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drm-uapi/i915_drm.h: Update from drm-next (2022-07-22)

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git://anongit.freedesktop.org/drm/drm 417c1c1963549e9a48b83ada59d90258e38c6594

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16739>
This commit is contained in:
Jordan Justen
2022-07-22 10:30:14 -07:00
committed by Marge Bot
parent fc1eec0a27
commit 33bf0d7437
1 changed files with 305 additions and 92 deletions
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397
include/drm-uapi/i915_drm.h
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@@ -751,14 +751,27 @@ typedef struct drm_i915_irq_wait {
/* Must be kept compact -- no holes and well documented */ /* Must be kept compact -- no holes and well documented */
typedef struct drm_i915_getparam { /**
* struct drm_i915_getparam - Driver parameter query structure.
*/
struct drm_i915_getparam {
/** @param: Driver parameter to query. */
__s32 param; __s32 param;
/*
/**
* @value: Address of memory where queried value should be put.
*
* WARNING: Using pointers instead of fixed-size u64 means we need to write * WARNING: Using pointers instead of fixed-size u64 means we need to write
* compat32 code. Don't repeat this mistake. * compat32 code. Don't repeat this mistake.
*/ */
int *value; int *value;
} drm_i915_getparam_t; };
/**
* typedef drm_i915_getparam_t - Driver parameter query structure.
* See struct drm_i915_getparam.
*/
typedef struct drm_i915_getparam drm_i915_getparam_t;
/* Ioctl to set kernel params: /* Ioctl to set kernel params:
*/ */
@@ -1239,76 +1252,119 @@ struct drm_i915_gem_exec_object2 {
__u64 rsvd2; __u64 rsvd2;
}; };
/**
* struct drm_i915_gem_exec_fence - An input or output fence for the execbuf
* ioctl.
*
* The request will wait for input fence to signal before submission.
*
* The returned output fence will be signaled after the completion of the
* request.
*/
struct drm_i915_gem_exec_fence { struct drm_i915_gem_exec_fence {
/** /** @handle: User's handle for a drm_syncobj to wait on or signal. */
* User's handle for a drm_syncobj to wait on or signal.
*/
__u32 handle; __u32 handle;
/**
* @flags: Supported flags are:
*
* I915_EXEC_FENCE_WAIT:
* Wait for the input fence before request submission.
*
* I915_EXEC_FENCE_SIGNAL:
* Return request completion fence as output
*/
__u32 flags;
#define I915_EXEC_FENCE_WAIT (1<<0) #define I915_EXEC_FENCE_WAIT (1<<0)
#define I915_EXEC_FENCE_SIGNAL (1<<1) #define I915_EXEC_FENCE_SIGNAL (1<<1)
#define __I915_EXEC_FENCE_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SIGNAL << 1)) #define __I915_EXEC_FENCE_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SIGNAL << 1))
__u32 flags;
}; };
/* /**
* See drm_i915_gem_execbuffer_ext_timeline_fences. * struct drm_i915_gem_execbuffer_ext_timeline_fences - Timeline fences
*/ * for execbuf ioctl.
#define DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES 0 *
/*
* This structure describes an array of drm_syncobj and associated points for * This structure describes an array of drm_syncobj and associated points for
* timeline variants of drm_syncobj. It is invalid to append this structure to * timeline variants of drm_syncobj. It is invalid to append this structure to
* the execbuf if I915_EXEC_FENCE_ARRAY is set. * the execbuf if I915_EXEC_FENCE_ARRAY is set.
*/ */
struct drm_i915_gem_execbuffer_ext_timeline_fences { struct drm_i915_gem_execbuffer_ext_timeline_fences {
#define DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES 0
/** @base: Extension link. See struct i915_user_extension. */
struct i915_user_extension base; struct i915_user_extension base;
/** /**
* Number of element in the handles_ptr & value_ptr arrays. * @fence_count: Number of elements in the @handles_ptr & @value_ptr
* arrays.
*/ */
__u64 fence_count; __u64 fence_count;
/** /**
* Pointer to an array of struct drm_i915_gem_exec_fence of length * @handles_ptr: Pointer to an array of struct drm_i915_gem_exec_fence
* fence_count. * of length @fence_count.
*/ */
__u64 handles_ptr; __u64 handles_ptr;
/** /**
* Pointer to an array of u64 values of length fence_count. Values * @values_ptr: Pointer to an array of u64 values of length
* must be 0 for a binary drm_syncobj. A Value of 0 for a timeline * @fence_count.
* drm_syncobj is invalid as it turns a drm_syncobj into a binary one. * Values must be 0 for a binary drm_syncobj. A Value of 0 for a
* timeline drm_syncobj is invalid as it turns a drm_syncobj into a
* binary one.
*/ */
__u64 values_ptr; __u64 values_ptr;
}; };
/**
* struct drm_i915_gem_execbuffer2 - Structure for DRM_I915_GEM_EXECBUFFER2
* ioctl.
*/
struct drm_i915_gem_execbuffer2 { struct drm_i915_gem_execbuffer2 {
/** /** @buffers_ptr: Pointer to a list of gem_exec_object2 structs */
* List of gem_exec_object2 structs
*/
__u64 buffers_ptr; __u64 buffers_ptr;
/** @buffer_count: Number of elements in @buffers_ptr array */
__u32 buffer_count; __u32 buffer_count;
/** Offset in the batchbuffer to start execution from. */
__u32 batch_start_offset;
/** Bytes used in batchbuffer from batch_start_offset */
__u32 batch_len;
__u32 DR1;
__u32 DR4;
__u32 num_cliprects;
/** /**
* This is a struct drm_clip_rect *cliprects if I915_EXEC_FENCE_ARRAY * @batch_start_offset: Offset in the batchbuffer to start execution
* & I915_EXEC_USE_EXTENSIONS are not set. * from.
*/
__u32 batch_start_offset;
/**
* @batch_len: Length in bytes of the batch buffer, starting from the
* @batch_start_offset. If 0, length is assumed to be the batch buffer
* object size.
*/
__u32 batch_len;
/** @DR1: deprecated */
__u32 DR1;
/** @DR4: deprecated */
__u32 DR4;
/** @num_cliprects: See @cliprects_ptr */
__u32 num_cliprects;
/**
* @cliprects_ptr: Kernel clipping was a DRI1 misfeature.
*
* It is invalid to use this field if I915_EXEC_FENCE_ARRAY or
* I915_EXEC_USE_EXTENSIONS flags are not set.
* *
* If I915_EXEC_FENCE_ARRAY is set, then this is a pointer to an array * If I915_EXEC_FENCE_ARRAY is set, then this is a pointer to an array
* of struct drm_i915_gem_exec_fence and num_cliprects is the length * of &drm_i915_gem_exec_fence and @num_cliprects is the length of the
* of the array. * array.
* *
* If I915_EXEC_USE_EXTENSIONS is set, then this is a pointer to a * If I915_EXEC_USE_EXTENSIONS is set, then this is a pointer to a
* single struct i915_user_extension and num_cliprects is 0. * single &i915_user_extension and num_cliprects is 0.
*/ */
__u64 cliprects_ptr; __u64 cliprects_ptr;
/** @flags: Execbuf flags */
__u64 flags;
#define I915_EXEC_RING_MASK (0x3f) #define I915_EXEC_RING_MASK (0x3f)
#define I915_EXEC_DEFAULT (0<<0) #define I915_EXEC_DEFAULT (0<<0)
#define I915_EXEC_RENDER (1<<0) #define I915_EXEC_RENDER (1<<0)
@@ -1326,10 +1382,6 @@ struct drm_i915_gem_execbuffer2 {
#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */ #define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */
#define I915_EXEC_CONSTANTS_ABSOLUTE (1<<6) #define I915_EXEC_CONSTANTS_ABSOLUTE (1<<6)
#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */ #define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */
__u64 flags;
__u64 rsvd1; /* now used for context info */
__u64 rsvd2;
};
/** Resets the SO write offset registers for transform feedback on gen7. */ /** Resets the SO write offset registers for transform feedback on gen7. */
#define I915_EXEC_GEN7_SOL_RESET (1<<8) #define I915_EXEC_GEN7_SOL_RESET (1<<8)
@@ -1432,9 +1484,23 @@ struct drm_i915_gem_execbuffer2 {
* drm_i915_gem_execbuffer_ext enum. * drm_i915_gem_execbuffer_ext enum.
*/ */
#define I915_EXEC_USE_EXTENSIONS (1 << 21) #define I915_EXEC_USE_EXTENSIONS (1 << 21)
#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_USE_EXTENSIONS << 1)) #define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_USE_EXTENSIONS << 1))
/** @rsvd1: Context id */
__u64 rsvd1;
/**
* @rsvd2: in and out sync_file file descriptors.
*
* When I915_EXEC_FENCE_IN or I915_EXEC_FENCE_SUBMIT flag is set, the
* lower 32 bits of this field will have the in sync_file fd (input).
*
* When I915_EXEC_FENCE_OUT flag is set, the upper 32 bits of this
* field will have the out sync_file fd (output).
*/
__u64 rsvd2;
};
#define I915_EXEC_CONTEXT_ID_MASK (0xffffffff) #define I915_EXEC_CONTEXT_ID_MASK (0xffffffff)
#define i915_execbuffer2_set_context_id(eb2, context) \ #define i915_execbuffer2_set_context_id(eb2, context) \
(eb2).rsvd1 = context & I915_EXEC_CONTEXT_ID_MASK (eb2).rsvd1 = context & I915_EXEC_CONTEXT_ID_MASK
@@ -1814,19 +1880,58 @@ struct drm_i915_gem_context_create {
__u32 pad; __u32 pad;
}; };
/**
* struct drm_i915_gem_context_create_ext - Structure for creating contexts.
*/
struct drm_i915_gem_context_create_ext { struct drm_i915_gem_context_create_ext {
__u32 ctx_id; /* output: id of new context*/ /** @ctx_id: Id of the created context (output) */
__u32 ctx_id;
/**
* @flags: Supported flags are:
*
* I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS:
*
* Extensions may be appended to this structure and driver must check
* for those. See @extensions.
*
* I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE
*
* Created context will have single timeline.
*/
__u32 flags; __u32 flags;
#define I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS (1u << 0) #define I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS (1u << 0)
#define I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE (1u << 1) #define I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE (1u << 1)
#define I915_CONTEXT_CREATE_FLAGS_UNKNOWN \ #define I915_CONTEXT_CREATE_FLAGS_UNKNOWN \
(-(I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE << 1)) (-(I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE << 1))
/**
* @extensions: Zero-terminated chain of extensions.
*
* I915_CONTEXT_CREATE_EXT_SETPARAM:
* Context parameter to set or query during context creation.
* See struct drm_i915_gem_context_create_ext_setparam.
*
* I915_CONTEXT_CREATE_EXT_CLONE:
* This extension has been removed. On the off chance someone somewhere
* has attempted to use it, never re-use this extension number.
*/
__u64 extensions; __u64 extensions;
#define I915_CONTEXT_CREATE_EXT_SETPARAM 0
#define I915_CONTEXT_CREATE_EXT_CLONE 1
}; };
/**
* struct drm_i915_gem_context_param - Context parameter to set or query.
*/
struct drm_i915_gem_context_param { struct drm_i915_gem_context_param {
/** @ctx_id: Context id */
__u32 ctx_id; __u32 ctx_id;
/** @size: Size of the parameter @value */
__u32 size; __u32 size;
/** @param: Parameter to set or query */
__u64 param; __u64 param;
#define I915_CONTEXT_PARAM_BAN_PERIOD 0x1 #define I915_CONTEXT_PARAM_BAN_PERIOD 0x1
/* I915_CONTEXT_PARAM_NO_ZEROMAP has been removed. On the off chance /* I915_CONTEXT_PARAM_NO_ZEROMAP has been removed. On the off chance
@@ -1973,6 +2078,7 @@ struct drm_i915_gem_context_param {
#define I915_CONTEXT_PARAM_PROTECTED_CONTENT 0xd #define I915_CONTEXT_PARAM_PROTECTED_CONTENT 0xd
/* Must be kept compact -- no holes and well documented */ /* Must be kept compact -- no holes and well documented */
/** @value: Context parameter value to be set or queried */
__u64 value; __u64 value;
}; };
@@ -2371,23 +2477,29 @@ struct i915_context_param_engines {
struct i915_engine_class_instance engines[N__]; \ struct i915_engine_class_instance engines[N__]; \
} __attribute__((packed)) name__ } __attribute__((packed)) name__
/**
* struct drm_i915_gem_context_create_ext_setparam - Context parameter
* to set or query during context creation.
*/
struct drm_i915_gem_context_create_ext_setparam { struct drm_i915_gem_context_create_ext_setparam {
#define I915_CONTEXT_CREATE_EXT_SETPARAM 0 /** @base: Extension link. See struct i915_user_extension. */
struct i915_user_extension base; struct i915_user_extension base;
/**
* @param: Context parameter to set or query.
* See struct drm_i915_gem_context_param.
*/
struct drm_i915_gem_context_param param; struct drm_i915_gem_context_param param;
}; };
/* This API has been removed. On the off chance someone somewhere has
* attempted to use it, never re-use this extension number.
*/
#define I915_CONTEXT_CREATE_EXT_CLONE 1
struct drm_i915_gem_context_destroy { struct drm_i915_gem_context_destroy {
__u32 ctx_id; __u32 ctx_id;
__u32 pad; __u32 pad;
}; };
/* /**
* struct drm_i915_gem_vm_control - Structure to create or destroy VM.
*
* DRM_I915_GEM_VM_CREATE - * DRM_I915_GEM_VM_CREATE -
* *
* Create a new virtual memory address space (ppGTT) for use within a context * Create a new virtual memory address space (ppGTT) for use within a context
@@ -2397,20 +2509,23 @@ struct drm_i915_gem_context_destroy {
* The id of new VM (bound to the fd) for use with I915_CONTEXT_PARAM_VM is * The id of new VM (bound to the fd) for use with I915_CONTEXT_PARAM_VM is
* returned in the outparam @id. * returned in the outparam @id.
* *
* No flags are defined, with all bits reserved and must be zero.
*
* An extension chain maybe provided, starting with @extensions, and terminated * An extension chain maybe provided, starting with @extensions, and terminated
* by the @next_extension being 0. Currently, no extensions are defined. * by the @next_extension being 0. Currently, no extensions are defined.
* *
* DRM_I915_GEM_VM_DESTROY - * DRM_I915_GEM_VM_DESTROY -
* *
* Destroys a previously created VM id, specified in @id. * Destroys a previously created VM id, specified in @vm_id.
* *
* No extensions or flags are allowed currently, and so must be zero. * No extensions or flags are allowed currently, and so must be zero.
*/ */
struct drm_i915_gem_vm_control { struct drm_i915_gem_vm_control {
/** @extensions: Zero-terminated chain of extensions. */
__u64 extensions; __u64 extensions;
/** @flags: reserved for future usage, currently MBZ */
__u32 flags; __u32 flags;
/** @vm_id: Id of the VM created or to be destroyed */
__u32 vm_id; __u32 vm_id;
}; };
@@ -3207,36 +3322,6 @@ struct drm_i915_gem_memory_class_instance {
* struct drm_i915_memory_region_info - Describes one region as known to the * struct drm_i915_memory_region_info - Describes one region as known to the
* driver. * driver.
* *
* Note that we reserve some stuff here for potential future work. As an example
* we might want expose the capabilities for a given region, which could include
* things like if the region is CPU mappable/accessible, what are the supported
* mapping types etc.
*
* Note that to extend struct drm_i915_memory_region_info and struct
* drm_i915_query_memory_regions in the future the plan is to do the following:
*
* .. code-block:: C
*
* struct drm_i915_memory_region_info {
* struct drm_i915_gem_memory_class_instance region;
* union {
* __u32 rsvd0;
* __u32 new_thing1;
* };
* ...
* union {
* __u64 rsvd1[8];
* struct {
* __u64 new_thing2;
* __u64 new_thing3;
* ...
* };
* };
* };
*
* With this things should remain source compatible between versions for
* userspace, even as we add new fields.
*
* Note this is using both struct drm_i915_query_item and struct drm_i915_query. * Note this is using both struct drm_i915_query_item and struct drm_i915_query.
* For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS
* at &drm_i915_query_item.query_id. * at &drm_i915_query_item.query_id.
@@ -3248,14 +3333,81 @@ struct drm_i915_memory_region_info {
/** @rsvd0: MBZ */ /** @rsvd0: MBZ */
__u32 rsvd0; __u32 rsvd0;
/** @probed_size: Memory probed by the driver (-1 = unknown) */ /**
* @probed_size: Memory probed by the driver
*
* Note that it should not be possible to ever encounter a zero value
* here, also note that no current region type will ever return -1 here.
* Although for future region types, this might be a possibility. The
* same applies to the other size fields.
*/
__u64 probed_size; __u64 probed_size;
/** @unallocated_size: Estimate of memory remaining (-1 = unknown) */ /**
* @unallocated_size: Estimate of memory remaining
*
* Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting.
* Without this (or if this is an older kernel) the value here will
* always equal the @probed_size. Note this is only currently tracked
* for I915_MEMORY_CLASS_DEVICE regions (for other types the value here
* will always equal the @probed_size).
*/
__u64 unallocated_size; __u64 unallocated_size;
/** @rsvd1: MBZ */ union {
__u64 rsvd1[8]; /** @rsvd1: MBZ */
__u64 rsvd1[8];
struct {
/**
* @probed_cpu_visible_size: Memory probed by the driver
* that is CPU accessible.
*
* This will be always be <= @probed_size, and the
* remainder (if there is any) will not be CPU
* accessible.
*
* On systems without small BAR, the @probed_size will
* always equal the @probed_cpu_visible_size, since all
* of it will be CPU accessible.
*
* Note this is only tracked for
* I915_MEMORY_CLASS_DEVICE regions (for other types the
* value here will always equal the @probed_size).
*
* Note that if the value returned here is zero, then
* this must be an old kernel which lacks the relevant
* small-bar uAPI support (including
* I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS), but on
* such systems we should never actually end up with a
* small BAR configuration, assuming we are able to load
* the kernel module. Hence it should be safe to treat
* this the same as when @probed_cpu_visible_size ==
* @probed_size.
*/
__u64 probed_cpu_visible_size;
/**
* @unallocated_cpu_visible_size: Estimate of CPU
* visible memory remaining.
*
* Note this is only tracked for
* I915_MEMORY_CLASS_DEVICE regions (for other types the
* value here will always equal the
* @probed_cpu_visible_size).
*
* Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable
* accounting. Without this the value here will always
* equal the @probed_cpu_visible_size. Note this is only
* currently tracked for I915_MEMORY_CLASS_DEVICE
* regions (for other types the value here will also
* always equal the @probed_cpu_visible_size).
*
* If this is an older kernel the value here will be
* zero, see also @probed_cpu_visible_size.
*/
__u64 unallocated_cpu_visible_size;
};
};
}; };
/** /**
@@ -3329,11 +3481,11 @@ struct drm_i915_query_memory_regions {
* struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added * struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added
* extension support using struct i915_user_extension. * extension support using struct i915_user_extension.
* *
* Note that in the future we want to have our buffer flags here, at least for * Note that new buffer flags should be added here, at least for the stuff that
* the stuff that is immutable. Previously we would have two ioctls, one to * is immutable. Previously we would have two ioctls, one to create the object
* create the object with gem_create, and another to apply various parameters, * with gem_create, and another to apply various parameters, however this
* however this creates some ambiguity for the params which are considered * creates some ambiguity for the params which are considered immutable. Also in
* immutable. Also in general we're phasing out the various SET/GET ioctls. * general we're phasing out the various SET/GET ioctls.
*/ */
struct drm_i915_gem_create_ext { struct drm_i915_gem_create_ext {
/** /**
@@ -3341,7 +3493,6 @@ struct drm_i915_gem_create_ext {
* *
* The (page-aligned) allocated size for the object will be returned. * The (page-aligned) allocated size for the object will be returned.
* *
*
* DG2 64K min page size implications: * DG2 64K min page size implications:
* *
* On discrete platforms, starting from DG2, we have to contend with GTT * On discrete platforms, starting from DG2, we have to contend with GTT
@@ -3353,7 +3504,9 @@ struct drm_i915_gem_create_ext {
* *
* Note that the returned size here will always reflect any required * Note that the returned size here will always reflect any required
* rounding up done by the kernel, i.e 4K will now become 64K on devices * rounding up done by the kernel, i.e 4K will now become 64K on devices
* such as DG2. * such as DG2. The kernel will always select the largest minimum
* page-size for the set of possible placements as the value to use when
* rounding up the @size.
* *
* Special DG2 GTT address alignment requirement: * Special DG2 GTT address alignment requirement:
* *
@@ -3377,14 +3530,58 @@ struct drm_i915_gem_create_ext {
* is deemed to be a good compromise. * is deemed to be a good compromise.
*/ */
__u64 size; __u64 size;
/** /**
* @handle: Returned handle for the object. * @handle: Returned handle for the object.
* *
* Object handles are nonzero. * Object handles are nonzero.
*/ */
__u32 handle; __u32 handle;
/** @flags: MBZ */
/**
* @flags: Optional flags.
*
* Supported values:
*
* I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS - Signal to the kernel that
* the object will need to be accessed via the CPU.
*
* Only valid when placing objects in I915_MEMORY_CLASS_DEVICE, and only
* strictly required on configurations where some subset of the device
* memory is directly visible/mappable through the CPU (which we also
* call small BAR), like on some DG2+ systems. Note that this is quite
* undesirable, but due to various factors like the client CPU, BIOS etc
* it's something we can expect to see in the wild. See
* &drm_i915_memory_region_info.probed_cpu_visible_size for how to
* determine if this system applies.
*
* Note that one of the placements MUST be I915_MEMORY_CLASS_SYSTEM, to
* ensure the kernel can always spill the allocation to system memory,
* if the object can't be allocated in the mappable part of
* I915_MEMORY_CLASS_DEVICE.
*
* Also note that since the kernel only supports flat-CCS on objects
* that can *only* be placed in I915_MEMORY_CLASS_DEVICE, we therefore
* don't support I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS together with
* flat-CCS.
*
* Without this hint, the kernel will assume that non-mappable
* I915_MEMORY_CLASS_DEVICE is preferred for this object. Note that the
* kernel can still migrate the object to the mappable part, as a last
* resort, if userspace ever CPU faults this object, but this might be
* expensive, and so ideally should be avoided.
*
* On older kernels which lack the relevant small-bar uAPI support (see
* also &drm_i915_memory_region_info.probed_cpu_visible_size),
* usage of the flag will result in an error, but it should NEVER be
* possible to end up with a small BAR configuration, assuming we can
* also successfully load the i915 kernel module. In such cases the
* entire I915_MEMORY_CLASS_DEVICE region will be CPU accessible, and as
* such there are zero restrictions on where the object can be placed.
*/
#define I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS (1 << 0)
__u32 flags; __u32 flags;
/** /**
* @extensions: The chain of extensions to apply to this object. * @extensions: The chain of extensions to apply to this object.
* *
@@ -3443,6 +3640,22 @@ struct drm_i915_gem_create_ext {
* At which point we get the object handle in &drm_i915_gem_create_ext.handle, * At which point we get the object handle in &drm_i915_gem_create_ext.handle,
* along with the final object size in &drm_i915_gem_create_ext.size, which * along with the final object size in &drm_i915_gem_create_ext.size, which
* should account for any rounding up, if required. * should account for any rounding up, if required.
*
* Note that userspace has no means of knowing the current backing region
* for objects where @num_regions is larger than one. The kernel will only
* ensure that the priority order of the @regions array is honoured, either
* when initially placing the object, or when moving memory around due to
* memory pressure
*
* On Flat-CCS capable HW, compression is supported for the objects residing
* in I915_MEMORY_CLASS_DEVICE. When such objects (compressed) have other
* memory class in @regions and migrated (by i915, due to memory
* constraints) to the non I915_MEMORY_CLASS_DEVICE region, then i915 needs to
* decompress the content. But i915 doesn't have the required information to
* decompress the userspace compressed objects.
*
* So i915 supports Flat-CCS, on the objects which can reside only on
* I915_MEMORY_CLASS_DEVICE regions.
*/ */
struct drm_i915_gem_create_ext_memory_regions { struct drm_i915_gem_create_ext_memory_regions {
/** @base: Extension link. See struct i915_user_extension. */ /** @base: Extension link. See struct i915_user_extension. */