[Intel-gfx] [RFC 3/4] drm/i915/gen9: Expose top-most universal plane as cursor
Matt Roper
matthew.d.roper at intel.com
Wed Oct 26 22:51:30 UTC 2016
Gen9 has a traditional cursor plane that is mutually exclusive with the
system's top-most "universal" plane; it seems likely that two planes are
really a single shared hardware unit with two different register
interfaces. Thus far i915 has exposed a cursor plane to userspace
that's hooked up to the old-style cursor registers; we just pretended
that the top-most universal plane didn't exist and reported one fewer
"sprite/overlay" planes for each pipe than the platform technically has.
Let's switch this around so that the cursor exposed to userspace is
actually wired up to top-most universal plane registers. We'll continue
to present the same cursor ABI to userspace that we always have, but
internally we'll just be programming a different set of registers and
doing so in a way that's more consistent with how all the other gen9
planes work --- less cursor-specific special cases throughout the code.
Aside from making the code a bit simpler (fewer cursor-specific special
cases), this will also pave the way to eventually exposing the top-most
plane in a more full-featured manner to userspace clients that don't
need a traditional cursor and wish to opt into having access to an
additional sprite/overlay-style plane instead.
It's worth noting that a lot of the special-cased cursor-specific code
was in the gen9 watermark programming. It's good to simplify that code,
but we should keep an eye out for any unwanted side effects of this
patch; since sprites/overlays tend to get used less than cursors, it's
possible that this could help us uncover additional underruns that
nobody had run across yet. Or it could have the opposite effect and
eliminate some of the underruns that we haven't been able to get rid of
yet.
Cc: Bob Paauwe <bob.j.paauwe at intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Lyude Paul <lyude at redhat.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 --
drivers/gpu/drm/i915/i915_drv.h | 11 +++-
drivers/gpu/drm/i915/intel_device_info.c | 38 +++++++++----
drivers/gpu/drm/i915/intel_display.c | 97 ++++++++++++--------------------
drivers/gpu/drm/i915/intel_drv.h | 7 +++
drivers/gpu/drm/i915/intel_pm.c | 85 ++++------------------------
drivers/gpu/drm/i915/intel_sprite.c | 6 +-
7 files changed, 93 insertions(+), 155 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 9f5a392..0bba472 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3469,10 +3469,6 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
entry->start, entry->end,
skl_ddb_entry_size(entry));
}
-
- entry = &ddb->plane[pipe][PLANE_CURSOR];
- seq_printf(m, " %-13s%8u%8u%8u\n", "Cursor", entry->start,
- entry->end, skl_ddb_entry_size(entry));
}
drm_modeset_unlock_all(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4714051..83aaed2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -178,7 +178,7 @@ enum plane {
PLANE_A = 0,
PLANE_B,
PLANE_C,
- PLANE_CURSOR,
+ PLANE_D,
I915_MAX_PLANES,
};
#define plane_name(p) ((p) + 'A')
@@ -316,9 +316,15 @@ struct i915_hotplug {
for ((__p) = 0; \
(__p) < INTEL_INFO(__dev_priv)->num_sprites[(__pipe)] + 1; \
(__p)++)
+
+/*
+ * Only iterate over sprites exposed as sprites; omit sprites that
+ * are being repurposed to simulate a cursor.
+ */
#define for_each_sprite(__dev_priv, __p, __s) \
for ((__s) = 0; \
- (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)]; \
+ (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)] - \
+ (INTEL_INFO(__dev_priv)->has_real_cursor ? 0 : 1); \
(__s)++)
#define for_each_port_masked(__port, __ports_mask) \
@@ -687,6 +693,7 @@ struct intel_csr {
func(has_psr); \
func(has_rc6); \
func(has_rc6p); \
+ func(has_real_cursor); \
func(has_resource_streamer); \
func(has_runtime_pm); \
func(has_snoop); \
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index d6a8f11..a464e0e 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -271,23 +271,39 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
enum pipe pipe;
/*
- * Skylake and Broxton currently don't expose the topmost plane as its
- * use is exclusive with the legacy cursor and we only want to expose
- * one of those, not both. Until we can safely expose the topmost plane
- * as a DRM_PLANE_TYPE_CURSOR with all the features exposed/supported,
- * we don't expose the topmost plane at all to prevent ABI breakage
- * down the line.
+ * Gen9 platforms have a top-most universal (i.e., sprite) plane and a
+ * cursor plane that are mutually exclusive. If we use the cursor
+ * plane we permanently lose the ability to make use of the more
+ * full-featured universal plane. So instead let's use all of the
+ * universal planes, ignore the cursor plane, but hook the top-most
+ * universal plane up to the legacy cursor ioctl's and expose it to
+ * userspace as DRM_PLANE_TYPE_CURSOR. This won't result in any
+ * visible behavior change to userspace; we're just internally
+ * programming a different set of registers.
+ *
+ * For the purposes of device_info, we're only concerned with the
+ * number of universal planes we're programming, regardless of how they
+ * get mapped to userspace interfaces, so we'll report the true number of
+ * universal planes for gen9.
*/
if (IS_BROXTON(dev_priv)) {
- info->num_sprites[PIPE_A] = 2;
- info->num_sprites[PIPE_B] = 2;
- info->num_sprites[PIPE_C] = 1;
- } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+ info->has_real_cursor = 0;
+ info->num_sprites[PIPE_A] = 3;
+ info->num_sprites[PIPE_B] = 3;
+ info->num_sprites[PIPE_C] = 2;
+ } else if (IS_GEN9(dev_priv)) {
+ info->has_real_cursor = 0;
for_each_pipe(dev_priv, pipe)
info->num_sprites[pipe] = 2;
- else
+ } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+ info->has_real_cursor = 1;
+ for_each_pipe(dev_priv, pipe)
+ info->num_sprites[pipe] = 2;
+ } else {
+ info->has_real_cursor = 1;
for_each_pipe(dev_priv, pipe)
info->num_sprites[pipe] = 1;
+ }
if (i915.disable_display) {
DRM_INFO("Display disabled (module parameter)\n");
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cb7dd11..9a8c2b1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1232,6 +1232,23 @@ void assert_panel_unlocked(struct drm_i915_private *dev_priv, enum pipe pipe)
pipe_name(pipe));
}
+/*
+ * Cursor state for platforms that use a universal plane as a cursor.
+ * Primary is universal #0, others are universal #1-numsprites. Cursor
+ * will be the final universal plane for the pipe.
+ */
+static bool
+universal_cursor_state(struct drm_i915_private *dev_priv,
+ enum pipe pipe)
+{
+ unsigned int planenum = INTEL_INFO(dev_priv)->num_sprites[pipe];
+ u32 val;
+
+ val = I915_READ(PLANE_CTL(pipe, planenum));
+
+ return val & PLANE_CTL_ENABLE;
+}
+
static void assert_cursor(struct drm_i915_private *dev_priv,
enum pipe pipe, bool state)
{
@@ -1239,6 +1256,8 @@ static void assert_cursor(struct drm_i915_private *dev_priv,
if (IS_845G(dev_priv) || IS_I865G(dev_priv))
cur_state = I915_READ(CURCNTR(PIPE_A)) & CURSOR_ENABLE;
+ else if (!INTEL_INFO(dev_priv)->has_real_cursor)
+ cur_state = universal_cursor_state(dev_priv, pipe);
else
cur_state = I915_READ(CURCNTR(pipe)) & CURSOR_MODE;
@@ -10841,15 +10860,16 @@ static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base,
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
- struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
- const struct skl_wm_values *wm = &dev_priv->wm.skl_results;
- const struct skl_plane_wm *p_wm =
- &cstate->wm.skl.optimal.planes[PLANE_CURSOR];
int pipe = intel_crtc->pipe;
uint32_t cntl = 0;
- if (INTEL_GEN(dev_priv) >= 9 && wm->dirty_pipes & drm_crtc_mask(crtc))
- skl_write_cursor_wm(intel_crtc, p_wm, &wm->ddb);
+ /*
+ * Although gen9 has legacy cursor registers, their use is mutually
+ * exclusive with the top-most universal plane. We'll just use the
+ * universal plane to simulate the legacy cursor interface instead,
+ * which means we'll never enter here on gen9 platforms.
+ */
+ WARN_ON(IS_GEN9(dev_priv));
if (plane_state && plane_state->base.visible) {
cntl = MCURSOR_GAMMA_ENABLE;
@@ -13528,56 +13548,6 @@ static void verify_wm_state(struct drm_crtc *crtc,
hw_ddb_entry->start, hw_ddb_entry->end);
}
}
-
- /*
- * cursor
- * If the cursor plane isn't active, we may not have updated it's ddb
- * allocation. In that case since the ddb allocation will be updated
- * once the plane becomes visible, we can skip this check
- */
- if (intel_crtc->cursor_addr) {
- hw_plane_wm = &hw_wm.planes[PLANE_CURSOR];
- sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];
-
- /* Watermarks */
- for (level = 0; level <= max_level; level++) {
- if (skl_wm_level_equals(&hw_plane_wm->wm[level],
- &sw_plane_wm->wm[level]))
- continue;
-
- DRM_ERROR("mismatch in WM pipe %c cursor level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
- pipe_name(pipe), level,
- sw_plane_wm->wm[level].plane_en,
- sw_plane_wm->wm[level].plane_res_b,
- sw_plane_wm->wm[level].plane_res_l,
- hw_plane_wm->wm[level].plane_en,
- hw_plane_wm->wm[level].plane_res_b,
- hw_plane_wm->wm[level].plane_res_l);
- }
-
- if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
- &sw_plane_wm->trans_wm)) {
- DRM_ERROR("mismatch in trans WM pipe %c cursor (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
- pipe_name(pipe),
- sw_plane_wm->trans_wm.plane_en,
- sw_plane_wm->trans_wm.plane_res_b,
- sw_plane_wm->trans_wm.plane_res_l,
- hw_plane_wm->trans_wm.plane_en,
- hw_plane_wm->trans_wm.plane_res_b,
- hw_plane_wm->trans_wm.plane_res_l);
- }
-
- /* DDB */
- hw_ddb_entry = &hw_ddb.plane[pipe][PLANE_CURSOR];
- sw_ddb_entry = &sw_ddb->plane[pipe][PLANE_CURSOR];
-
- if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
- DRM_ERROR("mismatch in DDB state pipe %c cursor (expected (%u,%u), found (%u,%u))\n",
- pipe_name(pipe),
- sw_ddb_entry->start, sw_ddb_entry->end,
- hw_ddb_entry->start, hw_ddb_entry->end);
- }
- }
}
static void
@@ -15215,11 +15185,18 @@ static struct drm_plane *intel_cursor_plane_create(struct drm_device *dev,
cursor->can_scale = false;
cursor->max_downscale = 1;
cursor->pipe = pipe;
- cursor->plane = pipe;
cursor->frontbuffer_bit = INTEL_FRONTBUFFER_CURSOR(pipe);
- cursor->check_plane = intel_check_cursor_plane;
- cursor->update_plane = intel_update_cursor_plane;
- cursor->disable_plane = intel_disable_cursor_plane;
+ if (INTEL_INFO(dev)->has_real_cursor) {
+ cursor->plane = pipe; /* unused? */
+ cursor->check_plane = intel_check_cursor_plane;
+ cursor->update_plane = intel_update_cursor_plane;
+ cursor->disable_plane = intel_disable_cursor_plane;
+ } else {
+ cursor->plane = INTEL_INFO(dev)->num_sprites[pipe] - 1;
+ cursor->check_plane = intel_check_sprite_plane;
+ cursor->update_plane = skl_update_plane;
+ cursor->disable_plane = skl_disable_plane;
+ }
ret = drm_universal_plane_init(dev, &cursor->base, 0,
&intel_plane_funcs,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c31fddd..50874e2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1790,6 +1790,13 @@ int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
struct drm_file *file_priv);
void intel_pipe_update_start(struct intel_crtc *crtc);
void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work);
+int intel_check_sprite_plane(struct drm_plane *plane,
+ struct intel_crtc_state *crtc_state,
+ struct intel_plane_state *state);
+void skl_update_plane(struct drm_plane *drm_plane,
+ const struct intel_crtc_state *crtc_state,
+ const struct intel_plane_state *plane_state);
+void skl_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc);
/* intel_tv.c */
void intel_tv_init(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 6f19e60..e75f6d8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2863,9 +2863,7 @@ bool ilk_disable_lp_wm(struct drm_device *dev)
/*
* Return the index of a plane in the SKL DDB and wm result arrays. Primary
- * plane is always in slot 0, cursor is always in slot I915_MAX_PLANES-1, and
- * other universal planes are in indices 1..n. Note that this may leave unused
- * indices between the top "sprite" plane and the cursor.
+ * plane is always in slot 0 and other universal planes are in indices 1..n.
*/
static int
skl_wm_plane_id(const struct intel_plane *plane)
@@ -2874,7 +2872,6 @@ skl_wm_plane_id(const struct intel_plane *plane)
case DRM_PLANE_TYPE_PRIMARY:
return 0;
case DRM_PLANE_TYPE_CURSOR:
- return PLANE_CURSOR;
case DRM_PLANE_TYPE_OVERLAY:
return plane->plane + 1;
default:
@@ -3128,14 +3125,6 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
alloc->end = alloc->start + pipe_size;
}
-static unsigned int skl_cursor_allocation(int num_active)
-{
- if (num_active == 1)
- return 32;
-
- return 8;
-}
-
static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry, u32 reg)
{
entry->start = reg & 0x3ff;
@@ -3166,10 +3155,6 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
val);
}
- val = I915_READ(CUR_BUF_CFG(pipe));
- skl_ddb_entry_init_from_hw(&ddb->plane[pipe][PLANE_CURSOR],
- val);
-
intel_display_power_put(dev_priv, power_domain);
}
}
@@ -3227,8 +3212,6 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
if (!intel_pstate->base.visible)
return 0;
- if (pstate->plane->type == DRM_PLANE_TYPE_CURSOR)
- return 0;
if (y && format != DRM_FORMAT_NV12)
return 0;
@@ -3386,7 +3369,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
struct drm_plane_state *pstate;
enum pipe pipe = intel_crtc->pipe;
struct skl_ddb_entry *alloc = &cstate->wm.skl.ddb;
- uint16_t alloc_size, start, cursor_blocks;
+ uint16_t alloc_size, start;
uint16_t *minimum = cstate->wm.skl.minimum_blocks;
uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
unsigned int total_data_rate;
@@ -3412,12 +3395,6 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
return 0;
}
- cursor_blocks = skl_cursor_allocation(num_active);
- ddb->plane[pipe][PLANE_CURSOR].start = alloc->end - cursor_blocks;
- ddb->plane[pipe][PLANE_CURSOR].end = alloc->end;
-
- alloc_size -= cursor_blocks;
-
/* 1. Allocate the mininum required blocks for each active plane */
for_each_plane_in_state(state, plane, pstate, i) {
intel_plane = to_intel_plane(plane);
@@ -3431,17 +3408,12 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
y_minimum[id] = 0;
continue;
}
- if (plane->type == DRM_PLANE_TYPE_CURSOR) {
- minimum[id] = 0;
- y_minimum[id] = 0;
- continue;
- }
minimum[id] = skl_ddb_min_alloc(pstate, 0);
y_minimum[id] = skl_ddb_min_alloc(pstate, 1);
}
- for (i = 0; i < PLANE_CURSOR; i++) {
+ for (i = 0; i < I915_MAX_PLANES; i++) {
alloc_size -= minimum[i];
alloc_size -= y_minimum[i];
}
@@ -3866,26 +3838,6 @@ void skl_write_plane_wm(struct intel_crtc *intel_crtc,
&ddb->y_plane[pipe][plane]);
}
-void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
- const struct skl_plane_wm *wm,
- const struct skl_ddb_allocation *ddb)
-{
- struct drm_crtc *crtc = &intel_crtc->base;
- struct drm_device *dev = crtc->dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
- int level, max_level = ilk_wm_max_level(dev_priv);
- enum pipe pipe = intel_crtc->pipe;
-
- for (level = 0; level <= max_level; level++) {
- skl_write_wm_level(dev_priv, CUR_WM(pipe, level),
- &wm->wm[level]);
- }
- skl_write_wm_level(dev_priv, CUR_WM_TRANS(pipe), &wm->trans_wm);
-
- skl_ddb_entry_write(dev_priv, CUR_BUF_CFG(pipe),
- &ddb->plane[pipe][PLANE_CURSOR]);
-}
-
bool skl_wm_level_equals(const struct skl_wm_level *l1,
const struct skl_wm_level *l2)
{
@@ -4122,19 +4074,11 @@ skl_print_wm_changes(const struct drm_atomic_state *state)
if (skl_ddb_entry_equal(old, new))
continue;
- if (id != PLANE_CURSOR) {
- DRM_DEBUG_ATOMIC("[PLANE:%d:plane %d%c] ddb (%d - %d) -> (%d - %d)\n",
- plane->base.id, id + 1,
- pipe_name(pipe),
- old->start, old->end,
- new->start, new->end);
- } else {
- DRM_DEBUG_ATOMIC("[PLANE:%d:cursor %c] ddb (%d - %d) -> (%d - %d)\n",
- plane->base.id,
- pipe_name(pipe),
- old->start, old->end,
- new->start, new->end);
- }
+ DRM_DEBUG_ATOMIC("[PLANE:%d:plane %d%c] ddb (%d - %d) -> (%d - %d)\n",
+ plane->base.id, id + 1,
+ pipe_name(pipe),
+ old->start, old->end,
+ new->start, new->end);
}
}
}
@@ -4235,9 +4179,6 @@ static void skl_update_wm(struct drm_crtc *crtc)
for_each_universal_plane(dev_priv, pipe, plane)
skl_write_plane_wm(intel_crtc, &pipe_wm->planes[plane],
&results->ddb, plane);
-
- skl_write_cursor_wm(intel_crtc, &pipe_wm->planes[PLANE_CURSOR],
- &results->ddb);
}
skl_copy_wm_for_pipe(hw_vals, results, pipe);
@@ -4350,18 +4291,12 @@ void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc,
wm = &out->planes[id];
for (level = 0; level <= max_level; level++) {
- if (id != PLANE_CURSOR)
- val = I915_READ(PLANE_WM(pipe, id, level));
- else
- val = I915_READ(CUR_WM(pipe, level));
+ val = I915_READ(PLANE_WM(pipe, id, level));
skl_wm_level_from_reg_val(val, &wm->wm[level]);
}
- if (id != PLANE_CURSOR)
- val = I915_READ(PLANE_WM_TRANS(pipe, id));
- else
- val = I915_READ(CUR_WM_TRANS(pipe));
+ val = I915_READ(PLANE_WM_TRANS(pipe, id));
skl_wm_level_from_reg_val(val, &wm->trans_wm);
}
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 43d0350..9e6406a 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -194,7 +194,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
}
}
-static void
+void
skl_update_plane(struct drm_plane *drm_plane,
const struct intel_crtc_state *crtc_state,
const struct intel_plane_state *plane_state)
@@ -285,7 +285,7 @@ skl_update_plane(struct drm_plane *drm_plane,
POSTING_READ(PLANE_SURF(pipe, plane));
}
-static void
+void
skl_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
{
struct drm_device *dev = dplane->dev;
@@ -752,7 +752,7 @@ ilk_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
POSTING_READ(DVSSURF(pipe));
}
-static int
+int
intel_check_sprite_plane(struct drm_plane *plane,
struct intel_crtc_state *crtc_state,
struct intel_plane_state *state)
--
2.1.4
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