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gpu: nvgpu: hide priv cmdbuf mem writes

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Add an API to append data to a priv cmdbuf entry. Hold the write pointer
offset internally in the entry instead of having the user keep track of
where those words are written to.

This helps in eventually hiding struct priv_cmd_entry from users and
provides a more consistent interface in general. The wait and incr
commands are now slightly easier to read as well when they're just
arrays of data.

A syncfd-backed prefence may be composed of several individual fences.
Some of those (or even a fence backed by just one) may be already
expired, and currently the syncfd export design releases and nulls
semaphores when expired (see gk20a_sync_pt_has_signaled()) so for those
the wait cmdbuf is appended with zeros; the specific function is for
this purpose.

Jira NVGPU-4548

Change-Id: I1057f98c1b5b407460aa6e1dcba917da9c9aa9c9
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2325099
(cherry picked from commit 6a00a65a86d8249cfeb06a05682abb4771949f19)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2331336
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@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
2020-04-03 11:04:02 +03:00
committed by Alex Waterman
parent 0c9f589f3f
commit 39844fb27c
13 changed files with 217 additions and 200 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/nvgpu/hal/sync/syncpt_cmdbuf_gk20a.h
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@@ -32,7 +32,7 @@ struct nvgpu_mem;
#ifdef CONFIG_NVGPU_KERNEL_MODE_SUBMIT
void gk20a_syncpt_add_wait_cmd(struct gk20a *g,
struct priv_cmd_entry *cmd, u32 off,
struct priv_cmd_entry *cmd,
u32 id, u32 thresh, u64 gpu_va_base);
u32 gk20a_syncpt_get_wait_cmd_size(void);
u32 gk20a_syncpt_get_incr_per_release(void);
@@ -52,7 +52,7 @@ int gk20a_syncpt_alloc_buf(struct nvgpu_channel *c,
#ifdef CONFIG_NVGPU_KERNEL_MODE_SUBMIT
static inline void gk20a_syncpt_add_wait_cmd(struct gk20a *g,
struct priv_cmd_entry *cmd, u32 off,
struct priv_cmd_entry *cmd,
u32 id, u32 thresh, u64 gpu_va_base)
{
}