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SubjectRe: [PATCH 2/2] Revert "iommu/arm-smmu-v3: Don't reserve implementation defined register space"
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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.

Robin.

> Signed-off-by: Zhen Lei <thunder.leizhen@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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