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b04ce1e718
When remaining resources are being cleaned up on driver close,
outstanding VM mappings may result in resources being leaked, due
to an object reference loop, as shown below, with each object (or
set of objects) referencing the object below it:
PVR GEM Object
GPU scheduler "finished" fence
GPU scheduler “scheduled” fence
PVR driver “done” fence
PVR Context
PVR VM Context
PVR VM Mappings
PVR GEM Object
The reference that the PVR VM Context has on the VM mappings is a
soft one, in the sense that the freeing of outstanding VM mappings
is done as part of VM context destruction; no reference counts are
involved, as is the case for all the other references in the loop.
To break the reference loop during cleanup, free the outstanding
VM mappings before destroying the PVR Context associated with the
VM context.
Signed-off-by: Brendan King <brendan.king@imgtec.com>
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/8a25924f-1bb7-4d9a-a346-58e871dfb1d1@imgtec.com
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
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/* Copyright (c) 2023 Imagination Technologies Ltd. */
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#ifndef PVR_VM_H
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#define PVR_VM_H
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#include "pvr_rogue_mmu_defs.h"
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#include <uapi/drm/pvr_drm.h>
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#include <linux/types.h>
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/* Forward declaration from "pvr_device.h" */
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struct pvr_device;
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struct pvr_file;
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/* Forward declaration from "pvr_gem.h" */
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struct pvr_gem_object;
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/* Forward declaration from "pvr_vm.c" */
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struct pvr_vm_context;
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/* Forward declaration from <uapi/drm/pvr_drm.h> */
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struct drm_pvr_ioctl_get_heap_info_args;
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/* Forward declaration from <drm/drm_exec.h> */
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struct drm_exec;
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/* Functions defined in pvr_vm.c */
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bool pvr_device_addr_is_valid(u64 device_addr);
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bool pvr_device_addr_and_size_are_valid(struct pvr_vm_context *vm_ctx,
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u64 device_addr, u64 size);
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struct pvr_vm_context *pvr_vm_create_context(struct pvr_device *pvr_dev,
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bool is_userspace_context);
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int pvr_vm_map(struct pvr_vm_context *vm_ctx,
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struct pvr_gem_object *pvr_obj, u64 pvr_obj_offset,
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u64 device_addr, u64 size);
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int pvr_vm_unmap(struct pvr_vm_context *vm_ctx, u64 device_addr, u64 size);
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void pvr_vm_unmap_all(struct pvr_vm_context *vm_ctx);
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dma_addr_t pvr_vm_get_page_table_root_addr(struct pvr_vm_context *vm_ctx);
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struct dma_resv *pvr_vm_get_dma_resv(struct pvr_vm_context *vm_ctx);
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int pvr_static_data_areas_get(const struct pvr_device *pvr_dev,
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struct drm_pvr_ioctl_dev_query_args *args);
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int pvr_heap_info_get(const struct pvr_device *pvr_dev,
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struct drm_pvr_ioctl_dev_query_args *args);
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const struct drm_pvr_heap *pvr_find_heap_containing(struct pvr_device *pvr_dev,
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u64 addr, u64 size);
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struct pvr_gem_object *pvr_vm_find_gem_object(struct pvr_vm_context *vm_ctx,
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u64 device_addr,
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u64 *mapped_offset_out,
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u64 *mapped_size_out);
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struct pvr_fw_object *
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pvr_vm_get_fw_mem_context(struct pvr_vm_context *vm_ctx);
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struct pvr_vm_context *pvr_vm_context_lookup(struct pvr_file *pvr_file, u32 handle);
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struct pvr_vm_context *pvr_vm_context_get(struct pvr_vm_context *vm_ctx);
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bool pvr_vm_context_put(struct pvr_vm_context *vm_ctx);
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void pvr_destroy_vm_contexts_for_file(struct pvr_file *pvr_file);
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#endif /* PVR_VM_H */
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