On 7/11/2016 4:00 PM, Tvrtko Ursulin wrote:
On 10/07/16 14:41, akash.goel@xxxxxxxxx wrote:
From: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
There are certain types of interrupts which Host can recieve from GuC.
GuC ukernel sends an interrupt to Host for certain events, like for
example retrieve/consume the logs generated by ukernel.
This patch adds support to receive interrupts from GuC but currently
enables & partially handles only the interrupt sent by GuC ukernel.
Future patches will add support for handling other interrupt types.
v2:
- Use common low level routines for PM IER/IIR programming (Chris)
- Rename interrupt functions to gen9_xxx from gen8_xxx (Chris)
- Replace disabling of wake ref asserts with rpm get/put (Chris)
v3:
- Update comments for more clarity. (Tvrtko)
- Remove the masking of GuC interrupt, which was kept masked till the
start of bottom half, its not really needed as there is only a
single instance of work item & wq is ordered. (Tvrtko)
v4:
- Rebase.
- Rename guc_events to pm_guc_events so as to be indicative of the
register/control block it is associated with. (Chris)
- Add handling for back to back log buffer flush interrupts.
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Signed-off-by: Akash Goel <akash.goel@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_guc_submission.c | 5 ++
drivers/gpu/drm/i915/i915_irq.c | 98
++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/i915_reg.h | 11 ++++
drivers/gpu/drm/i915/intel_drv.h | 3 +
drivers/gpu/drm/i915/intel_guc.h | 4 ++
drivers/gpu/drm/i915/intel_guc_loader.c | 4 ++
7 files changed, 122 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h
b/drivers/gpu/drm/i915/i915_drv.h
index c3a579f..6e2ddfa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1794,6 +1794,7 @@ struct drm_i915_private {
u32 pm_imr;
u32 pm_ier;
u32 pm_rps_events;
+ u32 pm_guc_events;
u32 pipestat_irq_mask[I915_MAX_PIPES];
struct i915_hotplug hotplug;
+
/**
* bdw_update_port_irq - update DE port interrupt
* @dev_priv: driver private
@@ -1174,6 +1208,21 @@ static void gen6_pm_rps_work(struct work_struct
*work)
mutex_unlock(&dev_priv->rps.hw_lock);
}
+static void gen9_guc2host_events_work(struct work_struct *work)
+{
+ struct drm_i915_private *dev_priv =
+ container_of(work, struct drm_i915_private, guc.events_work);
+
+ spin_lock_irq(&dev_priv->irq_lock);
+ /* Speed up work cancellation during disabling guc interrupts. */
+ if (!dev_priv->guc.interrupts_enabled) {
+ spin_unlock_irq(&dev_priv->irq_lock);
+ return;
+ }
+ spin_unlock_irq(&dev_priv->irq_lock);
+
+ /* TODO: Handle the events for which GuC interrupted host */
+}
/**
* ivybridge_parity_work - Workqueue called when a parity error
interrupt
@@ -1346,11 +1395,13 @@ static irqreturn_t gen8_gt_irq_ack(struct
drm_i915_private *dev_priv,
DRM_ERROR("The master control interrupt lied (GT3)!\n");
}
- if (master_ctl & GEN8_GT_PM_IRQ) {
+ if (master_ctl & (GEN8_GT_PM_IRQ | GEN8_GT_GUC_IRQ)) {
gt_iir[2] = I915_READ_FW(GEN8_GT_IIR(2));
- if (gt_iir[2] & dev_priv->pm_rps_events) {
+ if (gt_iir[2] & (dev_priv->pm_rps_events |
+ dev_priv->pm_guc_events)) {
I915_WRITE_FW(GEN8_GT_IIR(2),
- gt_iir[2] & dev_priv->pm_rps_events);
+ gt_iir[2] & (dev_priv->pm_rps_events |
+ dev_priv->pm_guc_events));
ret = IRQ_HANDLED;
} else
DRM_ERROR("The master control interrupt lied (PM)!\n");
@@ -1382,6 +1433,9 @@ static void gen8_gt_irq_handler(struct
drm_i915_private *dev_priv,
if (gt_iir[2] & dev_priv->pm_rps_events)
gen6_rps_irq_handler(dev_priv, gt_iir[2]);
+
+ if (gt_iir[2] & dev_priv->pm_guc_events)
+ gen9_guc_irq_handler(dev_priv, gt_iir[2]);
}
static bool bxt_port_hotplug_long_detect(enum port port, u32 val)
@@ -1628,6 +1682,38 @@ static void gen6_rps_irq_handler(struct
drm_i915_private *dev_priv, u32 pm_iir)
}
}
+static void gen9_guc_irq_handler(struct drm_i915_private *dev_priv,
u32 gt_iir)
+{
+ if (gt_iir & GEN9_GUC_TO_HOST_INT_EVENT) {
+ spin_lock(&dev_priv->irq_lock);
+ if (dev_priv->guc.interrupts_enabled) {
+ /* Sample the log buffer flush related bits & clear them
+ * out now itself from the message identity register to
+ * minimize the probability of losing a flush interrupt,
+ * when there are back to back flush interrupts.
+ * There can be a new flush interrupt, for different log
+ * buffer type (like for ISR), whilst Host is handling
+ * one (for DPC). Since same bit is used in message
+ * register for ISR & DPC, it could happen that GuC
+ * sets the bit for 2nd interrupt but Host clears out
+ * the bit on handling the 1st interrupt.
+ */
+ u32 msg = I915_READ(SOFT_SCRATCH(15)) &
+ (GUC2HOST_MSG_CRASH_DUMP_POSTED |
+ GUC2HOST_MSG_FLUSH_LOG_BUFFER);
+ if (msg) {
+ /* Clear the message bits that are handled */
+ I915_WRITE(SOFT_SCRATCH(15),
+ I915_READ(SOFT_SCRATCH(15)) & ~msg);
+
+ /* Handle flush interrupt event in bottom half */
+ queue_work(dev_priv->wq, &dev_priv->guc.events_work);
Since the later patch is changing this to use a thread, since you have
established worker is too slow - especially the shared one - I would
really recommend you start with the kthread straight away. Not have the
worker for a while in the same series and then later change it to a thread.
Actually it won't be appropriate to say that shared worker thread is too
slow, but having a dedicated kthread definitely helps.
I kept the kthread patch at the last so that as per the response,
review comments can drop it also.
+ }
+ }
+ spin_unlock(&dev_priv->irq_lock);
Why does the above needs to be done under the irq_lock ?
Using the irq_lock for 'guc.interrupts_enabled', especially useful
while disabling the interrupt.
Best regards
Akash
+ }
+}
+
static bool intel_pipe_handle_vblank(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
@@ -3754,7 +3840,7 @@ static void gen8_gt_irq_postinstall(struct
drm_i915_private *dev_priv)
GEN8_IRQ_INIT_NDX(GT, 1, ~gt_interrupts[1], gt_interrupts[1]);
/*
* RPS interrupts will get enabled/disabled on demand when RPS
itself
- * is enabled/disabled.
+ * is enabled/disabled. Same wil be the case for GuC interrupts.
*/
GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_imr, dev_priv->pm_ier);
GEN8_IRQ_INIT_NDX(GT, 3, ~gt_interrupts[3], gt_interrupts[3]);
@@ -4539,6 +4625,10 @@ void intel_irq_init(struct drm_i915_private
*dev_priv)
INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
+ INIT_WORK(&dev_priv->guc.events_work, gen9_guc2host_events_work);
+
+ if (HAS_GUC_UCODE(dev))
+ dev_priv->pm_guc_events = GEN9_GUC_TO_HOST_INT_EVENT;
/* Let's track the enabled rps events */
if (IS_VALLEYVIEW(dev_priv))
diff --git a/drivers/gpu/drm/i915/i915_reg.h
b/drivers/gpu/drm/i915/i915_reg.h
index 8bfde75..d0d13a2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5963,6 +5963,7 @@ enum {
#define GEN8_DE_PIPE_A_IRQ (1<<16)
#define GEN8_DE_PIPE_IRQ(pipe) (1<<(16+(pipe)))
#define GEN8_GT_VECS_IRQ (1<<6)
+#define GEN8_GT_GUC_IRQ (1<<5)
#define GEN8_GT_PM_IRQ (1<<4)
#define GEN8_GT_VCS2_IRQ (1<<3)
#define GEN8_GT_VCS1_IRQ (1<<2)
@@ -5974,6 +5975,16 @@ enum {
#define GEN8_GT_IIR(which) _MMIO(0x44308 + (0x10 * (which)))
#define GEN8_GT_IER(which) _MMIO(0x4430c + (0x10 * (which)))
+#define GEN9_GUC_TO_HOST_INT_EVENT (1<<31)
+#define GEN9_GUC_EXEC_ERROR_EVENT (1<<30)
+#define GEN9_GUC_DISPLAY_EVENT (1<<29)
+#define GEN9_GUC_SEMA_SIGNAL_EVENT (1<<28)
+#define GEN9_GUC_IOMMU_MSG_EVENT (1<<27)
+#define GEN9_GUC_DB_RING_EVENT (1<<26)
+#define GEN9_GUC_DMA_DONE_EVENT (1<<25)
+#define GEN9_GUC_FATAL_ERROR_EVENT (1<<24)
+#define GEN9_GUC_NOTIFICATION_EVENT (1<<23)
+
#define GEN8_RCS_IRQ_SHIFT 0
#define GEN8_BCS_IRQ_SHIFT 16
#define GEN8_VCS1_IRQ_SHIFT 0
diff --git a/drivers/gpu/drm/i915/intel_drv.h
b/drivers/gpu/drm/i915/intel_drv.h
index ae6c535..6868f31 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1102,6 +1102,9 @@ void gen8_irq_power_well_post_enable(struct
drm_i915_private *dev_priv,
unsigned int pipe_mask);
void gen8_irq_power_well_pre_disable(struct drm_i915_private *dev_priv,
unsigned int pipe_mask);
+void gen9_reset_guc_interrupts(struct drm_i915_private *dev_priv);
+void gen9_enable_guc_interrupts(struct drm_i915_private *dev_priv);
+void gen9_disable_guc_interrupts(struct drm_i915_private *dev_priv);
/* intel_crt.c */
void intel_crt_init(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_guc.h
b/drivers/gpu/drm/i915/intel_guc.h
index d52eca3..2663b41 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -131,6 +131,10 @@ struct intel_guc {
struct intel_guc_fw guc_fw;
struct intel_guc_log log;
+ /* GuC2Host interrupt related state */
+ struct work_struct events_work;
+ bool interrupts_enabled;
+
struct drm_i915_gem_object *ads_obj;
struct drm_i915_gem_object *ctx_pool_obj;
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c
b/drivers/gpu/drm/i915/intel_guc_loader.c
index 4882f17..d74d7a5 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -450,6 +450,7 @@ int intel_guc_setup(struct drm_device *dev)
}
direct_interrupts_to_host(dev_priv);
+ gen9_reset_guc_interrupts(dev_priv);
guc_fw->guc_fw_load_status = GUC_FIRMWARE_PENDING;
@@ -496,6 +497,9 @@ int intel_guc_setup(struct drm_device *dev)
intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
if (i915.enable_guc_submission) {
+ if (i915.guc_log_level >= 0)
+ gen9_enable_guc_interrupts(dev_priv);
+
err = i915_guc_submission_enable(dev_priv);
if (err)
goto fail;
Regards,
Tvrtko
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