[PATCH 5.7 016/112] drm/i915/gt: Mark timeline->cacheline as destroyed after rcu grace period

Greg Kroah-Hartman
2020-07-07T15:23:01Z

From: Chris Wilson <chris@chris-wilson.co.uk>

[ Upstream commit 8e87e0139aff59c5961347ab1ef06814f092c439 ]

Since we take advantage of RCU for some i915_active objects, like the
intel_timeline_cacheline, we need to delay the i915_active_fini until
after the RCU grace period and we perform the kfree -- that is until
after all RCU protected readers.

<3> [108.204873] ODEBUG: assert_init not available (active state 0) object type: i915_active hint: __cacheline_active+0x0/0x80 [i915]
<4> [108.207377] WARNING: CPU: 3 PID: 2342 at lib/debugobjects.c:488 debug_print_object+0x67/0x90
<4> [108.207400] Modules linked in: vgem snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_intel_dspcfg snd_hda_codec ax88179_178a snd_hwdep usbnet btusb snd_hda_core btrtl mii btbcm btintel snd_pcm bluetooth ecdh_generic ecc i915 i2c_hid pinctrl_sunrisepoint pinctrl_intel intel_lpss_pci prime_numbers
<4> [108.207587] CPU: 3 PID: 2342 Comm: gem_exec_parall Tainted: G U 5.6.0-rc6-CI-Patchwork_17047+ #1
<4> [108.207609] Hardware name: Google Soraka/Soraka, BIOS MrChromebox-4.10 08/25/2019
<4> [108.207639] RIP: 0010:debug_print_object+0x67/0x90
<4> [108.207668] Code: 83 c2 01 8b 4b 14 4c 8b 45 00 89 15 87 d2 8a 02 8b 53 10 4c 89 e6 48 c7 c7 38 2b 32 82 48 8b 14 d5 80 2f 07 82 e8 49 d5 b7 ff <0f> 0b 5b 83 05 c3 f6 22 01 01 5d 41 5c c3 83 05 b8 f6 22 01 01 c3
<4> [108.207692] RSP: 0018:ffffc90000e7f890 EFLAGS: 00010282
<4> [108.207723] RAX: 0000000000000000 RBX: ffffc90000e7f8b0 RCX: 0000000000000001
<4> [108.207747] RDX: 0000000080000001 RSI: ffff88817ada8cb8 RDI: 00000000ffffffff
<4> [108.207770] RBP: ffffffffa0341cc0 R08: ffff88816b5a8948 R09: 0000000000000000
<4> [108.207792] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82322d54
<4> [108.207814] R13: ffffffffa0341cc0 R14: ffffffff83df9568 R15: ffff88816064f400
<4> [108.207839] FS: 00007f437d753700(0000) GS:ffff88817ad80000(0000) knlGS:0000000000000000
<4> [108.207863] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [108.207887] CR2: 00007f2ad1fb5000 CR3: 00000001725d8004 CR4: 00000000003606e0
<4> [108.207907] Call Trace:
<4> [108.207959] debug_object_assert_init+0x15c/0x180
<4> [108.208475] ? i915_active_acquire_if_busy+0x10/0x50 [i915]
<4> [108.208513] ? rcu_read_lock_held+0x4d/0x60
<4> [108.208970] i915_active_acquire_if_busy+0x10/0x50 [i915]
<4> [108.209380] intel_timeline_read_hwsp+0x81/0x540 [i915]
<4> [108.210262] __emit_semaphore_wait+0x45/0x1b0 [i915]
<4> [108.210726] ? i915_request_await_dma_fence+0x143/0x560 [i915]
<4> [108.211156] i915_request_await_dma_fence+0x28a/0x560 [i915]
<4> [108.211633] i915_request_await_object+0x24a/0x3f0 [i915]
<4> [108.212102] eb_submit.isra.47+0x58f/0x920 [i915]
<4> [108.212622] i915_gem_do_execbuffer+0x1706/0x2c70 [i915]
<4> [108.213071] ? i915_gem_execbuffer2_ioctl+0xc0/0x470 [i915]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323092841.22240-1-chris@chris-wilson.co.uk
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/gt/intel_timeline.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index 08b56d7ab4f45..92da746f01c1e 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -119,6 +119,15 @@ static void __idle_hwsp_free(struct intel_timeline_hwsp *hwsp, int cacheline)
spin_unlock_irqrestore(&gt->hwsp_lock, flags);
}

+static void __rcu_cacheline_free(struct rcu_head *rcu)
+{
+ struct intel_timeline_cacheline *cl =
+ container_of(rcu, typeof(*cl), rcu);
+
+ i915_active_fini(&cl->active);
+ kfree(cl);
+}
+
static void __idle_cacheline_free(struct intel_timeline_cacheline *cl)
{
GEM_BUG_ON(!i915_active_is_idle(&cl->active));
@@ -127,8 +136,7 @@ static void __idle_cacheline_free(struct intel_timeline_cacheline *cl)
i915_vma_put(cl->hwsp->vma);
__idle_hwsp_free(cl->hwsp, ptr_unmask_bits(cl->vaddr, CACHELINE_BITS));

- i915_active_fini(&cl->active);
- kfree_rcu(cl, rcu);
+ call_rcu(&cl->rcu, __rcu_cacheline_free);
}

__i915_active_call
--
2.25.1