[Intel-gfx] [PATCH v2] drm/i915/dsb: Pre allocate and late cleanup of cmd buffer
Animesh Manna
animesh.manna at intel.com
Wed Feb 5 15:24:48 UTC 2020
Pre-allocate command buffer in atomic_commit using intel_dsb_prepare
function which also includes pinning and map in cpu domain.
No change is dsb write/commit functions.
Now dsb get/put function is refactored and currently used only for
reference counting. Below dsb api added to do respective job
mentioned below.
intel_dsb_prepare - Allocate, pin and map the buffer.
intel_dsb_cleanup - Unpin and release the gem object.
RFC: Initial patch for design review.
v2: included _init() part in _prepare(). [Daniel, Ville]
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
drivers/gpu/drm/i915/display/intel_atomic.c | 2 +
drivers/gpu/drm/i915/display/intel_display.c | 13 ++
drivers/gpu/drm/i915/display/intel_dsb.c | 132 ++++++++++++-------
drivers/gpu/drm/i915/display/intel_dsb.h | 2 +
4 files changed, 101 insertions(+), 48 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index 379c12f3b1d4..949272e60a04 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -290,7 +290,9 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
struct intel_crtc_state *crtc_state = to_intel_crtc_state(state);
+ struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ intel_dsb_cleanup(intel_crtc);
__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
intel_crtc_free_hw_state(crtc_state);
kfree(crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 368e481d45ee..4e3b422f0a29 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -15076,6 +15076,19 @@ static int intel_atomic_check(struct drm_device *dev,
static int intel_atomic_prepare_commit(struct intel_atomic_state *state)
{
+ struct intel_crtc_state *crtc_state;
+ struct intel_crtc *crtc;
+ int i;
+
+ for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
+ bool mode_changed = needs_modeset(crtc_state);
+
+ if (mode_changed || crtc_state->update_pipe ||
+ crtc_state->uapi.color_mgmt_changed) {
+ intel_dsb_prepare(crtc);
+ }
+ }
+
return drm_atomic_helper_prepare_planes(state->base.dev,
&state->base);
}
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 76ae01277fd6..fc9fc23b5fc1 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -34,6 +34,86 @@
#define DSB_BYTE_EN_SHIFT 20
#define DSB_REG_VALUE_MASK 0xfffff
+/**
+ * intel_dsb_prepare() - Allocate, pin and map the DSB command buffer.
+ * @crtc: intel_crtc structure to get pipe info.
+ *
+ * This function prepare the command buffer which is used to store dsb
+ * instructions with data.
+ */
+
+void intel_dsb_prepare(struct intel_crtc *crtc)
+{
+ struct drm_device *dev = crtc->base.dev;
+ struct drm_i915_private *i915 = to_i915(dev);
+ struct intel_dsb *dsb = &crtc->dsb;
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ u32 *buf;
+ intel_wakeref_t wakeref;
+
+ if (!HAS_DSB(i915) || dsb->cmd_buf)
+ return;
+
+ wakeref = intel_runtime_pm_get(&i915->runtime_pm);
+
+ obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
+ if (IS_ERR(obj)) {
+ DRM_ERROR("Gem object creation failed\n");
+ goto out;
+ }
+
+ vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
+ if (IS_ERR(vma)) {
+ DRM_ERROR("Vma creation failed\n");
+ i915_gem_object_put(obj);
+ goto out;
+ }
+
+ buf = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
+ if (IS_ERR(buf)) {
+ DRM_ERROR("Command buffer creation failed\n");
+ goto out;
+ }
+
+ dsb->id = DSB1;
+ dsb->vma = vma;
+ dsb->cmd_buf = buf;
+
+out:
+ /*
+ * On error dsb->cmd_buf will continue to be NULL, making the writes
+ * pass-through. Leave the dangling ref to be removed later by the
+ * corresponding intel_dsb_put(): the important error message will
+ * already be logged above.
+ */
+
+ intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+}
+
+/**
+ * intel_dsb_cleanup() - To cleanup DSB context.
+ * @dsb: intel_dsb structure.
+ *
+ * This function cleanup the DSB context by unpinning and releasing
+ * the VMA object associated with it.
+ */
+
+void intel_dsb_cleanup(struct intel_crtc *crtc)
+{
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ struct intel_dsb *dsb = &crtc->dsb;
+
+ if (!HAS_DSB(i915))
+ return;
+
+ if (!dsb->vma) {
+ i915_vma_unpin_and_release(&dsb->vma, I915_VMA_RELEASE_MAP);
+ dsb->vma = NULL;
+ dsb->cmd_buf = NULL;
+ }
+}
+
static inline bool is_dsb_busy(struct intel_dsb *dsb)
{
struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
@@ -84,14 +164,13 @@ static inline bool intel_dsb_disable_engine(struct intel_dsb *dsb)
}
/**
- * intel_dsb_get() - Allocate DSB context and return a DSB instance.
+ * intel_dsb_get() - Return a DSB instance and increase ref-count.
* @crtc: intel_crtc structure to get pipe info.
*
* This function provides handle of a DSB instance, for the further DSB
* operations.
*
* Returns: address of Intel_dsb instance requested for.
- * Failure: Returns the same DSB instance, but without a command buffer.
*/
struct intel_dsb *
@@ -100,52 +179,11 @@ intel_dsb_get(struct intel_crtc *crtc)
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *i915 = to_i915(dev);
struct intel_dsb *dsb = &crtc->dsb;
- struct drm_i915_gem_object *obj;
- struct i915_vma *vma;
- u32 *buf;
- intel_wakeref_t wakeref;
if (!HAS_DSB(i915))
return dsb;
- if (dsb->refcount++ != 0)
- return dsb;
-
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
-
- obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
- if (IS_ERR(obj)) {
- DRM_ERROR("Gem object creation failed\n");
- goto out;
- }
-
- vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
- if (IS_ERR(vma)) {
- DRM_ERROR("Vma creation failed\n");
- i915_gem_object_put(obj);
- goto out;
- }
-
- buf = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
- if (IS_ERR(buf)) {
- DRM_ERROR("Command buffer creation failed\n");
- goto out;
- }
-
- dsb->id = DSB1;
- dsb->vma = vma;
- dsb->cmd_buf = buf;
-
-out:
- /*
- * On error dsb->cmd_buf will continue to be NULL, making the writes
- * pass-through. Leave the dangling ref to be removed later by the
- * corresponding intel_dsb_put(): the important error message will
- * already be logged above.
- */
-
- intel_runtime_pm_put(&i915->runtime_pm, wakeref);
-
+ dsb->refcount++;
return dsb;
}
@@ -153,8 +191,8 @@ intel_dsb_get(struct intel_crtc *crtc)
* intel_dsb_put() - To destroy DSB context.
* @dsb: intel_dsb structure.
*
- * This function destroys the DSB context allocated by a dsb_get(), by
- * unpinning and releasing the VMA object associated with it.
+ * This function decrease the reference count and reset the command
+ * buffer position.
*/
void intel_dsb_put(struct intel_dsb *dsb)
@@ -169,8 +207,6 @@ void intel_dsb_put(struct intel_dsb *dsb)
return;
if (--dsb->refcount == 0) {
- i915_vma_unpin_and_release(&dsb->vma, I915_VMA_RELEASE_MAP);
- dsb->cmd_buf = NULL;
dsb->free_pos = 0;
dsb->ins_start_offset = 0;
}
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h b/drivers/gpu/drm/i915/display/intel_dsb.h
index 395ef9ce558e..1dcce198899a 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb.h
@@ -41,6 +41,8 @@ struct intel_dsb {
u32 ins_start_offset;
};
+void intel_dsb_prepare(struct intel_crtc *crtc);
+void intel_dsb_cleanup(struct intel_crtc *crtc);
struct intel_dsb *
intel_dsb_get(struct intel_crtc *crtc);
void intel_dsb_put(struct intel_dsb *dsb);
--
2.24.0
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