Having recently fixed a few ordering/lifetime bugs in this area, it
seems worthwhile putting a few more checks and warnings here, to provide
early detection of any future code changes that cause problems;
especially as we hope to rework the pinning/refcounting of the kernel
context soon.
Specifically, we want to check that teardown_status_page is called
*before* the underlying storage is freed, and that by the time
intel_logical_ring_cleanup() is called, the status page mapping have
already been released. We'll also take care to undo the status page
kmapping only if it has been set up.
Signed-off-by: Dave Gordon <david.s.gor...@intel.com>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_lrc.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 95ba8ec..b4deaca 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2003,6 +2003,9 @@ void intel_logical_ring_cleanup(struct intel_engine_cs
*ring)
i915_cmd_parser_fini_ring(ring);
i915_gem_batch_pool_fini(&ring->batch_pool);
+ /* Status page should have gone already */
+ WARN_ON(ring->status_page.page_addr);
+ WARN_ON(ring->status_page.obj);
ring->disable_lite_restore_wa = false;
ring->ctx_desc_template = 0;
@@ -2446,6 +2449,10 @@ void intel_lr_context_free(struct intel_context *ctx)
continue;
if (ctx == ctx->i915->kernel_context) {
+ /*
+ * The HWSP is part of the kernel context
+ * object in LRC mode, so tear it down *now*
+ */
lrc_teardown_hardware_status_page(ringbuf->ring);
intel_unpin_ringbuffer_obj(ringbuf);
i915_gem_object_ggtt_unpin(ctx_obj);
@@ -2517,12 +2524,19 @@ static void lrc_setup_hardware_status_page(struct
intel_engine_cs *ring)
POSTING_READ(RING_HWS_PGA(ring->mmio_base));
}
+/* This should be called *before* the default context is destroyed */
static void lrc_teardown_hardware_status_page(struct intel_engine_cs *ring)
{
- if (ring->status_page.obj) {
+ struct drm_i915_gem_object *dctx_obj = ring->status_page.obj;
+
+ WARN_ON(!dctx_obj);
+
+ if (ring->status_page.page_addr) {
kunmap(kmap_to_page(ring->status_page.page_addr));
- ring->status_page.obj = NULL;
+ ring->status_page.page_addr = NULL;
}
+
+ ring->status_page.obj = NULL;
}
/**
--
1.9.1
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