From: Arun Siluvery Date: Tue, 26 Aug 2014 13:44:51 +0000 (+0100) Subject: drm/i915/bdw: Export workaround data to debugfs X-Git-Tag: firefly_0821_release~176^2~3035^2~32^2~67 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=888b59951ed5ac450fe3ddd7b3937d905b9bafbc;p=firefly-linux-kernel-4.4.55.git drm/i915/bdw: Export workaround data to debugfs 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 Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 9d93af126f9c..1467cc1a47a9 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -2628,6 +2628,45 @@ static int i915_shared_dplls_info(struct seq_file *m, void *unused) 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; @@ -4159,6 +4198,7 @@ static const struct drm_info_list i915_debugfs_list[] = { {"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) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index f13f30d65172..95820652e153 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1556,6 +1556,20 @@ struct drm_i915_private { 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; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 1d5bfdb4fe97..14b517d61b4e 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -660,20 +660,40 @@ err: 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)); /* * update the number of dwords required based on the @@ -732,6 +752,9 @@ static int gen8_init_workarounds(struct intel_engine_cs *ring) intel_ring_advance(ring); + DRM_DEBUG_DRIVER("Number of Workarounds applied: %d\n", + dev_priv->num_wa_regs); + return 0; }