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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     joro@8bytes.org, will@kernel.org, robh+dt@kernel.org,
        xxm@rock-chips.com,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc:     iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        kernel@collabora.com,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>
Subject: Re: [PATCH v4 6/6] iommu: rockchip: Add support iommu v2
Date:   Mon, 17 May 2021 14:16:17 +0200
Message-ID: <12100695.VsHLxoZxqI@diego>
In-Reply-To: <20210507090232.233049-7-benjamin.gaignard@collabora.com>
References: <20210507090232.233049-1-benjamin.gaignard@collabora.com> <20210507090232.233049-7-benjamin.gaignard@collabora.com>
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Precedence: bulk

Hi Benjamin,

Am Freitag, 7. Mai 2021, 11:02:32 CEST schrieb Benjamin Gaignard:
> From: Simon Xue <xxm@rock-chips.com>
> 
> RK356x SoC got new IOMMU hardware block (version 2).
> Add a compatible to distinguish it from the first version.
> 
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> [Benjamin]
> - port driver from kernel 4.19 to 5.12
> - change functions prototype.
> - squash all fixes in this commit.
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
>  drivers/iommu/rockchip-iommu.c | 422 +++++++++++++++++++++++++++++++--
>  1 file changed, 406 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index e5d86b7177de..32dcf0aaec18 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -19,6 +19,7 @@
>  #include <linux/iopoll.h>
>  #include <linux/list.h>
>  #include <linux/mm.h>
> +#include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/of.h>
>  #include <linux/of_iommu.h>
> @@ -81,6 +82,30 @@
>    */
>  #define RK_IOMMU_PGSIZE_BITMAP 0x007ff000
>  
> +#define DT_LO_MASK 0xfffff000
> +#define DT_HI_MASK GENMASK_ULL(39, 32)
> +#define DT_SHIFT   28
> +
> +#define DTE_BASE_HI_MASK GENMASK(11, 4)
> +
> +#define PAGE_DESC_LO_MASK   0xfffff000
> +#define PAGE_DESC_HI1_LOWER 32
> +#define PAGE_DESC_HI1_UPPER 35
> +#define PAGE_DESC_HI2_LOWER 36
> +#define PAGE_DESC_HI2_UPPER 39
> +#define PAGE_DESC_HI_MASK1  GENMASK_ULL(PAGE_DESC_HI1_UPPER, PAGE_DESC_HI1_LOWER)
> +#define PAGE_DESC_HI_MASK2  GENMASK_ULL(PAGE_DESC_HI2_UPPER, PAGE_DESC_HI2_LOWER)
> +
> +#define DTE_HI1_LOWER 8
> +#define DTE_HI1_UPPER 11
> +#define DTE_HI2_LOWER 4
> +#define DTE_HI2_UPPER 7
> +#define DTE_HI_MASK1  GENMASK(DTE_HI1_UPPER, DTE_HI1_LOWER)
> +#define DTE_HI_MASK2  GENMASK(DTE_HI2_UPPER, DTE_HI2_LOWER)
> +
> +#define PAGE_DESC_HI_SHIFT1 (PAGE_DESC_HI1_LOWER - DTE_HI1_LOWER)
> +#define PAGE_DESC_HI_SHIFT2 (PAGE_DESC_HI2_LOWER - DTE_HI2_LOWER)
> +
>  struct rk_iommu_domain {
>  	struct list_head iommus;
>  	u32 *dt; /* page directory table */
> @@ -91,6 +116,10 @@ struct rk_iommu_domain {
>  	struct iommu_domain domain;
>  };
>  
> +struct rockchip_iommu_data {
> +	u32 version;

could you add here maybe pointers to the version-specific iommu-ops struct
as well as the version-specific functions?

That way we save all the "if version == 2" conditionals below and would just
call the relevant function pointers?

> +};
> +
>  /* list of clocks required by IOMMU */
>  static const char * const rk_iommu_clocks[] = {
>  	"aclk", "iface",
> @@ -108,6 +137,7 @@ struct rk_iommu {
>  	struct list_head node; /* entry in rk_iommu_domain.iommus */
>  	struct iommu_domain *domain; /* domain to which iommu is attached */
>  	struct iommu_group *group;
> +	u32 version;

keep the struct rockchip_iommu_data from match-data here instead? I.e.
+	struct rockchip_iommu_data *data;

>  };
>  
>  struct rk_iommudata {
> @@ -174,11 +204,32 @@ static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
>  #define RK_DTE_PT_ADDRESS_MASK    0xfffff000
>  #define RK_DTE_PT_VALID           BIT(0)
>  
> +/*
> + * In v2:
> + * 31:12 - PT address bit 31:0
> + * 11: 8 - PT address bit 35:32
> + *  7: 4 - PT address bit 39:36
> + *  3: 1 - Reserved
> + *     0 - 1 if PT @ PT address is valid
> + */
> +#define RK_DTE_PT_ADDRESS_MASK_V2 0xfffffff0
> +
>  static inline phys_addr_t rk_dte_pt_address(u32 dte)
>  {
>  	return (phys_addr_t)dte & RK_DTE_PT_ADDRESS_MASK;
>  }
>  
> +static inline phys_addr_t rk_dte_pt_address_v2(u32 dte)
> +{
> +	u64 dte_v2 = dte;
> +
> +	dte_v2 = ((dte_v2 & DTE_HI_MASK2) << PAGE_DESC_HI_SHIFT2) |
> +		 ((dte_v2 & DTE_HI_MASK1) << PAGE_DESC_HI_SHIFT1) |
> +		 (dte_v2 & PAGE_DESC_LO_MASK);
> +
> +	return (phys_addr_t)dte_v2;
> +}
> +
>  static inline bool rk_dte_is_pt_valid(u32 dte)
>  {
>  	return dte & RK_DTE_PT_VALID;
> @@ -189,6 +240,15 @@ static inline u32 rk_mk_dte(dma_addr_t pt_dma)
>  	return (pt_dma & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID;
>  }
>  
> +static inline u32 rk_mk_dte_v2(dma_addr_t pt_dma)
> +{
> +	pt_dma = (pt_dma & PAGE_DESC_LO_MASK) |
> +		 ((pt_dma & PAGE_DESC_HI_MASK1) >> PAGE_DESC_HI_SHIFT1) |
> +		 (pt_dma & PAGE_DESC_HI_MASK2) >> PAGE_DESC_HI_SHIFT2;
> +
> +	return (pt_dma & RK_DTE_PT_ADDRESS_MASK_V2) | RK_DTE_PT_VALID;
> +}
> +
>  /*
>   * Each PTE has a Page address, some flags and a valid bit:
>   * +---------------------+---+-------+-+
> @@ -215,11 +275,37 @@ static inline u32 rk_mk_dte(dma_addr_t pt_dma)
>  #define RK_PTE_PAGE_READABLE      BIT(1)
>  #define RK_PTE_PAGE_VALID         BIT(0)
>  
> +/*
> + * In v2:
> + * 31:12 - Page address bit 31:0
> + *  11:9 - Page address bit 34:32
> + *   8:4 - Page address bit 39:35
> + *     3 - Security
> + *     2 - Readable
> + *     1 - Writable
> + *     0 - 1 if Page @ Page address is valid
> + */
> +#define RK_PTE_PAGE_ADDRESS_MASK_V2  0xfffffff0
> +#define RK_PTE_PAGE_FLAGS_MASK_V2    0x0000000e
> +#define RK_PTE_PAGE_READABLE_V2      BIT(2)
> +#define RK_PTE_PAGE_WRITABLE_V2      BIT(1)
> +
>  static inline phys_addr_t rk_pte_page_address(u32 pte)
>  {
>  	return (phys_addr_t)pte & RK_PTE_PAGE_ADDRESS_MASK;
>  }
>  
> +static inline phys_addr_t rk_pte_page_address_v2(u32 pte)
> +{
> +	u64 pte_v2 = pte;
> +
> +	pte_v2 = ((pte_v2 & DTE_HI_MASK2) << PAGE_DESC_HI_SHIFT2) |
> +		 ((pte_v2 & DTE_HI_MASK1) << PAGE_DESC_HI_SHIFT1) |
> +		 (pte_v2 & PAGE_DESC_LO_MASK);
> +
> +	return (phys_addr_t)pte_v2;
> +}
> +
>  static inline bool rk_pte_is_page_valid(u32 pte)
>  {
>  	return pte & RK_PTE_PAGE_VALID;
> @@ -229,12 +315,26 @@ static inline bool rk_pte_is_page_valid(u32 pte)
>  static u32 rk_mk_pte(phys_addr_t page, int prot)
>  {
>  	u32 flags = 0;
> +
>  	flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0;
>  	flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0;
>  	page &= RK_PTE_PAGE_ADDRESS_MASK;
>  	return page | flags | RK_PTE_PAGE_VALID;
>  }
>  
> +static u32 rk_mk_pte_v2(phys_addr_t page, int prot)
> +{
> +	u32 flags = 0;
> +
> +	flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE_V2 : 0;
> +	flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE_V2 : 0;
> +	page = (page & PAGE_DESC_LO_MASK) |
> +	       ((page & PAGE_DESC_HI_MASK1) >> PAGE_DESC_HI_SHIFT1) |
> +	       (page & PAGE_DESC_HI_MASK2) >> PAGE_DESC_HI_SHIFT2;
> +	page &= RK_PTE_PAGE_ADDRESS_MASK_V2;
> +	return page | flags | RK_PTE_PAGE_VALID;
> +}
> +
>  static u32 rk_mk_pte_invalid(u32 pte)
>  {
>  	return pte & ~RK_PTE_PAGE_VALID;
> @@ -439,6 +539,7 @@ static int rk_iommu_force_reset(struct rk_iommu *iommu)
>  	int ret, i;
>  	u32 dte_addr;
>  	bool val;
> +	u32 address_mask;
>  
>  	if (iommu->reset_disabled)
>  		return 0;
> @@ -447,11 +548,19 @@ static int rk_iommu_force_reset(struct rk_iommu *iommu)
>  	 * Check if register DTE_ADDR is working by writing DTE_ADDR_DUMMY
>  	 * and verifying that upper 5 nybbles are read back.
>  	 */
> +
> +	/*
> +	 * In v2: upper 7 nybbles are read back.
> +	 */
>  	for (i = 0; i < iommu->num_mmu; i++) {
>  		rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, DTE_ADDR_DUMMY);
>  
> +		if (iommu->version >= 0x2)
> +			address_mask = RK_DTE_PT_ADDRESS_MASK_V2;
> +		else
> +			address_mask = RK_DTE_PT_ADDRESS_MASK;
>  		dte_addr = rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR);
> -		if (dte_addr != (DTE_ADDR_DUMMY & RK_DTE_PT_ADDRESS_MASK)) {
> +		if (dte_addr != (DTE_ADDR_DUMMY & address_mask)) {

+		if (dte_addr != (DTE_ADDR_DUMMY & iommu->data->dte_pt_address_mask)) {
 maybe?

>  			dev_err(iommu->dev, "Error during raw reset. MMU_DTE_ADDR is not functioning\n");
>  			return -EFAULT;
>  		}
> @@ -490,6 +599,10 @@ static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova)
>  
>  	mmu_dte_addr = rk_iommu_read(base, RK_MMU_DTE_ADDR);
>  	mmu_dte_addr_phys = (phys_addr_t)mmu_dte_addr;
> +	if (iommu->version >= 0x2) {
> +		mmu_dte_addr_phys = (mmu_dte_addr_phys & DT_LO_MASK) |
> +				    ((mmu_dte_addr_phys & DTE_BASE_HI_MASK) << DT_SHIFT);
> +	}
>  
>  	dte_addr_phys = mmu_dte_addr_phys + (4 * dte_index);
>  	dte_addr = phys_to_virt(dte_addr_phys);
> @@ -498,14 +611,20 @@ static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova)
>  	if (!rk_dte_is_pt_valid(dte))
>  		goto print_it;
>  
> -	pte_addr_phys = rk_dte_pt_address(dte) + (pte_index * 4);
> +	if (iommu->version >= 0x2)
> +		pte_addr_phys = rk_dte_pt_address_v2(dte) + (pte_index * 4);
> +	else
> +		pte_addr_phys = rk_dte_pt_address(dte) + (pte_index * 4);

see above maybe
	pte_addr_phys = iommu->data->dte_pt_address(dte) + (pte_index * 4)

same for all the if version == 2, else conditionals?


Heiko

>  	pte_addr = phys_to_virt(pte_addr_phys);
>  	pte = *pte_addr;
>  
>  	if (!rk_pte_is_page_valid(pte))
>  		goto print_it;
>  
> -	page_addr_phys = rk_pte_page_address(pte) + page_offset;
> +	if (iommu->version >= 0x2)
> +		page_addr_phys = rk_pte_page_address_v2(pte) + page_offset;
> +	else
> +		page_addr_phys = rk_pte_page_address(pte) + page_offset;
>  	page_flags = pte & RK_PTE_PAGE_FLAGS_MASK;
>  
>  print_it:
> @@ -522,6 +641,7 @@ static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
>  	struct rk_iommu *iommu = dev_id;
>  	u32 status;
>  	u32 int_status;
> +	u32 int_mask;
>  	dma_addr_t iova;
>  	irqreturn_t ret = IRQ_NONE;
>  	int i, err;
> @@ -566,7 +686,15 @@ static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
>  				dev_err(iommu->dev, "Page fault while iommu not attached to domain?\n");
>  
>  			rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
> -			rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_PAGE_FAULT_DONE);
> +
> +			/*
> +			 * Master may clear the int_mask to prevent iommu
> +			 * re-enter interrupt when mapping. So we postpone
> +			 * sending PAGE_FAULT_DONE command to mapping finished.
> +			 */
> +			int_mask = rk_iommu_read(iommu->bases[i], RK_MMU_INT_MASK);
> +			if (int_mask != 0x0)
> +				rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_PAGE_FAULT_DONE);
>  		}
>  
>  		if (int_status & RK_MMU_IRQ_BUS_ERROR)
> @@ -614,6 +742,34 @@ static phys_addr_t rk_iommu_iova_to_phys(struct iommu_domain *domain,
>  	return phys;
>  }
>  
> +static phys_addr_t rk_iommu_iova_to_phys_v2(struct iommu_domain *domain,
> +					    dma_addr_t iova)
> +{
> +	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
> +	unsigned long flags;
> +	phys_addr_t pt_phys, phys = 0;
> +	u32 dte, pte;
> +	u32 *page_table;
> +
> +	spin_lock_irqsave(&rk_domain->dt_lock, flags);
> +
> +	dte = rk_domain->dt[rk_iova_dte_index(iova)];
> +	if (!rk_dte_is_pt_valid(dte))
> +		goto out;
> +
> +	pt_phys = rk_dte_pt_address_v2(dte);
> +	page_table = (u32 *)phys_to_virt(pt_phys);
> +	pte = page_table[rk_iova_pte_index(iova)];
> +	if (!rk_pte_is_page_valid(pte))
> +		goto out;
> +
> +	phys = rk_pte_page_address_v2(pte) + rk_iova_page_offset(iova);
> +out:
> +	spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
> +
> +	return phys;
> +}
> +
>  static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain,
>  			      dma_addr_t iova, size_t size)
>  {
> @@ -690,6 +846,44 @@ static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
>  	return (u32 *)phys_to_virt(pt_phys);
>  }
>  
> +static u32 *rk_dte_get_page_table_v2(struct rk_iommu_domain *rk_domain,
> +				     dma_addr_t iova)
> +{
> +	u32 *page_table, *dte_addr;
> +	u32 dte_index, dte;
> +	phys_addr_t pt_phys;
> +	dma_addr_t pt_dma;
> +
> +	assert_spin_locked(&rk_domain->dt_lock);
> +
> +	dte_index = rk_iova_dte_index(iova);
> +	dte_addr = &rk_domain->dt[dte_index];
> +	dte = *dte_addr;
> +	if (rk_dte_is_pt_valid(dte))
> +		goto done;
> +
> +	page_table = (u32 *)get_zeroed_page(GFP_ATOMIC | GFP_DMA32);
> +	if (!page_table)
> +		return ERR_PTR(-ENOMEM);
> +
> +	pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
> +	if (dma_mapping_error(dma_dev, pt_dma)) {
> +		dev_err(dma_dev, "DMA mapping error while allocating page table\n");
> +		free_page((unsigned long)page_table);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	dte = rk_mk_dte_v2(pt_dma);
> +	*dte_addr = dte;
> +
> +	rk_table_flush(rk_domain, pt_dma, NUM_PT_ENTRIES);
> +	rk_table_flush(rk_domain,
> +		       rk_domain->dt_dma + dte_index * sizeof(u32), 1);
> +done:
> +	pt_phys = rk_dte_pt_address_v2(dte);
> +	return (u32 *)phys_to_virt(pt_phys);
> +}
> +
>  static size_t rk_iommu_unmap_iova(struct rk_iommu_domain *rk_domain,
>  				  u32 *pte_addr, dma_addr_t pte_dma,
>  				  size_t size)
> @@ -757,6 +951,45 @@ static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr,
>  	return -EADDRINUSE;
>  }
>  
> +static int rk_iommu_map_iova_v2(struct rk_iommu_domain *rk_domain, u32 *pte_addr,
> +				dma_addr_t pte_dma, dma_addr_t iova,
> +				phys_addr_t paddr, size_t size, int prot)
> +{
> +	unsigned int pte_count;
> +	unsigned int pte_total = size / SPAGE_SIZE;
> +	phys_addr_t page_phys;
> +
> +	assert_spin_locked(&rk_domain->dt_lock);
> +
> +	for (pte_count = 0; pte_count < pte_total; pte_count++) {
> +		u32 pte = pte_addr[pte_count];
> +
> +		if (rk_pte_is_page_valid(pte))
> +			goto unwind;
> +
> +		pte_addr[pte_count] = rk_mk_pte_v2(paddr, prot);
> +
> +		paddr += SPAGE_SIZE;
> +	}
> +
> +	rk_table_flush(rk_domain, pte_dma, pte_total);
> +
> +	rk_iommu_zap_iova_first_last(rk_domain, iova, size);
> +
> +	return 0;
> +unwind:
> +	/* Unmap the range of iovas that we just mapped */
> +	rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma,
> +			    pte_count * SPAGE_SIZE);
> +
> +	iova += pte_count * SPAGE_SIZE;
> +	page_phys = rk_pte_page_address_v2(pte_addr[pte_count]);
> +	pr_err("iova: %pad already mapped to %pa cannot remap to phys: %pa prot: %#x\n",
> +	       &iova, &page_phys, &paddr, prot);
> +
> +	return -EADDRINUSE;
> +}
> +
>  static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
>  			phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
>  {
> @@ -764,7 +997,7 @@ static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
>  	unsigned long flags;
>  	dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
>  	u32 *page_table, *pte_addr;
> -	u32 dte_index, pte_index;
> +	u32 dte, pte_index;
>  	int ret;
>  
>  	spin_lock_irqsave(&rk_domain->dt_lock, flags);
> @@ -782,10 +1015,10 @@ static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
>  		return PTR_ERR(page_table);
>  	}
>  
> -	dte_index = rk_domain->dt[rk_iova_dte_index(iova)];
> +	dte = rk_domain->dt[rk_iova_dte_index(iova)];
>  	pte_index = rk_iova_pte_index(iova);
>  	pte_addr = &page_table[pte_index];
> -	pte_dma = rk_dte_pt_address(dte_index) + pte_index * sizeof(u32);
> +	pte_dma = rk_dte_pt_address(dte) + pte_index * sizeof(u32);
>  	ret = rk_iommu_map_iova(rk_domain, pte_addr, pte_dma, iova,
>  				paddr, size, prot);
>  
> @@ -794,6 +1027,43 @@ static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
>  	return ret;
>  }
>  
> +static int rk_iommu_map_v2(struct iommu_domain *domain, unsigned long _iova,
> +			   phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
> +{
> +	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
> +	unsigned long flags;
> +	dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
> +	u32 *page_table, *pte_addr;
> +	u32 dte, pte_index;
> +	int ret;
> +
> +	spin_lock_irqsave(&rk_domain->dt_lock, flags);
> +
> +	/*
> +	 * pgsize_bitmap specifies iova sizes that fit in one page table
> +	 * (1024 4-KiB pages = 4 MiB).
> +	 * So, size will always be 4096 <= size <= 4194304.
> +	 * Since iommu_map() guarantees that both iova and size will be
> +	 * aligned, we will always only be mapping from a single dte here.
> +	 */
> +	page_table = rk_dte_get_page_table_v2(rk_domain, iova);
> +	if (IS_ERR(page_table)) {
> +		spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
> +		return PTR_ERR(page_table);
> +	}
> +
> +	dte = rk_domain->dt[rk_iova_dte_index(iova)];
> +	pte_index = rk_iova_pte_index(iova);
> +	pte_addr = &page_table[pte_index];
> +	pte_dma = rk_dte_pt_address_v2(dte) + pte_index * sizeof(u32);
> +	ret = rk_iommu_map_iova_v2(rk_domain, pte_addr, pte_dma, iova,
> +				   paddr, size, prot);
> +
> +	spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
> +
> +	return ret;
> +}
> +
>  static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
>  			     size_t size, struct iommu_iotlb_gather *gather)
>  {
> @@ -834,6 +1104,46 @@ static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
>  	return unmap_size;
>  }
>  
> +static size_t rk_iommu_unmap_v2(struct iommu_domain *domain, unsigned long _iova,
> +				size_t size, struct iommu_iotlb_gather *gather)
> +{
> +	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
> +	unsigned long flags;
> +	dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
> +	phys_addr_t pt_phys;
> +	u32 dte;
> +	u32 *pte_addr;
> +	size_t unmap_size;
> +
> +	spin_lock_irqsave(&rk_domain->dt_lock, flags);
> +
> +	/*
> +	 * pgsize_bitmap specifies iova sizes that fit in one page table
> +	 * (1024 4-KiB pages = 4 MiB).
> +	 * So, size will always be 4096 <= size <= 4194304.
> +	 * Since iommu_unmap() guarantees that both iova and size will be
> +	 * aligned, we will always only be unmapping from a single dte here.
> +	 */
> +	dte = rk_domain->dt[rk_iova_dte_index(iova)];
> +	/* Just return 0 if iova is unmapped */
> +	if (!rk_dte_is_pt_valid(dte)) {
> +		spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
> +		return 0;
> +	}
> +
> +	pt_phys = rk_dte_pt_address_v2(dte);
> +	pte_addr = (u32 *)phys_to_virt(pt_phys) + rk_iova_pte_index(iova);
> +	pte_dma = pt_phys + rk_iova_pte_index(iova) * sizeof(u32);
> +	unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, size);
> +
> +	spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
> +
> +	/* Shootdown iotlb entries for iova range that was just unmapped */
> +	rk_iommu_zap_iova(rk_domain, iova, unmap_size);
> +
> +	return unmap_size;
> +}
> +
>  static struct rk_iommu *rk_iommu_from_dev(struct device *dev)
>  {
>  	struct rk_iommudata *data = dev_iommu_priv_get(dev);
> @@ -864,6 +1174,7 @@ static int rk_iommu_enable(struct rk_iommu *iommu)
>  	struct iommu_domain *domain = iommu->domain;
>  	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
>  	int ret, i;
> +	u32 dt_v2;
>  
>  	ret = clk_bulk_enable(iommu->num_clocks, iommu->clocks);
>  	if (ret)
> @@ -878,8 +1189,14 @@ static int rk_iommu_enable(struct rk_iommu *iommu)
>  		goto out_disable_stall;
>  
>  	for (i = 0; i < iommu->num_mmu; i++) {
> -		rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
> -			       rk_domain->dt_dma);
> +		if (iommu->version >= 0x2) {
> +			dt_v2 = (rk_domain->dt_dma & DT_LO_MASK) |
> +				((rk_domain->dt_dma & DT_HI_MASK) >> DT_SHIFT);
> +			rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, dt_v2);
> +		} else {
> +			rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
> +				       rk_domain->dt_dma);
> +		}
>  		rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
>  		rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, RK_MMU_IRQ_MASK);
>  	}
> @@ -1054,6 +1371,34 @@ static void rk_iommu_domain_free(struct iommu_domain *domain)
>  	kfree(rk_domain);
>  }
>  
> +static void rk_iommu_domain_free_v2(struct iommu_domain *domain)
> +{
> +	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
> +	int i;
> +
> +	WARN_ON(!list_empty(&rk_domain->iommus));
> +
> +	for (i = 0; i < NUM_DT_ENTRIES; i++) {
> +		u32 dte = rk_domain->dt[i];
> +
> +		if (rk_dte_is_pt_valid(dte)) {
> +			phys_addr_t pt_phys = rk_dte_pt_address_v2(dte);
> +			u32 *page_table = phys_to_virt(pt_phys);
> +
> +			dma_unmap_single(dma_dev, pt_phys,
> +					 SPAGE_SIZE, DMA_TO_DEVICE);
> +			free_page((unsigned long)page_table);
> +		}
> +	}
> +	dma_unmap_single(dma_dev, rk_domain->dt_dma,
> +			 SPAGE_SIZE, DMA_TO_DEVICE);
> +	free_page((unsigned long)rk_domain->dt);
> +
> +	if (domain->type == IOMMU_DOMAIN_DMA)
> +		iommu_put_dma_cookie(&rk_domain->domain);
> +	kfree(rk_domain);
> +}
> +
>  static struct iommu_device *rk_iommu_probe_device(struct device *dev)
>  {
>  	struct rk_iommudata *data;
> @@ -1122,6 +1467,40 @@ static const struct iommu_ops rk_iommu_ops = {
>  	.of_xlate = rk_iommu_of_xlate,
>  };
>  
> +static const struct iommu_ops rk_iommu_ops_v2 = {
> +	.domain_alloc = rk_iommu_domain_alloc,
> +	.domain_free = rk_iommu_domain_free_v2,
> +	.attach_dev = rk_iommu_attach_device,
> +	.detach_dev = rk_iommu_detach_device,
> +	.map = rk_iommu_map_v2,
> +	.unmap = rk_iommu_unmap_v2,
> +	.probe_device = rk_iommu_probe_device,
> +	.release_device = rk_iommu_release_device,
> +	.iova_to_phys = rk_iommu_iova_to_phys_v2,
> +	.device_group = rk_iommu_device_group,
> +	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
> +	.of_xlate = rk_iommu_of_xlate,
> +};
> +
> +static const struct rockchip_iommu_data iommu_data_v1 = {
> +	.version = 0x1,
> +};
> +
> +static const struct rockchip_iommu_data iommu_data_v2 = {
> +	.version = 0x2,
> +};
> +
> +static const struct of_device_id rk_iommu_dt_ids[] = {
> +	{	.compatible = "rockchip,iommu",
> +		.data = &iommu_data_v1,
> +	}, {
> +		.compatible = "rockchip,rk3568-iommu",
> +		.data = &iommu_data_v2,
> +	},
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rk_iommu_dt_ids);
> +
>  static int rk_iommu_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -1129,11 +1508,21 @@ static int rk_iommu_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	int num_res = pdev->num_resources;
>  	int err, i;
> +	const struct of_device_id *match;
> +	struct rockchip_iommu_data *data;
>  
>  	iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
>  	if (!iommu)
>  		return -ENOMEM;
>  
> +	match = of_match_device(rk_iommu_dt_ids, dev);
> +	if (!match)
> +		return -EINVAL;
> +
> +	data = (struct rockchip_iommu_data *)match->data;
> +	iommu->version = data->version;
> +	dev_info(dev, "version = %x\n", iommu->version);
> +
>  	platform_set_drvdata(pdev, iommu);
>  	iommu->dev = dev;
>  	iommu->num_mmu = 0;
> @@ -1196,7 +1585,10 @@ static int rk_iommu_probe(struct platform_device *pdev)
>  	if (err)
>  		goto err_put_group;
>  
> -	iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops);
> +	if (iommu->version >= 0x2)
> +		iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops_v2);
> +	else
> +		iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops);
>  	iommu_device_set_fwnode(&iommu->iommu, &dev->of_node->fwnode);
>  
>  	err = iommu_device_register(&iommu->iommu);
> @@ -1211,7 +1603,10 @@ static int rk_iommu_probe(struct platform_device *pdev)
>  	if (!dma_dev)
>  		dma_dev = &pdev->dev;
>  
> -	bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
> +	if (iommu->version >= 0x2)
> +		bus_set_iommu(&platform_bus_type, &rk_iommu_ops_v2);
> +	else
> +		bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
>  
>  	pm_runtime_enable(dev);
>  
> @@ -1280,11 +1675,6 @@ static const struct dev_pm_ops rk_iommu_pm_ops = {
>  				pm_runtime_force_resume)
>  };
>  
> -static const struct of_device_id rk_iommu_dt_ids[] = {
> -	{ .compatible = "rockchip,iommu" },
> -	{ /* sentinel */ }
> -};
> -
>  static struct platform_driver rk_iommu_driver = {
>  	.probe = rk_iommu_probe,
>  	.shutdown = rk_iommu_shutdown,
>