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