From 727ecd99a4c91cd08cea7301d0e97d81d2d11d20 Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Tue, 11 May 2021 18:03:56 +0100 Subject: [PATCH] drm/doc/rfc: drop the i915_gem_lmem.h header The proper headers have now landed in include/uapi/drm/i915_drm.h, so we can drop i915_gem_lmem.h and instead just reference the real headers for pulling in the kernel doc. Suggested-by: Daniel Vetter Signed-off-by: Matthew Auld Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20210511170356.430284-1-matthew.auld@intel.com --- Documentation/gpu/rfc/i915_gem_lmem.h | 237 ------------------------ Documentation/gpu/rfc/i915_gem_lmem.rst | 6 +- 2 files changed, 3 insertions(+), 240 deletions(-) delete mode 100644 Documentation/gpu/rfc/i915_gem_lmem.h diff --git a/Documentation/gpu/rfc/i915_gem_lmem.h b/Documentation/gpu/rfc/i915_gem_lmem.h deleted file mode 100644 index d9c61bea0556f..0000000000000 --- a/Documentation/gpu/rfc/i915_gem_lmem.h +++ /dev/null @@ -1,237 +0,0 @@ -/** - * enum drm_i915_gem_memory_class - Supported memory classes - */ -enum drm_i915_gem_memory_class { - /** @I915_MEMORY_CLASS_SYSTEM: System memory */ - I915_MEMORY_CLASS_SYSTEM = 0, - /** @I915_MEMORY_CLASS_DEVICE: Device local-memory */ - I915_MEMORY_CLASS_DEVICE, -}; - -/** - * struct drm_i915_gem_memory_class_instance - Identify particular memory region - */ -struct drm_i915_gem_memory_class_instance { - /** @memory_class: See enum drm_i915_gem_memory_class */ - __u16 memory_class; - - /** @memory_instance: Which instance */ - __u16 memory_instance; -}; - -/** - * struct drm_i915_memory_region_info - Describes one region as known to the - * 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. - * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS - * at &drm_i915_query_item.query_id. - */ -struct drm_i915_memory_region_info { - /** @region: The class:instance pair encoding */ - struct drm_i915_gem_memory_class_instance region; - - /** @rsvd0: MBZ */ - __u32 rsvd0; - - /** @probed_size: Memory probed by the driver (-1 = unknown) */ - __u64 probed_size; - - /** @unallocated_size: Estimate of memory remaining (-1 = unknown) */ - __u64 unallocated_size; - - /** @rsvd1: MBZ */ - __u64 rsvd1[8]; -}; - -/** - * struct drm_i915_query_memory_regions - * - * The region info query enumerates all regions known to the driver by filling - * in an array of struct drm_i915_memory_region_info structures. - * - * Example for getting the list of supported regions: - * - * .. code-block:: C - * - * struct drm_i915_query_memory_regions *info; - * struct drm_i915_query_item item = { - * .query_id = DRM_I915_QUERY_MEMORY_REGIONS; - * }; - * struct drm_i915_query query = { - * .num_items = 1, - * .items_ptr = (uintptr_t)&item, - * }; - * int err, i; - * - * // First query the size of the blob we need, this needs to be large - * // enough to hold our array of regions. The kernel will fill out the - * // item.length for us, which is the number of bytes we need. - * err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query); - * if (err) ... - * - * info = calloc(1, item.length); - * // Now that we allocated the required number of bytes, we call the ioctl - * // again, this time with the data_ptr pointing to our newly allocated - * // blob, which the kernel can then populate with the all the region info. - * item.data_ptr = (uintptr_t)&info, - * - * err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query); - * if (err) ... - * - * // We can now access each region in the array - * for (i = 0; i < info->num_regions; i++) { - * struct drm_i915_memory_region_info mr = info->regions[i]; - * u16 class = mr.region.class; - * u16 instance = mr.region.instance; - * - * .... - * } - * - * free(info); - */ -struct drm_i915_query_memory_regions { - /** @num_regions: Number of supported regions */ - __u32 num_regions; - - /** @rsvd: MBZ */ - __u32 rsvd[3]; - - /** @regions: Info about each supported region */ - struct drm_i915_memory_region_info regions[]; -}; - -#define DRM_I915_GEM_CREATE_EXT 0xdeadbeaf -#define DRM_IOCTL_I915_GEM_CREATE_EXT DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_CREATE_EXT, struct drm_i915_gem_create_ext) - -/** - * struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added - * extension support using struct i915_user_extension. - * - * Note that in the future we want to have our buffer flags here, at least for - * the stuff that is immutable. Previously we would have two ioctls, one to - * create the object with gem_create, and another to apply various parameters, - * however this creates some ambiguity for the params which are considered - * immutable. Also in general we're phasing out the various SET/GET ioctls. - */ -struct drm_i915_gem_create_ext { - /** - * @size: Requested size for the object. - * - * The (page-aligned) allocated size for the object will be returned. - * - * Note that for some devices we have might have further minimum - * page-size restrictions(larger than 4K), like for device local-memory. - * However in general the final size here should always reflect any - * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS - * extension to place the object in device local-memory. - */ - __u64 size; - /** - * @handle: Returned handle for the object. - * - * Object handles are nonzero. - */ - __u32 handle; - /** @flags: MBZ */ - __u32 flags; - /** - * @extensions: The chain of extensions to apply to this object. - * - * This will be useful in the future when we need to support several - * different extensions, and we need to apply more than one when - * creating the object. See struct i915_user_extension. - * - * If we don't supply any extensions then we get the same old gem_create - * behaviour. - * - * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see - * struct drm_i915_gem_create_ext_memory_regions. - */ -#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0 - __u64 extensions; -}; - -/** - * struct drm_i915_gem_create_ext_memory_regions - The - * I915_GEM_CREATE_EXT_MEMORY_REGIONS extension. - * - * Set the object with the desired set of placements/regions in priority - * order. Each entry must be unique and supported by the device. - * - * This is provided as an array of struct drm_i915_gem_memory_class_instance, or - * an equivalent layout of class:instance pair encodings. See struct - * drm_i915_query_memory_regions and DRM_I915_QUERY_MEMORY_REGIONS for how to - * query the supported regions for a device. - * - * As an example, on discrete devices, if we wish to set the placement as - * device local-memory we can do something like: - * - * .. code-block:: C - * - * struct drm_i915_gem_memory_class_instance region_lmem = { - * .memory_class = I915_MEMORY_CLASS_DEVICE, - * .memory_instance = 0, - * }; - * struct drm_i915_gem_create_ext_memory_regions regions = { - * .base = { .name = I915_GEM_CREATE_EXT_MEMORY_REGIONS }, - * .regions = (uintptr_t)®ion_lmem, - * .num_regions = 1, - * }; - * struct drm_i915_gem_create_ext create_ext = { - * .size = 16 * PAGE_SIZE, - * .extensions = (uintptr_t)®ions, - * }; - * - * int err = ioctl(fd, DRM_IOCTL_I915_GEM_CREATE_EXT, &create_ext); - * if (err) ... - * - * 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 - * should account for any rounding up, if required. - */ -struct drm_i915_gem_create_ext_memory_regions { - /** @base: Extension link. See struct i915_user_extension. */ - struct i915_user_extension base; - - /** @pad: MBZ */ - __u32 pad; - /** @num_regions: Number of elements in the @regions array. */ - __u32 num_regions; - /** - * @regions: The regions/placements array. - * - * An array of struct drm_i915_gem_memory_class_instance. - */ - __u64 regions; -}; diff --git a/Documentation/gpu/rfc/i915_gem_lmem.rst b/Documentation/gpu/rfc/i915_gem_lmem.rst index 1d344c5930185..675ba8620d664 100644 --- a/Documentation/gpu/rfc/i915_gem_lmem.rst +++ b/Documentation/gpu/rfc/i915_gem_lmem.rst @@ -48,7 +48,7 @@ particular instance, since we can have more than one per class. In the future we also want to expose more information which can further describe the capabilities of a region. -.. kernel-doc:: Documentation/gpu/rfc/i915_gem_lmem.h +.. kernel-doc:: include/uapi/drm/i915_drm.h :functions: drm_i915_gem_memory_class drm_i915_gem_memory_class_instance drm_i915_memory_region_info drm_i915_query_memory_regions GEM_CREATE_EXT @@ -61,7 +61,7 @@ Side note: We also need to support PXP[1] in the near future, which is also applicable to integrated platforms, and adds its own gem_create_ext extension, which basically lets userspace mark a buffer as "protected". -.. kernel-doc:: Documentation/gpu/rfc/i915_gem_lmem.h +.. kernel-doc:: include/uapi/drm/i915_drm.h :functions: drm_i915_gem_create_ext I915_GEM_CREATE_EXT_MEMORY_REGIONS @@ -73,7 +73,7 @@ them each to use the class/instance encoding, as per the output of the regions query. Having the list in priority order will be useful in the future when placing an object, say during eviction. -.. kernel-doc:: Documentation/gpu/rfc/i915_gem_lmem.h +.. kernel-doc:: include/uapi/drm/i915_drm.h :functions: drm_i915_gem_create_ext_memory_regions One fair criticism here is that this seems a little over-engineered[2]. If we -- 2.39.5