On Wed, Jul 31, 2024 at 04:31:01PM -0600, Cavitt, Jonathan wrote: > -----Original Message----- > From: Intel-xe <intel-xe-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Matthew Brost > Sent: Wednesday, July 31, 2024 2:32 PM > To: intel-xe@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx > Cc: maarten.lankhorst@xxxxxxxxxxxxxxx; Vivi, Rodrigo <rodrigo.vivi@xxxxxxxxx> > Subject: [PATCH v4 3/3] drm/xe: Faster devcoredump > > > > The current algorithm to read out devcoredump is O(N*N) where N is the > > size of coredump due to usage of the drm_coredump_printer in > > xe_devcoredump_read. Switch to a O(N) algorithm which prints the > > devcoredump into a readable format in snapshot work and update > > xe_devcoredump_read to memcpy from the readable format directly. > > > > v2: > > - Fix double free on devcoredump removal (Testing) > > - Set read_data_size after snap work flush > > - Adjust remaining in iterator upon realloc (Testing) > > - Set read_data upon realloc (Testing) > > v3: > > - Kernel doc > > > > Reported-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2408 > > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > > Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx> > > --- > > drivers/gpu/drm/xe/xe_devcoredump.c | 112 ++++++++++++++++------ > > drivers/gpu/drm/xe/xe_devcoredump_types.h | 4 + > > 2 files changed, 85 insertions(+), 31 deletions(-) > > > > diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c > > index d8d8ca2c19d3..b802a35c22f2 100644 > > --- a/drivers/gpu/drm/xe/xe_devcoredump.c > > +++ b/drivers/gpu/drm/xe/xe_devcoredump.c > > @@ -66,22 +66,9 @@ static struct xe_guc *exec_queue_to_guc(struct xe_exec_queue *q) > > return &q->gt->uc.guc; > > } > > > > -static void xe_devcoredump_deferred_snap_work(struct work_struct *work) > > -{ > > - struct xe_devcoredump_snapshot *ss = container_of(work, typeof(*ss), work); > > - > > - /* keep going if fw fails as we still want to save the memory and SW data */ > > - if (xe_force_wake_get(gt_to_fw(ss->gt), 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), XE_FORCEWAKE_ALL); > > -} > > - > > -static ssize_t xe_devcoredump_read(char *buffer, loff_t offset, > > - size_t count, void *data, size_t datalen) > > +static ssize_t __xe_devcoredump_read(char *buffer, size_t count, > > + struct xe_devcoredump *coredump) > > { > > - struct xe_devcoredump *coredump = data; > > struct xe_device *xe; > > struct xe_devcoredump_snapshot *ss; > > struct drm_printer p; > > @@ -89,18 +76,12 @@ static ssize_t xe_devcoredump_read(char *buffer, loff_t offset, > > struct timespec64 ts; > > int i; > > > > - if (!coredump) > > - return -ENODEV; > > - > > xe = coredump_to_xe(coredump); > > ss = &coredump->snapshot; > > > > - /* Ensure delayed work is captured before continuing */ > > - flush_work(&ss->work); > > - > > iter.data = buffer; > > iter.offset = 0; > > - iter.start = offset; > > + iter.start = 0; > > iter.remain = count; > > > > p = drm_coredump_printer(&iter); > > @@ -131,13 +112,86 @@ static ssize_t xe_devcoredump_read(char *buffer, loff_t offset, > > drm_printf(&p, "\n**** VM state ****\n"); > > xe_vm_snapshot_print(coredump->snapshot.vm, &p); > > > > - return count - iter.remain; > > + return iter.offset; > > +} > > + > > +static void xe_devcoredump_snapshot_free(struct xe_devcoredump_snapshot *ss) > > +{ > > + int i; > > + > > + xe_guc_ct_snapshot_free(ss->ct); > > + ss->ct = NULL; > > + > > + xe_guc_exec_queue_snapshot_free(ss->ge); > > + ss->ge = NULL; > > + > > + xe_sched_job_snapshot_free(ss->job); > > + ss->job = NULL; > > + > > + for (i = 0; i < XE_NUM_HW_ENGINES; i++) > > + if (ss->hwe[i]) { > > + xe_hw_engine_snapshot_free(ss->hwe[i]); > > + ss->hwe[i] = NULL; > > + } > > + > > + xe_vm_snapshot_free(ss->vm); > > + 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); > > + > > + /* keep going if fw fails as we still want to save the memory and SW data */ > > + if (xe_force_wake_get(gt_to_fw(ss->gt), 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), XE_FORCEWAKE_ALL); > > + > > + /* Calculate devcoredump size */ > > + ss->read_data_size = __xe_devcoredump_read(NULL, INT_MAX, coredump); > > + > > + ss->read_data = kvmalloc(ss->read_data_size, GFP_USER); > > + if (!ss->read_data) > > + return; > > + > > + __xe_devcoredump_read(ss->read_data, ss->read_data_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) > > +{ > > + struct xe_devcoredump *coredump = data; > > + struct xe_devcoredump_snapshot *ss; > > + ssize_t byte_copied; > > + > > + if (!coredump) > > + return -ENODEV; > > + > > + ss = &coredump->snapshot; > > + > > + /* Ensure delayed work is captured before continuing */ > > + flush_work(&ss->work); > > + > > + if (!ss->read_data) > > + return -ENODEV; > > + > > + if (offset >= ss->read_data_size) > > + return 0; > > + > > + byte_copied = count < ss->read_data_size - offset ? count : > > + ss->read_data_size - offset; > > + memcpy(buffer, ss->read_data + offset, byte_copied); > > + > > + return byte_copied; > > } > > > > static void xe_devcoredump_free(void *data) > > { > > struct xe_devcoredump *coredump = data; > > - int i; > > > > /* Our device is gone. Nothing to do... */ > > if (!data || !coredump_to_xe(coredump)) > > @@ -145,13 +199,8 @@ static void xe_devcoredump_free(void *data) > > > > cancel_work_sync(&coredump->snapshot.work); > > > > - xe_guc_ct_snapshot_free(coredump->snapshot.ct); > > - xe_guc_exec_queue_snapshot_free(coredump->snapshot.ge); > > - xe_sched_job_snapshot_free(coredump->snapshot.job); > > - for (i = 0; i < XE_NUM_HW_ENGINES; i++) > > - if (coredump->snapshot.hwe[i]) > > - xe_hw_engine_snapshot_free(coredump->snapshot.hwe[i]); > > - xe_vm_snapshot_free(coredump->snapshot.vm); > > + xe_devcoredump_snapshot_free(&coredump->snapshot); > > + kvfree(coredump->snapshot.read_data); > > > > /* To prevent stale data on next snapshot, clear everything */ > > memset(&coredump->snapshot, 0, sizeof(coredump->snapshot)); > > @@ -260,4 +309,5 @@ int xe_devcoredump_init(struct xe_device *xe) > > { > > return devm_add_action_or_reset(xe->drm.dev, xe_driver_devcoredump_fini, &xe->drm); > > } > > + > > #endif > > diff --git a/drivers/gpu/drm/xe/xe_devcoredump_types.h b/drivers/gpu/drm/xe/xe_devcoredump_types.h > > index 923cdf72a816..0298037edae4 100644 > > --- a/drivers/gpu/drm/xe/xe_devcoredump_types.h > > +++ b/drivers/gpu/drm/xe/xe_devcoredump_types.h > > @@ -46,6 +46,10 @@ struct xe_devcoredump_snapshot { > > struct xe_sched_job_snapshot *job; > > /** @vm: Snapshot of VM state */ > > struct xe_vm_snapshot *vm; > > + /** @read_data_size: size of read data */ > > + ssize_t read_data_size; > > + /** @read_data: Read data */ > > + void *read_data; > > Perhaps the data size and read data can be stapled together under the same > struct? > > struct { > ssize_t size; > void *data; > } read_data; > Yes, I like this better. Will change. Matt > It's not that big of a deal if this is untouched, just something to consider. > Reviewed-by: Jonathan Cavitt <jonathan.cavitt@xxxxxxxxx> > -Jonathan Cavitt > > > }; > > > > /** > > -- > > 2.34.1 > > > >
