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drm/xe: Add xe_device_asid_to_vm helper

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Introduce the xe_device_asid_to_vm helper, which can be used throughout
the driver to resolve the VM from a given ASID.

v4:
 - Move forward declare after includes (Stuart)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Tested-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patch.msgid.link/20260116221731.868657-5-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2026-01-16 14:17:24 -08:00
parent dea333b244
commit 43c3e6eacb
2 changed files with 29 additions and 0 deletions
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25
drivers/gpu/drm/xe/xe_device.c
View File

@ -1375,3 +1375,28 @@ const char *xe_wedged_mode_to_string(enum xe_wedged_mode mode)
return "<invalid>";
}
}
/**
* xe_device_asid_to_vm() - Find VM from ASID
* @xe: the &xe_device
* @asid: Address space ID
*
* Find a VM from ASID and take a reference to VM which caller must drop.
* Reclaim safe.
*
* Return: VM on success, ERR_PTR on failure
*/
struct xe_vm *xe_device_asid_to_vm(struct xe_device *xe, u32 asid)
{
struct xe_vm *vm;
down_read(&xe->usm.lock);
vm = xa_load(&xe->usm.asid_to_vm, asid);
if (vm)
xe_vm_get(vm);
else
vm = ERR_PTR(-EINVAL);
up_read(&xe->usm.lock);
return vm;
}

4
drivers/gpu/drm/xe/xe_device.h
View File

@ -12,6 +12,8 @@
#include "xe_gt_types.h"
#include "xe_sriov.h"
struct xe_vm;
static inline struct xe_device *to_xe_device(const struct drm_device *dev)
{
return container_of(dev, struct xe_device, drm);
@ -204,6 +206,8 @@ int xe_is_injection_active(void);
bool xe_is_xe_file(const struct file *file);
struct xe_vm *xe_device_asid_to_vm(struct xe_device *xe, u32 asid);
/*
* Occasionally it is seen that the G2H worker starts running after a delay of more than
* a second even after being queued and activated by the Linux workqueue subsystem. This