; + char dirname[16]; + + snprintf(dirname, sizeof(dirname), "%s_params", i915->drm.driver->name); + dir = debugfs_lookup(dirname, minor->debugfs_root); + if (!dir) + dir = debugfs_create_dir(dirname, minor->debugfs_root); + if (IS_ERR(dir)) + return; + + /* + * Note: We could create files for params needing special handling + * here. Set mode in params to 0 to skip the generic create file, or + * just let the generic create file fail silently with -EEXIST. + */ + +#define REGISTER(T, x, unused, mode, ...) _intel_display_param_create_file( \ + dir, #x, mode, &i915->display.params.x); + INTEL_DISPLAY_PARAMS_FOR_EACH(REGISTER); +#undef REGISTER +} |