On Fri, Oct 25, 2019 at 07:08:37PM +0100, Robin Murphy wrote:
> TTBR1 values have so far been redundant since no users implement any
> support for split address spaces. Crucially, though, one of the main
> reasons for wanting to do so is to be able to manage each half entirely
> independently, e.g. context-switching one set of mappings without
> disturbing the other. Thus it seems unlikely that tying two tables
> together in a single io_pgtable_cfg would ever be particularly desirable
> or useful.
>
> Streamline the configs to just a single conceptual TTBR value
> representing the allocated table. This paves the way for future users to
> support split address spaces by simply allocating a table and dealing
> with the detailed TTBRn logistics themselves.
Tested-by: Jordan Crouse <jcro...@codeaurora.org>
> Signed-off-by: Robin Murphy <robin.mur...@arm.com>
> ---
> drivers/iommu/arm-smmu-v3.c | 2 +-
> drivers/iommu/arm-smmu.c | 9 ++++-----
> drivers/iommu/io-pgtable-arm-v7s.c | 16 +++++++---------
> drivers/iommu/io-pgtable-arm.c | 5 ++---
> drivers/iommu/ipmmu-vmsa.c | 2 +-
> drivers/iommu/msm_iommu.c | 4 ++--
> drivers/iommu/mtk_iommu.c | 4 ++--
> drivers/iommu/qcom_iommu.c | 3 +--
> include/linux/io-pgtable.h | 4 ++--
> 9 files changed, 22 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 3f20e548f1ec..da31e607698f 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2170,7 +2170,7 @@ static int arm_smmu_domain_finalise_s1(struct
> arm_smmu_domain *smmu_domain,
> }
>
> cfg->cd.asid = (u16)asid;
> - cfg->cd.ttbr = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
> + cfg->cd.ttbr = pgtbl_cfg->arm_lpae_s1_cfg.ttbr;
> cfg->cd.tcr = pgtbl_cfg->arm_lpae_s1_cfg.tcr;
> cfg->cd.mair = pgtbl_cfg->arm_lpae_s1_cfg.mair;
> return 0;
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 2bc3e93b11e6..a249e4e49ead 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -534,13 +534,12 @@ static void arm_smmu_init_context_bank(struct
> arm_smmu_domain *smmu_domain,
> /* TTBRs */
> if (stage1) {
> if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_S) {
> - cb->ttbr[0] = pgtbl_cfg->arm_v7s_cfg.ttbr[0];
> - cb->ttbr[1] = pgtbl_cfg->arm_v7s_cfg.ttbr[1];
> + cb->ttbr[0] = pgtbl_cfg->arm_v7s_cfg.ttbr;
> + cb->ttbr[1] = 0;
> } else {
> - cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
> + cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr;
> cb->ttbr[0] |= FIELD_PREP(TTBRn_ASID, cfg->asid);
> - cb->ttbr[1] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1];
> - cb->ttbr[1] |= FIELD_PREP(TTBRn_ASID, cfg->asid);
> + cb->ttbr[1] = FIELD_PREP(TTBRn_ASID, cfg->asid);
> }
> } else {
> cb->ttbr[0] = pgtbl_cfg->arm_lpae_s2_cfg.vttbr;
> diff --git a/drivers/iommu/io-pgtable-arm-v7s.c
> b/drivers/iommu/io-pgtable-arm-v7s.c
> index 7c3bd2c3cdca..4d2c1e7f67c4 100644
> --- a/drivers/iommu/io-pgtable-arm-v7s.c
> +++ b/drivers/iommu/io-pgtable-arm-v7s.c
> @@ -822,15 +822,13 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct
> io_pgtable_cfg *cfg,
> /* Ensure the empty pgd is visible before any actual TTBR write */
> wmb();
>
> - /* TTBRs */
> - cfg->arm_v7s_cfg.ttbr[0] = virt_to_phys(data->pgd) |
> - ARM_V7S_TTBR_S | ARM_V7S_TTBR_NOS |
> - (cfg->coherent_walk ?
> - (ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
> - ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) :
> - (ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) |
> - ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC)));
> - cfg->arm_v7s_cfg.ttbr[1] = 0;
> + /* TTBR */
> + cfg->arm_v7s_cfg.ttbr = virt_to_phys(data->pgd) | ARM_V7S_TTBR_S |
> + (cfg->coherent_walk ? (ARM_V7S_TTBR_NOS |
> + ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
> + ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) :
> + (ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) |
> + ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC)));
> return &data->iop;
>
> out_free_data:
> diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
> index 1795df8f7a51..bc0841040ebe 100644
> --- a/drivers/iommu/io-pgtable-arm.c
> +++ b/drivers/iommu/io-pgtable-arm.c
> @@ -872,9 +872,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg,
> void *cookie)
> /* Ensure the empty pgd is visible before any actual TTBR write */
> wmb();
>
> - /* TTBRs */
> - cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
> - cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
> + /* TTBR */
> + cfg->arm_lpae_s1_cfg.ttbr = virt_to_phys(data->pgd);
> return &data->iop;
>
> out_free_data:
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index e4da6efbda49..4fe0ff3216ce 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -416,7 +416,7 @@ static void ipmmu_domain_setup_context(struct
> ipmmu_vmsa_domain *domain)
> u32 tmp;
>
> /* TTBR0 */
> - ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr[0];
> + ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr;
> ipmmu_ctx_write_root(domain, IMTTLBR0, ttbr);
> ipmmu_ctx_write_root(domain, IMTTUBR0, ttbr >> 32);
>
> diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
> index be99d408cf35..9ceec140fa67 100644
> --- a/drivers/iommu/msm_iommu.c
> +++ b/drivers/iommu/msm_iommu.c
> @@ -279,8 +279,8 @@ static void __program_context(void __iomem *base, int ctx,
> SET_V2PCFG(base, ctx, 0x3);
>
> SET_TTBCR(base, ctx, priv->cfg.arm_v7s_cfg.tcr);
> - SET_TTBR0(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[0]);
> - SET_TTBR1(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[1]);
> + SET_TTBR0(base, ctx, priv->cfg.arm_v7s_cfg.ttbr);
> + SET_TTBR1(base, ctx, 0);
>
> /* Set prrr and nmrr */
> SET_PRRR(base, ctx, priv->cfg.arm_v7s_cfg.prrr);
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 67a483c1a935..ef0b36eeb83d 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -392,7 +392,7 @@ static int mtk_iommu_attach_device(struct iommu_domain
> *domain,
> /* Update the pgtable base address register of the M4U HW */
> if (!data->m4u_dom) {
> data->m4u_dom = dom;
> - writel(dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
> + writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
> data->base + REG_MMU_PT_BASE_ADDR);
> }
>
> @@ -797,7 +797,7 @@ static int __maybe_unused mtk_iommu_resume(struct device
> *dev)
> writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
> writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG);
> if (m4u_dom)
> - writel(m4u_dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
> + writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
> base + REG_MMU_PT_BASE_ADDR);
> return 0;
> }
> diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
> index 66e9b40e9275..9a57eb6c253c 100644
> --- a/drivers/iommu/qcom_iommu.c
> +++ b/drivers/iommu/qcom_iommu.c
> @@ -269,10 +269,9 @@ static int qcom_iommu_init_domain(struct iommu_domain
> *domain,
>
> /* TTBRs */
> iommu_writeq(ctx, ARM_SMMU_CB_TTBR0,
> - pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0] |
> + pgtbl_cfg.arm_lpae_s1_cfg.ttbr |
> FIELD_PREP(TTBRn_ASID, ctx->asid));
> iommu_writeq(ctx, ARM_SMMU_CB_TTBR1,
> - pgtbl_cfg.arm_lpae_s1_cfg.ttbr[1] |
> FIELD_PREP(TTBRn_ASID, ctx->asid));
>
> /* TCR */
> diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
> index ee21eedafe98..53bca5343f52 100644
> --- a/include/linux/io-pgtable.h
> +++ b/include/linux/io-pgtable.h
> @@ -100,7 +100,7 @@ struct io_pgtable_cfg {
> /* Low-level data specific to the table format */
> union {
> struct {
> - u64 ttbr[2];
> + u64 ttbr;
> u64 tcr;
> u64 mair;
> } arm_lpae_s1_cfg;
> @@ -111,7 +111,7 @@ struct io_pgtable_cfg {
> } arm_lpae_s2_cfg;
>
> struct {
> - u32 ttbr[2];
> + u32 ttbr;
> u32 tcr;
> u32 nmrr;
> u32 prrr;
> --
> 2.21.0.dirty
>
--
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a Linux Foundation Collaborative Project
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