Re: [PATCH 1/5] drm/radeon: separate gart and vm functions

On Thu, Feb 20, 2014 at 3:20 PM, Christian König deathsimple@vodafone.de wrote:

From: Christian König christian.koenig@amd.com

Both are complex enough on their own.

Signed-off-by: Christian König christian.koenig@amd.com

For the series:

Reviewed-by: Alex Deucher alexander.deucher@amd.com

---

drivers/gpu/drm/radeon/Makefile | 2 +- drivers/gpu/drm/radeon/radeon_gart.c | 958 ---------------------------------- drivers/gpu/drm/radeon/radeon_vm.c | 981 +++++++++++++++++++++++++++++++++++ 3 files changed, 982 insertions(+), 959 deletions(-) create mode 100644 drivers/gpu/drm/radeon/radeon_vm.c

diff --git a/drivers/gpu/drm/radeon/Makefile b/drivers/gpu/drm/radeon/Makefile index ed60caa..0943353 100644 --- a/drivers/gpu/drm/radeon/Makefile +++ b/drivers/gpu/drm/radeon/Makefile @@ -80,7 +80,7 @@ radeon-y += radeon_device.o radeon_asic.o radeon_kms.o \ r600_dpm.o rs780_dpm.o rv6xx_dpm.o rv770_dpm.o rv730_dpm.o rv740_dpm.o \ rv770_smc.o cypress_dpm.o btc_dpm.o sumo_dpm.o sumo_smc.o trinity_dpm.o \ trinity_smc.o ni_dpm.o si_smc.o si_dpm.o kv_smc.o kv_dpm.o ci_smc.o \

•   ci_dpm.o dce6_afmt.o
  

•   ci_dpm.o dce6_afmt.o radeon_vm.o
  
  

# add async DMA block radeon-y += \ diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index a8f9b46..2e72365 100644 --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -28,8 +28,6 @@ #include <drm/drmP.h> #include <drm/radeon_drm.h> #include "radeon.h" -#include "radeon_reg.h" -#include "radeon_trace.h"

/*

• GART

@@ -394,959 +392,3 @@ void radeon_gart_fini(struct radeon_device *rdev)

    radeon_dummy_page_fini(rdev);

}

-/*

• • GPUVM
• • GPUVM is similar to the legacy gart on older asics, however
• • rather than there being a single global gart table
• • for the entire GPU, there are multiple VM page tables active
• • at any given time. The VM page tables can contain a mix
• • vram pages and system memory pages and system memory pages
• • can be mapped as snooped (cached system pages) or unsnooped
• • (uncached system pages).
• • Each VM has an ID associated with it and there is a page table
• • associated with each VMID. When execting a command buffer,
• • the kernel tells the the ring what VMID to use for that command
• • buffer. VMIDs are allocated dynamically as commands are submitted.
• • The userspace drivers maintain their own address space and the kernel
• • sets up their pages tables accordingly when they submit their
• • command buffers and a VMID is assigned.
• • Cayman/Trinity support up to 8 active VMs at any given time;
• • SI supports 16.
• */

-/*

• • vm helpers
• • TODO bind a default page at vm initialization for default address
• */

-/**

• • radeon_vm_num_pde - return the number of page directory entries
• • @rdev: radeon_device pointer
• • Calculate the number of page directory entries (cayman+).
• */

-static unsigned radeon_vm_num_pdes(struct radeon_device *rdev) -{

•   return rdev->vm_manager.max_pfn >> RADEON_VM_BLOCK_SIZE;
  

-}

-/**

• • radeon_vm_directory_size - returns the size of the page directory in bytes
• • @rdev: radeon_device pointer
• • Calculate the size of the page directory in bytes (cayman+).
• */

-static unsigned radeon_vm_directory_size(struct radeon_device *rdev) -{

•   return RADEON_GPU_PAGE_ALIGN(radeon_vm_num_pdes(rdev) * 8);
  

-}

-/**

• • radeon_vm_manager_init - init the vm manager
• • @rdev: radeon_device pointer
• • Init the vm manager (cayman+).
• • Returns 0 for success, error for failure.
• */

-int radeon_vm_manager_init(struct radeon_device *rdev) -{

•   struct radeon_vm *vm;
  

•   struct radeon_bo_va *bo_va;
  

•   int r;
  

•   unsigned size;
  

•   if (!rdev->vm_manager.enabled) {
  

•           /* allocate enough for 2 full VM pts */
  

•           size = radeon_vm_directory_size(rdev);
  

•           size += rdev->vm_manager.max_pfn * 8;
  

•           size *= 2;
  

•           r = radeon_sa_bo_manager_init(rdev, &rdev->vm_manager.sa_manager,
  

•                                         RADEON_GPU_PAGE_ALIGN(size),
  

•                                         RADEON_VM_PTB_ALIGN_SIZE,
  

•                                         RADEON_GEM_DOMAIN_VRAM);
  

•           if (r) {
  

•                   dev_err(rdev->dev, "failed to allocate vm bo (%dKB)\n",
  

•                           (rdev->vm_manager.max_pfn * 8) >> 10);
  

•                   return r;
  

•           }
  

•           r = radeon_asic_vm_init(rdev);
  

•           if (r)
  

•                   return r;
  

•           rdev->vm_manager.enabled = true;
  

•           r = radeon_sa_bo_manager_start(rdev, &rdev->vm_manager.sa_manager);
  

•           if (r)
  

•                   return r;
  

•   }
  

•   /* restore page table */
  

•   list_for_each_entry(vm, &rdev->vm_manager.lru_vm, list) {
  

•           if (vm->page_directory == NULL)
  

•                   continue;
  

•           list_for_each_entry(bo_va, &vm->va, vm_list) {
  

•                   bo_va->valid = false;
  

•           }
  

•   }
  

•   return 0;
  

-}

-/**

• • radeon_vm_free_pt - free the page table for a specific vm
• • @rdev: radeon_device pointer
• • @vm: vm to unbind
• • Free the page table of a specific vm (cayman+).
• • Global and local mutex must be lock!
• */

-static void radeon_vm_free_pt(struct radeon_device *rdev,

•                               struct radeon_vm *vm)
  

-{

•   struct radeon_bo_va *bo_va;
  

•   int i;
  

•   if (!vm->page_directory)
  

•           return;
  

•   list_del_init(&vm->list);
  

•   radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•   list_for_each_entry(bo_va, &vm->va, vm_list) {
  

•           bo_va->valid = false;
  

•   }
  

•   if (vm->page_tables == NULL)
  

•           return;
  

•   for (i = 0; i < radeon_vm_num_pdes(rdev); i++)
  

•           radeon_sa_bo_free(rdev, &vm->page_tables[i], vm->fence);
  

•   kfree(vm->page_tables);
  

-}

-/**

• • radeon_vm_manager_fini - tear down the vm manager
• • @rdev: radeon_device pointer
• • Tear down the VM manager (cayman+).
• */

-void radeon_vm_manager_fini(struct radeon_device *rdev) -{

•   struct radeon_vm *vm, *tmp;
  

•   int i;
  

•   if (!rdev->vm_manager.enabled)
  

•           return;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   /* free all allocated page tables */
  

•   list_for_each_entry_safe(vm, tmp, &rdev->vm_manager.lru_vm, list) {
  

•           mutex_lock(&vm->mutex);
  

•           radeon_vm_free_pt(rdev, vm);
  

•           mutex_unlock(&vm->mutex);
  

•   }
  

•   for (i = 0; i < RADEON_NUM_VM; ++i) {
  

•           radeon_fence_unref(&rdev->vm_manager.active[i]);
  

•   }
  

•   radeon_asic_vm_fini(rdev);
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   radeon_sa_bo_manager_suspend(rdev, &rdev->vm_manager.sa_manager);
  

•   radeon_sa_bo_manager_fini(rdev, &rdev->vm_manager.sa_manager);
  

•   rdev->vm_manager.enabled = false;
  

-}

-/**

• • radeon_vm_evict - evict page table to make room for new one
• • @rdev: radeon_device pointer
• • @vm: VM we want to allocate something for
• • Evict a VM from the lru, making sure that it isn't @vm. (cayman+).
• • Returns 0 for success, -ENOMEM for failure.
• • Global and local mutex must be locked!
• */

-static int radeon_vm_evict(struct radeon_device *rdev, struct radeon_vm *vm) -{

•   struct radeon_vm *vm_evict;
  

•   if (list_empty(&rdev->vm_manager.lru_vm))
  

•           return -ENOMEM;
  

•   vm_evict = list_first_entry(&rdev->vm_manager.lru_vm,
  

•                               struct radeon_vm, list);
  

•   if (vm_evict == vm)
  

•           return -ENOMEM;
  

•   mutex_lock(&vm_evict->mutex);
  

•   radeon_vm_free_pt(rdev, vm_evict);
  

•   mutex_unlock(&vm_evict->mutex);
  

•   return 0;
  

-}

-/**

• • radeon_vm_alloc_pt - allocates a page table for a VM
• • @rdev: radeon_device pointer
• • @vm: vm to bind
• • Allocate a page table for the requested vm (cayman+).
• • Returns 0 for success, error for failure.
• • Global and local mutex must be locked!
• */

-int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm) -{

•   unsigned pd_size, pd_entries, pts_size;
  

•   struct radeon_ib ib;
  

•   int r;
  

•   if (vm == NULL) {
  

•           return -EINVAL;
  

•   }
  

•   if (vm->page_directory != NULL) {
  

•           return 0;
  

•   }
  

•   pd_size = radeon_vm_directory_size(rdev);
  

•   pd_entries = radeon_vm_num_pdes(rdev);
  

-retry:

•   r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
  

•                        &vm->page_directory, pd_size,
  

•                        RADEON_VM_PTB_ALIGN_SIZE, false);
  

•   if (r == -ENOMEM) {
  

•           r = radeon_vm_evict(rdev, vm);
  

•           if (r)
  

•                   return r;
  

•           goto retry;
  

•   } else if (r) {
  

•           return r;
  

•   }
  

•   vm->pd_gpu_addr = radeon_sa_bo_gpu_addr(vm->page_directory);
  

•   /* Initially clear the page directory */
  

•   r = radeon_ib_get(rdev, R600_RING_TYPE_DMA_INDEX, &ib,
  

•                     NULL, pd_entries * 2 + 64);
  

•   if (r) {
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return r;
  

•   }
  

•   ib.length_dw = 0;
  

•   radeon_asic_vm_set_page(rdev, &ib, vm->pd_gpu_addr,
  

•                           0, pd_entries, 0, 0);
  

•   radeon_semaphore_sync_to(ib.semaphore, vm->fence);
  

•   r = radeon_ib_schedule(rdev, &ib, NULL);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return r;
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(ib.fence);
  

•   radeon_ib_free(rdev, &ib);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   /* allocate page table array */
  

•   pts_size = radeon_vm_num_pdes(rdev) * sizeof(struct radeon_sa_bo *);
  

•   vm->page_tables = kzalloc(pts_size, GFP_KERNEL);
  

•   if (vm->page_tables == NULL) {
  

•           DRM_ERROR("Cannot allocate memory for page table array\n");
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return -ENOMEM;
  

•   }
  

•   return 0;
  

-}

-/**

• • radeon_vm_add_to_lru - add VMs page table to LRU list
• • @rdev: radeon_device pointer
• • @vm: vm to add to LRU
• • Add the allocated page table to the LRU list (cayman+).
• • Global mutex must be locked!
• */

-void radeon_vm_add_to_lru(struct radeon_device *rdev, struct radeon_vm *vm) -{

•   list_del_init(&vm->list);
  

•   list_add_tail(&vm->list, &rdev->vm_manager.lru_vm);
  

-}

-/**

• • radeon_vm_grab_id - allocate the next free VMID
• • @rdev: radeon_device pointer
• • @vm: vm to allocate id for
• • @ring: ring we want to submit job to
• • Allocate an id for the vm (cayman+).
• • Returns the fence we need to sync to (if any).
• • Global and local mutex must be locked!
• */

-struct radeon_fence *radeon_vm_grab_id(struct radeon_device *rdev,

•                                  struct radeon_vm *vm, int ring)
  

-{

•   struct radeon_fence *best[RADEON_NUM_RINGS] = {};
  

•   unsigned choices[2] = {};
  

•   unsigned i;
  

•   /* check if the id is still valid */
  

•   if (vm->last_id_use && vm->last_id_use == rdev->vm_manager.active[vm->id])
  

•           return NULL;
  

•   /* we definately need to flush */
  

•   radeon_fence_unref(&vm->last_flush);
  

•   /* skip over VMID 0, since it is the system VM */
  

•   for (i = 1; i < rdev->vm_manager.nvm; ++i) {
  

•           struct radeon_fence *fence = rdev->vm_manager.active[i];
  

•           if (fence == NULL) {
  

•                   /* found a free one */
  

•                   vm->id = i;
  

•                   trace_radeon_vm_grab_id(vm->id, ring);
  

•                   return NULL;
  

•           }
  

•           if (radeon_fence_is_earlier(fence, best[fence->ring])) {
  

•                   best[fence->ring] = fence;
  

•                   choices[fence->ring == ring ? 0 : 1] = i;
  

•           }
  

•   }
  

•   for (i = 0; i < 2; ++i) {
  

•           if (choices[i]) {
  

•                   vm->id = choices[i];
  

•                   trace_radeon_vm_grab_id(vm->id, ring);
  

•                   return rdev->vm_manager.active[choices[i]];
  

•           }
  

•   }
  

•   /* should never happen */
  

•   BUG();
  

•   return NULL;
  

-}

-/**

• • radeon_vm_fence - remember fence for vm
• • @rdev: radeon_device pointer
• • @vm: vm we want to fence
• • @fence: fence to remember
• • Fence the vm (cayman+).
• • Set the fence used to protect page table and id.
• • Global and local mutex must be locked!
• */

-void radeon_vm_fence(struct radeon_device *rdev,

•                struct radeon_vm *vm,
  

•                struct radeon_fence *fence)
  

-{

•   radeon_fence_unref(&rdev->vm_manager.active[vm->id]);
  

•   rdev->vm_manager.active[vm->id] = radeon_fence_ref(fence);
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(fence);
  

•   radeon_fence_unref(&vm->last_id_use);
  

•   vm->last_id_use = radeon_fence_ref(fence);
  

-}

-/**

• • radeon_vm_bo_find - find the bo_va for a specific vm & bo
• • @vm: requested vm
• • @bo: requested buffer object
• • Find @bo inside the requested vm (cayman+).
• • Search inside the @bos vm list for the requested vm
• • Returns the found bo_va or NULL if none is found
• • Object has to be reserved!
• */

-struct radeon_bo_va *radeon_vm_bo_find(struct radeon_vm *vm,

•                                  struct radeon_bo *bo)
  

-{

•   struct radeon_bo_va *bo_va;
  

•   list_for_each_entry(bo_va, &bo->va, bo_list) {
  

•           if (bo_va->vm == vm) {
  

•                   return bo_va;
  

•           }
  

•   }
  

•   return NULL;
  

-}

-/**

• • radeon_vm_bo_add - add a bo to a specific vm
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • Add @bo into the requested vm (cayman+).
• • Add @bo to the list of bos associated with the vm
• • Returns newly added bo_va or NULL for failure
• • Object has to be reserved!
• */

-struct radeon_bo_va *radeon_vm_bo_add(struct radeon_device *rdev,

•                                 struct radeon_vm *vm,
  

•                                 struct radeon_bo *bo)
  

-{

•   struct radeon_bo_va *bo_va;
  

•   bo_va = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
  

•   if (bo_va == NULL) {
  

•           return NULL;
  

•   }
  

•   bo_va->vm = vm;
  

•   bo_va->bo = bo;
  

•   bo_va->soffset = 0;
  

•   bo_va->eoffset = 0;
  

•   bo_va->flags = 0;
  

•   bo_va->valid = false;
  

•   bo_va->ref_count = 1;
  

•   INIT_LIST_HEAD(&bo_va->bo_list);
  

•   INIT_LIST_HEAD(&bo_va->vm_list);
  

•   mutex_lock(&vm->mutex);
  

•   list_add(&bo_va->vm_list, &vm->va);
  

•   list_add_tail(&bo_va->bo_list, &bo->va);
  

•   mutex_unlock(&vm->mutex);
  

•   return bo_va;
  

-}

-/**

• • radeon_vm_bo_set_addr - set bos virtual address inside a vm
• • @rdev: radeon_device pointer
• • @bo_va: bo_va to store the address
• • @soffset: requested offset of the buffer in the VM address space
• • @flags: attributes of pages (read/write/valid/etc.)
• • Set offset of @bo_va (cayman+).
• • Validate and set the offset requested within the vm address space.
• • Returns 0 for success, error for failure.
• • Object has to be reserved!
• */

-int radeon_vm_bo_set_addr(struct radeon_device *rdev,

•                     struct radeon_bo_va *bo_va,
  

•                     uint64_t soffset,
  

•                     uint32_t flags)
  

-{

•   uint64_t size = radeon_bo_size(bo_va->bo);
  

•   uint64_t eoffset, last_offset = 0;
  

•   struct radeon_vm *vm = bo_va->vm;
  

•   struct radeon_bo_va *tmp;
  

•   struct list_head *head;
  

•   unsigned last_pfn;
  

•   if (soffset) {
  

•           /* make sure object fit at this offset */
  

•           eoffset = soffset + size;
  

•           if (soffset >= eoffset) {
  

•                   return -EINVAL;
  

•           }
  

•           last_pfn = eoffset / RADEON_GPU_PAGE_SIZE;
  

•           if (last_pfn > rdev->vm_manager.max_pfn) {
  

•                   dev_err(rdev->dev, "va above limit (0x%08X > 0x%08X)\n",
  

•                           last_pfn, rdev->vm_manager.max_pfn);
  

•                   return -EINVAL;
  

•           }
  

•   } else {
  

•           eoffset = last_pfn = 0;
  

•   }
  

•   mutex_lock(&vm->mutex);
  

•   head = &vm->va;
  

•   last_offset = 0;
  

•   list_for_each_entry(tmp, &vm->va, vm_list) {
  

•           if (bo_va == tmp) {
  

•                   /* skip over currently modified bo */
  

•                   continue;
  

•           }
  

•           if (soffset >= last_offset && eoffset <= tmp->soffset) {
  

•                   /* bo can be added before this one */
  

•                   break;
  

•           }
  

•           if (eoffset > tmp->soffset && soffset < tmp->eoffset) {
  

•                   /* bo and tmp overlap, invalid offset */
  

•                   dev_err(rdev->dev, "bo %p va 0x%08X conflict with (bo %p 0x%08X 0x%08X)\n",
  

•                           bo_va->bo, (unsigned)bo_va->soffset, tmp->bo,
  

•                           (unsigned)tmp->soffset, (unsigned)tmp->eoffset);
  

•                   mutex_unlock(&vm->mutex);
  

•                   return -EINVAL;
  

•           }
  

•           last_offset = tmp->eoffset;
  

•           head = &tmp->vm_list;
  

•   }
  

•   bo_va->soffset = soffset;
  

•   bo_va->eoffset = eoffset;
  

•   bo_va->flags = flags;
  

•   bo_va->valid = false;
  

•   list_move(&bo_va->vm_list, head);
  

•   mutex_unlock(&vm->mutex);
  

•   return 0;
  

-}

-/**

• • radeon_vm_map_gart - get the physical address of a gart page
• • @rdev: radeon_device pointer
• • @addr: the unmapped addr
• • Look up the physical address of the page that the pte resolves
• • to (cayman+).
• • Returns the physical address of the page.
• */

-uint64_t radeon_vm_map_gart(struct radeon_device *rdev, uint64_t addr) -{

•   uint64_t result;
  

•   /* page table offset */
  

•   result = rdev->gart.pages_addr[addr >> PAGE_SHIFT];
  

•   /* in case cpu page size != gpu page size*/
  

•   result |= addr & (~PAGE_MASK);
  

•   return result;
  

-}

-/**

• • radeon_vm_page_flags - translate page flags to what the hw uses
• • @flags: flags comming from userspace
• • Translate the flags the userspace ABI uses to hw flags.
• */

-static uint32_t radeon_vm_page_flags(uint32_t flags) -{

•    uint32_t hw_flags = 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_VALID) ? R600_PTE_VALID : 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_READABLE) ? R600_PTE_READABLE : 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_WRITEABLE) ? R600_PTE_WRITEABLE : 0;
  

•    if (flags & RADEON_VM_PAGE_SYSTEM) {
  

•            hw_flags |= R600_PTE_SYSTEM;
  

•            hw_flags |= (flags & RADEON_VM_PAGE_SNOOPED) ? R600_PTE_SNOOPED : 0;
  

•    }
  

•    return hw_flags;
  

-}

-/**

• • radeon_vm_update_pdes - make sure that page directory is valid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @start: start of GPU address range
• • @end: end of GPU address range
• • Allocates new page tables if necessary
• • and updates the page directory (cayman+).
• • Returns 0 for success, error for failure.
• • Global and local mutex must be locked!
• */

-static int radeon_vm_update_pdes(struct radeon_device *rdev,

•                            struct radeon_vm *vm,
  

•                            struct radeon_ib *ib,
  

•                            uint64_t start, uint64_t end)
  

-{

•   static const uint32_t incr = RADEON_VM_PTE_COUNT * 8;
  

•   uint64_t last_pde = ~0, last_pt = ~0;
  

•   unsigned count = 0;
  

•   uint64_t pt_idx;
  

•   int r;
  

•   start = (start / RADEON_GPU_PAGE_SIZE) >> RADEON_VM_BLOCK_SIZE;
  

•   end = (end / RADEON_GPU_PAGE_SIZE) >> RADEON_VM_BLOCK_SIZE;
  

•   /* walk over the address space and update the page directory */
  

•   for (pt_idx = start; pt_idx <= end; ++pt_idx) {
  

•           uint64_t pde, pt;
  

•           if (vm->page_tables[pt_idx])
  

•                   continue;
  

-retry:

•           r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
  

•                                &vm->page_tables[pt_idx],
  

•                                RADEON_VM_PTE_COUNT * 8,
  

•                                RADEON_GPU_PAGE_SIZE, false);
  

•           if (r == -ENOMEM) {
  

•                   r = radeon_vm_evict(rdev, vm);
  

•                   if (r)
  

•                           return r;
  

•                   goto retry;
  

•           } else if (r) {
  

•                   return r;
  

•           }
  

•           pde = vm->pd_gpu_addr + pt_idx * 8;
  

•           pt = radeon_sa_bo_gpu_addr(vm->page_tables[pt_idx]);
  

•           if (((last_pde + 8 * count) != pde) ||
  

•               ((last_pt + incr * count) != pt)) {
  

•                   if (count) {
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pde,
  

•                                                   last_pt, count, incr,
  

•                                                   R600_PTE_VALID);
  

•                           count *= RADEON_VM_PTE_COUNT;
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pt, 0,
  

•                                                   count, 0, 0);
  

•                   }
  

•                   count = 1;
  

•                   last_pde = pde;
  

•                   last_pt = pt;
  

•           } else {
  

•                   ++count;
  

•           }
  

•   }
  

•   if (count) {
  

•           radeon_asic_vm_set_page(rdev, ib, last_pde, last_pt, count,
  

•                                   incr, R600_PTE_VALID);
  

•           count *= RADEON_VM_PTE_COUNT;
  

•           radeon_asic_vm_set_page(rdev, ib, last_pt, 0,
  

•                                   count, 0, 0);
  

•   }
  

•   return 0;
  

-}

-/**

• • radeon_vm_update_ptes - make sure that page tables are valid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @start: start of GPU address range
• • @end: end of GPU address range
• • @dst: destination address to map to
• • @flags: mapping flags
• • Update the page tables in the range @start - @end (cayman+).
• • Global and local mutex must be locked!
• */

-static void radeon_vm_update_ptes(struct radeon_device *rdev,

•                             struct radeon_vm *vm,
  

•                             struct radeon_ib *ib,
  

•                             uint64_t start, uint64_t end,
  

•                             uint64_t dst, uint32_t flags)
  

-{

•   static const uint64_t mask = RADEON_VM_PTE_COUNT - 1;
  

•   uint64_t last_pte = ~0, last_dst = ~0;
  

•   unsigned count = 0;
  

•   uint64_t addr;
  

•   start = start / RADEON_GPU_PAGE_SIZE;
  

•   end = end / RADEON_GPU_PAGE_SIZE;
  

•   /* walk over the address space and update the page tables */
  

•   for (addr = start; addr < end; ) {
  

•           uint64_t pt_idx = addr >> RADEON_VM_BLOCK_SIZE;
  

•           unsigned nptes;
  

•           uint64_t pte;
  

•           if ((addr & ~mask) == (end & ~mask))
  

•                   nptes = end - addr;
  

•           else
  

•                   nptes = RADEON_VM_PTE_COUNT - (addr & mask);
  

•           pte = radeon_sa_bo_gpu_addr(vm->page_tables[pt_idx]);
  

•           pte += (addr & mask) * 8;
  

•           if ((last_pte + 8 * count) != pte) {
  

•                   if (count) {
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pte,
  

•                                                   last_dst, count,
  

•                                                   RADEON_GPU_PAGE_SIZE,
  

•                                                   flags);
  

•                   }
  

•                   count = nptes;
  

•                   last_pte = pte;
  

•                   last_dst = dst;
  

•           } else {
  

•                   count += nptes;
  

•           }
  

•           addr += nptes;
  

•           dst += nptes * RADEON_GPU_PAGE_SIZE;
  

•   }
  

•   if (count) {
  

•           radeon_asic_vm_set_page(rdev, ib, last_pte,
  

•                                   last_dst, count,
  

•                                   RADEON_GPU_PAGE_SIZE, flags);
  

•   }
  

-}

-/**

• • radeon_vm_bo_update - map a bo into the vm page table
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • @mem: ttm mem
• • Fill in the page table entries for @bo (cayman+).
• • Returns 0 for success, -EINVAL for failure.
• • Object have to be reserved & global and local mutex must be locked!
• */

-int radeon_vm_bo_update(struct radeon_device *rdev,

•                   struct radeon_vm *vm,
  

•                   struct radeon_bo *bo,
  

•                   struct ttm_mem_reg *mem)
  

-{

•   struct radeon_ib ib;
  

•   struct radeon_bo_va *bo_va;
  

•   unsigned nptes, npdes, ndw;
  

•   uint64_t addr;
  

•   int r;
  

•   /* nothing to do if vm isn't bound */
  

•   if (vm->page_directory == NULL)
  

•           return 0;
  

•   bo_va = radeon_vm_bo_find(vm, bo);
  

•   if (bo_va == NULL) {
  

•           dev_err(rdev->dev, "bo %p not in vm %p\n", bo, vm);
  

•           return -EINVAL;
  

•   }
  

•   if (!bo_va->soffset) {
  

•           dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
  

•                   bo, vm);
  

•           return -EINVAL;
  

•   }
  

•   if ((bo_va->valid && mem) || (!bo_va->valid && mem == NULL))
  

•           return 0;
  

•   bo_va->flags &= ~RADEON_VM_PAGE_VALID;
  

•   bo_va->flags &= ~RADEON_VM_PAGE_SYSTEM;
  

•   if (mem) {
  

•           addr = mem->start << PAGE_SHIFT;
  

•           if (mem->mem_type != TTM_PL_SYSTEM) {
  

•                   bo_va->flags |= RADEON_VM_PAGE_VALID;
  

•                   bo_va->valid = true;
  

•           }
  

•           if (mem->mem_type == TTM_PL_TT) {
  

•                   bo_va->flags |= RADEON_VM_PAGE_SYSTEM;
  

•           } else {
  

•                   addr += rdev->vm_manager.vram_base_offset;
  

•           }
  

•   } else {
  

•           addr = 0;
  

•           bo_va->valid = false;
  

•   }
  

•   trace_radeon_vm_bo_update(bo_va);
  

•   nptes = radeon_bo_ngpu_pages(bo);
  

•   /* assume two extra pdes in case the mapping overlaps the borders */
  

•   npdes = (nptes >> RADEON_VM_BLOCK_SIZE) + 2;
  

•   /* padding, etc. */
  

•   ndw = 64;
  

•   if (RADEON_VM_BLOCK_SIZE > 11)
  

•           /* reserve space for one header for every 2k dwords */
  

•           ndw += (nptes >> 11) * 4;
  

•   else
  

•           /* reserve space for one header for
  

•               every (1 << BLOCK_SIZE) entries */
  

•           ndw += (nptes >> RADEON_VM_BLOCK_SIZE) * 4;
  

•   /* reserve space for pte addresses */
  

•   ndw += nptes * 2;
  

•   /* reserve space for one header for every 2k dwords */
  

•   ndw += (npdes >> 11) * 4;
  

•   /* reserve space for pde addresses */
  

•   ndw += npdes * 2;
  

•   /* reserve space for clearing new page tables */
  

•   ndw += npdes * 2 * RADEON_VM_PTE_COUNT;
  

•   /* update too big for an IB */
  

•   if (ndw > 0xfffff)
  

•           return -ENOMEM;
  

•   r = radeon_ib_get(rdev, R600_RING_TYPE_DMA_INDEX, &ib, NULL, ndw * 4);
  

•   if (r)
  

•           return r;
  

•   ib.length_dw = 0;
  

•   r = radeon_vm_update_pdes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           return r;
  

•   }
  

•   radeon_vm_update_ptes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset,
  

•                         addr, radeon_vm_page_flags(bo_va->flags));
  

•   radeon_semaphore_sync_to(ib.semaphore, vm->fence);
  

•   r = radeon_ib_schedule(rdev, &ib, NULL);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           return r;
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(ib.fence);
  

•   radeon_ib_free(rdev, &ib);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   return 0;
  

-}

-/**

• • radeon_vm_bo_rmv - remove a bo to a specific vm
• • @rdev: radeon_device pointer
• • @bo_va: requested bo_va
• • Remove @bo_va->bo from the requested vm (cayman+).
• • Remove @bo_va->bo from the list of bos associated with the bo_va->vm and
• • remove the ptes for @bo_va in the page table.
• • Returns 0 for success.
• • Object have to be reserved!
• */

-int radeon_vm_bo_rmv(struct radeon_device *rdev,

•                struct radeon_bo_va *bo_va)
  

-{

•   int r = 0;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   mutex_lock(&bo_va->vm->mutex);
  

•   if (bo_va->soffset) {
  

•           r = radeon_vm_bo_update(rdev, bo_va->vm, bo_va->bo, NULL);
  

•   }
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   list_del(&bo_va->vm_list);
  

•   mutex_unlock(&bo_va->vm->mutex);
  

•   list_del(&bo_va->bo_list);
  

•   kfree(bo_va);
  

•   return r;
  

-}

-/**

• • radeon_vm_bo_invalidate - mark the bo as invalid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • Mark @bo as invalid (cayman+).
• */

-void radeon_vm_bo_invalidate(struct radeon_device *rdev,

•                        struct radeon_bo *bo)
  

-{

•   struct radeon_bo_va *bo_va;
  

•   list_for_each_entry(bo_va, &bo->va, bo_list) {
  

•           bo_va->valid = false;
  

•   }
  

-}

-/**

• • radeon_vm_init - initialize a vm instance
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • Init @vm fields (cayman+).
• */

-void radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm) -{

•   vm->id = 0;
  

•   vm->fence = NULL;
  

•   vm->last_flush = NULL;
  

•   vm->last_id_use = NULL;
  

•   mutex_init(&vm->mutex);
  

•   INIT_LIST_HEAD(&vm->list);
  

•   INIT_LIST_HEAD(&vm->va);
  

-}

-/**

• • radeon_vm_fini - tear down a vm instance
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • Tear down @vm (cayman+).
• • Unbind the VM and remove all bos from the vm bo list
• */

-void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm) -{

•   struct radeon_bo_va *bo_va, *tmp;
  

•   int r;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   mutex_lock(&vm->mutex);
  

•   radeon_vm_free_pt(rdev, vm);
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   if (!list_empty(&vm->va)) {
  

•           dev_err(rdev->dev, "still active bo inside vm\n");
  

•   }
  

•   list_for_each_entry_safe(bo_va, tmp, &vm->va, vm_list) {
  

•           list_del_init(&bo_va->vm_list);
  

•           r = radeon_bo_reserve(bo_va->bo, false);
  

•           if (!r) {
  

•                   list_del_init(&bo_va->bo_list);
  

•                   radeon_bo_unreserve(bo_va->bo);
  

•                   kfree(bo_va);
  

•           }
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   radeon_fence_unref(&vm->last_id_use);
  

•   mutex_unlock(&vm->mutex);
  

-} diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c new file mode 100644 index 0000000..433b1eb --- /dev/null +++ b/drivers/gpu/drm/radeon/radeon_vm.c @@ -0,0 +1,981 @@ +/*

• • Copyright 2008 Advanced Micro Devices, Inc.
• • Copyright 2008 Red Hat Inc.
• • Copyright 2009 Jerome Glisse.
• • 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.
• • Authors: Dave Airlie

• •      Alex Deucher
    

• •      Jerome Glisse
    

• */

+#include <drm/drmP.h> +#include <drm/radeon_drm.h> +#include "radeon.h" +#include "radeon_trace.h"

+/*

• • GPUVM
• • GPUVM is similar to the legacy gart on older asics, however
• • rather than there being a single global gart table
• • for the entire GPU, there are multiple VM page tables active
• • at any given time. The VM page tables can contain a mix
• • vram pages and system memory pages and system memory pages
• • can be mapped as snooped (cached system pages) or unsnooped
• • (uncached system pages).
• • Each VM has an ID associated with it and there is a page table
• • associated with each VMID. When execting a command buffer,
• • the kernel tells the the ring what VMID to use for that command
• • buffer. VMIDs are allocated dynamically as commands are submitted.
• • The userspace drivers maintain their own address space and the kernel
• • sets up their pages tables accordingly when they submit their
• • command buffers and a VMID is assigned.
• • Cayman/Trinity support up to 8 active VMs at any given time;
• • SI supports 16.
• */

+/**

• • radeon_vm_num_pde - return the number of page directory entries
• • @rdev: radeon_device pointer
• • Calculate the number of page directory entries (cayman+).
• */

+static unsigned radeon_vm_num_pdes(struct radeon_device *rdev) +{

•   return rdev->vm_manager.max_pfn >> RADEON_VM_BLOCK_SIZE;
  

+}

+/**

• • radeon_vm_directory_size - returns the size of the page directory in bytes
• • @rdev: radeon_device pointer
• • Calculate the size of the page directory in bytes (cayman+).
• */

+static unsigned radeon_vm_directory_size(struct radeon_device *rdev) +{

•   return RADEON_GPU_PAGE_ALIGN(radeon_vm_num_pdes(rdev) * 8);
  

+}

+/**

• • radeon_vm_manager_init - init the vm manager
• • @rdev: radeon_device pointer
• • Init the vm manager (cayman+).
• • Returns 0 for success, error for failure.
• */

+int radeon_vm_manager_init(struct radeon_device *rdev) +{

•   struct radeon_vm *vm;
  

•   struct radeon_bo_va *bo_va;
  

•   int r;
  

•   unsigned size;
  

•   if (!rdev->vm_manager.enabled) {
  

•           /* allocate enough for 2 full VM pts */
  

•           size = radeon_vm_directory_size(rdev);
  

•           size += rdev->vm_manager.max_pfn * 8;
  

•           size *= 2;
  

•           r = radeon_sa_bo_manager_init(rdev, &rdev->vm_manager.sa_manager,
  

•                                         RADEON_GPU_PAGE_ALIGN(size),
  

•                                         RADEON_VM_PTB_ALIGN_SIZE,
  

•                                         RADEON_GEM_DOMAIN_VRAM);
  

•           if (r) {
  

•                   dev_err(rdev->dev, "failed to allocate vm bo (%dKB)\n",
  

•                           (rdev->vm_manager.max_pfn * 8) >> 10);
  

•                   return r;
  

•           }
  

•           r = radeon_asic_vm_init(rdev);
  

•           if (r)
  

•                   return r;
  

•           rdev->vm_manager.enabled = true;
  

•           r = radeon_sa_bo_manager_start(rdev, &rdev->vm_manager.sa_manager);
  

•           if (r)
  

•                   return r;
  

•   }
  

•   /* restore page table */
  

•   list_for_each_entry(vm, &rdev->vm_manager.lru_vm, list) {
  

•           if (vm->page_directory == NULL)
  

•                   continue;
  

•           list_for_each_entry(bo_va, &vm->va, vm_list) {
  

•                   bo_va->valid = false;
  

•           }
  

•   }
  

•   return 0;
  

+}

+/**

• • radeon_vm_free_pt - free the page table for a specific vm
• • @rdev: radeon_device pointer
• • @vm: vm to unbind
• • Free the page table of a specific vm (cayman+).
• • Global and local mutex must be lock!
• */

+static void radeon_vm_free_pt(struct radeon_device *rdev,

•                               struct radeon_vm *vm)
  

+{

•   struct radeon_bo_va *bo_va;
  

•   int i;
  

•   if (!vm->page_directory)
  

•           return;
  

•   list_del_init(&vm->list);
  

•   radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•   list_for_each_entry(bo_va, &vm->va, vm_list) {
  

•           bo_va->valid = false;
  

•   }
  

•   if (vm->page_tables == NULL)
  

•           return;
  

•   for (i = 0; i < radeon_vm_num_pdes(rdev); i++)
  

•           radeon_sa_bo_free(rdev, &vm->page_tables[i], vm->fence);
  

•   kfree(vm->page_tables);
  

+}

+/**

• • radeon_vm_manager_fini - tear down the vm manager
• • @rdev: radeon_device pointer
• • Tear down the VM manager (cayman+).
• */

+void radeon_vm_manager_fini(struct radeon_device *rdev) +{

•   struct radeon_vm *vm, *tmp;
  

•   int i;
  

•   if (!rdev->vm_manager.enabled)
  

•           return;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   /* free all allocated page tables */
  

•   list_for_each_entry_safe(vm, tmp, &rdev->vm_manager.lru_vm, list) {
  

•           mutex_lock(&vm->mutex);
  

•           radeon_vm_free_pt(rdev, vm);
  

•           mutex_unlock(&vm->mutex);
  

•   }
  

•   for (i = 0; i < RADEON_NUM_VM; ++i) {
  

•           radeon_fence_unref(&rdev->vm_manager.active[i]);
  

•   }
  

•   radeon_asic_vm_fini(rdev);
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   radeon_sa_bo_manager_suspend(rdev, &rdev->vm_manager.sa_manager);
  

•   radeon_sa_bo_manager_fini(rdev, &rdev->vm_manager.sa_manager);
  

•   rdev->vm_manager.enabled = false;
  

+}

+/**

• • radeon_vm_evict - evict page table to make room for new one
• • @rdev: radeon_device pointer
• • @vm: VM we want to allocate something for
• • Evict a VM from the lru, making sure that it isn't @vm. (cayman+).
• • Returns 0 for success, -ENOMEM for failure.
• • Global and local mutex must be locked!
• */

+static int radeon_vm_evict(struct radeon_device *rdev, struct radeon_vm *vm) +{

•   struct radeon_vm *vm_evict;
  

•   if (list_empty(&rdev->vm_manager.lru_vm))
  

•           return -ENOMEM;
  

•   vm_evict = list_first_entry(&rdev->vm_manager.lru_vm,
  

•                               struct radeon_vm, list);
  

•   if (vm_evict == vm)
  

•           return -ENOMEM;
  

•   mutex_lock(&vm_evict->mutex);
  

•   radeon_vm_free_pt(rdev, vm_evict);
  

•   mutex_unlock(&vm_evict->mutex);
  

•   return 0;
  

+}

+/**

• • radeon_vm_alloc_pt - allocates a page table for a VM
• • @rdev: radeon_device pointer
• • @vm: vm to bind
• • Allocate a page table for the requested vm (cayman+).
• • Returns 0 for success, error for failure.
• • Global and local mutex must be locked!
• */

+int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm) +{

•   unsigned pd_size, pd_entries, pts_size;
  

•   struct radeon_ib ib;
  

•   int r;
  

•   if (vm == NULL) {
  

•           return -EINVAL;
  

•   }
  

•   if (vm->page_directory != NULL) {
  

•           return 0;
  

•   }
  

•   pd_size = radeon_vm_directory_size(rdev);
  

•   pd_entries = radeon_vm_num_pdes(rdev);
  

+retry:

•   r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
  

•                        &vm->page_directory, pd_size,
  

•                        RADEON_VM_PTB_ALIGN_SIZE, false);
  

•   if (r == -ENOMEM) {
  

•           r = radeon_vm_evict(rdev, vm);
  

•           if (r)
  

•                   return r;
  

•           goto retry;
  

•   } else if (r) {
  

•           return r;
  

•   }
  

•   vm->pd_gpu_addr = radeon_sa_bo_gpu_addr(vm->page_directory);
  

•   /* Initially clear the page directory */
  

•   r = radeon_ib_get(rdev, R600_RING_TYPE_DMA_INDEX, &ib,
  

•                     NULL, pd_entries * 2 + 64);
  

•   if (r) {
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return r;
  

•   }
  

•   ib.length_dw = 0;
  

•   radeon_asic_vm_set_page(rdev, &ib, vm->pd_gpu_addr,
  

•                           0, pd_entries, 0, 0);
  

•   radeon_semaphore_sync_to(ib.semaphore, vm->fence);
  

•   r = radeon_ib_schedule(rdev, &ib, NULL);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return r;
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(ib.fence);
  

•   radeon_ib_free(rdev, &ib);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   /* allocate page table array */
  

•   pts_size = radeon_vm_num_pdes(rdev) * sizeof(struct radeon_sa_bo *);
  

•   vm->page_tables = kzalloc(pts_size, GFP_KERNEL);
  

•   if (vm->page_tables == NULL) {
  

•           DRM_ERROR("Cannot allocate memory for page table array\n");
  

•           radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
  

•           return -ENOMEM;
  

•   }
  

•   return 0;
  

+}

+/**

• • radeon_vm_add_to_lru - add VMs page table to LRU list
• • @rdev: radeon_device pointer
• • @vm: vm to add to LRU
• • Add the allocated page table to the LRU list (cayman+).
• • Global mutex must be locked!
• */

+void radeon_vm_add_to_lru(struct radeon_device *rdev, struct radeon_vm *vm) +{

•   list_del_init(&vm->list);
  

•   list_add_tail(&vm->list, &rdev->vm_manager.lru_vm);
  

+}

+/**

• • radeon_vm_grab_id - allocate the next free VMID
• • @rdev: radeon_device pointer
• • @vm: vm to allocate id for
• • @ring: ring we want to submit job to
• • Allocate an id for the vm (cayman+).
• • Returns the fence we need to sync to (if any).
• • Global and local mutex must be locked!
• */

+struct radeon_fence *radeon_vm_grab_id(struct radeon_device *rdev,

•                                  struct radeon_vm *vm, int ring)
  

+{

•   struct radeon_fence *best[RADEON_NUM_RINGS] = {};
  

•   unsigned choices[2] = {};
  

•   unsigned i;
  

•   /* check if the id is still valid */
  

•   if (vm->last_id_use && vm->last_id_use == rdev->vm_manager.active[vm->id])
  

•           return NULL;
  

•   /* we definately need to flush */
  

•   radeon_fence_unref(&vm->last_flush);
  

•   /* skip over VMID 0, since it is the system VM */
  

•   for (i = 1; i < rdev->vm_manager.nvm; ++i) {
  

•           struct radeon_fence *fence = rdev->vm_manager.active[i];
  

•           if (fence == NULL) {
  

•                   /* found a free one */
  

•                   vm->id = i;
  

•                   trace_radeon_vm_grab_id(vm->id, ring);
  

•                   return NULL;
  

•           }
  

•           if (radeon_fence_is_earlier(fence, best[fence->ring])) {
  

•                   best[fence->ring] = fence;
  

•                   choices[fence->ring == ring ? 0 : 1] = i;
  

•           }
  

•   }
  

•   for (i = 0; i < 2; ++i) {
  

•           if (choices[i]) {
  

•                   vm->id = choices[i];
  

•                   trace_radeon_vm_grab_id(vm->id, ring);
  

•                   return rdev->vm_manager.active[choices[i]];
  

•           }
  

•   }
  

•   /* should never happen */
  

•   BUG();
  

•   return NULL;
  

+}

+/**

• • radeon_vm_fence - remember fence for vm
• • @rdev: radeon_device pointer
• • @vm: vm we want to fence
• • @fence: fence to remember
• • Fence the vm (cayman+).
• • Set the fence used to protect page table and id.
• • Global and local mutex must be locked!
• */

+void radeon_vm_fence(struct radeon_device *rdev,

•                struct radeon_vm *vm,
  

•                struct radeon_fence *fence)
  

+{

•   radeon_fence_unref(&rdev->vm_manager.active[vm->id]);
  

•   rdev->vm_manager.active[vm->id] = radeon_fence_ref(fence);
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(fence);
  

•   radeon_fence_unref(&vm->last_id_use);
  

•   vm->last_id_use = radeon_fence_ref(fence);
  

+}

+/**

• • radeon_vm_bo_find - find the bo_va for a specific vm & bo
• • @vm: requested vm
• • @bo: requested buffer object
• • Find @bo inside the requested vm (cayman+).
• • Search inside the @bos vm list for the requested vm
• • Returns the found bo_va or NULL if none is found
• • Object has to be reserved!
• */

+struct radeon_bo_va *radeon_vm_bo_find(struct radeon_vm *vm,

•                                  struct radeon_bo *bo)
  

+{

•   struct radeon_bo_va *bo_va;
  

•   list_for_each_entry(bo_va, &bo->va, bo_list) {
  

•           if (bo_va->vm == vm) {
  

•                   return bo_va;
  

•           }
  

•   }
  

•   return NULL;
  

+}

+/**

• • radeon_vm_bo_add - add a bo to a specific vm
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • Add @bo into the requested vm (cayman+).
• • Add @bo to the list of bos associated with the vm
• • Returns newly added bo_va or NULL for failure
• • Object has to be reserved!
• */

+struct radeon_bo_va *radeon_vm_bo_add(struct radeon_device *rdev,

•                                 struct radeon_vm *vm,
  

•                                 struct radeon_bo *bo)
  

+{

•   struct radeon_bo_va *bo_va;
  

•   bo_va = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
  

•   if (bo_va == NULL) {
  

•           return NULL;
  

•   }
  

•   bo_va->vm = vm;
  

•   bo_va->bo = bo;
  

•   bo_va->soffset = 0;
  

•   bo_va->eoffset = 0;
  

•   bo_va->flags = 0;
  

•   bo_va->valid = false;
  

•   bo_va->ref_count = 1;
  

•   INIT_LIST_HEAD(&bo_va->bo_list);
  

•   INIT_LIST_HEAD(&bo_va->vm_list);
  

•   mutex_lock(&vm->mutex);
  

•   list_add(&bo_va->vm_list, &vm->va);
  

•   list_add_tail(&bo_va->bo_list, &bo->va);
  

•   mutex_unlock(&vm->mutex);
  

•   return bo_va;
  

+}

+/**

• • radeon_vm_bo_set_addr - set bos virtual address inside a vm
• • @rdev: radeon_device pointer
• • @bo_va: bo_va to store the address
• • @soffset: requested offset of the buffer in the VM address space
• • @flags: attributes of pages (read/write/valid/etc.)
• • Set offset of @bo_va (cayman+).
• • Validate and set the offset requested within the vm address space.
• • Returns 0 for success, error for failure.
• • Object has to be reserved!
• */

+int radeon_vm_bo_set_addr(struct radeon_device *rdev,

•                     struct radeon_bo_va *bo_va,
  

•                     uint64_t soffset,
  

•                     uint32_t flags)
  

+{

•   uint64_t size = radeon_bo_size(bo_va->bo);
  

•   uint64_t eoffset, last_offset = 0;
  

•   struct radeon_vm *vm = bo_va->vm;
  

•   struct radeon_bo_va *tmp;
  

•   struct list_head *head;
  

•   unsigned last_pfn;
  

•   if (soffset) {
  

•           /* make sure object fit at this offset */
  

•           eoffset = soffset + size;
  

•           if (soffset >= eoffset) {
  

•                   return -EINVAL;
  

•           }
  

•           last_pfn = eoffset / RADEON_GPU_PAGE_SIZE;
  

•           if (last_pfn > rdev->vm_manager.max_pfn) {
  

•                   dev_err(rdev->dev, "va above limit (0x%08X > 0x%08X)\n",
  

•                           last_pfn, rdev->vm_manager.max_pfn);
  

•                   return -EINVAL;
  

•           }
  

•   } else {
  

•           eoffset = last_pfn = 0;
  

•   }
  

•   mutex_lock(&vm->mutex);
  

•   head = &vm->va;
  

•   last_offset = 0;
  

•   list_for_each_entry(tmp, &vm->va, vm_list) {
  

•           if (bo_va == tmp) {
  

•                   /* skip over currently modified bo */
  

•                   continue;
  

•           }
  

•           if (soffset >= last_offset && eoffset <= tmp->soffset) {
  

•                   /* bo can be added before this one */
  

•                   break;
  

•           }
  

•           if (eoffset > tmp->soffset && soffset < tmp->eoffset) {
  

•                   /* bo and tmp overlap, invalid offset */
  

•                   dev_err(rdev->dev, "bo %p va 0x%08X conflict with (bo %p 0x%08X 0x%08X)\n",
  

•                           bo_va->bo, (unsigned)bo_va->soffset, tmp->bo,
  

•                           (unsigned)tmp->soffset, (unsigned)tmp->eoffset);
  

•                   mutex_unlock(&vm->mutex);
  

•                   return -EINVAL;
  

•           }
  

•           last_offset = tmp->eoffset;
  

•           head = &tmp->vm_list;
  

•   }
  

•   bo_va->soffset = soffset;
  

•   bo_va->eoffset = eoffset;
  

•   bo_va->flags = flags;
  

•   bo_va->valid = false;
  

•   list_move(&bo_va->vm_list, head);
  

•   mutex_unlock(&vm->mutex);
  

•   return 0;
  

+}

+/**

• • radeon_vm_map_gart - get the physical address of a gart page
• • @rdev: radeon_device pointer
• • @addr: the unmapped addr
• • Look up the physical address of the page that the pte resolves
• • to (cayman+).
• • Returns the physical address of the page.
• */

+uint64_t radeon_vm_map_gart(struct radeon_device *rdev, uint64_t addr) +{

•   uint64_t result;
  

•   /* page table offset */
  

•   result = rdev->gart.pages_addr[addr >> PAGE_SHIFT];
  

•   /* in case cpu page size != gpu page size*/
  

•   result |= addr & (~PAGE_MASK);
  

•   return result;
  

+}

+/**

• • radeon_vm_page_flags - translate page flags to what the hw uses
• • @flags: flags comming from userspace
• • Translate the flags the userspace ABI uses to hw flags.
• */

+static uint32_t radeon_vm_page_flags(uint32_t flags) +{

•    uint32_t hw_flags = 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_VALID) ? R600_PTE_VALID : 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_READABLE) ? R600_PTE_READABLE : 0;
  

•    hw_flags |= (flags & RADEON_VM_PAGE_WRITEABLE) ? R600_PTE_WRITEABLE : 0;
  

•    if (flags & RADEON_VM_PAGE_SYSTEM) {
  

•            hw_flags |= R600_PTE_SYSTEM;
  

•            hw_flags |= (flags & RADEON_VM_PAGE_SNOOPED) ? R600_PTE_SNOOPED : 0;
  

•    }
  

•    return hw_flags;
  

+}

+/**

• • radeon_vm_update_pdes - make sure that page directory is valid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @start: start of GPU address range
• • @end: end of GPU address range
• • Allocates new page tables if necessary
• • and updates the page directory (cayman+).
• • Returns 0 for success, error for failure.
• • Global and local mutex must be locked!
• */

+static int radeon_vm_update_pdes(struct radeon_device *rdev,

•                            struct radeon_vm *vm,
  

•                            struct radeon_ib *ib,
  

•                            uint64_t start, uint64_t end)
  

+{

•   static const uint32_t incr = RADEON_VM_PTE_COUNT * 8;
  

•   uint64_t last_pde = ~0, last_pt = ~0;
  

•   unsigned count = 0;
  

•   uint64_t pt_idx;
  

•   int r;
  

•   start = (start / RADEON_GPU_PAGE_SIZE) >> RADEON_VM_BLOCK_SIZE;
  

•   end = (end / RADEON_GPU_PAGE_SIZE) >> RADEON_VM_BLOCK_SIZE;
  

•   /* walk over the address space and update the page directory */
  

•   for (pt_idx = start; pt_idx <= end; ++pt_idx) {
  

•           uint64_t pde, pt;
  

•           if (vm->page_tables[pt_idx])
  

•                   continue;
  

+retry:

•           r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
  

•                                &vm->page_tables[pt_idx],
  

•                                RADEON_VM_PTE_COUNT * 8,
  

•                                RADEON_GPU_PAGE_SIZE, false);
  

•           if (r == -ENOMEM) {
  

•                   r = radeon_vm_evict(rdev, vm);
  

•                   if (r)
  

•                           return r;
  

•                   goto retry;
  

•           } else if (r) {
  

•                   return r;
  

•           }
  

•           pde = vm->pd_gpu_addr + pt_idx * 8;
  

•           pt = radeon_sa_bo_gpu_addr(vm->page_tables[pt_idx]);
  

•           if (((last_pde + 8 * count) != pde) ||
  

•               ((last_pt + incr * count) != pt)) {
  

•                   if (count) {
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pde,
  

•                                                   last_pt, count, incr,
  

•                                                   R600_PTE_VALID);
  

•                           count *= RADEON_VM_PTE_COUNT;
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pt, 0,
  

•                                                   count, 0, 0);
  

•                   }
  

•                   count = 1;
  

•                   last_pde = pde;
  

•                   last_pt = pt;
  

•           } else {
  

•                   ++count;
  

•           }
  

•   }
  

•   if (count) {
  

•           radeon_asic_vm_set_page(rdev, ib, last_pde, last_pt, count,
  

•                                   incr, R600_PTE_VALID);
  

•           count *= RADEON_VM_PTE_COUNT;
  

•           radeon_asic_vm_set_page(rdev, ib, last_pt, 0,
  

•                                   count, 0, 0);
  

•   }
  

•   return 0;
  

+}

+/**

• • radeon_vm_update_ptes - make sure that page tables are valid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @start: start of GPU address range
• • @end: end of GPU address range
• • @dst: destination address to map to
• • @flags: mapping flags
• • Update the page tables in the range @start - @end (cayman+).
• • Global and local mutex must be locked!
• */

+static void radeon_vm_update_ptes(struct radeon_device *rdev,

•                             struct radeon_vm *vm,
  

•                             struct radeon_ib *ib,
  

•                             uint64_t start, uint64_t end,
  

•                             uint64_t dst, uint32_t flags)
  

+{

•   static const uint64_t mask = RADEON_VM_PTE_COUNT - 1;
  

•   uint64_t last_pte = ~0, last_dst = ~0;
  

•   unsigned count = 0;
  

•   uint64_t addr;
  

•   start = start / RADEON_GPU_PAGE_SIZE;
  

•   end = end / RADEON_GPU_PAGE_SIZE;
  

•   /* walk over the address space and update the page tables */
  

•   for (addr = start; addr < end; ) {
  

•           uint64_t pt_idx = addr >> RADEON_VM_BLOCK_SIZE;
  

•           unsigned nptes;
  

•           uint64_t pte;
  

•           if ((addr & ~mask) == (end & ~mask))
  

•                   nptes = end - addr;
  

•           else
  

•                   nptes = RADEON_VM_PTE_COUNT - (addr & mask);
  

•           pte = radeon_sa_bo_gpu_addr(vm->page_tables[pt_idx]);
  

•           pte += (addr & mask) * 8;
  

•           if ((last_pte + 8 * count) != pte) {
  

•                   if (count) {
  

•                           radeon_asic_vm_set_page(rdev, ib, last_pte,
  

•                                                   last_dst, count,
  

•                                                   RADEON_GPU_PAGE_SIZE,
  

•                                                   flags);
  

•                   }
  

•                   count = nptes;
  

•                   last_pte = pte;
  

•                   last_dst = dst;
  

•           } else {
  

•                   count += nptes;
  

•           }
  

•           addr += nptes;
  

•           dst += nptes * RADEON_GPU_PAGE_SIZE;
  

•   }
  

•   if (count) {
  

•           radeon_asic_vm_set_page(rdev, ib, last_pte,
  

•                                   last_dst, count,
  

•                                   RADEON_GPU_PAGE_SIZE, flags);
  

•   }
  

+}

+/**

• • radeon_vm_bo_update - map a bo into the vm page table
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • @mem: ttm mem
• • Fill in the page table entries for @bo (cayman+).
• • Returns 0 for success, -EINVAL for failure.
• • Object have to be reserved & global and local mutex must be locked!
• */

+int radeon_vm_bo_update(struct radeon_device *rdev,

•                   struct radeon_vm *vm,
  

•                   struct radeon_bo *bo,
  

•                   struct ttm_mem_reg *mem)
  

+{

•   struct radeon_ib ib;
  

•   struct radeon_bo_va *bo_va;
  

•   unsigned nptes, npdes, ndw;
  

•   uint64_t addr;
  

•   int r;
  

•   /* nothing to do if vm isn't bound */
  

•   if (vm->page_directory == NULL)
  

•           return 0;
  

•   bo_va = radeon_vm_bo_find(vm, bo);
  

•   if (bo_va == NULL) {
  

•           dev_err(rdev->dev, "bo %p not in vm %p\n", bo, vm);
  

•           return -EINVAL;
  

•   }
  

•   if (!bo_va->soffset) {
  

•           dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
  

•                   bo, vm);
  

•           return -EINVAL;
  

•   }
  

•   if ((bo_va->valid && mem) || (!bo_va->valid && mem == NULL))
  

•           return 0;
  

•   bo_va->flags &= ~RADEON_VM_PAGE_VALID;
  

•   bo_va->flags &= ~RADEON_VM_PAGE_SYSTEM;
  

•   if (mem) {
  

•           addr = mem->start << PAGE_SHIFT;
  

•           if (mem->mem_type != TTM_PL_SYSTEM) {
  

•                   bo_va->flags |= RADEON_VM_PAGE_VALID;
  

•                   bo_va->valid = true;
  

•           }
  

•           if (mem->mem_type == TTM_PL_TT) {
  

•                   bo_va->flags |= RADEON_VM_PAGE_SYSTEM;
  

•           } else {
  

•                   addr += rdev->vm_manager.vram_base_offset;
  

•           }
  

•   } else {
  

•           addr = 0;
  

•           bo_va->valid = false;
  

•   }
  

•   trace_radeon_vm_bo_update(bo_va);
  

•   nptes = radeon_bo_ngpu_pages(bo);
  

•   /* assume two extra pdes in case the mapping overlaps the borders */
  

•   npdes = (nptes >> RADEON_VM_BLOCK_SIZE) + 2;
  

•   /* padding, etc. */
  

•   ndw = 64;
  

•   if (RADEON_VM_BLOCK_SIZE > 11)
  

•           /* reserve space for one header for every 2k dwords */
  

•           ndw += (nptes >> 11) * 4;
  

•   else
  

•           /* reserve space for one header for
  

•               every (1 << BLOCK_SIZE) entries */
  

•           ndw += (nptes >> RADEON_VM_BLOCK_SIZE) * 4;
  

•   /* reserve space for pte addresses */
  

•   ndw += nptes * 2;
  

•   /* reserve space for one header for every 2k dwords */
  

•   ndw += (npdes >> 11) * 4;
  

•   /* reserve space for pde addresses */
  

•   ndw += npdes * 2;
  

•   /* reserve space for clearing new page tables */
  

•   ndw += npdes * 2 * RADEON_VM_PTE_COUNT;
  

•   /* update too big for an IB */
  

•   if (ndw > 0xfffff)
  

•           return -ENOMEM;
  

•   r = radeon_ib_get(rdev, R600_RING_TYPE_DMA_INDEX, &ib, NULL, ndw * 4);
  

•   if (r)
  

•           return r;
  

•   ib.length_dw = 0;
  

•   r = radeon_vm_update_pdes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           return r;
  

•   }
  

•   radeon_vm_update_ptes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset,
  

•                         addr, radeon_vm_page_flags(bo_va->flags));
  

•   radeon_semaphore_sync_to(ib.semaphore, vm->fence);
  

•   r = radeon_ib_schedule(rdev, &ib, NULL);
  

•   if (r) {
  

•           radeon_ib_free(rdev, &ib);
  

•           return r;
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   vm->fence = radeon_fence_ref(ib.fence);
  

•   radeon_ib_free(rdev, &ib);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   return 0;
  

+}

+/**

• • radeon_vm_bo_rmv - remove a bo to a specific vm
• • @rdev: radeon_device pointer
• • @bo_va: requested bo_va
• • Remove @bo_va->bo from the requested vm (cayman+).
• • Remove @bo_va->bo from the list of bos associated with the bo_va->vm and
• • remove the ptes for @bo_va in the page table.
• • Returns 0 for success.
• • Object have to be reserved!
• */

+int radeon_vm_bo_rmv(struct radeon_device *rdev,

•                struct radeon_bo_va *bo_va)
  

+{

•   int r = 0;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   mutex_lock(&bo_va->vm->mutex);
  

•   if (bo_va->soffset) {
  

•           r = radeon_vm_bo_update(rdev, bo_va->vm, bo_va->bo, NULL);
  

•   }
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   list_del(&bo_va->vm_list);
  

•   mutex_unlock(&bo_va->vm->mutex);
  

•   list_del(&bo_va->bo_list);
  

•   kfree(bo_va);
  

•   return r;
  

+}

+/**

• • radeon_vm_bo_invalidate - mark the bo as invalid
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • @bo: radeon buffer object
• • Mark @bo as invalid (cayman+).
• */

+void radeon_vm_bo_invalidate(struct radeon_device *rdev,

•                        struct radeon_bo *bo)
  

+{

•   struct radeon_bo_va *bo_va;
  

•   list_for_each_entry(bo_va, &bo->va, bo_list) {
  

•           bo_va->valid = false;
  

•   }
  

+}

+/**

• • radeon_vm_init - initialize a vm instance
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • Init @vm fields (cayman+).
• */

+void radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm) +{

•   vm->id = 0;
  

•   vm->fence = NULL;
  

•   vm->last_flush = NULL;
  

•   vm->last_id_use = NULL;
  

•   mutex_init(&vm->mutex);
  

•   INIT_LIST_HEAD(&vm->list);
  

•   INIT_LIST_HEAD(&vm->va);
  

+}

+/**

• • radeon_vm_fini - tear down a vm instance
• • @rdev: radeon_device pointer
• • @vm: requested vm
• • Tear down @vm (cayman+).
• • Unbind the VM and remove all bos from the vm bo list
• */

+void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm) +{

•   struct radeon_bo_va *bo_va, *tmp;
  

•   int r;
  

•   mutex_lock(&rdev->vm_manager.lock);
  

•   mutex_lock(&vm->mutex);
  

•   radeon_vm_free_pt(rdev, vm);
  

•   mutex_unlock(&rdev->vm_manager.lock);
  

•   if (!list_empty(&vm->va)) {
  

•           dev_err(rdev->dev, "still active bo inside vm\n");
  

•   }
  

•   list_for_each_entry_safe(bo_va, tmp, &vm->va, vm_list) {
  

•           list_del_init(&bo_va->vm_list);
  

•           r = radeon_bo_reserve(bo_va->bo, false);
  

•           if (!r) {
  

•                   list_del_init(&bo_va->bo_list);
  

•                   radeon_bo_unreserve(bo_va->bo);
  

•                   kfree(bo_va);
  

•           }
  

•   }
  

•   radeon_fence_unref(&vm->fence);
  

•   radeon_fence_unref(&vm->last_flush);
  

•   radeon_fence_unref(&vm->last_id_use);
  

•   mutex_unlock(&vm->mutex);
  

+}

1.8.3.2

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