amdgpu_ids.c | Explore in Territory

/*
 * Copyright 2017 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */
#include "amdgpu_ids.h"

#include <linux/idr.h>
#include <linux/dma-fence-array.h>


#include "amdgpu.h"
#include "amdgpu_trace.h"

/*
 * PASID manager
 *
 * PASIDs are global address space identifiers that can be shared
 * between the GPU, an IOMMU and the driver. VMs on different devices
 * may use the same PASID if they share the same address
 * space. Therefore PASIDs are allocated using a global IDA. VMs are
 * looked up from the PASID per amdgpu_device.
 */
static DEFINE_IDA(amdgpu_pasid_ida);

/* Helper to free pasid from a fence callback */
struct amdgpu_pasid_cb { … };

/**
 * amdgpu_pasid_alloc - Allocate a PASID
 * @bits: Maximum width of the PASID in bits, must be at least 1
 *
 * Allocates a PASID of the given width while keeping smaller PASIDs
 * available if possible.
 *
 * Returns a positive integer on success. Returns %-EINVAL if bits==0.
 * Returns %-ENOSPC if no PASID was available. Returns %-ENOMEM on
 * memory allocation failure.
 */
int amdgpu_pasid_alloc(unsigned int bits)
{ … }

/**
 * amdgpu_pasid_free - Free a PASID
 * @pasid: PASID to free
 */
void amdgpu_pasid_free(u32 pasid)
{ … }

static void amdgpu_pasid_free_cb(struct dma_fence *fence,
				 struct dma_fence_cb *_cb)
{ … }

/**
 * amdgpu_pasid_free_delayed - free pasid when fences signal
 *
 * @resv: reservation object with the fences to wait for
 * @pasid: pasid to free
 *
 * Free the pasid only after all the fences in resv are signaled.
 */
void amdgpu_pasid_free_delayed(struct dma_resv *resv,
			       u32 pasid)
{ … }

/*
 * VMID manager
 *
 * VMIDs are a per VMHUB identifier for page tables handling.
 */

/**
 * amdgpu_vmid_had_gpu_reset - check if reset occured since last use
 *
 * @adev: amdgpu_device pointer
 * @id: VMID structure
 *
 * Check if GPU reset occured since last use of the VMID.
 */
bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
			       struct amdgpu_vmid *id)
{ … }

/* Check if we need to switch to another set of resources */
static bool amdgpu_vmid_gds_switch_needed(struct amdgpu_vmid *id,
					  struct amdgpu_job *job)
{ … }

/* Check if the id is compatible with the job */
static bool amdgpu_vmid_compatible(struct amdgpu_vmid *id,
				   struct amdgpu_job *job)
{ … }

/**
 * amdgpu_vmid_grab_idle - grab idle VMID
 *
 * @ring: ring we want to submit job to
 * @idle: resulting idle VMID
 * @fence: fence to wait for if no id could be grabbed
 *
 * Try to find an idle VMID, if none is idle add a fence to wait to the sync
 * object. Returns -ENOMEM when we are out of memory.
 */
static int amdgpu_vmid_grab_idle(struct amdgpu_ring *ring,
				 struct amdgpu_vmid **idle,
				 struct dma_fence **fence)
{ … }

/**
 * amdgpu_vmid_grab_reserved - try to assign reserved VMID
 *
 * @vm: vm to allocate id for
 * @ring: ring we want to submit job to
 * @job: job who wants to use the VMID
 * @id: resulting VMID
 * @fence: fence to wait for if no id could be grabbed
 *
 * Try to assign a reserved VMID.
 */
static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
				     struct amdgpu_ring *ring,
				     struct amdgpu_job *job,
				     struct amdgpu_vmid **id,
				     struct dma_fence **fence)
{ … }

/**
 * amdgpu_vmid_grab_used - try to reuse a VMID
 *
 * @vm: vm to allocate id for
 * @ring: ring we want to submit job to
 * @job: job who wants to use the VMID
 * @id: resulting VMID
 * @fence: fence to wait for if no id could be grabbed
 *
 * Try to reuse a VMID for this submission.
 */
static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
				 struct amdgpu_ring *ring,
				 struct amdgpu_job *job,
				 struct amdgpu_vmid **id,
				 struct dma_fence **fence)
{ … }

/**
 * amdgpu_vmid_grab - allocate the next free VMID
 *
 * @vm: vm to allocate id for
 * @ring: ring we want to submit job to
 * @job: job who wants to use the VMID
 * @fence: fence to wait for if no id could be grabbed
 *
 * Allocate an id for the vm, adding fences to the sync obj as necessary.
 */
int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
		     struct amdgpu_job *job, struct dma_fence **fence)
{ … }

/*
 * amdgpu_vmid_uses_reserved - check if a VM will use a reserved VMID
 * @vm: the VM to check
 * @vmhub: the VMHUB which will be used
 *
 * Returns: True if the VM will use a reserved VMID.
 */
bool amdgpu_vmid_uses_reserved(struct amdgpu_vm *vm, unsigned int vmhub)
{ … }

int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
			       unsigned vmhub)
{ … }

void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
			       unsigned vmhub)
{ … }

/**
 * amdgpu_vmid_reset - reset VMID to zero
 *
 * @adev: amdgpu device structure
 * @vmhub: vmhub type
 * @vmid: vmid number to use
 *
 * Reset saved GDW, GWS and OA to force switch on next flush.
 */
void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
		       unsigned vmid)
{ … }

/**
 * amdgpu_vmid_reset_all - reset VMID to zero
 *
 * @adev: amdgpu device structure
 *
 * Reset VMID to force flush on next use
 */
void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
{ … }

/**
 * amdgpu_vmid_mgr_init - init the VMID manager
 *
 * @adev: amdgpu_device pointer
 *
 * Initialize the VM manager structures
 */
void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
{ … }

/**
 * amdgpu_vmid_mgr_fini - cleanup VM manager
 *
 * @adev: amdgpu_device pointer
 *
 * Cleanup the VM manager and free resources.
 */
void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
{ … }
linux/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
