[PATCH v2 2/2] [RFC] ARM: IOMMU: Tegra30: iommu_ops for SMMU driver
Hiroshi DOYU
hdoyu at nvidia.com
Thu Dec 15 08:11:30 EST 2011
Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit). This patch
implements struct iommu_ops for SMMU for the upper IOMMU API.
This H/W module supports multiple virtual address spaces(domain x4),
and manages 2 level H/W translation pagetable.
Signed-off-by: Hiroshi DOYU <hdoyu at nvidia.com>
---
arch/arm/mach-tegra/include/mach/smmu.h | 63 ++
drivers/iommu/Kconfig | 11 +
drivers/iommu/Makefile | 1 +
drivers/iommu/tegra-smmu.c | 1027 +++++++++++++++++++++++++++++++
4 files changed, 1102 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-tegra/include/mach/smmu.h
create mode 100644 drivers/iommu/tegra-smmu.c
diff --git a/arch/arm/mach-tegra/include/mach/smmu.h b/arch/arm/mach-tegra/include/mach/smmu.h
new file mode 100644
index 0000000..3eff2e1
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/smmu.h
@@ -0,0 +1,63 @@
+/*
+ * IOMMU API for SMMU in Tegra30
+ *
+ * Copyright (c) 2010-2011, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MACH_SMMU_H
+#define MACH_SMMU_H
+
+enum smmu_hwgrp {
+ HWGRP_AFI,
+ HWGRP_AVPC,
+ HWGRP_DC,
+ HWGRP_DCB,
+ HWGRP_EPP,
+ HWGRP_G2,
+ HWGRP_HC,
+ HWGRP_HDA,
+ HWGRP_ISP,
+ HWGRP_MPE,
+ HWGRP_NV,
+ HWGRP_NV2,
+ HWGRP_PPCS,
+ HWGRP_SATA,
+ HWGRP_VDE,
+ HWGRP_VI,
+
+ HWGRP_COUNT,
+
+ HWGRP_END = ~0,
+};
+
+#define HWG_AFI (1 << HWGRP_AFI)
+#define HWG_AVPC (1 << HWGRP_AVPC)
+#define HWG_DC (1 << HWGRP_DC)
+#define HWG_DCB (1 << HWGRP_DCB)
+#define HWG_EPP (1 << HWGRP_EPP)
+#define HWG_G2 (1 << HWGRP_G2)
+#define HWG_HC (1 << HWGRP_HC)
+#define HWG_HDA (1 << HWGRP_HDA)
+#define HWG_ISP (1 << HWGRP_ISP)
+#define HWG_MPE (1 << HWGRP_MPE)
+#define HWG_NV (1 << HWGRP_NV)
+#define HWG_NV2 (1 << HWGRP_NV2)
+#define HWG_PPCS (1 << HWGRP_PPCS)
+#define HWG_SATA (1 << HWGRP_SATA)
+#define HWG_VDE (1 << HWGRP_VDE)
+#define HWG_VI (1 << HWGRP_VI)
+
+#endif /* MACH_SMMU_H */
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 348ff75..1df5c82 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -142,4 +142,15 @@ config TEGRA_IOMMU_GART
space through the GART (Graphics Address Relocation Table)
hardware included on Tegra SoCs.
+config TEGRA_IOMMU_SMMU
+ bool "Tegra SMMU IOMMU Support"
+ depends on ARCH_TEGRA_3x_SOC
+ default y
+ select IOMMU_API
+ help
+ Enables support for remapping discontiguous physical memory
+ shared with the operating system into contiguous I/O virtual
+ space through the SMMU (System Memory Management Unit)
+ hardware included on Tegra SoCs.
+
endif # IOMMU_SUPPORT
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index fc5f42a..37648c5 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o
obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
+obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
new file mode 100644
index 0000000..454e2b0
--- /dev/null
+++ b/drivers/iommu/tegra-smmu.c
@@ -0,0 +1,1027 @@
+/*
+ * IOMMU API for SMMU in Tegra30
+ *
+ * Copyright (c) 2010-2011, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define pr_fmt(fmt) "%s(): " fmt, __func__
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <linux/iommu.h>
+#include <linux/io.h>
+
+#include <asm/page.h>
+#include <asm/cacheflush.h>
+
+#include <mach/iomap.h>
+#include <mach/smmu.h>
+
+#define SMMU_CONFIG 0x10
+#define SMMU_CONFIG_DISABLE 0
+#define SMMU_CONFIG_ENABLE 1
+
+#define SMMU_TLB_CONFIG 0x14
+#define SMMU_TLB_CONFIG_STATS__MASK (1 << 31)
+#define SMMU_TLB_CONFIG_STATS__ENABLE (1 << 31)
+#define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE (1 << 29)
+#define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE 0x10
+#define SMMU_TLB_CONFIG_RESET_VAL 0x20000010
+
+#define SMMU_PTC_CONFIG 0x18
+#define SMMU_PTC_CONFIG_STATS__MASK (1 << 31)
+#define SMMU_PTC_CONFIG_STATS__ENABLE (1 << 31)
+#define SMMU_PTC_CONFIG_CACHE__ENABLE (1 << 29)
+#define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN 0x3f
+#define SMMU_PTC_CONFIG_RESET_VAL 0x2000003f
+
+#define SMMU_PTB_ASID 0x1c
+#define SMMU_PTB_ASID_CURRENT_SHIFT 0
+
+#define SMMU_PTB_DATA 0x20
+#define SMMU_PTB_DATA_RESET_VAL 0
+#define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT 29
+#define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT 30
+#define SMMU_PTB_DATA_ASID_READABLE_SHIFT 31
+
+#define SMMU_TLB_FLUSH 0x30
+#define SMMU_TLB_FLUSH_VA_MATCH_ALL 0
+#define SMMU_TLB_FLUSH_VA_MATCH_SECTION 2
+#define SMMU_TLB_FLUSH_VA_MATCH_GROUP 3
+#define SMMU_TLB_FLUSH_ASID_SHIFT 29
+#define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE 0
+#define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE 1
+#define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT 31
+
+#define SMMU_PTC_FLUSH 0x34
+#define SMMU_PTC_FLUSH_TYPE_ALL 0
+#define SMMU_PTC_FLUSH_TYPE_ADR 1
+#define SMMU_PTC_FLUSH_ADR_SHIFT 4
+
+#define SMMU_ASID_SECURITY 0x38
+
+#define SMMU_STATS_TLB_HIT_COUNT 0x1f0
+#define SMMU_STATS_TLB_MISS_COUNT 0x1f4
+#define SMMU_STATS_PTC_HIT_COUNT 0x1f8
+#define SMMU_STATS_PTC_MISS_COUNT 0x1fc
+
+#define SMMU_TRANSLATION_ENABLE_0 0x228
+#define SMMU_TRANSLATION_ENABLE_1 0x22c
+#define SMMU_TRANSLATION_ENABLE_2 0x230
+
+#define SMMU_AFI_ASID 0x238 /* PCIE */
+#define SMMU_AVPC_ASID 0x23c /* AVP */
+#define SMMU_DC_ASID 0x240 /* Display controller */
+#define SMMU_DCB_ASID 0x244 /* Display controller B */
+#define SMMU_EPP_ASID 0x248 /* Encoder pre-processor */
+#define SMMU_G2_ASID 0x24c /* 2D engine */
+#define SMMU_HC_ASID 0x250 /* Host1x */
+#define SMMU_HDA_ASID 0x254 /* High-def audio */
+#define SMMU_ISP_ASID 0x258 /* Image signal processor */
+#define SMMU_MPE_ASID 0x264 /* MPEG encoder */
+#define SMMU_NV_ASID 0x268 /* (3D) */
+#define SMMU_NV2_ASID 0x26c /* (3D) */
+#define SMMU_PPCS_ASID 0x270 /* AHB */
+#define SMMU_SATA_ASID 0x278 /* SATA */
+#define SMMU_VDE_ASID 0x27c /* Video decoder */
+#define SMMU_VI_ASID 0x280 /* Video input */
+
+#define SMMU_PDE_NEXT_SHIFT 28
+
+/* AHB Arbiter Registers */
+#define AHB_XBAR_CTRL 0xe0
+#define AHB_XBAR_CTRL_SMMU_INIT_DONE_DONE 1
+#define AHB_XBAR_CTRL_SMMU_INIT_DONE_SHIFT 17
+
+#define SMMU_NUM_ASIDS 4
+#define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000
+#define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12 /* right shift */
+#define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000
+#define SMMU_TLB_FLUSH_VA_GROUP__SHIFT 12 /* right shift */
+#define SMMU_TLB_FLUSH_VA(iova, which) \
+ ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \
+ SMMU_TLB_FLUSH_VA_##which##__SHIFT) | \
+ SMMU_TLB_FLUSH_VA_MATCH_##which)
+#define SMMU_PTB_ASID_CUR(n) \
+ ((n) << SMMU_PTB_ASID_CURRENT_SHIFT)
+#define SMMU_TLB_FLUSH_ASID_MATCH_disable \
+ (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE << \
+ SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
+#define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE \
+ (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE << \
+ SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
+
+#define SMMU_PAGE_SHIFT 12
+#define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT)
+
+#define SMMU_PDIR_COUNT 1024
+#define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT)
+#define SMMU_PTBL_COUNT 1024
+#define SMMU_PTBL_SIZE (sizeof(unsigned long) * SMMU_PTBL_COUNT)
+#define SMMU_PDIR_SHIFT 12
+#define SMMU_PDE_SHIFT 12
+#define SMMU_PTE_SHIFT 12
+#define SMMU_PFN_MASK 0x000fffff
+
+#define SMMU_ADDR_TO_PFN(addr) ((addr) >> 12)
+#define SMMU_ADDR_TO_PDN(addr) ((addr) >> 22)
+#define SMMU_PDN_TO_ADDR(addr) ((pdn) << 22)
+
+#define _READABLE (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT)
+#define _WRITABLE (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT)
+#define _NONSECURE (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT)
+#define _PDE_NEXT (1 << SMMU_PDE_NEXT_SHIFT)
+#define _MASK_ATTR (_READABLE | _WRITABLE | _NONSECURE)
+
+#define _PDIR_ATTR (_READABLE | _WRITABLE | _NONSECURE)
+
+#define _PDE_ATTR (_READABLE | _WRITABLE | _NONSECURE)
+#define _PDE_ATTR_N (_PDE_ATTR | _PDE_NEXT)
+#define _PDE_VACANT(pdn) (((pdn) << 10) | _PDE_ATTR)
+
+#define _PTE_ATTR (_READABLE | _WRITABLE | _NONSECURE)
+#define _PTE_VACANT(addr) (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR)
+
+#define SMMU_MK_PDIR(page, attr) \
+ ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr))
+#define SMMU_MK_PDE(page, attr) \
+ (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr))
+#define SMMU_EX_PTBL_PAGE(pde) \
+ pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK)
+#define SMMU_PFN_TO_PTE(pfn, attr) (unsigned long)((pfn) | (attr))
+
+#define SMMU_ASID_ENABLE(asid) ((asid) | (1 << 31))
+#define SMMU_ASID_DISABLE 0
+#define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0))
+
+#define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1)
+#define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0)
+#define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1)
+#define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0)
+
+#define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID
+
+static const u32 smmu_hwgrp_asid_reg[] = {
+ HWGRP_INIT(AFI),
+ HWGRP_INIT(AVPC),
+ HWGRP_INIT(DC),
+ HWGRP_INIT(DCB),
+ HWGRP_INIT(EPP),
+ HWGRP_INIT(G2),
+ HWGRP_INIT(HC),
+ HWGRP_INIT(HDA),
+ HWGRP_INIT(ISP),
+ HWGRP_INIT(MPE),
+ HWGRP_INIT(NV),
+ HWGRP_INIT(NV2),
+ HWGRP_INIT(PPCS),
+ HWGRP_INIT(SATA),
+ HWGRP_INIT(VDE),
+ HWGRP_INIT(VI),
+};
+#define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x])
+
+/*
+ * Per client for address space
+ */
+struct smmu_client {
+ struct device *dev;
+ struct list_head list;
+ struct smmu_as *as;
+ u32 hwgrp;
+};
+
+/*
+ * Per address space
+ */
+struct smmu_as {
+ struct smmu_device *smmu; /* back pointer to container */
+ unsigned int asid;
+ struct mutex lock; /* for pagetable */
+ struct page *pdir_page;
+ unsigned long pdir_attr;
+ unsigned long pde_attr;
+ unsigned long pte_attr;
+ unsigned int *pte_count;
+
+ struct list_head client;
+ spinlock_t client_lock; /* for client list */
+};
+
+/*
+ * Per SMMU device - IOMMU device
+ */
+struct smmu_device {
+ void __iomem *regs, *regs_ahbarb;
+ unsigned long iovmm_base; /* remappable base address */
+ unsigned long page_count; /* total remappable size */
+ spinlock_t lock;
+ char *name;
+ struct device *dev;
+ int num_ases;
+ struct smmu_as *as; /* Run-time allocated array */
+ struct page *avp_vector_page; /* dummy page shared by all AS's */
+
+ /*
+ * Register image savers for suspend/resume
+ */
+ unsigned long translation_enable_0;
+ unsigned long translation_enable_1;
+ unsigned long translation_enable_2;
+ unsigned long asid_security;
+};
+
+static struct smmu_device *smmu_handle; /* unique for a system */
+
+/*
+ * SMMU/AHB register accessors
+ */
+static inline u32 smmu_read(struct smmu_device *smmu, size_t offs)
+{
+ return readl(smmu->regs + offs);
+}
+static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
+{
+ writel(val, smmu->regs + offs);
+}
+
+static inline u32 ahb_read(struct smmu_device *smmu, size_t offs)
+{
+ return readl(smmu->regs_ahbarb + offs);
+}
+static inline void ahb_write(struct smmu_device *smmu, u32 val, size_t offs)
+{
+ writel(val, smmu->regs_ahbarb + offs);
+}
+
+#define VA_PAGE_TO_PA(va, page) \
+ (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK))
+
+#define FLUSH_CPU_DCACHE(va, page, size) \
+ do { \
+ unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \
+ __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \
+ outer_flush_range(_pa_, _pa_+(size_t)(size)); \
+ } while (0)
+
+/*
+ * Any interaction between any block on PPSB and a block on APB or AHB
+ * must have these read-back barriers to ensure the APB/AHB bus
+ * transaction is complete before initiating activity on the PPSB
+ * block.
+ */
+#define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG)
+
+#define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data)
+
+static int __smmu_client_set_hwgrp(struct smmu_client *c,
+ unsigned long map, int on)
+{
+ int i;
+ struct smmu_as *as = c->as;
+ u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid);
+ struct smmu_device *smmu = as->smmu;
+
+ WARN_ON(!on && map);
+ if (on && !map)
+ return -EINVAL;
+ if (!on)
+ map = smmu_client_hwgrp(c);
+
+ for_each_set_bit(i, &map, BITS_PER_LONG) {
+ offs = HWGRP_ASID_REG(i);
+ val = smmu_read(smmu, offs);
+ if (on) {
+ if (WARN_ON(val & mask))
+ goto err_hw_busy;
+ val |= mask;
+ } else {
+ WARN_ON((val & mask) == mask);
+ val &= ~mask;
+ }
+ smmu_write(smmu, val, offs);
+ }
+ FLUSH_SMMU_REGS(smmu);
+ c->hwgrp = map;
+ return 0;
+err_hw_busy:
+ for_each_set_bit(i, &map, BITS_PER_LONG) {
+ offs = HWGRP_ASID_REG(i);
+ val = smmu_read(smmu, offs);
+ val &= ~mask;
+ smmu_write(smmu, val, offs);
+ }
+ return -EBUSY;
+}
+
+static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on)
+{
+ u32 val;
+ struct smmu_as *as = c->as;
+ struct smmu_device *smmu = as->smmu;
+
+ spin_lock(&smmu->lock);
+ val = __smmu_client_set_hwgrp(c, map, on);
+ spin_unlock(&smmu->lock);
+ return val;
+}
+
+/*
+ * Flush all TLB entries and all PTC entries
+ * Caller must lock smmu
+ */
+static void smmu_flush_regs(struct smmu_device *smmu, int enable)
+{
+ u32 val;
+
+ smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
+ FLUSH_SMMU_REGS(smmu);
+ val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
+ SMMU_TLB_FLUSH_ASID_MATCH_disable;
+ smmu_write(smmu, val, SMMU_TLB_FLUSH);
+
+ if (enable)
+ smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
+ FLUSH_SMMU_REGS(smmu);
+}
+
+static void smmu_setup_regs(struct smmu_device *smmu)
+{
+ int i;
+ u32 val;
+
+ for (i = 0; i < smmu->num_ases; i++) {
+ struct smmu_as *as = &smmu->as[i];
+ struct smmu_client *c;
+
+ smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
+ val = as->pdir_page ?
+ SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) :
+ SMMU_PTB_DATA_RESET_VAL;
+ smmu_write(smmu, val, SMMU_PTB_DATA);
+
+ list_for_each_entry(c, &as->client, list)
+ __smmu_client_set_hwgrp(c, c->hwgrp, 1);
+ }
+
+ smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0);
+ smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1);
+ smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2);
+ smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY);
+ smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_TLB_CONFIG);
+ smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_PTC_CONFIG);
+
+ smmu_flush_regs(smmu, 1);
+
+ val = ahb_read(smmu, AHB_XBAR_CTRL);
+ val |= AHB_XBAR_CTRL_SMMU_INIT_DONE_DONE <<
+ AHB_XBAR_CTRL_SMMU_INIT_DONE_SHIFT;
+ ahb_write(smmu, val, AHB_XBAR_CTRL);
+}
+
+static void flush_ptc_and_tlb(struct smmu_device *smmu,
+ struct smmu_as *as, dma_addr_t iova,
+ unsigned long *pte, struct page *page, int is_pde)
+{
+ u32 val;
+ unsigned long tlb_flush_va = is_pde
+ ? SMMU_TLB_FLUSH_VA(iova, SECTION)
+ : SMMU_TLB_FLUSH_VA(iova, GROUP);
+
+ val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page);
+ smmu_write(smmu, val, SMMU_PTC_FLUSH);
+ FLUSH_SMMU_REGS(smmu);
+ val = tlb_flush_va |
+ SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
+ (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
+ smmu_write(smmu, val, SMMU_TLB_FLUSH);
+ FLUSH_SMMU_REGS(smmu);
+}
+
+static void free_ptbl(struct smmu_as *as, dma_addr_t iova)
+{
+ unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
+ unsigned long *pdir = (unsigned long *)kmap(as->pdir_page);
+
+ if (pdir[pdn] != _PDE_VACANT(pdn)) {
+ pr_debug("pdn: %lx\n", pdn);
+
+ ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn]));
+ __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn]));
+ pdir[pdn] = _PDE_VACANT(pdn);
+ FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
+ flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
+ as->pdir_page, 1);
+ }
+ kunmap(as->pdir_page);
+}
+
+static void free_pdir(struct smmu_as *as)
+{
+ unsigned addr;
+ int count;
+
+ if (!as->pdir_page)
+ return;
+
+ addr = as->smmu->iovmm_base;
+ count = as->smmu->page_count;
+ while (count-- > 0) {
+ free_ptbl(as, addr);
+ addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT;
+ }
+ ClearPageReserved(as->pdir_page);
+ __free_page(as->pdir_page);
+ as->pdir_page = NULL;
+ kfree(as->pte_count);
+ as->pte_count = NULL;
+}
+
+/*
+ * Maps PTBL for given iova and returns the PTE address
+ * Caller must unmap the mapped PTBL returned in *ptbl_page_p
+ */
+static unsigned long *locate_pte(struct smmu_as *as,
+ dma_addr_t iova, bool allocate,
+ struct page **ptbl_page_p,
+ unsigned int **count)
+{
+ unsigned long ptn = SMMU_ADDR_TO_PFN(iova);
+ unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
+ unsigned long *pdir = kmap(as->pdir_page);
+ unsigned long *ptbl;
+
+ if (pdir[pdn] != _PDE_VACANT(pdn)) {
+ /* Mapped entry table already exists */
+ *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]);
+ ptbl = kmap(*ptbl_page_p);
+ } else if (!allocate) {
+ kunmap(as->pdir_page);
+ return NULL;
+ } else {
+ int pn;
+ unsigned long addr = SMMU_PDN_TO_ADDR(pdn);
+
+ /* Vacant - allocate a new page table */
+ pr_debug("New PTBL pdn: %lx\n", pdn);
+
+ *ptbl_page_p = alloc_page(GFP_KERNEL | __GFP_DMA);
+ if (!*ptbl_page_p) {
+ kunmap(as->pdir_page);
+ pr_err("failed to allocate smmu_device page table\n");
+ return NULL;
+ }
+ SetPageReserved(*ptbl_page_p);
+ ptbl = (unsigned long *)kmap(*ptbl_page_p);
+ for (pn = 0; pn < SMMU_PTBL_COUNT;
+ pn++, addr += SMMU_PAGE_SIZE) {
+ ptbl[pn] = _PTE_VACANT(addr);
+ }
+ FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE);
+ pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p,
+ as->pde_attr | _PDE_NEXT);
+ FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
+ flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
+ as->pdir_page, 1);
+ }
+ *count = &as->pte_count[pdn];
+
+ kunmap(as->pdir_page);
+ return &ptbl[ptn % SMMU_PTBL_COUNT];
+}
+
+#ifdef CONFIG_SMMU_SIG_DEBUG
+static void put_signature(struct smmu_as *as,
+ dma_addr_t iova, unsigned long pfn)
+{
+ struct page *page;
+ unsigned long *vaddr;
+
+ page = pfn_to_page(pfn);
+ vaddr = kmap(page);
+ if (!vaddr)
+ return;
+
+ vaddr[0] = iova;
+ vaddr[1] = pfn << PAGE_SHIFT;
+ FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2);
+ kunmap(page);
+}
+#else
+static inline void put_signature(struct smmu_as *as,
+ unsigned long addr, unsigned long pfn)
+{
+}
+#endif
+
+/*
+ * Caller must lock/unlock as
+ */
+static int alloc_pdir(struct smmu_as *as)
+{
+ unsigned long *pdir;
+ int pdn;
+ u32 val;
+ struct smmu_device *smmu = as->smmu;
+
+ if (as->pdir_page)
+ return 0;
+
+ as->pte_count = kzalloc(sizeof(as->pte_count[0]) * SMMU_PDIR_COUNT,
+ GFP_KERNEL);
+ if (!as->pte_count) {
+ pr_err("failed to allocate smmu_device PTE cunters\n");
+ return -ENOMEM;
+ }
+ as->pdir_page = alloc_page(GFP_KERNEL | __GFP_DMA);
+ if (!as->pdir_page) {
+ pr_err("failed to allocate smmu_device page directory\n");
+ kfree(as->pte_count);
+ as->pte_count = NULL;
+ return -ENOMEM;
+ }
+ SetPageReserved(as->pdir_page);
+ pdir = kmap(as->pdir_page);
+
+ for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++)
+ pdir[pdn] = _PDE_VACANT(pdn);
+ FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE);
+ val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page);
+ smmu_write(smmu, val, SMMU_PTC_FLUSH);
+ FLUSH_SMMU_REGS(as->smmu);
+ val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
+ SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
+ (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
+ smmu_write(smmu, val, SMMU_TLB_FLUSH);
+ FLUSH_SMMU_REGS(as->smmu);
+ kunmap(as->pdir_page);
+
+ return 0;
+}
+
+static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova)
+{
+ unsigned long *pte;
+ struct page *page;
+ unsigned int *count;
+
+ pte = locate_pte(as, iova, false, &page, &count);
+ if (WARN_ON(!pte))
+ return;
+
+ if (WARN_ON(*pte == _PTE_VACANT(iova)))
+ return;
+
+ *pte = _PTE_VACANT(iova);
+ FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
+ flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
+ kunmap(page);
+ if (!--(*count)) {
+ free_ptbl(as, iova);
+ smmu_flush_regs(as->smmu, 0);
+ }
+}
+
+static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova,
+ unsigned long pfn)
+{
+ struct smmu_device *smmu = as->smmu;
+ unsigned long *pte;
+ unsigned int *count;
+ struct page *page;
+
+ pte = locate_pte(as, iova, true, &page, &count);
+ if (WARN_ON(!pte))
+ return;
+
+ if (*pte == _PTE_VACANT(iova))
+ (*count)++;
+ *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr);
+ if (unlikely((*pte == _PTE_VACANT(iova))))
+ (*count)--;
+ FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
+ flush_ptc_and_tlb(smmu, as, iova, pte, page, 0);
+ kunmap(page);
+ put_signature(as, iova, pfn);
+}
+
+static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t pa, int order, int prot)
+{
+ unsigned long count = (PAGE_SIZE << order) >> SMMU_PAGE_SHIFT;
+ struct smmu_as *as = domain->priv;
+ unsigned long pfn = __phys_to_pfn(pa);
+ int i;
+
+ pr_debug("[%d] %08lx:%08x(%ld)\n", as->asid, iova, pa, count);
+
+ if (!IS_ALIGNED(iova, PAGE_SIZE))
+ return -EINVAL;
+
+ mutex_lock(&as->lock);
+ for (i = 0; i < count; i++, pfn++) {
+
+ if (!pfn_valid(pfn))
+ goto fail;
+
+ __smmu_iommu_map_pfn(as, iova, pfn);
+ iova += SMMU_PAGE_SIZE;
+ }
+ mutex_unlock(&as->lock);
+ return 0;
+fail:
+ while (--i) {
+ iova -= SMMU_PAGE_SIZE;
+ __smmu_iommu_unmap(as, iova);
+ }
+ mutex_unlock(&as->lock);
+ return -ENOMEM;
+}
+
+static int smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
+ int gfp_order)
+{
+ struct smmu_as *as = domain->priv;
+ unsigned long count = (PAGE_SIZE << gfp_order) >> SMMU_PAGE_SHIFT;
+ int i;
+
+ pr_debug("[%d] %08lx(%ld)\n", as->asid, iova, count);
+
+ mutex_lock(&as->lock);
+ for (i = 0; i < count; i++) {
+ __smmu_iommu_unmap(as, iova);
+ iova += SMMU_PAGE_SIZE;
+ }
+ mutex_unlock(&as->lock);
+ return 0;
+}
+
+static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain,
+ unsigned long iova)
+{
+ struct smmu_as *as = domain->priv;
+ unsigned long *pte;
+ unsigned int *count;
+ struct page *page;
+ unsigned long pfn;
+
+ if (!IS_ALIGNED(iova, PAGE_SIZE))
+ return -EINVAL;
+
+ mutex_lock(&as->lock);
+
+ pte = locate_pte(as, iova, true, &page, &count);
+ pfn = *pte & SMMU_PFN_MASK;
+ WARN_ON(!pfn_valid(pfn));
+ pr_debug("iova:%08lx pfn:%08lx asid:%d\n", iova, pfn, as->asid);
+
+ mutex_unlock(&as->lock);
+ return PFN_PHYS(pfn);
+}
+
+static int smmu_iommu_domain_has_cap(struct iommu_domain *domain,
+ unsigned long cap)
+{
+ return 0;
+}
+
+static int smmu_iommu_domain_init(struct iommu_domain *domain)
+{
+ int i;
+ struct smmu_as *as;
+ struct smmu_device *smmu = smmu_handle;
+
+ /* Look for a free AS with lock held */
+ for (i = 0; i < smmu->num_ases; i++) {
+ struct smmu_as *tmp = &smmu->as[i];
+
+ mutex_lock(&tmp->lock);
+ if (!tmp->pdir_page) {
+ as = tmp;
+ goto found;
+ }
+ mutex_unlock(&tmp->lock);
+ }
+ pr_err("no free AS\n");
+ return -ENODEV;
+
+found:
+ if (alloc_pdir(as) < 0)
+ goto err_alloc_pdir;
+
+ spin_lock(&smmu->lock);
+
+ /* Update PDIR register */
+ smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
+ smmu_write(smmu,
+ SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA);
+ FLUSH_SMMU_REGS(smmu);
+
+ spin_unlock(&smmu->lock);
+
+ mutex_unlock(&as->lock);
+ domain->priv = as;
+ pr_debug("smmu_as@%p\n", as);
+ return 0;
+err_alloc_pdir:
+ mutex_unlock(&as->lock);
+ return -ENODEV;
+}
+
+static void smmu_iommu_domain_destroy(struct iommu_domain *domain)
+{
+ struct smmu_as *as = domain->priv;
+ struct smmu_device *smmu = as->smmu;
+
+ mutex_lock(&as->lock);
+
+ if (as->pdir_page) {
+ spin_lock(&smmu->lock);
+ smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
+ smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA);
+ FLUSH_SMMU_REGS(smmu);
+ spin_unlock(&smmu->lock);
+
+ free_pdir(as);
+ }
+
+ if (!list_empty(&as->client)) {
+ struct smmu_client *c;
+
+ list_for_each_entry(c, &as->client, list)
+ pr_err("%s is still attached\n", dev_name(c->dev));
+ }
+
+ mutex_unlock(&as->lock);
+
+ domain->priv = NULL;
+ pr_debug("smmu_as@%p\n", as);
+}
+
+static int smmu_iommu_attach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct smmu_as *as = domain->priv;
+ struct smmu_client *client, *c;
+ u32 map;
+ int err;
+
+ client = kmalloc(sizeof(*c), GFP_KERNEL);
+ if (!client)
+ return -ENOMEM;
+ client->dev = dev;
+ client->as = as;
+ map = (unsigned long)dev->platform_data;
+ if (!map)
+ return -EINVAL;
+
+ err = smmu_client_enable_hwgrp(client, map);
+ if (err)
+ goto err_hwgrp;
+
+ spin_lock(&as->client_lock);
+ list_for_each_entry(c, &as->client, list) {
+ if (c->dev == dev) {
+ pr_err("%s is already attached\n", dev_name(dev));
+ err = -EINVAL;
+ goto err_client;
+ }
+ }
+ list_add(&client->list, &as->client);
+ spin_unlock(&as->client_lock);
+
+ /*
+ * Reserve "page zero" for AVP vectors using a common dummy
+ * page.
+ */
+ if (map & HWG_AVPC) {
+ struct page *page;
+
+ page = as->smmu->avp_vector_page;
+ __smmu_iommu_map_pfn(as, 0, page_to_pfn(page));
+
+ pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n");
+ }
+
+ pr_debug("Attached %s\n", dev_name(dev));
+ return 0;
+err_client:
+ smmu_client_disable_hwgrp(client);
+ spin_unlock(&as->client_lock);
+err_hwgrp:
+ kfree(client);
+ return err;
+}
+
+static void smmu_iommu_detach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct smmu_as *as = domain->priv;
+ struct smmu_client *c;
+
+ spin_lock(&as->client_lock);
+
+ list_for_each_entry(c, &as->client, list) {
+ if (c->dev == dev) {
+ smmu_client_disable_hwgrp(c);
+ list_del(&c->list);
+ c->as = NULL;
+ pr_debug("Detached %s\n", dev_name(dev));
+ goto out;
+ }
+ }
+ pr_err("Couldn't find %s\n", dev_name(dev));
+out:
+ spin_unlock(&as->client_lock);
+}
+
+static struct iommu_ops smmu_iommu_ops = {
+ .domain_init = smmu_iommu_domain_init,
+ .domain_destroy = smmu_iommu_domain_destroy,
+ .attach_dev = smmu_iommu_attach_dev,
+ .detach_dev = smmu_iommu_detach_dev,
+ .map = smmu_iommu_map,
+ .unmap = smmu_iommu_unmap,
+ .iova_to_phys = smmu_iommu_iova_to_phys,
+ .domain_has_cap = smmu_iommu_domain_has_cap,
+};
+
+static int smmu_iommu_suspend(struct device *dev)
+{
+ struct smmu_device *smmu = dev_get_drvdata(dev);
+
+ smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0);
+ smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1);
+ smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2);
+ smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY);
+ return 0;
+}
+
+static int smmu_iommu_resume(struct device *dev)
+{
+ struct smmu_device *smmu = dev_get_drvdata(dev);
+
+ spin_lock(&smmu->lock);
+ smmu_setup_regs(smmu);
+ spin_unlock(&smmu->lock);
+ return 0;
+}
+
+static int smmu_iommu_probe(struct platform_device *pdev)
+{
+ struct smmu_device *smmu;
+ struct resource *regs, *regs2, *window;
+ int i, err = 0;
+
+ BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT);
+
+ regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mc");
+ regs2 = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahbarb");
+ window = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iovm");
+ if (!regs || !regs2 || !window) {
+ pr_err("No SMMU resources\n");
+ return -ENODEV;
+ }
+
+ smmu = kzalloc(sizeof(*smmu), GFP_KERNEL);
+ if (!smmu) {
+ pr_err("failed to allocate smmu_device\n");
+ return -ENOMEM;
+ }
+
+ smmu->num_ases = SMMU_NUM_ASIDS;
+ smmu->iovmm_base = (dma_addr_t)window->start;
+ smmu->page_count = resource_size(window) >> SMMU_PAGE_SHIFT;
+ smmu->regs = ioremap(regs->start, resource_size(regs));
+ smmu->regs_ahbarb = ioremap(regs2->start, resource_size(regs2));
+ if (!smmu->regs || !smmu->regs_ahbarb) {
+ pr_err("failed to remap SMMU registers\n");
+ err = -ENXIO;
+ goto fail;
+ }
+
+ smmu->translation_enable_0 = ~0;
+ smmu->translation_enable_1 = ~0;
+ smmu->translation_enable_2 = ~0;
+ smmu->asid_security = 0;
+
+ smmu->as = kzalloc(sizeof(smmu->as[0]) * smmu->num_ases, GFP_KERNEL);
+ if (!smmu->as) {
+ pr_err("failed to allocate smmu_as\n");
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ for (i = 0; i < smmu->num_ases; i++) {
+ struct smmu_as *as = &smmu->as[i];
+
+ as->smmu = smmu;
+ as->asid = i;
+ as->pdir_attr = _PDIR_ATTR;
+ as->pde_attr = _PDE_ATTR;
+ as->pte_attr = _PTE_ATTR;
+
+ mutex_init(&as->lock);
+ INIT_LIST_HEAD(&as->client);
+ }
+ spin_lock_init(&smmu->lock);
+ smmu_setup_regs(smmu);
+ platform_set_drvdata(pdev, smmu);
+ smmu_handle = smmu;
+
+ smmu->avp_vector_page = alloc_page(GFP_KERNEL);
+ if (!smmu->avp_vector_page)
+ goto fail;
+ return 0;
+fail:
+ if (smmu->avp_vector_page)
+ __free_page(smmu->avp_vector_page);
+ if (smmu->regs)
+ iounmap(smmu->regs);
+ if (smmu->regs_ahbarb)
+ iounmap(smmu->regs_ahbarb);
+ if (smmu && smmu->as) {
+ for (i = 0; i < smmu->num_ases; i++) {
+ if (smmu->as[i].pdir_page) {
+ ClearPageReserved(smmu->as[i].pdir_page);
+ __free_page(smmu->as[i].pdir_page);
+ }
+ }
+ kfree(smmu->as);
+ }
+ kfree(smmu);
+ return err;
+}
+
+static int smmu_iommu_remove(struct platform_device *pdev)
+{
+ struct smmu_device *smmu = platform_get_drvdata(pdev);
+
+ smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG);
+ platform_set_drvdata(pdev, NULL);
+ if (smmu->as) {
+ int i;
+
+ for (i = 0; i < smmu->num_ases; i++)
+ free_pdir(&smmu->as[i]);
+ kfree(smmu->as);
+ }
+ if (smmu->avp_vector_page)
+ __free_page(smmu->avp_vector_page);
+ if (smmu->regs)
+ iounmap(smmu->regs);
+ if (smmu->regs_ahbarb)
+ iounmap(smmu->regs_ahbarb);
+ kfree(smmu);
+ smmu_handle = NULL;
+ return 0;
+}
+
+const struct dev_pm_ops smmu_iommu_pm_ops = {
+ .suspend = smmu_iommu_suspend,
+ .resume = smmu_iommu_resume,
+};
+
+static struct platform_driver smmu_iommu_driver = {
+ .probe = smmu_iommu_probe,
+ .remove = smmu_iommu_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "smmu-iommu",
+ .pm = &smmu_iommu_pm_ops,
+ },
+};
+
+static int __devinit smmu_iommu_init(void)
+{
+ bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
+ return platform_driver_register(&smmu_iommu_driver);
+}
+
+static void __exit smmu_iommu_exit(void)
+{
+ platform_driver_unregister(&smmu_iommu_driver);
+}
+
+subsys_initcall(smmu_iommu_init);
+module_exit(smmu_iommu_exit);
--
1.7.5.4
More information about the linux-arm-kernel
mailing list