From: Tvrtko Ursulin tvrtko.ursulin@intel.com

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 --- drivers/gpu/drm/i915/i915_drv.h | 5 ++ drivers/gpu/drm/i915/i915_gem.c | 89 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_gem_gtt.c | 3 + drivers/gpu/drm/i915/i915_reg.h | 6 ++ 4 files changed, 103 insertions(+)

--- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1719,6 +1719,8 @@ struct drm_i915_private {

struct intel_uncore uncore;

+ struct mutex tlb_invalidate_lock; + struct i915_virtual_gpu vgpu;

struct intel_guc guc; @@ -2066,6 +2068,9 @@ struct drm_i915_gem_object { */ unsigned int active:I915_NUM_RINGS;

+ unsigned long flags; +#define I915_BO_WAS_BOUND_BIT 0 + /** * This is set if the object has been written to since last bound * to the GTT --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2212,6 +2212,85 @@ i915_gem_object_put_pages_gtt(struct drm kfree(obj->pages); }

+#define _wait_for_us(COND, US, W) ({ \ + unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \ + int ret__; \ + for (;;) { \ + bool expired__ = time_after(jiffies, timeout__); \ + if (COND) { \ + ret__ = 0; \ + break; \ + } \ + if (expired__) { \ + ret__ = -ETIMEDOUT; \ + break; \ + } \ + usleep_range((W), (W)*2); \ + } \ + ret__; \ +}) + +static int +__intel_wait_for_register_fw(struct drm_i915_private *dev_priv, + u32 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, 2); + if (ret) + ret = wait_for(done, timeout_ms); + return ret; +#undef done +} + +static void invalidate_tlbs(struct drm_i915_private *dev_priv) +{ + static const u32 gen8_regs[] = { + [RCS] = GEN8_RTCR, + [VCS] = GEN8_M1TCR, + [VCS2] = GEN8_M2TCR, + [VECS] = GEN8_VTCR, + [BCS] = GEN8_BTCR, + }; + enum intel_ring_id id; + + if (INTEL_INFO(dev_priv)->gen < 8) + return; + + mutex_lock(&dev_priv->tlb_invalidate_lock); + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); + + for (id = 0; id < I915_NUM_RINGS; id++) { + struct intel_engine_cs *engine = &dev_priv->ring[id]; + /* + * 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; + + if (!intel_ring_initialized(engine)) + continue; + + if (WARN_ON_ONCE(id >= ARRAY_SIZE(gen8_regs) || !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) { @@ -2230,6 +2309,14 @@ i915_gem_object_put_pages(struct drm_i91 * lists early. */ list_del(&obj->global_list);

+ if (test_and_clear_bit(I915_BO_WAS_BOUND_BIT, &obj->flags)) { + struct drm_i915_private *i915 = to_i915(obj->base.dev); + + intel_runtime_pm_get(i915); + invalidate_tlbs(i915); + intel_runtime_pm_put(i915); + } + ops->put_pages(obj); obj->pages = NULL;

@@ -5050,6 +5137,8 @@ i915_gem_load(struct drm_device *dev) i915_gem_shrinker_init(dev_priv);

mutex_init(&dev_priv->fb_tracking.lock); + + mutex_init(&dev_priv->tlb_invalidate_lock); }

void i915_gem_release(struct drm_device *dev, struct drm_file *file) --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3538,6 +3538,9 @@ int i915_vma_bind(struct i915_vma *vma,

vma->bound |= bind_flags;

+ if (vma->obj) + set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags); + return 0; }

--- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1592,6 +1592,12 @@ enum skl_disp_power_wells {

#define GEN7_TLB_RD_ADDR 0x4700

+#define GEN8_RTCR 0x4260 +#define GEN8_M1TCR 0x4264 +#define GEN8_M2TCR 0x4268 +#define GEN8_BTCR 0x426c +#define GEN8_VTCR 0x4270 + #if 0 #define PRB0_TAIL 0x02030 #define PRB0_HEAD 0x02034