[PATCH 10/16] drm/radeon: document radeon_ring.c (v4)
alexdeucher at gmail.com
alexdeucher at gmail.com
Tue Jul 17 11:02:38 PDT 2012
From: Alex Deucher <alexander.deucher at amd.com>
Adds documentation to most of the functions in
radeon_ring.c
v2: adjust per Christian's suggestions
v3: adjust per Christian's latest patches
v4: adjust per my latest changes
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
drivers/gpu/drm/radeon/radeon_ring.c | 208 +++++++++++++++++++++++++++++++++-
1 files changed, 205 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index c1efde6..f2fc25d 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -35,10 +35,28 @@
#include "atom.h"
/*
- * IB.
+ * IB
+ * IBs (Indirect Buffers) and areas of GPU accessible memory where
+ * commands are stored. You can put a pointer to the IB in the
+ * command ring and the hw will fetch the commands from the IB
+ * and execute them. Generally userspace acceleration drivers
+ * produce command buffers which are send to the kernel and
+ * put in IBs for execution by the requested ring.
*/
int radeon_debugfs_sa_init(struct radeon_device *rdev);
+/**
+ * radeon_ib_get - request an IB (Indirect Buffer)
+ *
+ * @rdev: radeon_device pointer
+ * @ring: ring index the IB is associated with
+ * @ib: IB object returned
+ * @size: requested IB size
+ *
+ * Request an IB (all asics). IBs are allocated using the
+ * suballocator.
+ * Returns 0 on success, error on failure.
+ */
int radeon_ib_get(struct radeon_device *rdev, int ring,
struct radeon_ib *ib, unsigned size)
{
@@ -67,6 +85,14 @@ int radeon_ib_get(struct radeon_device *rdev, int ring,
return 0;
}
+/**
+ * radeon_ib_free - free an IB (Indirect Buffer)
+ *
+ * @rdev: radeon_device pointer
+ * @ib: IB object to free
+ *
+ * Free an IB (all asics).
+ */
void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib *ib)
{
radeon_semaphore_free(rdev, &ib->semaphore, ib->fence);
@@ -74,6 +100,26 @@ void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib *ib)
radeon_fence_unref(&ib->fence);
}
+/**
+ * radeon_ib_schedule - schedule an IB (Indirect Buffer) on the ring
+ *
+ * @rdev: radeon_device pointer
+ * @ib: IB object to schedule
+ * @const_ib: Const IB to schedule (SI only)
+ *
+ * Schedule an IB on the associated ring (all asics).
+ * Returns 0 on success, error on failure.
+ *
+ * On SI, there are two parallel engines fed from the primary ring,
+ * the CE (Constant Engine) and the DE (Drawing Engine). Since
+ * resource descriptors have moved to memory, the CE allows you to
+ * prime the caches while the DE is updating register state so that
+ * the resource descriptors will be already in cache when the draw is
+ * processed. To accomplish this, the userspace driver submits two
+ * IBs, one for the CE and one for the DE. If there is a CE IB (called
+ * a CONST_IB), it will be put on the ring prior to the DE IB. Prior
+ * to SI there was just a DE IB.
+ */
int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib,
struct radeon_ib *const_ib)
{
@@ -124,6 +170,15 @@ int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib,
return 0;
}
+/**
+ * radeon_ib_pool_init - Init the IB (Indirect Buffer) pool
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Initialize the suballocator to manage a pool of memory
+ * for use as IBs (all asics).
+ * Returns 0 on success, error on failure.
+ */
int radeon_ib_pool_init(struct radeon_device *rdev)
{
int r;
@@ -150,6 +205,14 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
return 0;
}
+/**
+ * radeon_ib_pool_fini - Free the IB (Indirect Buffer) pool
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Tear down the suballocator managing the pool of memory
+ * for use as IBs (all asics).
+ */
void radeon_ib_pool_fini(struct radeon_device *rdev)
{
if (rdev->ib_pool_ready) {
@@ -159,6 +222,16 @@ void radeon_ib_pool_fini(struct radeon_device *rdev)
}
}
+/**
+ * radeon_ib_ring_tests - test IBs on the rings
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Test an IB (Indirect Buffer) on each ring.
+ * If the test fails, disable the ring.
+ * Returns 0 on success, error if the primary GFX ring
+ * IB test fails.
+ */
int radeon_ib_ring_tests(struct radeon_device *rdev)
{
unsigned i;
@@ -190,10 +263,28 @@ int radeon_ib_ring_tests(struct radeon_device *rdev)
}
/*
- * Ring.
+ * Rings
+ * Most engines on the GPU are fed via ring buffers. Ring
+ * buffers are areas of GPU accessible memory that the host
+ * writes commands into and the GPU reads commands out of.
+ * There is a rptr (read pointer) that determines where the
+ * GPU is currently reading, and a wptr (write pointer)
+ * which determines where the host has written. When the
+ * pointers are equal, the ring is idle. When the host
+ * writes commands to the ring buffer, it increments the
+ * wptr. The GPU then starts fetching commands and executes
+ * them until the pointers are equal again.
*/
int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring);
+/**
+ * radeon_ring_write - write a value to the ring
+ *
+ * @ring: radeon_ring structure holding ring information
+ * @v: dword (dw) value to write
+ *
+ * Write a value to the requested ring buffer (all asics).
+ */
void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
{
#if DRM_DEBUG_CODE
@@ -207,6 +298,16 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
ring->ring_free_dw--;
}
+/**
+ * radeon_ring_supports_scratch_reg - check if the ring supports
+ * writing to scratch registers
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Check if a specific ring supports writing to scratch registers (all asics).
+ * Returns true if the ring supports writing to scratch regs, false if not.
+ */
bool radeon_ring_supports_scratch_reg(struct radeon_device *rdev,
struct radeon_ring *ring)
{
@@ -220,6 +321,14 @@ bool radeon_ring_supports_scratch_reg(struct radeon_device *rdev,
}
}
+/**
+ * radeon_ring_free_size - update the free size
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Update the free dw slots in the ring buffer (all asics).
+ */
void radeon_ring_free_size(struct radeon_device *rdev, struct radeon_ring *ring)
{
u32 rptr;
@@ -238,7 +347,16 @@ void radeon_ring_free_size(struct radeon_device *rdev, struct radeon_ring *ring)
}
}
-
+/**
+ * radeon_ring_alloc - allocate space on the ring buffer
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ * @ndw: number of dwords to allocate in the ring buffer
+ *
+ * Allocate @ndw dwords in the ring buffer (all asics).
+ * Returns 0 on success, error on failure.
+ */
int radeon_ring_alloc(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
{
int r;
@@ -260,6 +378,17 @@ int radeon_ring_alloc(struct radeon_device *rdev, struct radeon_ring *ring, unsi
return 0;
}
+/**
+ * radeon_ring_lock - lock the ring and allocate space on it
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ * @ndw: number of dwords to allocate in the ring buffer
+ *
+ * Lock the ring and allocate @ndw dwords in the ring buffer
+ * (all asics).
+ * Returns 0 on success, error on failure.
+ */
int radeon_ring_lock(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
{
int r;
@@ -273,6 +402,16 @@ int radeon_ring_lock(struct radeon_device *rdev, struct radeon_ring *ring, unsig
return 0;
}
+/**
+ * radeon_ring_commit - tell the GPU to execute the new
+ * commands on the ring buffer
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Update the wptr (write pointer) to tell the GPU to
+ * execute new commands on the ring buffer (all asics).
+ */
void radeon_ring_commit(struct radeon_device *rdev, struct radeon_ring *ring)
{
/* We pad to match fetch size */
@@ -284,23 +423,55 @@ void radeon_ring_commit(struct radeon_device *rdev, struct radeon_ring *ring)
(void)RREG32(ring->wptr_reg);
}
+/**
+ * radeon_ring_unlock_commit - tell the GPU to execute the new
+ * commands on the ring buffer and unlock it
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Call radeon_ring_commit() then unlock the ring (all asics).
+ */
void radeon_ring_unlock_commit(struct radeon_device *rdev, struct radeon_ring *ring)
{
radeon_ring_commit(rdev, ring);
mutex_unlock(&rdev->ring_lock);
}
+/**
+ * radeon_ring_undo - reset the wptr
+ *
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Reset the driver's copy of the wtpr (all asics).
+ */
void radeon_ring_undo(struct radeon_ring *ring)
{
ring->wptr = ring->wptr_old;
}
+/**
+ * radeon_ring_unlock_undo - reset the wptr and unlock the ring
+ *
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Call radeon_ring_undo() then unlock the ring (all asics).
+ */
void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *ring)
{
radeon_ring_undo(ring);
mutex_unlock(&rdev->ring_lock);
}
+/**
+ * radeon_ring_force_activity - add some nop packets to the ring
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Add some nop packets to the ring to force activity (all asics).
+ * Used for lockup detection to see if the rptr is advancing.
+ */
void radeon_ring_force_activity(struct radeon_device *rdev, struct radeon_ring *ring)
{
int r;
@@ -315,6 +486,13 @@ void radeon_ring_force_activity(struct radeon_device *rdev, struct radeon_ring *
}
}
+/**
+ * radeon_ring_force_activity - update lockup variables
+ *
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Update the last rptr value and timestamp (all asics).
+ */
void radeon_ring_lockup_update(struct radeon_ring *ring)
{
ring->last_rptr = ring->rptr;
@@ -458,6 +636,22 @@ int radeon_ring_restore(struct radeon_device *rdev, struct radeon_ring *ring,
return 0;
}
+/**
+ * radeon_ring_init - init driver ring struct.
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ * @ring_size: size of the ring
+ * @rptr_offs: offset of the rptr writeback location in the WB buffer
+ * @rptr_reg: MMIO offset of the rptr register
+ * @wptr_reg: MMIO offset of the wptr register
+ * @ptr_reg_shift: bit offset of the rptr/wptr values
+ * @ptr_reg_mask: bit mask of the rptr/wptr values
+ * @nop: nop packet for this ring
+ *
+ * Initialize the driver information for the selected ring (all asics).
+ * Returns 0 on success, error on failure.
+ */
int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ring_size,
unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg,
u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop)
@@ -511,6 +705,14 @@ int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsig
return 0;
}
+/**
+ * radeon_ring_fini - tear down the driver ring struct.
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Tear down the driver information for the selected ring (all asics).
+ */
void radeon_ring_fini(struct radeon_device *rdev, struct radeon_ring *ring)
{
int r;
--
1.7.7.5
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