drivers/gpu/drm/i915/i915_getparam.c
Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/i915_getparam.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpu/drm/i915/i915_getparam.c- Extension
.c- Size
- 5939 bytes
- Lines
- 211
- 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.
- 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.
- Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
drm/drm_print.hdisplay/intel_overlay.hgem/i915_gem_mman.hgt/intel_engine_user.hpxp/intel_pxp.hi915_cmd_parser.hi915_drv.hi915_getparam.hi915_perf.h
Detected Declarations
function i915_getparam_ioctl
Annotated Snippet
#include <drm/drm_print.h>
#include "display/intel_overlay.h"
#include "gem/i915_gem_mman.h"
#include "gt/intel_engine_user.h"
#include "pxp/intel_pxp.h"
#include "i915_cmd_parser.h"
#include "i915_drv.h"
#include "i915_getparam.h"
#include "i915_perf.h"
int i915_getparam_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_i915_private *i915 = to_i915(dev);
struct intel_display *display = i915->display;
struct pci_dev *pdev = to_pci_dev(dev->dev);
const struct sseu_dev_info *sseu = &to_gt(i915)->info.sseu;
drm_i915_getparam_t *param = data;
int value = 0;
switch (param->param) {
case I915_PARAM_IRQ_ACTIVE:
case I915_PARAM_ALLOW_BATCHBUFFER:
case I915_PARAM_LAST_DISPATCH:
case I915_PARAM_HAS_EXEC_CONSTANTS:
/* Reject all old ums/dri params. */
return -ENODEV;
case I915_PARAM_CHIPSET_ID:
value = pdev->device;
break;
case I915_PARAM_REVISION:
value = pdev->revision;
break;
case I915_PARAM_NUM_FENCES_AVAIL:
value = to_gt(i915)->ggtt->num_fences;
break;
case I915_PARAM_HAS_OVERLAY:
value = intel_overlay_available(display);
break;
case I915_PARAM_HAS_BSD:
value = !!intel_engine_lookup_user(i915,
I915_ENGINE_CLASS_VIDEO, 0);
break;
case I915_PARAM_HAS_BLT:
value = !!intel_engine_lookup_user(i915,
I915_ENGINE_CLASS_COPY, 0);
break;
case I915_PARAM_HAS_VEBOX:
value = !!intel_engine_lookup_user(i915,
I915_ENGINE_CLASS_VIDEO_ENHANCE, 0);
break;
case I915_PARAM_HAS_BSD2:
value = !!intel_engine_lookup_user(i915,
I915_ENGINE_CLASS_VIDEO, 1);
break;
case I915_PARAM_HAS_LLC:
value = HAS_LLC(i915);
break;
case I915_PARAM_HAS_WT:
value = HAS_WT(i915);
break;
case I915_PARAM_HAS_ALIASING_PPGTT:
value = INTEL_PPGTT(i915);
break;
case I915_PARAM_HAS_SEMAPHORES:
value = !!(i915->caps.scheduler & I915_SCHEDULER_CAP_SEMAPHORES);
break;
case I915_PARAM_HAS_SECURE_BATCHES:
value = HAS_SECURE_BATCHES(i915) && capable(CAP_SYS_ADMIN);
break;
case I915_PARAM_CMD_PARSER_VERSION:
value = i915_cmd_parser_get_version(i915);
break;
case I915_PARAM_SUBSLICE_TOTAL:
value = intel_sseu_subslice_total(sseu);
if (!value)
return -ENODEV;
break;
case I915_PARAM_EU_TOTAL:
value = sseu->eu_total;
if (!value)
return -ENODEV;
break;
case I915_PARAM_HAS_GPU_RESET:
value = i915->params.enable_hangcheck &&
intel_has_gpu_reset(to_gt(i915));
if (value && intel_has_reset_engine(to_gt(i915)))
value = 2;
Annotation
- Immediate include surface: `drm/drm_print.h`, `display/intel_overlay.h`, `gem/i915_gem_mman.h`, `gt/intel_engine_user.h`, `pxp/intel_pxp.h`, `i915_cmd_parser.h`, `i915_drv.h`, `i915_getparam.h`.
- Detected declarations: `function i915_getparam_ioctl`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
- This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.