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authorSven Peter <sven@svenpeter.dev>2022-09-16 11:41:51 +0200
committerJoerg Roedel <jroedel@suse.de>2022-09-26 13:49:40 +0200
commitdc09fe1c5edd9c27a52cb6dc5a7bb4452d45c71c (patch)
tree07a0ab89382e6d199cf9cc71ad944332602aa98c /drivers/iommu
parentd8fe365a4f1c1aa5e2da3e41f50a08c9bd8d6112 (diff)
iommu/io-pgtable-dart: Add DART PTE support for t6000
The DARTs present in the M1 Pro/Max/Ultra SoC use a diffent PTE format. They support a 42bit physical address space by shifting the paddr and extending its mask inside the PTE. They also come with mandatory sub-page protection now which we just configure to always allow access to the entire page. This feature is already present but optional on the previous DARTs which allows to unconditionally configure it. Signed-off-by: Sven Peter <sven@svenpeter.dev> Co-developed-by: Janne Grunau <j@jannau.net> Signed-off-by: Janne Grunau <j@jannau.net> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Hector Martin <marcan@marcan.st> Link: https://lore.kernel.org/r/20220916094152.87137-5-j@jannau.net Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/io-pgtable-dart.c49
-rw-r--r--drivers/iommu/io-pgtable.c1
2 files changed, 43 insertions, 7 deletions
diff --git a/drivers/iommu/io-pgtable-dart.c b/drivers/iommu/io-pgtable-dart.c
index fc76b6168055..74b1ef2b96be 100644
--- a/drivers/iommu/io-pgtable-dart.c
+++ b/drivers/iommu/io-pgtable-dart.c
@@ -45,12 +45,19 @@
#define APPLE_DART_PTE_SUBPAGE_END GENMASK_ULL(51, 40)
#define APPLE_DART1_PADDR_MASK GENMASK_ULL(35, 12)
+#define APPLE_DART2_PADDR_MASK GENMASK_ULL(37, 10)
+#define APPLE_DART2_PADDR_SHIFT (4)
/* Apple DART1 protection bits */
#define APPLE_DART1_PTE_PROT_NO_READ BIT(8)
#define APPLE_DART1_PTE_PROT_NO_WRITE BIT(7)
#define APPLE_DART1_PTE_PROT_SP_DIS BIT(1)
+/* Apple DART2 protection bits */
+#define APPLE_DART2_PTE_PROT_NO_READ BIT(3)
+#define APPLE_DART2_PTE_PROT_NO_WRITE BIT(2)
+#define APPLE_DART2_PTE_PROT_NO_CACHE BIT(1)
+
/* marks PTE as valid */
#define APPLE_DART_PTE_VALID BIT(0)
@@ -72,13 +79,31 @@ typedef u64 dart_iopte;
static dart_iopte paddr_to_iopte(phys_addr_t paddr,
struct dart_io_pgtable *data)
{
- return paddr & APPLE_DART1_PADDR_MASK;
+ dart_iopte pte;
+
+ if (data->iop.fmt == APPLE_DART)
+ return paddr & APPLE_DART1_PADDR_MASK;
+
+ /* format is APPLE_DART2 */
+ pte = paddr >> APPLE_DART2_PADDR_SHIFT;
+ pte &= APPLE_DART2_PADDR_MASK;
+
+ return pte;
}
static phys_addr_t iopte_to_paddr(dart_iopte pte,
struct dart_io_pgtable *data)
{
- return pte & APPLE_DART1_PADDR_MASK;
+ u64 paddr;
+
+ if (data->iop.fmt == APPLE_DART)
+ return pte & APPLE_DART1_PADDR_MASK;
+
+ /* format is APPLE_DART2 */
+ paddr = pte & APPLE_DART2_PADDR_MASK;
+ paddr <<= APPLE_DART2_PADDR_SHIFT;
+
+ return paddr;
}
static void *__dart_alloc_pages(size_t size, gfp_t gfp,
@@ -190,10 +215,20 @@ static dart_iopte dart_prot_to_pte(struct dart_io_pgtable *data,
{
dart_iopte pte = 0;
- if (!(prot & IOMMU_WRITE))
- pte |= APPLE_DART1_PTE_PROT_NO_WRITE;
- if (!(prot & IOMMU_READ))
- pte |= APPLE_DART1_PTE_PROT_NO_READ;
+ if (data->iop.fmt == APPLE_DART) {
+ if (!(prot & IOMMU_WRITE))
+ pte |= APPLE_DART1_PTE_PROT_NO_WRITE;
+ if (!(prot & IOMMU_READ))
+ pte |= APPLE_DART1_PTE_PROT_NO_READ;
+ }
+ if (data->iop.fmt == APPLE_DART2) {
+ if (!(prot & IOMMU_WRITE))
+ pte |= APPLE_DART2_PTE_PROT_NO_WRITE;
+ if (!(prot & IOMMU_READ))
+ pte |= APPLE_DART2_PTE_PROT_NO_READ;
+ if (!(prot & IOMMU_CACHE))
+ pte |= APPLE_DART2_PTE_PROT_NO_CACHE;
+ }
return pte;
}
@@ -368,7 +403,7 @@ apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
if (!cfg->coherent_walk)
return NULL;
- if (cfg->oas > DART1_MAX_ADDR_BITS)
+ if (cfg->oas != 36 && cfg->oas != 42)
return NULL;
if (cfg->ias > cfg->oas)
diff --git a/drivers/iommu/io-pgtable.c b/drivers/iommu/io-pgtable.c
index 16205ea9272c..49f46e1eabf7 100644
--- a/drivers/iommu/io-pgtable.c
+++ b/drivers/iommu/io-pgtable.c
@@ -23,6 +23,7 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
#endif
#ifdef CONFIG_IOMMU_IO_PGTABLE_DART
[APPLE_DART] = &io_pgtable_apple_dart_init_fns,
+ [APPLE_DART2] = &io_pgtable_apple_dart_init_fns,
#endif
#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,