diff options
author | Sarah Walker <sarah.walker@imgtec.com> | 2023-11-22 19:34:35 +0300 |
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committer | Maxime Ripard <mripard@kernel.org> | 2023-11-23 11:01:46 +0300 |
commit | 927f3e0253c11276f0237ca1a14e77c48957c069 (patch) | |
tree | be2affa0933b13116137dee0d73ebc88bc0ca16b /drivers/gpu/drm/imagination/pvr_vm_mips.c | |
parent | cc1aeedb98ad347c06ff59e991b2f94dfb4c565d (diff) | |
download | linux-927f3e0253c11276f0237ca1a14e77c48957c069.tar.xz |
drm/imagination: Implement MIPS firmware processor and MMU support
Add support for the MIPS firmware processor, used in the Series AXE GPU.
The MIPS firmware processor uses a separate MMU to the rest of the GPU, so
this patch adds support for that as well.
Changes since v8:
- Corrected license identifiers
Changes since v6:
- Fix integer overflow in VM map error path
Changes since v5:
- Use alloc_page() when allocating MIPS pagetable
Changes since v3:
- Get regs resource (removed from GPU resources commit)
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Link: https://lore.kernel.org/r/a114f7b3e97cb07460c7f2842901716a9207b0c4.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/imagination/pvr_vm_mips.c')
-rw-r--r-- | drivers/gpu/drm/imagination/pvr_vm_mips.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imagination/pvr_vm_mips.c b/drivers/gpu/drm/imagination/pvr_vm_mips.c new file mode 100644 index 000000000000..7268cf6e630b --- /dev/null +++ b/drivers/gpu/drm/imagination/pvr_vm_mips.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* Copyright (c) 2023 Imagination Technologies Ltd. */ + +#include "pvr_device.h" +#include "pvr_fw_mips.h" +#include "pvr_gem.h" +#include "pvr_mmu.h" +#include "pvr_rogue_mips.h" +#include "pvr_vm.h" +#include "pvr_vm_mips.h" + +#include <drm/drm_managed.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/types.h> + +/** + * pvr_vm_mips_init() - Initialise MIPS FW pagetable + * @pvr_dev: Target PowerVR device. + * + * Returns: + * * 0 on success, + * * -%EINVAL, + * * Any error returned by pvr_gem_object_create(), or + * * And error returned by pvr_gem_object_vmap(). + */ +int +pvr_vm_mips_init(struct pvr_device *pvr_dev) +{ + u32 pt_size = 1 << ROGUE_MIPSFW_LOG2_PAGETABLE_SIZE_4K(pvr_dev); + struct device *dev = from_pvr_device(pvr_dev)->dev; + struct pvr_fw_mips_data *mips_data; + u32 phys_bus_width; + int page_nr; + int err; + + /* Page table size must be at most ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * 4k pages. */ + if (pt_size > ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * SZ_4K) + return -EINVAL; + + if (PVR_FEATURE_VALUE(pvr_dev, phys_bus_width, &phys_bus_width)) + return -EINVAL; + + mips_data = drmm_kzalloc(from_pvr_device(pvr_dev), sizeof(*mips_data), GFP_KERNEL); + if (!mips_data) + return -ENOMEM; + + for (page_nr = 0; page_nr < ARRAY_SIZE(mips_data->pt_pages); page_nr++) { + mips_data->pt_pages[page_nr] = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (!mips_data->pt_pages[page_nr]) { + err = -ENOMEM; + goto err_free_pages; + } + + mips_data->pt_dma_addr[page_nr] = dma_map_page(dev, mips_data->pt_pages[page_nr], 0, + PAGE_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, mips_data->pt_dma_addr[page_nr])) { + err = -ENOMEM; + goto err_free_pages; + } + } + + mips_data->pt = vmap(mips_data->pt_pages, pt_size >> PAGE_SHIFT, VM_MAP, + pgprot_writecombine(PAGE_KERNEL)); + if (!mips_data->pt) { + err = -ENOMEM; + goto err_free_pages; + } + + mips_data->pfn_mask = (phys_bus_width > 32) ? ROGUE_MIPSFW_ENTRYLO_PFN_MASK_ABOVE_32BIT : + ROGUE_MIPSFW_ENTRYLO_PFN_MASK; + + mips_data->cache_policy = (phys_bus_width > 32) ? ROGUE_MIPSFW_CACHED_POLICY_ABOVE_32BIT : + ROGUE_MIPSFW_CACHED_POLICY; + + pvr_dev->fw_dev.processor_data.mips_data = mips_data; + + return 0; + +err_free_pages: + for (; page_nr >= 0; page_nr--) { + if (mips_data->pt_dma_addr[page_nr]) + dma_unmap_page(from_pvr_device(pvr_dev)->dev, + mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE); + + if (mips_data->pt_pages[page_nr]) + __free_page(mips_data->pt_pages[page_nr]); + } + + return err; +} + +/** + * pvr_vm_mips_fini() - Release MIPS FW pagetable + * @pvr_dev: Target PowerVR device. + */ +void +pvr_vm_mips_fini(struct pvr_device *pvr_dev) +{ + struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev; + struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data; + int page_nr; + + vunmap(mips_data->pt); + for (page_nr = ARRAY_SIZE(mips_data->pt_pages) - 1; page_nr >= 0; page_nr--) { + dma_unmap_page(from_pvr_device(pvr_dev)->dev, + mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE); + + __free_page(mips_data->pt_pages[page_nr]); + } + + fw_dev->processor_data.mips_data = NULL; +} + +static u32 +get_mips_pte_flags(bool read, bool write, u32 cache_policy) +{ + u32 flags = 0; + + if (read && write) /* Read/write. */ + flags |= ROGUE_MIPSFW_ENTRYLO_DIRTY_EN; + else if (write) /* Write only. */ + flags |= ROGUE_MIPSFW_ENTRYLO_READ_INHIBIT_EN; + else + WARN_ON(!read); + + flags |= cache_policy << ROGUE_MIPSFW_ENTRYLO_CACHE_POLICY_SHIFT; + + flags |= ROGUE_MIPSFW_ENTRYLO_VALID_EN | ROGUE_MIPSFW_ENTRYLO_GLOBAL_EN; + + return flags; +} + +/** + * pvr_vm_mips_map() - Map a FW object into MIPS address space + * @pvr_dev: Target PowerVR device. + * @fw_obj: FW object to map. + * + * Returns: + * * 0 on success, + * * -%EINVAL if object does not reside within FW address space, or + * * Any error returned by pvr_fw_object_get_dma_addr(). + */ +int +pvr_vm_mips_map(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj) +{ + struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev; + struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data; + struct pvr_gem_object *pvr_obj = fw_obj->gem; + const u64 start = fw_obj->fw_mm_node.start; + const u64 size = fw_obj->fw_mm_node.size; + u64 end; + u32 cache_policy; + u32 pte_flags; + u32 start_pfn; + u32 end_pfn; + s32 pfn; + int err; + + if (check_add_overflow(start, size - 1, &end)) + return -EINVAL; + + if (start < ROGUE_FW_HEAP_BASE || + start >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size || + end < ROGUE_FW_HEAP_BASE || + end >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size || + (start & ROGUE_MIPSFW_PAGE_MASK_4K) || + ((end + 1) & ROGUE_MIPSFW_PAGE_MASK_4K)) + return -EINVAL; + + start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K; + end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K; + + if (pvr_obj->flags & PVR_BO_FW_FLAGS_DEVICE_UNCACHED) + cache_policy = ROGUE_MIPSFW_UNCACHED_CACHE_POLICY; + else + cache_policy = mips_data->cache_policy; + + pte_flags = get_mips_pte_flags(true, true, cache_policy); + + for (pfn = start_pfn; pfn <= end_pfn; pfn++) { + dma_addr_t dma_addr; + u32 pte; + + err = pvr_fw_object_get_dma_addr(fw_obj, + (pfn - start_pfn) << + ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K, + &dma_addr); + if (err) + goto err_unmap_pages; + + pte = ((dma_addr >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K) + << ROGUE_MIPSFW_ENTRYLO_PFN_SHIFT) & mips_data->pfn_mask; + pte |= pte_flags; + + WRITE_ONCE(mips_data->pt[pfn], pte); + } + + pvr_mmu_flush_request_all(pvr_dev); + + return 0; + +err_unmap_pages: + for (; pfn >= start_pfn; pfn--) + WRITE_ONCE(mips_data->pt[pfn], 0); + + pvr_mmu_flush_request_all(pvr_dev); + WARN_ON(pvr_mmu_flush_exec(pvr_dev, true)); + + return err; +} + +/** + * pvr_vm_mips_unmap() - Unmap a FW object into MIPS address space + * @pvr_dev: Target PowerVR device. + * @fw_obj: FW object to unmap. + */ +void +pvr_vm_mips_unmap(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj) +{ + struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev; + struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data; + const u64 start = fw_obj->fw_mm_node.start; + const u64 size = fw_obj->fw_mm_node.size; + const u64 end = start + size; + + const u32 start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >> + ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K; + const u32 end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >> + ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K; + + for (u32 pfn = start_pfn; pfn < end_pfn; pfn++) + WRITE_ONCE(mips_data->pt[pfn], 0); + + pvr_mmu_flush_request_all(pvr_dev); + WARN_ON(pvr_mmu_flush_exec(pvr_dev, true)); +} |