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gpu: nvgpu: update device management framework to remove unusable engines

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On certain platforms, not all copy engine instances are usable. The user
shouldn't submit any work to these engines. To enforce this, remove
these engines from active/host_engine list, this should ensure that these
engines do not get advertised to userspace. In order to accomplish this
introduce the following functions:
- nvgpu_engine_remove_one_dev: This function removes the specified device
  entry from following device lists: fifo->host_engines, fifo->active_engines,
  runlist->rl_dev_list, runlist->eng_bitmask.

Replace iteration over LCE device type entries using
nvgpu_device_for_each(g, dev, NVGPU_DEVTYPE_LCE), along with this introduce
macro nvgpu_device_for_each_safe.

Introduce gpu_dbg_ce flag for CE debugging.

Bug 3370462

Change-Id: I2e21f18363c6e53630d129da241c8fece106cd33
Signed-off-by: Antony Clince Alex <aalex@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2616711
Reviewed-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Antony Clince Alex
2021-10-26 10:09:20 +00:00
committed by mobile promotions
parent 79ee724b04
commit cce1d7ad84
7 changed files with 82 additions and 32 deletions
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10
drivers/gpu/nvgpu/common/ce/ce.c
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@@ -37,6 +37,16 @@ int nvgpu_ce_init_support(struct gk20a *g)
g->ops.ce.set_pce2lce_mapping(g);
}
/*
* Bug 1895019
* Each time PCE2LCE config is updated and if it happens to
* map a LCE which was previously unmapped, then ELCG would have turned
* off the clock to the unmapped LCE and when the LCE config is updated,
* a race occurs between the config update and ELCG turning on the clock
* to that LCE, this might result in LCE dropping the config update.
* To avoid such a race, each time PCE2LCE config is updated toggle
* resets for all LCEs.
*/
err = nvgpu_mc_reset_devtype(g, NVGPU_DEVTYPE_LCE);
if (err != 0) {
nvgpu_err(g, "NVGPU_DEVTYPE_LCE reset failed");