[Intel-gfx] [PATCH 10/37] drm/doc: vblank cleanup
Daniel Vetter
daniel.vetter at ffwll.ch
Wed May 24 14:51:45 UTC 2017
Unify and review everything, plus make sure it's all correct markup.
Drop the kernel-doc for internal functions. Also rework the overview
section, it's become rather outdated.
Unfortuantely the kernel-doc in drm_driver isn't rendered yet, but
that will change as soon as drm_driver is kernel-docified properly.
Also document properly that drm_vblank_cleanup is optional, the core
calls this already.
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
Documentation/gpu/drm-kms.rst | 56 +--------------
drivers/gpu/drm/drm_vblank.c | 157 ++++++++++++++++++++----------------------
include/drm/drmP.h | 37 ++++++++--
include/drm/drm_crtc.h | 3 +
4 files changed, 112 insertions(+), 141 deletions(-)
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 0749000ab3d7..307284125d7a 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -551,60 +551,8 @@ various modules/drivers.
Vertical Blanking
=================
-Vertical blanking plays a major role in graphics rendering. To achieve
-tear-free display, users must synchronize page flips and/or rendering to
-vertical blanking. The DRM API offers ioctls to perform page flips
-synchronized to vertical blanking and wait for vertical blanking.
-
-The DRM core handles most of the vertical blanking management logic,
-which involves filtering out spurious interrupts, keeping race-free
-blanking counters, coping with counter wrap-around and resets and
-keeping use counts. It relies on the driver to generate vertical
-blanking interrupts and optionally provide a hardware vertical blanking
-counter. Drivers must implement the following operations.
-
-- int (\*enable_vblank) (struct drm_device \*dev, int crtc); void
- (\*disable_vblank) (struct drm_device \*dev, int crtc);
- Enable or disable vertical blanking interrupts for the given CRTC.
-
-- u32 (\*get_vblank_counter) (struct drm_device \*dev, int crtc);
- Retrieve the value of the vertical blanking counter for the given
- CRTC. If the hardware maintains a vertical blanking counter its value
- should be returned. Otherwise drivers can use the
- :c:func:`drm_vblank_count()` helper function to handle this
- operation.
-
-Drivers must initialize the vertical blanking handling core with a call
-to :c:func:`drm_vblank_init()` in their load operation.
-
-Vertical blanking interrupts can be enabled by the DRM core or by
-drivers themselves (for instance to handle page flipping operations).
-The DRM core maintains a vertical blanking use count to ensure that the
-interrupts are not disabled while a user still needs them. To increment
-the use count, drivers call :c:func:`drm_vblank_get()`. Upon
-return vertical blanking interrupts are guaranteed to be enabled.
-
-To decrement the use count drivers call
-:c:func:`drm_vblank_put()`. Only when the use count drops to zero
-will the DRM core disable the vertical blanking interrupts after a delay
-by scheduling a timer. The delay is accessible through the
-vblankoffdelay module parameter or the ``drm_vblank_offdelay`` global
-variable and expressed in milliseconds. Its default value is 5000 ms.
-Zero means never disable, and a negative value means disable
-immediately. Drivers may override the behaviour by setting the
-:c:type:`struct drm_device <drm_device>`
-vblank_disable_immediate flag, which when set causes vblank interrupts
-to be disabled immediately regardless of the drm_vblank_offdelay
-value. The flag should only be set if there's a properly working
-hardware vblank counter present.
-
-When a vertical blanking interrupt occurs drivers only need to call the
-:c:func:`drm_handle_vblank()` function to account for the
-interrupt.
-
-Resources allocated by :c:func:`drm_vblank_init()` must be freed
-with a call to :c:func:`drm_vblank_cleanup()` in the driver unload
-operation handler.
+.. kernel-doc:: drivers/gpu/drm/drm_vblank.c
+ :doc: vblank handling
Vertical Blanking and Interrupt Handling Functions Reference
------------------------------------------------------------
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 463e4d81fb0d..73023d463dc7 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -31,6 +31,41 @@
#include "drm_trace.h"
#include "drm_internal.h"
+/**
+ * DOC: vblank handling
+ *
+ * Vertical blanking plays a major role in graphics rendering. To achieve
+ * tear-free display, users must synchronize page flips and/or rendering to
+ * vertical blanking. The DRM API offers ioctls to perform page flips
+ * synchronized to vertical blanking and wait for vertical blanking.
+ *
+ * The DRM core handles most of the vertical blanking management logic, which
+ * involves filtering out spurious interrupts, keeping race-free blanking
+ * counters, coping with counter wrap-around and resets and keeping use counts.
+ * It relies on the driver to generate vertical blanking interrupts and
+ * optionally provide a hardware vertical blanking counter.
+ *
+ * Drivers must initialize the vertical blanking handling core with a call to
+ * drm_vblank_init(). Minimally, a driver needs to implement
+ * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call
+ * drm_crtc_handle_vblank() in it's vblank interrupt handler for working vblank
+ * support.
+ *
+ * Vertical blanking interrupts can be enabled by the DRM core or by drivers
+ * themselves (for instance to handle page flipping operations). The DRM core
+ * maintains a vertical blanking use count to ensure that the interrupts are not
+ * disabled while a user still needs them. To increment the use count, drivers
+ * call drm_crtc_vblank_get() and release the vblank reference again with
+ * drm_crtc_vblank_put(). In between these two calls vblank interrupts are
+ * guaranteed to be enabled.
+ *
+ * On many hardware disabling the vblank interrupt cannot be done in a race-free
+ * manner, see &drm_driver.vblank_disable_immediate and
+ * &drm_driver.max_vblank_count. In that case the vblank core only disables the
+ * vblanks after a timer has expired, which can be configured through the
+ * ``vblankoffdelay`` module parameter.
+ */
+
/* Retry timestamp calculation up to 3 times to satisfy
* drm_timestamp_precision before giving up.
*/
@@ -262,11 +297,12 @@ static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
* drm_accurate_vblank_count - retrieve the master vblank counter
* @crtc: which counter to retrieve
*
- * This function is similar to @drm_crtc_vblank_count but this
- * function interpolates to handle a race with vblank irq's.
+ * This function is similar to drm_crtc_vblank_count() but this function
+ * interpolates to handle a race with vblank interrupts using the high precision
+ * timestamping support.
*
- * This is mostly useful for hardware that can obtain the scanout
- * position, but doesn't have a frame counter.
+ * This is mostly useful for hardware that can obtain the scanout position, but
+ * doesn't have a hardware frame counter.
*/
u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
{
@@ -362,10 +398,14 @@ static void vblank_disable_fn(unsigned long arg)
* drm_vblank_cleanup - cleanup vblank support
* @dev: DRM device
*
- * This function cleans up any resources allocated in drm_vblank_init.
+ * This function cleans up any resources allocated in drm_vblank_init(). It is
+ * called by the DRM core when @dev is finalized.
+ *
+ * Drivers can call drm_vblank_cleanup() if they need to quiescent the vblank
+ * interrupt in their unload code. But in general this should be handled by
+ * disabling all active &drm_crtc through e.g. drm_atomic_helper_shutdown, which
+ * should end up calling drm_crtc_vblank_off().
*
- * Drivers which don't use drm_irq_install() need to set &drm_device.irq_enabled
- * themselves, to signal to the DRM core that vblank interrupts are enabled.
*/
void drm_vblank_cleanup(struct drm_device *dev)
{
@@ -396,6 +436,8 @@ EXPORT_SYMBOL(drm_vblank_cleanup);
* @num_crtcs: number of CRTCs supported by @dev
*
* This function initializes vblank support for @num_crtcs display pipelines.
+ * Drivers do not need to call drm_vblank_cleanup(), cleanup is already handled
+ * by the DRM core.
*
* Returns:
* Zero on success or a negative error code on failure.
@@ -468,11 +510,11 @@ EXPORT_SYMBOL(drm_crtc_vblank_waitqueue);
* @crtc: drm_crtc whose timestamp constants should be updated.
* @mode: display mode containing the scanout timings
*
- * Calculate and store various constants which are later
- * needed by vblank and swap-completion timestamping, e.g,
- * by drm_calc_vbltimestamp_from_scanoutpos(). They are
- * derived from CRTC's true scanout timing, so they take
- * things like panel scaling or other adjustments into account.
+ * Calculate and store various constants which are later needed by vblank and
+ * swap-completion timestamping, e.g, by
+ * drm_calc_vbltimestamp_from_scanoutpos(). They are derived from CRTC's true
+ * scanout timing, so they take things like panel scaling or other adjustments
+ * into account.
*/
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode)
@@ -535,25 +577,14 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
* if flag is set.
*
* Implements calculation of exact vblank timestamps from given drm_display_mode
- * timings and current video scanout position of a CRTC. This can be called from
- * within get_vblank_timestamp() implementation of a kms driver to implement the
- * actual timestamping.
- *
- * Should return timestamps conforming to the OML_sync_control OpenML
- * extension specification. The timestamp corresponds to the end of
- * the vblank interval, aka start of scanout of topmost-leftmost display
- * pixel in the following video frame.
- *
- * Requires support for optional dev->driver->get_scanout_position()
- * in kms driver, plus a bit of setup code to provide a drm_display_mode
- * that corresponds to the true scanout timing.
- *
- * The current implementation only handles standard video modes. It
- * returns as no operation if a doublescan or interlaced video mode is
- * active. Higher level code is expected to handle this.
+ * timings and current video scanout position of a CRTC. This can be directly
+ * used as the &drm_driver.get_vblank_timestamp implementation of a kms driver
+ * if &drm_driver.get_scanout_position is implemented.
*
- * This function can be used to implement the &drm_driver.get_vblank_timestamp
- * directly, if the driver implements the &drm_driver.get_scanout_position hook.
+ * The current implementation only handles standard video modes. For double scan
+ * and interlaced modes the driver is supposed to adjust the hardware mode
+ * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to
+ * match the scanout position reported.
*
* Note that atomic drivers must call drm_calc_timestamping_constants() before
* enabling a CRTC. The atomic helpers already take care of that in
@@ -738,7 +769,9 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
*
* Fetches the "cooked" vblank count value that represents the number of
* vblank events since the system was booted, including lost events due to
- * modesetting activity.
+ * modesetting activity. Note that this timer isn't correct against a racing
+ * vblank interrupt (since it only reports the software vblank counter), see
+ * drm_accurate_vblank_count() for such use-cases.
*
* Returns:
* The software vblank counter.
@@ -749,20 +782,6 @@ u32 drm_crtc_vblank_count(struct drm_crtc *crtc)
}
EXPORT_SYMBOL(drm_crtc_vblank_count);
-/**
- * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the
- * system timestamp corresponding to that vblank counter value.
- * @dev: DRM device
- * @pipe: index of CRTC whose counter to retrieve
- * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
- *
- * Fetches the "cooked" vblank count value that represents the number of
- * vblank events since the system was booted, including lost events due to
- * modesetting activity. Returns corresponding system timestamp of the time
- * of the vblank interval that corresponds to the current vblank counter value.
- *
- * This is the legacy version of drm_crtc_vblank_count_and_time().
- */
static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
struct timeval *vblanktime)
{
@@ -852,8 +871,8 @@ static void send_vblank_event(struct drm_device *dev,
* handler by calling drm_crtc_send_vblank_event() and make sure that there's no
* possible race with the hardware committing the atomic update.
*
- * Caller must hold event lock. Caller must also hold a vblank reference for
- * the event @e, which will be dropped when the next vblank arrives.
+ * Caller must hold a vblank reference for the event @e, which will be dropped
+ * when the next vblank arrives.
*/
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
struct drm_pending_vblank_event *e)
@@ -913,14 +932,6 @@ static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
return dev->driver->enable_vblank(dev, pipe);
}
-/**
- * drm_vblank_enable - enable the vblank interrupt on a CRTC
- * @dev: DRM device
- * @pipe: CRTC index
- *
- * Returns:
- * Zero on success or a negative error code on failure.
- */
static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
@@ -958,19 +969,6 @@ static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
return ret;
}
-/**
- * drm_vblank_get - get a reference count on vblank events
- * @dev: DRM device
- * @pipe: index of CRTC to own
- *
- * Acquire a reference count on vblank events to avoid having them disabled
- * while in use.
- *
- * This is the legacy version of drm_crtc_vblank_get().
- *
- * Returns:
- * Zero on success or a negative error code on failure.
- */
static int drm_vblank_get(struct drm_device *dev, unsigned int pipe)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
@@ -1014,16 +1012,6 @@ int drm_crtc_vblank_get(struct drm_crtc *crtc)
}
EXPORT_SYMBOL(drm_crtc_vblank_get);
-/**
- * drm_vblank_put - release ownership of vblank events
- * @dev: DRM device
- * @pipe: index of CRTC to release
- *
- * Release ownership of a given vblank counter, turning off interrupts
- * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
- *
- * This is the legacy version of drm_crtc_vblank_put().
- */
static void drm_vblank_put(struct drm_device *dev, unsigned int pipe)
{
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
@@ -1067,6 +1055,8 @@ EXPORT_SYMBOL(drm_crtc_vblank_put);
* This waits for one vblank to pass on @pipe, using the irq driver interfaces.
* It is a failure to call this when the vblank irq for @pipe is disabled, e.g.
* due to lack of driver support or because the crtc is off.
+ *
+ * This is the legacy version of drm_crtc_wait_one_vblank().
*/
void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe)
{
@@ -1116,7 +1106,7 @@ EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
* stored so that drm_vblank_on can restore it again.
*
* Drivers must use this function when the hardware vblank counter can get
- * reset, e.g. when suspending.
+ * reset, e.g. when suspending or disabling the @crtc in general.
*/
void drm_crtc_vblank_off(struct drm_crtc *crtc)
{
@@ -1184,6 +1174,8 @@ EXPORT_SYMBOL(drm_crtc_vblank_off);
* drm_crtc_vblank_on() functions. The difference compared to
* drm_crtc_vblank_off() is that this function doesn't save the vblank counter
* and hence doesn't need to call any driver hooks.
+ *
+ * This is useful for recovering driver state e.g. on driver load, or on resume.
*/
void drm_crtc_vblank_reset(struct drm_crtc *crtc)
{
@@ -1212,9 +1204,10 @@ EXPORT_SYMBOL(drm_crtc_vblank_reset);
* @crtc: CRTC in question
*
* This functions restores the vblank interrupt state captured with
- * drm_crtc_vblank_off() again. Note that calls to drm_crtc_vblank_on() and
- * drm_crtc_vblank_off() can be unbalanced and so can also be unconditionally called
- * in driver load code to reflect the current hardware state of the crtc.
+ * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note
+ * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be
+ * unbalanced and so can also be unconditionally called in driver load code to
+ * reflect the current hardware state of the crtc.
*/
void drm_crtc_vblank_on(struct drm_crtc *crtc)
{
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 39df16af7a4a..3aa3809ab524 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -387,22 +387,49 @@ struct drm_device {
bool irq_enabled;
int irq;
- /*
+ /**
+ * @vblank_disable_immediate:
+ *
* If true, vblank interrupt will be disabled immediately when the
* refcount drops to zero, as opposed to via the vblank disable
* timer.
- * This can be set to true it the hardware has a working vblank
- * counter and the driver uses drm_vblank_on() and drm_vblank_off()
- * appropriately.
+ *
+ * This can be set to true it the hardware has a working vblank counter
+ * with high-precision timestamping (otherwise there are races) and the
+ * driver uses drm_crtc_vblank_on() and drm_crtc_vblank_off()
+ * appropriately. See also @max_vblank_count and
+ * &drm_crtc_funcs.get_vblank_counter.
*/
bool vblank_disable_immediate;
- /* array of size num_crtcs */
+ /**
+ * @vblank:
+ *
+ * Array of vblank tracking structures, one per &struct drm_crtc. For
+ * historical reasons (vblank support predates kernel modesetting) this
+ * is free-standing and not part of &struct drm_crtc itself. It must be
+ * initialized explicitly by calling drm_vblank_init().
+ */
struct drm_vblank_crtc *vblank;
spinlock_t vblank_time_lock; /**< Protects vblank count and time updates during vblank enable/disable */
spinlock_t vbl_lock;
+ /**
+ * @max_vblank_count:
+ *
+ * Maximum value of the vblank registers. This value +1 will result in a
+ * wrap-around of the vblank register. It is used by the vblank core to
+ * handle wrap-arounds.
+ *
+ * If set to zero the vblank core will try to guess the elapsed vblanks
+ * between times when the vblank interrupt is disabled through
+ * high-precision timestamps. That approach is suffering from small
+ * races and imprecision over longer time periods, hence exposing a
+ * hardware vblank counter is always recommended.
+ *
+ * If non-zeor, &drm_crtc_funcs.get_vblank_counter must be set.
+ */
u32 max_vblank_count; /**< size of vblank counter register */
/**
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index b6e3713bd7a9..5f5d53973ca5 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -683,6 +683,9 @@ struct drm_crtc_funcs {
* drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
* enabling a CRTC.
*
+ * See also &drm_device.vblank_disable_immediate and
+ * &drm_device.max_vblank_count.
+ *
* Returns:
*
* Raw vblank counter value.
--
2.11.0
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