1// SPDX-License-Identifier: GPL-2.0-only OR MIT
2/* Copyright (c) 2023 Imagination Technologies Ltd. */
3
4#include "pvr_device.h"
5#include "pvr_fw_mips.h"
6#include "pvr_gem.h"
7#include "pvr_mmu.h"
8#include "pvr_rogue_mips.h"
9#include "pvr_vm.h"
10#include "pvr_vm_mips.h"
11
12#include <drm/drm_managed.h>
13#include <linux/dma-mapping.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/types.h>
17#include <linux/vmalloc.h>
18
19/**
20 * pvr_vm_mips_init() - Initialise MIPS FW pagetable
21 * @pvr_dev: Target PowerVR device.
22 *
23 * Returns:
24 * * 0 on success,
25 * * -%EINVAL,
26 * * Any error returned by pvr_gem_object_create(), or
27 * * And error returned by pvr_gem_object_vmap().
28 */
29int
30pvr_vm_mips_init(struct pvr_device *pvr_dev)
31{
32 u32 pt_size = 1 << ROGUE_MIPSFW_LOG2_PAGETABLE_SIZE_4K(pvr_dev);
33 struct device *dev = from_pvr_device(pvr_dev)->dev;
34 struct pvr_fw_mips_data *mips_data;
35 u32 phys_bus_width;
36 int page_nr;
37 int err;
38
39 /* Page table size must be at most ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * 4k pages. */
40 if (pt_size > ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * SZ_4K)
41 return -EINVAL;
42
43 if (PVR_FEATURE_VALUE(pvr_dev, phys_bus_width, &phys_bus_width))
44 return -EINVAL;
45
46 mips_data = drmm_kzalloc(from_pvr_device(pvr_dev), size: sizeof(*mips_data), GFP_KERNEL);
47 if (!mips_data)
48 return -ENOMEM;
49
50 for (page_nr = 0; page_nr < PVR_MIPS_PT_PAGE_COUNT; page_nr++) {
51 mips_data->pt_pages[page_nr] = alloc_page(GFP_KERNEL | __GFP_ZERO);
52 if (!mips_data->pt_pages[page_nr]) {
53 err = -ENOMEM;
54 goto err_free_pages;
55 }
56
57 mips_data->pt_dma_addr[page_nr] = dma_map_page(dev, mips_data->pt_pages[page_nr], 0,
58 PAGE_SIZE, DMA_TO_DEVICE);
59 if (dma_mapping_error(dev, dma_addr: mips_data->pt_dma_addr[page_nr])) {
60 err = -ENOMEM;
61 __free_page(mips_data->pt_pages[page_nr]);
62 goto err_free_pages;
63 }
64 }
65
66 mips_data->pt = vmap(pages: mips_data->pt_pages, count: pt_size >> PAGE_SHIFT, VM_MAP,
67 pgprot_writecombine(PAGE_KERNEL));
68 if (!mips_data->pt) {
69 err = -ENOMEM;
70 goto err_free_pages;
71 }
72
73 mips_data->pfn_mask = (phys_bus_width > 32) ? ROGUE_MIPSFW_ENTRYLO_PFN_MASK_ABOVE_32BIT :
74 ROGUE_MIPSFW_ENTRYLO_PFN_MASK;
75
76 mips_data->cache_policy = (phys_bus_width > 32) ? ROGUE_MIPSFW_CACHED_POLICY_ABOVE_32BIT :
77 ROGUE_MIPSFW_CACHED_POLICY;
78
79 pvr_dev->fw_dev.processor_data.mips_data = mips_data;
80
81 return 0;
82
83err_free_pages:
84 while (--page_nr >= 0) {
85 dma_unmap_page(from_pvr_device(pvr_dev)->dev,
86 mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE);
87
88 __free_page(mips_data->pt_pages[page_nr]);
89 }
90
91 return err;
92}
93
94/**
95 * pvr_vm_mips_fini() - Release MIPS FW pagetable
96 * @pvr_dev: Target PowerVR device.
97 */
98void
99pvr_vm_mips_fini(struct pvr_device *pvr_dev)
100{
101 struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
102 struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
103
104 vunmap(addr: mips_data->pt);
105 for (int page_nr = PVR_MIPS_PT_PAGE_COUNT - 1; page_nr >= 0; page_nr--) {
106 dma_unmap_page(from_pvr_device(pvr_dev)->dev,
107 mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE);
108
109 __free_page(mips_data->pt_pages[page_nr]);
110 }
111
112 fw_dev->processor_data.mips_data = NULL;
113}
114
115static u32
116get_mips_pte_flags(bool read, bool write, u32 cache_policy)
117{
118 u32 flags = 0;
119
120 if (read && write) /* Read/write. */
121 flags |= ROGUE_MIPSFW_ENTRYLO_DIRTY_EN;
122 else if (write) /* Write only. */
123 flags |= ROGUE_MIPSFW_ENTRYLO_READ_INHIBIT_EN;
124 else
125 WARN_ON(!read);
126
127 flags |= cache_policy << ROGUE_MIPSFW_ENTRYLO_CACHE_POLICY_SHIFT;
128
129 flags |= ROGUE_MIPSFW_ENTRYLO_VALID_EN | ROGUE_MIPSFW_ENTRYLO_GLOBAL_EN;
130
131 return flags;
132}
133
134/**
135 * pvr_vm_mips_map() - Map a FW object into MIPS address space
136 * @pvr_dev: Target PowerVR device.
137 * @fw_obj: FW object to map.
138 *
139 * Returns:
140 * * 0 on success,
141 * * -%EINVAL if object does not reside within FW address space, or
142 * * Any error returned by pvr_fw_object_get_dma_addr().
143 */
144int
145pvr_vm_mips_map(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj)
146{
147 struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
148 struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
149 struct pvr_gem_object *pvr_obj = fw_obj->gem;
150 const u64 start = fw_obj->fw_mm_node.start;
151 const u64 size = fw_obj->fw_mm_node.size;
152 u64 end;
153 u32 cache_policy;
154 u32 pte_flags;
155 s32 start_pfn;
156 s32 end_pfn;
157 s32 pfn;
158 int err;
159
160 if (check_add_overflow(start, size - 1, &end))
161 return -EINVAL;
162
163 if (start < ROGUE_FW_HEAP_BASE ||
164 start >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size ||
165 end < ROGUE_FW_HEAP_BASE ||
166 end >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size ||
167 (start & ROGUE_MIPSFW_PAGE_MASK_4K) ||
168 ((end + 1) & ROGUE_MIPSFW_PAGE_MASK_4K))
169 return -EINVAL;
170
171 start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
172 end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
173
174 if (pvr_obj->flags & PVR_BO_FW_FLAGS_DEVICE_UNCACHED)
175 cache_policy = ROGUE_MIPSFW_UNCACHED_CACHE_POLICY;
176 else
177 cache_policy = mips_data->cache_policy;
178
179 pte_flags = get_mips_pte_flags(read: true, write: true, cache_policy);
180
181 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
182 dma_addr_t dma_addr;
183 u32 pte;
184
185 err = pvr_fw_object_get_dma_addr(fw_obj,
186 offset: (pfn - start_pfn) <<
187 ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K,
188 dma_addr_out: &dma_addr);
189 if (err)
190 goto err_unmap_pages;
191
192 pte = ((dma_addr >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K)
193 << ROGUE_MIPSFW_ENTRYLO_PFN_SHIFT) & mips_data->pfn_mask;
194 pte |= pte_flags;
195
196 WRITE_ONCE(mips_data->pt[pfn], pte);
197 }
198
199 pvr_mmu_flush_request_all(pvr_dev);
200
201 return 0;
202
203err_unmap_pages:
204 while (--pfn >= start_pfn)
205 WRITE_ONCE(mips_data->pt[pfn], 0);
206
207 pvr_mmu_flush_request_all(pvr_dev);
208 WARN_ON(pvr_mmu_flush_exec(pvr_dev, true));
209
210 return err;
211}
212
213/**
214 * pvr_vm_mips_unmap() - Unmap a FW object into MIPS address space
215 * @pvr_dev: Target PowerVR device.
216 * @fw_obj: FW object to unmap.
217 */
218void
219pvr_vm_mips_unmap(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj)
220{
221 struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
222 struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
223 const u64 start = fw_obj->fw_mm_node.start;
224 const u64 size = fw_obj->fw_mm_node.size;
225 const u64 end = start + size;
226
227 const u32 start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >>
228 ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
229 const u32 end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >>
230 ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
231
232 for (u32 pfn = start_pfn; pfn < end_pfn; pfn++)
233 WRITE_ONCE(mips_data->pt[pfn], 0);
234
235 pvr_mmu_flush_request_all(pvr_dev);
236 WARN_ON(pvr_mmu_flush_exec(pvr_dev, true));
237}
238

source code of linux/drivers/gpu/drm/imagination/pvr_vm_mips.c