diff options
Diffstat (limited to 'hw/xen_pt.h')
| -rw-r--r-- | hw/xen_pt.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/hw/xen_pt.h b/hw/xen_pt.h new file mode 100644 index 0000000..36001a7 --- /dev/null +++ b/hw/xen_pt.h @@ -0,0 +1,248 @@ +#ifndef XEN_PT_H +#define XEN_PT_H + +#include "qemu-common.h" +#include "xen_common.h" +#include "pci.h" +#include "xen-host-pci-device.h" + +void xen_pt_log(const PCIDevice *d, const char *f, ...) GCC_FMT_ATTR(2, 3); + +#define XEN_PT_ERR(d, _f, _a...) xen_pt_log(d, "%s: Error: "_f, __func__, ##_a) + +#ifdef XEN_PT_LOGGING_ENABLED +# define XEN_PT_LOG(d, _f, _a...) xen_pt_log(d, "%s: " _f, __func__, ##_a) +# define XEN_PT_WARN(d, _f, _a...) \ + xen_pt_log(d, "%s: Warning: "_f, __func__, ##_a) +#else +# define XEN_PT_LOG(d, _f, _a...) +# define XEN_PT_WARN(d, _f, _a...) +#endif + +#ifdef XEN_PT_DEBUG_PCI_CONFIG_ACCESS +# define XEN_PT_LOG_CONFIG(d, addr, val, len) \ + xen_pt_log(d, "%s: address=0x%04x val=0x%08x len=%d\n", \ + __func__, addr, val, len) +#else +# define XEN_PT_LOG_CONFIG(d, addr, val, len) +#endif + + +/* Helper */ +#define XEN_PFN(x) ((x) >> XC_PAGE_SHIFT) + +typedef struct XenPTRegInfo XenPTRegInfo; +typedef struct XenPTReg XenPTReg; + +typedef struct XenPCIPassthroughState XenPCIPassthroughState; + +/* function type for config reg */ +typedef int (*xen_pt_conf_reg_init) + (XenPCIPassthroughState *, XenPTRegInfo *, uint32_t real_offset, + uint32_t *data); +typedef int (*xen_pt_conf_dword_write) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint32_t *val, uint32_t dev_value, uint32_t valid_mask); +typedef int (*xen_pt_conf_word_write) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint16_t *val, uint16_t dev_value, uint16_t valid_mask); +typedef int (*xen_pt_conf_byte_write) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint8_t *val, uint8_t dev_value, uint8_t valid_mask); +typedef int (*xen_pt_conf_dword_read) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint32_t *val, uint32_t valid_mask); +typedef int (*xen_pt_conf_word_read) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint16_t *val, uint16_t valid_mask); +typedef int (*xen_pt_conf_byte_read) + (XenPCIPassthroughState *, XenPTReg *cfg_entry, + uint8_t *val, uint8_t valid_mask); + +#define XEN_PT_BAR_ALLF 0xFFFFFFFF +#define XEN_PT_BAR_UNMAPPED (-1) + + +typedef enum { + XEN_PT_GRP_TYPE_HARDWIRED = 0, /* 0 Hardwired reg group */ + XEN_PT_GRP_TYPE_EMU, /* emul reg group */ +} XenPTRegisterGroupType; + +typedef enum { + XEN_PT_BAR_FLAG_MEM = 0, /* Memory type BAR */ + XEN_PT_BAR_FLAG_IO, /* I/O type BAR */ + XEN_PT_BAR_FLAG_UPPER, /* upper 64bit BAR */ + XEN_PT_BAR_FLAG_UNUSED, /* unused BAR */ +} XenPTBarFlag; + + +typedef struct XenPTRegion { + /* BAR flag */ + XenPTBarFlag bar_flag; + /* Translation of the emulated address */ + union { + uint64_t maddr; + uint64_t pio_base; + uint64_t u; + } access; +} XenPTRegion; + +/* XenPTRegInfo declaration + * - only for emulated register (either a part or whole bit). + * - for passthrough register that need special behavior (like interacting with + * other component), set emu_mask to all 0 and specify r/w func properly. + * - do NOT use ALL F for init_val, otherwise the tbl will not be registered. + */ + +/* emulated register infomation */ +struct XenPTRegInfo { + uint32_t offset; + uint32_t size; + uint32_t init_val; + /* reg read only field mask (ON:RO/ROS, OFF:other) */ + uint32_t ro_mask; + /* reg emulate field mask (ON:emu, OFF:passthrough) */ + uint32_t emu_mask; + /* no write back allowed */ + uint32_t no_wb; + xen_pt_conf_reg_init init; + /* read/write function pointer + * for double_word/word/byte size */ + union { + struct { + xen_pt_conf_dword_write write; + xen_pt_conf_dword_read read; + } dw; + struct { + xen_pt_conf_word_write write; + xen_pt_conf_word_read read; + } w; + struct { + xen_pt_conf_byte_write write; + xen_pt_conf_byte_read read; + } b; + } u; +}; + +/* emulated register management */ +struct XenPTReg { + QLIST_ENTRY(XenPTReg) entries; + XenPTRegInfo *reg; + uint32_t data; /* emulated value */ +}; + +typedef struct XenPTRegGroupInfo XenPTRegGroupInfo; + +/* emul reg group size initialize method */ +typedef int (*xen_pt_reg_size_init_fn) + (XenPCIPassthroughState *, const XenPTRegGroupInfo *, + uint32_t base_offset, uint8_t *size); + +/* emulated register group infomation */ +struct XenPTRegGroupInfo { + uint8_t grp_id; + XenPTRegisterGroupType grp_type; + uint8_t grp_size; + xen_pt_reg_size_init_fn size_init; + XenPTRegInfo *emu_regs; +}; + +/* emul register group management table */ +typedef struct XenPTRegGroup { + QLIST_ENTRY(XenPTRegGroup) entries; + const XenPTRegGroupInfo *reg_grp; + uint32_t base_offset; + uint8_t size; + QLIST_HEAD(, XenPTReg) reg_tbl_list; +} XenPTRegGroup; + + +#define XEN_PT_UNASSIGNED_PIRQ (-1) + +struct XenPCIPassthroughState { + PCIDevice dev; + + PCIHostDeviceAddress hostaddr; + bool is_virtfn; + XenHostPCIDevice real_device; + XenPTRegion bases[PCI_NUM_REGIONS]; /* Access regions */ + QLIST_HEAD(, XenPTRegGroup) reg_grps; + + uint32_t machine_irq; + + MemoryRegion bar[PCI_NUM_REGIONS - 1]; + MemoryRegion rom; + + MemoryListener memory_listener; +}; + +int xen_pt_config_init(XenPCIPassthroughState *s); +void xen_pt_config_delete(XenPCIPassthroughState *s); +XenPTRegGroup *xen_pt_find_reg_grp(XenPCIPassthroughState *s, uint32_t address); +XenPTReg *xen_pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address); +int xen_pt_bar_offset_to_index(uint32_t offset); + +static inline pcibus_t xen_pt_get_emul_size(XenPTBarFlag flag, pcibus_t r_size) +{ + /* align resource size (memory type only) */ + if (flag == XEN_PT_BAR_FLAG_MEM) { + return (r_size + XC_PAGE_SIZE - 1) & XC_PAGE_MASK; + } else { + return r_size; + } +} + +/* INTx */ +/* The PCI Local Bus Specification, Rev. 3.0, + * Section 6.2.4 Miscellaneous Registers, pp 223 + * outlines 5 valid values for the interrupt pin (intx). + * 0: For devices (or device functions) that don't use an interrupt in + * 1: INTA# + * 2: INTB# + * 3: INTC# + * 4: INTD# + * + * Xen uses the following 4 values for intx + * 0: INTA# + * 1: INTB# + * 2: INTC# + * 3: INTD# + * + * Observing that these list of values are not the same, xen_pt_pci_read_intx() + * uses the following mapping from hw to xen values. + * This seems to reflect the current usage within Xen. + * + * PCI hardware | Xen | Notes + * ----------------+-----+---------------------------------------------------- + * 0 | 0 | No interrupt + * 1 | 0 | INTA# + * 2 | 1 | INTB# + * 3 | 2 | INTC# + * 4 | 3 | INTD# + * any other value | 0 | This should never happen, log error message + */ + +static inline uint8_t xen_pt_pci_read_intx(XenPCIPassthroughState *s) +{ + uint8_t v = 0; + xen_host_pci_get_byte(&s->real_device, PCI_INTERRUPT_PIN, &v); + return v; +} + +static inline uint8_t xen_pt_pci_intx(XenPCIPassthroughState *s) +{ + uint8_t r_val = xen_pt_pci_read_intx(s); + + XEN_PT_LOG(&s->dev, "intx=%i\n", r_val); + if (r_val < 1 || r_val > 4) { + XEN_PT_LOG(&s->dev, "Interrupt pin read from hardware is out of range:" + " value=%i, acceptable range is 1 - 4\n", r_val); + r_val = 0; + } else { + r_val -= 1; + } + + return r_val; +} + +#endif /* !XEN_PT_H */ |