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443448d0 | 1 | /* via_dmablit.c -- PCI DMA BitBlt support for the VIA Unichrome/Pro |
bc5f4523 | 2 | * |
443448d0 DA |
3 | * Copyright (C) 2005 Thomas Hellstrom, All Rights Reserved. |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a | |
6 | * copy of this software and associated documentation files (the "Software"), | |
7 | * to deal in the Software without restriction, including without limitation | |
8 | * the rights to use, copy, modify, merge, publish, distribute, sub license, | |
9 | * and/or sell copies of the Software, and to permit persons to whom the | |
10 | * Software is furnished to do so, subject to the following conditions: | |
11 | * | |
12 | * The above copyright notice and this permission notice (including the | |
13 | * next paragraph) shall be included in all copies or substantial portions | |
14 | * of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
bc5f4523 DA |
19 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
20 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
21 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
443448d0 DA |
22 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
23 | * | |
bc5f4523 | 24 | * Authors: |
443448d0 DA |
25 | * Thomas Hellstrom. |
26 | * Partially based on code obtained from Digeo Inc. | |
27 | */ | |
28 | ||
29 | ||
30 | /* | |
bc5f4523 DA |
31 | * Unmaps the DMA mappings. |
32 | * FIXME: Is this a NoOp on x86? Also | |
33 | * FIXME: What happens if this one is called and a pending blit has previously done | |
34 | * the same DMA mappings? | |
443448d0 DA |
35 | */ |
36 | ||
760285e7 DH |
37 | #include <drm/drmP.h> |
38 | #include <drm/via_drm.h> | |
443448d0 DA |
39 | #include "via_drv.h" |
40 | #include "via_dmablit.h" | |
41 | ||
42 | #include <linux/pagemap.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
443448d0 | 44 | |
d40c8533 DA |
45 | #define VIA_PGDN(x) (((unsigned long)(x)) & PAGE_MASK) |
46 | #define VIA_PGOFF(x) (((unsigned long)(x)) & ~PAGE_MASK) | |
47 | #define VIA_PFN(x) ((unsigned long)(x) >> PAGE_SHIFT) | |
443448d0 DA |
48 | |
49 | typedef struct _drm_via_descriptor { | |
50 | uint32_t mem_addr; | |
51 | uint32_t dev_addr; | |
52 | uint32_t size; | |
53 | uint32_t next; | |
54 | } drm_via_descriptor_t; | |
55 | ||
56 | ||
57 | /* | |
58 | * Unmap a DMA mapping. | |
59 | */ | |
60 | ||
61 | ||
62 | ||
63 | static void | |
64 | via_unmap_blit_from_device(struct pci_dev *pdev, drm_via_sg_info_t *vsg) | |
65 | { | |
66 | int num_desc = vsg->num_desc; | |
67 | unsigned cur_descriptor_page = num_desc / vsg->descriptors_per_page; | |
68 | unsigned descriptor_this_page = num_desc % vsg->descriptors_per_page; | |
bc5f4523 | 69 | drm_via_descriptor_t *desc_ptr = vsg->desc_pages[cur_descriptor_page] + |
443448d0 DA |
70 | descriptor_this_page; |
71 | dma_addr_t next = vsg->chain_start; | |
72 | ||
58c1e85a | 73 | while (num_desc--) { |
443448d0 DA |
74 | if (descriptor_this_page-- == 0) { |
75 | cur_descriptor_page--; | |
76 | descriptor_this_page = vsg->descriptors_per_page - 1; | |
bc5f4523 | 77 | desc_ptr = vsg->desc_pages[cur_descriptor_page] + |
443448d0 DA |
78 | descriptor_this_page; |
79 | } | |
80 | dma_unmap_single(&pdev->dev, next, sizeof(*desc_ptr), DMA_TO_DEVICE); | |
81 | dma_unmap_page(&pdev->dev, desc_ptr->mem_addr, desc_ptr->size, vsg->direction); | |
82 | next = (dma_addr_t) desc_ptr->next; | |
83 | desc_ptr--; | |
84 | } | |
85 | } | |
86 | ||
87 | /* | |
88 | * If mode = 0, count how many descriptors are needed. | |
89 | * If mode = 1, Map the DMA pages for the device, put together and map also the descriptors. | |
90 | * Descriptors are run in reverse order by the hardware because we are not allowed to update the | |
91 | * 'next' field without syncing calls when the descriptor is already mapped. | |
92 | */ | |
93 | ||
94 | static void | |
95 | via_map_blit_for_device(struct pci_dev *pdev, | |
96 | const drm_via_dmablit_t *xfer, | |
bc5f4523 | 97 | drm_via_sg_info_t *vsg, |
443448d0 DA |
98 | int mode) |
99 | { | |
100 | unsigned cur_descriptor_page = 0; | |
101 | unsigned num_descriptors_this_page = 0; | |
102 | unsigned char *mem_addr = xfer->mem_addr; | |
103 | unsigned char *cur_mem; | |
104 | unsigned char *first_addr = (unsigned char *)VIA_PGDN(mem_addr); | |
105 | uint32_t fb_addr = xfer->fb_addr; | |
106 | uint32_t cur_fb; | |
107 | unsigned long line_len; | |
108 | unsigned remaining_len; | |
109 | int num_desc = 0; | |
110 | int cur_line; | |
111 | dma_addr_t next = 0 | VIA_DMA_DPR_EC; | |
339363c4 | 112 | drm_via_descriptor_t *desc_ptr = NULL; |
443448d0 | 113 | |
bc5f4523 | 114 | if (mode == 1) |
443448d0 DA |
115 | desc_ptr = vsg->desc_pages[cur_descriptor_page]; |
116 | ||
117 | for (cur_line = 0; cur_line < xfer->num_lines; ++cur_line) { | |
118 | ||
119 | line_len = xfer->line_length; | |
120 | cur_fb = fb_addr; | |
121 | cur_mem = mem_addr; | |
bc5f4523 | 122 | |
443448d0 DA |
123 | while (line_len > 0) { |
124 | ||
d40c8533 | 125 | remaining_len = min(PAGE_SIZE-VIA_PGOFF(cur_mem), line_len); |
443448d0 DA |
126 | line_len -= remaining_len; |
127 | ||
128 | if (mode == 1) { | |
bc5f4523 DA |
129 | desc_ptr->mem_addr = |
130 | dma_map_page(&pdev->dev, | |
131 | vsg->pages[VIA_PFN(cur_mem) - | |
443448d0 | 132 | VIA_PFN(first_addr)], |
bc5f4523 | 133 | VIA_PGOFF(cur_mem), remaining_len, |
443448d0 | 134 | vsg->direction); |
d40c8533 | 135 | desc_ptr->dev_addr = cur_fb; |
bc5f4523 | 136 | |
d40c8533 | 137 | desc_ptr->size = remaining_len; |
443448d0 | 138 | desc_ptr->next = (uint32_t) next; |
bc5f4523 | 139 | next = dma_map_single(&pdev->dev, desc_ptr, sizeof(*desc_ptr), |
443448d0 DA |
140 | DMA_TO_DEVICE); |
141 | desc_ptr++; | |
142 | if (++num_descriptors_this_page >= vsg->descriptors_per_page) { | |
143 | num_descriptors_this_page = 0; | |
144 | desc_ptr = vsg->desc_pages[++cur_descriptor_page]; | |
145 | } | |
146 | } | |
bc5f4523 | 147 | |
443448d0 DA |
148 | num_desc++; |
149 | cur_mem += remaining_len; | |
150 | cur_fb += remaining_len; | |
151 | } | |
bc5f4523 | 152 | |
443448d0 DA |
153 | mem_addr += xfer->mem_stride; |
154 | fb_addr += xfer->fb_stride; | |
155 | } | |
156 | ||
157 | if (mode == 1) { | |
158 | vsg->chain_start = next; | |
159 | vsg->state = dr_via_device_mapped; | |
160 | } | |
161 | vsg->num_desc = num_desc; | |
162 | } | |
163 | ||
164 | /* | |
bc5f4523 | 165 | * Function that frees up all resources for a blit. It is usable even if the |
d40c8533 | 166 | * blit info has only been partially built as long as the status enum is consistent |
443448d0 DA |
167 | * with the actual status of the used resources. |
168 | */ | |
169 | ||
170 | ||
ce60fe02 | 171 | static void |
bc5f4523 | 172 | via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg) |
443448d0 DA |
173 | { |
174 | struct page *page; | |
175 | int i; | |
176 | ||
58c1e85a | 177 | switch (vsg->state) { |
443448d0 DA |
178 | case dr_via_device_mapped: |
179 | via_unmap_blit_from_device(pdev, vsg); | |
180 | case dr_via_desc_pages_alloc: | |
58c1e85a | 181 | for (i = 0; i < vsg->num_desc_pages; ++i) { |
443448d0 | 182 | if (vsg->desc_pages[i] != NULL) |
58c1e85a | 183 | free_page((unsigned long)vsg->desc_pages[i]); |
443448d0 DA |
184 | } |
185 | kfree(vsg->desc_pages); | |
186 | case dr_via_pages_locked: | |
58c1e85a NK |
187 | for (i = 0; i < vsg->num_pages; ++i) { |
188 | if (NULL != (page = vsg->pages[i])) { | |
189 | if (!PageReserved(page) && (DMA_FROM_DEVICE == vsg->direction)) | |
443448d0 | 190 | SetPageDirty(page); |
09cbfeaf | 191 | put_page(page); |
443448d0 DA |
192 | } |
193 | } | |
194 | case dr_via_pages_alloc: | |
195 | vfree(vsg->pages); | |
196 | default: | |
197 | vsg->state = dr_via_sg_init; | |
198 | } | |
c5c07550 F |
199 | vfree(vsg->bounce_buffer); |
200 | vsg->bounce_buffer = NULL; | |
443448d0 | 201 | vsg->free_on_sequence = 0; |
bc5f4523 | 202 | } |
443448d0 DA |
203 | |
204 | /* | |
205 | * Fire a blit engine. | |
206 | */ | |
207 | ||
208 | static void | |
84b1fd10 | 209 | via_fire_dmablit(struct drm_device *dev, drm_via_sg_info_t *vsg, int engine) |
443448d0 DA |
210 | { |
211 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
212 | ||
213 | VIA_WRITE(VIA_PCI_DMA_MAR0 + engine*0x10, 0); | |
214 | VIA_WRITE(VIA_PCI_DMA_DAR0 + engine*0x10, 0); | |
bc5f4523 | 215 | VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DD | VIA_DMA_CSR_TD | |
443448d0 DA |
216 | VIA_DMA_CSR_DE); |
217 | VIA_WRITE(VIA_PCI_DMA_MR0 + engine*0x04, VIA_DMA_MR_CM | VIA_DMA_MR_TDIE); | |
218 | VIA_WRITE(VIA_PCI_DMA_BCR0 + engine*0x10, 0); | |
219 | VIA_WRITE(VIA_PCI_DMA_DPR0 + engine*0x10, vsg->chain_start); | |
85b2331b | 220 | wmb(); |
443448d0 | 221 | VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DE | VIA_DMA_CSR_TS); |
76f62551 | 222 | VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04); |
443448d0 DA |
223 | } |
224 | ||
225 | /* | |
226 | * Obtain a page pointer array and lock all pages into system memory. A segmentation violation will | |
227 | * occur here if the calling user does not have access to the submitted address. | |
228 | */ | |
229 | ||
230 | static int | |
231 | via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer) | |
232 | { | |
233 | int ret; | |
234 | unsigned long first_pfn = VIA_PFN(xfer->mem_addr); | |
58c1e85a | 235 | vsg->num_pages = VIA_PFN(xfer->mem_addr + (xfer->num_lines * xfer->mem_stride - 1)) - |
443448d0 | 236 | first_pfn + 1; |
bc5f4523 | 237 | |
ec3789cc JP |
238 | vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages); |
239 | if (NULL == vsg->pages) | |
20caafa6 | 240 | return -ENOMEM; |
a6e0d12f AV |
241 | ret = get_user_pages_fast((unsigned long)xfer->mem_addr, |
242 | vsg->num_pages, vsg->direction == DMA_FROM_DEVICE, | |
243 | vsg->pages); | |
443448d0 | 244 | if (ret != vsg->num_pages) { |
bc5f4523 | 245 | if (ret < 0) |
443448d0 DA |
246 | return ret; |
247 | vsg->state = dr_via_pages_locked; | |
20caafa6 | 248 | return -EINVAL; |
443448d0 DA |
249 | } |
250 | vsg->state = dr_via_pages_locked; | |
251 | DRM_DEBUG("DMA pages locked\n"); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Allocate DMA capable memory for the blit descriptor chain, and an array that keeps track of the | |
257 | * pages we allocate. We don't want to use kmalloc for the descriptor chain because it may be | |
e1c05067 | 258 | * quite large for some blits, and pages don't need to be contiguous. |
443448d0 DA |
259 | */ |
260 | ||
bc5f4523 | 261 | static int |
443448d0 DA |
262 | via_alloc_desc_pages(drm_via_sg_info_t *vsg) |
263 | { | |
264 | int i; | |
bc5f4523 | 265 | |
58c1e85a | 266 | vsg->descriptors_per_page = PAGE_SIZE / sizeof(drm_via_descriptor_t); |
bc5f4523 | 267 | vsg->num_desc_pages = (vsg->num_desc + vsg->descriptors_per_page - 1) / |
443448d0 DA |
268 | vsg->descriptors_per_page; |
269 | ||
dd00cc48 | 270 | if (NULL == (vsg->desc_pages = kcalloc(vsg->num_desc_pages, sizeof(void *), GFP_KERNEL))) |
20caafa6 | 271 | return -ENOMEM; |
bc5f4523 | 272 | |
443448d0 | 273 | vsg->state = dr_via_desc_pages_alloc; |
58c1e85a | 274 | for (i = 0; i < vsg->num_desc_pages; ++i) { |
bc5f4523 | 275 | if (NULL == (vsg->desc_pages[i] = |
443448d0 | 276 | (drm_via_descriptor_t *) __get_free_page(GFP_KERNEL))) |
20caafa6 | 277 | return -ENOMEM; |
443448d0 DA |
278 | } |
279 | DRM_DEBUG("Allocated %d pages for %d descriptors.\n", vsg->num_desc_pages, | |
280 | vsg->num_desc); | |
281 | return 0; | |
282 | } | |
bc5f4523 | 283 | |
443448d0 | 284 | static void |
84b1fd10 | 285 | via_abort_dmablit(struct drm_device *dev, int engine) |
443448d0 DA |
286 | { |
287 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
288 | ||
289 | VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TA); | |
290 | } | |
291 | ||
292 | static void | |
84b1fd10 | 293 | via_dmablit_engine_off(struct drm_device *dev, int engine) |
443448d0 DA |
294 | { |
295 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
296 | ||
bc5f4523 | 297 | VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD | VIA_DMA_CSR_DD); |
443448d0 DA |
298 | } |
299 | ||
300 | ||
301 | ||
302 | /* | |
303 | * The dmablit part of the IRQ handler. Trying to do only reasonably fast things here. | |
304 | * The rest, like unmapping and freeing memory for done blits is done in a separate workqueue | |
305 | * task. Basically the task of the interrupt handler is to submit a new blit to the engine, while | |
306 | * the workqueue task takes care of processing associated with the old blit. | |
307 | */ | |
bc5f4523 | 308 | |
443448d0 | 309 | void |
84b1fd10 | 310 | via_dmablit_handler(struct drm_device *dev, int engine, int from_irq) |
443448d0 DA |
311 | { |
312 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
313 | drm_via_blitq_t *blitq = dev_priv->blit_queues + engine; | |
314 | int cur; | |
315 | int done_transfer; | |
58c1e85a | 316 | unsigned long irqsave = 0; |
443448d0 DA |
317 | uint32_t status = 0; |
318 | ||
319 | DRM_DEBUG("DMA blit handler called. engine = %d, from_irq = %d, blitq = 0x%lx\n", | |
320 | engine, from_irq, (unsigned long) blitq); | |
321 | ||
58c1e85a | 322 | if (from_irq) |
443448d0 | 323 | spin_lock(&blitq->blit_lock); |
58c1e85a | 324 | else |
443448d0 | 325 | spin_lock_irqsave(&blitq->blit_lock, irqsave); |
443448d0 | 326 | |
bc5f4523 | 327 | done_transfer = blitq->is_active && |
58c1e85a NK |
328 | ((status = VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04)) & VIA_DMA_CSR_TD); |
329 | done_transfer = done_transfer || (blitq->aborting && !(status & VIA_DMA_CSR_DE)); | |
443448d0 DA |
330 | |
331 | cur = blitq->cur; | |
332 | if (done_transfer) { | |
333 | ||
334 | blitq->blits[cur]->aborted = blitq->aborting; | |
335 | blitq->done_blit_handle++; | |
57ed0f7b | 336 | wake_up(blitq->blit_queue + cur); |
443448d0 DA |
337 | |
338 | cur++; | |
bc5f4523 | 339 | if (cur >= VIA_NUM_BLIT_SLOTS) |
443448d0 DA |
340 | cur = 0; |
341 | blitq->cur = cur; | |
342 | ||
343 | /* | |
344 | * Clear transfer done flag. | |
345 | */ | |
346 | ||
347 | VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD); | |
348 | ||
349 | blitq->is_active = 0; | |
350 | blitq->aborting = 0; | |
bc5f4523 | 351 | schedule_work(&blitq->wq); |
443448d0 DA |
352 | |
353 | } else if (blitq->is_active && time_after_eq(jiffies, blitq->end)) { | |
354 | ||
355 | /* | |
356 | * Abort transfer after one second. | |
357 | */ | |
358 | ||
359 | via_abort_dmablit(dev, engine); | |
360 | blitq->aborting = 1; | |
bfd8303a | 361 | blitq->end = jiffies + HZ; |
443448d0 | 362 | } |
bc5f4523 | 363 | |
443448d0 DA |
364 | if (!blitq->is_active) { |
365 | if (blitq->num_outstanding) { | |
366 | via_fire_dmablit(dev, blitq->blits[cur], engine); | |
367 | blitq->is_active = 1; | |
368 | blitq->cur = cur; | |
369 | blitq->num_outstanding--; | |
bfd8303a | 370 | blitq->end = jiffies + HZ; |
40565f19 JS |
371 | if (!timer_pending(&blitq->poll_timer)) |
372 | mod_timer(&blitq->poll_timer, jiffies + 1); | |
443448d0 | 373 | } else { |
58c1e85a | 374 | if (timer_pending(&blitq->poll_timer)) |
443448d0 | 375 | del_timer(&blitq->poll_timer); |
443448d0 DA |
376 | via_dmablit_engine_off(dev, engine); |
377 | } | |
bc5f4523 | 378 | } |
443448d0 | 379 | |
58c1e85a | 380 | if (from_irq) |
443448d0 | 381 | spin_unlock(&blitq->blit_lock); |
58c1e85a | 382 | else |
443448d0 | 383 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); |
bc5f4523 | 384 | } |
443448d0 DA |
385 | |
386 | ||
387 | ||
388 | /* | |
389 | * Check whether this blit is still active, performing necessary locking. | |
390 | */ | |
391 | ||
392 | static int | |
393 | via_dmablit_active(drm_via_blitq_t *blitq, int engine, uint32_t handle, wait_queue_head_t **queue) | |
394 | { | |
395 | unsigned long irqsave; | |
396 | uint32_t slot; | |
397 | int active; | |
398 | ||
399 | spin_lock_irqsave(&blitq->blit_lock, irqsave); | |
400 | ||
401 | /* | |
402 | * Allow for handle wraparounds. | |
403 | */ | |
404 | ||
405 | active = ((blitq->done_blit_handle - handle) > (1 << 23)) && | |
406 | ((blitq->cur_blit_handle - handle) <= (1 << 23)); | |
407 | ||
408 | if (queue && active) { | |
58c1e85a NK |
409 | slot = handle - blitq->done_blit_handle + blitq->cur - 1; |
410 | if (slot >= VIA_NUM_BLIT_SLOTS) | |
443448d0 | 411 | slot -= VIA_NUM_BLIT_SLOTS; |
443448d0 DA |
412 | *queue = blitq->blit_queue + slot; |
413 | } | |
414 | ||
415 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); | |
416 | ||
417 | return active; | |
418 | } | |
bc5f4523 | 419 | |
443448d0 DA |
420 | /* |
421 | * Sync. Wait for at least three seconds for the blit to be performed. | |
422 | */ | |
423 | ||
424 | static int | |
bc5f4523 | 425 | via_dmablit_sync(struct drm_device *dev, uint32_t handle, int engine) |
443448d0 DA |
426 | { |
427 | ||
428 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
429 | drm_via_blitq_t *blitq = dev_priv->blit_queues + engine; | |
430 | wait_queue_head_t *queue; | |
431 | int ret = 0; | |
432 | ||
433 | if (via_dmablit_active(blitq, engine, handle, &queue)) { | |
bfd8303a | 434 | DRM_WAIT_ON(ret, *queue, 3 * HZ, |
443448d0 DA |
435 | !via_dmablit_active(blitq, engine, handle, NULL)); |
436 | } | |
437 | DRM_DEBUG("DMA blit sync handle 0x%x engine %d returned %d\n", | |
438 | handle, engine, ret); | |
bc5f4523 | 439 | |
443448d0 DA |
440 | return ret; |
441 | } | |
442 | ||
443 | ||
444 | /* | |
445 | * A timer that regularly polls the blit engine in cases where we don't have interrupts: | |
446 | * a) Broken hardware (typically those that don't have any video capture facility). | |
447 | * b) Blit abort. The hardware doesn't send an interrupt when a blit is aborted. | |
448 | * The timer and hardware IRQ's can and do work in parallel. If the hardware has | |
449 | * irqs, it will shorten the latency somewhat. | |
450 | */ | |
451 | ||
452 | ||
453 | ||
454 | static void | |
e99e88a9 | 455 | via_dmablit_timer(struct timer_list *t) |
443448d0 | 456 | { |
e99e88a9 | 457 | drm_via_blitq_t *blitq = from_timer(blitq, t, poll_timer); |
84b1fd10 | 458 | struct drm_device *dev = blitq->dev; |
443448d0 DA |
459 | int engine = (int) |
460 | (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues); | |
bc5f4523 DA |
461 | |
462 | DRM_DEBUG("Polling timer called for engine %d, jiffies %lu\n", engine, | |
443448d0 DA |
463 | (unsigned long) jiffies); |
464 | ||
465 | via_dmablit_handler(dev, engine, 0); | |
bc5f4523 | 466 | |
443448d0 | 467 | if (!timer_pending(&blitq->poll_timer)) { |
40565f19 | 468 | mod_timer(&blitq->poll_timer, jiffies + 1); |
443448d0 | 469 | |
d40c8533 DA |
470 | /* |
471 | * Rerun handler to delete timer if engines are off, and | |
472 | * to shorten abort latency. This is a little nasty. | |
473 | */ | |
474 | ||
475 | via_dmablit_handler(dev, engine, 0); | |
476 | ||
477 | } | |
443448d0 DA |
478 | } |
479 | ||
480 | ||
481 | ||
482 | ||
483 | /* | |
484 | * Workqueue task that frees data and mappings associated with a blit. | |
485 | * Also wakes up waiting processes. Each of these tasks handles one | |
486 | * blit engine only and may not be called on each interrupt. | |
487 | */ | |
488 | ||
489 | ||
bc5f4523 | 490 | static void |
c4028958 | 491 | via_dmablit_workqueue(struct work_struct *work) |
443448d0 | 492 | { |
c4028958 | 493 | drm_via_blitq_t *blitq = container_of(work, drm_via_blitq_t, wq); |
84b1fd10 | 494 | struct drm_device *dev = blitq->dev; |
443448d0 DA |
495 | unsigned long irqsave; |
496 | drm_via_sg_info_t *cur_sg; | |
497 | int cur_released; | |
bc5f4523 DA |
498 | |
499 | ||
58c1e85a | 500 | DRM_DEBUG("Workqueue task called for blit engine %ld\n", (unsigned long) |
443448d0 DA |
501 | (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues)); |
502 | ||
503 | spin_lock_irqsave(&blitq->blit_lock, irqsave); | |
bc5f4523 | 504 | |
58c1e85a | 505 | while (blitq->serviced != blitq->cur) { |
443448d0 DA |
506 | |
507 | cur_released = blitq->serviced++; | |
508 | ||
509 | DRM_DEBUG("Releasing blit slot %d\n", cur_released); | |
510 | ||
bc5f4523 | 511 | if (blitq->serviced >= VIA_NUM_BLIT_SLOTS) |
443448d0 | 512 | blitq->serviced = 0; |
bc5f4523 | 513 | |
443448d0 DA |
514 | cur_sg = blitq->blits[cur_released]; |
515 | blitq->num_free++; | |
bc5f4523 | 516 | |
443448d0 | 517 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); |
bc5f4523 | 518 | |
57ed0f7b | 519 | wake_up(&blitq->busy_queue); |
bc5f4523 | 520 | |
443448d0 DA |
521 | via_free_sg_info(dev->pdev, cur_sg); |
522 | kfree(cur_sg); | |
bc5f4523 | 523 | |
443448d0 DA |
524 | spin_lock_irqsave(&blitq->blit_lock, irqsave); |
525 | } | |
526 | ||
527 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); | |
528 | } | |
bc5f4523 | 529 | |
443448d0 DA |
530 | |
531 | /* | |
532 | * Init all blit engines. Currently we use two, but some hardware have 4. | |
533 | */ | |
534 | ||
535 | ||
536 | void | |
84b1fd10 | 537 | via_init_dmablit(struct drm_device *dev) |
443448d0 | 538 | { |
58c1e85a | 539 | int i, j; |
443448d0 DA |
540 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; |
541 | drm_via_blitq_t *blitq; | |
542 | ||
bc5f4523 DA |
543 | pci_set_master(dev->pdev); |
544 | ||
58c1e85a | 545 | for (i = 0; i < VIA_NUM_BLIT_ENGINES; ++i) { |
443448d0 DA |
546 | blitq = dev_priv->blit_queues + i; |
547 | blitq->dev = dev; | |
548 | blitq->cur_blit_handle = 0; | |
549 | blitq->done_blit_handle = 0; | |
550 | blitq->head = 0; | |
551 | blitq->cur = 0; | |
552 | blitq->serviced = 0; | |
22c806c2 | 553 | blitq->num_free = VIA_NUM_BLIT_SLOTS - 1; |
443448d0 DA |
554 | blitq->num_outstanding = 0; |
555 | blitq->is_active = 0; | |
556 | blitq->aborting = 0; | |
34af946a | 557 | spin_lock_init(&blitq->blit_lock); |
58c1e85a | 558 | for (j = 0; j < VIA_NUM_BLIT_SLOTS; ++j) |
57ed0f7b DV |
559 | init_waitqueue_head(blitq->blit_queue + j); |
560 | init_waitqueue_head(&blitq->busy_queue); | |
c4028958 | 561 | INIT_WORK(&blitq->wq, via_dmablit_workqueue); |
e99e88a9 | 562 | timer_setup(&blitq->poll_timer, via_dmablit_timer, 0); |
bc5f4523 | 563 | } |
443448d0 DA |
564 | } |
565 | ||
566 | /* | |
567 | * Build all info and do all mappings required for a blit. | |
568 | */ | |
bc5f4523 | 569 | |
443448d0 DA |
570 | |
571 | static int | |
84b1fd10 | 572 | via_build_sg_info(struct drm_device *dev, drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer) |
443448d0 DA |
573 | { |
574 | int draw = xfer->to_fb; | |
575 | int ret = 0; | |
bc5f4523 | 576 | |
443448d0 | 577 | vsg->direction = (draw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; |
339363c4 | 578 | vsg->bounce_buffer = NULL; |
443448d0 DA |
579 | |
580 | vsg->state = dr_via_sg_init; | |
581 | ||
582 | if (xfer->num_lines <= 0 || xfer->line_length <= 0) { | |
583 | DRM_ERROR("Zero size bitblt.\n"); | |
20caafa6 | 584 | return -EINVAL; |
443448d0 DA |
585 | } |
586 | ||
587 | /* | |
588 | * Below check is a driver limitation, not a hardware one. We | |
589 | * don't want to lock unused pages, and don't want to incoporate the | |
bc5f4523 | 590 | * extra logic of avoiding them. Make sure there are no. |
443448d0 DA |
591 | * (Not a big limitation anyway.) |
592 | */ | |
593 | ||
f0fb6d77 | 594 | if ((xfer->mem_stride - xfer->line_length) > 2*PAGE_SIZE) { |
443448d0 DA |
595 | DRM_ERROR("Too large system memory stride. Stride: %d, " |
596 | "Length: %d\n", xfer->mem_stride, xfer->line_length); | |
20caafa6 | 597 | return -EINVAL; |
443448d0 DA |
598 | } |
599 | ||
d40c8533 DA |
600 | if ((xfer->mem_stride == xfer->line_length) && |
601 | (xfer->fb_stride == xfer->line_length)) { | |
602 | xfer->mem_stride *= xfer->num_lines; | |
603 | xfer->line_length = xfer->mem_stride; | |
604 | xfer->fb_stride = xfer->mem_stride; | |
605 | xfer->num_lines = 1; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Don't lock an arbitrary large number of pages, since that causes a | |
610 | * DOS security hole. | |
611 | */ | |
612 | ||
613 | if (xfer->num_lines > 2048 || (xfer->num_lines*xfer->mem_stride > (2048*2048*4))) { | |
614 | DRM_ERROR("Too large PCI DMA bitblt.\n"); | |
20caafa6 | 615 | return -EINVAL; |
bc5f4523 | 616 | } |
443448d0 | 617 | |
bc5f4523 | 618 | /* |
443448d0 | 619 | * we allow a negative fb stride to allow flipping of images in |
bc5f4523 | 620 | * transfer. |
443448d0 DA |
621 | */ |
622 | ||
623 | if (xfer->mem_stride < xfer->line_length || | |
624 | abs(xfer->fb_stride) < xfer->line_length) { | |
625 | DRM_ERROR("Invalid frame-buffer / memory stride.\n"); | |
20caafa6 | 626 | return -EINVAL; |
443448d0 DA |
627 | } |
628 | ||
629 | /* | |
630 | * A hardware bug seems to be worked around if system memory addresses start on | |
631 | * 16 byte boundaries. This seems a bit restrictive however. VIA is contacted | |
632 | * about this. Meanwhile, impose the following restrictions: | |
633 | */ | |
634 | ||
635 | #ifdef VIA_BUGFREE | |
636 | if ((((unsigned long)xfer->mem_addr & 3) != ((unsigned long)xfer->fb_addr & 3)) || | |
d40c8533 | 637 | ((xfer->num_lines > 1) && ((xfer->mem_stride & 3) != (xfer->fb_stride & 3)))) { |
443448d0 | 638 | DRM_ERROR("Invalid DRM bitblt alignment.\n"); |
20caafa6 | 639 | return -EINVAL; |
443448d0 DA |
640 | } |
641 | #else | |
642 | if ((((unsigned long)xfer->mem_addr & 15) || | |
d40c8533 | 643 | ((unsigned long)xfer->fb_addr & 3)) || |
bc5f4523 | 644 | ((xfer->num_lines > 1) && |
d40c8533 | 645 | ((xfer->mem_stride & 15) || (xfer->fb_stride & 3)))) { |
443448d0 | 646 | DRM_ERROR("Invalid DRM bitblt alignment.\n"); |
20caafa6 | 647 | return -EINVAL; |
bc5f4523 | 648 | } |
443448d0 DA |
649 | #endif |
650 | ||
651 | if (0 != (ret = via_lock_all_dma_pages(vsg, xfer))) { | |
652 | DRM_ERROR("Could not lock DMA pages.\n"); | |
653 | via_free_sg_info(dev->pdev, vsg); | |
654 | return ret; | |
655 | } | |
656 | ||
657 | via_map_blit_for_device(dev->pdev, xfer, vsg, 0); | |
658 | if (0 != (ret = via_alloc_desc_pages(vsg))) { | |
659 | DRM_ERROR("Could not allocate DMA descriptor pages.\n"); | |
660 | via_free_sg_info(dev->pdev, vsg); | |
661 | return ret; | |
662 | } | |
663 | via_map_blit_for_device(dev->pdev, xfer, vsg, 1); | |
bc5f4523 | 664 | |
443448d0 DA |
665 | return 0; |
666 | } | |
bc5f4523 | 667 | |
443448d0 DA |
668 | |
669 | /* | |
670 | * Reserve one free slot in the blit queue. Will wait for one second for one | |
671 | * to become available. Otherwise -EBUSY is returned. | |
672 | */ | |
673 | ||
bc5f4523 | 674 | static int |
443448d0 DA |
675 | via_dmablit_grab_slot(drm_via_blitq_t *blitq, int engine) |
676 | { | |
58c1e85a | 677 | int ret = 0; |
443448d0 DA |
678 | unsigned long irqsave; |
679 | ||
680 | DRM_DEBUG("Num free is %d\n", blitq->num_free); | |
681 | spin_lock_irqsave(&blitq->blit_lock, irqsave); | |
58c1e85a | 682 | while (blitq->num_free == 0) { |
443448d0 DA |
683 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); |
684 | ||
bfd8303a | 685 | DRM_WAIT_ON(ret, blitq->busy_queue, HZ, blitq->num_free > 0); |
58c1e85a | 686 | if (ret) |
20caafa6 | 687 | return (-EINTR == ret) ? -EAGAIN : ret; |
bc5f4523 | 688 | |
443448d0 DA |
689 | spin_lock_irqsave(&blitq->blit_lock, irqsave); |
690 | } | |
bc5f4523 | 691 | |
443448d0 DA |
692 | blitq->num_free--; |
693 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Hand back a free slot if we changed our mind. | |
700 | */ | |
701 | ||
bc5f4523 | 702 | static void |
443448d0 DA |
703 | via_dmablit_release_slot(drm_via_blitq_t *blitq) |
704 | { | |
705 | unsigned long irqsave; | |
706 | ||
707 | spin_lock_irqsave(&blitq->blit_lock, irqsave); | |
708 | blitq->num_free++; | |
709 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); | |
57ed0f7b | 710 | wake_up(&blitq->busy_queue); |
443448d0 DA |
711 | } |
712 | ||
713 | /* | |
714 | * Grab a free slot. Build blit info and queue a blit. | |
715 | */ | |
716 | ||
717 | ||
bc5f4523 DA |
718 | static int |
719 | via_dmablit(struct drm_device *dev, drm_via_dmablit_t *xfer) | |
443448d0 DA |
720 | { |
721 | drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; | |
722 | drm_via_sg_info_t *vsg; | |
723 | drm_via_blitq_t *blitq; | |
d40c8533 | 724 | int ret; |
443448d0 DA |
725 | int engine; |
726 | unsigned long irqsave; | |
727 | ||
728 | if (dev_priv == NULL) { | |
729 | DRM_ERROR("Called without initialization.\n"); | |
20caafa6 | 730 | return -EINVAL; |
443448d0 DA |
731 | } |
732 | ||
733 | engine = (xfer->to_fb) ? 0 : 1; | |
734 | blitq = dev_priv->blit_queues + engine; | |
58c1e85a | 735 | if (0 != (ret = via_dmablit_grab_slot(blitq, engine))) |
443448d0 | 736 | return ret; |
443448d0 DA |
737 | if (NULL == (vsg = kmalloc(sizeof(*vsg), GFP_KERNEL))) { |
738 | via_dmablit_release_slot(blitq); | |
20caafa6 | 739 | return -ENOMEM; |
443448d0 DA |
740 | } |
741 | if (0 != (ret = via_build_sg_info(dev, vsg, xfer))) { | |
742 | via_dmablit_release_slot(blitq); | |
743 | kfree(vsg); | |
744 | return ret; | |
745 | } | |
746 | spin_lock_irqsave(&blitq->blit_lock, irqsave); | |
747 | ||
748 | blitq->blits[blitq->head++] = vsg; | |
bc5f4523 | 749 | if (blitq->head >= VIA_NUM_BLIT_SLOTS) |
443448d0 DA |
750 | blitq->head = 0; |
751 | blitq->num_outstanding++; | |
bc5f4523 | 752 | xfer->sync.sync_handle = ++blitq->cur_blit_handle; |
443448d0 DA |
753 | |
754 | spin_unlock_irqrestore(&blitq->blit_lock, irqsave); | |
755 | xfer->sync.engine = engine; | |
756 | ||
bc5f4523 | 757 | via_dmablit_handler(dev, engine, 0); |
443448d0 DA |
758 | |
759 | return 0; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Sync on a previously submitted blit. Note that the X server use signals extensively, and | |
d40c8533 | 764 | * that there is a very big probability that this IOCTL will be interrupted by a signal. In that |
bc5f4523 | 765 | * case it returns with -EAGAIN for the signal to be delivered. |
443448d0 DA |
766 | * The caller should then reissue the IOCTL. This is similar to what is being done for drmGetLock(). |
767 | */ | |
768 | ||
769 | int | |
58c1e85a | 770 | via_dma_blit_sync(struct drm_device *dev, void *data, struct drm_file *file_priv) |
443448d0 | 771 | { |
c153f45f | 772 | drm_via_blitsync_t *sync = data; |
443448d0 | 773 | int err; |
443448d0 | 774 | |
bc5f4523 | 775 | if (sync->engine >= VIA_NUM_BLIT_ENGINES) |
20caafa6 | 776 | return -EINVAL; |
443448d0 | 777 | |
c153f45f | 778 | err = via_dmablit_sync(dev, sync->sync_handle, sync->engine); |
443448d0 | 779 | |
20caafa6 EA |
780 | if (-EINTR == err) |
781 | err = -EAGAIN; | |
443448d0 DA |
782 | |
783 | return err; | |
784 | } | |
bc5f4523 | 785 | |
443448d0 DA |
786 | |
787 | /* | |
788 | * Queue a blit and hand back a handle to be used for sync. This IOCTL may be interrupted by a signal | |
bc5f4523 | 789 | * while waiting for a free slot in the blit queue. In that case it returns with -EAGAIN and should |
443448d0 DA |
790 | * be reissued. See the above IOCTL code. |
791 | */ | |
792 | ||
bc5f4523 | 793 | int |
58c1e85a | 794 | via_dma_blit(struct drm_device *dev, void *data, struct drm_file *file_priv) |
443448d0 | 795 | { |
c153f45f | 796 | drm_via_dmablit_t *xfer = data; |
443448d0 | 797 | int err; |
443448d0 | 798 | |
c153f45f | 799 | err = via_dmablit(dev, xfer); |
443448d0 DA |
800 | |
801 | return err; | |
802 | } |