[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PULL 23/29] xen/pt: Remove XenPTReg->data field.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> We do not want to have two entries to cache the guest configuration registers: XenPTReg->data and dev.config. Instead we want to use only the dev.config. To do without much complications we rip out the ->data field and replace it with an pointer to the dev.config. This way we have the type-checking (uint8_t, uint16_t, etc) and as well and pre-computed location. Alternatively we could compute the offset in dev.config by using the XenPTRRegInfo and XenPTRegGroup every time but this way we have the pre-computed values. This change also exposes some mis-use: - In 'xen_pt_status_reg_init' we used u32 for the Capabilities Pointer register, but said register is an an u16. - In 'xen_pt_msgdata_reg_write' we used u32 but should have only use u16. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- hw/xen/xen_pt.h | 6 +++- hw/xen/xen_pt_config_init.c | 73 ++++++++++++++++++++++++++----------------- 2 files changed, 49 insertions(+), 30 deletions(-) diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h index 6763abc..76551ef 100644 --- a/hw/xen/xen_pt.h +++ b/hw/xen/xen_pt.h @@ -138,7 +138,11 @@ struct XenPTRegInfo { struct XenPTReg { QLIST_ENTRY(XenPTReg) entries; XenPTRegInfo *reg; - uint32_t data; /* emulated value */ + union { + uint8_t *byte; + uint16_t *half_word; + uint32_t *word; + } ptr; /* pointer to dev.config. */ }; typedef const struct XenPTRegGroupInfo XenPTRegGroupInfo; diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c index b58bf39..e0829b1 100644 --- a/hw/xen/xen_pt_config_init.c +++ b/hw/xen/xen_pt_config_init.c @@ -128,10 +128,11 @@ static int xen_pt_byte_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry, { XenPTRegInfo *reg = cfg_entry->reg; uint8_t valid_emu_mask = 0; + uint8_t *data = cfg_entry->ptr.byte; /* emulate byte register */ valid_emu_mask = reg->emu_mask & valid_mask; - *value = XEN_PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask); + *value = XEN_PT_MERGE_VALUE(*value, *data, ~valid_emu_mask); return 0; } @@ -140,10 +141,11 @@ static int xen_pt_word_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry, { XenPTRegInfo *reg = cfg_entry->reg; uint16_t valid_emu_mask = 0; + uint16_t *data = cfg_entry->ptr.half_word; /* emulate word register */ valid_emu_mask = reg->emu_mask & valid_mask; - *value = XEN_PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask); + *value = XEN_PT_MERGE_VALUE(*value, *data, ~valid_emu_mask); return 0; } @@ -152,10 +154,11 @@ static int xen_pt_long_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry, { XenPTRegInfo *reg = cfg_entry->reg; uint32_t valid_emu_mask = 0; + uint32_t *data = cfg_entry->ptr.word; /* emulate long register */ valid_emu_mask = reg->emu_mask & valid_mask; - *value = XEN_PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask); + *value = XEN_PT_MERGE_VALUE(*value, *data, ~valid_emu_mask); return 0; } @@ -169,10 +172,11 @@ static int xen_pt_byte_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, XenPTRegInfo *reg = cfg_entry->reg; uint8_t writable_mask = 0; uint8_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint8_t *data = cfg_entry->ptr.byte; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -186,10 +190,11 @@ static int xen_pt_word_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, XenPTRegInfo *reg = cfg_entry->reg; uint16_t writable_mask = 0; uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint16_t *data = cfg_entry->ptr.half_word; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -203,10 +208,11 @@ static int xen_pt_long_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, XenPTRegInfo *reg = cfg_entry->reg; uint32_t writable_mask = 0; uint32_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint32_t *data = cfg_entry->ptr.word; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -255,7 +261,7 @@ static int xen_pt_status_reg_init(XenPCIPassthroughState *s, reg_entry = xen_pt_find_reg(reg_grp_entry, PCI_CAPABILITY_LIST); if (reg_entry) { /* check Capabilities Pointer register */ - if (reg_entry->data) { + if (*reg_entry->ptr.half_word) { reg_field |= PCI_STATUS_CAP_LIST; } else { reg_field &= ~PCI_STATUS_CAP_LIST; @@ -301,10 +307,11 @@ static int xen_pt_cmd_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, XenPTRegInfo *reg = cfg_entry->reg; uint16_t writable_mask = 0; uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint16_t *data = cfg_entry->ptr.half_word; /* modify emulate register */ writable_mask = ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ if (*val & PCI_COMMAND_INTX_DISABLE) { @@ -447,7 +454,7 @@ static int xen_pt_bar_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry, /* emulate BAR */ valid_emu_mask = bar_emu_mask & valid_mask; - *value = XEN_PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask); + *value = XEN_PT_MERGE_VALUE(*value, *cfg_entry->ptr.word, ~valid_emu_mask); return 0; } @@ -464,6 +471,7 @@ static int xen_pt_bar_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, uint32_t bar_ro_mask = 0; uint32_t r_size = 0; int index = 0; + uint32_t *data = cfg_entry->ptr.word; index = xen_pt_bar_offset_to_index(reg->offset); if (index < 0 || index >= PCI_NUM_REGIONS) { @@ -500,7 +508,7 @@ static int xen_pt_bar_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry, /* modify emulate register */ writable_mask = bar_emu_mask & ~bar_ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* check whether we need to update the virtual region address or not */ switch (s->bases[index].bar_flag) { @@ -533,6 +541,7 @@ static int xen_pt_exp_rom_bar_reg_write(XenPCIPassthroughState *s, uint32_t throughable_mask = get_throughable_mask(s, reg, valid_mask); pcibus_t r_size = 0; uint32_t bar_ro_mask = 0; + uint32_t *data = cfg_entry->ptr.word; r_size = d->io_regions[PCI_ROM_SLOT].size; base = &s->bases[PCI_ROM_SLOT]; @@ -544,7 +553,7 @@ static int xen_pt_exp_rom_bar_reg_write(XenPCIPassthroughState *s, /* modify emulate register */ writable_mask = ~bar_ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -999,10 +1008,11 @@ static int xen_pt_pmcsr_reg_write(XenPCIPassthroughState *s, XenPTRegInfo *reg = cfg_entry->reg; uint16_t writable_mask = 0; uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint16_t *data = cfg_entry->ptr.half_word; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value & ~PCI_PM_CTRL_PME_STATUS, @@ -1097,6 +1107,7 @@ static int xen_pt_msgctrl_reg_write(XenPCIPassthroughState *s, XenPTMSI *msi = s->msi; uint16_t writable_mask = 0; uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask); + uint16_t *data = cfg_entry->ptr.half_word; /* Currently no support for multi-vector */ if (*val & PCI_MSI_FLAGS_QSIZE) { @@ -1105,8 +1116,8 @@ static int xen_pt_msgctrl_reg_write(XenPCIPassthroughState *s, /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); - msi->flags |= cfg_entry->data & ~PCI_MSI_FLAGS_ENABLE; + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); + msi->flags |= *data & ~PCI_MSI_FLAGS_ENABLE; /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -1220,18 +1231,19 @@ static int xen_pt_msgaddr32_reg_write(XenPCIPassthroughState *s, { XenPTRegInfo *reg = cfg_entry->reg; uint32_t writable_mask = 0; - uint32_t old_addr = cfg_entry->data; + uint32_t old_addr = *cfg_entry->ptr.word; + uint32_t *data = cfg_entry->ptr.word; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); - s->msi->addr_lo = cfg_entry->data; + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); + s->msi->addr_lo = *data; /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, 0); /* update MSI */ - if (cfg_entry->data != old_addr) { + if (*data != old_addr) { if (s->msi->mapped) { xen_pt_msi_update(s); } @@ -1246,7 +1258,8 @@ static int xen_pt_msgaddr64_reg_write(XenPCIPassthroughState *s, { XenPTRegInfo *reg = cfg_entry->reg; uint32_t writable_mask = 0; - uint32_t old_addr = cfg_entry->data; + uint32_t old_addr = *cfg_entry->ptr.word; + uint32_t *data = cfg_entry->ptr.word; /* check whether the type is 64 bit or not */ if (!(s->msi->flags & PCI_MSI_FLAGS_64BIT)) { @@ -1257,15 +1270,15 @@ static int xen_pt_msgaddr64_reg_write(XenPCIPassthroughState *s, /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* update the msi_info too */ - s->msi->addr_hi = cfg_entry->data; + s->msi->addr_hi = *data; /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, 0); /* update MSI */ - if (cfg_entry->data != old_addr) { + if (*data != old_addr) { if (s->msi->mapped) { xen_pt_msi_update(s); } @@ -1284,8 +1297,9 @@ static int xen_pt_msgdata_reg_write(XenPCIPassthroughState *s, XenPTRegInfo *reg = cfg_entry->reg; XenPTMSI *msi = s->msi; uint16_t writable_mask = 0; - uint16_t old_data = cfg_entry->data; + uint16_t old_data = *cfg_entry->ptr.half_word; uint32_t offset = reg->offset; + uint16_t *data = cfg_entry->ptr.half_word; /* check the offset whether matches the type or not */ if (!xen_pt_msi_check_type(offset, msi->flags, DATA)) { @@ -1296,15 +1310,15 @@ static int xen_pt_msgdata_reg_write(XenPCIPassthroughState *s, /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* update the msi_info too */ - msi->data = cfg_entry->data; + msi->data = *data; /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, 0); /* update MSI */ - if (cfg_entry->data != old_data) { + if (*data != old_data) { if (msi->mapped) { xen_pt_msi_update(s); } @@ -1468,10 +1482,11 @@ static int xen_pt_msixctrl_reg_write(XenPCIPassthroughState *s, uint16_t writable_mask = 0; uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask); int debug_msix_enabled_old; + uint16_t *data = cfg_entry->ptr.half_word; /* modify emulate register */ writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask; - cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask); + *data = XEN_PT_MERGE_VALUE(*val, *data, writable_mask); /* create value for writing to I/O device register */ *val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask); @@ -1967,8 +1982,8 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s, break; default: assert(1); } - /* set register value */ - reg_entry->data = val; + /* set register value pointer to the data. */ + reg_entry->ptr.byte = s->dev.config + offset; } /* list add register entry */ -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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