mirror of
https://github.com/Droid-Deck/DroidDeck.git
synced 2026-10-14 19:27:09 -04:00
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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* Adreno revisions the runtime's Turnip does not know, reported as the revision it does.
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*
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* Retail SM8850 phones report their A840 as chip_id 0x44050A21 (KGSL gpu_model "Adreno840v2").
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* Mesa only lists 0x44050A31, so the runtime's glibc Turnip refuses the device outright
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* ("device (chip_id = 44050A21, gpu_id = 6860) is unsupported") and gamescope exits before Steam
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* starts. Banners-Turnip fixes its own builds by registering the v2 id on the same A840 GPU info
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* (patches/a840v2.py); answering KGSL's device-info query with the known id has the same effect
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* on any Turnip in the session, including the one the runtime was built with. A driver that
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* already knows the v2 id resolves the rewritten one to the same entry.
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*
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* Only the KGSL device-info property is touched. Its layout is the kernel's uapi (msm_kgsl.h).
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*/
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#define _GNU_SOURCE 1
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#include <stddef.h>
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#include <sys/ioctl.h>
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struct kgsl_devinfo {
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unsigned int device_id;
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unsigned int chip_id;
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unsigned int mmu_enabled;
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unsigned long gmem_gpubaseaddr;
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unsigned int gpu_id;
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size_t gmem_sizebytes;
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};
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struct kgsl_device_getproperty {
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unsigned int type;
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void *value;
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size_t sizebytes;
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};
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#define KGSL_IOC_TYPE 0x09
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#define IOCTL_KGSL_DEVICE_GETPROPERTY _IOWR(KGSL_IOC_TYPE, 0x2, struct kgsl_device_getproperty)
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#define KGSL_PROP_DEVICE_INFO 0x1
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static const struct {
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unsigned int reported;
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unsigned int known;
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} CHIP_IDS[] = {
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{0x44050A21, 0x44050A31}, /* Adreno 840v2 -> Adreno 840 */
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};
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void bl_kgsl_chip_id_fixup(unsigned long request, void *arg, int rc) {
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if (rc != 0 || request != IOCTL_KGSL_DEVICE_GETPROPERTY || arg == NULL) return;
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struct kgsl_device_getproperty *prop = arg;
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if (prop->type != KGSL_PROP_DEVICE_INFO || prop->value == NULL
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|| prop->sizebytes < sizeof(struct kgsl_devinfo)) {
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return;
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}
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struct kgsl_devinfo *info = prop->value;
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for (size_t i = 0; i < sizeof(CHIP_IDS) / sizeof(CHIP_IDS[0]); i++) {
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if (info->chip_id == CHIP_IDS[i].reported) {
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info->chip_id = CHIP_IDS[i].known;
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return;
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}
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}
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}
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