On Tue, May 07, 2024 at 10:56:51PM -0700, Nicolin Chen wrote:
> There is an existing arm_smmu_cmdq_build_sync_cmd() so the driver should
> call it at all places other than going through arm_smmu_cmdq_build_cmd()
> separately. This helps the following patch that adds a CS_NONE quirk for
> tegra241-cmdqv driver.
>
> Note that this changes the type of CMD_SYNC in __arm_smmu_cmdq_skip_err,
> for ARM_SMMU_OPT_MSIPOLL=true cases, from previously a non-MSI one to an
> MSI one that is proven to still work by a hacking test:
> nvme: Adding to iommu group 10
> nvme: --------hacking-----------
> arm-smmu-v3: unexpected global error reported (0x00000001),
> this could be serious
> arm-smmu-v3: CMDQ error (cons 0x01000022): Illegal command
> arm-smmu-v3: skipping command in error state:
> arm-smmu-v3: 0x0000000000000000
> arm-smmu-v3: 0x0000000000000000
> nvme: -------recovered----------
> nvme nvme0: 72/0/0 default/read/poll queues
> nvme0n1: p1 p2
Nice
> @@ -350,20 +340,23 @@ static struct arm_smmu_cmdq *arm_smmu_get_cmdq(struct arm_smmu_device *smmu)
> static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu,
> struct arm_smmu_queue *q, u32 prod)
> {
> - struct arm_smmu_cmdq_ent ent = {
> - .opcode = CMDQ_OP_CMD_SYNC,
> - };
> + memset(cmd, 0, 1 << CMDQ_ENT_SZ_SHIFT);
The command would also benifit from its own type someday :\
Maybe this should just be cmd[1] = 0 ?
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Jason
