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The commands to the controller are sent in fixed sized chunks which are set per-chip-generation and stashed in iomb_size. The driver fills in structs matching the register layout and memcpy this to memory shared with the controller. However, there are two problem cases: 1) Things like phy_start_req are too large because they share the sas_identify_frame definition with libsas, and it includes the crc word. This means that it's overwriting the start of the next command block, that's ok except if it happens at the end of the shared memory area. 2) Things like set_nvm_data_req which are shared between the HAL layers. This means that it's sending 'random' data for things that are in the reserved area. So far we haven't found a case where the controller FW cares, but sending possible gibberish (for most of the structures this is in the reserved area so previously zeroed) is not recommended. Link: https://lore.kernel.org/r/20191114100910.6153-9-deepak.ukey@microchip.com Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com> Signed-off-by: peter chang <dpf@google.com> Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com> Signed-off-by: Viswas G <Viswas.G@microchip.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| .. | ||
| Makefile | ||
| pm80xx_hwi.c | ||
| pm80xx_hwi.h | ||
| pm8001_chips.h | ||
| pm8001_ctl.c | ||
| pm8001_ctl.h | ||
| pm8001_defs.h | ||
| pm8001_hwi.c | ||
| pm8001_hwi.h | ||
| pm8001_init.c | ||
| pm8001_sas.c | ||
| pm8001_sas.h | ||