6.12-stable review patch. If anyone has any objections, please let me know.

------------------

From: John Harrison John.C.Harrison@Intel.com

[ Upstream commit 5dce85fecb87751ec94526e1ac516dd7871e2e0c ]

Adding lockdep checking to the coredump code showed that there was an existing violation. The dev_coredumpm_timeout() call is used to register the dump with the base coredump subsystem. However, that makes multiple memory allocations, only some of which use the GFP_ flags passed in. So that also needs to be deferred to the worker function where it is safe to allocate with arbitrary flags.

In order to not add protoypes for the callback functions, moving the _timeout call also means moving the worker thread function to later in the file.

v2: Rebased after other changes to the worker function.

Fixes: e799485044cb ("drm/xe: Introduce the dev_coredump infrastructure.") Cc: Thomas Hellström thomas.hellstrom@linux.intel.com Cc: Matthew Brost matthew.brost@intel.com Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Francois Dugast francois.dugast@intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Cc: "Thomas Hellström" thomas.hellstrom@linux.intel.com Cc: Sumit Semwal sumit.semwal@linaro.org Cc: "Christian König" christian.koenig@amd.com Cc: intel-xe@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linaro-mm-sig@lists.linaro.org Cc: stable@vger.kernel.org # v6.8+ Signed-off-by: John Harrison John.C.Harrison@Intel.com Reviewed-by: Matthew Brost matthew.brost@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20241128210824.3302147-3-John.... (cherry picked from commit 90f51a7f4ec1004fc4ddfbc6d1f1068d85ef4771) Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/xe/xe_devcoredump.c | 73 +++++++++++++++-------------- 1 file changed, 39 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c index c40c91e27f71..c18e463092af 100644 --- a/drivers/gpu/drm/xe/xe_devcoredump.c +++ b/drivers/gpu/drm/xe/xe_devcoredump.c @@ -144,36 +144,6 @@ static void xe_devcoredump_snapshot_free(struct xe_devcoredump_snapshot *ss) ss->vm = NULL; }

-static void xe_devcoredump_deferred_snap_work(struct work_struct *work) -{ - struct xe_devcoredump_snapshot *ss = container_of(work, typeof(*ss), work); - struct xe_devcoredump *coredump = container_of(ss, typeof(*coredump), snapshot); - struct xe_device *xe = coredump_to_xe(coredump); - unsigned int fw_ref; - - xe_pm_runtime_get(xe); - - /* keep going if fw fails as we still want to save the memory and SW data */ - fw_ref = xe_force_wake_get(gt_to_fw(ss->gt), XE_FORCEWAKE_ALL); - if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL)) - xe_gt_info(ss->gt, "failed to get forcewake for coredump capture\n"); - xe_vm_snapshot_capture_delayed(ss->vm); - xe_guc_exec_queue_snapshot_capture_delayed(ss->ge); - xe_force_wake_put(gt_to_fw(ss->gt), fw_ref); - - xe_pm_runtime_put(xe); - - /* Calculate devcoredump size */ - ss->read.size = __xe_devcoredump_read(NULL, INT_MAX, coredump); - - ss->read.buffer = kvmalloc(ss->read.size, GFP_USER); - if (!ss->read.buffer) - return; - - __xe_devcoredump_read(ss->read.buffer, ss->read.size, coredump); - xe_devcoredump_snapshot_free(ss); -} - static ssize_t xe_devcoredump_read(char *buffer, loff_t offset, size_t count, void *data, size_t datalen) { @@ -222,6 +192,45 @@ static void xe_devcoredump_free(void *data) "Xe device coredump has been deleted.\n"); }

+static void xe_devcoredump_deferred_snap_work(struct work_struct *work) +{ + struct xe_devcoredump_snapshot *ss = container_of(work, typeof(*ss), work); + struct xe_devcoredump *coredump = container_of(ss, typeof(*coredump), snapshot); + struct xe_device *xe = coredump_to_xe(coredump); + unsigned int fw_ref; + + /* + * NB: Despite passing a GFP_ flags parameter here, more allocations are done + * internally using GFP_KERNEL expliictly. Hence this call must be in the worker + * thread and not in the initial capture call. + */ + dev_coredumpm_timeout(gt_to_xe(ss->gt)->drm.dev, THIS_MODULE, coredump, 0, GFP_KERNEL, + xe_devcoredump_read, xe_devcoredump_free, + XE_COREDUMP_TIMEOUT_JIFFIES); + + xe_pm_runtime_get(xe); + + /* keep going if fw fails as we still want to save the memory and SW data */ + fw_ref = xe_force_wake_get(gt_to_fw(ss->gt), XE_FORCEWAKE_ALL); + if (!xe_force_wake_ref_has_domain(fw_ref, XE_FORCEWAKE_ALL)) + xe_gt_info(ss->gt, "failed to get forcewake for coredump capture\n"); + xe_vm_snapshot_capture_delayed(ss->vm); + xe_guc_exec_queue_snapshot_capture_delayed(ss->ge); + xe_force_wake_put(gt_to_fw(ss->gt), fw_ref); + + xe_pm_runtime_put(xe); + + /* Calculate devcoredump size */ + ss->read.size = __xe_devcoredump_read(NULL, INT_MAX, coredump); + + ss->read.buffer = kvmalloc(ss->read.size, GFP_USER); + if (!ss->read.buffer) + return; + + __xe_devcoredump_read(ss->read.buffer, ss->read.size, coredump); + xe_devcoredump_snapshot_free(ss); +} + static void devcoredump_snapshot(struct xe_devcoredump *coredump, struct xe_sched_job *job) { @@ -305,10 +314,6 @@ void xe_devcoredump(struct xe_sched_job *job) drm_info(&xe->drm, "Xe device coredump has been created\n"); drm_info(&xe->drm, "Check your /sys/class/drm/card%d/device/devcoredump/data\n", xe->drm.primary->index); - - dev_coredumpm_timeout(xe->drm.dev, THIS_MODULE, coredump, 0, GFP_KERNEL, - xe_devcoredump_read, xe_devcoredump_free, - XE_COREDUMP_TIMEOUT_JIFFIES); }

static void xe_driver_devcoredump_fini(void *arg)