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drm/i915: Make intel_logical_ring_begin() static 

The only usage of intel_logical_ring_begin() is within intel_lrc.c so it can be
made static. To avoid a forward declaration at the top of the file, it and bunch
of other functions have been shuffled upwards.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Tomas Elf <tomas.elf@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
John Harrison 2015-03-19 12:30:07 +00:00 committed by Daniel Vetter
parent f3dc74c0e1
commit bc0dce3fd0
2 changed files with 237 additions and 240 deletions
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474
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -611,6 +611,243 @@ static int execlists_move_to_gpu(struct intel_ringbuffer *ringbuf,
return logical_ring_invalidate_all_caches(ringbuf, ctx);
}
static int logical_ring_alloc_request(struct intel_engine_cs *ring,
struct intel_context *ctx)
{
struct drm_i915_gem_request *request;
struct drm_i915_private *dev_private = ring->dev->dev_private;
int ret;
if (ring->outstanding_lazy_request)
return 0;
request = kzalloc(sizeof(*request), GFP_KERNEL);
if (request == NULL)
return -ENOMEM;
if (ctx != ring->default_context) {
ret = intel_lr_context_pin(ring, ctx);
if (ret) {
kfree(request);
return ret;
}
}
kref_init(&request->ref);
request->ring = ring;
request->uniq = dev_private->request_uniq++;
ret = i915_gem_get_seqno(ring->dev, &request->seqno);
if (ret) {
intel_lr_context_unpin(ring, ctx);
kfree(request);
return ret;
}
request->ctx = ctx;
i915_gem_context_reference(request->ctx);
request->ringbuf = ctx->engine[ring->id].ringbuf;
ring->outstanding_lazy_request = request;
return 0;
}
static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf,
int bytes)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_i915_gem_request *request;
int ret;
if (intel_ring_space(ringbuf) >= bytes)
return 0;
list_for_each_entry(request, &ring->request_list, list) {
/*
* The request queue is per-engine, so can contain requests
* from multiple ringbuffers. Here, we must ignore any that
* aren't from the ringbuffer we're considering.
*/
struct intel_context *ctx = request->ctx;
if (ctx->engine[ring->id].ringbuf != ringbuf)
continue;
/* Would completion of this request free enough space? */
if (__intel_ring_space(request->tail, ringbuf->tail,
ringbuf->size) >= bytes) {
break;
}
}
if (&request->list == &ring->request_list)
return -ENOSPC;
ret = i915_wait_request(request);
if (ret)
return ret;
i915_gem_retire_requests_ring(ring);
return intel_ring_space(ringbuf) >= bytes ? 0 : -ENOSPC;
}
/*
* intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
* @ringbuf: Logical Ringbuffer to advance.
*
* The tail is updated in our logical ringbuffer struct, not in the actual context. What
* really happens during submission is that the context and current tail will be placed
* on a queue waiting for the ELSP to be ready to accept a new context submission. At that
* point, the tail *inside* the context is updated and the ELSP written to.
*/
static void
intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx,
struct drm_i915_gem_request *request)
{
struct intel_engine_cs *ring = ringbuf->ring;
intel_logical_ring_advance(ringbuf);
if (intel_ring_stopped(ring))
return;
execlists_context_queue(ring, ctx, ringbuf->tail, request);
}
static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx,
int bytes)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_device *dev = ring->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned long end;
int ret;
ret = logical_ring_wait_request(ringbuf, bytes);
if (ret != -ENOSPC)
return ret;
/* Force the context submission in case we have been skipping it */
intel_logical_ring_advance_and_submit(ringbuf, ctx, NULL);
/* With GEM the hangcheck timer should kick us out of the loop,
* leaving it early runs the risk of corrupting GEM state (due
* to running on almost untested codepaths). But on resume
* timers don't work yet, so prevent a complete hang in that
* case by choosing an insanely large timeout. */
end = jiffies + 60 * HZ;
ret = 0;
do {
if (intel_ring_space(ringbuf) >= bytes)
break;
msleep(1);
if (dev_priv->mm.interruptible && signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
ret = i915_gem_check_wedge(&dev_priv->gpu_error,
dev_priv->mm.interruptible);
if (ret)
break;
if (time_after(jiffies, end)) {
ret = -EBUSY;
break;
}
} while (1);
return ret;
}
static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx)
{
uint32_t __iomem *virt;
int rem = ringbuf->size - ringbuf->tail;
if (ringbuf->space < rem) {
int ret = logical_ring_wait_for_space(ringbuf, ctx, rem);
if (ret)
return ret;
}
virt = ringbuf->virtual_start + ringbuf->tail;
rem /= 4;
while (rem--)
iowrite32(MI_NOOP, virt++);
ringbuf->tail = 0;
intel_ring_update_space(ringbuf);
return 0;
}
static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx, int bytes)
{
int ret;
if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {
ret = logical_ring_wrap_buffer(ringbuf, ctx);
if (unlikely(ret))
return ret;
}
if (unlikely(ringbuf->space < bytes)) {
ret = logical_ring_wait_for_space(ringbuf, ctx, bytes);
if (unlikely(ret))
return ret;
}
return 0;
}
/**
* intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
*
* @ringbuf: Logical ringbuffer.
* @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
*
* The ringbuffer might not be ready to accept the commands right away (maybe it needs to
* be wrapped, or wait a bit for the tail to be updated). This function takes care of that
* and also preallocates a request (every workload submission is still mediated through
* requests, same as it did with legacy ringbuffer submission).
*
* Return: non-zero if the ringbuffer is not ready to be written to.
*/
static int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx, int num_dwords)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_device *dev = ring->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
ret = i915_gem_check_wedge(&dev_priv->gpu_error,
dev_priv->mm.interruptible);
if (ret)
return ret;
ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t));
if (ret)
return ret;
/* Preallocate the olr before touching the ring */
ret = logical_ring_alloc_request(ring, ctx);
if (ret)
return ret;
ringbuf->space -= num_dwords * sizeof(uint32_t);
return 0;
}
/**
* execlists_submission() - submit a batchbuffer for execution, Execlists style
* @dev: DRM device.
@ -787,30 +1024,6 @@ int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf,
return 0;
}
/*
* intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
* @ringbuf: Logical Ringbuffer to advance.
*
* The tail is updated in our logical ringbuffer struct, not in the actual context. What
* really happens during submission is that the context and current tail will be placed
* on a queue waiting for the ELSP to be ready to accept a new context submission. At that
* point, the tail *inside* the context is updated and the ELSP written to.
*/
static void
intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx,
struct drm_i915_gem_request *request)
{
struct intel_engine_cs *ring = ringbuf->ring;
intel_logical_ring_advance(ringbuf);
if (intel_ring_stopped(ring))
return;
execlists_context_queue(ring, ctx, ringbuf->tail, request);
}
static int intel_lr_context_pin(struct intel_engine_cs *ring,
struct intel_context *ctx)
{
@ -855,219 +1068,6 @@ void intel_lr_context_unpin(struct intel_engine_cs *ring,
}
}
static int logical_ring_alloc_request(struct intel_engine_cs *ring,
struct intel_context *ctx)
{
struct drm_i915_gem_request *request;
struct drm_i915_private *dev_private = ring->dev->dev_private;
int ret;
if (ring->outstanding_lazy_request)
return 0;
request = kzalloc(sizeof(*request), GFP_KERNEL);
if (request == NULL)
return -ENOMEM;
if (ctx != ring->default_context) {
ret = intel_lr_context_pin(ring, ctx);
if (ret) {
kfree(request);
return ret;
}
}
kref_init(&request->ref);
request->ring = ring;
request->uniq = dev_private->request_uniq++;
ret = i915_gem_get_seqno(ring->dev, &request->seqno);
if (ret) {
intel_lr_context_unpin(ring, ctx);
kfree(request);
return ret;
}
request->ctx = ctx;
i915_gem_context_reference(request->ctx);
request->ringbuf = ctx->engine[ring->id].ringbuf;
ring->outstanding_lazy_request = request;
return 0;
}
static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf,
int bytes)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_i915_gem_request *request;
int ret;
if (intel_ring_space(ringbuf) >= bytes)
return 0;
list_for_each_entry(request, &ring->request_list, list) {
/*
* The request queue is per-engine, so can contain requests
* from multiple ringbuffers. Here, we must ignore any that
* aren't from the ringbuffer we're considering.
*/
struct intel_context *ctx = request->ctx;
if (ctx->engine[ring->id].ringbuf != ringbuf)
continue;
/* Would completion of this request free enough space? */
if (__intel_ring_space(request->tail, ringbuf->tail,
ringbuf->size) >= bytes) {
break;
}
}
if (&request->list == &ring->request_list)
return -ENOSPC;
ret = i915_wait_request(request);
if (ret)
return ret;
i915_gem_retire_requests_ring(ring);
return intel_ring_space(ringbuf) >= bytes ? 0 : -ENOSPC;
}
static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx,
int bytes)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_device *dev = ring->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned long end;
int ret;
ret = logical_ring_wait_request(ringbuf, bytes);
if (ret != -ENOSPC)
return ret;
/* Force the context submission in case we have been skipping it */
intel_logical_ring_advance_and_submit(ringbuf, ctx, NULL);
/* With GEM the hangcheck timer should kick us out of the loop,
* leaving it early runs the risk of corrupting GEM state (due
* to running on almost untested codepaths). But on resume
* timers don't work yet, so prevent a complete hang in that
* case by choosing an insanely large timeout. */
end = jiffies + 60 * HZ;
ret = 0;
do {
if (intel_ring_space(ringbuf) >= bytes)
break;
msleep(1);
if (dev_priv->mm.interruptible && signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
ret = i915_gem_check_wedge(&dev_priv->gpu_error,
dev_priv->mm.interruptible);
if (ret)
break;
if (time_after(jiffies, end)) {
ret = -EBUSY;
break;
}
} while (1);
return ret;
}
static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx)
{
uint32_t __iomem *virt;
int rem = ringbuf->size - ringbuf->tail;
if (ringbuf->space < rem) {
int ret = logical_ring_wait_for_space(ringbuf, ctx, rem);
if (ret)
return ret;
}
virt = ringbuf->virtual_start + ringbuf->tail;
rem /= 4;
while (rem--)
iowrite32(MI_NOOP, virt++);
ringbuf->tail = 0;
intel_ring_update_space(ringbuf);
return 0;
}
static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx, int bytes)
{
int ret;
if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {
ret = logical_ring_wrap_buffer(ringbuf, ctx);
if (unlikely(ret))
return ret;
}
if (unlikely(ringbuf->space < bytes)) {
ret = logical_ring_wait_for_space(ringbuf, ctx, bytes);
if (unlikely(ret))
return ret;
}
return 0;
}
/**
* intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
*
* @ringbuf: Logical ringbuffer.
* @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
*
* The ringbuffer might not be ready to accept the commands right away (maybe it needs to
* be wrapped, or wait a bit for the tail to be updated). This function takes care of that
* and also preallocates a request (every workload submission is still mediated through
* requests, same as it did with legacy ringbuffer submission).
*
* Return: non-zero if the ringbuffer is not ready to be written to.
*/
int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx, int num_dwords)
{
struct intel_engine_cs *ring = ringbuf->ring;
struct drm_device *dev = ring->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
ret = i915_gem_check_wedge(&dev_priv->gpu_error,
dev_priv->mm.interruptible);
if (ret)
return ret;
ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t));
if (ret)
return ret;
/* Preallocate the olr before touching the ring */
ret = logical_ring_alloc_request(ring, ctx);
if (ret)
return ret;
ringbuf->space -= num_dwords * sizeof(uint32_t);
return 0;
}
static int intel_logical_ring_workarounds_emit(struct intel_engine_cs *ring,
struct intel_context *ctx)
{

3
drivers/gpu/drm/i915/intel_lrc.h
View File

@ -63,9 +63,6 @@ static inline void intel_logical_ring_emit(struct intel_ringbuffer *ringbuf,
iowrite32(data, ringbuf->virtual_start + ringbuf->tail);
ringbuf->tail += 4;
}
int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
struct intel_context *ctx,
int num_dwords);
/* Logical Ring Contexts */
void intel_lr_context_free(struct intel_context *ctx);