rust: io: make IoMem and ExclusiveIoMem lifetime-parameterized

Add a lifetime parameter to IoMem<'a, SIZE> and ExclusiveIoMem<'a,
SIZE>, storing a &'a Device<Bound> reference to tie the mapping to the
device's lifetime.

This mirrors the pci::Bar<'a, SIZE> design and enables drivers to hold
I/O memory mappings directly in their HRT private data, tied to the
device lifetime.

IoRequest::iomap_* methods now return the mapping directly instead of
wrapping it in Devres. Callers that need device-managed revocation can
call the new into_devres() method.

Acked-by: Uwe Kleine-König <ukleinek@kernel.org>
Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260525202921.124698-20-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

2 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/drm/tyr/driver.rs b/drivers/gpu/drm/tyr/driver.rs
index 797f09e23a4c..04f83fcf0937 100644
--- a/drivers/gpu/drm/tyr/driver.rs
+++ b/drivers/gpu/drm/tyr/driver.rs
@@ -37,7 +37,7 @@ use crate::{
     regs, //
 };
 
-pub(crate) type IoMem = kernel::io::mem::IoMem<SZ_2M>;
+pub(crate) type IoMem = kernel::io::mem::IoMem<'static, SZ_2M>;
 
 pub(crate) struct TyrDrmDriver;
 
@@ -110,7 +110,7 @@ impl platform::Driver for TyrPlatformDriverData {
         let sram_regulator = Regulator::<regulator::Enabled>::get(pdev.as_ref(), c"sram")?;
 
         let request = pdev.io_request_by_index(0).ok_or(ENODEV)?;
-        let iomem = Arc::pin_init(request.iomap_sized::<SZ_2M>(), GFP_KERNEL)?;
+        let iomem = Arc::new(request.iomap_sized::<SZ_2M>()?.into_devres()?, GFP_KERNEL)?;
 
         issue_soft_reset(pdev.as_ref(), &iomem)?;
         gpu::l2_power_on(pdev.as_ref(), &iomem)?;
diff --git a/drivers/pwm/pwm_th1520.rs b/drivers/pwm/pwm_th1520.rs
index 6c5b791f3153..48808cd80737 100644
--- a/drivers/pwm/pwm_th1520.rs
+++ b/drivers/pwm/pwm_th1520.rs
@@ -92,7 +92,7 @@ struct Th1520WfHw {
 #[pin_data(PinnedDrop)]
 struct Th1520PwmDriverData {
     #[pin]
-    iomem: devres::Devres<IoMem<TH1520_PWM_REG_SIZE>>,
+    iomem: devres::Devres<IoMem<'static, TH1520_PWM_REG_SIZE>>,
     clk: Clk,
 }
 
@@ -352,7 +352,7 @@ impl platform::Driver for Th1520PwmPlatformDriver {
             dev,
             TH1520_MAX_PWM_NUM,
             try_pin_init!(Th1520PwmDriverData {
-                iomem <- request.iomap_sized::<TH1520_PWM_REG_SIZE>(),
+                iomem <- request.iomap_sized::<TH1520_PWM_REG_SIZE>()?.into_devres(),
                 clk <- clk,
             }),
         )?;