The guest OS reads RSTAT, RSEQ, and RINTR, and expects those registers to reflect a consistent state. However, it is possible that the registers can change after RSTAT was read, but before RINTR is read, when esp_command_complete() is called. Guest OS qemu -------- ---- [handle interrupt] Read RSTAT esp_command_complete() RSTAT = STAT_ST esp_dma_done() RSTAT |= STAT_TC RSEQ = 0 RINTR = INTR_BS Read RSEQ Read RINTR RINTR = 0 RSTAT &= ~STAT_TC RSEQ = SEQ_CD The guest OS would then try to handle INTR_BS combined with an old value of RSTAT. This sometimes resulted in lost events, spurious interrupts, guest OS confusion, and stalled SCSI operations. A typical guest error log (observed with various versions of Linux) looks as follows. scsi host1: Spurious irq, sreg=13. ... scsi host1: Aborting command [84531f10:2a] scsi host1: Current command [f882eea8:35] scsi host1: Queued command [84531f10:2a] scsi host1: Active command [f882eea8:35] scsi host1: Dumping command log scsi host1: ent[15] CMD val[44] sreg[90] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] scsi host1: ent[16] CMD val[01] sreg[90] seqreg[00] sreg2[00] ireg[20] ss[02] event[0c] scsi host1: ent[17] CMD val[43] sreg[90] seqreg[00] sreg2[00] ireg[20] ss[02] event[0c] scsi host1: ent[18] EVENT val[0d] sreg[92] seqreg[04] sreg2[00] ireg[18] ss[00] event[0c] ... Defer handling command completion until previous interrupts have been handled to fix the problem. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
#ifndef QEMU_HW_ESP_H
|
|
#define QEMU_HW_ESP_H
|
|
|
|
#include "hw/scsi/scsi.h"
|
|
#include "hw/sysbus.h"
|
|
|
|
/* esp.c */
|
|
#define ESP_MAX_DEVS 7
|
|
typedef void (*ESPDMAMemoryReadWriteFunc)(void *opaque, uint8_t *buf, int len);
|
|
|
|
#define ESP_REGS 16
|
|
#define TI_BUFSZ 16
|
|
#define ESP_CMDBUF_SZ 32
|
|
|
|
typedef struct ESPState ESPState;
|
|
|
|
struct ESPState {
|
|
uint8_t rregs[ESP_REGS];
|
|
uint8_t wregs[ESP_REGS];
|
|
qemu_irq irq;
|
|
uint8_t chip_id;
|
|
bool tchi_written;
|
|
int32_t ti_size;
|
|
uint32_t ti_rptr, ti_wptr;
|
|
uint32_t status;
|
|
uint32_t deferred_status;
|
|
bool deferred_complete;
|
|
uint32_t dma;
|
|
uint8_t ti_buf[TI_BUFSZ];
|
|
SCSIBus bus;
|
|
SCSIDevice *current_dev;
|
|
SCSIRequest *current_req;
|
|
uint8_t cmdbuf[ESP_CMDBUF_SZ];
|
|
uint32_t cmdlen;
|
|
uint32_t do_cmd;
|
|
|
|
/* The amount of data left in the current DMA transfer. */
|
|
uint32_t dma_left;
|
|
/* The size of the current DMA transfer. Zero if no transfer is in
|
|
progress. */
|
|
uint32_t dma_counter;
|
|
int dma_enabled;
|
|
|
|
uint32_t async_len;
|
|
uint8_t *async_buf;
|
|
|
|
ESPDMAMemoryReadWriteFunc dma_memory_read;
|
|
ESPDMAMemoryReadWriteFunc dma_memory_write;
|
|
void *dma_opaque;
|
|
void (*dma_cb)(ESPState *s);
|
|
};
|
|
|
|
#define TYPE_ESP "esp"
|
|
#define ESP_STATE(obj) OBJECT_CHECK(SysBusESPState, (obj), TYPE_ESP)
|
|
|
|
typedef struct {
|
|
/*< private >*/
|
|
SysBusDevice parent_obj;
|
|
/*< public >*/
|
|
|
|
MemoryRegion iomem;
|
|
uint32_t it_shift;
|
|
ESPState esp;
|
|
} SysBusESPState;
|
|
|
|
#define ESP_TCLO 0x0
|
|
#define ESP_TCMID 0x1
|
|
#define ESP_FIFO 0x2
|
|
#define ESP_CMD 0x3
|
|
#define ESP_RSTAT 0x4
|
|
#define ESP_WBUSID 0x4
|
|
#define ESP_RINTR 0x5
|
|
#define ESP_WSEL 0x5
|
|
#define ESP_RSEQ 0x6
|
|
#define ESP_WSYNTP 0x6
|
|
#define ESP_RFLAGS 0x7
|
|
#define ESP_WSYNO 0x7
|
|
#define ESP_CFG1 0x8
|
|
#define ESP_RRES1 0x9
|
|
#define ESP_WCCF 0x9
|
|
#define ESP_RRES2 0xa
|
|
#define ESP_WTEST 0xa
|
|
#define ESP_CFG2 0xb
|
|
#define ESP_CFG3 0xc
|
|
#define ESP_RES3 0xd
|
|
#define ESP_TCHI 0xe
|
|
#define ESP_RES4 0xf
|
|
|
|
#define CMD_DMA 0x80
|
|
#define CMD_CMD 0x7f
|
|
|
|
#define CMD_NOP 0x00
|
|
#define CMD_FLUSH 0x01
|
|
#define CMD_RESET 0x02
|
|
#define CMD_BUSRESET 0x03
|
|
#define CMD_TI 0x10
|
|
#define CMD_ICCS 0x11
|
|
#define CMD_MSGACC 0x12
|
|
#define CMD_PAD 0x18
|
|
#define CMD_SATN 0x1a
|
|
#define CMD_RSTATN 0x1b
|
|
#define CMD_SEL 0x41
|
|
#define CMD_SELATN 0x42
|
|
#define CMD_SELATNS 0x43
|
|
#define CMD_ENSEL 0x44
|
|
#define CMD_DISSEL 0x45
|
|
|
|
#define STAT_DO 0x00
|
|
#define STAT_DI 0x01
|
|
#define STAT_CD 0x02
|
|
#define STAT_ST 0x03
|
|
#define STAT_MO 0x06
|
|
#define STAT_MI 0x07
|
|
#define STAT_PIO_MASK 0x06
|
|
|
|
#define STAT_TC 0x10
|
|
#define STAT_PE 0x20
|
|
#define STAT_GE 0x40
|
|
#define STAT_INT 0x80
|
|
|
|
#define BUSID_DID 0x07
|
|
|
|
#define INTR_FC 0x08
|
|
#define INTR_BS 0x10
|
|
#define INTR_DC 0x20
|
|
#define INTR_RST 0x80
|
|
|
|
#define SEQ_0 0x0
|
|
#define SEQ_CD 0x4
|
|
|
|
#define CFG1_RESREPT 0x40
|
|
|
|
#define TCHI_FAS100A 0x4
|
|
#define TCHI_AM53C974 0x12
|
|
|
|
void esp_dma_enable(ESPState *s, int irq, int level);
|
|
void esp_request_cancelled(SCSIRequest *req);
|
|
void esp_command_complete(SCSIRequest *req, uint32_t status, size_t resid);
|
|
void esp_transfer_data(SCSIRequest *req, uint32_t len);
|
|
void esp_hard_reset(ESPState *s);
|
|
uint64_t esp_reg_read(ESPState *s, uint32_t saddr);
|
|
void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val);
|
|
extern const VMStateDescription vmstate_esp;
|
|
|
|
#endif
|