Setup new I915_GETPARAM ioctl entries for subslice total and EU total. Userspace drivers need these values when constructing GPGPU commands. This kernel query method is intended to replace the PCI ID-based tables that userspace drivers currently maintain. The kernel driver can employ fuse register reads as needed to ensure the most accurate determination of GT config attributes. This first became important with Cherryview in which the config could differ between devices with the same PCI ID. The kernel detection of these values is device-specific and not included in this patch. Because zero is not a valid value for any of these parameters, a value of zero is interpreted as unknown for the device. Userspace drivers should continue to maintain ID-based tables for older devices not supported by the new query method. v2: Increment our I915_GETPARAM indices to fit after REVISION which was merged ahead of us.
Unified · Split
| @@ -153,6 +153,16 @@ static int i915_getparam(struct drm_device *dev, void *data, · 152 unmodified lines | ||
| 153 | 153 | case I915_PARAM_MMAP_VERSION: |
| 154 | 154 | value = 1; |
| 155 | 155 | break; |
| 156 | + case I915_PARAM_SUBSLICE_TOTAL: | |
| 157 | + value = INTEL_INFO(dev)->subslice_total; | |
| 158 | + if (!value) | |
| 159 | + return -ENODEV; | |
| 160 | + break; | |
| 161 | + case I915_PARAM_EU_TOTAL: | |
| 162 | + value = INTEL_INFO(dev)->eu_total; | |
| 163 | + if (!value) | |
| 164 | + return -ENODEV; | |
| 165 | + break; | |
| 156 | 166 | default: |
| 157 | 167 | DRM_DEBUG("Unknown parameter %d\n", param->param); |
| 158 | 168 | return -EINVAL; |
| @@ -348,6 +348,8 @@ typedef struct drm_i915_irq_wait { · 347 unmodified lines | ||
| 348 | 348 | #define I915_PARAM_MMAP_VERSION 30 |
| 349 | 349 | #define I915_PARAM_HAS_BSD2 31 |
| 350 | 350 | #define I915_PARAM_REVISION 32 |
| 351 | +#define I915_PARAM_SUBSLICE_TOTAL 33 | |
| 352 | +#define I915_PARAM_EU_TOTAL 34 | |
| 351 | 353 | |
| 352 | 354 | typedef struct drm_i915_getparam { |
| 353 | 355 | int param; |