2 * QEMU IDE Emulation: PCI Bus support.
4 * Copyright (c) 2003 Fabrice Bellard
5 * Copyright (c) 2006 Openedhand Ltd.
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 #include "block_int.h"
34 #include <hw/ide/pci.h>
36 #define BMDMA_PAGE_SIZE 4096
38 static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
39 BlockDriverCompletionFunc *dma_cb)
41 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
48 bm->sector_num = ide_get_sector(s);
49 bm->nsector = s->nsector;
51 if (bm->status & BM_STATUS_DMAING) {
52 bm->dma_cb(bmdma_active_if(bm), 0);
56 /* return 0 if buffer completed */
57 static int bmdma_prepare_buf(IDEDMA *dma, int is_write)
59 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
60 IDEState *s = bmdma_active_if(bm);
67 qemu_sglist_init(&s->sg, s->nsector / (BMDMA_PAGE_SIZE / 512) + 1);
68 s->io_buffer_size = 0;
70 if (bm->cur_prd_len == 0) {
71 /* end of table (with a fail safe of one page) */
72 if (bm->cur_prd_last ||
73 (bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
74 return s->io_buffer_size != 0;
75 cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
77 prd.addr = le32_to_cpu(prd.addr);
78 prd.size = le32_to_cpu(prd.size);
79 len = prd.size & 0xfffe;
82 bm->cur_prd_len = len;
83 bm->cur_prd_addr = prd.addr;
84 bm->cur_prd_last = (prd.size & 0x80000000);
88 qemu_sglist_add(&s->sg, bm->cur_prd_addr, l);
89 bm->cur_prd_addr += l;
91 s->io_buffer_size += l;
97 /* return 0 if buffer completed */
98 static int bmdma_rw_buf(IDEDMA *dma, int is_write)
100 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
101 IDEState *s = bmdma_active_if(bm);
109 l = s->io_buffer_size - s->io_buffer_index;
112 if (bm->cur_prd_len == 0) {
113 /* end of table (with a fail safe of one page) */
114 if (bm->cur_prd_last ||
115 (bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
117 cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
119 prd.addr = le32_to_cpu(prd.addr);
120 prd.size = le32_to_cpu(prd.size);
121 len = prd.size & 0xfffe;
124 bm->cur_prd_len = len;
125 bm->cur_prd_addr = prd.addr;
126 bm->cur_prd_last = (prd.size & 0x80000000);
128 if (l > bm->cur_prd_len)
132 cpu_physical_memory_write(bm->cur_prd_addr,
133 s->io_buffer + s->io_buffer_index, l);
135 cpu_physical_memory_read(bm->cur_prd_addr,
136 s->io_buffer + s->io_buffer_index, l);
138 bm->cur_prd_addr += l;
139 bm->cur_prd_len -= l;
140 s->io_buffer_index += l;
146 static int bmdma_set_unit(IDEDMA *dma, int unit)
148 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
154 static int bmdma_add_status(IDEDMA *dma, int status)
156 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
157 bm->status |= status;
162 static int bmdma_set_inactive(IDEDMA *dma)
164 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
166 bm->status &= ~BM_STATUS_DMAING;
173 static void bmdma_restart_dma(BMDMAState *bm, int is_read)
175 IDEState *s = bmdma_active_if(bm);
177 ide_set_sector(s, bm->sector_num);
178 s->io_buffer_index = 0;
179 s->io_buffer_size = 0;
180 s->nsector = bm->nsector;
181 s->is_read = is_read;
182 bm->cur_addr = bm->addr;
183 bm->dma_cb = ide_dma_cb;
184 bmdma_start_dma(&bm->dma, s, bm->dma_cb);
187 static void bmdma_restart_bh(void *opaque)
189 BMDMAState *bm = opaque;
192 qemu_bh_delete(bm->bh);
195 is_read = !!(bm->status & BM_STATUS_RETRY_READ);
197 if (bm->status & BM_STATUS_DMA_RETRY) {
198 bm->status &= ~(BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ);
199 bmdma_restart_dma(bm, is_read);
200 } else if (bm->status & BM_STATUS_PIO_RETRY) {
201 bm->status &= ~(BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ);
203 ide_sector_read(bmdma_active_if(bm));
205 ide_sector_write(bmdma_active_if(bm));
207 } else if (bm->status & BM_STATUS_RETRY_FLUSH) {
208 ide_flush_cache(bmdma_active_if(bm));
212 static void bmdma_restart_cb(void *opaque, int running, int reason)
214 IDEDMA *dma = opaque;
215 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
221 bm->bh = qemu_bh_new(bmdma_restart_bh, &bm->dma);
222 qemu_bh_schedule(bm->bh);
226 static void bmdma_cancel(BMDMAState *bm)
228 if (bm->status & BM_STATUS_DMAING) {
229 /* cancel DMA request */
230 bmdma_set_inactive(&bm->dma);
234 static int bmdma_reset(IDEDMA *dma)
236 BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
239 printf("ide: dma_reset\n");
246 bm->cur_prd_last = 0;
247 bm->cur_prd_addr = 0;
255 static int bmdma_start_transfer(IDEDMA *dma)
260 static void bmdma_irq(void *opaque, int n, int level)
262 BMDMAState *bm = opaque;
265 /* pass through lower */
266 qemu_set_irq(bm->irq, level);
270 bm->status |= BM_STATUS_INT;
272 /* trigger the real irq */
273 qemu_set_irq(bm->irq, level);
276 void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)
278 BMDMAState *bm = opaque;
280 printf("%s: 0x%08x\n", __func__, val);
283 /* Ignore writes to SSBM if it keeps the old value */
284 if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) {
285 if (!(val & BM_CMD_START)) {
287 * We can't cancel Scatter Gather DMA in the middle of the
288 * operation or a partial (not full) DMA transfer would reach
289 * the storage so we wait for completion instead (we beahve
290 * like if the DMA was completed by the time the guest trying
291 * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not
294 * In the future we'll be able to safely cancel the I/O if the
295 * whole DMA operation will be submitted to disk with a single
296 * aio operation with preadv/pwritev.
298 if (bm->bus->dma->aiocb) {
301 if (bm->bus->dma->aiocb)
302 printf("ide_dma_cancel: aiocb still pending");
303 if (bm->status & BM_STATUS_DMAING)
304 printf("ide_dma_cancel: BM_STATUS_DMAING still pending");
308 bm->cur_addr = bm->addr;
309 if (!(bm->status & BM_STATUS_DMAING)) {
310 bm->status |= BM_STATUS_DMAING;
311 /* start dma transfer if possible */
313 bm->dma_cb(bmdma_active_if(bm), 0);
318 bm->cmd = val & 0x09;
321 static void bmdma_addr_read(IORange *ioport, uint64_t addr,
322 unsigned width, uint64_t *data)
324 BMDMAState *bm = container_of(ioport, BMDMAState, addr_ioport);
325 uint32_t mask = (1ULL << (width * 8)) - 1;
327 *data = (bm->addr >> (addr * 8)) & mask;
329 printf("%s: 0x%08x\n", __func__, (unsigned)*data);
333 static void bmdma_addr_write(IORange *ioport, uint64_t addr,
334 unsigned width, uint64_t data)
336 BMDMAState *bm = container_of(ioport, BMDMAState, addr_ioport);
337 int shift = addr * 8;
338 uint32_t mask = (1ULL << (width * 8)) - 1;
341 printf("%s: 0x%08x\n", __func__, (unsigned)data);
343 bm->addr &= ~(mask << shift);
344 bm->addr |= ((data & mask) << shift) & ~3;
347 const IORangeOps bmdma_addr_ioport_ops = {
348 .read = bmdma_addr_read,
349 .write = bmdma_addr_write,
352 static bool ide_bmdma_current_needed(void *opaque)
354 BMDMAState *bm = opaque;
356 return (bm->cur_prd_len != 0);
359 static const VMStateDescription vmstate_bmdma_current = {
360 .name = "ide bmdma_current",
362 .minimum_version_id = 1,
363 .minimum_version_id_old = 1,
364 .fields = (VMStateField []) {
365 VMSTATE_UINT32(cur_addr, BMDMAState),
366 VMSTATE_UINT32(cur_prd_last, BMDMAState),
367 VMSTATE_UINT32(cur_prd_addr, BMDMAState),
368 VMSTATE_UINT32(cur_prd_len, BMDMAState),
369 VMSTATE_END_OF_LIST()
374 static const VMStateDescription vmstate_bmdma = {
377 .minimum_version_id = 0,
378 .minimum_version_id_old = 0,
379 .fields = (VMStateField []) {
380 VMSTATE_UINT8(cmd, BMDMAState),
381 VMSTATE_UINT8(status, BMDMAState),
382 VMSTATE_UINT32(addr, BMDMAState),
383 VMSTATE_INT64(sector_num, BMDMAState),
384 VMSTATE_UINT32(nsector, BMDMAState),
385 VMSTATE_UINT8(unit, BMDMAState),
386 VMSTATE_END_OF_LIST()
388 .subsections = (VMStateSubsection []) {
390 .vmsd = &vmstate_bmdma_current,
391 .needed = ide_bmdma_current_needed,
398 static int ide_pci_post_load(void *opaque, int version_id)
400 PCIIDEState *d = opaque;
403 for(i = 0; i < 2; i++) {
404 /* current versions always store 0/1, but older version
405 stored bigger values. We only need last bit */
406 d->bmdma[i].unit &= 1;
411 const VMStateDescription vmstate_ide_pci = {
414 .minimum_version_id = 0,
415 .minimum_version_id_old = 0,
416 .post_load = ide_pci_post_load,
417 .fields = (VMStateField []) {
418 VMSTATE_PCI_DEVICE(dev, PCIIDEState),
419 VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
420 vmstate_bmdma, BMDMAState),
421 VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),
422 VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
423 VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),
424 VMSTATE_END_OF_LIST()
428 void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
430 PCIIDEState *d = DO_UPCAST(PCIIDEState, dev, dev);
431 static const int bus[4] = { 0, 0, 1, 1 };
432 static const int unit[4] = { 0, 1, 0, 1 };
435 for (i = 0; i < 4; i++) {
436 if (hd_table[i] == NULL)
438 ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);
442 static const struct IDEDMAOps bmdma_ops = {
443 .start_dma = bmdma_start_dma,
444 .start_transfer = bmdma_start_transfer,
445 .prepare_buf = bmdma_prepare_buf,
446 .rw_buf = bmdma_rw_buf,
447 .set_unit = bmdma_set_unit,
448 .add_status = bmdma_add_status,
449 .set_inactive = bmdma_set_inactive,
450 .restart_cb = bmdma_restart_cb,
451 .reset = bmdma_reset,
454 void bmdma_init(IDEBus *bus, BMDMAState *bm)
458 if (bus->dma == &bm->dma) {
462 bm->dma.ops = &bmdma_ops;
465 irq = qemu_allocate_irqs(bmdma_irq, bm, 1);