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xen/pt: consolidate PM capability emu_mask 

There's no point in xen_pt_pmcsr_reg_{read,write}() each ORing
PCI_PM_CTRL_STATE_MASK and PCI_PM_CTRL_NO_SOFT_RESET into a local
emu_mask variable - we can have the same effect by setting the field
descriptor's emu_mask member suitably right away. Note that
xen_pt_pmcsr_reg_write() is being retained in order to allow later
patches to be less intrusive.

This is a preparatory patch for XSA-131.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
This commit is contained in:
Jan Beulich 2015-06-02 15:07:01 +00:00 committed by Stefano Stabellini
parent d1d35cf4ff
commit d61bb2482d
1 changed files with 4 additions and 21 deletions
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25
hw/xen/xen_pt_config_init.c
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@ -933,38 +933,21 @@ static XenPTRegInfo xen_pt_emu_reg_pcie[] = {
* Power Management Capability
*/
/* read Power Management Control/Status register */
static int xen_pt_pmcsr_reg_read(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
uint16_t *value, uint16_t valid_mask)
{
XenPTRegInfo *reg = cfg_entry->reg;
uint16_t valid_emu_mask = reg->emu_mask;
valid_emu_mask |= PCI_PM_CTRL_STATE_MASK | PCI_PM_CTRL_NO_SOFT_RESET;
valid_emu_mask = valid_emu_mask & valid_mask;
*value = XEN_PT_MERGE_VALUE(*value, cfg_entry->data, ~valid_emu_mask);
return 0;
}
/* write Power Management Control/Status register */
static int xen_pt_pmcsr_reg_write(XenPCIPassthroughState *s,
XenPTReg *cfg_entry, uint16_t *val,
uint16_t dev_value, uint16_t valid_mask)
{
XenPTRegInfo *reg = cfg_entry->reg;
uint16_t emu_mask = reg->emu_mask;
uint16_t writable_mask = 0;
uint16_t throughable_mask = 0;
emu_mask |= PCI_PM_CTRL_STATE_MASK | PCI_PM_CTRL_NO_SOFT_RESET;
/* modify emulate register */
writable_mask = emu_mask & ~reg->ro_mask & valid_mask;
writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;
cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);
/* create value for writing to I/O device register */
throughable_mask = ~emu_mask & valid_mask;
throughable_mask = ~reg->emu_mask & valid_mask;
*val = XEN_PT_MERGE_VALUE(*val, dev_value, throughable_mask);
return 0;
@ -1000,9 +983,9 @@ static XenPTRegInfo xen_pt_emu_reg_pm[] = {
.size = 2,
.init_val = 0x0008,
.ro_mask = 0xE1FC,
.emu_mask = 0x8100,
.emu_mask = 0x810B,
.init = xen_pt_common_reg_init,
.u.w.read = xen_pt_pmcsr_reg_read,
.u.w.read = xen_pt_word_reg_read,
.u.w.write = xen_pt_pmcsr_reg_write,
},
{