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![Matthew Auld](/assets/img/avatar_default.png)
Intended for upstream testing so that we can still exercise the LMEM plumbing and !i915_ggtt_has_aperture paths. Smoke tested on Skull Canyon device. This works by allocating an intel_memory_region for a reserved portion of system memory, which we treat like LMEM. For the LMEMBAR we steal the aperture and 1:1 it map to the stolen region. To enable simply set the i915 modparam fake_lmem_start= on the kernel cmdline with the start of reserved region(see memmap=). The size of the region we can use is determined by the size of the mappable aperture, so the size of reserved region should be >= mappable_end. For now we only enable for the selftests. Depends on CONFIG_DRM_I915_UNSTABLE being enabled. eg. memmap=2G$16G i915.fake_lmem_start=0x400000000 v2: make fake_lmem_start an i915 modparam Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20191030173320.8850-1-matthew.auld@intel.com
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __INTEL_MEMORY_REGION_H__
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#define __INTEL_MEMORY_REGION_H__
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#include <linux/kref.h>
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#include <linux/ioport.h>
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#include <linux/mutex.h>
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#include <linux/io-mapping.h>
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#include <drm/drm_mm.h>
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#include "i915_buddy.h"
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struct drm_i915_private;
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struct drm_i915_gem_object;
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struct intel_memory_region;
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struct sg_table;
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/**
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* Base memory type
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*/
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enum intel_memory_type {
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INTEL_MEMORY_SYSTEM = 0,
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INTEL_MEMORY_LOCAL,
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INTEL_MEMORY_STOLEN,
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};
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enum intel_region_id {
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INTEL_REGION_SMEM = 0,
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INTEL_REGION_LMEM,
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INTEL_REGION_STOLEN,
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INTEL_REGION_UNKNOWN, /* Should be last */
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};
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#define REGION_SMEM BIT(INTEL_REGION_SMEM)
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#define REGION_LMEM BIT(INTEL_REGION_LMEM)
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#define REGION_STOLEN BIT(INTEL_REGION_STOLEN)
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#define INTEL_MEMORY_TYPE_SHIFT 16
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#define MEMORY_TYPE_FROM_REGION(r) (ilog2((r) >> INTEL_MEMORY_TYPE_SHIFT))
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#define MEMORY_INSTANCE_FROM_REGION(r) (ilog2((r) & 0xffff))
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#define I915_ALLOC_MIN_PAGE_SIZE BIT(0)
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#define I915_ALLOC_CONTIGUOUS BIT(1)
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/**
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* Memory regions encoded as type | instance
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*/
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extern const u32 intel_region_map[];
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struct intel_memory_region_ops {
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unsigned int flags;
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int (*init)(struct intel_memory_region *mem);
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void (*release)(struct intel_memory_region *mem);
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struct drm_i915_gem_object *
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(*create_object)(struct intel_memory_region *mem,
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resource_size_t size,
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unsigned int flags);
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};
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struct intel_memory_region {
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struct drm_i915_private *i915;
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const struct intel_memory_region_ops *ops;
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struct io_mapping iomap;
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struct resource region;
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/* For fake LMEM */
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struct drm_mm_node fake_mappable;
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struct i915_buddy_mm mm;
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struct mutex mm_lock;
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struct kref kref;
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resource_size_t io_start;
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resource_size_t min_page_size;
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unsigned int type;
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unsigned int instance;
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unsigned int id;
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dma_addr_t remap_addr;
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struct {
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struct mutex lock; /* Protects access to objects */
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struct list_head list;
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struct list_head purgeable;
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} objects;
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};
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int intel_memory_region_init_buddy(struct intel_memory_region *mem);
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void intel_memory_region_release_buddy(struct intel_memory_region *mem);
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int __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
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resource_size_t size,
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unsigned int flags,
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struct list_head *blocks);
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struct i915_buddy_block *
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__intel_memory_region_get_block_buddy(struct intel_memory_region *mem,
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resource_size_t size,
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unsigned int flags);
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void __intel_memory_region_put_pages_buddy(struct intel_memory_region *mem,
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struct list_head *blocks);
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void __intel_memory_region_put_block_buddy(struct i915_buddy_block *block);
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struct intel_memory_region *
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intel_memory_region_create(struct drm_i915_private *i915,
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resource_size_t start,
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resource_size_t size,
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resource_size_t min_page_size,
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resource_size_t io_start,
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const struct intel_memory_region_ops *ops);
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struct intel_memory_region *
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intel_memory_region_get(struct intel_memory_region *mem);
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void intel_memory_region_put(struct intel_memory_region *mem);
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int intel_memory_regions_hw_probe(struct drm_i915_private *i915);
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void intel_memory_regions_driver_release(struct drm_i915_private *i915);
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#endif
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