[Intel-gfx] [PATCH 30/40] drm/i915: Pull all the reset functionality together into i915_reset.c
Chris Wilson
chris at chris-wilson.co.uk
Wed Sep 19 19:55:34 UTC 2018
Currently the code to reset the GPU and our state is spread widely
across a few files. Pull the logic together into a common file.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/Makefile | 3 +-
drivers/gpu/drm/i915/i915_debugfs.c | 2 +
drivers/gpu/drm/i915/i915_drv.c | 205 +--
drivers/gpu/drm/i915/i915_drv.h | 33 +-
drivers/gpu/drm/i915/i915_gem.c | 485 +-----
drivers/gpu/drm/i915/i915_gem_gtt.c | 1 +
drivers/gpu/drm/i915/i915_irq.c | 238 ---
drivers/gpu/drm/i915/i915_request.c | 1 +
drivers/gpu/drm/i915/i915_reset.c | 1332 +++++++++++++++++
drivers/gpu/drm/i915/i915_reset.h | 39 +
drivers/gpu/drm/i915/intel_display.c | 15 +-
drivers/gpu/drm/i915/intel_guc.h | 3 +
drivers/gpu/drm/i915/intel_hangcheck.c | 1 +
drivers/gpu/drm/i915/intel_uc.c | 1 +
drivers/gpu/drm/i915/intel_uncore.c | 451 ------
drivers/gpu/drm/i915/selftests/intel_lrc.c | 2 +
.../drm/i915/selftests/intel_workarounds.c | 1 +
17 files changed, 1408 insertions(+), 1405 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_reset.c
create mode 100644 drivers/gpu/drm/i915/i915_reset.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index ef1480c14e4e..4654ef481b45 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -40,7 +40,8 @@ i915-y := i915_drv.o \
i915_mm.o \
i915_params.o \
i915_pci.o \
- i915_suspend.o \
+ i915_reset.o \
+ i915_suspend.o \
i915_syncmap.o \
i915_sw_fence.o \
i915_sysfs.o \
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 64cb9b56618b..6f38f00e3765 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -32,6 +32,8 @@
#include "intel_drv.h"
#include "intel_guc_submission.h"
+#include "i915_reset.h"
+
static inline struct drm_i915_private *node_to_i915(struct drm_info_node *node)
{
return to_i915(node->minor->dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e0ab875b4193..7caa6f17110c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -49,6 +49,7 @@
#include "i915_drv.h"
#include "i915_trace.h"
#include "i915_pmu.h"
+#include "i915_reset.h"
#include "i915_query.h"
#include "i915_vgpu.h"
#include "intel_drv.h"
@@ -2192,210 +2193,6 @@ static int i915_resume_switcheroo(struct drm_device *dev)
return i915_drm_resume(dev);
}
-/**
- * i915_reset - reset chip after a hang
- * @i915: #drm_i915_private to reset
- * @stalled_mask: mask of the stalled engines with the guilty requests
- * @reason: user error message for why we are resetting
- *
- * Reset the chip. Useful if a hang is detected. Marks the device as wedged
- * on failure.
- *
- * Caller must hold the struct_mutex.
- *
- * Procedure is fairly simple:
- * - reset the chip using the reset reg
- * - re-init context state
- * - re-init hardware status page
- * - re-init ring buffer
- * - re-init interrupt state
- * - re-init display
- */
-void i915_reset(struct drm_i915_private *i915,
- unsigned int stalled_mask,
- const char *reason)
-{
- struct i915_gpu_error *error = &i915->gpu_error;
- int ret;
- int i;
-
- GEM_TRACE("flags=%lx\n", error->flags);
-
- might_sleep();
- lockdep_assert_held(&i915->drm.struct_mutex);
- GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
-
- if (!test_bit(I915_RESET_HANDOFF, &error->flags))
- return;
-
- /* Clear any previous failed attempts at recovery. Time to try again. */
- if (!i915_gem_unset_wedged(i915))
- goto wakeup;
-
- if (reason)
- dev_notice(i915->drm.dev, "Resetting chip for %s\n", reason);
- error->reset_count++;
-
- ret = i915_gem_reset_prepare(i915);
- if (ret) {
- dev_err(i915->drm.dev, "GPU recovery failed\n");
- goto taint;
- }
-
- if (!intel_has_gpu_reset(i915)) {
- if (i915_modparams.reset)
- dev_err(i915->drm.dev, "GPU reset not supported\n");
- else
- DRM_DEBUG_DRIVER("GPU reset disabled\n");
- goto error;
- }
-
- for (i = 0; i < 3; i++) {
- ret = intel_gpu_reset(i915, ALL_ENGINES);
- if (ret == 0)
- break;
-
- msleep(100);
- }
- if (ret) {
- dev_err(i915->drm.dev, "Failed to reset chip\n");
- goto taint;
- }
-
- /* Ok, now get things going again... */
-
- /*
- * Everything depends on having the GTT running, so we need to start
- * there.
- */
- ret = i915_ggtt_enable_hw(i915);
- if (ret) {
- DRM_ERROR("Failed to re-enable GGTT following reset (%d)\n",
- ret);
- goto error;
- }
-
- i915_gem_reset(i915, stalled_mask);
- intel_overlay_reset(i915);
-
- /*
- * Next we need to restore the context, but we don't use those
- * yet either...
- *
- * Ring buffer needs to be re-initialized in the KMS case, or if X
- * was running at the time of the reset (i.e. we weren't VT
- * switched away).
- */
- ret = i915_gem_init_hw(i915);
- if (ret) {
- DRM_ERROR("Failed to initialise HW following reset (%d)\n",
- ret);
- goto error;
- }
-
- i915_queue_hangcheck(i915);
-
-finish:
- i915_gem_reset_finish(i915);
-wakeup:
- clear_bit(I915_RESET_HANDOFF, &error->flags);
- wake_up_bit(&error->flags, I915_RESET_HANDOFF);
- return;
-
-taint:
- /*
- * History tells us that if we cannot reset the GPU now, we
- * never will. This then impacts everything that is run
- * subsequently. On failing the reset, we mark the driver
- * as wedged, preventing further execution on the GPU.
- * We also want to go one step further and add a taint to the
- * kernel so that any subsequent faults can be traced back to
- * this failure. This is important for CI, where if the
- * GPU/driver fails we would like to reboot and restart testing
- * rather than continue on into oblivion. For everyone else,
- * the system should still plod along, but they have been warned!
- */
- add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
-error:
- i915_gem_set_wedged(i915);
- i915_retire_requests(i915);
- goto finish;
-}
-
-static inline int intel_gt_reset_engine(struct drm_i915_private *dev_priv,
- struct intel_engine_cs *engine)
-{
- return intel_gpu_reset(dev_priv, intel_engine_flag(engine));
-}
-
-/**
- * i915_reset_engine - reset GPU engine to recover from a hang
- * @engine: engine to reset
- * @msg: reason for GPU reset; or NULL for no dev_notice()
- *
- * Reset a specific GPU engine. Useful if a hang is detected.
- * Returns zero on successful reset or otherwise an error code.
- *
- * Procedure is:
- * - identifies the request that caused the hang and it is dropped
- * - reset engine (which will force the engine to idle)
- * - re-init/configure engine
- */
-int i915_reset_engine(struct intel_engine_cs *engine, const char *msg)
-{
- struct i915_gpu_error *error = &engine->i915->gpu_error;
- struct i915_request *active_request;
- int ret;
-
- GEM_TRACE("%s flags=%lx\n", engine->name, error->flags);
- GEM_BUG_ON(!test_bit(I915_RESET_ENGINE + engine->id, &error->flags));
-
- active_request = i915_gem_reset_prepare_engine(engine);
- if (IS_ERR_OR_NULL(active_request)) {
- /* Either the previous reset failed, or we pardon the reset. */
- ret = PTR_ERR(active_request);
- goto out;
- }
-
- if (msg)
- dev_notice(engine->i915->drm.dev,
- "Resetting %s for %s\n", engine->name, msg);
- error->reset_engine_count[engine->id]++;
-
- if (!engine->i915->guc.execbuf_client)
- ret = intel_gt_reset_engine(engine->i915, engine);
- else
- ret = intel_guc_reset_engine(&engine->i915->guc, engine);
- if (ret) {
- /* If we fail here, we expect to fallback to a global reset */
- DRM_DEBUG_DRIVER("%sFailed to reset %s, ret=%d\n",
- engine->i915->guc.execbuf_client ? "GuC " : "",
- engine->name, ret);
- goto out;
- }
-
- /*
- * The request that caused the hang is stuck on elsp, we know the
- * active request and can drop it, adjust head to skip the offending
- * request to resume executing remaining requests in the queue.
- */
- i915_gem_reset_engine(engine, active_request, true);
-
- /*
- * The engine and its registers (and workarounds in case of render)
- * have been reset to their default values. Follow the init_ring
- * process to program RING_MODE, HWSP and re-enable submission.
- */
- ret = engine->init_hw(engine);
- if (ret)
- goto out;
-
-out:
- intel_engine_cancel_stop_cs(engine);
- i915_gem_reset_finish_engine(engine);
- return ret;
-}
-
static int i915_pm_prepare(struct device *kdev)
{
struct pci_dev *pdev = to_pci_dev(kdev);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 30934abdbd14..ad4e792f3373 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2780,19 +2780,7 @@ extern const struct dev_pm_ops i915_pm_ops;
extern int i915_driver_load(struct pci_dev *pdev,
const struct pci_device_id *ent);
extern void i915_driver_unload(struct drm_device *dev);
-extern int intel_gpu_reset(struct drm_i915_private *dev_priv, u32 engine_mask);
-extern bool intel_has_gpu_reset(struct drm_i915_private *dev_priv);
-
-extern void i915_reset(struct drm_i915_private *i915,
- unsigned int stalled_mask,
- const char *reason);
-extern int i915_reset_engine(struct intel_engine_cs *engine,
- const char *reason);
-
-extern bool intel_has_reset_engine(struct drm_i915_private *dev_priv);
-extern int intel_reset_guc(struct drm_i915_private *dev_priv);
-extern int intel_guc_reset_engine(struct intel_guc *guc,
- struct intel_engine_cs *engine);
+
extern void intel_engine_init_hangcheck(struct intel_engine_cs *engine);
extern void intel_hangcheck_init(struct drm_i915_private *dev_priv);
extern unsigned long i915_chipset_val(struct drm_i915_private *dev_priv);
@@ -2835,20 +2823,11 @@ static inline void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
&dev_priv->gpu_error.hangcheck_work, delay);
}
-__printf(4, 5)
-void i915_handle_error(struct drm_i915_private *dev_priv,
- u32 engine_mask,
- unsigned long flags,
- const char *fmt, ...);
-#define I915_ERROR_CAPTURE BIT(0)
-
extern void intel_irq_init(struct drm_i915_private *dev_priv);
extern void intel_irq_fini(struct drm_i915_private *dev_priv);
int intel_irq_install(struct drm_i915_private *dev_priv);
void intel_irq_uninstall(struct drm_i915_private *dev_priv);
-void i915_clear_error_registers(struct drm_i915_private *dev_priv);
-
static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
{
return dev_priv->gvt;
@@ -3213,18 +3192,8 @@ static inline u32 i915_reset_engine_count(struct i915_gpu_error *error,
return READ_ONCE(error->reset_engine_count[engine->id]);
}
-struct i915_request *
-i915_gem_reset_prepare_engine(struct intel_engine_cs *engine);
-int i915_gem_reset_prepare(struct drm_i915_private *dev_priv);
-void i915_gem_reset(struct drm_i915_private *dev_priv,
- unsigned int stalled_mask);
-void i915_gem_reset_finish_engine(struct intel_engine_cs *engine);
-void i915_gem_reset_finish(struct drm_i915_private *dev_priv);
void i915_gem_set_wedged(struct drm_i915_private *dev_priv);
bool i915_gem_unset_wedged(struct drm_i915_private *dev_priv);
-void i915_gem_reset_engine(struct intel_engine_cs *engine,
- struct i915_request *request,
- bool stalled);
void i915_gem_init_mmio(struct drm_i915_private *i915);
int __must_check i915_gem_init(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a2e7f7487588..c03e413f1db8 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -28,15 +28,6 @@
#include <drm/drmP.h>
#include <drm/drm_vma_manager.h>
#include <drm/i915_drm.h>
-#include "i915_drv.h"
-#include "i915_gem_clflush.h"
-#include "i915_vgpu.h"
-#include "i915_trace.h"
-#include "intel_drv.h"
-#include "intel_frontbuffer.h"
-#include "intel_mocs.h"
-#include "intel_workarounds.h"
-#include "i915_gemfs.h"
#include <linux/dma-fence-array.h>
#include <linux/kthread.h>
#include <linux/reservation.h>
@@ -47,6 +38,18 @@
#include <linux/pci.h>
#include <linux/dma-buf.h>
+#include "i915_drv.h"
+#include "i915_gem_clflush.h"
+#include "i915_gemfs.h"
+#include "i915_reset.h"
+#include "i915_trace.h"
+#include "i915_vgpu.h"
+
+#include "intel_drv.h"
+#include "intel_frontbuffer.h"
+#include "intel_mocs.h"
+#include "intel_workarounds.h"
+
static void i915_gem_flush_free_objects(struct drm_i915_private *i915);
static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
@@ -2993,61 +2996,6 @@ i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj,
return 0;
}
-static void i915_gem_client_mark_guilty(struct drm_i915_file_private *file_priv,
- const struct i915_gem_context *ctx)
-{
- unsigned int score;
- unsigned long prev_hang;
-
- if (i915_gem_context_is_banned(ctx))
- score = I915_CLIENT_SCORE_CONTEXT_BAN;
- else
- score = 0;
-
- prev_hang = xchg(&file_priv->hang_timestamp, jiffies);
- if (time_before(jiffies, prev_hang + I915_CLIENT_FAST_HANG_JIFFIES))
- score += I915_CLIENT_SCORE_HANG_FAST;
-
- if (score) {
- atomic_add(score, &file_priv->ban_score);
-
- DRM_DEBUG_DRIVER("client %s: gained %u ban score, now %u\n",
- ctx->name, score,
- atomic_read(&file_priv->ban_score));
- }
-}
-
-static void i915_gem_context_mark_guilty(struct i915_gem_context *ctx)
-{
- unsigned int score;
- bool banned, bannable;
-
- atomic_inc(&ctx->guilty_count);
-
- bannable = i915_gem_context_is_bannable(ctx);
- score = atomic_add_return(CONTEXT_SCORE_GUILTY, &ctx->ban_score);
- banned = score >= CONTEXT_SCORE_BAN_THRESHOLD;
-
- /* Cool contexts don't accumulate client ban score */
- if (!bannable)
- return;
-
- if (banned) {
- DRM_DEBUG_DRIVER("context %s: guilty %d, score %u, banned\n",
- ctx->name, atomic_read(&ctx->guilty_count),
- score);
- i915_gem_context_set_banned(ctx);
- }
-
- if (!IS_ERR_OR_NULL(ctx->file_priv))
- i915_gem_client_mark_guilty(ctx->file_priv, ctx);
-}
-
-static void i915_gem_context_mark_innocent(struct i915_gem_context *ctx)
-{
- atomic_inc(&ctx->active_count);
-}
-
struct i915_request *
i915_gem_find_active_request(struct intel_engine_cs *engine)
{
@@ -3078,415 +3026,6 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
return active;
}
-/*
- * Ensure irq handler finishes, and not run again.
- * Also return the active request so that we only search for it once.
- */
-struct i915_request *
-i915_gem_reset_prepare_engine(struct intel_engine_cs *engine)
-{
- struct i915_request *request;
-
- /*
- * During the reset sequence, we must prevent the engine from
- * entering RC6. As the context state is undefined until we restart
- * the engine, if it does enter RC6 during the reset, the state
- * written to the powercontext is undefined and so we may lose
- * GPU state upon resume, i.e. fail to restart after a reset.
- */
- intel_uncore_forcewake_get(engine->i915, FORCEWAKE_ALL);
-
- request = engine->reset.prepare(engine);
- if (request && request->fence.error == -EIO)
- request = ERR_PTR(-EIO); /* Previous reset failed! */
-
- return request;
-}
-
-int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
-{
- struct intel_engine_cs *engine;
- struct i915_request *request;
- enum intel_engine_id id;
- int err = 0;
-
- for_each_engine(engine, dev_priv, id) {
- request = i915_gem_reset_prepare_engine(engine);
- if (IS_ERR(request)) {
- err = PTR_ERR(request);
- continue;
- }
-
- engine->hangcheck.active_request = request;
- }
-
- i915_gem_revoke_fences(dev_priv);
- intel_uc_sanitize(dev_priv);
-
- return err;
-}
-
-static void engine_skip_context(struct i915_request *request)
-{
- struct intel_engine_cs *engine = request->engine;
- struct i915_gem_context *hung_ctx = request->gem_context;
- struct i915_timeline *timeline = request->timeline;
- unsigned long flags;
-
- GEM_BUG_ON(timeline == &engine->timeline);
-
- spin_lock_irqsave(&engine->timeline.lock, flags);
- spin_lock(&timeline->lock);
-
- list_for_each_entry_continue(request, &engine->timeline.requests, link)
- if (request->gem_context == hung_ctx)
- i915_request_skip(request, -EIO);
-
- list_for_each_entry(request, &timeline->requests, link)
- i915_request_skip(request, -EIO);
-
- spin_unlock(&timeline->lock);
- spin_unlock_irqrestore(&engine->timeline.lock, flags);
-}
-
-/* Returns the request if it was guilty of the hang */
-static struct i915_request *
-i915_gem_reset_request(struct intel_engine_cs *engine,
- struct i915_request *request,
- bool stalled)
-{
- /* The guilty request will get skipped on a hung engine.
- *
- * Users of client default contexts do not rely on logical
- * state preserved between batches so it is safe to execute
- * queued requests following the hang. Non default contexts
- * rely on preserved state, so skipping a batch loses the
- * evolution of the state and it needs to be considered corrupted.
- * Executing more queued batches on top of corrupted state is
- * risky. But we take the risk by trying to advance through
- * the queued requests in order to make the client behaviour
- * more predictable around resets, by not throwing away random
- * amount of batches it has prepared for execution. Sophisticated
- * clients can use gem_reset_stats_ioctl and dma fence status
- * (exported via sync_file info ioctl on explicit fences) to observe
- * when it loses the context state and should rebuild accordingly.
- *
- * The context ban, and ultimately the client ban, mechanism are safety
- * valves if client submission ends up resulting in nothing more than
- * subsequent hangs.
- */
-
- if (i915_request_completed(request)) {
- GEM_TRACE("%s pardoned global=%d (fence %llx:%d), current %d\n",
- engine->name, request->global_seqno,
- request->fence.context, request->fence.seqno,
- intel_engine_get_seqno(engine));
- stalled = false;
- }
-
- if (stalled) {
- i915_gem_context_mark_guilty(request->gem_context);
- i915_request_skip(request, -EIO);
-
- /* If this context is now banned, skip all pending requests. */
- if (i915_gem_context_is_banned(request->gem_context))
- engine_skip_context(request);
- } else {
- /*
- * Since this is not the hung engine, it may have advanced
- * since the hang declaration. Double check by refinding
- * the active request at the time of the reset.
- */
- request = i915_gem_find_active_request(engine);
- if (request) {
- unsigned long flags;
-
- i915_gem_context_mark_innocent(request->gem_context);
- dma_fence_set_error(&request->fence, -EAGAIN);
-
- /* Rewind the engine to replay the incomplete rq */
- spin_lock_irqsave(&engine->timeline.lock, flags);
- request = list_prev_entry(request, link);
- if (&request->link == &engine->timeline.requests)
- request = NULL;
- spin_unlock_irqrestore(&engine->timeline.lock, flags);
- }
- }
-
- return request;
-}
-
-void i915_gem_reset_engine(struct intel_engine_cs *engine,
- struct i915_request *request,
- bool stalled)
-{
- /*
- * Make sure this write is visible before we re-enable the interrupt
- * handlers on another CPU, as tasklet_enable() resolves to just
- * a compiler barrier which is insufficient for our purpose here.
- */
- smp_store_mb(engine->irq_posted, 0);
-
- if (request)
- request = i915_gem_reset_request(engine, request, stalled);
-
- /* Setup the CS to resume from the breadcrumb of the hung request */
- engine->reset.reset(engine, request);
-}
-
-void i915_gem_reset(struct drm_i915_private *dev_priv,
- unsigned int stalled_mask)
-{
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- i915_retire_requests(dev_priv);
-
- for_each_engine(engine, dev_priv, id) {
- struct intel_context *ce;
-
- i915_gem_reset_engine(engine,
- engine->hangcheck.active_request,
- stalled_mask & ENGINE_MASK(id));
- ce = fetch_and_zero(&engine->last_retired_context);
- if (ce)
- intel_context_unpin(ce);
-
- /*
- * Ostensibily, we always want a context loaded for powersaving,
- * so if the engine is idle after the reset, send a request
- * to load our scratch kernel_context.
- *
- * More mysteriously, if we leave the engine idle after a reset,
- * the next userspace batch may hang, with what appears to be
- * an incoherent read by the CS (presumably stale TLB). An
- * empty request appears sufficient to paper over the glitch.
- */
- if (intel_engine_is_idle(engine)) {
- struct i915_request *rq;
-
- rq = i915_request_alloc(engine,
- dev_priv->kernel_context);
- if (!IS_ERR(rq))
- i915_request_add(rq);
- }
- }
-
- i915_gem_restore_fences(dev_priv);
-}
-
-void i915_gem_reset_finish_engine(struct intel_engine_cs *engine)
-{
- engine->reset.finish(engine);
-
- intel_uncore_forcewake_put(engine->i915, FORCEWAKE_ALL);
-}
-
-void i915_gem_reset_finish(struct drm_i915_private *dev_priv)
-{
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- for_each_engine(engine, dev_priv, id) {
- engine->hangcheck.active_request = NULL;
- i915_gem_reset_finish_engine(engine);
- }
-}
-
-static void nop_submit_request(struct i915_request *request)
-{
- GEM_TRACE("%s fence %llx:%d -> -EIO\n",
- request->engine->name,
- request->fence.context, request->fence.seqno);
- dma_fence_set_error(&request->fence, -EIO);
-
- i915_request_submit(request);
-}
-
-static void nop_complete_submit_request(struct i915_request *request)
-{
- unsigned long flags;
-
- GEM_TRACE("%s fence %llx:%d -> -EIO\n",
- request->engine->name,
- request->fence.context, request->fence.seqno);
- dma_fence_set_error(&request->fence, -EIO);
-
- spin_lock_irqsave(&request->engine->timeline.lock, flags);
- __i915_request_submit(request);
- intel_engine_init_global_seqno(request->engine, request->global_seqno);
- spin_unlock_irqrestore(&request->engine->timeline.lock, flags);
-}
-
-void i915_gem_set_wedged(struct drm_i915_private *i915)
-{
- struct i915_gpu_error *error = &i915->gpu_error;
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- mutex_lock(&error->wedge_mutex);
- if (test_bit(I915_WEDGED, &error->flags)) {
- mutex_unlock(&error->wedge_mutex);
- return;
- }
-
- if (GEM_SHOW_DEBUG()) {
- struct drm_printer p = drm_debug_printer(__func__);
-
- for_each_engine(engine, i915, id)
- intel_engine_dump(engine, &p, "%s\n", engine->name);
- }
-
- GEM_TRACE("start\n");
-
- /*
- * First, stop submission to hw, but do not yet complete requests by
- * rolling the global seqno forward (since this would complete requests
- * for which we haven't set the fence error to EIO yet).
- */
- for_each_engine(engine, i915, id) {
- i915_gem_reset_prepare_engine(engine);
-
- engine->submit_request = nop_submit_request;
- engine->schedule = NULL;
- }
- i915->caps.scheduler = 0;
-
- /* Even if the GPU reset fails, it should still stop the engines */
- if (INTEL_GEN(i915) >= 5)
- intel_gpu_reset(i915, ALL_ENGINES);
-
- /*
- * Make sure no one is running the old callback before we proceed with
- * cancelling requests and resetting the completion tracking. Otherwise
- * we might submit a request to the hardware which never completes.
- */
- synchronize_rcu();
-
- for_each_engine(engine, i915, id) {
- /* Mark all executing requests as skipped */
- engine->cancel_requests(engine);
-
- /*
- * Only once we've force-cancelled all in-flight requests can we
- * start to complete all requests.
- */
- engine->submit_request = nop_complete_submit_request;
- }
-
- /*
- * Make sure no request can slip through without getting completed by
- * either this call here to intel_engine_init_global_seqno, or the one
- * in nop_complete_submit_request.
- */
- synchronize_rcu();
-
- for_each_engine(engine, i915, id) {
- unsigned long flags;
-
- /*
- * Mark all pending requests as complete so that any concurrent
- * (lockless) lookup doesn't try and wait upon the request as we
- * reset it.
- */
- spin_lock_irqsave(&engine->timeline.lock, flags);
- intel_engine_init_global_seqno(engine,
- intel_engine_last_submit(engine));
- spin_unlock_irqrestore(&engine->timeline.lock, flags);
-
- i915_gem_reset_finish_engine(engine);
- }
-
- smp_mb__before_atomic();
- set_bit(I915_WEDGED, &error->flags);
-
- GEM_TRACE("end\n");
- mutex_unlock(&error->wedge_mutex);
-
- wake_up_all(&error->reset_queue);
-}
-
-bool i915_gem_unset_wedged(struct drm_i915_private *i915)
-{
- struct i915_gpu_error *error = &i915->gpu_error;
- struct i915_timeline *tl;
- bool ret = false;
-
- lockdep_assert_held(&i915->drm.struct_mutex);
-
- if (!test_bit(I915_WEDGED, &error->flags))
- return true;
-
- mutex_lock(&error->wedge_mutex);
-
- GEM_TRACE("start\n");
-
- /*
- * Before unwedging, make sure that all pending operations
- * are flushed and errored out - we may have requests waiting upon
- * third party fences. We marked all inflight requests as EIO, and
- * every execbuf since returned EIO, for consistency we want all
- * the currently pending requests to also be marked as EIO, which
- * is done inside our nop_submit_request - and so we must wait.
- *
- * No more can be submitted until we reset the wedged bit.
- */
- list_for_each_entry(tl, &i915->gt.timelines, link) {
- struct i915_request *rq;
-
- rq = i915_gem_active_peek(&tl->last_request,
- &i915->drm.struct_mutex);
- if (!rq)
- continue;
-
- /*
- * We can't use our normal waiter as we want to
- * avoid recursively trying to handle the current
- * reset. The basic dma_fence_default_wait() installs
- * a callback for dma_fence_signal(), which is
- * triggered by our nop handler (indirectly, the
- * callback enables the signaler thread which is
- * woken by the nop_submit_request() advancing the seqno
- * and when the seqno passes the fence, the signaler
- * then signals the fence waking us up).
- */
- if (dma_fence_default_wait(&rq->fence, true,
- MAX_SCHEDULE_TIMEOUT) < 0)
- goto unlock;
- }
- i915_retire_requests(i915);
- GEM_BUG_ON(i915->gt.active_requests);
-
- if (!intel_gpu_reset(i915, ALL_ENGINES))
- intel_engines_sanitize(i915);
-
- /*
- * Undo nop_submit_request. We prevent all new i915 requests from
- * being queued (by disallowing execbuf whilst wedged) so having
- * waited for all active requests above, we know the system is idle
- * and do not have to worry about a thread being inside
- * engine->submit_request() as we swap over. So unlike installing
- * the nop_submit_request on reset, we can do this from normal
- * context and do not require stop_machine().
- */
- intel_engines_reset_default_submission(i915);
- i915_gem_contexts_lost(i915);
-
- GEM_TRACE("end\n");
-
- smp_mb__before_atomic(); /* complete takeover before enabling execbuf */
- clear_bit(I915_WEDGED, &i915->gpu_error.flags);
- ret = true;
-unlock:
- mutex_unlock(&i915->gpu_error.wedge_mutex);
-
- return ret;
-}
-
static void
i915_gem_retire_work_handler(struct work_struct *work)
{
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 719e1ac212c1..d1ca67459bc2 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -38,6 +38,7 @@
#include "i915_drv.h"
#include "i915_vgpu.h"
+#include "i915_reset.h"
#include "i915_trace.h"
#include "intel_drv.h"
#include "intel_frontbuffer.h"
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 83e15288ae96..05035fcad266 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2920,46 +2920,6 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
return IRQ_HANDLED;
}
-struct wedge_me {
- struct delayed_work work;
- struct drm_i915_private *i915;
- const char *name;
-};
-
-static void wedge_me(struct work_struct *work)
-{
- struct wedge_me *w = container_of(work, typeof(*w), work.work);
-
- dev_err(w->i915->drm.dev,
- "%s timed out, cancelling all in-flight rendering.\n",
- w->name);
- i915_gem_set_wedged(w->i915);
-}
-
-static void __init_wedge(struct wedge_me *w,
- struct drm_i915_private *i915,
- long timeout,
- const char *name)
-{
- w->i915 = i915;
- w->name = name;
-
- INIT_DELAYED_WORK_ONSTACK(&w->work, wedge_me);
- schedule_delayed_work(&w->work, timeout);
-}
-
-static void __fini_wedge(struct wedge_me *w)
-{
- cancel_delayed_work_sync(&w->work);
- destroy_delayed_work_on_stack(&w->work);
- w->i915 = NULL;
-}
-
-#define i915_wedge_on_timeout(W, DEV, TIMEOUT) \
- for (__init_wedge((W), (DEV), (TIMEOUT), __func__); \
- (W)->i915; \
- __fini_wedge((W)))
-
static u32
gen11_gt_engine_identity(struct drm_i915_private * const i915,
const unsigned int bank, const unsigned int bit)
@@ -3164,204 +3124,6 @@ static irqreturn_t gen11_irq_handler(int irq, void *arg)
return IRQ_HANDLED;
}
-static void i915_reset_device(struct drm_i915_private *dev_priv,
- u32 engine_mask,
- const char *reason)
-{
- struct i915_gpu_error *error = &dev_priv->gpu_error;
- struct kobject *kobj = &dev_priv->drm.primary->kdev->kobj;
- char *error_event[] = { I915_ERROR_UEVENT "=1", NULL };
- char *reset_event[] = { I915_RESET_UEVENT "=1", NULL };
- char *reset_done_event[] = { I915_ERROR_UEVENT "=0", NULL };
- struct wedge_me w;
-
- kobject_uevent_env(kobj, KOBJ_CHANGE, error_event);
-
- DRM_DEBUG_DRIVER("resetting chip\n");
- kobject_uevent_env(kobj, KOBJ_CHANGE, reset_event);
-
- /* Use a watchdog to ensure that our reset completes */
- i915_wedge_on_timeout(&w, dev_priv, 5*HZ) {
- intel_prepare_reset(dev_priv);
-
- error->reason = reason;
- error->stalled_mask = engine_mask;
-
- /* Signal that locked waiters should reset the GPU */
- smp_mb__before_atomic();
- set_bit(I915_RESET_HANDOFF, &error->flags);
- wake_up_all(&error->wait_queue);
-
- /* Wait for anyone holding the lock to wakeup, without
- * blocking indefinitely on struct_mutex.
- */
- do {
- if (mutex_trylock(&dev_priv->drm.struct_mutex)) {
- i915_reset(dev_priv, engine_mask, reason);
- mutex_unlock(&dev_priv->drm.struct_mutex);
- }
- } while (wait_on_bit_timeout(&error->flags,
- I915_RESET_HANDOFF,
- TASK_UNINTERRUPTIBLE,
- 1));
-
- error->stalled_mask = 0;
- error->reason = NULL;
-
- intel_finish_reset(dev_priv);
- }
-
- if (!test_bit(I915_WEDGED, &error->flags))
- kobject_uevent_env(kobj, KOBJ_CHANGE, reset_done_event);
-}
-
-void i915_clear_error_registers(struct drm_i915_private *dev_priv)
-{
- u32 eir;
-
- if (!IS_GEN2(dev_priv))
- I915_WRITE(PGTBL_ER, I915_READ(PGTBL_ER));
-
- if (INTEL_GEN(dev_priv) < 4)
- I915_WRITE(IPEIR, I915_READ(IPEIR));
- else
- I915_WRITE(IPEIR_I965, I915_READ(IPEIR_I965));
-
- I915_WRITE(EIR, I915_READ(EIR));
- eir = I915_READ(EIR);
- if (eir) {
- /*
- * some errors might have become stuck,
- * mask them.
- */
- DRM_DEBUG_DRIVER("EIR stuck: 0x%08x, masking\n", eir);
- I915_WRITE(EMR, I915_READ(EMR) | eir);
- I915_WRITE(IIR, I915_MASTER_ERROR_INTERRUPT);
- }
-
- if (INTEL_GEN(dev_priv) >= 8) {
- I915_WRITE(GEN8_RING_FAULT_REG,
- I915_READ(GEN8_RING_FAULT_REG) & ~RING_FAULT_VALID);
- POSTING_READ(GEN8_RING_FAULT_REG);
- } else if (INTEL_GEN(dev_priv) >= 6) {
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- for_each_engine(engine, dev_priv, id) {
- I915_WRITE(RING_FAULT_REG(engine),
- I915_READ(RING_FAULT_REG(engine)) &
- ~RING_FAULT_VALID);
- }
- POSTING_READ(RING_FAULT_REG(dev_priv->engine[RCS]));
- }
-}
-
-/**
- * i915_handle_error - handle a gpu error
- * @dev_priv: i915 device private
- * @engine_mask: mask representing engines that are hung
- * @flags: control flags
- * @fmt: Error message format string
- *
- * Do some basic checking of register state at error time and
- * dump it to the syslog. Also call i915_capture_error_state() to make
- * sure we get a record and make it available in debugfs. Fire a uevent
- * so userspace knows something bad happened (should trigger collection
- * of a ring dump etc.).
- */
-void i915_handle_error(struct drm_i915_private *dev_priv,
- u32 engine_mask,
- unsigned long flags,
- const char *fmt, ...)
-{
- struct intel_engine_cs *engine;
- intel_wakeref_t wakeref;
- unsigned int tmp;
- char error_msg[80];
- char *msg = NULL;
-
- if (fmt) {
- va_list args;
-
- va_start(args, fmt);
- vscnprintf(error_msg, sizeof(error_msg), fmt, args);
- va_end(args);
-
- msg = error_msg;
- }
-
- /*
- * In most cases it's guaranteed that we get here with an RPM
- * reference held, for example because there is a pending GPU
- * request that won't finish until the reset is done. This
- * isn't the case at least when we get here by doing a
- * simulated reset via debugfs, so get an RPM reference.
- */
- wakeref = intel_runtime_pm_get(dev_priv);
-
- engine_mask &= INTEL_INFO(dev_priv)->ring_mask;
-
- if (flags & I915_ERROR_CAPTURE) {
- i915_capture_error_state(dev_priv, engine_mask, msg);
- i915_clear_error_registers(dev_priv);
- }
-
- /*
- * Try engine reset when available. We fall back to full reset if
- * single reset fails.
- */
- if (intel_has_reset_engine(dev_priv) &&
- !i915_terminally_wedged(&dev_priv->gpu_error)) {
- for_each_engine_masked(engine, dev_priv, engine_mask, tmp) {
- BUILD_BUG_ON(I915_RESET_MODESET >= I915_RESET_ENGINE);
- if (test_and_set_bit(I915_RESET_ENGINE + engine->id,
- &dev_priv->gpu_error.flags))
- continue;
-
- if (i915_reset_engine(engine, msg) == 0)
- engine_mask &= ~intel_engine_flag(engine);
-
- clear_bit(I915_RESET_ENGINE + engine->id,
- &dev_priv->gpu_error.flags);
- wake_up_bit(&dev_priv->gpu_error.flags,
- I915_RESET_ENGINE + engine->id);
- }
- }
-
- if (!engine_mask)
- goto out;
-
- /* Full reset needs the mutex, stop any other user trying to do so. */
- if (test_and_set_bit(I915_RESET_BACKOFF, &dev_priv->gpu_error.flags)) {
- wait_event(dev_priv->gpu_error.reset_queue,
- !test_bit(I915_RESET_BACKOFF,
- &dev_priv->gpu_error.flags));
- goto out;
- }
-
- /* Prevent any other reset-engine attempt. */
- for_each_engine(engine, dev_priv, tmp) {
- while (test_and_set_bit(I915_RESET_ENGINE + engine->id,
- &dev_priv->gpu_error.flags))
- wait_on_bit(&dev_priv->gpu_error.flags,
- I915_RESET_ENGINE + engine->id,
- TASK_UNINTERRUPTIBLE);
- }
-
- i915_reset_device(dev_priv, engine_mask, msg);
-
- for_each_engine(engine, dev_priv, tmp) {
- clear_bit(I915_RESET_ENGINE + engine->id,
- &dev_priv->gpu_error.flags);
- }
-
- clear_bit(I915_RESET_BACKOFF, &dev_priv->gpu_error.flags);
- wake_up_all(&dev_priv->gpu_error.reset_queue);
-
-out:
- intel_runtime_pm_put(dev_priv, wakeref);
-}
-
/* Called from drm generic code, passed 'crtc' which
* we use as a pipe index
*/
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index abd4dacbab8e..fc7ad8dbc36e 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -29,6 +29,7 @@
#include <linux/sched/signal.h>
#include "i915_drv.h"
+#include "i915_reset.h"
static const char *i915_fence_get_driver_name(struct dma_fence *fence)
{
diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
new file mode 100644
index 000000000000..d52de3ec9ba0
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -0,0 +1,1332 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2008-2018 Intel Corporation
+ */
+
+#include <linux/sched/mm.h>
+
+#include "i915_drv.h"
+#include "i915_gpu_error.h"
+#include "i915_reset.h"
+
+#include "intel_guc.h"
+
+static void engine_skip_context(struct i915_request *rq)
+{
+ struct intel_engine_cs *engine = rq->engine;
+ struct i915_gem_context *hung_ctx = rq->gem_context;
+ struct i915_timeline *timeline = rq->timeline;
+ unsigned long flags;
+
+ GEM_BUG_ON(timeline == &engine->timeline);
+
+ spin_lock_irqsave(&engine->timeline.lock, flags);
+ spin_lock(&timeline->lock);
+
+ list_for_each_entry_continue(rq, &engine->timeline.requests, link)
+ if (rq->gem_context == hung_ctx)
+ i915_request_skip(rq, -EIO);
+
+ list_for_each_entry(rq, &timeline->requests, link)
+ i915_request_skip(rq, -EIO);
+
+ spin_unlock(&timeline->lock);
+ spin_unlock_irqrestore(&engine->timeline.lock, flags);
+}
+
+static void client_mark_guilty(struct drm_i915_file_private *file_priv,
+ const struct i915_gem_context *ctx)
+{
+ unsigned int score;
+ unsigned long prev_hang;
+
+ if (i915_gem_context_is_banned(ctx))
+ score = I915_CLIENT_SCORE_CONTEXT_BAN;
+ else
+ score = 0;
+
+ prev_hang = xchg(&file_priv->hang_timestamp, jiffies);
+ if (time_before(jiffies, prev_hang + I915_CLIENT_FAST_HANG_JIFFIES))
+ score += I915_CLIENT_SCORE_HANG_FAST;
+
+ if (score) {
+ atomic_add(score, &file_priv->ban_score);
+
+ DRM_DEBUG_DRIVER("client %s: gained %u ban score, now %u\n",
+ ctx->name, score,
+ atomic_read(&file_priv->ban_score));
+ }
+}
+
+static void context_mark_guilty(struct i915_gem_context *ctx)
+{
+ unsigned int score;
+ bool banned, bannable;
+
+ atomic_inc(&ctx->guilty_count);
+
+ bannable = i915_gem_context_is_bannable(ctx);
+ score = atomic_add_return(CONTEXT_SCORE_GUILTY, &ctx->ban_score);
+ banned = score >= CONTEXT_SCORE_BAN_THRESHOLD;
+
+ /* Cool contexts don't accumulate client ban score */
+ if (!bannable)
+ return;
+
+ if (banned) {
+ DRM_DEBUG_DRIVER("context %s: guilty %d, score %u, banned\n",
+ ctx->name, atomic_read(&ctx->guilty_count),
+ score);
+ i915_gem_context_set_banned(ctx);
+ }
+
+ if (!IS_ERR_OR_NULL(ctx->file_priv))
+ client_mark_guilty(ctx->file_priv, ctx);
+}
+
+static void context_mark_innocent(struct i915_gem_context *ctx)
+{
+ atomic_inc(&ctx->active_count);
+}
+
+static void gen3_stop_engine(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *dev_priv = engine->i915;
+ const u32 base = engine->mmio_base;
+
+ if (intel_engine_stop_cs(engine))
+ DRM_DEBUG_DRIVER("%s: timed out on STOP_RING\n", engine->name);
+
+ I915_WRITE_FW(RING_HEAD(base), I915_READ_FW(RING_TAIL(base)));
+ POSTING_READ_FW(RING_HEAD(base)); /* paranoia */
+
+ I915_WRITE_FW(RING_HEAD(base), 0);
+ I915_WRITE_FW(RING_TAIL(base), 0);
+ POSTING_READ_FW(RING_TAIL(base));
+
+ /* The ring must be empty before it is disabled */
+ I915_WRITE_FW(RING_CTL(base), 0);
+
+ /* Check acts as a post */
+ if (I915_READ_FW(RING_HEAD(base)) != 0)
+ DRM_DEBUG_DRIVER("%s: ring head not parked\n",
+ engine->name);
+}
+
+static void i915_stop_engines(struct drm_i915_private *i915,
+ unsigned int engine_mask)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ if (INTEL_GEN(i915) < 3)
+ return;
+
+ for_each_engine_masked(engine, i915, engine_mask, id)
+ gen3_stop_engine(engine);
+}
+
+static bool i915_in_reset(struct pci_dev *pdev)
+{
+ u8 gdrst;
+
+ pci_read_config_byte(pdev, I915_GDRST, &gdrst);
+ return gdrst & GRDOM_RESET_STATUS;
+}
+
+static int i915_do_reset(struct drm_i915_private *i915,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct pci_dev *pdev = i915->drm.pdev;
+ int err;
+
+ /* Assert reset for at least 20 usec, and wait for acknowledgement. */
+ pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
+ usleep_range(50, 200);
+ err = wait_for(i915_in_reset(pdev), 500);
+
+ /* Clear the reset request. */
+ pci_write_config_byte(pdev, I915_GDRST, 0);
+ usleep_range(50, 200);
+ if (!err)
+ err = wait_for(!i915_in_reset(pdev), 500);
+
+ return err;
+}
+
+static bool g4x_reset_complete(struct pci_dev *pdev)
+{
+ u8 gdrst;
+
+ pci_read_config_byte(pdev, I915_GDRST, &gdrst);
+ return (gdrst & GRDOM_RESET_ENABLE) == 0;
+}
+
+static int g33_do_reset(struct drm_i915_private *i915,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct pci_dev *pdev = i915->drm.pdev;
+
+ pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
+ return wait_for(g4x_reset_complete(pdev), 500);
+}
+
+static int g4x_do_reset(struct drm_i915_private *dev_priv,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct pci_dev *pdev = dev_priv->drm.pdev;
+ int ret;
+
+ /* WaVcpClkGateDisableForMediaReset:ctg,elk */
+ I915_WRITE(VDECCLK_GATE_D,
+ I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
+ POSTING_READ(VDECCLK_GATE_D);
+
+ pci_write_config_byte(pdev, I915_GDRST,
+ GRDOM_MEDIA | GRDOM_RESET_ENABLE);
+ ret = wait_for(g4x_reset_complete(pdev), 500);
+ if (ret) {
+ DRM_DEBUG_DRIVER("Wait for media reset failed\n");
+ goto out;
+ }
+
+ pci_write_config_byte(pdev, I915_GDRST,
+ GRDOM_RENDER | GRDOM_RESET_ENABLE);
+ ret = wait_for(g4x_reset_complete(pdev), 500);
+ if (ret) {
+ DRM_DEBUG_DRIVER("Wait for render reset failed\n");
+ goto out;
+ }
+
+out:
+ pci_write_config_byte(pdev, I915_GDRST, 0);
+
+ I915_WRITE(VDECCLK_GATE_D,
+ I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
+ POSTING_READ(VDECCLK_GATE_D);
+
+ return ret;
+}
+
+static int ironlake_do_reset(struct drm_i915_private *dev_priv,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ int ret;
+
+ I915_WRITE(ILK_GDSR, ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
+ ret = intel_wait_for_register(dev_priv,
+ ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
+ 500);
+ if (ret) {
+ DRM_DEBUG_DRIVER("Wait for render reset failed\n");
+ goto out;
+ }
+
+ I915_WRITE(ILK_GDSR, ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
+ ret = intel_wait_for_register(dev_priv,
+ ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
+ 500);
+ if (ret) {
+ DRM_DEBUG_DRIVER("Wait for media reset failed\n");
+ goto out;
+ }
+
+out:
+ I915_WRITE(ILK_GDSR, 0);
+ POSTING_READ(ILK_GDSR);
+ return ret;
+}
+
+/* Reset the hardware domains (GENX_GRDOM_*) specified by mask */
+static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
+ u32 hw_domain_mask)
+{
+ int err;
+
+ /*
+ * GEN6_GDRST is not in the gt power well, no need to check
+ * for fifo space for the write or forcewake the chip for
+ * the read
+ */
+ I915_WRITE_FW(GEN6_GDRST, hw_domain_mask);
+
+ /* Wait for the device to ack the reset requests */
+ err = __intel_wait_for_register_fw(dev_priv,
+ GEN6_GDRST, hw_domain_mask, 0,
+ 500, 0,
+ NULL);
+ if (err)
+ DRM_DEBUG_DRIVER("Wait for 0x%08x engines reset failed\n",
+ hw_domain_mask);
+
+ return err;
+}
+
+static int gen6_reset_engines(struct drm_i915_private *i915,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct intel_engine_cs *engine;
+ const u32 hw_engine_mask[I915_NUM_ENGINES] = {
+ [RCS] = GEN6_GRDOM_RENDER,
+ [BCS] = GEN6_GRDOM_BLT,
+ [VCS] = GEN6_GRDOM_MEDIA,
+ [VCS2] = GEN8_GRDOM_MEDIA2,
+ [VECS] = GEN6_GRDOM_VECS,
+ };
+ u32 hw_mask;
+
+ if (engine_mask == ALL_ENGINES) {
+ hw_mask = GEN6_GRDOM_FULL;
+ } else {
+ unsigned int tmp;
+
+ hw_mask = 0;
+ for_each_engine_masked(engine, i915, engine_mask, tmp)
+ hw_mask |= hw_engine_mask[engine->id];
+ }
+
+ return gen6_hw_domain_reset(i915, hw_mask);
+}
+
+static int gen11_reset_engines(struct drm_i915_private *i915,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct intel_engine_cs *engine;
+ const u32 hw_engine_mask[I915_NUM_ENGINES] = {
+ [RCS] = GEN11_GRDOM_RENDER,
+ [BCS] = GEN11_GRDOM_BLT,
+ [VCS] = GEN11_GRDOM_MEDIA,
+ [VCS2] = GEN11_GRDOM_MEDIA2,
+ [VCS3] = GEN11_GRDOM_MEDIA3,
+ [VCS4] = GEN11_GRDOM_MEDIA4,
+ [VECS] = GEN11_GRDOM_VECS,
+ [VECS2] = GEN11_GRDOM_VECS2,
+ };
+ u32 hw_mask;
+
+ BUILD_BUG_ON(VECS2 + 1 != I915_NUM_ENGINES);
+
+ if (engine_mask == ALL_ENGINES) {
+ hw_mask = GEN11_GRDOM_FULL;
+ } else {
+ unsigned int tmp;
+
+ hw_mask = 0;
+ for_each_engine_masked(engine, i915, engine_mask, tmp)
+ hw_mask |= hw_engine_mask[engine->id];
+ }
+
+ return gen6_hw_domain_reset(i915, hw_mask);
+}
+
+static int gen8_engine_reset_prepare(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *dev_priv = engine->i915;
+ int ret;
+
+ I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
+ _MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
+
+ ret = __intel_wait_for_register_fw(dev_priv,
+ RING_RESET_CTL(engine->mmio_base),
+ RESET_CTL_READY_TO_RESET,
+ RESET_CTL_READY_TO_RESET,
+ 700, 0,
+ NULL);
+ if (ret)
+ DRM_ERROR("%s: reset request timeout\n", engine->name);
+
+ return ret;
+}
+
+static void gen8_engine_reset_cancel(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *dev_priv = engine->i915;
+
+ I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
+ _MASKED_BIT_DISABLE(RESET_CTL_REQUEST_RESET));
+}
+
+static int gen8_reset_engines(struct drm_i915_private *i915,
+ unsigned int engine_mask,
+ unsigned int retry)
+{
+ struct intel_engine_cs *engine;
+ const bool reset_non_ready = retry >= 1;
+ unsigned int tmp;
+ int ret;
+
+ for_each_engine_masked(engine, i915, engine_mask, tmp) {
+ ret = gen8_engine_reset_prepare(engine);
+ if (ret && !reset_non_ready)
+ goto skip_reset;
+
+ /*
+ * If this is not the first failed attempt to prepare,
+ * we decide to proceed anyway.
+ *
+ * By doing so we risk context corruption and with
+ * some gens (kbl), possible system hang if reset
+ * happens during active bb execution.
+ *
+ * We rather take context corruption instead of
+ * failed reset with a wedged driver/gpu. And
+ * active bb execution case should be covered by
+ * i915_stop_engines we have before the reset.
+ */
+ }
+
+ if (INTEL_GEN(i915) >= 11)
+ ret = gen11_reset_engines(i915, engine_mask, retry);
+ else
+ ret = gen6_reset_engines(i915, engine_mask, retry);
+
+skip_reset:
+ for_each_engine_masked(engine, i915, engine_mask, tmp)
+ gen8_engine_reset_cancel(engine);
+
+ return ret;
+}
+
+typedef int (*reset_func)(struct drm_i915_private *,
+ unsigned int engine_mask,
+ unsigned int retry);
+
+static reset_func intel_get_gpu_reset(struct drm_i915_private *i915)
+{
+ if (!i915_modparams.reset)
+ return NULL;
+
+ if (INTEL_GEN(i915) >= 8)
+ return gen8_reset_engines;
+ else if (INTEL_GEN(i915) >= 6)
+ return gen6_reset_engines;
+ else if (IS_GEN5(i915))
+ return ironlake_do_reset;
+ else if (IS_G4X(i915))
+ return g4x_do_reset;
+ else if (IS_G33(i915) || IS_PINEVIEW(i915))
+ return g33_do_reset;
+ else if (INTEL_GEN(i915) >= 3)
+ return i915_do_reset;
+ else
+ return NULL;
+}
+
+int intel_gpu_reset(struct drm_i915_private *i915, unsigned int engine_mask)
+{
+ reset_func reset = intel_get_gpu_reset(i915);
+ int retry;
+ int ret;
+
+ /*
+ * We want to perform per-engine reset from atomic context (e.g.
+ * softirq), which imposes the constraint that we cannot sleep.
+ * However, experience suggests that spending a bit of time waiting
+ * for a reset helps in various cases, so for a full-device reset
+ * we apply the opposite rule and wait if we want to. As we should
+ * always follow up a failed per-engine reset with a full device reset,
+ * being a little faster, stricter and more error prone for the
+ * atomic case seems an acceptable compromise.
+ *
+ * Unfortunately this leads to a bimodal routine, when the goal was
+ * to have a single reset function that worked for resetting any
+ * number of engines simultaneously.
+ */
+ might_sleep_if(engine_mask == ALL_ENGINES);
+
+ /*
+ * If the power well sleeps during the reset, the reset
+ * request may be dropped and never completes (causing -EIO).
+ */
+ intel_uncore_forcewake_get(i915, FORCEWAKE_ALL);
+ for (retry = 0; retry < 3; retry++) {
+ /*
+ * We stop engines, otherwise we might get failed reset and a
+ * dead gpu (on elk). Also as modern gpu as kbl can suffer
+ * from system hang if batchbuffer is progressing when
+ * the reset is issued, regardless of READY_TO_RESET ack.
+ * Thus assume it is best to stop engines on all gens
+ * where we have a gpu reset.
+ *
+ * WaKBLVECSSemaphoreWaitPoll:kbl (on ALL_ENGINES)
+ *
+ * WaMediaResetMainRingCleanup:ctg,elk (presumably)
+ *
+ * FIXME: Wa for more modern gens needs to be validated
+ */
+ i915_stop_engines(i915, engine_mask);
+
+ ret = -ENODEV;
+ if (reset) {
+ GEM_TRACE("engine_mask=%x\n", engine_mask);
+ ret = reset(i915, engine_mask, retry);
+ }
+ if (ret != -ETIMEDOUT || engine_mask != ALL_ENGINES)
+ break;
+
+ cond_resched();
+ }
+ intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
+
+ return ret;
+}
+
+bool intel_has_gpu_reset(struct drm_i915_private *i915)
+{
+ return intel_get_gpu_reset(i915);
+}
+
+bool intel_has_reset_engine(struct drm_i915_private *i915)
+{
+ return i915->info.has_reset_engine && i915_modparams.reset >= 2;
+}
+
+int intel_reset_guc(struct drm_i915_private *i915)
+{
+ u32 guc_domain =
+ INTEL_GEN(i915) >= 11 ? GEN11_GRDOM_GUC : GEN9_GRDOM_GUC;
+ int ret;
+
+ GEM_BUG_ON(!HAS_GUC(i915));
+
+ intel_uncore_forcewake_get(i915, FORCEWAKE_ALL);
+ ret = gen6_hw_domain_reset(i915, guc_domain);
+ intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
+
+ return ret;
+}
+
+/*
+ * Ensure irq handler finishes, and not run again.
+ * Also return the active request so that we only search for it once.
+ */
+static struct i915_request *
+reset_prepare_engine(struct intel_engine_cs *engine)
+{
+ struct i915_request *rq;
+
+ /*
+ * During the reset sequence, we must prevent the engine from
+ * entering RC6. As the context state is undefined until we restart
+ * the engine, if it does enter RC6 during the reset, the state
+ * written to the powercontext is undefined and so we may lose
+ * GPU state upon resume, i.e. fail to restart after a reset.
+ */
+ intel_uncore_forcewake_get(engine->i915, FORCEWAKE_ALL);
+
+ rq = engine->reset.prepare(engine);
+ if (rq && rq->fence.error == -EIO)
+ rq = ERR_PTR(-EIO); /* Previous reset failed! */
+
+ return rq;
+}
+
+static int reset_prepare(struct drm_i915_private *i915)
+{
+ struct intel_engine_cs *engine;
+ struct i915_request *rq;
+ enum intel_engine_id id;
+ int err = 0;
+
+ for_each_engine(engine, i915, id) {
+ rq = reset_prepare_engine(engine);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ continue;
+ }
+
+ engine->hangcheck.active_request = rq;
+ }
+
+ i915_gem_revoke_fences(i915);
+ intel_uc_sanitize(i915);
+
+ return err;
+}
+
+/* Returns the request if it was guilty of the hang */
+static struct i915_request *
+reset_request(struct intel_engine_cs *engine,
+ struct i915_request *rq,
+ bool stalled)
+{
+ /*
+ * The guilty request will get skipped on a hung engine.
+ *
+ * Users of client default contexts do not rely on logical
+ * state preserved between batches so it is safe to execute
+ * queued requests following the hang. Non default contexts
+ * rely on preserved state, so skipping a batch loses the
+ * evolution of the state and it needs to be considered corrupted.
+ * Executing more queued batches on top of corrupted state is
+ * risky. But we take the risk by trying to advance through
+ * the queued requests in order to make the client behaviour
+ * more predictable around resets, by not throwing away random
+ * amount of batches it has prepared for execution. Sophisticated
+ * clients can use gem_reset_stats_ioctl and dma fence status
+ * (exported via sync_file info ioctl on explicit fences) to observe
+ * when it loses the context state and should rebuild accordingly.
+ *
+ * The context ban, and ultimately the client ban, mechanism are safety
+ * valves if client submission ends up resulting in nothing more than
+ * subsequent hangs.
+ */
+
+ if (i915_request_completed(rq)) {
+ GEM_TRACE("%s pardoned global=%d (fence %llx:%d), current %d\n",
+ engine->name, rq->global_seqno,
+ rq->fence.context, rq->fence.seqno,
+ intel_engine_get_seqno(engine));
+ stalled = false;
+ }
+
+ if (stalled) {
+ context_mark_guilty(rq->gem_context);
+ i915_request_skip(rq, -EIO);
+
+ /* If this context is now banned, skip all pending requests. */
+ if (i915_gem_context_is_banned(rq->gem_context))
+ engine_skip_context(rq);
+ } else {
+ /*
+ * Since this is not the hung engine, it may have advanced
+ * since the hang declaration. Double check by refinding
+ * the active request at the time of the reset.
+ */
+ rq = i915_gem_find_active_request(engine);
+ if (rq) {
+ unsigned long flags;
+
+ context_mark_innocent(rq->gem_context);
+ dma_fence_set_error(&rq->fence, -EAGAIN);
+
+ /* Rewind the engine to replay the incomplete rq */
+ spin_lock_irqsave(&engine->timeline.lock, flags);
+ rq = list_prev_entry(rq, link);
+ if (&rq->link == &engine->timeline.requests)
+ rq = NULL;
+ spin_unlock_irqrestore(&engine->timeline.lock, flags);
+ }
+ }
+
+ return rq;
+}
+
+static void reset_engine(struct intel_engine_cs *engine,
+ struct i915_request *rq,
+ bool stalled)
+{
+ /*
+ * Make sure this write is visible before we re-enable the interrupt
+ * handlers on another CPU, as tasklet_enable() resolves to just
+ * a compiler barrier which is insufficient for our purpose here.
+ */
+ smp_store_mb(engine->irq_posted, 0);
+
+ if (rq)
+ rq = reset_request(engine, rq, stalled);
+
+ /* Setup the CS to resume from the breadcrumb of the hung request */
+ engine->reset.reset(engine, rq);
+}
+
+static void gt_reset(struct drm_i915_private *i915, unsigned int stalled_mask)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+
+ i915_retire_requests(i915);
+
+ for_each_engine(engine, i915, id) {
+ struct intel_context *ce;
+
+ reset_engine(engine,
+ engine->hangcheck.active_request,
+ stalled_mask & ENGINE_MASK(id));
+ ce = fetch_and_zero(&engine->last_retired_context);
+ if (ce)
+ intel_context_unpin(ce);
+
+ /*
+ * Ostensibily, we always want a context loaded for powersaving,
+ * so if the engine is idle after the reset, send a request
+ * to load our scratch kernel_context.
+ *
+ * More mysteriously, if we leave the engine idle after a reset,
+ * the next userspace batch may hang, with what appears to be
+ * an incoherent read by the CS (presumably stale TLB). An
+ * empty request appears sufficient to paper over the glitch.
+ */
+ if (intel_engine_is_idle(engine)) {
+ struct i915_request *rq;
+
+ rq = i915_request_alloc(engine, i915->kernel_context);
+ if (!IS_ERR(rq))
+ i915_request_add(rq);
+ }
+ }
+
+ i915_gem_restore_fences(i915);
+}
+
+static void reset_finish_engine(struct intel_engine_cs *engine)
+{
+ engine->reset.finish(engine);
+
+ intel_uncore_forcewake_put(engine->i915, FORCEWAKE_ALL);
+}
+
+static void reset_finish(struct drm_i915_private *i915)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+
+ for_each_engine(engine, i915, id) {
+ engine->hangcheck.active_request = NULL;
+ reset_finish_engine(engine);
+ }
+}
+
+static void nop_submit_request(struct i915_request *rq)
+{
+ GEM_TRACE("%s fence %llx:%d -> -EIO\n",
+ rq->engine->name, rq->fence.context, rq->fence.seqno);
+ dma_fence_set_error(&rq->fence, -EIO);
+
+ i915_request_submit(rq);
+}
+
+static void nop_complete_submit_request(struct i915_request *rq)
+{
+ unsigned long flags;
+
+ GEM_TRACE("%s fence %llx:%d -> -EIO\n",
+ rq->engine->name,
+ rq->fence.context, rq->fence.seqno);
+ dma_fence_set_error(&rq->fence, -EIO);
+
+ spin_lock_irqsave(&rq->engine->timeline.lock, flags);
+ __i915_request_submit(rq);
+ intel_engine_init_global_seqno(rq->engine, rq->global_seqno);
+ spin_unlock_irqrestore(&rq->engine->timeline.lock, flags);
+}
+
+void i915_gem_set_wedged(struct drm_i915_private *i915)
+{
+ struct i915_gpu_error *error = &i915->gpu_error;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ mutex_lock(&error->wedge_mutex);
+ if (test_bit(I915_WEDGED, &error->flags)) {
+ mutex_unlock(&error->wedge_mutex);
+ return;
+ }
+
+ if (GEM_SHOW_DEBUG()) {
+ struct drm_printer p = drm_debug_printer(__func__);
+
+ for_each_engine(engine, i915, id)
+ intel_engine_dump(engine, &p, "%s\n", engine->name);
+ }
+
+ GEM_TRACE("start\n");
+
+ /*
+ * First, stop submission to hw, but do not yet complete requests by
+ * rolling the global seqno forward (since this would complete requests
+ * for which we haven't set the fence error to EIO yet).
+ */
+ for_each_engine(engine, i915, id) {
+ reset_prepare_engine(engine);
+
+ engine->submit_request = nop_submit_request;
+ engine->schedule = NULL;
+ }
+ i915->caps.scheduler = 0;
+
+ /* Even if the GPU reset fails, it should still stop the engines */
+ if (INTEL_GEN(i915) >= 5)
+ intel_gpu_reset(i915, ALL_ENGINES);
+
+ /*
+ * Make sure no one is running the old callback before we proceed with
+ * cancelling requests and resetting the completion tracking. Otherwise
+ * we might submit a request to the hardware which never completes.
+ */
+ synchronize_rcu();
+
+ for_each_engine(engine, i915, id) {
+ /* Mark all executing requests as skipped */
+ engine->cancel_requests(engine);
+
+ /*
+ * Only once we've force-cancelled all in-flight requests can we
+ * start to complete all requests.
+ */
+ engine->submit_request = nop_complete_submit_request;
+ }
+
+ /*
+ * Make sure no request can slip through without getting completed by
+ * either this call here to intel_engine_init_global_seqno, or the one
+ * in nop_complete_submit_request.
+ */
+ synchronize_rcu();
+
+ for_each_engine(engine, i915, id) {
+ unsigned long flags;
+
+ /*
+ * Mark all pending requests as complete so that any concurrent
+ * (lockless) lookup doesn't try and wait upon the request as we
+ * reset it.
+ */
+ spin_lock_irqsave(&engine->timeline.lock, flags);
+ intel_engine_init_global_seqno(engine,
+ intel_engine_last_submit(engine));
+ spin_unlock_irqrestore(&engine->timeline.lock, flags);
+
+ reset_finish_engine(engine);
+ }
+
+ smp_mb__before_atomic();
+ set_bit(I915_WEDGED, &error->flags);
+
+ GEM_TRACE("end\n");
+ mutex_unlock(&error->wedge_mutex);
+
+ wake_up_all(&error->reset_queue);
+}
+
+bool i915_gem_unset_wedged(struct drm_i915_private *i915)
+{
+ struct i915_gpu_error *error = &i915->gpu_error;
+ struct i915_timeline *tl;
+ bool ret = false;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+
+ if (!test_bit(I915_WEDGED, &error->flags))
+ return true;
+
+ mutex_lock(&error->wedge_mutex);
+
+ GEM_TRACE("start\n");
+
+ /*
+ * Before unwedging, make sure that all pending operations
+ * are flushed and errored out - we may have requests waiting upon
+ * third party fences. We marked all inflight requests as EIO, and
+ * every execbuf since returned EIO, for consistency we want all
+ * the currently pending requests to also be marked as EIO, which
+ * is done inside our nop_submit_request - and so we must wait.
+ *
+ * No more can be submitted until we reset the wedged bit.
+ */
+ list_for_each_entry(tl, &i915->gt.timelines, link) {
+ struct i915_request *rq;
+
+ rq = i915_gem_active_peek(&tl->last_request,
+ &i915->drm.struct_mutex);
+ if (!rq)
+ continue;
+
+ /*
+ * We can't use our normal waiter as we want to
+ * avoid recursively trying to handle the current
+ * reset. The basic dma_fence_default_wait() installs
+ * a callback for dma_fence_signal(), which is
+ * triggered by our nop handler (indirectly, the
+ * callback enables the signaler thread which is
+ * woken by the nop_submit_request() advancing the seqno
+ * and when the seqno passes the fence, the signaler
+ * then signals the fence waking us up).
+ */
+ if (dma_fence_default_wait(&rq->fence, true,
+ MAX_SCHEDULE_TIMEOUT) < 0)
+ goto unlock;
+ }
+ i915_retire_requests(i915);
+ GEM_BUG_ON(i915->gt.active_requests);
+
+ if (!intel_gpu_reset(i915, ALL_ENGINES))
+ intel_engines_sanitize(i915);
+
+ /*
+ * Undo nop_submit_request. We prevent all new i915 requests from
+ * being queued (by disallowing execbuf whilst wedged) so having
+ * waited for all active requests above, we know the system is idle
+ * and do not have to worry about a thread being inside
+ * engine->submit_request() as we swap over. So unlike installing
+ * the nop_submit_request on reset, we can do this from normal
+ * context and do not require stop_machine().
+ */
+ intel_engines_reset_default_submission(i915);
+ i915_gem_contexts_lost(i915);
+
+ GEM_TRACE("end\n");
+
+ smp_mb__before_atomic(); /* complete takeover before enabling execbuf */
+ clear_bit(I915_WEDGED, &i915->gpu_error.flags);
+ ret = true;
+unlock:
+ mutex_unlock(&i915->gpu_error.wedge_mutex);
+
+ return ret;
+}
+
+/**
+ * i915_reset - reset chip after a hang
+ * @i915: #drm_i915_private to reset
+ * @stalled_mask: mask of the stalled engines with the guilty requests
+ * @reason: user error message for why we are resetting
+ *
+ * Reset the chip. Useful if a hang is detected. Marks the device as wedged
+ * on failure.
+ *
+ * Caller must hold the struct_mutex.
+ *
+ * Procedure is fairly simple:
+ * - reset the chip using the reset reg
+ * - re-init context state
+ * - re-init hardware status page
+ * - re-init ring buffer
+ * - re-init interrupt state
+ * - re-init display
+ */
+void i915_reset(struct drm_i915_private *i915,
+ unsigned int stalled_mask,
+ const char *reason)
+{
+ struct i915_gpu_error *error = &i915->gpu_error;
+ int ret;
+ int i;
+
+ GEM_TRACE("flags=%lx\n", error->flags);
+
+ might_sleep();
+ lockdep_assert_held(&i915->drm.struct_mutex);
+ GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
+
+ if (!test_bit(I915_RESET_HANDOFF, &error->flags))
+ return;
+
+ /* Clear any previous failed attempts at recovery. Time to try again. */
+ if (!i915_gem_unset_wedged(i915))
+ goto wakeup;
+
+ if (reason)
+ dev_notice(i915->drm.dev, "Resetting chip for %s\n", reason);
+ error->reset_count++;
+
+ ret = reset_prepare(i915);
+ if (ret) {
+ dev_err(i915->drm.dev, "GPU recovery failed\n");
+ goto taint;
+ }
+
+ if (!intel_has_gpu_reset(i915)) {
+ if (i915_modparams.reset)
+ dev_err(i915->drm.dev, "GPU reset not supported\n");
+ else
+ DRM_DEBUG_DRIVER("GPU reset disabled\n");
+ goto error;
+ }
+
+ for (i = 0; i < 3; i++) {
+ ret = intel_gpu_reset(i915, ALL_ENGINES);
+ if (ret == 0)
+ break;
+
+ msleep(100);
+ }
+ if (ret) {
+ dev_err(i915->drm.dev, "Failed to reset chip\n");
+ goto taint;
+ }
+
+ /* Ok, now get things going again... */
+
+ /*
+ * Everything depends on having the GTT running, so we need to start
+ * there.
+ */
+ ret = i915_ggtt_enable_hw(i915);
+ if (ret) {
+ DRM_ERROR("Failed to re-enable GGTT following reset (%d)\n",
+ ret);
+ goto error;
+ }
+
+ gt_reset(i915, stalled_mask);
+ intel_overlay_reset(i915);
+
+ /*
+ * Next we need to restore the context, but we don't use those
+ * yet either...
+ *
+ * Ring buffer needs to be re-initialized in the KMS case, or if X
+ * was running at the time of the reset (i.e. we weren't VT
+ * switched away).
+ */
+ ret = i915_gem_init_hw(i915);
+ if (ret) {
+ DRM_ERROR("Failed to initialise HW following reset (%d)\n",
+ ret);
+ goto error;
+ }
+
+ i915_queue_hangcheck(i915);
+
+finish:
+ reset_finish(i915);
+wakeup:
+ clear_bit(I915_RESET_HANDOFF, &error->flags);
+ wake_up_bit(&error->flags, I915_RESET_HANDOFF);
+ return;
+
+taint:
+ /*
+ * History tells us that if we cannot reset the GPU now, we
+ * never will. This then impacts everything that is run
+ * subsequently. On failing the reset, we mark the driver
+ * as wedged, preventing further execution on the GPU.
+ * We also want to go one step further and add a taint to the
+ * kernel so that any subsequent faults can be traced back to
+ * this failure. This is important for CI, where if the
+ * GPU/driver fails we would like to reboot and restart testing
+ * rather than continue on into oblivion. For everyone else,
+ * the system should still plod along, but they have been warned!
+ */
+ add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
+error:
+ i915_gem_set_wedged(i915);
+ i915_retire_requests(i915);
+ goto finish;
+}
+
+static inline int intel_gt_reset_engine(struct drm_i915_private *i915,
+ struct intel_engine_cs *engine)
+{
+ return intel_gpu_reset(i915, intel_engine_flag(engine));
+}
+
+/**
+ * i915_reset_engine - reset GPU engine to recover from a hang
+ * @engine: engine to reset
+ * @msg: reason for GPU reset; or NULL for no dev_notice()
+ *
+ * Reset a specific GPU engine. Useful if a hang is detected.
+ * Returns zero on successful reset or otherwise an error code.
+ *
+ * Procedure is:
+ * - identifies the request that caused the hang and it is dropped
+ * - reset engine (which will force the engine to idle)
+ * - re-init/configure engine
+ */
+int i915_reset_engine(struct intel_engine_cs *engine, const char *msg)
+{
+ struct i915_gpu_error *error = &engine->i915->gpu_error;
+ struct i915_request *active_request;
+ int ret;
+
+ GEM_TRACE("%s flags=%lx\n", engine->name, error->flags);
+ GEM_BUG_ON(!test_bit(I915_RESET_ENGINE + engine->id, &error->flags));
+
+ active_request = reset_prepare_engine(engine);
+ if (IS_ERR_OR_NULL(active_request)) {
+ /* Either the previous reset failed, or we pardon the reset. */
+ ret = PTR_ERR(active_request);
+ goto out;
+ }
+
+ if (msg)
+ dev_notice(engine->i915->drm.dev,
+ "Resetting %s for %s\n", engine->name, msg);
+ error->reset_engine_count[engine->id]++;
+
+ if (!engine->i915->guc.execbuf_client)
+ ret = intel_gt_reset_engine(engine->i915, engine);
+ else
+ ret = intel_guc_reset_engine(&engine->i915->guc, engine);
+ if (ret) {
+ /* If we fail here, we expect to fallback to a global reset */
+ DRM_DEBUG_DRIVER("%sFailed to reset %s, ret=%d\n",
+ engine->i915->guc.execbuf_client ? "GuC " : "",
+ engine->name, ret);
+ goto out;
+ }
+
+ /*
+ * The request that caused the hang is stuck on elsp, we know the
+ * active request and can drop it, adjust head to skip the offending
+ * request to resume executing remaining requests in the queue.
+ */
+ reset_engine(engine, active_request, true);
+
+ /*
+ * The engine and its registers (and workarounds in case of render)
+ * have been reset to their default values. Follow the init_ring
+ * process to program RING_MODE, HWSP and re-enable submission.
+ */
+ ret = engine->init_hw(engine);
+ if (ret)
+ goto out;
+
+out:
+ intel_engine_cancel_stop_cs(engine);
+ reset_finish_engine(engine);
+ return ret;
+}
+
+struct wedge_me {
+ struct delayed_work work;
+ struct drm_i915_private *i915;
+ const char *name;
+};
+
+static void wedge_me(struct work_struct *work)
+{
+ struct wedge_me *w = container_of(work, typeof(*w), work.work);
+
+ dev_err(w->i915->drm.dev,
+ "%s timed out, cancelling all in-flight rendering.\n",
+ w->name);
+ i915_gem_set_wedged(w->i915);
+}
+
+static void __init_wedge(struct wedge_me *w,
+ struct drm_i915_private *i915,
+ long timeout,
+ const char *name)
+{
+ w->i915 = i915;
+ w->name = name;
+
+ INIT_DELAYED_WORK_ONSTACK(&w->work, wedge_me);
+ schedule_delayed_work(&w->work, timeout);
+}
+
+static void __fini_wedge(struct wedge_me *w)
+{
+ cancel_delayed_work_sync(&w->work);
+ destroy_delayed_work_on_stack(&w->work);
+ w->i915 = NULL;
+}
+
+#define i915_wedge_on_timeout(W, DEV, TIMEOUT) \
+ for (__init_wedge((W), (DEV), (TIMEOUT), __func__); \
+ (W)->i915; \
+ __fini_wedge((W)))
+
+static void i915_reset_device(struct drm_i915_private *i915,
+ u32 engine_mask,
+ const char *reason)
+{
+ struct i915_gpu_error *error = &i915->gpu_error;
+ struct kobject *kobj = &i915->drm.primary->kdev->kobj;
+ char *error_event[] = { I915_ERROR_UEVENT "=1", NULL };
+ char *reset_event[] = { I915_RESET_UEVENT "=1", NULL };
+ char *reset_done_event[] = { I915_ERROR_UEVENT "=0", NULL };
+ struct wedge_me w;
+
+ kobject_uevent_env(kobj, KOBJ_CHANGE, error_event);
+
+ DRM_DEBUG_DRIVER("resetting chip\n");
+ kobject_uevent_env(kobj, KOBJ_CHANGE, reset_event);
+
+ /* Use a watchdog to ensure that our reset completes */
+ i915_wedge_on_timeout(&w, i915, 5 * HZ) {
+ intel_prepare_reset(i915);
+
+ error->reason = reason;
+ error->stalled_mask = engine_mask;
+
+ /* Signal that locked waiters should reset the GPU */
+ smp_mb__before_atomic();
+ set_bit(I915_RESET_HANDOFF, &error->flags);
+ wake_up_all(&error->wait_queue);
+
+ /*
+ * Wait for anyone holding the lock to wakeup, without
+ * blocking indefinitely on struct_mutex.
+ */
+ do {
+ if (mutex_trylock(&i915->drm.struct_mutex)) {
+ i915_reset(i915, engine_mask, reason);
+ mutex_unlock(&i915->drm.struct_mutex);
+ }
+ } while (wait_on_bit_timeout(&error->flags,
+ I915_RESET_HANDOFF,
+ TASK_UNINTERRUPTIBLE,
+ 1));
+
+ error->stalled_mask = 0;
+ error->reason = NULL;
+
+ intel_finish_reset(i915);
+ }
+
+ if (!test_bit(I915_WEDGED, &error->flags))
+ kobject_uevent_env(kobj, KOBJ_CHANGE, reset_done_event);
+}
+
+void i915_clear_error_registers(struct drm_i915_private *dev_priv)
+{
+ u32 eir;
+
+ if (!IS_GEN2(dev_priv))
+ I915_WRITE(PGTBL_ER, I915_READ(PGTBL_ER));
+
+ if (INTEL_GEN(dev_priv) < 4)
+ I915_WRITE(IPEIR, I915_READ(IPEIR));
+ else
+ I915_WRITE(IPEIR_I965, I915_READ(IPEIR_I965));
+
+ I915_WRITE(EIR, I915_READ(EIR));
+ eir = I915_READ(EIR);
+ if (eir) {
+ /*
+ * some errors might have become stuck,
+ * mask them.
+ */
+ DRM_DEBUG_DRIVER("EIR stuck: 0x%08x, masking\n", eir);
+ I915_WRITE(EMR, I915_READ(EMR) | eir);
+ I915_WRITE(IIR, I915_MASTER_ERROR_INTERRUPT);
+ }
+
+ if (INTEL_GEN(dev_priv) >= 8) {
+ I915_WRITE(GEN8_RING_FAULT_REG,
+ I915_READ(GEN8_RING_FAULT_REG) & ~RING_FAULT_VALID);
+ POSTING_READ(GEN8_RING_FAULT_REG);
+ } else if (INTEL_GEN(dev_priv) >= 6) {
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ for_each_engine(engine, dev_priv, id) {
+ I915_WRITE(RING_FAULT_REG(engine),
+ I915_READ(RING_FAULT_REG(engine)) &
+ ~RING_FAULT_VALID);
+ }
+ POSTING_READ(RING_FAULT_REG(dev_priv->engine[RCS]));
+ }
+}
+
+/**
+ * i915_handle_error - handle a gpu error
+ * @i915: i915 device private
+ * @engine_mask: mask representing engines that are hung
+ * @flags: control flags
+ * @fmt: Error message format string
+ *
+ * Do some basic checking of register state at error time and
+ * dump it to the syslog. Also call i915_capture_error_state() to make
+ * sure we get a record and make it available in debugfs. Fire a uevent
+ * so userspace knows something bad happened (should trigger collection
+ * of a ring dump etc.).
+ */
+void i915_handle_error(struct drm_i915_private *i915,
+ u32 engine_mask,
+ unsigned long flags,
+ const char *fmt, ...)
+{
+ struct intel_engine_cs *engine;
+ intel_wakeref_t wakeref;
+ unsigned int tmp;
+ char error_msg[80];
+ char *msg = NULL;
+
+ if (fmt) {
+ va_list args;
+
+ va_start(args, fmt);
+ vscnprintf(error_msg, sizeof(error_msg), fmt, args);
+ va_end(args);
+
+ msg = error_msg;
+ }
+
+ /*
+ * In most cases it's guaranteed that we get here with an RPM
+ * reference held, for example because there is a pending GPU
+ * request that won't finish until the reset is done. This
+ * isn't the case at least when we get here by doing a
+ * simulated reset via debugfs, so get an RPM reference.
+ */
+ wakeref = intel_runtime_pm_get(i915);
+
+ engine_mask &= INTEL_INFO(i915)->ring_mask;
+
+ if (flags & I915_ERROR_CAPTURE) {
+ i915_capture_error_state(i915, engine_mask, msg);
+ i915_clear_error_registers(i915);
+ }
+
+ /*
+ * Try engine reset when available. We fall back to full reset if
+ * single reset fails.
+ */
+ if (intel_has_reset_engine(i915) &&
+ !i915_terminally_wedged(&i915->gpu_error)) {
+ for_each_engine_masked(engine, i915, engine_mask, tmp) {
+ BUILD_BUG_ON(I915_RESET_MODESET >= I915_RESET_ENGINE);
+ if (test_and_set_bit(I915_RESET_ENGINE + engine->id,
+ &i915->gpu_error.flags))
+ continue;
+
+ if (i915_reset_engine(engine, msg) == 0)
+ engine_mask &= ~intel_engine_flag(engine);
+
+ clear_bit(I915_RESET_ENGINE + engine->id,
+ &i915->gpu_error.flags);
+ wake_up_bit(&i915->gpu_error.flags,
+ I915_RESET_ENGINE + engine->id);
+ }
+ }
+
+ if (!engine_mask)
+ goto out;
+
+ /* Full reset needs the mutex, stop any other user trying to do so. */
+ if (test_and_set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags)) {
+ wait_event(i915->gpu_error.reset_queue,
+ !test_bit(I915_RESET_BACKOFF,
+ &i915->gpu_error.flags));
+ goto out;
+ }
+
+ /* Prevent any other reset-engine attempt. */
+ for_each_engine(engine, i915, tmp) {
+ while (test_and_set_bit(I915_RESET_ENGINE + engine->id,
+ &i915->gpu_error.flags))
+ wait_on_bit(&i915->gpu_error.flags,
+ I915_RESET_ENGINE + engine->id,
+ TASK_UNINTERRUPTIBLE);
+ }
+
+ i915_reset_device(i915, engine_mask, msg);
+
+ for_each_engine(engine, i915, tmp) {
+ clear_bit(I915_RESET_ENGINE + engine->id,
+ &i915->gpu_error.flags);
+ }
+
+ clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
+ wake_up_all(&i915->gpu_error.reset_queue);
+
+out:
+ intel_runtime_pm_put(i915, wakeref);
+}
diff --git a/drivers/gpu/drm/i915/i915_reset.h b/drivers/gpu/drm/i915/i915_reset.h
new file mode 100644
index 000000000000..3ae7e25aa569
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_reset.h
@@ -0,0 +1,39 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2008-2018 Intel Corporation
+ */
+
+#ifndef I915_RESET_H
+#define I915_RESET_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+struct drm_i915_private;
+struct intel_engine_cs;
+struct intel_guc;
+
+__printf(4, 5)
+void i915_handle_error(struct drm_i915_private *i915,
+ u32 engine_mask,
+ unsigned long flags,
+ const char *fmt, ...);
+#define I915_ERROR_CAPTURE BIT(0)
+
+void i915_clear_error_registers(struct drm_i915_private *i915);
+
+void i915_reset(struct drm_i915_private *i915,
+ unsigned int stalled_mask,
+ const char *reason);
+int i915_reset_engine(struct intel_engine_cs *engine,
+ const char *reason);
+
+bool intel_has_gpu_reset(struct drm_i915_private *i915);
+bool intel_has_reset_engine(struct drm_i915_private *i915);
+
+int intel_gpu_reset(struct drm_i915_private *i915, u32 engine_mask);
+
+int intel_reset_guc(struct drm_i915_private *i915);
+
+#endif /* I915_RESET_H */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 35d43b34b6e1..11504a5dbd23 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -33,13 +33,7 @@
#include <linux/vgaarb.h>
#include <drm/drm_edid.h>
#include <drm/drmP.h>
-#include "intel_drv.h"
-#include "intel_frontbuffer.h"
#include <drm/i915_drm.h>
-#include "i915_drv.h"
-#include "i915_gem_clflush.h"
-#include "intel_dsi.h"
-#include "i915_trace.h"
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_helper.h>
@@ -50,6 +44,15 @@
#include <linux/dma_remapping.h>
#include <linux/reservation.h>
+#include "intel_drv.h"
+#include "intel_dsi.h"
+#include "intel_frontbuffer.h"
+
+#include "i915_drv.h"
+#include "i915_gem_clflush.h"
+#include "i915_reset.h"
+#include "i915_trace.h"
+
/* Primary plane formats for gen <= 3 */
static const uint32_t i8xx_primary_formats[] = {
DRM_FORMAT_C8,
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index ad42faf48c46..fa06a3c05a20 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -187,4 +187,7 @@ static inline void intel_guc_disable_msg(struct intel_guc *guc, u32 mask)
spin_unlock_irq(&guc->irq_lock);
}
+int intel_guc_reset_engine(struct intel_guc *guc,
+ struct intel_engine_cs *engine);
+
#endif
diff --git a/drivers/gpu/drm/i915/intel_hangcheck.c b/drivers/gpu/drm/i915/intel_hangcheck.c
index e26d05a46451..c94a46525b0e 100644
--- a/drivers/gpu/drm/i915/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/intel_hangcheck.c
@@ -23,6 +23,7 @@
*/
#include "i915_drv.h"
+#include "i915_reset.h"
static bool
ipehr_is_semaphore_wait(struct intel_engine_cs *engine, u32 ipehr)
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index b1b3e81b6e24..4b6dc81486c0 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -26,6 +26,7 @@
#include "intel_guc_submission.h"
#include "intel_guc.h"
#include "i915_drv.h"
+#include "i915_reset.h"
static void guc_free_load_err_log(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index e611dfb2543e..8077a53a1863 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1715,267 +1715,6 @@ int i915_reg_read_ioctl(struct drm_device *dev,
return ret;
}
-static void gen3_stop_engine(struct intel_engine_cs *engine)
-{
- struct drm_i915_private *dev_priv = engine->i915;
- const u32 base = engine->mmio_base;
-
- if (intel_engine_stop_cs(engine))
- DRM_DEBUG_DRIVER("%s: timed out on STOP_RING\n", engine->name);
-
- I915_WRITE_FW(RING_HEAD(base), I915_READ_FW(RING_TAIL(base)));
- POSTING_READ_FW(RING_HEAD(base)); /* paranoia */
-
- I915_WRITE_FW(RING_HEAD(base), 0);
- I915_WRITE_FW(RING_TAIL(base), 0);
- POSTING_READ_FW(RING_TAIL(base));
-
- /* The ring must be empty before it is disabled */
- I915_WRITE_FW(RING_CTL(base), 0);
-
- /* Check acts as a post */
- if (I915_READ_FW(RING_HEAD(base)) != 0)
- DRM_DEBUG_DRIVER("%s: ring head not parked\n",
- engine->name);
-}
-
-static void i915_stop_engines(struct drm_i915_private *dev_priv,
- unsigned int engine_mask)
-{
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- if (INTEL_GEN(dev_priv) < 3)
- return;
-
- for_each_engine_masked(engine, dev_priv, engine_mask, id)
- gen3_stop_engine(engine);
-}
-
-static bool i915_in_reset(struct pci_dev *pdev)
-{
- u8 gdrst;
-
- pci_read_config_byte(pdev, I915_GDRST, &gdrst);
- return gdrst & GRDOM_RESET_STATUS;
-}
-
-static int i915_do_reset(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- struct pci_dev *pdev = dev_priv->drm.pdev;
- int err;
-
- /* Assert reset for at least 20 usec, and wait for acknowledgement. */
- pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
- usleep_range(50, 200);
- err = wait_for(i915_in_reset(pdev), 500);
-
- /* Clear the reset request. */
- pci_write_config_byte(pdev, I915_GDRST, 0);
- usleep_range(50, 200);
- if (!err)
- err = wait_for(!i915_in_reset(pdev), 500);
-
- return err;
-}
-
-static bool g4x_reset_complete(struct pci_dev *pdev)
-{
- u8 gdrst;
-
- pci_read_config_byte(pdev, I915_GDRST, &gdrst);
- return (gdrst & GRDOM_RESET_ENABLE) == 0;
-}
-
-static int g33_do_reset(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- struct pci_dev *pdev = dev_priv->drm.pdev;
-
- pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
- return wait_for(g4x_reset_complete(pdev), 500);
-}
-
-static int g4x_do_reset(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- struct pci_dev *pdev = dev_priv->drm.pdev;
- int ret;
-
- /* WaVcpClkGateDisableForMediaReset:ctg,elk */
- I915_WRITE(VDECCLK_GATE_D,
- I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
- POSTING_READ(VDECCLK_GATE_D);
-
- pci_write_config_byte(pdev, I915_GDRST,
- GRDOM_MEDIA | GRDOM_RESET_ENABLE);
- ret = wait_for(g4x_reset_complete(pdev), 500);
- if (ret) {
- DRM_DEBUG_DRIVER("Wait for media reset failed\n");
- goto out;
- }
-
- pci_write_config_byte(pdev, I915_GDRST,
- GRDOM_RENDER | GRDOM_RESET_ENABLE);
- ret = wait_for(g4x_reset_complete(pdev), 500);
- if (ret) {
- DRM_DEBUG_DRIVER("Wait for render reset failed\n");
- goto out;
- }
-
-out:
- pci_write_config_byte(pdev, I915_GDRST, 0);
-
- I915_WRITE(VDECCLK_GATE_D,
- I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
- POSTING_READ(VDECCLK_GATE_D);
-
- return ret;
-}
-
-static int ironlake_do_reset(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- int ret;
-
- I915_WRITE(ILK_GDSR, ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
- ret = intel_wait_for_register(dev_priv,
- ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
- 500);
- if (ret) {
- DRM_DEBUG_DRIVER("Wait for render reset failed\n");
- goto out;
- }
-
- I915_WRITE(ILK_GDSR, ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
- ret = intel_wait_for_register(dev_priv,
- ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
- 500);
- if (ret) {
- DRM_DEBUG_DRIVER("Wait for media reset failed\n");
- goto out;
- }
-
-out:
- I915_WRITE(ILK_GDSR, 0);
- POSTING_READ(ILK_GDSR);
- return ret;
-}
-
-/* Reset the hardware domains (GENX_GRDOM_*) specified by mask */
-static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
- u32 hw_domain_mask)
-{
- int err;
-
- /* GEN6_GDRST is not in the gt power well, no need to check
- * for fifo space for the write or forcewake the chip for
- * the read
- */
- __raw_i915_write32(dev_priv, GEN6_GDRST, hw_domain_mask);
-
- /* Wait for the device to ack the reset requests */
- err = __intel_wait_for_register_fw(dev_priv,
- GEN6_GDRST, hw_domain_mask, 0,
- 500, 0,
- NULL);
- if (err)
- DRM_DEBUG_DRIVER("Wait for 0x%08x engines reset failed\n",
- hw_domain_mask);
-
- return err;
-}
-
-/**
- * gen6_reset_engines - reset individual engines
- * @dev_priv: i915 device
- * @engine_mask: mask of intel_ring_flag() engines or ALL_ENGINES for full reset
- * @retry: the count of of previous attempts to reset.
- *
- * This function will reset the individual engines that are set in engine_mask.
- * If you provide ALL_ENGINES as mask, full global domain reset will be issued.
- *
- * Note: It is responsibility of the caller to handle the difference between
- * asking full domain reset versus reset for all available individual engines.
- *
- * Returns 0 on success, nonzero on error.
- */
-static int gen6_reset_engines(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- struct intel_engine_cs *engine;
- const u32 hw_engine_mask[I915_NUM_ENGINES] = {
- [RCS] = GEN6_GRDOM_RENDER,
- [BCS] = GEN6_GRDOM_BLT,
- [VCS] = GEN6_GRDOM_MEDIA,
- [VCS2] = GEN8_GRDOM_MEDIA2,
- [VECS] = GEN6_GRDOM_VECS,
- };
- u32 hw_mask;
-
- if (engine_mask == ALL_ENGINES) {
- hw_mask = GEN6_GRDOM_FULL;
- } else {
- unsigned int tmp;
-
- hw_mask = 0;
- for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
- hw_mask |= hw_engine_mask[engine->id];
- }
-
- return gen6_hw_domain_reset(dev_priv, hw_mask);
-}
-
-/**
- * gen11_reset_engines - reset individual engines
- * @dev_priv: i915 device
- * @engine_mask: mask of intel_ring_flag() engines or ALL_ENGINES for full reset
- *
- * This function will reset the individual engines that are set in engine_mask.
- * If you provide ALL_ENGINES as mask, full global domain reset will be issued.
- *
- * Note: It is responsibility of the caller to handle the difference between
- * asking full domain reset versus reset for all available individual engines.
- *
- * Returns 0 on success, nonzero on error.
- */
-static int gen11_reset_engines(struct drm_i915_private *dev_priv,
- unsigned int engine_mask)
-{
- struct intel_engine_cs *engine;
- const u32 hw_engine_mask[I915_NUM_ENGINES] = {
- [RCS] = GEN11_GRDOM_RENDER,
- [BCS] = GEN11_GRDOM_BLT,
- [VCS] = GEN11_GRDOM_MEDIA,
- [VCS2] = GEN11_GRDOM_MEDIA2,
- [VCS3] = GEN11_GRDOM_MEDIA3,
- [VCS4] = GEN11_GRDOM_MEDIA4,
- [VECS] = GEN11_GRDOM_VECS,
- [VECS2] = GEN11_GRDOM_VECS2,
- };
- u32 hw_mask;
-
- BUILD_BUG_ON(VECS2 + 1 != I915_NUM_ENGINES);
-
- if (engine_mask == ALL_ENGINES) {
- hw_mask = GEN11_GRDOM_FULL;
- } else {
- unsigned int tmp;
-
- hw_mask = 0;
- for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
- hw_mask |= hw_engine_mask[engine->id];
- }
-
- return gen6_hw_domain_reset(dev_priv, hw_mask);
-}
-
/**
* __intel_wait_for_register_fw - wait until register matches expected state
* @dev_priv: the i915 device
@@ -2086,196 +1825,6 @@ int __intel_wait_for_register(struct drm_i915_private *dev_priv,
return ret;
}
-static int gen8_engine_reset_prepare(struct intel_engine_cs *engine)
-{
- struct drm_i915_private *dev_priv = engine->i915;
- int ret;
-
- I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
- _MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
-
- ret = __intel_wait_for_register_fw(dev_priv,
- RING_RESET_CTL(engine->mmio_base),
- RESET_CTL_READY_TO_RESET,
- RESET_CTL_READY_TO_RESET,
- 700, 0,
- NULL);
- if (ret)
- DRM_ERROR("%s: reset request timeout\n", engine->name);
-
- return ret;
-}
-
-static void gen8_engine_reset_cancel(struct intel_engine_cs *engine)
-{
- struct drm_i915_private *dev_priv = engine->i915;
-
- I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
- _MASKED_BIT_DISABLE(RESET_CTL_REQUEST_RESET));
-}
-
-static int reset_engines(struct drm_i915_private *i915,
- unsigned int engine_mask,
- unsigned int retry)
-{
- if (INTEL_GEN(i915) >= 11)
- return gen11_reset_engines(i915, engine_mask);
- else
- return gen6_reset_engines(i915, engine_mask, retry);
-}
-
-static int gen8_reset_engines(struct drm_i915_private *dev_priv,
- unsigned int engine_mask,
- unsigned int retry)
-{
- struct intel_engine_cs *engine;
- const bool reset_non_ready = retry >= 1;
- unsigned int tmp;
- int ret;
-
- for_each_engine_masked(engine, dev_priv, engine_mask, tmp) {
- ret = gen8_engine_reset_prepare(engine);
- if (ret && !reset_non_ready)
- goto skip_reset;
-
- /*
- * If this is not the first failed attempt to prepare,
- * we decide to proceed anyway.
- *
- * By doing so we risk context corruption and with
- * some gens (kbl), possible system hang if reset
- * happens during active bb execution.
- *
- * We rather take context corruption instead of
- * failed reset with a wedged driver/gpu. And
- * active bb execution case should be covered by
- * i915_stop_engines we have before the reset.
- */
- }
-
- ret = reset_engines(dev_priv, engine_mask, retry);
-
-skip_reset:
- for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
- gen8_engine_reset_cancel(engine);
-
- return ret;
-}
-
-typedef int (*reset_func)(struct drm_i915_private *,
- unsigned int engine_mask, unsigned int retry);
-
-static reset_func intel_get_gpu_reset(struct drm_i915_private *dev_priv)
-{
- if (!i915_modparams.reset)
- return NULL;
-
- if (INTEL_GEN(dev_priv) >= 8)
- return gen8_reset_engines;
- else if (INTEL_GEN(dev_priv) >= 6)
- return gen6_reset_engines;
- else if (IS_GEN5(dev_priv))
- return ironlake_do_reset;
- else if (IS_G4X(dev_priv))
- return g4x_do_reset;
- else if (IS_G33(dev_priv) || IS_PINEVIEW(dev_priv))
- return g33_do_reset;
- else if (INTEL_GEN(dev_priv) >= 3)
- return i915_do_reset;
- else
- return NULL;
-}
-
-int intel_gpu_reset(struct drm_i915_private *dev_priv,
- const unsigned int engine_mask)
-{
- reset_func reset = intel_get_gpu_reset(dev_priv);
- unsigned int retry;
- int ret;
-
- GEM_BUG_ON(!engine_mask);
-
- /*
- * We want to perform per-engine reset from atomic context (e.g.
- * softirq), which imposes the constraint that we cannot sleep.
- * However, experience suggests that spending a bit of time waiting
- * for a reset helps in various cases, so for a full-device reset
- * we apply the opposite rule and wait if we want to. As we should
- * always follow up a failed per-engine reset with a full device reset,
- * being a little faster, stricter and more error prone for the
- * atomic case seems an acceptable compromise.
- *
- * Unfortunately this leads to a bimodal routine, when the goal was
- * to have a single reset function that worked for resetting any
- * number of engines simultaneously.
- */
- might_sleep_if(engine_mask == ALL_ENGINES);
-
- /*
- * If the power well sleeps during the reset, the reset
- * request may be dropped and never completes (causing -EIO).
- */
- intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
- for (retry = 0; retry < 3; retry++) {
-
- /*
- * We stop engines, otherwise we might get failed reset and a
- * dead gpu (on elk). Also as modern gpu as kbl can suffer
- * from system hang if batchbuffer is progressing when
- * the reset is issued, regardless of READY_TO_RESET ack.
- * Thus assume it is best to stop engines on all gens
- * where we have a gpu reset.
- *
- * WaKBLVECSSemaphoreWaitPoll:kbl (on ALL_ENGINES)
- *
- * WaMediaResetMainRingCleanup:ctg,elk (presumably)
- *
- * FIXME: Wa for more modern gens needs to be validated
- */
- i915_stop_engines(dev_priv, engine_mask);
-
- ret = -ENODEV;
- if (reset) {
- ret = reset(dev_priv, engine_mask, retry);
- GEM_TRACE("engine_mask=%x, ret=%d, retry=%d\n",
- engine_mask, ret, retry);
- }
- if (ret != -ETIMEDOUT || engine_mask != ALL_ENGINES)
- break;
-
- cond_resched();
- }
- intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
-
- return ret;
-}
-
-bool intel_has_gpu_reset(struct drm_i915_private *dev_priv)
-{
- return intel_get_gpu_reset(dev_priv) != NULL;
-}
-
-bool intel_has_reset_engine(struct drm_i915_private *dev_priv)
-{
- return (dev_priv->info.has_reset_engine &&
- i915_modparams.reset >= 2);
-}
-
-int intel_reset_guc(struct drm_i915_private *dev_priv)
-{
- u32 guc_domain = INTEL_GEN(dev_priv) >= 11 ? GEN11_GRDOM_GUC :
- GEN9_GRDOM_GUC;
- int ret;
-
- GEM_BUG_ON(!HAS_GUC(dev_priv));
-
- intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
- ret = gen6_hw_domain_reset(dev_priv, guc_domain);
- intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
-
- return ret;
-}
-
bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv)
{
return check_for_unclaimed_mmio(dev_priv);
diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c
index 95f7e9364947..b6e11b58b3c9 100644
--- a/drivers/gpu/drm/i915/selftests/intel_lrc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c
@@ -4,6 +4,8 @@
* Copyright © 2018 Intel Corporation
*/
+#include "../i915_reset.h"
+
#include "../i915_selftest.h"
#include "igt_flush_test.h"
diff --git a/drivers/gpu/drm/i915/selftests/intel_workarounds.c b/drivers/gpu/drm/i915/selftests/intel_workarounds.c
index e2b542c6bfb1..6688bdd8b6eb 100644
--- a/drivers/gpu/drm/i915/selftests/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/selftests/intel_workarounds.c
@@ -5,6 +5,7 @@
*/
#include "../i915_selftest.h"
+#include "../i915_reset.h"
#include "igt_wedge_me.h"
#include "mock_context.h"
--
2.19.0
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