tree 6f76f5c97a6947ab223f7f13716839f7f1f2ee6d
parent d104fa70db9ab59b209f9c927230b8f10e41320e
author Jake Chiang <hung-tse.chiang@fii-na.corp-partner.google.com> 1786430729 +0800
committer mdb:gbmc-git-owners <superproject-auto-update@invalid> 1786592316 -0700

i3c: mipi-i3c-hci: dma: allocate IBI data before IBI status

The coherent DMA pool allocator is page-based and uses
bitmap_find_free_region(). An allocation of 2^order pages must start
at an offset aligned to 2^order pages.

The IBI data ring requires two pages (order 1), so it must start at a
two-page aligned offset. Allocating the one-page IBI status ring first
leaves the next free page unaligned for the two-page IBI data ring.

Allocate the IBI data ring before the IBI status ring to avoid the
alignment hole and allow the DMA buffers to fit in the 20 KiB
reserved-memory region.

Tested:
```
The platform DTS was not modified for this test.
LTPI I3C and I3C hub initialization logs were omitted for clarity,
as they are unrelated to the I3C DMA reserved-memory changes.

dmesg:
root@:~# dmesg | grep i3c
[    0.000000] OF: reserved mem: initialized node i3c0-reserved@431c00000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c00000..0x0000000431c04fff (20 KiB) nomap non-reusable i3c0-reserved@431c00000
[    0.000000] OF: reserved mem: initialized node i3c1-reserved@431c05000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c05000..0x0000000431c09fff (20 KiB) nomap non-reusable i3c1-reserved@431c05000
[    0.000000] OF: reserved mem: initialized node i3c2-reserved@431c0a000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c0a000..0x0000000431c0efff (20 KiB) nomap non-reusable i3c2-reserved@431c0a000
[    0.000000] OF: reserved mem: initialized node i3c3-reserved@431c0f000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c0f000..0x0000000431c13fff (20 KiB) nomap non-reusable i3c3-reserved@431c0f000
[    0.000000] OF: reserved mem: initialized node i3c4-reserved@431c14000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c14000..0x0000000431c18fff (20 KiB) nomap non-reusable i3c4-reserved@431c14000
[    0.000000] OF: reserved mem: initialized node i3c5-reserved@431c19000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c19000..0x0000000431c1dfff (20 KiB) nomap non-reusable i3c5-reserved@431c19000
[    0.000000] OF: reserved mem: initialized node i3c6-reserved@431c1e000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c1e000..0x0000000431c22fff (20 KiB) nomap non-reusable i3c6-reserved@431c1e000
[    0.000000] OF: reserved mem: initialized node i3c7-reserved@431c23000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c23000..0x0000000431c27fff (20 KiB) nomap non-reusable i3c7-reserved@431c23000
[    0.000000] OF: reserved mem: initialized node i3c8-reserved@431c28000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c28000..0x0000000431c2cfff (20 KiB) nomap non-reusable i3c8-reserved@431c28000
[    0.000000] OF: reserved mem: initialized node i3c9-reserved@431c2d000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c2d000..0x0000000431c31fff (20 KiB) nomap non-reusable i3c9-reserved@431c2d000
[    0.000000] OF: reserved mem: initialized node i3c10-reserved@431c32000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c32000..0x0000000431c36fff (20 KiB) nomap non-reusable i3c10-reserved@431c32000
[    0.000000] OF: reserved mem: initialized node i3c11-reserved@431c37000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c37000..0x0000000431c3bfff (20 KiB) nomap non-reusable i3c11-reserved@431c37000
[    0.000000] OF: reserved mem: initialized node i3c12-reserved@431c3c000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c3c000..0x0000000431c40fff (20 KiB) nomap non-reusable i3c12-reserved@431c3c000
[    0.000000] OF: reserved mem: initialized node i3c13-reserved@431c41000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c41000..0x0000000431c45fff (20 KiB) nomap non-reusable i3c13-reserved@431c41000
[    0.000000] OF: reserved mem: initialized node i3c14-reserved@431c46000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c46000..0x0000000431c4afff (20 KiB) nomap non-reusable i3c14-reserved@431c46000
[    0.000000] OF: reserved mem: initialized node i3c15-reserved@431c4b000, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x0000000431c4b000..0x0000000431c4ffff (20 KiB) nomap non-reusable i3c15-reserved@431c4b000
.
.
.
[    5.678843]  14c26000.i3c6: MIPI I3C HCI v1.1 r00
[    5.684122]  14c26000.i3c6: DAT: 127 8-bytes entries at offset 0x100
[    5.691223]  14c26000.i3c6: DCT: 1 16-bytes entries at offset 0x500
[    5.698226]  14c26000.i3c6: Ring Headers at offset 0x800
[    5.704166]  14c26000.i3c6: PIO section at offset 0xd0
[    5.709905]  14c26000.i3c6: Extended Caps at offset 0xf00
[    5.715942]  14c26000.i3c6: vendor MIPI ID: 0x3f6
[    5.721205]  14c26000.i3c6: vendor version ID: 0x2
[    5.726559]  14c26000.i3c6: vendor product ID: 0x6020003
[    5.726566]  14c26000.i3c6: operation mode: primary/secondary master
[    5.747743]  14c26000.i3c6: INHOUSE control at offset 0xd00
[    5.753967]  14c26000.i3c6: PHY control at offset 0xe00
[    5.759821]  14c26000.i3c6: Using DMA
[    5.764180] i3c 14c26000.i3c6: Master Mode
[    5.768772] i3c 14c26000.i3c6: core rate = 250000000 core period = 4 ns
[    5.776191] i3c 14c26000.i3c6: 1 DMA rings available
[    5.781813] mipi-i3c-hci 14c26000.i3c6: assigned reserved memory node i3c6-reserved@431c1e000
[    5.791373] i3c 14c26000.i3c6: Ring 0 at offset 0x830
[    5.797872]  14c27000.i3c7: MIPI I3C HCI v1.1 r00
[    5.803157]  14c27000.i3c7: DAT: 127 8-bytes entries at offset 0x100
[    5.810257]  14c27000.i3c7: DCT: 1 16-bytes entries at offset 0x500
[    5.817267]  14c27000.i3c7: Ring Headers at offset 0x800
[    5.823210]  14c27000.i3c7: PIO section at offset 0xd0
[    5.828951]  14c27000.i3c7: Extended Caps at offset 0xf00
[    5.834994]  14c27000.i3c7: vendor MIPI ID: 0x3f6
[    5.840248]  14c27000.i3c7: vendor version ID: 0x2
[    5.840253]  14c27000.i3c7: vendor product ID: 0x6020003
[    5.840259]  14c27000.i3c7: operation mode: primary/secondary master
[    5.855123]  14c27000.i3c7: INHOUSE control at offset 0xd00
[    5.868145]  14c27000.i3c7: PHY control at offset 0xe00
[    5.882747]  14c27000.i3c7: Using DMA
[    5.910813] i3c 14c27000.i3c7: Master Mode
[    5.915397] i3c 14c27000.i3c7: core rate = 250000000 core period = 4 ns
[    5.922809] i3c 14c27000.i3c7: 1 DMA rings available
[    5.928400] mipi-i3c-hci 14c27000.i3c7: assigned reserved memory node i3c7-reserved@431c23000
[    5.937926] i3c 14c27000.i3c7: Ring 0 at offset 0x830
[    5.944308]  14c2a000.i3c10: MIPI I3C HCI v1.1 r00
[    5.949687]  14c2a000.i3c10: DAT: 127 8-bytes entries at offset 0x100
[    5.956893]  14c2a000.i3c10: DCT: 1 16-bytes entries at offset 0x500
[    5.963995]  14c2a000.i3c10: Ring Headers at offset 0x800
[    5.970025]  14c2a000.i3c10: PIO section at offset 0xd0
[    5.975866]  14c2a000.i3c10: Extended Caps at offset 0xf00
[    5.981994]  14c2a000.i3c10: vendor MIPI ID: 0x3f6
[    5.987350]  14c2a000.i3c10: vendor version ID: 0x2
[    5.992799]  14c2a000.i3c10: vendor product ID: 0x6020003
[    5.998834]  14c2a000.i3c10: operation mode: primary/secondary master
[    6.006022]  14c2a000.i3c10: INHOUSE control at offset 0xd00
[    6.012347]  14c2a000.i3c10: PHY control at offset 0xe00
[    6.018318]  14c2a000.i3c10: Using DMA
[    6.022705] i3c 14c2a000.i3c10: Master Mode
[    6.027382] i3c 14c2a000.i3c10: core rate = 250000000 core period = 4 ns
[    6.034892] i3c 14c2a000.i3c10: 1 DMA rings available
[    6.040569] mipi-i3c-hci 14c2a000.i3c10: assigned reserved memory node i3c10-reserved@431c32000
[    6.050288] i3c 14c2a000.i3c10: Ring 0 at offset 0x830
[    6.056793]  14c2b000.i3c11: MIPI I3C HCI v1.1 r00
[    6.062168]  14c2b000.i3c11: DAT: 127 8-bytes entries at offset 0x100
[    6.069373]  14c2b000.i3c11: DCT: 1 16-bytes entries at offset 0x500
[    6.076475]  14c2b000.i3c11: Ring Headers at offset 0x800
[    6.082506]  14c2b000.i3c11: PIO section at offset 0xd0
[    6.088353]  14c2b000.i3c11: Extended Caps at offset 0xf00
[    6.094483]  14c2b000.i3c11: vendor MIPI ID: 0x3f6
[    6.099839]  14c2b000.i3c11: vendor version ID: 0x2
[    6.105288]  14c2b000.i3c11: vendor product ID: 0x6020003
[    6.111323]  14c2b000.i3c11: operation mode: primary/secondary master
[    6.118509]  14c2b000.i3c11: INHOUSE control at offset 0xd00
[    6.124834]  14c2b000.i3c11: PHY control at offset 0xe00
[    6.130776]  14c2b000.i3c11: Using DMA
[    6.135082] i3c 14c2b000.i3c11: Master Mode
[    6.139765] i3c 14c2b000.i3c11: core rate = 250000000 core period = 4 ns
[    6.147277] i3c 14c2b000.i3c11: 1 DMA rings available
[    6.152954] mipi-i3c-hci 14c2b000.i3c11: assigned reserved memory node i3c11-reserved@431c37000
[    6.162680] i3c 14c2b000.i3c11: Ring 0 at offset 0x830
[    6.169054]  14c2c000.i3c12: MIPI I3C HCI v1.1 r00
[    6.174415]  14c2c000.i3c12: DAT: 127 8-bytes entries at offset 0x100
[    6.181622]  14c2c000.i3c12: DCT: 1 16-bytes entries at offset 0x500
[    6.188725]  14c2c000.i3c12: Ring Headers at offset 0x800
[    6.194759]  14c2c000.i3c12: PIO section at offset 0xd0
[    6.200595]  14c2c000.i3c12: Extended Caps at offset 0xf00
[    6.206727]  14c2c000.i3c12: vendor MIPI ID: 0x3f6
[    6.212078]  14c2c000.i3c12: vendor version ID: 0x2
[    6.217531]  14c2c000.i3c12: vendor product ID: 0x6020003
[    6.223567]  14c2c000.i3c12: operation mode: primary/secondary master
[    6.230767]  14c2c000.i3c12: INHOUSE control at offset 0xd00
[    6.237082]  14c2c000.i3c12: PHY control at offset 0xe00
[    6.243023]  14c2c000.i3c12: Using DMA
[    6.247354] i3c 14c2c000.i3c12: Master Mode
[    6.252037] i3c 14c2c000.i3c12: core rate = 250000000 core period = 4 ns
[    6.259549] i3c 14c2c000.i3c12: 1 DMA rings available
[    6.265221] mipi-i3c-hci 14c2c000.i3c12: assigned reserved memory node i3c12-reserved@431c3c000
[    6.274950] i3c 14c2c000.i3c12: Ring 0 at offset 0x830
[    6.281925]  14c2d000.i3c13: MIPI I3C HCI v1.1 r00
[    6.287297]  14c2d000.i3c13: DAT: 127 8-bytes entries at offset 0x100
[    6.294503]  14c2d000.i3c13: DCT: 1 16-bytes entries at offset 0x500
[    6.301600]  14c2d000.i3c13: Ring Headers at offset 0x800
[    6.307631]  14c2d000.i3c13: PIO section at offset 0xd0
[    6.313467]  14c2d000.i3c13: Extended Caps at offset 0xf00
[    6.319595]  14c2d000.i3c13: vendor MIPI ID: 0x3f6
[    6.324947]  14c2d000.i3c13: vendor version ID: 0x2
[    6.330395]  14c2d000.i3c13: vendor product ID: 0x6020003
[    6.336425]  14c2d000.i3c13: operation mode: primary/secondary master
[    6.343628]  14c2d000.i3c13: INHOUSE control at offset 0xd00
[    6.349949]  14c2d000.i3c13: PHY control at offset 0xe00
[    6.355886]  14c2d000.i3c13: Using DMA
[    6.360201] i3c 14c2d000.i3c13: Master Mode
[    6.364878] i3c 14c2d000.i3c13: core rate = 250000000 core period = 4 ns
[    6.372385] i3c 14c2d000.i3c13: 1 DMA rings available
[    6.378058] mipi-i3c-hci 14c2d000.i3c13: assigned reserved memory node i3c13-reserved@431c41000
[    6.387768] i3c 14c2d000.i3c13: Ring 0 at offset 0x830
[    6.394669]  14c2e000.i3c14: MIPI I3C HCI v1.1 r00
[    6.400038]  14c2e000.i3c14: DAT: 127 8-bytes entries at offset 0x100
[    6.407241]  14c2e000.i3c14: DCT: 1 16-bytes entries at offset 0x500
[    6.414340]  14c2e000.i3c14: Ring Headers at offset 0x800
[    6.420376]  14c2e000.i3c14: PIO section at offset 0xd0
[    6.426212]  14c2e000.i3c14: Extended Caps at offset 0xf00
[    6.432344]  14c2e000.i3c14: vendor MIPI ID: 0x3f6
[    6.437694]  14c2e000.i3c14: vendor version ID: 0x2
[    6.443147]  14c2e000.i3c14: vendor product ID: 0x6020003
[    6.449181]  14c2e000.i3c14: operation mode: primary/secondary master
[    6.456380]  14c2e000.i3c14: INHOUSE control at offset 0xd00
[    6.462696]  14c2e000.i3c14: PHY control at offset 0xe00
[    6.468633]  14c2e000.i3c14: Using DMA
[    6.472976] i3c 14c2e000.i3c14: Master Mode
[    6.477653] i3c 14c2e000.i3c14: core rate = 250000000 core period = 4 ns
[    6.485165] i3c 14c2e000.i3c14: 1 DMA rings available
[    6.490842] mipi-i3c-hci 14c2e000.i3c14: assigned reserved memory node i3c14-reserved@431c46000
[    6.500566] i3c 14c2e000.i3c14: Ring 0 at offset 0x830
[    6.507418]  14c2f000.i3c15: MIPI I3C HCI v1.1 r00
[    6.512802]  14c2f000.i3c15: DAT: 127 8-bytes entries at offset 0x100
[    6.520006]  14c2f000.i3c15: DCT: 1 16-bytes entries at offset 0x500
[    6.527113]  14c2f000.i3c15: Ring Headers at offset 0x800
[    6.533144]  14c2f000.i3c15: PIO section at offset 0xd0
[    6.538985]  14c2f000.i3c15: Extended Caps at offset 0xf00
[    6.545113]  14c2f000.i3c15: vendor MIPI ID: 0x3f6
[    6.550472]  14c2f000.i3c15: vendor version ID: 0x2
[    6.555925]  14c2f000.i3c15: vendor product ID: 0x6020003
[    6.561948]  14c2f000.i3c15: operation mode: primary/secondary master
[    6.569147]  14c2f000.i3c15: INHOUSE control at offset 0xd00
[    6.575465]  14c2f000.i3c15: PHY control at offset 0xe00
[    6.581402]  14c2f000.i3c15: Using DMA
[    6.585717] i3c 14c2f000.i3c15: Master Mode
[    6.590393] i3c 14c2f000.i3c15: core rate = 250000000 core period = 4 ns
[    6.597905] i3c 14c2f000.i3c15: 1 DMA rings available
[    6.603583] mipi-i3c-hci 14c2f000.i3c15: assigned reserved memory node i3c15-reserved@431c4b000
[    6.613307] i3c 14c2f000.i3c15: Ring 0 at offset 0x830

I3C Hub debugfs access:
root@:/sys/kernel/debug/i3c-hub-12-4cd34a94119/reg# echo 0 > offset && cat access
0x87
root@:/sys/kernel/debug/i3c-hub-12-4cd34a94119/reg# cd ..
root@:/sys/kernel/debug/i3c-hub-12-4cd34a94119# cd ..
root@:/sys/kernel/debug# cd i3c-hub-13-4cd86a14119/
root@:/sys/kernel/debug/i3c-hub-13-4cd86a14119# cd reg/
root@:/sys/kernel/debug/i3c-hub-13-4cd86a14119/reg# echo 0 > offset && cat access
0x87
root@:/sys/kernel/debug/i3c-hub-13-4cd86a14119/reg# cd ../../
root@:/sys/kernel/debug# cd i3c-hub-14-4cd8ea7411d/reg/
root@:/sys/kernel/debug/i3c-hub-14-4cd8ea7411d/reg# echo 0 > offset && cat access
0x87
root@:/sys/kernel/debug/i3c-hub-14-4cd8ea7411d/reg# cd ../../
root@:/sys/kernel/debug# cd i3c-hub-15-4cd2ab34115/reg/
root@:/sys/kernel/debug/i3c-hub-15-4cd2ab34115/reg# echo 0 > offset && cat access
0x87
```

Google-Bug-Id: 542414147
Change-Id: I288fdf8482fbabbc4fb0ada526c8982175076d32
Signed-off-by: Jake Chiang <hung-tse.chiang@fii-na.corp-partner.google.com>