On Tue, Sep 12, 2017 at 7:05 PM, Felix Kuehling <Felix.Kuehling at amd.com> wrote:
> Allows assigning a PASID to a VM for identifying VMs involved in page
> faults. The global PASID manager is also exported in the KFD
> interface so that AMDGPU and KFD can share the PASID space.
>
> PASIDs of different sizes can be requested. On APUs, the PASID size
> is deterined by the capabilities of the IOMMU. So KFD must be able
> to allocate PASIDs in a smaller range.
>
> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
Acked-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c | 2 +
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c | 2 +
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 75 ++++++++++++++++++++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 14 ++++-
> drivers/gpu/drm/amd/include/kgd_kfd_interface.h | 6 ++
> 6 files changed, 97 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
> index b9dbbf9..dc7e25c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
> @@ -169,6 +169,8 @@ static const struct kfd2kgd_calls kfd2kgd = {
> .get_vmem_size = get_vmem_size,
> .get_gpu_clock_counter = get_gpu_clock_counter,
> .get_max_engine_clock_in_mhz = get_max_engine_clock_in_mhz,
> + .alloc_pasid = amdgpu_vm_alloc_pasid,
> + .free_pasid = amdgpu_vm_free_pasid,
> .program_sh_mem_settings = kgd_program_sh_mem_settings,
> .set_pasid_vmid_mapping = kgd_set_pasid_vmid_mapping,
> .init_pipeline = kgd_init_pipeline,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
> index 309f241..c678c69 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
> @@ -128,6 +128,8 @@ static const struct kfd2kgd_calls kfd2kgd = {
> .get_vmem_size = get_vmem_size,
> .get_gpu_clock_counter = get_gpu_clock_counter,
> .get_max_engine_clock_in_mhz = get_max_engine_clock_in_mhz,
> + .alloc_pasid = amdgpu_vm_alloc_pasid,
> + .free_pasid = amdgpu_vm_free_pasid,
> .program_sh_mem_settings = kgd_program_sh_mem_settings,
> .set_pasid_vmid_mapping = kgd_set_pasid_vmid_mapping,
> .init_pipeline = kgd_init_pipeline,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index d31777b..7045eec 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -825,7 +825,7 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
> }
>
> r = amdgpu_vm_init(adev, &fpriv->vm,
> - AMDGPU_VM_CONTEXT_GFX);
> + AMDGPU_VM_CONTEXT_GFX, 0);
> if (r) {
> kfree(fpriv);
> goto out_suspend;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 87858f6..bdb9fe8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -27,12 +27,59 @@
> */
> #include <linux/dma-fence-array.h>
> #include <linux/interval_tree_generic.h>
> +#include <linux/idr.h>
> #include <drm/drmP.h>
> #include <drm/amdgpu_drm.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_vm_pasid_ida);
> +
> +/**
> + * amdgpu_vm_alloc_pasid - 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_vm_alloc_pasid(unsigned int bits)
> +{
> + int pasid = -EINVAL;
> +
> + for (bits = min(bits, 31U); bits > 0; bits--) {
> + pasid = ida_simple_get(&amdgpu_vm_pasid_ida,
> + 1U << (bits - 1), 1U << bits,
> + GFP_KERNEL);
> + if (pasid != -ENOSPC)
> + break;
> + }
> +
> + return pasid;
> +}
> +
> +/**
> + * amdgpu_vm_free_pasid - Free a PASID
> + * @pasid: PASID to free
> + */
> +void amdgpu_vm_free_pasid(unsigned int pasid)
> +{
> + ida_simple_remove(&amdgpu_vm_pasid_ida, pasid);
> +}
> +
> +/*
> * GPUVM
> * GPUVM is similar to the legacy gart on older asics, however
> * rather than there being a single global gart table
> @@ -2543,7 +2590,7 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint64_t vm_size, uint32_
> * Init @vm fields.
> */
> int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> - int vm_context)
> + int vm_context, unsigned int pasid)
> {
> const unsigned align = min(AMDGPU_VM_PTB_ALIGN_SIZE,
> AMDGPU_VM_PTE_COUNT(adev) * 8);
> @@ -2624,6 +2671,19 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> goto error_free_root;
> }
>
> + if (pasid) {
> + unsigned long flags;
> +
> + spin_lock_irqsave(&adev->vm_manager.pasid_lock, flags);
> + r = idr_alloc(&adev->vm_manager.pasid_idr, vm, pasid, pasid + 1,
> + GFP_ATOMIC);
> + spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
> + if (r < 0)
> + goto error_free_root;
> +
> + vm->pasid = pasid;
> + }
> +
> return 0;
>
> error_free_root:
> @@ -2677,6 +2737,14 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
> bool prt_fini_needed = !!adev->gart.gart_funcs->set_prt;
> int i;
>
> + if (vm->pasid) {
> + unsigned long flags;
> +
> + spin_lock_irqsave(&adev->vm_manager.pasid_lock, flags);
> + idr_remove(&adev->vm_manager.pasid_idr, vm->pasid);
> + spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
> + }
> +
> amd_sched_entity_fini(vm->entity.sched, &vm->entity);
>
> if (!RB_EMPTY_ROOT(&vm->va)) {
> @@ -2756,6 +2824,8 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
> adev->vm_manager.vm_update_mode = 0;
> #endif
>
> + idr_init(&adev->vm_manager.pasid_idr);
> + spin_lock_init(&adev->vm_manager.pasid_lock);
> }
>
> /**
> @@ -2769,6 +2839,9 @@ void amdgpu_vm_manager_fini(struct amdgpu_device *adev)
> {
> unsigned i, j;
>
> + WARN_ON(!idr_is_empty(&adev->vm_manager.pasid_idr));
> + idr_destroy(&adev->vm_manager.pasid_idr);
> +
> for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
> struct amdgpu_vm_id_manager *id_mgr =
> &adev->vm_manager.id_mgr[i];
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index cb6a622..dab466d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -25,6 +25,7 @@
> #define __AMDGPU_VM_H__
>
> #include <linux/rbtree.h>
> +#include <linux/idr.h>
>
> #include "gpu_scheduler.h"
> #include "amdgpu_sync.h"
> @@ -148,8 +149,9 @@ struct amdgpu_vm {
> /* Scheduler entity for page table updates */
> struct amd_sched_entity entity;
>
> - /* client id */
> + /* client id and PASID (TODO: replace client_id with PASID) */
> u64 client_id;
> + unsigned int pasid;
> /* dedicated to vm */
> struct amdgpu_vm_id *reserved_vmid[AMDGPU_MAX_VMHUBS];
>
> @@ -220,12 +222,20 @@ struct amdgpu_vm_manager {
> * BIT1[= 0] Compute updated by SDMA [= 1] by CPU
> */
> int vm_update_mode;
> +
> + /* PASID to VM mapping, will be used in interrupt context to
> + * look up VM of a page fault
> + */
> + struct idr pasid_idr;
> + spinlock_t pasid_lock;
> };
>
> +int amdgpu_vm_alloc_pasid(unsigned int bits);
> +void amdgpu_vm_free_pasid(unsigned int pasid);
> void amdgpu_vm_manager_init(struct amdgpu_device *adev);
> void amdgpu_vm_manager_fini(struct amdgpu_device *adev);
> int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> - int vm_context);
> + int vm_context, unsigned int pasid);
> void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm);
> void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
> struct list_head *validated,
> diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
> index 94277cb..f516fd1 100644
> --- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
> +++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
> @@ -112,6 +112,9 @@ struct tile_config {
> *
> * @get_max_engine_clock_in_mhz: Retrieves maximum GPU clock in MHz
> *
> + * @alloc_pasid: Allocate a PASID
> + * @free_pasid: Free a PASID
> + *
> * @program_sh_mem_settings: A function that should initiate the memory
> * properties such as main aperture memory type (cache / non cached) and
> * secondary aperture base address, size and memory type.
> @@ -160,6 +163,9 @@ struct kfd2kgd_calls {
>
> uint32_t (*get_max_engine_clock_in_mhz)(struct kgd_dev *kgd);
>
> + int (*alloc_pasid)(unsigned int bits);
> + void (*free_pasid)(unsigned int pasid);
> +
> /* Register access functions */
> void (*program_sh_mem_settings)(struct kgd_dev *kgd, uint32_t vmid,
> uint32_t sh_mem_config, uint32_t sh_mem_ape1_base,
> --
> 2.7.4
>
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> amd-gfx at lists.freedesktop.org
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