From: Chris Wilson chris.p.wilson@intel.com
commit 31a2e6cbe8a4eb0d1650fff4b77872b744e14a62 upstream.
If the ring is nearly full when calling into emit_pte(), we might incorrectly trample the reserved_space when constructing the packet to emit the PTEs. This then triggers the GEM_BUG_ON(rq->reserved_space > ring->space) when later submitting the request, since the request itself doesn't have enough space left in the ring to emit things like workarounds, breadcrumbs etc.
v2: Fix the whitespace errors
Testcase: igt@i915_selftests@live_emit_pte_full_ring Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7535 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6889 Fixes: cf586021642d ("drm/i915/gt: Pipelined page migration") Signed-off-by: Chris Wilson chris.p.wilson@intel.com Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Andrzej Hajda andrzej.hajda@intel.com Cc: Andi Shyti andi.shyti@linux.intel.com Cc: Nirmoy Das nirmoy.das@intel.com Cc: stable@vger.kernel.org # v5.15+ Tested-by: Nirmoy Das nirmoy.das@intel.com Reviewed-by: Nirmoy Das nirmoy.das@intel.com Reviewed-by: Andrzej Hajda andrzej.hajda@intel.com Reviewed-by: Andi Shyti andi.shyti@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20221202122844.428006-1-matthe... (cherry picked from commit 35168a6c4ed53db4f786858bac23b1474fd7d0dc) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/gt/intel_migrate.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c @@ -341,6 +341,16 @@ static int emit_no_arbitration(struct i9 return 0; }
+static int max_pte_pkt_size(struct i915_request *rq, int pkt) +{ + struct intel_ring *ring = rq->ring; + + pkt = min_t(int, pkt, (ring->space - rq->reserved_space) / sizeof(u32) + 5); + pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5); + + return pkt; +} + static int emit_pte(struct i915_request *rq, struct sgt_dma *it, enum i915_cache_level cache_level, @@ -387,8 +397,7 @@ static int emit_pte(struct i915_request return PTR_ERR(cs);
/* Pack as many PTE updates as possible into a single MI command */ - pkt = min_t(int, dword_length, ring->space / sizeof(u32) + 5); - pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5); + pkt = max_pte_pkt_size(rq, dword_length);
hdr = cs; *cs++ = MI_STORE_DATA_IMM | REG_BIT(21); /* as qword elements */ @@ -421,8 +430,7 @@ static int emit_pte(struct i915_request } }
- pkt = min_t(int, dword_rem, ring->space / sizeof(u32) + 5); - pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5); + pkt = max_pte_pkt_size(rq, dword_rem);
hdr = cs; *cs++ = MI_STORE_DATA_IMM | REG_BIT(21);