drm/i915: Flush TLBs before releasing backing store
commit 7938d61591d33394a21bdd7797a245b65428f44c upstream.
We need to flush TLBs before releasing backing store otherwise userspace
is able to encounter stale entries if a) it is not declaring access to
certain buffers and b) it races with the backing store release from a
such undeclared execution already executing on the GPU in parallel.
The approach taken is to mark any buffer objects which were ever bound
to the GPU and to trigger a serialized TLB flush when their backing
store is released.
Alternatively the flushing could be done on VMA unbind, at which point
we would be able to ascertain whether there is potential a parallel GPU
execution (which could race), but essentially it boils down to paying
the cost of TLB flushes potentially needlessly at VMA unbind time (when
the backing store is not known to be going away so not needed for
safety), versus potentially needlessly at backing store relase time
(since we at that point cannot tell whether there is anything executing
on the GPU which uses that object).
Thereforce simplicity of implementation has been chosen for now with
scope to benchmark and refine later as required.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reported-by: Sushma Venkatesh Reddy <sushma.venkatesh.reddy@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Dave Airlie <airlied@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c4f1556..14cd0a7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1763,6 +1763,8 @@
struct intel_uncore uncore;
+ struct mutex tlb_invalidate_lock;
+
struct i915_virtual_gpu vgpu;
struct intel_gvt gvt;
@@ -2211,7 +2213,8 @@
* rendering and so a non-zero seqno), and is not set if it i s on
* inactive (ready to be unbound) list.
*/
-#define I915_BO_ACTIVE_SHIFT 0
+#define I915_BO_WAS_BOUND_BIT 0
+#define I915_BO_ACTIVE_SHIFT 1
#define I915_BO_ACTIVE_MASK ((1 << I915_NUM_ENGINES) - 1)
#define __I915_BO_ACTIVE(bo) \
((READ_ONCE((bo)->flags) >> I915_BO_ACTIVE_SHIFT) & I915_BO_ACTIVE_MASK)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3fb4f9a..9265ac5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2185,6 +2185,67 @@
kfree(obj->pages);
}
+static int
+__intel_wait_for_register_fw(struct drm_i915_private *dev_priv,
+ i915_reg_t reg,
+ const u32 mask,
+ const u32 value,
+ const unsigned int timeout_us,
+ const unsigned int timeout_ms)
+{
+#define done ((I915_READ_FW(reg) & mask) == value)
+ int ret = wait_for_us(done, timeout_us);
+ if (ret)
+ ret = wait_for(done, timeout_ms);
+ return ret;
+#undef done
+}
+
+static void invalidate_tlbs(struct drm_i915_private *dev_priv)
+{
+ static const i915_reg_t gen8_regs[] = {
+ [RCS] = GEN8_RTCR,
+ [VCS] = GEN8_M1TCR,
+ [VCS2] = GEN8_M2TCR,
+ [VECS] = GEN8_VTCR,
+ [BCS] = GEN8_BTCR,
+ };
+ struct intel_engine_cs *engine;
+
+ if (INTEL_GEN(dev_priv) < 8)
+ return;
+
+ assert_rpm_wakelock_held(dev_priv);
+
+ mutex_lock(&dev_priv->tlb_invalidate_lock);
+ intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+
+ for_each_engine(engine, dev_priv) {
+ /*
+ * HW architecture suggest typical invalidation time at 40us,
+ * with pessimistic cases up to 100us and a recommendation to
+ * cap at 1ms. We go a bit higher just in case.
+ */
+ const unsigned int timeout_us = 100;
+ const unsigned int timeout_ms = 4;
+ const enum intel_engine_id id = engine->id;
+
+ if (WARN_ON_ONCE(id >= ARRAY_SIZE(gen8_regs) ||
+ !i915_mmio_reg_offset(gen8_regs[id])))
+ continue;
+
+ I915_WRITE_FW(gen8_regs[id], 1);
+ if (__intel_wait_for_register_fw(dev_priv,
+ gen8_regs[id], 1, 0,
+ timeout_us, timeout_ms))
+ DRM_ERROR_RATELIMITED("%s TLB invalidation did not complete in %ums!\n",
+ engine->name, timeout_ms);
+ }
+
+ intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+ mutex_unlock(&dev_priv->tlb_invalidate_lock);
+}
+
int
i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
{
@@ -2215,6 +2276,15 @@
obj->mapping = NULL;
}
+ if (test_and_clear_bit(I915_BO_WAS_BOUND_BIT, &obj->flags)) {
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+
+ if (intel_runtime_pm_get_if_in_use(i915)) {
+ invalidate_tlbs(i915);
+ intel_runtime_pm_put(i915);
+ }
+ }
+
ops->put_pages(obj);
obj->pages = NULL;
@@ -4627,6 +4697,8 @@
atomic_set(&dev_priv->mm.bsd_engine_dispatch_index, 0);
+ mutex_init(&dev_priv->tlb_invalidate_lock);
+
spin_lock_init(&dev_priv->fb_tracking.lock);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 16f56f1..edaff73 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3685,6 +3685,10 @@
return ret;
vma->flags |= bind_flags;
+
+ if (vma->obj)
+ set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags);
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5468e69..1ff1e33 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1698,6 +1698,12 @@
#define GAMT_CHKN_BIT_REG _MMIO(0x4ab8)
#define GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING (1<<28)
+#define GEN8_RTCR _MMIO(0x4260)
+#define GEN8_M1TCR _MMIO(0x4264)
+#define GEN8_M2TCR _MMIO(0x4268)
+#define GEN8_BTCR _MMIO(0x426c)
+#define GEN8_VTCR _MMIO(0x4270)
+
#if 0
#define PRB0_TAIL _MMIO(0x2030)
#define PRB0_HEAD _MMIO(0x2034)