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pci: Introduce and use PciBar struct

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This simplies some of the handling for PCI BARs particularly with
respect to snapshot and restore. No attempt has been made to handle the
64-bit bar handling in a different manner to that which was used before.

Fixes: #1153

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-07-14 15:09:20 +01:00 committed by Sebastien Boeuf
parent cbb1f4cc2d
commit dc55e45977
1 changed files with 46 additions and 51 deletions
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97
pci/src/configuration.rs
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@ -277,14 +277,19 @@ fn decode_64_bits_bar_size(bar_size_hi: u32, bar_size_lo: u32) -> Option<u64> {
None
}
#[derive(Serialize, Deserialize, Default, Clone, Copy)]
struct PciBar {
addr: u32,
size: u32,
used: bool,
r#type: Option<PciBarRegionType>,
}
#[derive(Serialize, Deserialize)]
struct PciConfigurationState {
registers: Vec<u32>,
writable_bits: Vec<u32>,
bar_addr: Vec<u32>,
bar_size: Vec<u32>,
bar_used: Vec<bool>,
bar_type: Vec<Option<PciBarRegionType>>,
bars: Vec<PciBar>,
rom_bar_addr: u32,
rom_bar_size: u32,
rom_bar_used: bool,
@ -298,10 +303,7 @@ struct PciConfigurationState {
pub struct PciConfiguration {
registers: [u32; NUM_CONFIGURATION_REGISTERS],
writable_bits: [u32; NUM_CONFIGURATION_REGISTERS], // writable bits for each register.
bar_addr: [u32; NUM_BAR_REGS],
bar_size: [u32; NUM_BAR_REGS],
bar_used: [bool; NUM_BAR_REGS],
bar_type: [Option<PciBarRegionType>; NUM_BAR_REGS],
bars: [PciBar; NUM_BAR_REGS],
rom_bar_addr: u32,
rom_bar_size: u32,
rom_bar_used: bool,
@ -404,8 +406,6 @@ impl PciConfiguration {
) -> Self {
let mut registers = [0u32; NUM_CONFIGURATION_REGISTERS];
let mut writable_bits = [0u32; NUM_CONFIGURATION_REGISTERS];
let bar_addr = [0u32; NUM_BAR_REGS];
let bar_size = [0u32; NUM_BAR_REGS];
registers[0] = u32::from(device_id) << 16 | u32::from(vendor_id);
// TODO(dverkamp): Status should be write-1-to-clear
writable_bits[1] = 0x0000_ffff; // Status (r/o), command (r/w)
@ -432,13 +432,12 @@ impl PciConfiguration {
};
registers[11] = u32::from(subsystem_id) << 16 | u32::from(subsystem_vendor_id);
let bars = [PciBar::default(); NUM_BAR_REGS];
PciConfiguration {
registers,
writable_bits,
bar_addr,
bar_size,
bar_used: [false; NUM_BAR_REGS],
bar_type: [None; NUM_BAR_REGS],
bars,
rom_bar_addr: 0,
rom_bar_size: 0,
rom_bar_used: false,
@ -452,10 +451,7 @@ impl PciConfiguration {
PciConfigurationState {
registers: self.registers.to_vec(),
writable_bits: self.writable_bits.to_vec(),
bar_addr: self.bar_addr.to_vec(),
bar_size: self.bar_size.to_vec(),
bar_used: self.bar_used.to_vec(),
bar_type: self.bar_type.to_vec(),
bars: self.bars.to_vec(),
rom_bar_addr: self.rom_bar_addr,
rom_bar_size: self.rom_bar_size,
rom_bar_used: self.rom_bar_used,
@ -468,10 +464,7 @@ impl PciConfiguration {
self.registers.clone_from_slice(state.registers.as_slice());
self.writable_bits
.clone_from_slice(state.writable_bits.as_slice());
self.bar_addr.clone_from_slice(state.bar_addr.as_slice());
self.bar_size.clone_from_slice(state.bar_size.as_slice());
self.bar_used.clone_from_slice(state.bar_used.as_slice());
self.bar_type.clone_from_slice(state.bar_type.as_slice());
self.bars.clone_from_slice(state.bars.as_slice());
self.rom_bar_addr = state.rom_bar_addr;
self.rom_bar_size = state.rom_bar_size;
self.rom_bar_used = state.rom_bar_used;
@ -492,7 +485,7 @@ impl PciConfiguration {
// Handle very specific case where the BAR is being written with
// all 1's to retrieve the BAR size during next BAR reading.
if value == 0xffff_ffff {
mask &= self.bar_size[reg_idx - 4];
mask &= self.bars[reg_idx - 4].size;
}
} else if reg_idx == ROM_BAR_REG {
// Handle very specific case where the BAR is being written with
@ -561,7 +554,7 @@ impl PciConfiguration {
/// (i.e, region size must be power of two, register not already used). Returns 'None' on
/// failure all, `Some(BarIndex)` on success.
pub fn add_pci_bar(&mut self, config: &PciBarConfiguration) -> Result<usize> {
if self.bar_used[config.reg_idx] {
if self.bars[config.reg_idx].used {
return Err(Error::BarInUse(config.reg_idx));
}
@ -586,7 +579,7 @@ impl PciConfiguration {
// Encode the BAR size as expected by the software running in
// the guest.
self.bar_size[config.reg_idx] =
self.bars[config.reg_idx].size =
encode_32_bits_bar_size(config.size as u32).ok_or(Error::Encode32BarSize)?;
}
PciBarRegionType::Memory64BitRegion => {
@ -598,7 +591,7 @@ impl PciConfiguration {
return Err(Error::BarAddressInvalid(config.addr, config.size));
}
if self.bar_used[config.reg_idx + 1] {
if self.bars[config.reg_idx + 1].used {
return Err(Error::BarInUse64(config.reg_idx));
}
@ -609,10 +602,10 @@ impl PciConfiguration {
self.registers[bar_idx + 1] = (config.addr >> 32) as u32;
self.writable_bits[bar_idx + 1] = 0xffff_ffff;
self.bar_addr[config.reg_idx + 1] = self.registers[bar_idx + 1];
self.bar_size[config.reg_idx] = bar_size_lo;
self.bar_size[config.reg_idx + 1] = bar_size_hi;
self.bar_used[config.reg_idx + 1] = true;
self.bars[config.reg_idx + 1].addr = self.registers[bar_idx + 1];
self.bars[config.reg_idx].size = bar_size_lo;
self.bars[config.reg_idx + 1].size = bar_size_hi;
self.bars[config.reg_idx + 1].used = true;
}
}
@ -626,9 +619,9 @@ impl PciConfiguration {
self.registers[bar_idx] = ((config.addr as u32) & mask) | lower_bits;
self.writable_bits[bar_idx] = mask;
self.bar_addr[config.reg_idx] = self.registers[bar_idx];
self.bar_used[config.reg_idx] = true;
self.bar_type[config.reg_idx] = Some(config.region_type);
self.bars[config.reg_idx].addr = self.registers[bar_idx];
self.bars[config.reg_idx].used = true;
self.bars[config.reg_idx].r#type = Some(config.region_type);
Ok(config.reg_idx)
}
@ -668,11 +661,11 @@ impl PciConfiguration {
pub fn get_bar_addr(&self, bar_num: usize) -> u64 {
let bar_idx = BAR0_REG + bar_num;
let mut addr = u64::from(self.bar_addr[bar_num] & self.writable_bits[bar_idx]);
let mut addr = u64::from(self.bars[bar_num].addr & self.writable_bits[bar_idx]);
if let Some(bar_type) = self.bar_type[bar_num] {
if let Some(bar_type) = self.bars[bar_num].r#type {
if bar_type == PciBarRegionType::Memory64BitRegion {
addr |= u64::from(self.bar_addr[bar_num + 1]) << 32;
addr |= u64::from(self.bars[bar_num + 1].addr) << 32;
}
}
@ -777,11 +770,11 @@ impl PciConfiguration {
let mask = self.writable_bits[reg_idx];
if reg_idx >= BAR0_REG && reg_idx < BAR0_REG + NUM_BAR_REGS {
let bar_idx = reg_idx - 4;
if (value & mask) != (self.bar_addr[bar_idx] & mask) {
if (value & mask) != (self.bars[bar_idx].addr & mask) {
// Handle special case where the address being written is
// different from the address initially provided. This is a
// BAR reprogramming case which needs to be properly caught.
if let Some(bar_type) = self.bar_type[bar_idx] {
if let Some(bar_type) = self.bars[bar_idx].r#type {
match bar_type {
PciBarRegionType::Memory64BitRegion => {}
_ => {
@ -795,16 +788,16 @@ impl PciConfiguration {
"DETECT BAR REPROG: current 0x{:x}, new 0x{:x}",
self.registers[reg_idx], value
);
let old_base = u64::from(self.bar_addr[bar_idx] & mask);
let old_base = u64::from(self.bars[bar_idx].addr & mask);
let new_base = u64::from(value & mask);
let len = u64::from(
decode_32_bits_bar_size(self.bar_size[bar_idx])
decode_32_bits_bar_size(self.bars[bar_idx].size)
.ok_or(Error::Decode32BarSize)
.unwrap(),
);
let region_type = bar_type;
self.bar_addr[bar_idx] = value;
self.bars[bar_idx].addr = value;
return Some(BarReprogrammingParams {
old_base,
@ -816,7 +809,7 @@ impl PciConfiguration {
}
} else if (reg_idx > BAR0_REG)
&& (self.registers[reg_idx - 1] & self.writable_bits[reg_idx - 1])
!= (self.bar_addr[bar_idx - 1] & self.writable_bits[reg_idx - 1])
!= (self.bars[bar_idx - 1].addr & self.writable_bits[reg_idx - 1])
{
// Ignore the case where the BAR size is being asked for.
// Because we are in the 64bits case here, we have to check
@ -824,7 +817,7 @@ impl PciConfiguration {
// asked for the BAR size too.
if value == 0xffff_ffff
&& self.registers[reg_idx - 1] & self.writable_bits[reg_idx - 1]
== self.bar_size[bar_idx - 1] & self.writable_bits[reg_idx - 1]
== self.bars[bar_idx - 1].size & self.writable_bits[reg_idx - 1]
{
return None;
}
@ -833,18 +826,20 @@ impl PciConfiguration {
"DETECT BAR REPROG: current 0x{:x}, new 0x{:x}",
self.registers[reg_idx], value
);
let old_base = u64::from(self.bar_addr[bar_idx] & mask) << 32
| u64::from(self.bar_addr[bar_idx - 1] & self.writable_bits[reg_idx - 1]);
let old_base = u64::from(self.bars[bar_idx].addr & mask) << 32
| u64::from(self.bars[bar_idx - 1].addr & self.writable_bits[reg_idx - 1]);
let new_base = u64::from(value & mask) << 32
| u64::from(self.registers[reg_idx - 1] & self.writable_bits[reg_idx - 1]);
let len =
decode_64_bits_bar_size(self.bar_size[bar_idx], self.bar_size[bar_idx - 1])
.ok_or(Error::Decode64BarSize)
.unwrap();
let len = decode_64_bits_bar_size(
self.bars[bar_idx].size,
self.bars[bar_idx - 1].size,
)
.ok_or(Error::Decode64BarSize)
.unwrap();
let region_type = PciBarRegionType::Memory64BitRegion;
self.bar_addr[bar_idx] = value;
self.bar_addr[bar_idx - 1] = self.registers[reg_idx - 1];
self.bars[bar_idx].addr = value;
self.bars[bar_idx - 1].addr = self.registers[reg_idx - 1];
return Some(BarReprogrammingParams {
old_base,