diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_uncore.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_uncore.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 6c25c9e7090a..6a4006d25949 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -2702,6 +2702,59 @@ void intel_uncore_prune_engine_fw_domains(struct intel_uncore *uncore, } } +/* + * The driver-initiated FLR is the highest level of reset that we can trigger + * from within the driver. It is different from the PCI FLR in that it doesn't + * fully reset the SGUnit and doesn't modify the PCI config space and therefore + * it doesn't require a re-enumeration of the PCI BARs. However, the + * driver-initiated FLR does still cause a reset of both GT and display and a + * memory wipe of local and stolen memory, so recovery would require a full HW + * re-init and saving/restoring (or re-populating) the wiped memory. Since we + * perform the FLR as the very last action before releasing access to the HW + * during the driver release flow, we don't attempt recovery at all, because + * if/when a new instance of i915 is bound to the device it will do a full + * re-init anyway. + */ +static void driver_initiated_flr(struct intel_uncore *uncore) +{ + struct drm_i915_private *i915 = uncore->i915; + const unsigned int flr_timeout_ms = 3000; /* specs recommend a 3s wait */ + int ret; + + drm_dbg(&i915->drm, "Triggering Driver-FLR\n"); + + /* + * Make sure any pending FLR requests have cleared by waiting for the + * FLR trigger bit to go to zero. Also clear GU_DEBUG's DRIVERFLR_STATUS + * to make sure it's not still set from a prior attempt (it's a write to + * clear bit). + * Note that we should never be in a situation where a previous attempt + * is still pending (unless the HW is totally dead), but better to be + * safe in case something unexpected happens + */ + ret = intel_wait_for_register_fw(uncore, GU_CNTL, DRIVERFLR, 0, flr_timeout_ms); + if (ret) { + drm_err(&i915->drm, + "Failed to wait for Driver-FLR bit to clear! %d\n", + ret); + return; + } + intel_uncore_write_fw(uncore, GU_DEBUG, DRIVERFLR_STATUS); + + /* Trigger the actual Driver-FLR */ + intel_uncore_rmw_fw(uncore, GU_CNTL, 0, DRIVERFLR); + + ret = intel_wait_for_register_fw(uncore, GU_DEBUG, + DRIVERFLR_STATUS, DRIVERFLR_STATUS, + flr_timeout_ms); + if (ret) { + drm_err(&i915->drm, "wait for Driver-FLR completion failed! %d\n", ret); + return; + } + + intel_uncore_write_fw(uncore, GU_DEBUG, DRIVERFLR_STATUS); +} + /* Called via drm-managed action */ void intel_uncore_fini_mmio(struct drm_device *dev, void *data) { @@ -2715,6 +2768,9 @@ void intel_uncore_fini_mmio(struct drm_device *dev, void *data) intel_uncore_fw_domains_fini(uncore); iosf_mbi_punit_release(); } + + if (intel_uncore_needs_flr_on_fini(uncore)) + driver_initiated_flr(uncore); } /** |