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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/iommu/io-pgtable-arm.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/iommu/io-pgtable-arm.c')
-rw-r--r--drivers/iommu/io-pgtable-arm.c1310
1 files changed, 1310 insertions, 0 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
new file mode 100644
index 000000000..0ba817e86
--- /dev/null
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -0,0 +1,1310 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * CPU-agnostic ARM page table allocator.
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
+
+#include <linux/atomic.h>
+#include <linux/bitops.h>
+#include <linux/io-pgtable.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/barrier.h>
+
+#include "io-pgtable-arm.h"
+
+#define ARM_LPAE_MAX_ADDR_BITS 52
+#define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
+#define ARM_LPAE_MAX_LEVELS 4
+
+/* Struct accessors */
+#define io_pgtable_to_data(x) \
+ container_of((x), struct arm_lpae_io_pgtable, iop)
+
+#define io_pgtable_ops_to_data(x) \
+ io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
+
+/*
+ * Calculate the right shift amount to get to the portion describing level l
+ * in a virtual address mapped by the pagetable in d.
+ */
+#define ARM_LPAE_LVL_SHIFT(l,d) \
+ (((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level) + \
+ ilog2(sizeof(arm_lpae_iopte)))
+
+#define ARM_LPAE_GRANULE(d) \
+ (sizeof(arm_lpae_iopte) << (d)->bits_per_level)
+#define ARM_LPAE_PGD_SIZE(d) \
+ (sizeof(arm_lpae_iopte) << (d)->pgd_bits)
+
+#define ARM_LPAE_PTES_PER_TABLE(d) \
+ (ARM_LPAE_GRANULE(d) >> ilog2(sizeof(arm_lpae_iopte)))
+
+/*
+ * Calculate the index at level l used to map virtual address a using the
+ * pagetable in d.
+ */
+#define ARM_LPAE_PGD_IDX(l,d) \
+ ((l) == (d)->start_level ? (d)->pgd_bits - (d)->bits_per_level : 0)
+
+#define ARM_LPAE_LVL_IDX(a,l,d) \
+ (((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
+ ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
+
+/* Calculate the block/page mapping size at level l for pagetable in d. */
+#define ARM_LPAE_BLOCK_SIZE(l,d) (1ULL << ARM_LPAE_LVL_SHIFT(l,d))
+
+/* Page table bits */
+#define ARM_LPAE_PTE_TYPE_SHIFT 0
+#define ARM_LPAE_PTE_TYPE_MASK 0x3
+
+#define ARM_LPAE_PTE_TYPE_BLOCK 1
+#define ARM_LPAE_PTE_TYPE_TABLE 3
+#define ARM_LPAE_PTE_TYPE_PAGE 3
+
+#define ARM_LPAE_PTE_ADDR_MASK GENMASK_ULL(47,12)
+
+#define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
+#define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53)
+#define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10)
+#define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8)
+#define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 8)
+#define ARM_LPAE_PTE_SH_IS (((arm_lpae_iopte)3) << 8)
+#define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5)
+#define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0)
+
+#define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2)
+/* Ignore the contiguous bit for block splitting */
+#define ARM_LPAE_PTE_ATTR_HI_MASK (((arm_lpae_iopte)6) << 52)
+#define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \
+ ARM_LPAE_PTE_ATTR_HI_MASK)
+/* Software bit for solving coherency races */
+#define ARM_LPAE_PTE_SW_SYNC (((arm_lpae_iopte)1) << 55)
+
+/* Stage-1 PTE */
+#define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6)
+#define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)2) << 6)
+#define ARM_LPAE_PTE_ATTRINDX_SHIFT 2
+#define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11)
+
+/* Stage-2 PTE */
+#define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6)
+#define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6)
+#define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6)
+#define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2)
+#define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2)
+#define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2)
+
+/* Register bits */
+#define ARM_LPAE_VTCR_SL0_MASK 0x3
+
+#define ARM_LPAE_TCR_T0SZ_SHIFT 0
+
+#define ARM_LPAE_VTCR_PS_SHIFT 16
+#define ARM_LPAE_VTCR_PS_MASK 0x7
+
+#define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3)
+#define ARM_LPAE_MAIR_ATTR_MASK 0xff
+#define ARM_LPAE_MAIR_ATTR_DEVICE 0x04
+#define ARM_LPAE_MAIR_ATTR_NC 0x44
+#define ARM_LPAE_MAIR_ATTR_INC_OWBRWA 0xf4
+#define ARM_LPAE_MAIR_ATTR_WBRWA 0xff
+#define ARM_LPAE_MAIR_ATTR_IDX_NC 0
+#define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1
+#define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
+#define ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE 3
+
+#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)
+
+#define ARM_MALI_LPAE_MEMATTR_IMP_DEF 0x88ULL
+#define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
+
+/* IOPTE accessors */
+#define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
+
+#define iopte_type(pte) \
+ (((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
+
+#define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
+
+struct arm_lpae_io_pgtable {
+ struct io_pgtable iop;
+
+ int pgd_bits;
+ int start_level;
+ int bits_per_level;
+
+ void *pgd;
+};
+
+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) == ARM_LPAE_PTE_TYPE_PAGE;
+
+ return iopte_type(pte) == ARM_LPAE_PTE_TYPE_BLOCK;
+}
+
+static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
+ struct arm_lpae_io_pgtable *data)
+{
+ arm_lpae_iopte pte = paddr;
+
+ /* Of the bits which overlap, either 51:48 or 15:12 are always RES0 */
+ return (pte | (pte >> (48 - 12))) & ARM_LPAE_PTE_ADDR_MASK;
+}
+
+static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
+ struct arm_lpae_io_pgtable *data)
+{
+ u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
+
+ if (ARM_LPAE_GRANULE(data) < SZ_64K)
+ return paddr;
+
+ /* Rotate the packed high-order bits back to the top */
+ return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4);
+}
+
+static bool selftest_running = false;
+
+static dma_addr_t __arm_lpae_dma_addr(void *pages)
+{
+ return (dma_addr_t)virt_to_phys(pages);
+}
+
+static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
+ struct io_pgtable_cfg *cfg)
+{
+ struct device *dev = cfg->iommu_dev;
+ int order = get_order(size);
+ struct page *p;
+ dma_addr_t dma;
+ void *pages;
+
+ VM_BUG_ON((gfp & __GFP_HIGHMEM));
+ p = alloc_pages_node(dev_to_node(dev), gfp | __GFP_ZERO, order);
+ if (!p)
+ return NULL;
+
+ pages = page_address(p);
+ if (!cfg->coherent_walk) {
+ dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma))
+ goto out_free;
+ /*
+ * We depend on the IOMMU being able to work with any physical
+ * address directly, so if the DMA layer suggests otherwise by
+ * translating or truncating them, that bodes very badly...
+ */
+ if (dma != virt_to_phys(pages))
+ goto out_unmap;
+ }
+
+ return pages;
+
+out_unmap:
+ dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
+ dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
+out_free:
+ __free_pages(p, order);
+ return NULL;
+}
+
+static void __arm_lpae_free_pages(void *pages, size_t size,
+ struct io_pgtable_cfg *cfg)
+{
+ if (!cfg->coherent_walk)
+ dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
+ size, DMA_TO_DEVICE);
+ free_pages((unsigned long)pages, get_order(size));
+}
+
+static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, int num_entries,
+ struct io_pgtable_cfg *cfg)
+{
+ dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
+ sizeof(*ptep) * num_entries, DMA_TO_DEVICE);
+}
+
+static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg)
+{
+
+ *ptep = 0;
+
+ if (!cfg->coherent_walk)
+ __arm_lpae_sync_pte(ptep, 1, cfg);
+}
+
+static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
+ struct iommu_iotlb_gather *gather,
+ unsigned long iova, size_t size, size_t pgcount,
+ int lvl, arm_lpae_iopte *ptep);
+
+static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
+ phys_addr_t paddr, arm_lpae_iopte prot,
+ int lvl, int num_entries, arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte pte = prot;
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
+ int i;
+
+ 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;
+
+ for (i = 0; i < num_entries; i++)
+ ptep[i] = pte | paddr_to_iopte(paddr + i * sz, data);
+
+ if (!cfg->coherent_walk)
+ __arm_lpae_sync_pte(ptep, num_entries, cfg);
+}
+
+static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
+ unsigned long iova, phys_addr_t paddr,
+ arm_lpae_iopte prot, int lvl, int num_entries,
+ arm_lpae_iopte *ptep)
+{
+ int i;
+
+ for (i = 0; i < num_entries; i++)
+ if (iopte_leaf(ptep[i], lvl, data->iop.fmt)) {
+ /* We require an unmap first */
+ WARN_ON(!selftest_running);
+ return -EEXIST;
+ } else if (iopte_type(ptep[i]) == ARM_LPAE_PTE_TYPE_TABLE) {
+ /*
+ * We need to unmap and free the old table before
+ * overwriting it with a block entry.
+ */
+ arm_lpae_iopte *tblp;
+ size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
+
+ tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
+ if (__arm_lpae_unmap(data, NULL, iova + i * sz, sz, 1,
+ lvl, tblp) != sz) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+ }
+
+ __arm_lpae_init_pte(data, paddr, prot, lvl, num_entries, ptep);
+ return 0;
+}
+
+static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
+ arm_lpae_iopte *ptep,
+ arm_lpae_iopte curr,
+ struct arm_lpae_io_pgtable *data)
+{
+ arm_lpae_iopte old, new;
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+
+ new = paddr_to_iopte(__pa(table), data) | ARM_LPAE_PTE_TYPE_TABLE;
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
+ new |= ARM_LPAE_PTE_NSTABLE;
+
+ /*
+ * Ensure the table itself is visible before its PTE can be.
+ * Whilst we could get away with cmpxchg64_release below, this
+ * doesn't have any ordering semantics when !CONFIG_SMP.
+ */
+ dma_wmb();
+
+ old = cmpxchg64_relaxed(ptep, curr, new);
+
+ if (cfg->coherent_walk || (old & ARM_LPAE_PTE_SW_SYNC))
+ return old;
+
+ /* Even if it's not ours, there's no point waiting; just kick it */
+ __arm_lpae_sync_pte(ptep, 1, cfg);
+ if (old == curr)
+ WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
+
+ return old;
+}
+
+static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
+ phys_addr_t paddr, size_t size, size_t pgcount,
+ arm_lpae_iopte prot, int lvl, arm_lpae_iopte *ptep,
+ gfp_t gfp, size_t *mapped)
+{
+ arm_lpae_iopte *cptep, pte;
+ size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
+ size_t tblsz = ARM_LPAE_GRANULE(data);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ int ret = 0, num_entries, max_entries, map_idx_start;
+
+ /* Find our entry at the current level */
+ map_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
+ ptep += map_idx_start;
+
+ /* If we can install a leaf entry at this level, then do so */
+ if (size == block_size) {
+ max_entries = ARM_LPAE_PTES_PER_TABLE(data) - map_idx_start;
+ num_entries = min_t(int, pgcount, max_entries);
+ ret = arm_lpae_init_pte(data, iova, paddr, prot, lvl, num_entries, ptep);
+ if (!ret && mapped)
+ *mapped += num_entries * size;
+
+ return ret;
+ }
+
+ /* We can't allocate tables at the final level */
+ if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
+ return -EINVAL;
+
+ /* Grab a pointer to the next level */
+ pte = READ_ONCE(*ptep);
+ if (!pte) {
+ cptep = __arm_lpae_alloc_pages(tblsz, gfp, cfg);
+ if (!cptep)
+ return -ENOMEM;
+
+ pte = arm_lpae_install_table(cptep, ptep, 0, data);
+ if (pte)
+ __arm_lpae_free_pages(cptep, tblsz, cfg);
+ } else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
+ __arm_lpae_sync_pte(ptep, 1, cfg);
+ }
+
+ if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) {
+ cptep = iopte_deref(pte, data);
+ } else if (pte) {
+ /* We require an unmap first */
+ WARN_ON(!selftest_running);
+ return -EEXIST;
+ }
+
+ /* Rinse, repeat */
+ return __arm_lpae_map(data, iova, paddr, size, pgcount, prot, lvl + 1,
+ cptep, gfp, mapped);
+}
+
+static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
+ int prot)
+{
+ arm_lpae_iopte pte;
+
+ 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;
+ } 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);
+ }
+
+ /*
+ * Also Mali has its own notions of shareability wherein its Inner
+ * domain covers the cores within the GPU, and its Outer domain is
+ * "outside the GPU" (i.e. either the Inner or System domain in CPU
+ * terms, depending on coherency).
+ */
+ if (prot & IOMMU_CACHE && data->iop.fmt != ARM_MALI_LPAE)
+ pte |= ARM_LPAE_PTE_SH_IS;
+ else
+ pte |= ARM_LPAE_PTE_SH_OS;
+
+ if (prot & IOMMU_NOEXEC)
+ pte |= ARM_LPAE_PTE_XN;
+
+ if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
+ pte |= ARM_LPAE_PTE_NS;
+
+ if (data->iop.fmt != ARM_MALI_LPAE)
+ pte |= ARM_LPAE_PTE_AF;
+
+ return pte;
+}
+
+static int arm_lpae_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
+ phys_addr_t paddr, size_t pgsize, size_t pgcount,
+ int iommu_prot, gfp_t gfp, size_t *mapped)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ arm_lpae_iopte *ptep = data->pgd;
+ int ret, lvl = data->start_level;
+ arm_lpae_iopte prot;
+ long iaext = (s64)iova >> cfg->ias;
+
+ if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize))
+ return -EINVAL;
+
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
+ iaext = ~iaext;
+ if (WARN_ON(iaext || paddr >> cfg->oas))
+ return -ERANGE;
+
+ /* If no access, then nothing to do */
+ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
+ return 0;
+
+ prot = arm_lpae_prot_to_pte(data, iommu_prot);
+ ret = __arm_lpae_map(data, iova, paddr, pgsize, pgcount, prot, lvl,
+ ptep, gfp, mapped);
+ /*
+ * Synchronise all PTE updates for the new mapping before there's
+ * a chance for anything to kick off a table walk for the new iova.
+ */
+ wmb();
+
+ return ret;
+}
+
+static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
+ phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
+{
+ return arm_lpae_map_pages(ops, iova, paddr, size, 1, iommu_prot, gfp,
+ NULL);
+}
+
+static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
+ arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte *start, *end;
+ unsigned long table_size;
+
+ if (lvl == data->start_level)
+ table_size = ARM_LPAE_PGD_SIZE(data);
+ else
+ table_size = ARM_LPAE_GRANULE(data);
+
+ start = ptep;
+
+ /* Only leaf entries at the last level */
+ if (lvl == ARM_LPAE_MAX_LEVELS - 1)
+ end = ptep;
+ else
+ end = (void *)ptep + table_size;
+
+ while (ptep != end) {
+ arm_lpae_iopte pte = *ptep++;
+
+ if (!pte || iopte_leaf(pte, lvl, data->iop.fmt))
+ continue;
+
+ __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
+ }
+
+ __arm_lpae_free_pages(start, table_size, &data->iop.cfg);
+}
+
+static void arm_lpae_free_pgtable(struct io_pgtable *iop)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
+
+ __arm_lpae_free_pgtable(data, data->start_level, data->pgd);
+ kfree(data);
+}
+
+static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
+ struct iommu_iotlb_gather *gather,
+ unsigned long iova, size_t size,
+ arm_lpae_iopte blk_pte, int lvl,
+ arm_lpae_iopte *ptep, size_t pgcount)
+{
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ arm_lpae_iopte pte, *tablep;
+ phys_addr_t blk_paddr;
+ size_t tablesz = ARM_LPAE_GRANULE(data);
+ size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
+ int ptes_per_table = ARM_LPAE_PTES_PER_TABLE(data);
+ int i, unmap_idx_start = -1, num_entries = 0, max_entries;
+
+ if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
+ return 0;
+
+ tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
+ if (!tablep)
+ return 0; /* Bytes unmapped */
+
+ if (size == split_sz) {
+ unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
+ max_entries = ptes_per_table - unmap_idx_start;
+ num_entries = min_t(int, pgcount, max_entries);
+ }
+
+ blk_paddr = iopte_to_paddr(blk_pte, data);
+ pte = iopte_prot(blk_pte);
+
+ for (i = 0; i < ptes_per_table; i++, blk_paddr += split_sz) {
+ /* Unmap! */
+ if (i >= unmap_idx_start && i < (unmap_idx_start + num_entries))
+ continue;
+
+ __arm_lpae_init_pte(data, blk_paddr, pte, lvl, 1, &tablep[i]);
+ }
+
+ pte = arm_lpae_install_table(tablep, ptep, blk_pte, data);
+ if (pte != blk_pte) {
+ __arm_lpae_free_pages(tablep, tablesz, cfg);
+ /*
+ * We may race against someone unmapping another part of this
+ * block, but anything else is invalid. We can't misinterpret
+ * a page entry here since we're never at the last level.
+ */
+ if (iopte_type(pte) != ARM_LPAE_PTE_TYPE_TABLE)
+ return 0;
+
+ tablep = iopte_deref(pte, data);
+ } else if (unmap_idx_start >= 0) {
+ for (i = 0; i < num_entries; i++)
+ io_pgtable_tlb_add_page(&data->iop, gather, iova + i * size, size);
+
+ return num_entries * size;
+ }
+
+ return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl, tablep);
+}
+
+static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
+ struct iommu_iotlb_gather *gather,
+ unsigned long iova, size_t size, size_t pgcount,
+ int lvl, arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte pte;
+ struct io_pgtable *iop = &data->iop;
+ int i = 0, num_entries, max_entries, unmap_idx_start;
+
+ /* Something went horribly wrong and we ran out of page table */
+ if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
+ return 0;
+
+ unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
+ ptep += unmap_idx_start;
+ pte = READ_ONCE(*ptep);
+ if (WARN_ON(!pte))
+ return 0;
+
+ /* If the size matches this level, we're in the right place */
+ if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
+ max_entries = ARM_LPAE_PTES_PER_TABLE(data) - unmap_idx_start;
+ num_entries = min_t(int, pgcount, max_entries);
+
+ while (i < num_entries) {
+ pte = READ_ONCE(*ptep);
+ if (WARN_ON(!pte))
+ break;
+
+ __arm_lpae_clear_pte(ptep, &iop->cfg);
+
+ if (!iopte_leaf(pte, lvl, iop->fmt)) {
+ /* Also flush any partial walks */
+ io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
+ ARM_LPAE_GRANULE(data));
+ __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
+ } else if (!iommu_iotlb_gather_queued(gather)) {
+ io_pgtable_tlb_add_page(iop, gather, iova + i * size, size);
+ }
+
+ ptep++;
+ i++;
+ }
+
+ return i * size;
+ } 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
+ */
+ return arm_lpae_split_blk_unmap(data, gather, iova, size, pte,
+ lvl + 1, ptep, pgcount);
+ }
+
+ /* Keep on walkin' */
+ ptep = iopte_deref(pte, data);
+ return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl + 1, ptep);
+}
+
+static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
+ size_t pgsize, size_t pgcount,
+ struct iommu_iotlb_gather *gather)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ arm_lpae_iopte *ptep = data->pgd;
+ long iaext = (s64)iova >> cfg->ias;
+
+ if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize || !pgcount))
+ return 0;
+
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
+ iaext = ~iaext;
+ if (WARN_ON(iaext))
+ return 0;
+
+ return __arm_lpae_unmap(data, gather, iova, pgsize, pgcount,
+ data->start_level, ptep);
+}
+
+static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
+ size_t size, struct iommu_iotlb_gather *gather)
+{
+ return arm_lpae_unmap_pages(ops, iova, size, 1, gather);
+}
+
+static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
+ unsigned long iova)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ arm_lpae_iopte pte, *ptep = data->pgd;
+ int lvl = data->start_level;
+
+ do {
+ /* Valid IOPTE pointer? */
+ if (!ptep)
+ return 0;
+
+ /* Grab the IOPTE we're interested in */
+ ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
+ pte = READ_ONCE(*ptep);
+
+ /* Valid entry? */
+ if (!pte)
+ return 0;
+
+ /* Leaf entry? */
+ if (iopte_leaf(pte, lvl, data->iop.fmt))
+ goto found_translation;
+
+ /* Take it to the next level */
+ ptep = iopte_deref(pte, data);
+ } while (++lvl < ARM_LPAE_MAX_LEVELS);
+
+ /* Ran out of page tables to walk */
+ return 0;
+
+found_translation:
+ iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
+ return iopte_to_paddr(pte, data) | iova;
+}
+
+static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
+{
+ unsigned long granule, page_sizes;
+ unsigned int max_addr_bits = 48;
+
+ /*
+ * We need to restrict the supported page sizes to match the
+ * translation regime for a particular granule. Aim to match
+ * the CPU page size if possible, otherwise prefer smaller sizes.
+ * While we're at it, restrict the block sizes to match the
+ * chosen granule.
+ */
+ if (cfg->pgsize_bitmap & PAGE_SIZE)
+ granule = PAGE_SIZE;
+ else if (cfg->pgsize_bitmap & ~PAGE_MASK)
+ granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
+ else if (cfg->pgsize_bitmap & PAGE_MASK)
+ granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
+ else
+ granule = 0;
+
+ switch (granule) {
+ case SZ_4K:
+ page_sizes = (SZ_4K | SZ_2M | SZ_1G);
+ break;
+ case SZ_16K:
+ page_sizes = (SZ_16K | SZ_32M);
+ break;
+ case SZ_64K:
+ max_addr_bits = 52;
+ page_sizes = (SZ_64K | SZ_512M);
+ if (cfg->oas > 48)
+ page_sizes |= 1ULL << 42; /* 4TB */
+ break;
+ default:
+ page_sizes = 0;
+ }
+
+ cfg->pgsize_bitmap &= page_sizes;
+ cfg->ias = min(cfg->ias, max_addr_bits);
+ cfg->oas = min(cfg->oas, max_addr_bits);
+}
+
+static struct arm_lpae_io_pgtable *
+arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
+{
+ struct arm_lpae_io_pgtable *data;
+ int levels, va_bits, pg_shift;
+
+ arm_lpae_restrict_pgsizes(cfg);
+
+ if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
+ return NULL;
+
+ if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
+ return NULL;
+
+ if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
+ return NULL;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ pg_shift = __ffs(cfg->pgsize_bitmap);
+ data->bits_per_level = pg_shift - ilog2(sizeof(arm_lpae_iopte));
+
+ va_bits = cfg->ias - pg_shift;
+ levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
+ data->start_level = ARM_LPAE_MAX_LEVELS - levels;
+
+ /* Calculate the actual size of our pgd (without concatenation) */
+ data->pgd_bits = va_bits - (data->bits_per_level * (levels - 1));
+
+ data->iop.ops = (struct io_pgtable_ops) {
+ .map = arm_lpae_map,
+ .map_pages = arm_lpae_map_pages,
+ .unmap = arm_lpae_unmap,
+ .unmap_pages = arm_lpae_unmap_pages,
+ .iova_to_phys = arm_lpae_iova_to_phys,
+ };
+
+ return data;
+}
+
+static struct io_pgtable *
+arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ u64 reg;
+ struct arm_lpae_io_pgtable *data;
+ typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr;
+ bool tg1;
+
+ if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
+ IO_PGTABLE_QUIRK_ARM_TTBR1 |
+ IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
+ return NULL;
+
+ data = arm_lpae_alloc_pgtable(cfg);
+ if (!data)
+ return NULL;
+
+ /* TCR */
+ if (cfg->coherent_walk) {
+ tcr->sh = ARM_LPAE_TCR_SH_IS;
+ tcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
+ tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA)
+ goto out_free_data;
+ } else {
+ tcr->sh = ARM_LPAE_TCR_SH_OS;
+ tcr->irgn = ARM_LPAE_TCR_RGN_NC;
+ if (!(cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
+ tcr->orgn = ARM_LPAE_TCR_RGN_NC;
+ else
+ tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
+ }
+
+ tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1;
+ switch (ARM_LPAE_GRANULE(data)) {
+ case SZ_4K:
+ tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K;
+ break;
+ case SZ_16K:
+ tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K;
+ break;
+ case SZ_64K:
+ tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K;
+ break;
+ }
+
+ switch (cfg->oas) {
+ case 32:
+ tcr->ips = ARM_LPAE_TCR_PS_32_BIT;
+ break;
+ case 36:
+ tcr->ips = ARM_LPAE_TCR_PS_36_BIT;
+ break;
+ case 40:
+ tcr->ips = ARM_LPAE_TCR_PS_40_BIT;
+ break;
+ case 42:
+ tcr->ips = ARM_LPAE_TCR_PS_42_BIT;
+ break;
+ case 44:
+ tcr->ips = ARM_LPAE_TCR_PS_44_BIT;
+ break;
+ case 48:
+ tcr->ips = ARM_LPAE_TCR_PS_48_BIT;
+ break;
+ case 52:
+ tcr->ips = ARM_LPAE_TCR_PS_52_BIT;
+ break;
+ default:
+ goto out_free_data;
+ }
+
+ tcr->tsz = 64ULL - cfg->ias;
+
+ /* MAIRs */
+ reg = (ARM_LPAE_MAIR_ATTR_NC
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
+ (ARM_LPAE_MAIR_ATTR_WBRWA
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
+ (ARM_LPAE_MAIR_ATTR_DEVICE
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)) |
+ (ARM_LPAE_MAIR_ATTR_INC_OWBRWA
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE));
+
+ cfg->arm_lpae_s1_cfg.mair = reg;
+
+ /* Looking good; allocate a pgd */
+ data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
+ GFP_KERNEL, cfg);
+ if (!data->pgd)
+ goto out_free_data;
+
+ /* Ensure the empty pgd is visible before any actual TTBR write */
+ wmb();
+
+ /* TTBR */
+ cfg->arm_lpae_s1_cfg.ttbr = virt_to_phys(data->pgd);
+ return &data->iop;
+
+out_free_data:
+ kfree(data);
+ return NULL;
+}
+
+static struct io_pgtable *
+arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ u64 sl;
+ struct arm_lpae_io_pgtable *data;
+ typeof(&cfg->arm_lpae_s2_cfg.vtcr) vtcr = &cfg->arm_lpae_s2_cfg.vtcr;
+
+ /* The NS quirk doesn't apply at stage 2 */
+ if (cfg->quirks)
+ return NULL;
+
+ data = arm_lpae_alloc_pgtable(cfg);
+ if (!data)
+ return NULL;
+
+ /*
+ * Concatenate PGDs at level 1 if possible in order to reduce
+ * the depth of the stage-2 walk.
+ */
+ if (data->start_level == 0) {
+ unsigned long pgd_pages;
+
+ pgd_pages = ARM_LPAE_PGD_SIZE(data) / sizeof(arm_lpae_iopte);
+ if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
+ data->pgd_bits += data->bits_per_level;
+ data->start_level++;
+ }
+ }
+
+ /* VTCR */
+ if (cfg->coherent_walk) {
+ vtcr->sh = ARM_LPAE_TCR_SH_IS;
+ vtcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
+ vtcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
+ } else {
+ vtcr->sh = ARM_LPAE_TCR_SH_OS;
+ vtcr->irgn = ARM_LPAE_TCR_RGN_NC;
+ vtcr->orgn = ARM_LPAE_TCR_RGN_NC;
+ }
+
+ sl = data->start_level;
+
+ switch (ARM_LPAE_GRANULE(data)) {
+ case SZ_4K:
+ vtcr->tg = ARM_LPAE_TCR_TG0_4K;
+ sl++; /* SL0 format is different for 4K granule size */
+ break;
+ case SZ_16K:
+ vtcr->tg = ARM_LPAE_TCR_TG0_16K;
+ break;
+ case SZ_64K:
+ vtcr->tg = ARM_LPAE_TCR_TG0_64K;
+ break;
+ }
+
+ switch (cfg->oas) {
+ case 32:
+ vtcr->ps = ARM_LPAE_TCR_PS_32_BIT;
+ break;
+ case 36:
+ vtcr->ps = ARM_LPAE_TCR_PS_36_BIT;
+ break;
+ case 40:
+ vtcr->ps = ARM_LPAE_TCR_PS_40_BIT;
+ break;
+ case 42:
+ vtcr->ps = ARM_LPAE_TCR_PS_42_BIT;
+ break;
+ case 44:
+ vtcr->ps = ARM_LPAE_TCR_PS_44_BIT;
+ break;
+ case 48:
+ vtcr->ps = ARM_LPAE_TCR_PS_48_BIT;
+ break;
+ case 52:
+ vtcr->ps = ARM_LPAE_TCR_PS_52_BIT;
+ break;
+ default:
+ goto out_free_data;
+ }
+
+ vtcr->tsz = 64ULL - cfg->ias;
+ vtcr->sl = ~sl & ARM_LPAE_VTCR_SL0_MASK;
+
+ /* Allocate pgd pages */
+ data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
+ GFP_KERNEL, cfg);
+ if (!data->pgd)
+ goto out_free_data;
+
+ /* Ensure the empty pgd is visible before any actual TTBR write */
+ wmb();
+
+ /* VTTBR */
+ cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
+ return &data->iop;
+
+out_free_data:
+ kfree(data);
+ return NULL;
+}
+
+static struct io_pgtable *
+arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ if (cfg->ias > 32 || cfg->oas > 40)
+ return NULL;
+
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+ return arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
+}
+
+static struct io_pgtable *
+arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ if (cfg->ias > 40 || cfg->oas > 40)
+ return NULL;
+
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+ return arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
+}
+
+static struct io_pgtable *
+arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ struct arm_lpae_io_pgtable *data;
+
+ /* No quirks for Mali (hopefully) */
+ if (cfg->quirks)
+ return NULL;
+
+ if (cfg->ias > 48 || cfg->oas > 40)
+ return NULL;
+
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+
+ data = arm_lpae_alloc_pgtable(cfg);
+ if (!data)
+ return NULL;
+
+ /* Mali seems to need a full 4-level table regardless of IAS */
+ if (data->start_level > 0) {
+ data->start_level = 0;
+ data->pgd_bits = 0;
+ }
+ /*
+ * MEMATTR: Mali has no actual notion of a non-cacheable type, so the
+ * best we can do is mimic the out-of-tree driver and hope that the
+ * "implementation-defined caching policy" is good enough. Similarly,
+ * we'll use it for the sake of a valid attribute for our 'device'
+ * index, although callers should never request that in practice.
+ */
+ cfg->arm_mali_lpae_cfg.memattr =
+ (ARM_MALI_LPAE_MEMATTR_IMP_DEF
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
+ (ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
+ (ARM_MALI_LPAE_MEMATTR_IMP_DEF
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
+
+ data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
+ cfg);
+ if (!data->pgd)
+ goto out_free_data;
+
+ /* Ensure the empty pgd is visible before TRANSTAB can be written */
+ wmb();
+
+ cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
+ ARM_MALI_LPAE_TTBR_READ_INNER |
+ ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
+ if (cfg->coherent_walk)
+ cfg->arm_mali_lpae_cfg.transtab |= ARM_MALI_LPAE_TTBR_SHARE_OUTER;
+
+ return &data->iop;
+
+out_free_data:
+ kfree(data);
+ return NULL;
+}
+
+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,
+};
+
+struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
+ .alloc = arm_64_lpae_alloc_pgtable_s2,
+ .free = arm_lpae_free_pgtable,
+};
+
+struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
+ .alloc = arm_32_lpae_alloc_pgtable_s1,
+ .free = arm_lpae_free_pgtable,
+};
+
+struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
+ .alloc = arm_32_lpae_alloc_pgtable_s2,
+ .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 __initdata;
+
+static void __init dummy_tlb_flush_all(void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+}
+
+static void __init dummy_tlb_flush(unsigned long iova, size_t size,
+ size_t granule, void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+ WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
+}
+
+static void __init dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
+ unsigned long iova, size_t granule,
+ void *cookie)
+{
+ dummy_tlb_flush(iova, granule, granule, cookie);
+}
+
+static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
+ .tlb_flush_all = dummy_tlb_flush_all,
+ .tlb_flush_walk = dummy_tlb_flush,
+ .tlb_add_page = dummy_tlb_add_page,
+};
+
+static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+
+ pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
+ cfg->pgsize_bitmap, cfg->ias);
+ pr_err("data: %d levels, 0x%zx pgd_size, %u pg_shift, %u bits_per_level, pgd @ %p\n",
+ ARM_LPAE_MAX_LEVELS - data->start_level, ARM_LPAE_PGD_SIZE(data),
+ ilog2(ARM_LPAE_GRANULE(data)), data->bits_per_level, data->pgd);
+}
+
+#define __FAIL(ops, i) ({ \
+ WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \
+ arm_lpae_dump_ops(ops); \
+ selftest_running = false; \
+ -EFAULT; \
+})
+
+static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
+{
+ static const enum io_pgtable_fmt fmts[] __initconst = {
+ ARM_64_LPAE_S1,
+ ARM_64_LPAE_S2,
+ };
+
+ int i, j;
+ unsigned long iova;
+ size_t size;
+ struct io_pgtable_ops *ops;
+
+ selftest_running = true;
+
+ for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
+ cfg_cookie = cfg;
+ ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
+ if (!ops) {
+ pr_err("selftest: failed to allocate io pgtable ops\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Initial sanity checks.
+ * Empty page tables shouldn't provide any translations.
+ */
+ if (ops->iova_to_phys(ops, 42))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_1G + 42))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_2G + 42))
+ return __FAIL(ops, i);
+
+ /*
+ * Distinct mappings of different granule sizes.
+ */
+ iova = 0;
+ for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
+ size = 1UL << j;
+
+ if (ops->map(ops, iova, iova, size, IOMMU_READ |
+ IOMMU_WRITE |
+ IOMMU_NOEXEC |
+ IOMMU_CACHE, GFP_KERNEL))
+ return __FAIL(ops, i);
+
+ /* Overlapping mappings */
+ if (!ops->map(ops, iova, iova + size, size,
+ IOMMU_READ | IOMMU_NOEXEC, GFP_KERNEL))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+ return __FAIL(ops, i);
+
+ iova += SZ_1G;
+ }
+
+ /* Partial unmap */
+ size = 1UL << __ffs(cfg->pgsize_bitmap);
+ if (ops->unmap(ops, SZ_1G + size, size, NULL) != size)
+ return __FAIL(ops, i);
+
+ /* Remap of partial unmap */
+ if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ, GFP_KERNEL))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
+ return __FAIL(ops, i);
+
+ /* Full unmap */
+ iova = 0;
+ for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
+ size = 1UL << j;
+
+ if (ops->unmap(ops, iova, size, NULL) != size)
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42))
+ return __FAIL(ops, i);
+
+ /* Remap full block */
+ if (ops->map(ops, iova, iova, size, IOMMU_WRITE, GFP_KERNEL))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+ return __FAIL(ops, i);
+
+ iova += SZ_1G;
+ }
+
+ free_io_pgtable_ops(ops);
+ }
+
+ selftest_running = false;
+ return 0;
+}
+
+static int __init arm_lpae_do_selftests(void)
+{
+ static const unsigned long pgsize[] __initconst = {
+ SZ_4K | SZ_2M | SZ_1G,
+ SZ_16K | SZ_32M,
+ SZ_64K | SZ_512M,
+ };
+
+ static const unsigned int ias[] __initconst = {
+ 32, 36, 40, 42, 44, 48,
+ };
+
+ int i, j, pass = 0, fail = 0;
+ struct device dev;
+ struct io_pgtable_cfg cfg = {
+ .tlb = &dummy_tlb_ops,
+ .oas = 48,
+ .coherent_walk = true,
+ .iommu_dev = &dev,
+ };
+
+ /* __arm_lpae_alloc_pages() merely needs dev_to_node() to work */
+ set_dev_node(&dev, NUMA_NO_NODE);
+
+ for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
+ for (j = 0; j < ARRAY_SIZE(ias); ++j) {
+ cfg.pgsize_bitmap = pgsize[i];
+ cfg.ias = ias[j];
+ pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
+ pgsize[i], ias[j]);
+ if (arm_lpae_run_tests(&cfg))
+ fail++;
+ else
+ pass++;
+ }
+ }
+
+ pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
+ return fail ? -EFAULT : 0;
+}
+subsys_initcall(arm_lpae_do_selftests);
+#endif