On 2021/1/20 23:02, Robin Murphy wrote:
> On 2021-01-19 01:59, Zhen Lei wrote:
>> This reverts commit 52f3fab0067d6fa9e99c1b7f63265dd48ca76046.
>>
>> This problem has been fixed by another patch. The original method had side
>> effects, it was not mapped to the user-specified resource size. The code
>> will become more complex when ECMDQ is supported later.
>
> FWIW I don't think that's a significant issue either way - there could be any
> number of imp-def pages between SMMU page 0 and the ECMDQ control pages, so
> it will still be logical to map them as another separate thing anyway.
Yes, so now I'm thinking of preserving the SMMUv3 resources and eliminating the
imp-def area. Then use another devm_ioremap() to cover the entire
resource，assign it to smmu->base.
Otherwise, a base pointer needs to be defined for each separated register
space，or call a function to convert each time.
>
> Robin.
>
>> Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com>
>> ---
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 32
>> ++++-------------------------
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 3 ---
>> 2 files changed, 4 insertions(+), 31 deletions(-)
>>
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> index 8ca7415d785d9bf..477f473842e5272 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> @@ -91,8 +91,9 @@ struct arm_smmu_option_prop {
>> static inline void __iomem *arm_smmu_page1_fixup(unsigned long offset,
>> struct arm_smmu_device *smmu)
>> {
>> - if (offset > SZ_64K)
>> - return smmu->page1 + offset - SZ_64K;
>> + if ((offset > SZ_64K) &&
>> + (smmu->options & ARM_SMMU_OPT_PAGE0_REGS_ONLY))
>> + offset -= SZ_64K;
>> return smmu->base + offset;
>> }
>> @@ -3486,18 +3487,6 @@ static int arm_smmu_set_bus_ops(struct iommu_ops *ops)
>> return err;
>> }
>> -static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t
>> start,
>> - resource_size_t size)
>> -{
>> - struct resource res = {
>> - .flags = IORESOURCE_MEM,
>> - .start = start,
>> - .end = start + size - 1,
>> - };
>> -
>> - return devm_ioremap_resource(dev, &res);
>> -}
>> -
>> static int arm_smmu_device_probe(struct platform_device *pdev)
>> {
>> int irq, ret;
>> @@ -3533,23 +3522,10 @@ static int arm_smmu_device_probe(struct
>> platform_device *pdev)
>> }
>> ioaddr = res->start;
>> - /*
>> - * Don't map the IMPLEMENTATION DEFINED regions, since they may contain
>> - * the PMCG registers which are reserved by the PMU driver.
>> - */
>> - smmu->base = arm_smmu_ioremap(dev, ioaddr, ARM_SMMU_REG_SZ);
>> + smmu->base = devm_ioremap_resource(dev, res);
>> if (IS_ERR(smmu->base))
>> return PTR_ERR(smmu->base);
>> - if (arm_smmu_resource_size(smmu) > SZ_64K) {
>> - smmu->page1 = arm_smmu_ioremap(dev, ioaddr + SZ_64K,
>> - ARM_SMMU_REG_SZ);
>> - if (IS_ERR(smmu->page1))
>> - return PTR_ERR(smmu->page1);
>> - } else {
>> - smmu->page1 = smmu->base;
>> - }
>> -
>> /* Interrupt lines */
>> irq = platform_get_irq_byname_optional(pdev, "combined");
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> index 96c2e9565e00282..0c3090c60840c22 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> @@ -152,8 +152,6 @@
>> #define ARM_SMMU_PRIQ_IRQ_CFG1 0xd8
>> #define ARM_SMMU_PRIQ_IRQ_CFG2 0xdc
>> -#define ARM_SMMU_REG_SZ 0xe00
>> -
>> /* Common MSI config fields */
>> #define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2)
>> #define MSI_CFG2_SH GENMASK(5, 4)
>> @@ -584,7 +582,6 @@ struct arm_smmu_strtab_cfg {
>> struct arm_smmu_device {
>> struct device *dev;
>> void __iomem *base;
>> - void __iomem *page1;
>> #define ARM_SMMU_FEAT_2_LVL_STRTAB (1 << 0)
>> #define ARM_SMMU_FEAT_2_LVL_CDTAB (1 << 1)
>>
>
> .
>
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