469 lines
13 KiB
C
469 lines
13 KiB
C
/*
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* QEMU IDE Emulation: PCI Bus support.
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*
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2006 Openedhand Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include <hw/hw.h>
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#include <hw/i386/pc.h>
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#include <hw/pci/pci.h>
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#include <hw/isa/isa.h>
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#include "sysemu/block-backend.h"
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#include "sysemu/dma.h"
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#include "qemu/error-report.h"
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#include <hw/ide/pci.h>
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#define BMDMA_PAGE_SIZE 4096
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#define BM_MIGRATION_COMPAT_STATUS_BITS \
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(IDE_RETRY_DMA | IDE_RETRY_PIO | \
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IDE_RETRY_READ | IDE_RETRY_FLUSH)
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static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
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BlockCompletionFunc *dma_cb)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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bm->dma_cb = dma_cb;
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bm->cur_prd_last = 0;
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bm->cur_prd_addr = 0;
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bm->cur_prd_len = 0;
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if (bm->status & BM_STATUS_DMAING) {
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bm->dma_cb(bmdma_active_if(bm), 0);
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}
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}
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/**
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* Prepare an sglist based on available PRDs.
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* @limit: How many bytes to prepare total.
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*
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* Returns the number of bytes prepared, -1 on error.
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* IDEState.io_buffer_size will contain the number of bytes described
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* by the PRDs, whether or not we added them to the sglist.
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*/
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static int32_t bmdma_prepare_buf(IDEDMA *dma, int32_t limit)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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IDEState *s = bmdma_active_if(bm);
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PCIDevice *pci_dev = PCI_DEVICE(bm->pci_dev);
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struct {
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uint32_t addr;
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uint32_t size;
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} prd;
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int l, len;
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pci_dma_sglist_init(&s->sg, pci_dev,
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s->nsector / (BMDMA_PAGE_SIZE / 512) + 1);
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s->io_buffer_size = 0;
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for(;;) {
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if (bm->cur_prd_len == 0) {
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/* end of table (with a fail safe of one page) */
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if (bm->cur_prd_last ||
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(bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE) {
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return s->sg.size;
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}
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pci_dma_read(pci_dev, bm->cur_addr, &prd, 8);
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bm->cur_addr += 8;
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prd.addr = le32_to_cpu(prd.addr);
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prd.size = le32_to_cpu(prd.size);
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len = prd.size & 0xfffe;
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if (len == 0)
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len = 0x10000;
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bm->cur_prd_len = len;
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bm->cur_prd_addr = prd.addr;
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bm->cur_prd_last = (prd.size & 0x80000000);
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}
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l = bm->cur_prd_len;
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if (l > 0) {
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uint64_t sg_len;
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/* Don't add extra bytes to the SGList; consume any remaining
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* PRDs from the guest, but ignore them. */
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sg_len = MIN(limit - s->sg.size, bm->cur_prd_len);
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if (sg_len) {
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qemu_sglist_add(&s->sg, bm->cur_prd_addr, sg_len);
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}
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bm->cur_prd_addr += l;
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bm->cur_prd_len -= l;
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s->io_buffer_size += l;
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}
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}
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qemu_sglist_destroy(&s->sg);
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s->io_buffer_size = 0;
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return -1;
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}
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/* return 0 if buffer completed */
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static int bmdma_rw_buf(IDEDMA *dma, int is_write)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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IDEState *s = bmdma_active_if(bm);
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PCIDevice *pci_dev = PCI_DEVICE(bm->pci_dev);
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struct {
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uint32_t addr;
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uint32_t size;
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} prd;
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int l, len;
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for(;;) {
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l = s->io_buffer_size - s->io_buffer_index;
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if (l <= 0)
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break;
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if (bm->cur_prd_len == 0) {
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/* end of table (with a fail safe of one page) */
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if (bm->cur_prd_last ||
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(bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
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return 0;
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pci_dma_read(pci_dev, bm->cur_addr, &prd, 8);
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bm->cur_addr += 8;
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prd.addr = le32_to_cpu(prd.addr);
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prd.size = le32_to_cpu(prd.size);
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len = prd.size & 0xfffe;
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if (len == 0)
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len = 0x10000;
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bm->cur_prd_len = len;
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bm->cur_prd_addr = prd.addr;
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bm->cur_prd_last = (prd.size & 0x80000000);
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}
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if (l > bm->cur_prd_len)
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l = bm->cur_prd_len;
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if (l > 0) {
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if (is_write) {
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pci_dma_write(pci_dev, bm->cur_prd_addr,
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s->io_buffer + s->io_buffer_index, l);
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} else {
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pci_dma_read(pci_dev, bm->cur_prd_addr,
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s->io_buffer + s->io_buffer_index, l);
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}
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bm->cur_prd_addr += l;
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bm->cur_prd_len -= l;
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s->io_buffer_index += l;
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}
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}
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return 1;
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}
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static void bmdma_set_inactive(IDEDMA *dma, bool more)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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bm->dma_cb = NULL;
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if (more) {
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bm->status |= BM_STATUS_DMAING;
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} else {
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bm->status &= ~BM_STATUS_DMAING;
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}
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}
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static void bmdma_restart_dma(IDEDMA *dma)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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bm->cur_addr = bm->addr;
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}
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static void bmdma_cancel(BMDMAState *bm)
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{
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if (bm->status & BM_STATUS_DMAING) {
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/* cancel DMA request */
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bmdma_set_inactive(&bm->dma, false);
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}
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}
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static void bmdma_reset(IDEDMA *dma)
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{
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BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
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#ifdef DEBUG_IDE
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printf("ide: dma_reset\n");
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#endif
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bmdma_cancel(bm);
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bm->cmd = 0;
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bm->status = 0;
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bm->addr = 0;
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bm->cur_addr = 0;
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bm->cur_prd_last = 0;
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bm->cur_prd_addr = 0;
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bm->cur_prd_len = 0;
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}
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static void bmdma_irq(void *opaque, int n, int level)
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{
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BMDMAState *bm = opaque;
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if (!level) {
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/* pass through lower */
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qemu_set_irq(bm->irq, level);
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return;
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}
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bm->status |= BM_STATUS_INT;
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/* trigger the real irq */
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qemu_set_irq(bm->irq, level);
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}
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void bmdma_cmd_writeb(BMDMAState *bm, uint32_t val)
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{
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#ifdef DEBUG_IDE
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printf("%s: 0x%08x\n", __func__, val);
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#endif
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/* Ignore writes to SSBM if it keeps the old value */
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if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) {
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if (!(val & BM_CMD_START)) {
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ide_cancel_dma_sync(idebus_active_if(bm->bus));
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bm->status &= ~BM_STATUS_DMAING;
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} else {
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bm->cur_addr = bm->addr;
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if (!(bm->status & BM_STATUS_DMAING)) {
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bm->status |= BM_STATUS_DMAING;
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/* start dma transfer if possible */
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if (bm->dma_cb)
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bm->dma_cb(bmdma_active_if(bm), 0);
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}
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}
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}
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bm->cmd = val & 0x09;
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}
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static uint64_t bmdma_addr_read(void *opaque, hwaddr addr,
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unsigned width)
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{
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BMDMAState *bm = opaque;
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uint32_t mask = (1ULL << (width * 8)) - 1;
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uint64_t data;
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data = (bm->addr >> (addr * 8)) & mask;
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#ifdef DEBUG_IDE
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printf("%s: 0x%08x\n", __func__, (unsigned)data);
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#endif
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return data;
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}
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static void bmdma_addr_write(void *opaque, hwaddr addr,
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uint64_t data, unsigned width)
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{
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BMDMAState *bm = opaque;
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int shift = addr * 8;
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uint32_t mask = (1ULL << (width * 8)) - 1;
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#ifdef DEBUG_IDE
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printf("%s: 0x%08x\n", __func__, (unsigned)data);
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#endif
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bm->addr &= ~(mask << shift);
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bm->addr |= ((data & mask) << shift) & ~3;
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}
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MemoryRegionOps bmdma_addr_ioport_ops = {
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.read = bmdma_addr_read,
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.write = bmdma_addr_write,
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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static bool ide_bmdma_current_needed(void *opaque)
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{
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BMDMAState *bm = opaque;
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return (bm->cur_prd_len != 0);
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}
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static bool ide_bmdma_status_needed(void *opaque)
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{
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BMDMAState *bm = opaque;
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/* Older versions abused some bits in the status register for internal
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* error state. If any of these bits are set, we must add a subsection to
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* transfer the real status register */
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uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
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return ((bm->status & abused_bits) != 0);
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}
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static void ide_bmdma_pre_save(void *opaque)
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{
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BMDMAState *bm = opaque;
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uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
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if (!(bm->status & BM_STATUS_DMAING) && bm->dma_cb) {
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bm->bus->error_status =
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ide_dma_cmd_to_retry(bmdma_active_if(bm)->dma_cmd);
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}
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bm->migration_retry_unit = bm->bus->retry_unit;
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bm->migration_retry_sector_num = bm->bus->retry_sector_num;
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bm->migration_retry_nsector = bm->bus->retry_nsector;
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bm->migration_compat_status =
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(bm->status & ~abused_bits) | (bm->bus->error_status & abused_bits);
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}
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/* This function accesses bm->bus->error_status which is loaded only after
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* BMDMA itself. This is why the function is called from ide_pci_post_load
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* instead of being registered with VMState where it would run too early. */
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static int ide_bmdma_post_load(void *opaque, int version_id)
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{
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BMDMAState *bm = opaque;
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uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
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if (bm->status == 0) {
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bm->status = bm->migration_compat_status & ~abused_bits;
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bm->bus->error_status |= bm->migration_compat_status & abused_bits;
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}
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if (bm->bus->error_status) {
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bm->bus->retry_sector_num = bm->migration_retry_sector_num;
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bm->bus->retry_nsector = bm->migration_retry_nsector;
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bm->bus->retry_unit = bm->migration_retry_unit;
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}
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return 0;
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}
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static const VMStateDescription vmstate_bmdma_current = {
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.name = "ide bmdma_current",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = ide_bmdma_current_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(cur_addr, BMDMAState),
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VMSTATE_UINT32(cur_prd_last, BMDMAState),
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VMSTATE_UINT32(cur_prd_addr, BMDMAState),
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VMSTATE_UINT32(cur_prd_len, BMDMAState),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_bmdma_status = {
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.name ="ide bmdma/status",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = ide_bmdma_status_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8(status, BMDMAState),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_bmdma = {
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.name = "ide bmdma",
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.version_id = 3,
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.minimum_version_id = 0,
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.pre_save = ide_bmdma_pre_save,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8(cmd, BMDMAState),
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VMSTATE_UINT8(migration_compat_status, BMDMAState),
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VMSTATE_UINT32(addr, BMDMAState),
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VMSTATE_INT64(migration_retry_sector_num, BMDMAState),
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VMSTATE_UINT32(migration_retry_nsector, BMDMAState),
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VMSTATE_UINT8(migration_retry_unit, BMDMAState),
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VMSTATE_END_OF_LIST()
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},
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.subsections = (const VMStateDescription*[]) {
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&vmstate_bmdma_current,
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&vmstate_bmdma_status,
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NULL
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}
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};
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static int ide_pci_post_load(void *opaque, int version_id)
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{
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PCIIDEState *d = opaque;
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int i;
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for(i = 0; i < 2; i++) {
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/* current versions always store 0/1, but older version
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stored bigger values. We only need last bit */
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d->bmdma[i].migration_retry_unit &= 1;
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ide_bmdma_post_load(&d->bmdma[i], -1);
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}
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return 0;
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}
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const VMStateDescription vmstate_ide_pci = {
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.name = "ide",
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.version_id = 3,
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.minimum_version_id = 0,
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.post_load = ide_pci_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_PCI_DEVICE(parent_obj, PCIIDEState),
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VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
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vmstate_bmdma, BMDMAState),
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VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),
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VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
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VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),
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VMSTATE_END_OF_LIST()
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}
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};
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void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
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{
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PCIIDEState *d = PCI_IDE(dev);
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static const int bus[4] = { 0, 0, 1, 1 };
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static const int unit[4] = { 0, 1, 0, 1 };
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int i;
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for (i = 0; i < 4; i++) {
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if (hd_table[i] == NULL)
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continue;
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ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);
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}
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}
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static const struct IDEDMAOps bmdma_ops = {
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.start_dma = bmdma_start_dma,
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.prepare_buf = bmdma_prepare_buf,
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.rw_buf = bmdma_rw_buf,
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.restart_dma = bmdma_restart_dma,
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.set_inactive = bmdma_set_inactive,
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.reset = bmdma_reset,
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};
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void bmdma_init(IDEBus *bus, BMDMAState *bm, PCIIDEState *d)
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{
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if (bus->dma == &bm->dma) {
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return;
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}
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bm->dma.ops = &bmdma_ops;
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bus->dma = &bm->dma;
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bm->irq = bus->irq;
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bus->irq = qemu_allocate_irq(bmdma_irq, bm, 0);
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bm->pci_dev = d;
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}
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static const TypeInfo pci_ide_type_info = {
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.name = TYPE_PCI_IDE,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(PCIIDEState),
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.abstract = true,
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};
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static void pci_ide_register_types(void)
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{
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type_register_static(&pci_ide_type_info);
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}
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type_init(pci_ide_register_types)
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