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-rw-r--r--target/linux/brcm2708/patches-4.4/0294-drm-vc4-improve-throughput-by-pipelining-binning-and.patch429
1 files changed, 429 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0294-drm-vc4-improve-throughput-by-pipelining-binning-and.patch b/target/linux/brcm2708/patches-4.4/0294-drm-vc4-improve-throughput-by-pipelining-binning-and.patch
new file mode 100644
index 0000000..89c067b
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0294-drm-vc4-improve-throughput-by-pipelining-binning-and.patch
@@ -0,0 +1,429 @@
+From a2c21b04f340f594c16f9c7235ec7b7f78a96a1f Mon Sep 17 00:00:00 2001
+From: Varad Gautam <varadgautam@gmail.com>
+Date: Wed, 17 Feb 2016 19:08:21 +0530
+Subject: [PATCH 294/304] drm/vc4: improve throughput by pipelining binning and
+ rendering jobs
+
+The hardware provides us with separate threads for binning and
+rendering, and the existing model waits for them both to complete
+before submitting the next job.
+
+Splitting the binning and rendering submissions reduces idle time and
+gives us approx 20-30% speedup with some x11perf tests such as -line10
+and -tilerect1. Improves openarena performance by 1.01897% +/-
+0.247857% (n=16).
+
+Thanks to anholt for suggesting this.
+
+v2: Rebase on the spurious resets fix (change by anholt).
+
+Signed-off-by: Varad Gautam <varadgautam@gmail.com>
+Reviewed-by: Eric Anholt <eric@anholt.net>
+Signed-off-by: Eric Anholt <eric@anholt.net>
+(cherry picked from commit ca26d28bbaa39f31d5e7e4812603b015c8d54207)
+---
+ drivers/gpu/drm/vc4/vc4_drv.h | 37 +++++++++----
+ drivers/gpu/drm/vc4/vc4_gem.c | 123 ++++++++++++++++++++++++++++++------------
+ drivers/gpu/drm/vc4/vc4_irq.c | 58 ++++++++++++++++----
+ 3 files changed, 166 insertions(+), 52 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_drv.h
++++ b/drivers/gpu/drm/vc4/vc4_drv.h
+@@ -53,7 +53,7 @@ struct vc4_dev {
+ /* Protects bo_cache and the BO stats. */
+ struct mutex bo_lock;
+
+- /* Sequence number for the last job queued in job_list.
++ /* Sequence number for the last job queued in bin_job_list.
+ * Starts at 0 (no jobs emitted).
+ */
+ uint64_t emit_seqno;
+@@ -63,11 +63,19 @@ struct vc4_dev {
+ */
+ uint64_t finished_seqno;
+
+- /* List of all struct vc4_exec_info for jobs to be executed.
+- * The first job in the list is the one currently programmed
+- * into ct0ca/ct1ca for execution.
++ /* List of all struct vc4_exec_info for jobs to be executed in
++ * the binner. The first job in the list is the one currently
++ * programmed into ct0ca for execution.
++ */
++ struct list_head bin_job_list;
++
++ /* List of all struct vc4_exec_info for jobs that have
++ * completed binning and are ready for rendering. The first
++ * job in the list is the one currently programmed into ct1ca
++ * for execution.
+ */
+- struct list_head job_list;
++ struct list_head render_job_list;
++
+ /* List of the finished vc4_exec_infos waiting to be freed by
+ * job_done_work.
+ */
+@@ -291,11 +299,20 @@ struct vc4_exec_info {
+ };
+
+ static inline struct vc4_exec_info *
+-vc4_first_job(struct vc4_dev *vc4)
++vc4_first_bin_job(struct vc4_dev *vc4)
++{
++ if (list_empty(&vc4->bin_job_list))
++ return NULL;
++ return list_first_entry(&vc4->bin_job_list, struct vc4_exec_info, head);
++}
++
++static inline struct vc4_exec_info *
++vc4_first_render_job(struct vc4_dev *vc4)
+ {
+- if (list_empty(&vc4->job_list))
++ if (list_empty(&vc4->render_job_list))
+ return NULL;
+- return list_first_entry(&vc4->job_list, struct vc4_exec_info, head);
++ return list_first_entry(&vc4->render_job_list,
++ struct vc4_exec_info, head);
+ }
+
+ /**
+@@ -410,7 +427,9 @@ int vc4_wait_seqno_ioctl(struct drm_devi
+ struct drm_file *file_priv);
+ int vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv);
+-void vc4_submit_next_job(struct drm_device *dev);
++void vc4_submit_next_bin_job(struct drm_device *dev);
++void vc4_submit_next_render_job(struct drm_device *dev);
++void vc4_move_job_to_render(struct drm_device *dev, struct vc4_exec_info *exec);
+ int vc4_wait_for_seqno(struct drm_device *dev, uint64_t seqno,
+ uint64_t timeout_ns, bool interruptible);
+ void vc4_job_handle_completed(struct vc4_dev *vc4);
+--- a/drivers/gpu/drm/vc4/vc4_gem.c
++++ b/drivers/gpu/drm/vc4/vc4_gem.c
+@@ -154,10 +154,10 @@ vc4_save_hang_state(struct drm_device *d
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+ struct drm_vc4_get_hang_state *state;
+ struct vc4_hang_state *kernel_state;
+- struct vc4_exec_info *exec;
++ struct vc4_exec_info *exec[2];
+ struct vc4_bo *bo;
+ unsigned long irqflags;
+- unsigned int i, unref_list_count;
++ unsigned int i, j, unref_list_count, prev_idx;
+
+ kernel_state = kcalloc(1, sizeof(*kernel_state), GFP_KERNEL);
+ if (!kernel_state)
+@@ -166,37 +166,55 @@ vc4_save_hang_state(struct drm_device *d
+ state = &kernel_state->user_state;
+
+ spin_lock_irqsave(&vc4->job_lock, irqflags);
+- exec = vc4_first_job(vc4);
+- if (!exec) {
++ exec[0] = vc4_first_bin_job(vc4);
++ exec[1] = vc4_first_render_job(vc4);
++ if (!exec[0] && !exec[1]) {
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+ return;
+ }
+
+- unref_list_count = 0;
+- list_for_each_entry(bo, &exec->unref_list, unref_head)
+- unref_list_count++;
+-
+- state->bo_count = exec->bo_count + unref_list_count;
+- kernel_state->bo = kcalloc(state->bo_count, sizeof(*kernel_state->bo),
+- GFP_ATOMIC);
++ /* Get the bos from both binner and renderer into hang state. */
++ state->bo_count = 0;
++ for (i = 0; i < 2; i++) {
++ if (!exec[i])
++ continue;
++
++ unref_list_count = 0;
++ list_for_each_entry(bo, &exec[i]->unref_list, unref_head)
++ unref_list_count++;
++ state->bo_count += exec[i]->bo_count + unref_list_count;
++ }
++
++ kernel_state->bo = kcalloc(state->bo_count,
++ sizeof(*kernel_state->bo), GFP_ATOMIC);
++
+ if (!kernel_state->bo) {
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+ return;
+ }
+
+- for (i = 0; i < exec->bo_count; i++) {
+- drm_gem_object_reference(&exec->bo[i]->base);
+- kernel_state->bo[i] = &exec->bo[i]->base;
+- }
++ prev_idx = 0;
++ for (i = 0; i < 2; i++) {
++ if (!exec[i])
++ continue;
++
++ for (j = 0; j < exec[i]->bo_count; j++) {
++ drm_gem_object_reference(&exec[i]->bo[j]->base);
++ kernel_state->bo[j + prev_idx] = &exec[i]->bo[j]->base;
++ }
+
+- list_for_each_entry(bo, &exec->unref_list, unref_head) {
+- drm_gem_object_reference(&bo->base.base);
+- kernel_state->bo[i] = &bo->base.base;
+- i++;
++ list_for_each_entry(bo, &exec[i]->unref_list, unref_head) {
++ drm_gem_object_reference(&bo->base.base);
++ kernel_state->bo[j + prev_idx] = &bo->base.base;
++ j++;
++ }
++ prev_idx = j + 1;
+ }
+
+- state->start_bin = exec->ct0ca;
+- state->start_render = exec->ct1ca;
++ if (exec[0])
++ state->start_bin = exec[0]->ct0ca;
++ if (exec[1])
++ state->start_render = exec[1]->ct1ca;
+
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+
+@@ -272,13 +290,15 @@ vc4_hangcheck_elapsed(unsigned long data
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+ uint32_t ct0ca, ct1ca;
+ unsigned long irqflags;
+- struct vc4_exec_info *exec;
++ struct vc4_exec_info *bin_exec, *render_exec;
+
+ spin_lock_irqsave(&vc4->job_lock, irqflags);
+- exec = vc4_first_job(vc4);
++
++ bin_exec = vc4_first_bin_job(vc4);
++ render_exec = vc4_first_render_job(vc4);
+
+ /* If idle, we can stop watching for hangs. */
+- if (!exec) {
++ if (!bin_exec && !render_exec) {
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+ return;
+ }
+@@ -289,9 +309,12 @@ vc4_hangcheck_elapsed(unsigned long data
+ /* If we've made any progress in execution, rearm the timer
+ * and wait.
+ */
+- if (ct0ca != exec->last_ct0ca || ct1ca != exec->last_ct1ca) {
+- exec->last_ct0ca = ct0ca;
+- exec->last_ct1ca = ct1ca;
++ if ((bin_exec && ct0ca != bin_exec->last_ct0ca) ||
++ (render_exec && ct1ca != render_exec->last_ct1ca)) {
++ if (bin_exec)
++ bin_exec->last_ct0ca = ct0ca;
++ if (render_exec)
++ render_exec->last_ct1ca = ct1ca;
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+ vc4_queue_hangcheck(dev);
+ return;
+@@ -391,11 +414,13 @@ vc4_flush_caches(struct drm_device *dev)
+ * The job_lock should be held during this.
+ */
+ void
+-vc4_submit_next_job(struct drm_device *dev)
++vc4_submit_next_bin_job(struct drm_device *dev)
+ {
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+- struct vc4_exec_info *exec = vc4_first_job(vc4);
++ struct vc4_exec_info *exec;
+
++again:
++ exec = vc4_first_bin_job(vc4);
+ if (!exec)
+ return;
+
+@@ -405,11 +430,40 @@ vc4_submit_next_job(struct drm_device *d
+ V3D_WRITE(V3D_BPOA, 0);
+ V3D_WRITE(V3D_BPOS, 0);
+
+- if (exec->ct0ca != exec->ct0ea)
++ /* Either put the job in the binner if it uses the binner, or
++ * immediately move it to the to-be-rendered queue.
++ */
++ if (exec->ct0ca != exec->ct0ea) {
+ submit_cl(dev, 0, exec->ct0ca, exec->ct0ea);
++ } else {
++ vc4_move_job_to_render(dev, exec);
++ goto again;
++ }
++}
++
++void
++vc4_submit_next_render_job(struct drm_device *dev)
++{
++ struct vc4_dev *vc4 = to_vc4_dev(dev);
++ struct vc4_exec_info *exec = vc4_first_render_job(vc4);
++
++ if (!exec)
++ return;
++
+ submit_cl(dev, 1, exec->ct1ca, exec->ct1ea);
+ }
+
++void
++vc4_move_job_to_render(struct drm_device *dev, struct vc4_exec_info *exec)
++{
++ struct vc4_dev *vc4 = to_vc4_dev(dev);
++ bool was_empty = list_empty(&vc4->render_job_list);
++
++ list_move_tail(&exec->head, &vc4->render_job_list);
++ if (was_empty)
++ vc4_submit_next_render_job(dev);
++}
++
+ static void
+ vc4_update_bo_seqnos(struct vc4_exec_info *exec, uint64_t seqno)
+ {
+@@ -448,14 +502,14 @@ vc4_queue_submit(struct drm_device *dev,
+ exec->seqno = seqno;
+ vc4_update_bo_seqnos(exec, seqno);
+
+- list_add_tail(&exec->head, &vc4->job_list);
++ list_add_tail(&exec->head, &vc4->bin_job_list);
+
+ /* If no job was executing, kick ours off. Otherwise, it'll
+- * get started when the previous job's frame done interrupt
++ * get started when the previous job's flush done interrupt
+ * occurs.
+ */
+- if (vc4_first_job(vc4) == exec) {
+- vc4_submit_next_job(dev);
++ if (vc4_first_bin_job(vc4) == exec) {
++ vc4_submit_next_bin_job(dev);
+ vc4_queue_hangcheck(dev);
+ }
+
+@@ -849,7 +903,8 @@ vc4_gem_init(struct drm_device *dev)
+ {
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+- INIT_LIST_HEAD(&vc4->job_list);
++ INIT_LIST_HEAD(&vc4->bin_job_list);
++ INIT_LIST_HEAD(&vc4->render_job_list);
+ INIT_LIST_HEAD(&vc4->job_done_list);
+ INIT_LIST_HEAD(&vc4->seqno_cb_list);
+ spin_lock_init(&vc4->job_lock);
+--- a/drivers/gpu/drm/vc4/vc4_irq.c
++++ b/drivers/gpu/drm/vc4/vc4_irq.c
+@@ -30,6 +30,10 @@
+ * disables that specific interrupt, and 0s written are ignored
+ * (reading either one returns the set of enabled interrupts).
+ *
++ * When we take a binning flush done interrupt, we need to submit the
++ * next frame for binning and move the finished frame to the render
++ * thread.
++ *
+ * When we take a render frame interrupt, we need to wake the
+ * processes waiting for some frame to be done, and get the next frame
+ * submitted ASAP (so the hardware doesn't sit idle when there's work
+@@ -44,6 +48,7 @@
+ #include "vc4_regs.h"
+
+ #define V3D_DRIVER_IRQS (V3D_INT_OUTOMEM | \
++ V3D_INT_FLDONE | \
+ V3D_INT_FRDONE)
+
+ DECLARE_WAIT_QUEUE_HEAD(render_wait);
+@@ -77,7 +82,7 @@ vc4_overflow_mem_work(struct work_struct
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&vc4->job_lock, irqflags);
+- current_exec = vc4_first_job(vc4);
++ current_exec = vc4_first_bin_job(vc4);
+ if (current_exec) {
+ vc4->overflow_mem->seqno = vc4->finished_seqno + 1;
+ list_add_tail(&vc4->overflow_mem->unref_head,
+@@ -98,17 +103,43 @@ vc4_overflow_mem_work(struct work_struct
+ }
+
+ static void
+-vc4_irq_finish_job(struct drm_device *dev)
++vc4_irq_finish_bin_job(struct drm_device *dev)
++{
++ struct vc4_dev *vc4 = to_vc4_dev(dev);
++ struct vc4_exec_info *exec = vc4_first_bin_job(vc4);
++
++ if (!exec)
++ return;
++
++ vc4_move_job_to_render(dev, exec);
++ vc4_submit_next_bin_job(dev);
++}
++
++static void
++vc4_cancel_bin_job(struct drm_device *dev)
++{
++ struct vc4_dev *vc4 = to_vc4_dev(dev);
++ struct vc4_exec_info *exec = vc4_first_bin_job(vc4);
++
++ if (!exec)
++ return;
++
++ list_move_tail(&exec->head, &vc4->bin_job_list);
++ vc4_submit_next_bin_job(dev);
++}
++
++static void
++vc4_irq_finish_render_job(struct drm_device *dev)
+ {
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+- struct vc4_exec_info *exec = vc4_first_job(vc4);
++ struct vc4_exec_info *exec = vc4_first_render_job(vc4);
+
+ if (!exec)
+ return;
+
+ vc4->finished_seqno++;
+ list_move_tail(&exec->head, &vc4->job_done_list);
+- vc4_submit_next_job(dev);
++ vc4_submit_next_render_job(dev);
+
+ wake_up_all(&vc4->job_wait_queue);
+ schedule_work(&vc4->job_done_work);
+@@ -125,9 +156,10 @@ vc4_irq(int irq, void *arg)
+ barrier();
+ intctl = V3D_READ(V3D_INTCTL);
+
+- /* Acknowledge the interrupts we're handling here. The render
+- * frame done interrupt will be cleared, while OUTOMEM will
+- * stay high until the underlying cause is cleared.
++ /* Acknowledge the interrupts we're handling here. The binner
++ * last flush / render frame done interrupt will be cleared,
++ * while OUTOMEM will stay high until the underlying cause is
++ * cleared.
+ */
+ V3D_WRITE(V3D_INTCTL, intctl);
+
+@@ -138,9 +170,16 @@ vc4_irq(int irq, void *arg)
+ status = IRQ_HANDLED;
+ }
+
++ if (intctl & V3D_INT_FLDONE) {
++ spin_lock(&vc4->job_lock);
++ vc4_irq_finish_bin_job(dev);
++ spin_unlock(&vc4->job_lock);
++ status = IRQ_HANDLED;
++ }
++
+ if (intctl & V3D_INT_FRDONE) {
+ spin_lock(&vc4->job_lock);
+- vc4_irq_finish_job(dev);
++ vc4_irq_finish_render_job(dev);
+ spin_unlock(&vc4->job_lock);
+ status = IRQ_HANDLED;
+ }
+@@ -205,6 +244,7 @@ void vc4_irq_reset(struct drm_device *de
+ V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
+
+ spin_lock_irqsave(&vc4->job_lock, irqflags);
+- vc4_irq_finish_job(dev);
++ vc4_cancel_bin_job(dev);
++ vc4_irq_finish_render_job(dev);
+ spin_unlock_irqrestore(&vc4->job_lock, irqflags);
+ }
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