Messages in this thread Patch in this message | | | From | Rob Herring <> | Subject | [PATCH v3 1/3] iommu: io-pgtable: Add ARM Mali midgard MMU page table format | Date | Tue, 9 Apr 2019 15:54:25 -0500 |
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ARM Mali midgard GPU is similar to standard 64-bit stage 1 page tables, but have a few differences. Add a new format type to represent the format. The input address size is 48-bits and the output address size is 40-bits (and possibly less?). Note that the later bifrost GPUs follow the standard 64-bit stage 1 format.
The differences in the format compared to 64-bit stage 1 format are:
The 3rd level page entry bits are 0x1 instead of 0x3 for page entries.
The access flags are not read-only and unprivileged, but read and write. This is similar to stage 2 entries, but the memory attributes field matches stage 1 being an index.
The nG bit is not set by the vendor driver. This one didn't seem to matter, but we'll keep it aligned to the vendor driver.
Cc: Will Deacon <will.deacon@arm.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: linux-arm-kernel@lists.infradead.org Cc: iommu@lists.linux-foundation.org Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Signed-off-by: Rob Herring <robh@kernel.org> --- This is really v4 of the patch. v3 is the series version.
Joerg, please ack so we can take this via the drm tree.
v3: - Incorporated refactoring from Robin
drivers/iommu/io-pgtable-arm.c | 91 ++++++++++++++++++++++++++-------- drivers/iommu/io-pgtable.c | 1 + include/linux/io-pgtable.h | 7 +++ 3 files changed, 77 insertions(+), 22 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index d3700ec15cbd..4e21efbc4459 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -172,6 +172,10 @@ #define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1 #define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
+#define ARM_MALI_LPAE_TTBR_ADRMODE_TABLE (3u << 0) +#define ARM_MALI_LPAE_TTBR_READ_INNER BIT(2) +#define ARM_MALI_LPAE_TTBR_SHARE_OUTER BIT(4) + /* IOPTE accessors */ #define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
@@ -180,11 +184,6 @@
#define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
-#define iopte_leaf(pte,l) \ - (l == (ARM_LPAE_MAX_LEVELS - 1) ? \ - (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_PAGE) : \ - (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_BLOCK)) - struct arm_lpae_io_pgtable { struct io_pgtable iop;
@@ -198,6 +197,15 @@ struct arm_lpae_io_pgtable {
typedef u64 arm_lpae_iopte;
+static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl, + enum io_pgtable_fmt fmt) +{ + if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE) + return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_PAGE; + + return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_BLOCK; +} + static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr, struct arm_lpae_io_pgtable *data) { @@ -303,12 +311,14 @@ static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data, if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS) pte |= ARM_LPAE_PTE_NS;
- if (lvl == ARM_LPAE_MAX_LEVELS - 1) + if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1) pte |= ARM_LPAE_PTE_TYPE_PAGE; else pte |= ARM_LPAE_PTE_TYPE_BLOCK;
- pte |= ARM_LPAE_PTE_AF | ARM_LPAE_PTE_SH_IS; + if (data->iop.fmt != ARM_MALI_LPAE) + pte |= ARM_LPAE_PTE_AF; + pte |= ARM_LPAE_PTE_SH_IS; pte |= paddr_to_iopte(paddr, data);
__arm_lpae_set_pte(ptep, pte, &data->iop.cfg); @@ -321,7 +331,7 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data, { arm_lpae_iopte pte = *ptep;
- if (iopte_leaf(pte, lvl)) { + if (iopte_leaf(pte, lvl, data->iop.fmt)) { /* We require an unmap first */ WARN_ON(!selftest_running); return -EEXIST; @@ -409,7 +419,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova, __arm_lpae_sync_pte(ptep, cfg); }
- if (pte && !iopte_leaf(pte, lvl)) { + if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) { cptep = iopte_deref(pte, data); } else if (pte) { /* We require an unmap first */ @@ -429,31 +439,37 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data, if (data->iop.fmt == ARM_64_LPAE_S1 || data->iop.fmt == ARM_32_LPAE_S1) { pte = ARM_LPAE_PTE_nG; - if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ)) pte |= ARM_LPAE_PTE_AP_RDONLY; - if (!(prot & IOMMU_PRIV)) pte |= ARM_LPAE_PTE_AP_UNPRIV; - - if (prot & IOMMU_MMIO) - pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV - << ARM_LPAE_PTE_ATTRINDX_SHIFT); - else if (prot & IOMMU_CACHE) - pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE - << ARM_LPAE_PTE_ATTRINDX_SHIFT); } else { pte = ARM_LPAE_PTE_HAP_FAULT; if (prot & IOMMU_READ) pte |= ARM_LPAE_PTE_HAP_READ; if (prot & IOMMU_WRITE) pte |= ARM_LPAE_PTE_HAP_WRITE; + } + + /* + * Note that this logic is structured to accommodate Mali LPAE + * having stage-1-like attributes but stage-2-like permissions. + */ + if (data->iop.fmt == ARM_64_LPAE_S2 || + data->iop.fmt == ARM_32_LPAE_S2) { if (prot & IOMMU_MMIO) pte |= ARM_LPAE_PTE_MEMATTR_DEV; else if (prot & IOMMU_CACHE) pte |= ARM_LPAE_PTE_MEMATTR_OIWB; else pte |= ARM_LPAE_PTE_MEMATTR_NC; + } else { + if (prot & IOMMU_MMIO) + pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV + << ARM_LPAE_PTE_ATTRINDX_SHIFT); + else if (prot & IOMMU_CACHE) + pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE + << ARM_LPAE_PTE_ATTRINDX_SHIFT); }
if (prot & IOMMU_NOEXEC) @@ -511,7 +527,7 @@ static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl, while (ptep != end) { arm_lpae_iopte pte = *ptep++;
- if (!pte || iopte_leaf(pte, lvl)) + if (!pte || iopte_leaf(pte, lvl, data->iop.fmt)) continue;
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data)); @@ -602,7 +618,7 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) { __arm_lpae_set_pte(ptep, 0, &iop->cfg);
- if (!iopte_leaf(pte, lvl)) { + if (!iopte_leaf(pte, lvl, iop->fmt)) { /* Also flush any partial walks */ io_pgtable_tlb_add_flush(iop, iova, size, ARM_LPAE_GRANULE(data), false); @@ -621,7 +637,7 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, }
return size; - } else if (iopte_leaf(pte, lvl)) { + } else if (iopte_leaf(pte, lvl, iop->fmt)) { /* * Insert a table at the next level to map the old region, * minus the part we want to unmap @@ -669,7 +685,7 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, return 0;
/* Leaf entry? */ - if (iopte_leaf(pte,lvl)) + if (iopte_leaf(pte, lvl, data->iop.fmt)) goto found_translation;
/* Take it to the next level */ @@ -995,6 +1011,32 @@ arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie) return iop; }
+static struct io_pgtable * +arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie) +{ + struct io_pgtable *iop; + + if (cfg->ias != 48 || cfg->oas > 40) + return NULL; + + cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G); + iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie); + if (iop) { + u64 mair, ttbr; + + /* Copy values as union fields overlap */ + mair = cfg->arm_lpae_s1_cfg.mair[0]; + ttbr = cfg->arm_lpae_s1_cfg.ttbr[0]; + + cfg->arm_mali_lpae_cfg.memattr = mair; + cfg->arm_mali_lpae_cfg.transtab = ttbr | + ARM_MALI_LPAE_TTBR_READ_INNER | + ARM_MALI_LPAE_TTBR_ADRMODE_TABLE; + } + + return iop; +} + struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = { .alloc = arm_64_lpae_alloc_pgtable_s1, .free = arm_lpae_free_pgtable, @@ -1015,6 +1057,11 @@ struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = { .free = arm_lpae_free_pgtable, };
+struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = { + .alloc = arm_mali_lpae_alloc_pgtable, + .free = arm_lpae_free_pgtable, +}; + #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
static struct io_pgtable_cfg *cfg_cookie; diff --git a/drivers/iommu/io-pgtable.c b/drivers/iommu/io-pgtable.c index 93f2880be6c6..5227cfdbb65b 100644 --- a/drivers/iommu/io-pgtable.c +++ b/drivers/iommu/io-pgtable.c @@ -30,6 +30,7 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = { [ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns, [ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns, [ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns, + [ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns, #endif #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S [ARM_V7S] = &io_pgtable_arm_v7s_init_fns, diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 47d5ae559329..76969a564831 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -12,6 +12,7 @@ enum io_pgtable_fmt { ARM_64_LPAE_S1, ARM_64_LPAE_S2, ARM_V7S, + ARM_MALI_LPAE, IO_PGTABLE_NUM_FMTS, };
@@ -108,6 +109,11 @@ struct io_pgtable_cfg { u32 nmrr; u32 prrr; } arm_v7s_cfg; + + struct { + u64 transtab; + u64 memattr; + } arm_mali_lpae_cfg; }; };
@@ -209,5 +215,6 @@ extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns; +extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
#endif /* __IO_PGTABLE_H */ -- 2.19.1
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