drivers/gpu/drm/i915/i915_params.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/i915_params.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/i915_params.c
Extension
.c
Size
7027 bytes
Lines
225
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/string_helpers.h>

#include <drm/drm_print.h>

#include "i915_params.h"
#include "i915_drv.h"

DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
			"DRM_UT_CORE",
			"DRM_UT_DRIVER",
			"DRM_UT_KMS",
			"DRM_UT_PRIME",
			"DRM_UT_ATOMIC",
			"DRM_UT_VBL",
			"DRM_UT_STATE",
			"DRM_UT_LEASE",
			"DRM_UT_DP",
			"DRM_UT_DRMRES");

#define i915_param_named(name, T, perm, desc) \
	module_param_named(name, i915_modparams.name, T, perm); \
	MODULE_PARM_DESC(name, desc)
#define i915_param_named_unsafe(name, T, perm, desc) \
	module_param_named_unsafe(name, i915_modparams.name, T, perm); \
	MODULE_PARM_DESC(name, desc)

struct i915_params i915_modparams __read_mostly = {
#define MEMBER(T, member, value, ...) .member = (value),
	I915_PARAMS_FOR_EACH(MEMBER)
#undef MEMBER
};

/*
 * Note: As a rule, keep module parameter sysfs permissions read-only
 * 0400. Runtime changes are only supported through i915 debugfs.
 *
 * For any exceptions requiring write access and runtime changes through module
 * parameter sysfs, prevent debugfs file creation by setting the parameter's
 * debugfs mode to 0.
 */

i915_param_named(modeset, int, 0400,
	"Deprecated. Use the 'nomodeset' kernel parameter instead.");

i915_param_named_unsafe(reset, uint, 0400,
	"Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");

#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
i915_param_named(error_capture, bool, 0400,
	"Record the GPU state following a hang. "
	"This information in /sys/class/drm/card<N>/error is vital for "
	"triaging and debugging hangs.");
#endif

i915_param_named_unsafe(enable_hangcheck, bool, 0400,
	"Periodically check GPU activity for detecting hangs. "
	"WARNING: Disabling this can cause system wide hangs. "
	"(default: true)");

i915_param_named_unsafe(force_probe, charp, 0400,
	"Force probe options for specified supported devices. "
	"See CONFIG_DRM_I915_FORCE_PROBE for details.");

i915_param_named(memtest, bool, 0400,
	"Perform a read/write test of all device memory on module load (default: off)");

i915_param_named(mmio_debug, int, 0400,
	"Enable the MMIO debug code for the first N failures (default: off). "
	"This may negatively affect performance.");

i915_param_named_unsafe(enable_guc, int, 0400,
	"Enable GuC load for GuC submission and/or HuC load. "
	"Required functionality can be selected using bitmask values. "
	"(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)");

i915_param_named(guc_log_level, int, 0400,
	"GuC firmware logging level. Requires GuC to be loaded. "
	"(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");

i915_param_named_unsafe(guc_firmware_path, charp, 0400,
	"GuC firmware path to use instead of the default one");

i915_param_named_unsafe(huc_firmware_path, charp, 0400,
	"HuC firmware path to use instead of the default one");

i915_param_named_unsafe(gsc_firmware_path, charp, 0400,
	"GSC firmware path to use instead of the default one");

#if IS_ENABLED(CONFIG_DRM_I915_GVT)
i915_param_named(enable_gvt, bool, 0400,

Annotation

Implementation Notes