soc: qcom: subsys-pil-tz: use memcpy_toio() for pil_init_image_trusted()

The new optimized memcmp doesn't work well on device memory, and when subsys tries to load any fw, we are met with:

[   11.111213] ueventd: firmware: loading 'cdsp.mdt' for '/devices/platform/soc/8300000.qcom,turing/firmware/cdsp.mdt'
[   11.113128] ueventd: loading /devices/platform/soc/8300000.qcom,turing/firmware/cdsp.mdt took 2ms
[   11.113170] subsys-pil-tz 8300000.qcom,turing: cdsp: loading from 0x0000000099100000 to 0x000000009a500000
[   11.117481] ueventd: firmware: loading 'adsp.mdt' for '/devices/platform/soc/17300000.qcom,lpass/firmware/adsp.mdt'
[   11.117518] Unable to handle kernel paging request at virtual address ffffff801f7c6d5c
[   11.117522] Mem abort info:
[   11.117525]   Exception class = DABT (current EL), IL = 32 bits
[   11.117527]   SET = 0, FnV = 0
[   11.117529]   EA = 0, S1PTW = 0
[   11.117530]   FSC = 33
[   11.117532] Data abort info:
[   11.117534]   ISV = 0, ISS = 0x00000061
[   11.117536]   CM = 0, WnR = 1
[   11.117539] swapper pgtable: 4k pages, 39-bit VAs, pgd = 000000003e4fd651
[   11.117541] [ffffff801f7c6d5c] *pgd=00000001f8883003, *pud=00000001f8883003, *pmd=00000001f30fe003, *pte=00680000fd475703
[   11.117547] Internal error: Oops: 96000061 [xiaomi-sm8250-devs#1] PREEMPT SMP
[   11.117551] Modules linked in:
[   11.117554] Process init (pid: 568, stack limit = 0x000000005be89f40)
[   11.117558] CPU: 4 PID: 568 Comm: init Tainted: G S      W       4.14.239-MOCHI xiaomi-sm8250-devs#1
[   11.117560] Hardware name: Qualcomm Technologies, Inc. SM8150 V2 PM8150 VAYU (DT)
[   11.117562] task: 00000000e65c9d8d task.stack: 000000005be89f40
[   11.117570] pc : memcpy+0x188/0x2a0
[   11.117577] lr : pil_init_image_trusted+0x130/0x234
[   11.117579] sp : ffffff80229937c0 pstate : 80000145
[   11.117581] x29: ffffff80229937c0 x28: ffffffeaebf93a00
[   11.117584] x27: ffffff8599334000 x26: 0000000000000040
[   11.117586] x25: ffffff859a0aeaa0 x24: ffffff859a63a000
[   11.117589] x23: ffffffeaf557d880 x22: ffffff801f7c5000
[   11.117592] x21: 0000000000001d9c x20: ffffff801f65d000
[   11.117594] x19: ffffff859933cb08 x18: 0000007c2b138000
[   11.117597] x17: 0000007ebf1ef1e4 x16: ffffff8597c02274
[   11.117599] x15: ffffffffffffffff x14: ffffffffffffffff
[   11.117602] x13: ffffffffffffffff x12: ffffffffffffffff
[   11.117604] x11: ffffffffffffffff x10: ffffffffffffffff
[   11.117607] x9 : ffffffffffffffff x8 : ffffffffffffffff
[   11.117609] x7 : ffffffffffffffff x6 : ffffffffffffffff
[   11.117612] x5 : ffffff801f7c6d9c x4 : ffffff801f65ed9c
[   11.117614] x3 : ffffff801f7c6d40 x2 : ffffffffffffffcc
[   11.117617] x1 : ffffff801f65ed80 x0 : ffffff801f7c5000
[   11.117620]
[   11.117620] PC: 0xffffff8598c00e28:
[   11.117622] 0e28  a9022468 a9422428 a9032c6a a9432c2a a984346c a9c4342c f1010042 54fffee8
[   11.117628] 0e48  a97c3c8e a9011c66 a97d1c86 a9022468 a97e2488 a9032c6a a97f2c8a a904346c
[   11.117634] 0e68  a93c3cae a93d1ca6 a93e24a8 a93f2caa d65f03c0 d503201f a97f348c 92400cae
[   11.117639] 0e88  cb0e0084 cb0e0042 a97f1c86 a93f34ac a97e2488 a97d2c8a a9fc348c cb0e00a5
[   11.117645]
[   11.117645] LR: 0xffffff8597ef067c:
[   11.117647] 067c  97eeeccc f9400265 b4fffe65 52801803 910143e2 aa1503e1 910183e0 d2804004
[   11.117652] 069c  72a02803 d63f00a0 aa0003f6 17ffffe9 aa1403e1 aa1503e2 aa1603e0 9434418a
[   11.117658] 06bc  97ff9590 72001c1f b9404ae1 f9402be0 54000241 910133e4 910163e2 d2800085
[   11.117663] 06dc  d2800103 290b03e1 52800021 52800040 97ff9657 2a0003f3 f9413bf4 f9402bf7
[   11.117669]
[   11.117669] SP: 0xffffff8022993780:
[   11.117671] 3780  98c00e68 ffffff85 80000145 00000000 9a0aeaa0 ffffff85 00000040 00000000
[   11.117677] 37a0  ffffffff 0000007f 97ef0644 ffffff85 229937c0 ffffff80 98c00e68 ffffff85
[   11.117682] 37c0  22993ba0 ffffff80 97eeec4c ffffff85 f557d918 ffffffea 00000000 00000000
[   11.117688] 37e0  f6264460 ffffffea f6264400 ffffffea f55b9480 ffffffea 97b704d8 ffffff85
[   11.117693]
[   11.117695] Call trace:
[   11.117698]  memcpy+0x188/0x2a0
[   11.117701]  pil_boot+0x358/0x730
[   11.117704]  subsys_powerup+0x28/0x30
[   11.117709]  subsys_start+0x38/0x134
[   11.117711]  __subsystem_get+0xb0/0x11c
[   11.117713]  subsystem_get+0x10/0x18
[   11.117716]  cdsp_loader_do.isra.0+0xe4/0x1a8
[   11.117718]  cdsp_boot_store+0x8c/0x168
[   11.117722]  kobj_attr_store+0x14/0x24
[   11.117726]  sysfs_kf_write+0x34/0x44
[   11.117729]  kernfs_fop_write+0x118/0x184
[   11.117733]  __vfs_write+0x2c/0xd8
[   11.117735]  vfs_write+0x80/0xec
[   11.117738]  SyS_write+0x54/0xac
[   11.117741]  el0_svc_naked+0x34/0x38
[   11.117744] Code: a97e2488 a9032c6a a97f2c8a a904346c (a93c3cae)
[   11.117747] ---[ end trace fc45fc8b1fa34513 ]---

by looking at the link register we track it back to the function and use the alternative to fix it.

test: device boots with the new optimized string routines

drivers/soc/qcom/subsys-pil-tz.c

@@ -629,7 +629,7 @@ static int pil_init_image_trusted(struct pil_desc *pil,
 		return -ENOMEM;
 	}
 
-	memcpy(mdata_buf, metadata, size);
+	memcpy_toio((void __iomem *)mdata_buf, metadata, size);
 
 	desc.args[0] = d->pas_id;
 	desc.args[1] = mdata_phys;