drm/radeon: document radeon_fence.c (v2)
Adds documentation to most of the functions in radeon_fence.c v2: address Christian's comments: - split common concept description into it's own comment - fix description of intr parameter - Improve description of -EDEADLK error Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
parent
abf1dc67cb
commit
d66b7ec24a
|
@ -40,6 +40,26 @@
|
|||
#include "radeon.h"
|
||||
#include "radeon_trace.h"
|
||||
|
||||
/*
|
||||
* Fences
|
||||
* Fences mark an event in the GPUs pipeline and are used
|
||||
* for GPU/CPU synchronization. When the fence is written,
|
||||
* it is expected that all buffers associated with that fence
|
||||
* are no longer in use by the associated ring on the GPU and
|
||||
* that the the relevant GPU caches have been flushed. Whether
|
||||
* we use a scratch register or memory location depends on the asic
|
||||
* and whether writeback is enabled.
|
||||
*/
|
||||
|
||||
/**
|
||||
* radeon_fence_write - write a fence value
|
||||
*
|
||||
* @rdev: radeon_device pointer
|
||||
* @seq: sequence number to write
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Writes a fence value to memory or a scratch register (all asics).
|
||||
*/
|
||||
static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring)
|
||||
{
|
||||
struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
|
||||
|
@ -50,6 +70,15 @@ static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring)
|
|||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_read - read a fence value
|
||||
*
|
||||
* @rdev: radeon_device pointer
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Reads a fence value from memory or a scratch register (all asics).
|
||||
* Returns the value of the fence read from memory or register.
|
||||
*/
|
||||
static u32 radeon_fence_read(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
|
||||
|
@ -63,6 +92,16 @@ static u32 radeon_fence_read(struct radeon_device *rdev, int ring)
|
|||
return seq;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_emit - emit a fence on the requested ring
|
||||
*
|
||||
* @rdev: radeon_device pointer
|
||||
* @fence: radeon fence object
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Emits a fence command on the requested ring (all asics).
|
||||
* Returns 0 on success, -ENOMEM on failure.
|
||||
*/
|
||||
int radeon_fence_emit(struct radeon_device *rdev,
|
||||
struct radeon_fence **fence,
|
||||
int ring)
|
||||
|
@ -81,6 +120,15 @@ int radeon_fence_emit(struct radeon_device *rdev,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_process - process a fence
|
||||
*
|
||||
* @rdev: radeon_device pointer
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Checks the current fence value and wakes the fence queue
|
||||
* if the sequence number has increased (all asics).
|
||||
*/
|
||||
void radeon_fence_process(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
uint64_t seq, last_seq;
|
||||
|
@ -141,6 +189,13 @@ void radeon_fence_process(struct radeon_device *rdev, int ring)
|
|||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_destroy - destroy a fence
|
||||
*
|
||||
* @kref: fence kref
|
||||
*
|
||||
* Frees the fence object (all asics).
|
||||
*/
|
||||
static void radeon_fence_destroy(struct kref *kref)
|
||||
{
|
||||
struct radeon_fence *fence;
|
||||
|
@ -149,6 +204,20 @@ static void radeon_fence_destroy(struct kref *kref)
|
|||
kfree(fence);
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_seq_signaled - check if a fence sequeuce number has signaled
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @seq: sequence number
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Check if the last singled fence sequnce number is >= the requested
|
||||
* sequence number (all asics).
|
||||
* Returns true if the fence has signaled (current fence value
|
||||
* is >= requested value) or false if it has not (current fence
|
||||
* value is < the requested value. Helper function for
|
||||
* radeon_fence_signaled().
|
||||
*/
|
||||
static bool radeon_fence_seq_signaled(struct radeon_device *rdev,
|
||||
u64 seq, unsigned ring)
|
||||
{
|
||||
|
@ -163,6 +232,14 @@ static bool radeon_fence_seq_signaled(struct radeon_device *rdev,
|
|||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_signaled - check if a fence has signaled
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
*
|
||||
* Check if the requested fence has signaled (all asics).
|
||||
* Returns true if the fence has signaled or false if it has not.
|
||||
*/
|
||||
bool radeon_fence_signaled(struct radeon_fence *fence)
|
||||
{
|
||||
if (!fence) {
|
||||
|
@ -178,6 +255,24 @@ bool radeon_fence_signaled(struct radeon_fence *fence)
|
|||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_wait_seq - wait for a specific sequence number
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @target_seq: sequence number we want to wait for
|
||||
* @ring: ring index the fence is associated with
|
||||
* @intr: use interruptable sleep
|
||||
* @lock_ring: whether the ring should be locked or not
|
||||
*
|
||||
* Wait for the requested sequence number to be written (all asics).
|
||||
* @intr selects whether to use interruptable (true) or non-interruptable
|
||||
* (false) sleep when waiting for the sequence number. Helper function
|
||||
* for radeon_fence_wait(), et al.
|
||||
* Returns 0 if the sequence number has passed, error for all other cases.
|
||||
* -EDEADLK is returned when a GPU lockup has been detected and the ring is
|
||||
* marked as not ready so no further jobs get scheduled until a successful
|
||||
* reset.
|
||||
*/
|
||||
static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq,
|
||||
unsigned ring, bool intr, bool lock_ring)
|
||||
{
|
||||
|
@ -273,6 +368,17 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_wait - wait for a fence to signal
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
* @intr: use interruptable sleep
|
||||
*
|
||||
* Wait for the requested fence to signal (all asics).
|
||||
* @intr selects whether to use interruptable (true) or non-interruptable
|
||||
* (false) sleep when waiting for the fence.
|
||||
* Returns 0 if the fence has passed, error for all other cases.
|
||||
*/
|
||||
int radeon_fence_wait(struct radeon_fence *fence, bool intr)
|
||||
{
|
||||
int r;
|
||||
|
@ -303,6 +409,20 @@ bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)
|
|||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_wait_any_seq - wait for a sequence number on any ring
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @target_seq: sequence number(s) we want to wait for
|
||||
* @intr: use interruptable sleep
|
||||
*
|
||||
* Wait for the requested sequence number(s) to be written by any ring
|
||||
* (all asics). Sequnce number array is indexed by ring id.
|
||||
* @intr selects whether to use interruptable (true) or non-interruptable
|
||||
* (false) sleep when waiting for the sequence number. Helper function
|
||||
* for radeon_fence_wait_any(), et al.
|
||||
* Returns 0 if the sequence number has passed, error for all other cases.
|
||||
*/
|
||||
static int radeon_fence_wait_any_seq(struct radeon_device *rdev,
|
||||
u64 *target_seq, bool intr)
|
||||
{
|
||||
|
@ -412,6 +532,19 @@ static int radeon_fence_wait_any_seq(struct radeon_device *rdev,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_wait_any - wait for a fence to signal on any ring
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @fences: radeon fence object(s)
|
||||
* @intr: use interruptable sleep
|
||||
*
|
||||
* Wait for any requested fence to signal (all asics). Fence
|
||||
* array is indexed by ring id. @intr selects whether to use
|
||||
* interruptable (true) or non-interruptable (false) sleep when
|
||||
* waiting for the fences. Used by the suballocator.
|
||||
* Returns 0 if any fence has passed, error for all other cases.
|
||||
*/
|
||||
int radeon_fence_wait_any(struct radeon_device *rdev,
|
||||
struct radeon_fence **fences,
|
||||
bool intr)
|
||||
|
@ -442,7 +575,16 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* caller must hold ring lock */
|
||||
/**
|
||||
* radeon_fence_wait_next_locked - wait for the next fence to signal
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Wait for the next fence on the requested ring to signal (all asics).
|
||||
* Returns 0 if the next fence has passed, error for all other cases.
|
||||
* Caller must hold ring lock.
|
||||
*/
|
||||
int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
uint64_t seq;
|
||||
|
@ -456,7 +598,16 @@ int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring)
|
|||
return radeon_fence_wait_seq(rdev, seq, ring, false, false);
|
||||
}
|
||||
|
||||
/* caller must hold ring lock */
|
||||
/**
|
||||
* radeon_fence_wait_empty_locked - wait for all fences to signal
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Wait for all fences on the requested ring to signal (all asics).
|
||||
* Returns 0 if the fences have passed, error for all other cases.
|
||||
* Caller must hold ring lock.
|
||||
*/
|
||||
void radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
uint64_t seq = rdev->fence_drv[ring].sync_seq[ring];
|
||||
|
@ -479,12 +630,27 @@ void radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring)
|
|||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_ref - take a ref on a fence
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
*
|
||||
* Take a reference on a fence (all asics).
|
||||
* Returns the fence.
|
||||
*/
|
||||
struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)
|
||||
{
|
||||
kref_get(&fence->kref);
|
||||
return fence;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_unref - remove a ref on a fence
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
*
|
||||
* Remove a reference on a fence (all asics).
|
||||
*/
|
||||
void radeon_fence_unref(struct radeon_fence **fence)
|
||||
{
|
||||
struct radeon_fence *tmp = *fence;
|
||||
|
@ -495,6 +661,16 @@ void radeon_fence_unref(struct radeon_fence **fence)
|
|||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_count_emitted - get the count of emitted fences
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @ring: ring index the fence is associated with
|
||||
*
|
||||
* Get the number of fences emitted on the requested ring (all asics).
|
||||
* Returns the number of emitted fences on the ring. Used by the
|
||||
* dynpm code to ring track activity.
|
||||
*/
|
||||
unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
uint64_t emitted;
|
||||
|
@ -512,6 +688,17 @@ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
|
|||
return (unsigned)emitted;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_need_sync - do we need a semaphore
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
* @dst_ring: which ring to check against
|
||||
*
|
||||
* Check if the fence needs to be synced against another ring
|
||||
* (all asics). If so, we need to emit a semaphore.
|
||||
* Returns true if we need to sync with another ring, false if
|
||||
* not.
|
||||
*/
|
||||
bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)
|
||||
{
|
||||
struct radeon_fence_driver *fdrv;
|
||||
|
@ -533,6 +720,15 @@ bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)
|
|||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_note_sync - record the sync point
|
||||
*
|
||||
* @fence: radeon fence object
|
||||
* @dst_ring: which ring to check against
|
||||
*
|
||||
* Note the sequence number at which point the fence will
|
||||
* be synced with the requested ring (all asics).
|
||||
*/
|
||||
void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)
|
||||
{
|
||||
struct radeon_fence_driver *dst, *src;
|
||||
|
@ -557,6 +753,18 @@ void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)
|
|||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_driver_start_ring - make the fence driver
|
||||
* ready for use on the requested ring.
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @ring: ring index to start the fence driver on
|
||||
*
|
||||
* Make the fence driver ready for processing (all asics).
|
||||
* Not all asics have all rings, so each asic will only
|
||||
* start the fence driver on the rings it has.
|
||||
* Returns 0 for success, errors for failure.
|
||||
*/
|
||||
int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
uint64_t index;
|
||||
|
@ -585,6 +793,16 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_driver_init_ring - init the fence driver
|
||||
* for the requested ring.
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
* @ring: ring index to start the fence driver on
|
||||
*
|
||||
* Init the fence driver for the requested ring (all asics).
|
||||
* Helper function for radeon_fence_driver_init().
|
||||
*/
|
||||
static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
|
||||
{
|
||||
int i;
|
||||
|
@ -599,6 +817,18 @@ static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
|
|||
rdev->fence_drv[ring].initialized = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_driver_init - init the fence driver
|
||||
* for all possible rings.
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
*
|
||||
* Init the fence driver for all possible rings (all asics).
|
||||
* Not all asics have all rings, so each asic will only
|
||||
* start the fence driver on the rings it has using
|
||||
* radeon_fence_driver_start_ring().
|
||||
* Returns 0 for success.
|
||||
*/
|
||||
int radeon_fence_driver_init(struct radeon_device *rdev)
|
||||
{
|
||||
int ring;
|
||||
|
@ -613,6 +843,14 @@ int radeon_fence_driver_init(struct radeon_device *rdev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* radeon_fence_driver_fini - tear down the fence driver
|
||||
* for all possible rings.
|
||||
*
|
||||
* @rdev: radeon device pointer
|
||||
*
|
||||
* Tear down the fence driver for all possible rings (all asics).
|
||||
*/
|
||||
void radeon_fence_driver_fini(struct radeon_device *rdev)
|
||||
{
|
||||
int ring;
|
||||
|
|
Loading…
Reference in a new issue