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anv/xe: detect the newer xe.ko memory reporting model and act accordingly

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Kernel commit d2d5f6d57884 ("drm/xe: Increase the XE_PL_TT watermark")
changed how xe.ko reportes memory: its ioctls now report 100% of the
system RAM as available. Since our policy is to report 50% of the SRAM
as available for the heaps, add some code to check the amount reported
by xe.ko against the amount reported by the system, then act
accordingly.

Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28513>
This commit is contained in:
Paulo Zanoni 2025-03-25 16:39:06 -07:00 • committed by Marge Bot
parent 3db8931d4a
commit 02e896bc49
1 changed files with 21 additions and 2 deletions
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23
src/intel/vulkan/anv_physical_device.c
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@ -1971,8 +1971,27 @@ static uint64_t
anv_restrict_sys_heap_size(struct anv_physical_device *device,
uint64_t kmd_reported_sram)
{
if (device->info.kmd_type == INTEL_KMD_TYPE_XE)
return kmd_reported_sram;
if (device->info.kmd_type == INTEL_KMD_TYPE_XE) {
uint64_t sys_reported_sram;
if (!os_get_total_physical_memory(&sys_reported_sram))
return kmd_reported_sram;
/* From what I could gather, kmd_reported_sram always seems to be
* exactly half of sys_reported_sram in older Kernels, but let's leave
* some room for imprecision here in case the interfaces chosen to
* report memory end up changing, accounting things differently somehow.
*
* If we detect an older Kernel (i.e., kmd_reported_sram == ~50% of
* sys_reported_sram) we just return the values reported by the KMD
* since they are already restricted. If we detect a newer Kernel, we
* deal with the value below, along with i915.ko (which is expected to
* always report 100% of SRAM).
*/
uint64_t ratio = kmd_reported_sram * 10 / sys_reported_sram;
assert(ratio <= 11);
if (ratio <= 6)
return kmd_reported_sram;
}
return kmd_reported_sram / 2;
}