On 11/05/2016 09:55 PM, Rob Clark wrote:
Add basic state duplication/apply mechanism. Following commits will
move actual global hw state into this.
The state_lock allows multiple concurrent updates to proceed as long as
they don't both try to alter global state. The ww_mutex mechanism will
trigger backoff in case of deadlock between multiple threads trying to
update state.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
---
drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 43 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h | 22 +++++++++++++++++
2 files changed, 65 insertions(+)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index d3d45ed..ca6dfeb 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -72,6 +72,39 @@ static int mdp5_hw_init(struct msm_kms *kms)
return 0;
}
+struct mdp5_state *mdp5_get_state(struct drm_atomic_state *s)
+{
+ struct msm_drm_private *priv = s->dev->dev_private;
+ struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
+ struct msm_kms_state *state = to_kms_state(s);
+ struct mdp5_state *new_state;
+ int ret;
+
+ if (state->state)
+ return state->state;
+
+ ret = drm_modeset_lock(&mdp5_kms->state_lock, s->acquire_ctx);
+ if (ret)
+ return ERR_PTR(ret);
+
+ new_state = kmalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
+ if (!new_state)
+ return ERR_PTR(-ENOMEM);
+
+ /* Copy state: */
+ /* TODO */
+
+ state->state = new_state;
+
+ return new_state;
+}
+
+static void mdp5_swap_state(struct msm_kms *kms, struct drm_atomic_state *state)
+{
+ struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+ swap(to_kms_state(state)->state, mdp5_kms->state);
+}
+
static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
{
struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
@@ -140,6 +173,7 @@ static const struct mdp_kms_funcs kms_funcs = {
.irq = mdp5_irq,
.enable_vblank = mdp5_enable_vblank,
.disable_vblank = mdp5_disable_vblank,
+ .swap_state = mdp5_swap_state,
.prepare_commit = mdp5_prepare_commit,
.complete_commit = mdp5_complete_commit,
.wait_for_crtc_commit_done = mdp5_wait_for_crtc_commit_done,
@@ -645,6 +679,8 @@ static void mdp5_destroy(struct platform_device *pdev)
if (mdp5_kms->rpm_enabled)
pm_runtime_disable(&pdev->dev);
+
+ kfree(mdp5_kms->state);
}
static int construct_pipes(struct mdp5_kms *mdp5_kms, int cnt,
@@ -729,6 +765,13 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
mdp5_kms->dev = dev;
mdp5_kms->pdev = pdev;
+ drm_modeset_lock_init(&mdp5_kms->state_lock);
+ mdp5_kms->state = kzalloc(sizeof(*mdp5_kms->state), GFP_KERNEL);
+ if (!mdp5_kms->state) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
This would probably be better in mdp5_kms_init() since it's intializing kms stuff, and
not hw resources. Otherwise:
Reviewed-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys", "MDP5");
if (IS_ERR(mdp5_kms->mmio)) {
ret = PTR_ERR(mdp5_kms->mmio);
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
index 88120c5..52914ec 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
@@ -27,6 +27,8 @@
#include "mdp5_pipe.h"
#include "mdp5_smp.h"
+struct mdp5_state;
+
struct mdp5_kms {
struct mdp_kms base;
@@ -40,6 +42,11 @@ struct mdp5_kms {
struct mdp5_cfg_handler *cfg;
uint32_t caps; /* MDP capabilities (MDP_CAP_XXX bits) */
+ /**
+ * Global atomic state. Do not access directly, use mdp5_get_state()
+ */
+ struct mdp5_state *state;
+ struct drm_modeset_lock state_lock;
/* mapper-id used to request GEM buffer mapped for scanout: */
int id;
@@ -69,6 +76,21 @@ struct mdp5_kms {
};
#define to_mdp5_kms(x) container_of(x, struct mdp5_kms, base)
+/* Global atomic state for tracking resources that are shared across
+ * multiple kms objects (planes/crtcs/etc).
+ *
+ * For atomic updates which require modifying global state,
+ */
+struct mdp5_state {
+ uint32_t dummy;
+};
+
+struct mdp5_state *__must_check
+mdp5_get_state(struct drm_atomic_state *s);
+
+/* Atomic plane state. Subclasses the base drm_plane_state in order to
+ * track assigned hwpipe and hw specific state.
+ */
struct mdp5_plane_state {
struct drm_plane_state base;
--
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