mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/i915/gvt: Introduce per object locking in GVT scheduler. 

To support ww locking and per-object implemented in i915, GVT scheduler needs
to be refined. Most of the changes are located in shadow batch buffer, shadow
wa context in GVT-g, where use quite a lot of i915 gem object APIs.

v2:

- Adjust the usage of ww lock on context pin/unpin. (maarten)
- Rebase the patch on the newest staging branch.

Fixes: 6b05030496 ("drm/i915: Convert i915_gem_object/client_blt.c to use ww locking as well, v2.")
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1610314985-26065-1-git-send-email-zhi.wang.linux@gmail.com
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Zhi Wang 2021-01-10 23:43:05 +02:00 committed by Zhenyu Wang
parent d18ac1a7ee
commit 67f1120381
1 changed files with 40 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/gpu/drm/i915/gvt/scheduler.c
View File

@ -412,7 +412,9 @@ static void release_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
if (!wa_ctx->indirect_ctx.obj)
return;
i915_gem_object_lock(wa_ctx->indirect_ctx.obj, NULL);
i915_gem_object_unpin_map(wa_ctx->indirect_ctx.obj);
i915_gem_object_unlock(wa_ctx->indirect_ctx.obj);
i915_gem_object_put(wa_ctx->indirect_ctx.obj);
wa_ctx->indirect_ctx.obj = NULL;
@ -520,6 +522,7 @@ static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload)
struct intel_gvt *gvt = workload->vgpu->gvt;
const int gmadr_bytes = gvt->device_info.gmadr_bytes_in_cmd;
struct intel_vgpu_shadow_bb *bb;
struct i915_gem_ww_ctx ww;
int ret;
list_for_each_entry(bb, &workload->shadow_bb, list) {
@ -544,10 +547,19 @@ static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload)
* directly
*/
if (!bb->ppgtt) {
bb->vma = i915_gem_object_ggtt_pin(bb->obj,
NULL, 0, 0, 0);
i915_gem_ww_ctx_init(&ww, false);
retry:
i915_gem_object_lock(bb->obj, &ww);
bb->vma = i915_gem_object_ggtt_pin_ww(bb->obj, &ww,
NULL, 0, 0, 0);
if (IS_ERR(bb->vma)) {
ret = PTR_ERR(bb->vma);
if (ret == -EDEADLK) {
ret = i915_gem_ww_ctx_backoff(&ww);
if (!ret)
goto retry;
}
goto err;
}
@ -561,13 +573,15 @@ static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload)
0);
if (ret)
goto err;
}
/* No one is going to touch shadow bb from now on. */
i915_gem_object_flush_map(bb->obj);
/* No one is going to touch shadow bb from now on. */
i915_gem_object_flush_map(bb->obj);
i915_gem_object_unlock(bb->obj);
}
}
return 0;
err:
i915_gem_ww_ctx_fini(&ww);
release_shadow_batch_buffer(workload);
return ret;
}
@ -594,14 +608,29 @@ static int prepare_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
unsigned char *per_ctx_va =
(unsigned char *)wa_ctx->indirect_ctx.shadow_va +
wa_ctx->indirect_ctx.size;
struct i915_gem_ww_ctx ww;
int ret;
if (wa_ctx->indirect_ctx.size == 0)
return 0;
vma = i915_gem_object_ggtt_pin(wa_ctx->indirect_ctx.obj, NULL,
0, CACHELINE_BYTES, 0);
if (IS_ERR(vma))
return PTR_ERR(vma);
i915_gem_ww_ctx_init(&ww, false);
retry:
i915_gem_object_lock(wa_ctx->indirect_ctx.obj, &ww);
vma = i915_gem_object_ggtt_pin_ww(wa_ctx->indirect_ctx.obj, &ww, NULL,
0, CACHELINE_BYTES, 0);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
if (ret == -EDEADLK) {
ret = i915_gem_ww_ctx_backoff(&ww);
if (!ret)
goto retry;
}
return ret;
}
i915_gem_object_unlock(wa_ctx->indirect_ctx.obj);
/* FIXME: we are not tracking our pinned VMA leaving it
* up to the core to fix up the stray pin_count upon
@ -635,12 +664,14 @@ static void release_shadow_batch_buffer(struct intel_vgpu_workload *workload)
list_for_each_entry_safe(bb, pos, &workload->shadow_bb, list) {
if (bb->obj) {
i915_gem_object_lock(bb->obj, NULL);
if (bb->va && !IS_ERR(bb->va))
i915_gem_object_unpin_map(bb->obj);
if (bb->vma && !IS_ERR(bb->vma))
i915_vma_unpin(bb->vma);
i915_gem_object_unlock(bb->obj);
i915_gem_object_put(bb->obj);
}
list_del(&bb->list);