diff options
Diffstat (limited to 'drivers/gpu/drm/imagination/pvr_free_list.c')
-rw-r--r-- | drivers/gpu/drm/imagination/pvr_free_list.c | 625 |
1 files changed, 625 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imagination/pvr_free_list.c b/drivers/gpu/drm/imagination/pvr_free_list.c new file mode 100644 index 000000000000..c61fd417edcb --- /dev/null +++ b/drivers/gpu/drm/imagination/pvr_free_list.c @@ -0,0 +1,625 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* Copyright (c) 2023 Imagination Technologies Ltd. */ + +#include "pvr_free_list.h" +#include "pvr_gem.h" +#include "pvr_hwrt.h" +#include "pvr_rogue_fwif.h" +#include "pvr_vm.h" + +#include <drm/drm_gem.h> +#include <linux/slab.h> +#include <linux/xarray.h> +#include <uapi/drm/pvr_drm.h> + +#define FREE_LIST_ENTRY_SIZE sizeof(u32) + +#define FREE_LIST_ALIGNMENT \ + ((ROGUE_BIF_PM_FREELIST_BASE_ADDR_ALIGNSIZE / FREE_LIST_ENTRY_SIZE) - 1) + +#define FREE_LIST_MIN_PAGES 50 +#define FREE_LIST_MIN_PAGES_BRN66011 40 +#define FREE_LIST_MIN_PAGES_ROGUEXE 25 + +/** + * pvr_get_free_list_min_pages() - Get minimum free list size for this device + * @pvr_dev: Device pointer. + * + * Returns: + * * Minimum free list size, in PM physical pages. + */ +u32 +pvr_get_free_list_min_pages(struct pvr_device *pvr_dev) +{ + u32 value; + + if (PVR_HAS_FEATURE(pvr_dev, roguexe)) { + if (PVR_HAS_QUIRK(pvr_dev, 66011)) + value = FREE_LIST_MIN_PAGES_BRN66011; + else + value = FREE_LIST_MIN_PAGES_ROGUEXE; + } else { + value = FREE_LIST_MIN_PAGES; + } + + return value; +} + +static int +free_list_create_kernel_structure(struct pvr_file *pvr_file, + struct drm_pvr_ioctl_create_free_list_args *args, + struct pvr_free_list *free_list) +{ + struct pvr_gem_object *free_list_obj; + struct pvr_vm_context *vm_ctx; + u64 free_list_size; + int err; + + if (args->grow_threshold > 100 || + args->initial_num_pages > args->max_num_pages || + args->grow_num_pages > args->max_num_pages || + args->max_num_pages == 0 || + (args->initial_num_pages < args->max_num_pages && !args->grow_num_pages) || + (args->initial_num_pages == args->max_num_pages && args->grow_num_pages)) + return -EINVAL; + + if ((args->initial_num_pages & FREE_LIST_ALIGNMENT) || + (args->max_num_pages & FREE_LIST_ALIGNMENT) || + (args->grow_num_pages & FREE_LIST_ALIGNMENT)) + return -EINVAL; + + vm_ctx = pvr_vm_context_lookup(pvr_file, args->vm_context_handle); + if (!vm_ctx) + return -EINVAL; + + free_list_obj = pvr_vm_find_gem_object(vm_ctx, args->free_list_gpu_addr, + NULL, &free_list_size); + if (!free_list_obj) { + err = -EINVAL; + goto err_put_vm_context; + } + + if ((free_list_obj->flags & DRM_PVR_BO_ALLOW_CPU_USERSPACE_ACCESS) || + !(free_list_obj->flags & DRM_PVR_BO_PM_FW_PROTECT) || + free_list_size < (args->max_num_pages * FREE_LIST_ENTRY_SIZE)) { + err = -EINVAL; + goto err_put_free_list_obj; + } + + free_list->pvr_dev = pvr_file->pvr_dev; + free_list->current_pages = 0; + free_list->max_pages = args->max_num_pages; + free_list->grow_pages = args->grow_num_pages; + free_list->grow_threshold = args->grow_threshold; + free_list->obj = free_list_obj; + free_list->free_list_gpu_addr = args->free_list_gpu_addr; + free_list->initial_num_pages = args->initial_num_pages; + + pvr_vm_context_put(vm_ctx); + + return 0; + +err_put_free_list_obj: + pvr_gem_object_put(free_list_obj); + +err_put_vm_context: + pvr_vm_context_put(vm_ctx); + + return err; +} + +static void +free_list_destroy_kernel_structure(struct pvr_free_list *free_list) +{ + WARN_ON(!list_empty(&free_list->hwrt_list)); + + pvr_gem_object_put(free_list->obj); +} + +/** + * calculate_free_list_ready_pages_locked() - Function to work out the number of free + * list pages to reserve for growing within + * the FW without having to wait for the + * host to progress a grow request + * @free_list: Pointer to free list. + * @pages: Total pages currently in free list. + * + * If the threshold or grow size means less than the alignment size (4 pages on + * Rogue), then the feature is not used. + * + * Caller must hold &free_list->lock. + * + * Return: number of pages to reserve. + */ +static u32 +calculate_free_list_ready_pages_locked(struct pvr_free_list *free_list, u32 pages) +{ + u32 ready_pages; + + lockdep_assert_held(&free_list->lock); + + ready_pages = ((pages * free_list->grow_threshold) / 100); + + /* The number of pages must be less than the grow size. */ + ready_pages = min(ready_pages, free_list->grow_pages); + + /* + * The number of pages must be a multiple of the free list align size. + */ + ready_pages &= ~FREE_LIST_ALIGNMENT; + + return ready_pages; +} + +static u32 +calculate_free_list_ready_pages(struct pvr_free_list *free_list, u32 pages) +{ + u32 ret; + + mutex_lock(&free_list->lock); + + ret = calculate_free_list_ready_pages_locked(free_list, pages); + + mutex_unlock(&free_list->lock); + + return ret; +} + +static void +free_list_fw_init(void *cpu_ptr, void *priv) +{ + struct rogue_fwif_freelist *fw_data = cpu_ptr; + struct pvr_free_list *free_list = priv; + u32 ready_pages; + + /* Fill out FW structure */ + ready_pages = calculate_free_list_ready_pages(free_list, + free_list->initial_num_pages); + + fw_data->max_pages = free_list->max_pages; + fw_data->current_pages = free_list->initial_num_pages - ready_pages; + fw_data->grow_pages = free_list->grow_pages; + fw_data->ready_pages = ready_pages; + fw_data->freelist_id = free_list->fw_id; + fw_data->grow_pending = false; + fw_data->current_stack_top = fw_data->current_pages - 1; + fw_data->freelist_dev_addr = free_list->free_list_gpu_addr; + fw_data->current_dev_addr = (fw_data->freelist_dev_addr + + ((fw_data->max_pages - fw_data->current_pages) * + FREE_LIST_ENTRY_SIZE)) & + ~((u64)ROGUE_BIF_PM_FREELIST_BASE_ADDR_ALIGNSIZE - 1); +} + +static int +free_list_create_fw_structure(struct pvr_file *pvr_file, + struct drm_pvr_ioctl_create_free_list_args *args, + struct pvr_free_list *free_list) +{ + struct pvr_device *pvr_dev = pvr_file->pvr_dev; + + /* + * Create and map the FW structure so we can initialise it. This is not + * accessed on the CPU side post-initialisation so the mapping lifetime + * is only for this function. + */ + free_list->fw_data = pvr_fw_object_create_and_map(pvr_dev, sizeof(*free_list->fw_data), + PVR_BO_FW_FLAGS_DEVICE_UNCACHED, + free_list_fw_init, free_list, + &free_list->fw_obj); + if (IS_ERR(free_list->fw_data)) + return PTR_ERR(free_list->fw_data); + + return 0; +} + +static void +free_list_destroy_fw_structure(struct pvr_free_list *free_list) +{ + pvr_fw_object_unmap_and_destroy(free_list->fw_obj); +} + +static int +pvr_free_list_insert_pages_locked(struct pvr_free_list *free_list, + struct sg_table *sgt, u32 offset, u32 num_pages) +{ + struct sg_dma_page_iter dma_iter; + u32 *page_list; + + lockdep_assert_held(&free_list->lock); + + page_list = pvr_gem_object_vmap(free_list->obj); + if (IS_ERR(page_list)) + return PTR_ERR(page_list); + + offset /= FREE_LIST_ENTRY_SIZE; + /* clang-format off */ + for_each_sgtable_dma_page(sgt, &dma_iter, 0) { + dma_addr_t dma_addr = sg_page_iter_dma_address(&dma_iter); + u64 dma_pfn = dma_addr >> + ROGUE_BIF_PM_PHYSICAL_PAGE_ALIGNSHIFT; + u32 dma_addr_offset; + + BUILD_BUG_ON(ROGUE_BIF_PM_PHYSICAL_PAGE_SIZE > PAGE_SIZE); + + for (dma_addr_offset = 0; dma_addr_offset < PAGE_SIZE; + dma_addr_offset += ROGUE_BIF_PM_PHYSICAL_PAGE_SIZE) { + WARN_ON_ONCE(dma_pfn >> 32); + + page_list[offset++] = (u32)dma_pfn; + dma_pfn++; + + num_pages--; + if (!num_pages) + break; + } + + if (!num_pages) + break; + }; + /* clang-format on */ + + /* Make sure our free_list update is flushed. */ + wmb(); + + pvr_gem_object_vunmap(free_list->obj); + + return 0; +} + +static int +pvr_free_list_insert_node_locked(struct pvr_free_list_node *free_list_node) +{ + struct pvr_free_list *free_list = free_list_node->free_list; + struct sg_table *sgt; + u32 start_page; + u32 offset; + int err; + + lockdep_assert_held(&free_list->lock); + + start_page = free_list->max_pages - free_list->current_pages - + free_list_node->num_pages; + offset = (start_page * FREE_LIST_ENTRY_SIZE) & + ~((u64)ROGUE_BIF_PM_FREELIST_BASE_ADDR_ALIGNSIZE - 1); + + sgt = drm_gem_shmem_get_pages_sgt(&free_list_node->mem_obj->base); + if (WARN_ON(IS_ERR(sgt))) + return PTR_ERR(sgt); + + err = pvr_free_list_insert_pages_locked(free_list, sgt, + offset, free_list_node->num_pages); + if (!err) + free_list->current_pages += free_list_node->num_pages; + + return err; +} + +static int +pvr_free_list_grow(struct pvr_free_list *free_list, u32 num_pages) +{ + struct pvr_device *pvr_dev = free_list->pvr_dev; + struct pvr_free_list_node *free_list_node; + int err; + + mutex_lock(&free_list->lock); + + if (num_pages & FREE_LIST_ALIGNMENT) { + err = -EINVAL; + goto err_unlock; + } + + free_list_node = kzalloc(sizeof(*free_list_node), GFP_KERNEL); + if (!free_list_node) { + err = -ENOMEM; + goto err_unlock; + } + + free_list_node->num_pages = num_pages; + free_list_node->free_list = free_list; + + free_list_node->mem_obj = pvr_gem_object_create(pvr_dev, + num_pages << + ROGUE_BIF_PM_PHYSICAL_PAGE_ALIGNSHIFT, + PVR_BO_FW_FLAGS_DEVICE_CACHED); + if (IS_ERR(free_list_node->mem_obj)) { + err = PTR_ERR(free_list_node->mem_obj); + goto err_free; + } + + err = pvr_free_list_insert_node_locked(free_list_node); + if (err) + goto err_destroy_gem_object; + + list_add_tail(&free_list_node->node, &free_list->mem_block_list); + + /* + * Reserve a number ready pages to allow the FW to process OOM quickly + * and asynchronously request a grow. + */ + free_list->ready_pages = + calculate_free_list_ready_pages_locked(free_list, + free_list->current_pages); + free_list->current_pages -= free_list->ready_pages; + + mutex_unlock(&free_list->lock); + + return 0; + +err_destroy_gem_object: + pvr_gem_object_put(free_list_node->mem_obj); + +err_free: + kfree(free_list_node); + +err_unlock: + mutex_unlock(&free_list->lock); + + return err; +} + +void pvr_free_list_process_grow_req(struct pvr_device *pvr_dev, + struct rogue_fwif_fwccb_cmd_freelist_gs_data *req) +{ + struct pvr_free_list *free_list = pvr_free_list_lookup_id(pvr_dev, req->freelist_id); + struct rogue_fwif_kccb_cmd resp_cmd = { + .cmd_type = ROGUE_FWIF_KCCB_CMD_FREELIST_GROW_UPDATE, + }; + struct rogue_fwif_freelist_gs_data *resp = &resp_cmd.cmd_data.free_list_gs_data; + u32 grow_pages = 0; + + /* If we don't have a freelist registered for this ID, we can't do much. */ + if (WARN_ON(!free_list)) + return; + + /* Since the FW made the request, it has already consumed the ready pages, + * update the host struct. + */ + free_list->current_pages += free_list->ready_pages; + free_list->ready_pages = 0; + + /* If the grow succeeds, update the grow_pages argument. */ + if (!pvr_free_list_grow(free_list, free_list->grow_pages)) + grow_pages = free_list->grow_pages; + + /* Now prepare the response and send it back to the FW. */ + pvr_fw_object_get_fw_addr(free_list->fw_obj, &resp->freelist_fw_addr); + resp->delta_pages = grow_pages; + resp->new_pages = free_list->current_pages + free_list->ready_pages; + resp->ready_pages = free_list->ready_pages; + pvr_free_list_put(free_list); + + WARN_ON(pvr_kccb_send_cmd(pvr_dev, &resp_cmd, NULL)); +} + +static void +pvr_free_list_free_node(struct pvr_free_list_node *free_list_node) +{ + pvr_gem_object_put(free_list_node->mem_obj); + + kfree(free_list_node); +} + +/** + * pvr_free_list_create() - Create a new free list and return an object pointer + * @pvr_file: Pointer to pvr_file structure. + * @args: Creation arguments from userspace. + * + * Return: + * * Pointer to new free_list, or + * * ERR_PTR(-%ENOMEM) on out of memory. + */ +struct pvr_free_list * +pvr_free_list_create(struct pvr_file *pvr_file, + struct drm_pvr_ioctl_create_free_list_args *args) +{ + struct pvr_free_list *free_list; + int err; + + /* Create and fill out the kernel structure */ + free_list = kzalloc(sizeof(*free_list), GFP_KERNEL); + + if (!free_list) + return ERR_PTR(-ENOMEM); + + kref_init(&free_list->ref_count); + INIT_LIST_HEAD(&free_list->mem_block_list); + INIT_LIST_HEAD(&free_list->hwrt_list); + mutex_init(&free_list->lock); + + err = free_list_create_kernel_structure(pvr_file, args, free_list); + if (err < 0) + goto err_free; + + /* Allocate global object ID for firmware. */ + err = xa_alloc(&pvr_file->pvr_dev->free_list_ids, + &free_list->fw_id, + free_list, + xa_limit_32b, + GFP_KERNEL); + if (err) + goto err_destroy_kernel_structure; + + err = free_list_create_fw_structure(pvr_file, args, free_list); + if (err < 0) + goto err_free_fw_id; + + err = pvr_free_list_grow(free_list, args->initial_num_pages); + if (err < 0) + goto err_fw_struct_cleanup; + + return free_list; + +err_fw_struct_cleanup: + WARN_ON(pvr_fw_structure_cleanup(free_list->pvr_dev, + ROGUE_FWIF_CLEANUP_FREELIST, + free_list->fw_obj, 0)); + +err_free_fw_id: + xa_erase(&free_list->pvr_dev->free_list_ids, free_list->fw_id); + +err_destroy_kernel_structure: + free_list_destroy_kernel_structure(free_list); + +err_free: + mutex_destroy(&free_list->lock); + kfree(free_list); + + return ERR_PTR(err); +} + +static void +pvr_free_list_release(struct kref *ref_count) +{ + struct pvr_free_list *free_list = + container_of(ref_count, struct pvr_free_list, ref_count); + struct list_head *pos, *n; + int err; + + xa_erase(&free_list->pvr_dev->free_list_ids, free_list->fw_id); + + err = pvr_fw_structure_cleanup(free_list->pvr_dev, + ROGUE_FWIF_CLEANUP_FREELIST, + free_list->fw_obj, 0); + if (err == -EBUSY) { + /* Flush the FWCCB to process any HWR or freelist reconstruction + * request that might keep the freelist busy, and try again. + */ + pvr_fwccb_process(free_list->pvr_dev); + err = pvr_fw_structure_cleanup(free_list->pvr_dev, + ROGUE_FWIF_CLEANUP_FREELIST, + free_list->fw_obj, 0); + } + + WARN_ON(err); + + /* clang-format off */ + list_for_each_safe(pos, n, &free_list->mem_block_list) { + struct pvr_free_list_node *free_list_node = + container_of(pos, struct pvr_free_list_node, node); + + list_del(pos); + pvr_free_list_free_node(free_list_node); + } + /* clang-format on */ + + free_list_destroy_kernel_structure(free_list); + free_list_destroy_fw_structure(free_list); + mutex_destroy(&free_list->lock); + kfree(free_list); +} + +/** + * pvr_destroy_free_lists_for_file: Destroy any free lists associated with the + * given file. + * @pvr_file: Pointer to pvr_file structure. + * + * Removes all free lists associated with @pvr_file from the device free_list + * list and drops initial references. Free lists will then be destroyed once + * all outstanding references are dropped. + */ +void pvr_destroy_free_lists_for_file(struct pvr_file *pvr_file) +{ + struct pvr_free_list *free_list; + unsigned long handle; + + xa_for_each(&pvr_file->free_list_handles, handle, free_list) { + (void)free_list; + pvr_free_list_put(xa_erase(&pvr_file->free_list_handles, handle)); + } +} + +/** + * pvr_free_list_put() - Release reference on free list + * @free_list: Pointer to list to release reference on + */ +void +pvr_free_list_put(struct pvr_free_list *free_list) +{ + if (free_list) + kref_put(&free_list->ref_count, pvr_free_list_release); +} + +void pvr_free_list_add_hwrt(struct pvr_free_list *free_list, struct pvr_hwrt_data *hwrt_data) +{ + mutex_lock(&free_list->lock); + + list_add_tail(&hwrt_data->freelist_node, &free_list->hwrt_list); + + mutex_unlock(&free_list->lock); +} + +void pvr_free_list_remove_hwrt(struct pvr_free_list *free_list, struct pvr_hwrt_data *hwrt_data) +{ + mutex_lock(&free_list->lock); + + list_del(&hwrt_data->freelist_node); + + mutex_unlock(&free_list->lock); +} + +static void +pvr_free_list_reconstruct(struct pvr_device *pvr_dev, u32 freelist_id) +{ + struct pvr_free_list *free_list = pvr_free_list_lookup_id(pvr_dev, freelist_id); + struct pvr_free_list_node *free_list_node; + struct rogue_fwif_freelist *fw_data; + struct pvr_hwrt_data *hwrt_data; + + if (!free_list) + return; + + mutex_lock(&free_list->lock); + + /* Rebuild the free list based on the memory block list. */ + free_list->current_pages = 0; + + list_for_each_entry(free_list_node, &free_list->mem_block_list, node) + WARN_ON(pvr_free_list_insert_node_locked(free_list_node)); + + /* + * Remove the ready pages, which are reserved to allow the FW to process OOM quickly and + * asynchronously request a grow. + */ + free_list->current_pages -= free_list->ready_pages; + + fw_data = free_list->fw_data; + fw_data->current_stack_top = fw_data->current_pages - 1; + fw_data->allocated_page_count = 0; + fw_data->allocated_mmu_page_count = 0; + + /* Reset the state of any associated HWRTs. */ + list_for_each_entry(hwrt_data, &free_list->hwrt_list, freelist_node) { + struct rogue_fwif_hwrtdata *hwrt_fw_data = pvr_fw_object_vmap(hwrt_data->fw_obj); + + if (!WARN_ON(IS_ERR(hwrt_fw_data))) { + hwrt_fw_data->state = ROGUE_FWIF_RTDATA_STATE_HWR; + hwrt_fw_data->hwrt_data_flags &= ~HWRTDATA_HAS_LAST_GEOM; + } + + pvr_fw_object_vunmap(hwrt_data->fw_obj); + } + + mutex_unlock(&free_list->lock); + + pvr_free_list_put(free_list); +} + +void +pvr_free_list_process_reconstruct_req(struct pvr_device *pvr_dev, + struct rogue_fwif_fwccb_cmd_freelists_reconstruction_data *req) +{ + struct rogue_fwif_kccb_cmd resp_cmd = { + .cmd_type = ROGUE_FWIF_KCCB_CMD_FREELISTS_RECONSTRUCTION_UPDATE, + }; + struct rogue_fwif_freelists_reconstruction_data *resp = + &resp_cmd.cmd_data.free_lists_reconstruction_data; + + for (u32 i = 0; i < req->freelist_count; i++) + pvr_free_list_reconstruct(pvr_dev, req->freelist_ids[i]); + + resp->freelist_count = req->freelist_count; + memcpy(resp->freelist_ids, req->freelist_ids, + req->freelist_count * sizeof(resp->freelist_ids[0])); + + WARN_ON(pvr_kccb_send_cmd(pvr_dev, &resp_cmd, NULL)); +} |