mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 15:15:15 +07:00
817cc07918
We can implement limited RC6 counter wrap-around protection under the assumption that clients will be reading this value more frequently than the wrap period on a given platform. With the typical wrap-around period being ~90 minutes, even with the exception of Baytrail which wraps every 13 seconds, this sounds like a reasonable assumption. Implementation works by storing a 64-bit software copy of a hardware RC6 counter, along with the previous HW counter snapshot. This enables it to detect wrap is polled frequently enough and keep the software copy monotonically incrementing. v2: * Missed GEN6_GT_GFX_RC6_LOCKED when considering slot sizing and indexing. * Fixed off-by-one in wrap-around handling. (Chris Wilson) v3: * Simplify index checking by using unsigned int. (Chris Wilson) * Expand the comment to explain why indexing works. v4: * Use __int128 if supported. v5: * Use mul_u64_u32_div. (Chris Wilson) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94852 Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> # v3 Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180208160036.29919-1-tvrtko.ursulin@linux.intel.com Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com> |
||
|---|---|---|
| .. | ||
| amd | ||
| arc | ||
| arm | ||
| armada | ||
| ast | ||
| atmel-hlcdc | ||
| bochs | ||
| bridge | ||
| cirrus | ||
| etnaviv | ||
| exynos | ||
| fsl-dcu | ||
| gma500 | ||
| hisilicon | ||
| i2c | ||
| i810 | ||
| i915 | ||
| imx | ||
| lib | ||
| mediatek | ||
| meson | ||
| mga | ||
| mgag200 | ||
| msm | ||
| mxsfb | ||
| nouveau | ||
| omapdrm | ||
| panel | ||
| pl111 | ||
| qxl | ||
| r128 | ||
| radeon | ||
| rcar-du | ||
| rockchip | ||
| savage | ||
| scheduler | ||
| selftests | ||
| shmobile | ||
| sis | ||
| sti | ||
| stm | ||
| sun4i | ||
| tdfx | ||
| tegra | ||
| tilcdc | ||
| tinydrm | ||
| ttm | ||
| tve200 | ||
| udl | ||
| vc4 | ||
| vgem | ||
| via | ||
| virtio | ||
| vmwgfx | ||
| zte | ||
| ati_pcigart.c | ||
| drm_agpsupport.c | ||
| drm_atomic_helper.c | ||
| drm_atomic.c | ||
| drm_auth.c | ||
| drm_blend.c | ||
| drm_bridge.c | ||
| drm_bufs.c | ||
| drm_cache.c | ||
| drm_color_mgmt.c | ||
| drm_connector.c | ||
| drm_context.c | ||
| drm_crtc_helper_internal.h | ||
| drm_crtc_helper.c | ||
| drm_crtc_internal.h | ||
| drm_crtc.c | ||
| drm_debugfs_crc.c | ||
| drm_debugfs.c | ||
| drm_dma.c | ||
| drm_dp_aux_dev.c | ||
| drm_dp_dual_mode_helper.c | ||
| drm_dp_helper.c | ||
| drm_dp_mst_topology.c | ||
| drm_drv.c | ||
| drm_dumb_buffers.c | ||
| drm_edid_load.c | ||
| drm_edid.c | ||
| drm_encoder_slave.c | ||
| drm_encoder.c | ||
| drm_fb_cma_helper.c | ||
| drm_fb_helper.c | ||
| drm_file.c | ||
| drm_flip_work.c | ||
| drm_fourcc.c | ||
| drm_framebuffer.c | ||
| drm_gem_cma_helper.c | ||
| drm_gem_framebuffer_helper.c | ||
| drm_gem.c | ||
| drm_global.c | ||
| drm_hashtab.c | ||
| drm_info.c | ||
| drm_internal.h | ||
| drm_ioc32.c | ||
| drm_ioctl.c | ||
| drm_irq.c | ||
| drm_kms_helper_common.c | ||
| drm_lease.c | ||
| drm_legacy.h | ||
| drm_lock.c | ||
| drm_memory.c | ||
| drm_mipi_dsi.c | ||
| drm_mm.c | ||
| drm_mode_config.c | ||
| drm_mode_object.c | ||
| drm_modes.c | ||
| drm_modeset_helper.c | ||
| drm_modeset_lock.c | ||
| drm_of.c | ||
| drm_panel_orientation_quirks.c | ||
| drm_panel.c | ||
| drm_pci.c | ||
| drm_plane_helper.c | ||
| drm_plane.c | ||
| drm_prime.c | ||
| drm_print.c | ||
| drm_probe_helper.c | ||
| drm_property.c | ||
| drm_rect.c | ||
| drm_scatter.c | ||
| drm_scdc_helper.c | ||
| drm_simple_kms_helper.c | ||
| drm_syncobj.c | ||
| drm_sysfs.c | ||
| drm_trace_points.c | ||
| drm_trace.h | ||
| drm_vblank.c | ||
| drm_vm.c | ||
| drm_vma_manager.c | ||
| Kconfig | ||
| Makefile | ||