[i-g-t,1/2] lib/i915: Add helper for copying engine maps from one context to another
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Message ID 20200124121759.22308-1-tvrtko.ursulin@linux.intel.com
State New
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Series
  • [i-g-t,1/2] lib/i915: Add helper for copying engine maps from one context to another
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Commit Message

Tvrtko Ursulin Jan. 24, 2020, 12:17 p.m. UTC
From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

We also need to support copying across file descriptors.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sreedhar Telukuntla <sreedhar.telukuntla@intel.com>
---
 lib/i915/gem_context.c | 30 ++++++++++++++++++++++++++++++
 lib/i915/gem_context.h |  2 ++
 2 files changed, 32 insertions(+)

Comments

Chris Wilson Jan. 24, 2020, 12:23 p.m. UTC | #1
Quoting Tvrtko Ursulin (2020-01-24 12:17:58)
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> We also need to support copying across file descriptors.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Sreedhar Telukuntla <sreedhar.telukuntla@intel.com>
> ---
>  lib/i915/gem_context.c | 30 ++++++++++++++++++++++++++++++
>  lib/i915/gem_context.h |  2 ++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
> index 0b6a554dfe27..41957b66ca52 100644
> --- a/lib/i915/gem_context.c
> +++ b/lib/i915/gem_context.c
> @@ -462,3 +462,33 @@ bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
>  
>         return __gem_execbuf(fd, &execbuf) == -ENOENT;
>  }
> +
> +/**
> + * gem_context_copy_engines:
> + * @src_fd: open i915 drm file descriptor where @src context belongs to
> + * @src: source engine map context id
> + * @dst_fd: open i915 drm file descriptor where @dst context belongs to
> + * @dst: destination engine map context id
> + *
> + * Special purpose wrapper for copying engine map from one context to another.
> + *
> + * In can be called regardless of whether the kernel supports context engine
> + * maps and is a no-op if not supported.
> + */
> +void
> +gem_context_copy_engines(int src_fd, uint32_t src, int dst_fd, uint32_t dst)
> +{
> +       I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, I915_EXEC_RING_MASK + 1);
> +       struct drm_i915_gem_context_param param = {
> +               .param = I915_CONTEXT_PARAM_ENGINES,
> +               .ctx_id = src,
> +               .size = sizeof(engines),
> +               .value = to_user_pointer(&engines),
> +       };
> +
> +       if (__gem_context_get_param(src_fd, &param) || !param.size)
> +               return;
> +
> +       param.ctx_id = dst;
> +       gem_context_set_param(dst_fd, &param);

You don't want to copy across the use-default set? You presume dst is
already using defaults?
-Chris
Tvrtko Ursulin Jan. 24, 2020, 12:26 p.m. UTC | #2
On 24/01/2020 12:23, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2020-01-24 12:17:58)
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> We also need to support copying across file descriptors.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Cc: Sreedhar Telukuntla <sreedhar.telukuntla@intel.com>
>> ---
>>   lib/i915/gem_context.c | 30 ++++++++++++++++++++++++++++++
>>   lib/i915/gem_context.h |  2 ++
>>   2 files changed, 32 insertions(+)
>>
>> diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
>> index 0b6a554dfe27..41957b66ca52 100644
>> --- a/lib/i915/gem_context.c
>> +++ b/lib/i915/gem_context.c
>> @@ -462,3 +462,33 @@ bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
>>   
>>          return __gem_execbuf(fd, &execbuf) == -ENOENT;
>>   }
>> +
>> +/**
>> + * gem_context_copy_engines:
>> + * @src_fd: open i915 drm file descriptor where @src context belongs to
>> + * @src: source engine map context id
>> + * @dst_fd: open i915 drm file descriptor where @dst context belongs to
>> + * @dst: destination engine map context id
>> + *
>> + * Special purpose wrapper for copying engine map from one context to another.
>> + *
>> + * In can be called regardless of whether the kernel supports context engine
>> + * maps and is a no-op if not supported.
>> + */
>> +void
>> +gem_context_copy_engines(int src_fd, uint32_t src, int dst_fd, uint32_t dst)
>> +{
>> +       I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, I915_EXEC_RING_MASK + 1);
>> +       struct drm_i915_gem_context_param param = {
>> +               .param = I915_CONTEXT_PARAM_ENGINES,
>> +               .ctx_id = src,
>> +               .size = sizeof(engines),
>> +               .value = to_user_pointer(&engines),
>> +       };
>> +
>> +       if (__gem_context_get_param(src_fd, &param) || !param.size)
>> +               return;
>> +
>> +       param.ctx_id = dst;
>> +       gem_context_set_param(dst_fd, &param);
> 
> You don't want to copy across the use-default set? You presume dst is
> already using defaults?

Hm hm.. not sure. I guess it would be most in-line with what the helper 
say on the tin to copy as is. I'll respin.

Regards,

Tvrtko
Chris Wilson Jan. 24, 2020, 12:29 p.m. UTC | #3
Quoting Tvrtko Ursulin (2020-01-24 12:26:31)
> 
> On 24/01/2020 12:23, Chris Wilson wrote:
> > Quoting Tvrtko Ursulin (2020-01-24 12:17:58)
> >> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> >>
> >> We also need to support copying across file descriptors.
> >>
> >> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> >> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> >> Cc: Sreedhar Telukuntla <sreedhar.telukuntla@intel.com>
> >> ---
> >>   lib/i915/gem_context.c | 30 ++++++++++++++++++++++++++++++
> >>   lib/i915/gem_context.h |  2 ++
> >>   2 files changed, 32 insertions(+)
> >>
> >> diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
> >> index 0b6a554dfe27..41957b66ca52 100644
> >> --- a/lib/i915/gem_context.c
> >> +++ b/lib/i915/gem_context.c
> >> @@ -462,3 +462,33 @@ bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
> >>   
> >>          return __gem_execbuf(fd, &execbuf) == -ENOENT;
> >>   }
> >> +
> >> +/**
> >> + * gem_context_copy_engines:
> >> + * @src_fd: open i915 drm file descriptor where @src context belongs to
> >> + * @src: source engine map context id
> >> + * @dst_fd: open i915 drm file descriptor where @dst context belongs to
> >> + * @dst: destination engine map context id
> >> + *
> >> + * Special purpose wrapper for copying engine map from one context to another.
> >> + *
> >> + * In can be called regardless of whether the kernel supports context engine
> >> + * maps and is a no-op if not supported.
> >> + */
> >> +void
> >> +gem_context_copy_engines(int src_fd, uint32_t src, int dst_fd, uint32_t dst)
> >> +{
> >> +       I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, I915_EXEC_RING_MASK + 1);
> >> +       struct drm_i915_gem_context_param param = {
> >> +               .param = I915_CONTEXT_PARAM_ENGINES,
> >> +               .ctx_id = src,
> >> +               .size = sizeof(engines),
> >> +               .value = to_user_pointer(&engines),
> >> +       };
> >> +
> >> +       if (__gem_context_get_param(src_fd, &param) || !param.size)
> >> +               return;
> >> +
> >> +       param.ctx_id = dst;
> >> +       gem_context_set_param(dst_fd, &param);
> > 
> > You don't want to copy across the use-default set? You presume dst is
> > already using defaults?
> 
> Hm hm.. not sure. I guess it would be most in-line with what the helper 
> say on the tin to copy as is. I'll respin.

In which case, a preemptive
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

Patch
diff mbox series

diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 0b6a554dfe27..41957b66ca52 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -462,3 +462,33 @@  bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
 
 	return __gem_execbuf(fd, &execbuf) == -ENOENT;
 }
+
+/**
+ * gem_context_copy_engines:
+ * @src_fd: open i915 drm file descriptor where @src context belongs to
+ * @src: source engine map context id
+ * @dst_fd: open i915 drm file descriptor where @dst context belongs to
+ * @dst: destination engine map context id
+ *
+ * Special purpose wrapper for copying engine map from one context to another.
+ *
+ * In can be called regardless of whether the kernel supports context engine
+ * maps and is a no-op if not supported.
+ */
+void
+gem_context_copy_engines(int src_fd, uint32_t src, int dst_fd, uint32_t dst)
+{
+	I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, I915_EXEC_RING_MASK + 1);
+	struct drm_i915_gem_context_param param = {
+		.param = I915_CONTEXT_PARAM_ENGINES,
+		.ctx_id = src,
+		.size = sizeof(engines),
+		.value = to_user_pointer(&engines),
+	};
+
+	if (__gem_context_get_param(src_fd, &param) || !param.size)
+		return;
+
+	param.ctx_id = dst;
+	gem_context_set_param(dst_fd, &param);
+}
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index cf2ba33fee8f..15e5db281b79 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -42,6 +42,8 @@  uint32_t gem_context_clone(int i915,
 			   uint32_t src, unsigned int share,
 			   unsigned int flags);
 uint32_t gem_context_clone_with_engines(int i915, uint32_t src);
+void gem_context_copy_engines(int src_fd, uint32_t src,
+			      int dst_fd, uint32_t dst);
 
 uint32_t gem_queue_create(int i915);
 uint32_t gem_queue_clone_with_engines(int i915, uint32_t src);