drm/i915: Capture batchbuffer state upon GPU hang

The bbstate contains useful bits of debugging information such as
whether the batch is being read from GTT or PPGTT, or whether it is
allowed to execute privileged instructions.

v2: Only record BB_STATE for gen4+

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 57715c8..8bc0b3b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -299,6 +299,7 @@ struct drm_i915_error_state {
        u32 cpu_ring_tail[I915_NUM_RINGS];
        u32 error; /* gen6+ */
        u32 err_int; /* gen7 */
+       u32 bbstate[I915_NUM_RINGS];
        u32 instpm[I915_NUM_RINGS];
        u32 instps[I915_NUM_RINGS];
        u32 extra_instdone[I915_NUM_INSTDONE_REG];

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 5dde810..a8bb213 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -249,7 +249,8 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
        err_printf(m, "  INSTDONE: 0x%08x\n", error->instdone[ring]);
        if (ring == RCS && INTEL_INFO(dev)->gen >= 4)
                err_printf(m, "  BBADDR: 0x%08llx\n", error->bbaddr);
-
+       if (INTEL_INFO(dev)->gen >= 4)
+               err_printf(m, "  BB_STATE: 0x%08x\n", error->bbstate[ring]);
        if (INTEL_INFO(dev)->gen >= 4)
                err_printf(m, "  INSTPS: 0x%08x\n", error->instps[ring]);
        err_printf(m, "  INSTPM: 0x%08x\n", error->instpm[ring]);
@@ -725,6 +726,7 @@ static void i915_record_ring_state(struct drm_device *dev,
                error->instps[ring->id] = I915_READ(RING_INSTPS(ring->mmio_base));
                if (ring->id == RCS)
                        error->bbaddr = I915_READ64(BB_ADDR);
+               error->bbstate[ring->id] = I915_READ(RING_BBSTATE(ring->mmio_base));
        } else {
                error->faddr[ring->id] = I915_READ(DMA_FADD_I8XX);
                error->ipeir[ring->id] = I915_READ(IPEIR);

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 47de41f..9785f7d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -718,6 +718,7 @@
 #define NOPID          0x02094
 #define HWSTAM         0x02098
 #define DMA_FADD_I8XX  0x020d0
+#define RING_BBSTATE(base)     ((base)+0x110)
 
 #define ERROR_GEN6     0x040a0
 #define GEN7_ERR_INT   0x44040