The workarounds that are applied are exported to a debugfs file;
this is used to verify their state after the test case (reset or
suspend/resume etc). This patch is only required to support i-g-t.
Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 40 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 14 ++++++++++++
drivers/gpu/drm/i915/intel_ringbuffer.c | 23 +++++++++++++++++++
3 files changed, 77 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d42db6b..f0d63f6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2451,20 +2451,59 @@ static int i915_shared_dplls_info(struct seq_file *m, void *unused)
seq_printf(m, " dpll_md: 0x%08x\n", pll->hw_state.dpll_md);
seq_printf(m, " fp0: 0x%08x\n", pll->hw_state.fp0);
seq_printf(m, " fp1: 0x%08x\n", pll->hw_state.fp1);
seq_printf(m, " wrpll: 0x%08x\n", pll->hw_state.wrpll);
}
drm_modeset_unlock_all(dev);
return 0;
}
+static int intel_wa_registers(struct seq_file *m, void *unused)
+{
+ int i;
+ int ret;
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (!IS_BROADWELL(dev)) {
+ DRM_DEBUG_DRIVER("Workaround table not available !!\n");
+ return -EINVAL;
+ }
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ intel_runtime_pm_get(dev_priv);
+
+ seq_printf(m, "Workarounds applied: %d\n", dev_priv->num_wa_regs);
+ for (i = 0; i < dev_priv->num_wa_regs; ++i) {
+ u32 addr, mask;
+
+ addr = dev_priv->intel_wa_regs[i].addr;
+ mask = dev_priv->intel_wa_regs[i].mask;
+ dev_priv->intel_wa_regs[i].value = I915_READ(addr) | mask;
+ if (dev_priv->intel_wa_regs[i].addr)
+ seq_printf(m, "0x%X: 0x%08X, mask: 0x%08X\n",
+ dev_priv->intel_wa_regs[i].addr,
+ dev_priv->intel_wa_regs[i].value,
+ dev_priv->intel_wa_regs[i].mask);
+ }
+
+ intel_runtime_pm_put(dev_priv);
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
struct pipe_crc_info {
const char *name;
struct drm_device *dev;
enum pipe pipe;
};
static int i915_dp_mst_info(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
@@ -3980,20 +4019,21 @@ static const struct drm_info_list i915_debugfs_list[] = {
{"i915_llc", i915_llc, 0},
{"i915_edp_psr_status", i915_edp_psr_status, 0},
{"i915_sink_crc_eDP1", i915_sink_crc, 0},
{"i915_energy_uJ", i915_energy_uJ, 0},
{"i915_pc8_status", i915_pc8_status, 0},
{"i915_power_domain_info", i915_power_domain_info, 0},
{"i915_display_info", i915_display_info, 0},
{"i915_semaphore_status", i915_semaphore_status, 0},
{"i915_shared_dplls_info", i915_shared_dplls_info, 0},
{"i915_dp_mst_info", i915_dp_mst_info, 0},
+ {"intel_wa_registers", intel_wa_registers, 0}
};
#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)
static const struct i915_debugfs_files {
const char *name;
const struct file_operations *fops;
} i915_debugfs_files[] = {
{"i915_wedged", &i915_wedged_fops},
{"i915_max_freq", &i915_max_freq_fops},
{"i915_min_freq", &i915_min_freq_fops},
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bcf79f0..49b7be7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1546,20 +1546,34 @@ struct drm_i915_private {
wait_queue_head_t pending_flip_queue;
#ifdef CONFIG_DEBUG_FS
struct intel_pipe_crc pipe_crc[I915_MAX_PIPES];
#endif
int num_shared_dpll;
struct intel_shared_dpll shared_dplls[I915_NUM_PLLS];
int dpio_phy_iosf_port[I915_NUM_PHYS_VLV];
+ /*
+ * workarounds are currently applied at different places and
+ * changes are being done to consolidate them so exact count is
+ * not clear at this point, use a max value for now.
+ */
+#define I915_MAX_WA_REGS 16
+ struct {
+ u32 addr;
+ u32 value;
+ /* bitmask representing WA bits */
+ u32 mask;
+ } intel_wa_regs[I915_MAX_WA_REGS];
+ u32 num_wa_regs;
+
/* Reclocking support */
bool render_reclock_avail;
bool lvds_downclock_avail;
/* indicates the reduced downclock for LVDS*/
int lvds_downclock;
struct i915_frontbuffer_tracking fb_tracking;
u16 orig_clock;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 4146582..e48e12a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -646,34 +646,54 @@ err_unpin:
i915_gem_object_ggtt_unpin(ring->scratch.obj);
err_unref:
drm_gem_object_unreference(&ring->scratch.obj->base);
err:
return ret;
}
static inline void intel_ring_emit_wa(struct intel_engine_cs *ring,
u32 addr, u32 value)
{
+ struct drm_device *dev = ring->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (dev_priv->num_wa_regs > I915_MAX_WA_REGS)
+ return;
+
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit(ring, addr);
intel_ring_emit(ring, value);
+
+ dev_priv->intel_wa_regs[dev_priv->num_wa_regs].addr = addr;
+ dev_priv->intel_wa_regs[dev_priv->num_wa_regs].mask = (value) & 0xFFFF;
+ /* value is updated with the status of remaining bits of this
+ * register when it is read from debugfs file
+ */
+ dev_priv->intel_wa_regs[dev_priv->num_wa_regs].value = value;
+ dev_priv->num_wa_regs++;
+
+ return;
}
static int gen8_init_workarounds(struct intel_engine_cs *ring)
{
int ret;
+ struct drm_device *dev = ring->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
/*
* workarounds applied in this fn are part of register state context,
* they need to be re-initialized followed by gpu reset, suspend/resume,
* module reload.
*/
+ dev_priv->num_wa_regs = 0;
+ memset(dev_priv->intel_wa_regs, 0, sizeof(dev_priv->intel_wa_regs));
