On Wed, 11 Feb 2026 17:37:06 -0800 Deborah Brouwer <[email protected]> wrote:
> From: Boris Brezillon <[email protected]> I'm pretty sure I got that from Daniel's branch, and only tweaked a few minor things to make it work (I probably messed up authorship when doing that). I'd prefer to attribute that work to Daniel, if you don't mind. > > Add register definitions and constants for managing MMU address space, > including: > - Address space translation configuration (page table format, attributes) > - Memory attributes (cacheability, shareability) > - Address space commands (update, lock, flush) > - AsRegister helper for per-AS register access > > These will be used by the MMU/VM manager to configure page tables and > control address space operations. > > Signed-off-by: Boris Brezillon <[email protected]> > Co-developed-by: Deborah Brouwer <[email protected]> > Signed-off-by: Deborah Brouwer <[email protected]> > --- > drivers/gpu/drm/tyr/regs.rs | 101 +++++++++++++++++++++++++++++++++++- > 1 file changed, 100 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/tyr/regs.rs b/drivers/gpu/drm/tyr/regs.rs > index 611870c2e6af..9cb7ab0c806a 100644 > --- a/drivers/gpu/drm/tyr/regs.rs > +++ b/drivers/gpu/drm/tyr/regs.rs > @@ -8,7 +8,10 @@ > #![allow(dead_code)] > > use kernel::{ > - bits::bit_u32, > + bits::{ > + bit_u32, > + bit_u64, // > + }, > device::{ > Bound, > Device, // > @@ -111,3 +114,99 @@ pub(crate) fn write(&self, dev: &Device<Bound>, iomem: > &Devres<IoMem>, value: u3 > pub(crate) const MMU_IRQ_CLEAR: Register<0x2004> = Register; > pub(crate) const MMU_IRQ_MASK: Register<0x2008> = Register; > pub(crate) const MMU_IRQ_STAT: Register<0x200c> = Register; > + > +pub(crate) const AS_TRANSCFG_ADRMODE_UNMAPPED: u64 = bit_u64(0); > +pub(crate) const AS_TRANSCFG_ADRMODE_AARCH64_4K: u64 = bit_u64(2) | > bit_u64(1); > +pub(crate) const AS_TRANSCFG_PTW_MEMATTR_WB: u64 = bit_u64(25); > +pub(crate) const AS_TRANSCFG_PTW_RA: u64 = bit_u64(30); > + > +pub(crate) const fn as_transcfg_ina_bits(x: u64) -> u64 { > + x << 6 > +} > + > +pub(crate) const AS_MEMATTR_AARCH64_SH_MIDGARD_INNER: u32 = 0 << 4; > +pub(crate) const AS_MEMATTR_AARCH64_INNER_OUTER_NC: u32 = 1 << 6; > +pub(crate) const AS_MEMATTR_AARCH64_INNER_OUTER_WB: u32 = 2 << 6; > + > +pub(crate) fn as_memattr_aarch64_inner_alloc_expl(w: bool, r: bool) -> u32 { > + (3 << 2) | (u32::from(w)) | ((u32::from(r)) << 1) > +} > + > +pub(crate) const AS_COMMAND_UPDATE: u32 = 1; > +pub(crate) const AS_COMMAND_LOCK: u32 = 2; > +pub(crate) const AS_COMMAND_FLUSH_PT: u32 = 4; > +pub(crate) const AS_COMMAND_FLUSH_MEM: u32 = 5; > + > +pub(crate) const AS_STATUS_ACTIVE: u32 = bit_u32(0); > + > +pub(crate) const AS_LOCK_REGION_MIN_SIZE: u32 = bit_u32(15); > + > +/// Maximum number of hardware address space slots. > +/// The actual number of slots available is usually much lower. > +pub(crate) const MAX_AS_REGISTERS: usize = 32; > + > +const MMU_BASE: usize = 0x2400; > +const MMU_AS_SHIFT: usize = 6; > + > +const fn mmu_as(as_nr: usize) -> usize { > + MMU_BASE + (as_nr << MMU_AS_SHIFT) > +} > + > +pub(crate) struct AsRegister(usize); > + > +impl AsRegister { > + fn new(as_nr: usize, offset: usize) -> Result<Self> { > + Ok(AsRegister(mmu_as(as_nr) + offset)) > + } > + > + #[inline] > + pub(crate) fn read(&self, dev: &Device<Bound>, iomem: &Devres<IoMem>) -> > Result<u32> { > + let value = (*iomem).access(dev)?.try_read32(self.0)?; > + Ok(value) > + } > + > + #[inline] > + pub(crate) fn write(&self, dev: &Device<Bound>, iomem: &Devres<IoMem>, > value: u32) -> Result { > + (*iomem).access(dev)?.try_write32(value, self.0)?; > + Ok(()) > + } > +} > + > +pub(crate) fn as_transtab_lo(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x0) > +} > + > +pub(crate) fn as_transtab_hi(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x4) > +} > + > +pub(crate) fn as_memattr_lo(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x8) > +} > + > +pub(crate) fn as_memattr_hi(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0xc) > +} > + > +pub(crate) fn as_lockaddr_lo(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x10) > +} > + > +pub(crate) fn as_lockaddr_hi(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x14) > +} > + > +pub(crate) fn as_command(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x18) > +} > + > +pub(crate) fn as_status(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x28) > +} > + > +pub(crate) fn as_transcfg_lo(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x30) > +} > +pub(crate) fn as_transcfg_hi(as_nr: usize) -> Result<AsRegister> { > + AsRegister::new(as_nr, 0x34) > +}
