[PATCH 05/14] drm/xe: Convert GuC CT print to snapshot capture and print.
Rodrigo Vivi
rodrigo.vivi at intel.com
Wed Apr 26 20:57:04 UTC 2023
The goal is to allow for a snapshot capture to be taken at the time
of the crash, while the print out can happen at a later time through
the exposed devcoredump virtual device.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
drivers/gpu/drm/xe/xe_guc_ct.c | 132 +++++++++++++++++++++++----
drivers/gpu/drm/xe/xe_guc_ct.h | 7 +-
drivers/gpu/drm/xe/xe_guc_ct_types.h | 26 ++++++
3 files changed, 145 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index e16e5fe37ed4..0b7b95dbd9be 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -1095,31 +1095,26 @@ static void g2h_worker_func(struct work_struct *w)
xe_device_mem_access_put(ct_to_xe(ct));
}
-static void guc_ct_ctb_print(struct xe_device *xe, struct guc_ctb *ctb,
- struct drm_printer *p)
+static void guc_ctb_snapshot_capture(struct xe_device *xe, struct guc_ctb *ctb,
+ struct guc_ctb_snapshot *snapshot)
{
u32 head, tail;
- drm_printf(p, "\tsize: %d\n", ctb->info.size);
- drm_printf(p, "\tresv_space: %d\n", ctb->info.resv_space);
- drm_printf(p, "\thead: %d\n", ctb->info.head);
- drm_printf(p, "\ttail: %d\n", ctb->info.tail);
- drm_printf(p, "\tspace: %d\n", ctb->info.space);
- drm_printf(p, "\tbroken: %d\n", ctb->info.broken);
+ snapshot->cmds = kmalloc_array(ctb->info.size, sizeof(u32), GFP_ATOMIC);
- head = desc_read(xe, ctb, head);
- tail = desc_read(xe, ctb, tail);
- drm_printf(p, "\thead (memory): %d\n", head);
- drm_printf(p, "\ttail (memory): %d\n", tail);
- drm_printf(p, "\tstatus (memory): 0x%x\n", desc_read(xe, ctb, status));
+ xe_map_memcpy_from(xe, &snapshot->desc, &ctb->desc, 0,
+ sizeof(struct guc_ct_buffer_desc));
+ memcpy(&snapshot->info, &ctb->info, sizeof(struct guc_ctb_info));
+
+ head = snapshot->desc.head;
+ tail = snapshot->desc.tail;
if (head != tail) {
struct iosys_map map =
IOSYS_MAP_INIT_OFFSET(&ctb->cmds, head * sizeof(u32));
while (head != tail) {
- drm_printf(p, "\tcmd[%d]: 0x%08x\n", head,
- xe_map_rd(xe, &map, 0, u32));
+ snapshot->cmds[head] = xe_map_rd(xe, &map, 0, u32);
++head;
if (head == ctb->info.size) {
head = 0;
@@ -1131,20 +1126,119 @@ static void guc_ct_ctb_print(struct xe_device *xe, struct guc_ctb *ctb,
}
}
-void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p)
+static void guc_ctb_snapshot_print(struct guc_ctb_snapshot *snapshot,
+ struct drm_printer *p)
+{
+ u32 head, tail;
+
+ drm_printf(p, "\tsize: %d\n", snapshot->info.size);
+ drm_printf(p, "\tresv_space: %d\n", snapshot->info.space);
+ drm_printf(p, "\thead: %d\n", snapshot->info.head);
+ drm_printf(p, "\ttail: %d\n", snapshot->info.tail);
+ drm_printf(p, "\tspace: %d\n", snapshot->info.space);
+ drm_printf(p, "\tbroken: %d\n", snapshot->info.broken);
+ drm_printf(p, "\thead (memory): %d\n", snapshot->desc.head);
+ drm_printf(p, "\ttail (memory): %d\n", snapshot->desc.tail);
+ drm_printf(p, "\tstatus (memory): 0x%x\n", snapshot->desc.status);
+
+ head = snapshot->desc.head;
+ tail = snapshot->desc.tail;
+
+ while (head != tail) {
+ drm_printf(p, "\tcmd[%d]: 0x%08x\n", head,
+ snapshot->cmds[head]);
+ ++head;
+ if (head == snapshot->info.size)
+ head = 0;
+ }
+}
+
+static void guc_ctb_snapshot_free(struct guc_ctb_snapshot *snapshot)
+{
+ kfree(snapshot->cmds);
+}
+
+/**
+ * xe_guc_ct_snapshot_capture - Take a quick snapshot of the CT state.
+ * @ct: GuC CT object.
+ *
+ * This can be printed out in a later stage like during dev_coredump
+ * analysis.
+ *
+ * Returns: a GuC CT snapshot object that must be freed by the caller
+ * by using `xe_guc_ct_snapshot_free`.
+ */
+struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct)
{
+ struct xe_guc_ct_snapshot *snapshot;
+
+ snapshot = kzalloc(sizeof(struct xe_guc_ct_snapshot), GFP_ATOMIC);
+
if (ct->enabled) {
+ snapshot->ct_enabled = true;
+ guc_ctb_snapshot_capture(ct_to_xe(ct), &ct->ctbs.h2g,
+ &snapshot->h2g);
+ guc_ctb_snapshot_capture(ct_to_xe(ct), &ct->ctbs.g2h,
+ &snapshot->g2h);
+ }
+
+ return snapshot;
+}
+
+/**
+ * xe_guc_ct_snapshot_print - Print out a given GuC CT snapshot.
+ * @snapshot: GuC CT snapshot object.
+ * @p: drm_printer where it will be printed out.
+ *
+ * This function prints out a given GuC CT snapshot object.
+ */
+void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot,
+ struct drm_printer *p)
+{
+ if (snapshot->ct_enabled) {
drm_puts(p, "\nH2G CTB (all sizes in DW):\n");
- guc_ct_ctb_print(ct_to_xe(ct), &ct->ctbs.h2g, p);
+ guc_ctb_snapshot_print(&snapshot->h2g, p);
drm_puts(p, "\nG2H CTB (all sizes in DW):\n");
- guc_ct_ctb_print(ct_to_xe(ct), &ct->ctbs.g2h, p);
- drm_printf(p, "\tg2h outstanding: %d\n", ct->g2h_outstanding);
+ guc_ctb_snapshot_print(&snapshot->g2h, p);
+
+ drm_printf(p, "\tg2h outstanding: %d\n",
+ snapshot->g2h_outstanding);
} else {
drm_puts(p, "\nCT disabled\n");
}
}
+/**
+ * xe_guc_ct_snapshot_free - Free all allocated objects for a given snapshot.
+ * @snapshot: GuC CT snapshot object.
+ *
+ * This function free all the memory that needed to be allocated at capture
+ * time.
+ */
+void xe_guc_ct_snapshot_free(struct xe_guc_ct_snapshot *snapshot)
+{
+ guc_ctb_snapshot_free(&snapshot->h2g);
+ guc_ctb_snapshot_free(&snapshot->g2h);
+ kfree(snapshot);
+}
+
+/**
+ * xe_guc_ct_print - GuC CT Print.
+ * @ct: GuC CT.
+ * @p: drm_printer where it will be printed out.
+ *
+ * This function quickly capture a snapshot and immediately print it out.
+ */
+void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p)
+{
+ struct xe_guc_ct_snapshot *snapshot;
+
+ snapshot = xe_guc_ct_snapshot_capture(ct);
+ xe_guc_ct_snapshot_print(snapshot, p);
+ xe_guc_ct_snapshot_free(snapshot);
+}
+
#ifdef XE_GUC_CT_SELFTEST
/*
* Disable G2H processing in IRQ handler to force xe_guc_ct_send to enter flow
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h
index 49fb74f91e4d..29e0dff7ad9b 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.h
+++ b/drivers/gpu/drm/xe/xe_guc_ct.h
@@ -13,9 +13,14 @@ struct drm_printer;
int xe_guc_ct_init(struct xe_guc_ct *ct);
int xe_guc_ct_enable(struct xe_guc_ct *ct);
void xe_guc_ct_disable(struct xe_guc_ct *ct);
-void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p);
void xe_guc_ct_fast_path(struct xe_guc_ct *ct);
+struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct);
+void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot,
+ struct drm_printer *p);
+void xe_guc_ct_snapshot_free(struct xe_guc_ct_snapshot *snapshot);
+void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p);
+
static inline void xe_guc_ct_irq_handler(struct xe_guc_ct *ct)
{
wake_up_all(&ct->wq);
diff --git a/drivers/gpu/drm/xe/xe_guc_ct_types.h b/drivers/gpu/drm/xe/xe_guc_ct_types.h
index 64e3dd14d4b2..93046d95b009 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct_types.h
+++ b/drivers/gpu/drm/xe/xe_guc_ct_types.h
@@ -48,6 +48,32 @@ struct guc_ctb {
struct guc_ctb_info info;
};
+/**
+ * struct guc_ctb_snapshot - GuC command transport buffer (CTB) snapshot
+ */
+struct guc_ctb_snapshot {
+ /** @desc: snapshot of the CTB descriptor */
+ struct guc_ct_buffer_desc desc;
+ /** @cmds: snapshot of the CTB commands */
+ u32 *cmds;
+ /** @info: snapshot of the CTB info */
+ struct guc_ctb_info info;
+};
+
+/**
+ * struct xe_guc_ct_snapshot - GuC command transport (CT) snapshot
+ */
+struct xe_guc_ct_snapshot {
+ /** @ct_enabled: CT enabled info at capture time. */
+ bool ct_enabled;
+ /** @g2h_outstanding: G2H outstanding info at the capture time */
+ u32 g2h_outstanding;
+ /** @g2h: G2H CTB snapshot */
+ struct guc_ctb_snapshot g2h;
+ /** @h2g: H2G CTB snapshot */
+ struct guc_ctb_snapshot h2g;
+};
+
/**
* struct xe_guc_ct - GuC command transport (CT) layer
*
--
2.39.2
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