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iommu/arm-smmu: Skip the execution of CMD_PREFETCH_CONFIG

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Hisilicon SMMUv3 devices treat CMD_PREFETCH_CONFIG as a illegal command,
execute it will trigger GERROR interrupt. Although the gerror code manage
to turn the prefetch into a SYNC, and the system can continue to run
normally, but it's ugly to print error information.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
[will: extended binding documentation]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Zhen Lei 2015-07-07 04:30:18 +01:00 committed by Will Deacon
parent e2f4c2330f
commit 5e92946c39
2 changed files with 34 additions and 1 deletions
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3
Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
View File

@ -35,3 +35,6 @@ the PCIe specification.
NOTE: this only applies to the SMMU itself, not
masters connected upstream of the SMMU.
- hisilicon,broken-prefetch-cmd
: Avoid sending CMD_PREFETCH_* commands to the SMMU.

32
drivers/iommu/arm-smmu-v3.c
View File

@ -543,6 +543,9 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_HYP (1 << 12)
u32 features;
#define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0)
u32 options;
struct arm_smmu_cmdq cmdq;
struct arm_smmu_evtq evtq;
struct arm_smmu_priq priq;
@ -603,11 +606,35 @@ struct arm_smmu_domain {
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
struct arm_smmu_option_prop {
u32 opt;
const char *prop;
};
static struct arm_smmu_option_prop arm_smmu_options[] = {
{ ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
{ 0, NULL},
};
static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
{
return container_of(dom, struct arm_smmu_domain, domain);
}
static void parse_driver_options(struct arm_smmu_device *smmu)
{
int i = 0;
do {
if (of_property_read_bool(smmu->dev->of_node,
arm_smmu_options[i].prop)) {
smmu->options |= arm_smmu_options[i].opt;
dev_notice(smmu->dev, "option %s\n",
arm_smmu_options[i].prop);
}
} while (arm_smmu_options[++i].opt);
}
/* Low-level queue manipulation functions */
static bool queue_full(struct arm_smmu_queue *q)
{
@ -1037,7 +1064,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
arm_smmu_sync_ste_for_sid(smmu, sid);
/* It's likely that we'll want to use the new STE soon */
arm_smmu_cmdq_issue_cmd(smmu, &prefetch_cmd);
if (!(smmu->options & ARM_SMMU_OPT_SKIP_PREFETCH))
arm_smmu_cmdq_issue_cmd(smmu, &prefetch_cmd);
}
static void arm_smmu_init_bypass_stes(u64 *strtab, unsigned int nent)
@ -2575,6 +2603,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
if (irq > 0)
smmu->gerr_irq = irq;
parse_driver_options(smmu);
/* Probe the h/w */
ret = arm_smmu_device_probe(smmu);
if (ret)