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gpu: nvgpu: prealloc priv cmdbuf metadata

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Move preallocation of priv cmdbuf metadata structs to the priv cmdbuf
level and do it always, not only on deterministic channels. This makes
job tracking simpler and loosens dependencies from jobs to cmdbuf
internals. The underlying dma memory for the cmdbuf data has always been
preallocated.

Rename the priv cmdbuf functions to have a consistent prefix.

Refactor the channel sync wait and incr ops to free any priv cmdbufs
they allocate. They have been depending on the caller to free their
resources even on error conditions, requiring the caller to know how
they work.

The error paths that could occur after a priv cmdbuf has been allocated
have likely been wrong for a long time. Usually the cmdbuf queue allows
allocating only from one end and freeing from only the other end, as
that's natural with the hardware job queue. However, in error conditions
the just recently allocated entries need to be put back. Improve the
interface for this.

[not part of the cherry-pick:] Delete the error prints about not enough
priv cmd buffer space. That is not an error. When obeying the
user-provided job sizes more strictly, momentarily running out of job
tracking resources is possible when the job cleanup thread does not
catch up quickly enough. In such a case the number of inflight jobs on
the hardware could be less than the maximum, but the inflight job count
that nvgpu sees via the consumed resources could reach the maximum.
Also remove the wrong translation to -EINVAL from err from one call to
nvgpu_priv_cmdbuf_alloc() - the -EAGAIN from the failed allocation is
important.

[not part of the cherry-pick: a bunch of MISRA mitigations.]

Jira NVGPU-4548

Change-Id: I09d02bd44d50a5451500d09605f906d74009a8a4
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2329657
(cherry picked from commit 25412412f31436688c6b45684886f7552075da83)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2332506
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Hölttä
2020-04-06 13:44:54 +03:00
committed by Alex Waterman
parent bc4f74d854
commit 9bee2fe660
11 changed files with 190 additions and 192 deletions
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8
drivers/gpu/nvgpu/common/sync/channel_sync.c
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@@ -58,21 +58,21 @@ bool nvgpu_channel_sync_needs_os_fence_framework(struct gk20a *g)
}
int nvgpu_channel_sync_wait_fence_fd(struct nvgpu_channel_sync *s, int fd,
struct priv_cmd_entry *entry, u32 max_wait_cmds)
struct priv_cmd_entry **entry, u32 max_wait_cmds)
{
return s->ops->wait_fence_fd(s, fd, entry, max_wait_cmds);
}
int nvgpu_channel_sync_incr(struct nvgpu_channel_sync *s,
struct priv_cmd_entry *entry, struct nvgpu_fence_type *fence,
struct priv_cmd_entry **entry, struct nvgpu_fence_type *fence,
bool need_sync_fence, bool register_irq)
{
return s->ops->incr(s, entry, fence, need_sync_fence, register_irq);
}
int nvgpu_channel_sync_incr_user(struct nvgpu_channel_sync *s,
struct priv_cmd_entry *entry, struct nvgpu_fence_type *fence, bool wfi,
bool need_sync_fence, bool register_irq)
struct priv_cmd_entry **entry, struct nvgpu_fence_type *fence,
bool wfi, bool need_sync_fence, bool register_irq)
{
return s->ops->incr_user(s, entry, fence, wfi, need_sync_fence,
register_irq);