[PATCH v3 1/2] iommu/io-pgtable-arm-v7s: Add a quirk to allow pgtable PA up to 35bit

[PATCH v3 1/2] iommu/io-pgtable-arm-v7s: Add a quirk to allow pgtable PA up to 35bit

[yf.wang--- via iommu]

From: Yunfei Wang <yf.wang@mediatek.com>

The calling to kmem_cache_alloc for level 2 pgtable allocation may run
in atomic context, and it fails sometimes when DMA32 zone runs out of
memory.

Since Mediatek IOMMU hardware support at most 35bit PA in pgtable,
so add a quirk to allow the PA of pgtables support up to bit35.

Signed-off-by: Ning Li <ning.li@mediatek.com>
Signed-off-by: Yunfei Wang <yf.wang@mediatek.com>
---
 drivers/iommu/io-pgtable-arm-v7s.c | 56 ++++++++++++++++++++++--------
 include/linux/io-pgtable.h         | 15 +++++---
 2 files changed, 52 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index be066c1503d3..57455ae052ac 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -149,6 +149,10 @@
 #define ARM_V7S_TTBR_IRGN_ATTR(attr)					\
 	((((attr) & 0x1) << 6) | (((attr) & 0x2) >> 1))
 
+/* Mediatek extend ttbr bits[2:0] for PA bits[34:32] */
+#define ARM_V7S_TTBR_35BIT_PA(ttbr, pa)					\
+	((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
+
 #ifdef CONFIG_ZONE_DMA32
 #define ARM_V7S_TABLE_GFP_DMA GFP_DMA32
 #define ARM_V7S_TABLE_SLAB_FLAGS SLAB_CACHE_DMA32
@@ -182,14 +186,8 @@ static bool arm_v7s_is_mtk_enabled(struct io_pgtable_cfg *cfg)
 		(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT);
 }
 
-static arm_v7s_iopte paddr_to_iopte(phys_addr_t paddr, int lvl,
-				    struct io_pgtable_cfg *cfg)
+static arm_v7s_iopte to_iopte_mtk(phys_addr_t paddr, arm_v7s_iopte pte)
 {
-	arm_v7s_iopte pte = paddr & ARM_V7S_LVL_MASK(lvl);
-
-	if (!arm_v7s_is_mtk_enabled(cfg))
-		return pte;
-
 	if (paddr & BIT_ULL(32))
 		pte |= ARM_V7S_ATTR_MTK_PA_BIT32;
 	if (paddr & BIT_ULL(33))
@@ -199,6 +197,17 @@ static arm_v7s_iopte paddr_to_iopte(phys_addr_t paddr, int lvl,
 	return pte;
 }
 
+static arm_v7s_iopte paddr_to_iopte(phys_addr_t paddr, int lvl,
+				    struct io_pgtable_cfg *cfg)
+{
+	arm_v7s_iopte pte = paddr & ARM_V7S_LVL_MASK(lvl);
+
+	if (!arm_v7s_is_mtk_enabled(cfg))
+		return pte;
+
+	return to_iopte_mtk(paddr, pte);
+}
+
 static phys_addr_t iopte_to_paddr(arm_v7s_iopte pte, int lvl,
 				  struct io_pgtable_cfg *cfg)
 {
@@ -234,6 +243,7 @@ static arm_v7s_iopte *iopte_deref(arm_v7s_iopte pte, int lvl,
 static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
 				   struct arm_v7s_io_pgtable *data)
 {
+	gfp_t gfp_l1 = __GFP_ZERO | ARM_V7S_TABLE_GFP_DMA;
 	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 	struct device *dev = cfg->iommu_dev;
 	phys_addr_t phys;
@@ -241,9 +251,11 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
 	size_t size = ARM_V7S_TABLE_SIZE(lvl, cfg);
 	void *table = NULL;
 
+	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
+		gfp_l1 = __GFP_ZERO;
+
 	if (lvl == 1)
-		table = (void *)__get_free_pages(
-			__GFP_ZERO | ARM_V7S_TABLE_GFP_DMA, get_order(size));
+		table = (void *)__get_free_pages(gfp_l1, get_order(size));
 	else if (lvl == 2)
 		table = kmem_cache_zalloc(data->l2_tables, gfp);
 
@@ -251,7 +263,8 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
 		return NULL;
 
 	phys = virt_to_phys(table);
-	if (phys != (arm_v7s_iopte)phys) {
+	if (phys != (arm_v7s_iopte)phys &&
+	    !(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)) {
 		/* Doesn't fit in PTE */
 		dev_err(dev, "Page table does not fit in PTE: %pa", &phys);
 		goto out_free;
@@ -457,9 +470,14 @@ static arm_v7s_iopte arm_v7s_install_table(arm_v7s_iopte *table,
 					   arm_v7s_iopte curr,
 					   struct io_pgtable_cfg *cfg)
 {
+	phys_addr_t phys = virt_to_phys(table);
 	arm_v7s_iopte old, new;
 
-	new = virt_to_phys(table) | ARM_V7S_PTE_TYPE_TABLE;
+	new = phys | ARM_V7S_PTE_TYPE_TABLE;
+
+	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
+		new = to_iopte_mtk(phys, new);
+
 	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
 		new |= ARM_V7S_ATTR_NS_TABLE;
 
@@ -778,7 +796,9 @@ static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
 static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 						void *cookie)
 {
+	slab_flags_t slab_flag = ARM_V7S_TABLE_SLAB_FLAGS;
 	struct arm_v7s_io_pgtable *data;
+	phys_addr_t paddr;
 
 	if (cfg->ias > (arm_v7s_is_mtk_enabled(cfg) ? 34 : ARM_V7S_ADDR_BITS))
 		return NULL;
@@ -788,7 +808,8 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 
 	if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
 			    IO_PGTABLE_QUIRK_NO_PERMS |
-			    IO_PGTABLE_QUIRK_ARM_MTK_EXT))
+			    IO_PGTABLE_QUIRK_ARM_MTK_EXT |
+			    IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT))
 		return NULL;
 
 	/* If ARM_MTK_4GB is enabled, the NO_PERMS is also expected. */
@@ -801,10 +822,12 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 		return NULL;
 
 	spin_lock_init(&data->split_lock);
+	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
+		slab_flag = 0;
 	data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2",
 					    ARM_V7S_TABLE_SIZE(2, cfg),
 					    ARM_V7S_TABLE_SIZE(2, cfg),
-					    ARM_V7S_TABLE_SLAB_FLAGS, NULL);
+					    slab_flag, NULL);
 	if (!data->l2_tables)
 		goto out_free_data;
 
@@ -850,12 +873,17 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 	wmb();
 
 	/* TTBR */
-	cfg->arm_v7s_cfg.ttbr = virt_to_phys(data->pgd) | ARM_V7S_TTBR_S |
+	paddr = virt_to_phys(data->pgd);
+	cfg->arm_v7s_cfg.ttbr = paddr | ARM_V7S_TTBR_S |
 				(cfg->coherent_walk ? (ARM_V7S_TTBR_NOS |
 				 ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
 				 ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) :
 				(ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) |
 				 ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC)));
+
+	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
+		cfg->arm_v7s_cfg.ttbr =
+			ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
 	return &data->iop;
 
 out_free_data:
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 86af6f0a00a2..7ed15ad4710c 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -74,17 +74,22 @@ struct io_pgtable_cfg {
 	 *	to support up to 35 bits PA where the bit32, bit33 and bit34 are
 	 *	encoded in the bit9, bit4 and bit5 of the PTE respectively.
 	 *
+	 * IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT: (ARM v7s format) MediaTek IOMMUs
+	 *	extend the translation table support up to 35 bits PA, the
+	 *	encoding format is same with IO_PGTABLE_QUIRK_ARM_MTK_EXT.
+	 *
 	 * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
 	 *	for use in the upper half of a split address space.
 	 *
 	 * IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability
 	 *	attributes set in the TCR for a non-coherent page-table walker.
 	 */
-	#define IO_PGTABLE_QUIRK_ARM_NS		BIT(0)
-	#define IO_PGTABLE_QUIRK_NO_PERMS	BIT(1)
-	#define IO_PGTABLE_QUIRK_ARM_MTK_EXT	BIT(3)
-	#define IO_PGTABLE_QUIRK_ARM_TTBR1	BIT(5)
-	#define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA	BIT(6)
+	#define IO_PGTABLE_QUIRK_ARM_NS			BIT(0)
+	#define IO_PGTABLE_QUIRK_NO_PERMS		BIT(1)
+	#define IO_PGTABLE_QUIRK_ARM_MTK_EXT		BIT(3)
+	#define IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT	BIT(4)
+	#define IO_PGTABLE_QUIRK_ARM_TTBR1		BIT(5)
+	#define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA		BIT(6)
 	unsigned long			quirks;
 	unsigned long			pgsize_bitmap;
 	unsigned int			ias;
-- 
2.18.0

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Re: [PATCH v3 1/2] iommu/io-pgtable-arm-v7s: Add a quirk to allow pgtable PA up to 35bit

[kernel test robot]

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on arm-perf/for-next/perf]
[also build test WARNING on linus/master v5.18-rc6 next-20220512]
[cannot apply to joro-iommu/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/yf-wang-mediatek-com/iommu-io-pgtable-arm-v7s-Add-a-quirk-to-allow-pgtable-PA-up-to-35bit/20220512-234603
base:   https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git for-next/perf
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20220513/202205131016.Ati0kpNR-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9519dacab7b8afd537811fc2abaceb4d14f4e16a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/916a5fc41cbb8ddfe343193598f250d06b09e3fa
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review yf-wang-mediatek-com/iommu-io-pgtable-arm-v7s-Add-a-quirk-to-allow-pgtable-PA-up-to-35bit/20220512-234603
        git checkout 916a5fc41cbb8ddfe343193598f250d06b09e3fa
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/iommu/ drivers/rtc/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/iommu/io-pgtable-arm-v7s.c:886:4: warning: shift count >= width of type [-Wshift-count-overflow]
                           ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:154:39: note: expanded from macro 'ARM_V7S_TTBR_35BIT_PA'
           ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
                                                ^~~~~~~~~~~~~~~
   include/linux/bits.h:38:31: note: expanded from macro 'GENMASK'
           (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
                                        ^~~~~~~~~~~~~~~
   include/linux/bits.h:35:22: note: expanded from macro '__GENMASK'
           (((~UL(0)) - (UL(1) << (l)) + 1) & \
                               ^  ~~~
>> drivers/iommu/io-pgtable-arm-v7s.c:886:4: warning: shift count is negative [-Wshift-count-negative]
                           ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:154:39: note: expanded from macro 'ARM_V7S_TTBR_35BIT_PA'
           ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
                                                ^~~~~~~~~~~~~~~
   include/linux/bits.h:38:31: note: expanded from macro 'GENMASK'
           (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
                                        ^~~~~~~~~~~~~~~
   include/linux/bits.h:36:11: note: expanded from macro '__GENMASK'
            (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
                    ^  ~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/iommu/io-pgtable-arm-v7s.c:886:4: warning: shift count >= width of type [-Wshift-count-overflow]
                           ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:154:56: note: expanded from macro 'ARM_V7S_TTBR_35BIT_PA'
           ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
                                                                 ^  ~~
   3 warnings generated.


vim +886 drivers/iommu/io-pgtable-arm-v7s.c

   795	
   796	static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
   797							void *cookie)
   798	{
   799		slab_flags_t slab_flag = ARM_V7S_TABLE_SLAB_FLAGS;
   800		struct arm_v7s_io_pgtable *data;
   801		phys_addr_t paddr;
   802	
   803		if (cfg->ias > (arm_v7s_is_mtk_enabled(cfg) ? 34 : ARM_V7S_ADDR_BITS))
   804			return NULL;
   805	
   806		if (cfg->oas > (arm_v7s_is_mtk_enabled(cfg) ? 35 : ARM_V7S_ADDR_BITS))
   807			return NULL;
   808	
   809		if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
   810				    IO_PGTABLE_QUIRK_NO_PERMS |
   811				    IO_PGTABLE_QUIRK_ARM_MTK_EXT |
   812				    IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT))
   813			return NULL;
   814	
   815		/* If ARM_MTK_4GB is enabled, the NO_PERMS is also expected. */
   816		if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT &&
   817		    !(cfg->quirks & IO_PGTABLE_QUIRK_NO_PERMS))
   818				return NULL;
   819	
   820		data = kmalloc(sizeof(*data), GFP_KERNEL);
   821		if (!data)
   822			return NULL;
   823	
   824		spin_lock_init(&data->split_lock);
   825		if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
   826			slab_flag = 0;
   827		data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2",
   828						    ARM_V7S_TABLE_SIZE(2, cfg),
   829						    ARM_V7S_TABLE_SIZE(2, cfg),
   830						    slab_flag, NULL);
   831		if (!data->l2_tables)
   832			goto out_free_data;
   833	
   834		data->iop.ops = (struct io_pgtable_ops) {
   835			.map		= arm_v7s_map,
   836			.map_pages	= arm_v7s_map_pages,
   837			.unmap		= arm_v7s_unmap,
   838			.unmap_pages	= arm_v7s_unmap_pages,
   839			.iova_to_phys	= arm_v7s_iova_to_phys,
   840		};
   841	
   842		/* We have to do this early for __arm_v7s_alloc_table to work... */
   843		data->iop.cfg = *cfg;
   844	
   845		/*
   846		 * Unless the IOMMU driver indicates supersection support by
   847		 * having SZ_16M set in the initial bitmap, they won't be used.
   848		 */
   849		cfg->pgsize_bitmap &= SZ_4K | SZ_64K | SZ_1M | SZ_16M;
   850	
   851		/* TCR: T0SZ=0, EAE=0 (if applicable) */
   852		cfg->arm_v7s_cfg.tcr = 0;
   853	
   854		/*
   855		 * TEX remap: the indices used map to the closest equivalent types
   856		 * under the non-TEX-remap interpretation of those attribute bits,
   857		 * excepting various implementation-defined aspects of shareability.
   858		 */
   859		cfg->arm_v7s_cfg.prrr = ARM_V7S_PRRR_TR(1, ARM_V7S_PRRR_TYPE_DEVICE) |
   860					ARM_V7S_PRRR_TR(4, ARM_V7S_PRRR_TYPE_NORMAL) |
   861					ARM_V7S_PRRR_TR(7, ARM_V7S_PRRR_TYPE_NORMAL) |
   862					ARM_V7S_PRRR_DS0 | ARM_V7S_PRRR_DS1 |
   863					ARM_V7S_PRRR_NS1 | ARM_V7S_PRRR_NOS(7);
   864		cfg->arm_v7s_cfg.nmrr = ARM_V7S_NMRR_IR(7, ARM_V7S_RGN_WBWA) |
   865					ARM_V7S_NMRR_OR(7, ARM_V7S_RGN_WBWA);
   866	
   867		/* Looking good; allocate a pgd */
   868		data->pgd = __arm_v7s_alloc_table(1, GFP_KERNEL, data);
   869		if (!data->pgd)
   870			goto out_free_data;
   871	
   872		/* Ensure the empty pgd is visible before any actual TTBR write */
   873		wmb();
   874	
   875		/* TTBR */
   876		paddr = virt_to_phys(data->pgd);
   877		cfg->arm_v7s_cfg.ttbr = paddr | ARM_V7S_TTBR_S |
   878					(cfg->coherent_walk ? (ARM_V7S_TTBR_NOS |
   879					 ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
   880					 ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) :
   881					(ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) |
   882					 ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC)));
   883	
   884		if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT)
   885			cfg->arm_v7s_cfg.ttbr =
 > 886				ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
   887		return &data->iop;
   888	
   889	out_free_data:
   890		kmem_cache_destroy(data->l2_tables);
   891		kfree(data);
   892		return NULL;
   893	}
   894	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp
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Re: [PATCH v3 1/2] iommu/io-pgtable-arm-v7s: Add a quirk to allow pgtable PA up to 35bit

[kernel test robot]

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on arm-perf/for-next/perf]
[also build test WARNING on linus/master v5.18-rc6]
[cannot apply to joro-iommu/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/yf-wang-mediatek-com/iommu-io-pgtable-arm-v7s-Add-a-quirk-to-allow-pgtable-PA-up-to-35bit/20220512-234603
base:   https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git for-next/perf
config: arm-qcom_defconfig (https://download.01.org/0day-ci/archive/20220513/202205131021.3GskEbg2-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/916a5fc41cbb8ddfe343193598f250d06b09e3fa
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review yf-wang-mediatek-com/iommu-io-pgtable-arm-v7s-Add-a-quirk-to-allow-pgtable-PA-up-to-35bit/20220512-234603
        git checkout 916a5fc41cbb8ddfe343193598f250d06b09e3fa
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iommu/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/ratelimit_types.h:5,
                    from include/linux/ratelimit.h:5,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from include/linux/dma-mapping.h:7,
                    from drivers/iommu/io-pgtable-arm-v7s.c:25:
   drivers/iommu/io-pgtable-arm-v7s.c: In function 'arm_v7s_alloc_pgtable':
   include/linux/bits.h:35:29: warning: left shift count >= width of type [-Wshift-count-overflow]
      35 |         (((~UL(0)) - (UL(1) << (l)) + 1) & \
         |                             ^~
   include/linux/bits.h:38:38: note: in expansion of macro '__GENMASK'
      38 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
         |                                      ^~~~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:154:46: note: in expansion of macro 'GENMASK'
     154 |         ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
         |                                              ^~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:886:25: note: in expansion of macro 'ARM_V7S_TTBR_35BIT_PA'
     886 |                         ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
         |                         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/bits.h:36:18: warning: right shift count is negative [-Wshift-count-negative]
      36 |          (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
         |                  ^~
   include/linux/bits.h:38:38: note: in expansion of macro '__GENMASK'
      38 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
         |                                      ^~~~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:154:46: note: in expansion of macro 'GENMASK'
     154 |         ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
         |                                              ^~~~~~~
   drivers/iommu/io-pgtable-arm-v7s.c:886:25: note: in expansion of macro 'ARM_V7S_TTBR_35BIT_PA'
     886 |                         ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
         |                         ^~~~~~~~~~~~~~~~~~~~~
>> drivers/iommu/io-pgtable-arm-v7s.c:154:63: warning: right shift count >= width of type [-Wshift-count-overflow]
     154 |         ((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
         |                                                               ^~
   drivers/iommu/io-pgtable-arm-v7s.c:886:25: note: in expansion of macro 'ARM_V7S_TTBR_35BIT_PA'
     886 |                         ARM_V7S_TTBR_35BIT_PA(cfg->arm_v7s_cfg.ttbr, paddr);
         |                         ^~~~~~~~~~~~~~~~~~~~~


vim +154 drivers/iommu/io-pgtable-arm-v7s.c

   145	
   146	#define ARM_V7S_TTBR_S			BIT(1)
   147	#define ARM_V7S_TTBR_NOS		BIT(5)
   148	#define ARM_V7S_TTBR_ORGN_ATTR(attr)	(((attr) & 0x3) << 3)
   149	#define ARM_V7S_TTBR_IRGN_ATTR(attr)					\
   150		((((attr) & 0x1) << 6) | (((attr) & 0x2) >> 1))
   151	
   152	/* Mediatek extend ttbr bits[2:0] for PA bits[34:32] */
   153	#define ARM_V7S_TTBR_35BIT_PA(ttbr, pa)					\
 > 154		((ttbr & ((u32)(~0U << 3))) | ((pa & GENMASK(34, 32)) >> 32))
   155	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp
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[PATCH v3 2/2] iomm/mediatek: Allow page table PA up to 35bit

[yf.wang--- via iommu]

From: Yunfei Wang <yf.wang@mediatek.com>

Add the quirk IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT support, so that allows
page table PA up to 35bit, not only in ZONE_DMA32.

Signed-off-by: Ning Li <ning.li@mediatek.com>
Signed-off-by: Yunfei Wang <yf.wang@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 6fd75a60abd6..1b9a876ef271 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -33,6 +33,7 @@
 
 #define REG_MMU_PT_BASE_ADDR			0x000
 #define MMU_PT_ADDR_MASK			GENMASK(31, 7)
+#define MMU_PT_ADDR_2_0_MASK			GENMASK(2, 0)
 
 #define REG_MMU_INVALIDATE			0x020
 #define F_ALL_INVLD				0x2
@@ -118,6 +119,7 @@
 #define WR_THROT_EN			BIT(6)
 #define HAS_LEGACY_IVRP_PADDR		BIT(7)
 #define IOVA_34_EN			BIT(8)
+#define PGTABLE_PA_35_EN		BIT(9)
 
 #define MTK_IOMMU_HAS_FLAG(pdata, _x) \
 		((((pdata)->flags) & (_x)) == (_x))
@@ -401,6 +403,9 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 		.iommu_dev = data->dev,
 	};
 
+	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
+		dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT;
+
 	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
 		dom->cfg.oas = data->enable_4GB ? 33 : 32;
 	else
@@ -450,6 +455,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 	struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 	struct device *m4udev = data->dev;
 	int ret, domid;
+	u32 regval;
 
 	domid = mtk_iommu_get_domain_id(dev, data->plat_data);
 	if (domid < 0)
@@ -472,8 +478,14 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 			return ret;
 		}
 		data->m4u_dom = dom;
-		writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
-		       data->base + REG_MMU_PT_BASE_ADDR);
+
+		/* Bits[6:3] are invalid for mediatek platform */
+		if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
+			regval = (dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK) |
+				 (dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_2_0_MASK);
+		else
+			regval = dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK;
+		writel(regval, data->base + REG_MMU_PT_BASE_ADDR);
 
 		pm_runtime_put(m4udev);
 	}
@@ -987,6 +999,7 @@ static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
 	struct mtk_iommu_suspend_reg *reg = &data->reg;
 	struct mtk_iommu_domain *m4u_dom = data->m4u_dom;
 	void __iomem *base = data->base;
+	u32 regval;
 	int ret;
 
 	ret = clk_prepare_enable(data->bclk);
@@ -1010,7 +1023,14 @@ static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
 	writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
 	writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
 	writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG);
-	writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, base + REG_MMU_PT_BASE_ADDR);
+
+	/* Bits[6:3] are invalid for mediatek platform */
+	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
+		regval = (m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK) |
+			 (m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_2_0_MASK);
+	else
+		regval = m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK;
+	writel(regval, base + REG_MMU_PT_BASE_ADDR);
 
 	/*
 	 * Users may allocate dma buffer before they call pm_runtime_get,
@@ -1038,7 +1058,8 @@ static const struct mtk_iommu_plat_data mt2712_data = {
 
 static const struct mtk_iommu_plat_data mt6779_data = {
 	.m4u_plat      = M4U_MT6779,
-	.flags         = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN,
+	.flags         = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN |
+			 PGTABLE_PA_35_EN,
 	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
 	.iova_region   = single_domain,
 	.iova_region_nr = ARRAY_SIZE(single_domain),
-- 
2.18.0

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