drm/i915: Use snprintf to avoid line-break when pretty-printing engines

When printing the execlist ports, we first print the ELSP header then
follow it with the pretty-printed request. Since switching to
drm_printer and show the output via printk, it automatically appends a
newline to each call (unlike the old seq_printf output). To avoid the
unwanted line break, construct the ELSP request header in a temporary
buffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208012303.25504-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 86d4c85..dbd188a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1674,6 +1674,7 @@ void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
        struct drm_i915_private *dev_priv = engine->i915;
        struct drm_i915_gem_request *rq;
        struct rb_node *rb;
+       char hdr[80];
        u64 addr;
 
        drm_printf(m, "%s\n", engine->name);
@@ -1786,12 +1787,12 @@ void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
 
                        rq = port_unpack(&execlists->port[idx], &count);
                        if (rq) {
-                               drm_printf(m, "\t\tELSP[%d] count=%d, ",
-                                          idx, count);
-                               print_request(m, rq, "rq: ");
+                               snprintf(hdr, sizeof(hdr),
+                                        "\t\tELSP[%d] count=%d, rq: ",
+                                        idx, count);
+                               print_request(m, rq, hdr);
                        } else {
-                               drm_printf(m, "\t\tELSP[%d] idle\n",
-                                          idx);
+                               drm_printf(m, "\t\tELSP[%d] idle\n", idx);
                        }
                }
                drm_printf(m, "\t\tHW active? 0x%x\n", execlists->active);