From: Nicolin Chen <nicolinc@nvidia.com> To: <will@kernel.org>, <robin.murphy@arm.com>, <jgg@nvidia.com>, <kevin.tian@intel.com>, <suravee.suthikulpanit@amd.com> Cc: <joro@8bytes.org>, <linux-kernel@vger.kernel.org>, <iommu@lists.linux.dev>, <linux-arm-kernel@lists.infradead.org>, <linux-tegra@vger.kernel.org>, <yi.l.liu@intel.com>, <eric.auger@redhat.com>, <vasant.hegde@amd.com>, <jon.grimm@amd.com>, <santosh.shukla@amd.com>, <Dhaval.Giani@amd.com>, <shameerali.kolothum.thodi@huawei.com> Subject: [PATCH RFCv1 13/14] iommufd: Add mmap infrastructure Date: Fri, 12 Apr 2024 20:47:10 -0700 [thread overview] Message-ID: <6fef9ff9944381d51dd18f83ec03785a26754dcf.1712978213.git.nicolinc@nvidia.com> (raw) In-Reply-To: <cover.1712978212.git.nicolinc@nvidia.com> Add for sharing the kernel page with user space. This allows to pass through HW resource (VCMDQ MMIO pages for example) to user space VMM and guest OS. Use vma->vm_pgoff as the carrier of a viommu_id. Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- drivers/iommu/iommufd/main.c | 40 ++++++++++++++++++++++++++++++++++++ include/linux/iommufd.h | 4 ++++ 2 files changed, 44 insertions(+) diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 96ef81530809..5b401c80cca8 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -16,6 +16,7 @@ #include <linux/mutex.h> #include <linux/bug.h> #include <uapi/linux/iommufd.h> +#include <linux/iommu.h> #include <linux/iommufd.h> #include "io_pagetable.h" @@ -427,11 +428,50 @@ static long iommufd_fops_ioctl(struct file *filp, unsigned int cmd, return ret; } +static int iommufd_fops_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct iommufd_ctx *ictx = filp->private_data; + size_t size = vma->vm_end - vma->vm_start; + u32 viommu_id = (u32)vma->vm_pgoff; + struct iommufd_viommu *viommu; + unsigned long pfn; + int rc; + + if (size > PAGE_SIZE) + return -EINVAL; + + viommu = container_of(iommufd_get_object(ictx, viommu_id, + IOMMUFD_OBJ_VIOMMU), + struct iommufd_viommu, obj); + if (IS_ERR(viommu)) + return PTR_ERR(viommu); + + if (!viommu->ops->get_mmap_pfn) { + rc = -EOPNOTSUPP; + goto out_put_viommu; + } + + pfn = viommu->ops->get_mmap_pfn(viommu, size); + if (!pfn) { + rc = -ENOMEM; + goto out_put_viommu; + } + + vma->vm_pgoff = 0; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); + rc = remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot); +out_put_viommu: + iommufd_put_object(ictx, &viommu->obj); + return rc; +} + static const struct file_operations iommufd_fops = { .owner = THIS_MODULE, .open = iommufd_fops_open, .release = iommufd_fops_release, .unlocked_ioctl = iommufd_fops_ioctl, + .mmap = iommufd_fops_mmap, }; /** diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 707b6d4b20a3..4a9c6b281d35 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -104,6 +104,8 @@ struct iommufd_viommu { * the include/uapi/linux/iommufd.h header. * @vqueue_free: Free all driver-specific parts of an iommufd_vqueue. The memory * of the iommufd_vqueue will be free-ed by iommufd core + * @get_mmap_pfn: Return the PFN of a viommu given a finite size, for user space + * to mmap the page(s). */ struct iommufd_viommu_ops { void (*free)(struct iommufd_viommu *viommu); @@ -114,6 +116,8 @@ struct iommufd_viommu_ops { struct iommufd_viommu *viommu, const struct iommu_user_data *user_data); void (*vqueue_free)(struct iommufd_vqueue *vqueue); + unsigned long (*get_mmap_pfn)(struct iommufd_viommu *viommu, + size_t pgsize); }; struct iommufd_vqueue { -- 2.43.0
WARNING: multiple messages have this Message-ID (diff)
From: Nicolin Chen <nicolinc@nvidia.com> To: <will@kernel.org>, <robin.murphy@arm.com>, <jgg@nvidia.com>, <kevin.tian@intel.com>, <suravee.suthikulpanit@amd.com> Cc: <joro@8bytes.org>, <linux-kernel@vger.kernel.org>, <iommu@lists.linux.dev>, <linux-arm-kernel@lists.infradead.org>, <linux-tegra@vger.kernel.org>, <yi.l.liu@intel.com>, <eric.auger@redhat.com>, <vasant.hegde@amd.com>, <jon.grimm@amd.com>, <santosh.shukla@amd.com>, <Dhaval.Giani@amd.com>, <shameerali.kolothum.thodi@huawei.com> Subject: [PATCH RFCv1 13/14] iommufd: Add mmap infrastructure Date: Fri, 12 Apr 2024 20:47:10 -0700 [thread overview] Message-ID: <6fef9ff9944381d51dd18f83ec03785a26754dcf.1712978213.git.nicolinc@nvidia.com> (raw) In-Reply-To: <cover.1712978212.git.nicolinc@nvidia.com> Add for sharing the kernel page with user space. This allows to pass through HW resource (VCMDQ MMIO pages for example) to user space VMM and guest OS. Use vma->vm_pgoff as the carrier of a viommu_id. Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- drivers/iommu/iommufd/main.c | 40 ++++++++++++++++++++++++++++++++++++ include/linux/iommufd.h | 4 ++++ 2 files changed, 44 insertions(+) diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 96ef81530809..5b401c80cca8 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -16,6 +16,7 @@ #include <linux/mutex.h> #include <linux/bug.h> #include <uapi/linux/iommufd.h> +#include <linux/iommu.h> #include <linux/iommufd.h> #include "io_pagetable.h" @@ -427,11 +428,50 @@ static long iommufd_fops_ioctl(struct file *filp, unsigned int cmd, return ret; } +static int iommufd_fops_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct iommufd_ctx *ictx = filp->private_data; + size_t size = vma->vm_end - vma->vm_start; + u32 viommu_id = (u32)vma->vm_pgoff; + struct iommufd_viommu *viommu; + unsigned long pfn; + int rc; + + if (size > PAGE_SIZE) + return -EINVAL; + + viommu = container_of(iommufd_get_object(ictx, viommu_id, + IOMMUFD_OBJ_VIOMMU), + struct iommufd_viommu, obj); + if (IS_ERR(viommu)) + return PTR_ERR(viommu); + + if (!viommu->ops->get_mmap_pfn) { + rc = -EOPNOTSUPP; + goto out_put_viommu; + } + + pfn = viommu->ops->get_mmap_pfn(viommu, size); + if (!pfn) { + rc = -ENOMEM; + goto out_put_viommu; + } + + vma->vm_pgoff = 0; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); + rc = remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot); +out_put_viommu: + iommufd_put_object(ictx, &viommu->obj); + return rc; +} + static const struct file_operations iommufd_fops = { .owner = THIS_MODULE, .open = iommufd_fops_open, .release = iommufd_fops_release, .unlocked_ioctl = iommufd_fops_ioctl, + .mmap = iommufd_fops_mmap, }; /** diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 707b6d4b20a3..4a9c6b281d35 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -104,6 +104,8 @@ struct iommufd_viommu { * the include/uapi/linux/iommufd.h header. * @vqueue_free: Free all driver-specific parts of an iommufd_vqueue. The memory * of the iommufd_vqueue will be free-ed by iommufd core + * @get_mmap_pfn: Return the PFN of a viommu given a finite size, for user space + * to mmap the page(s). */ struct iommufd_viommu_ops { void (*free)(struct iommufd_viommu *viommu); @@ -114,6 +116,8 @@ struct iommufd_viommu_ops { struct iommufd_viommu *viommu, const struct iommu_user_data *user_data); void (*vqueue_free)(struct iommufd_vqueue *vqueue); + unsigned long (*get_mmap_pfn)(struct iommufd_viommu *viommu, + size_t pgsize); }; struct iommufd_vqueue { -- 2.43.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2024-04-13 3:48 UTC|newest] Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-13 3:46 [PATCH RFCv1 00/14] Add Tegra241 (Grace) CMDQV Support (part 2/2) Nicolin Chen 2024-04-13 3:46 ` Nicolin Chen 2024-04-13 3:46 ` [PATCH RFCv1 01/14] iommufd: Move iommufd_object to public iommufd header Nicolin Chen 2024-04-13 3:46 ` Nicolin Chen 2024-05-12 13:21 ` Jason Gunthorpe 2024-05-12 13:21 ` Jason Gunthorpe 2024-05-12 22:40 ` Nicolin Chen 2024-05-12 22:40 ` Nicolin Chen 2024-05-13 22:30 ` Jason Gunthorpe 2024-05-13 22:30 ` Jason Gunthorpe 2024-04-13 3:46 ` [PATCH RFCv1 02/14] iommufd: Swap _iommufd_object_alloc and __iommufd_object_alloc Nicolin Chen 2024-04-13 3:46 ` Nicolin Chen 2024-05-12 13:26 ` Jason Gunthorpe 2024-05-12 13:26 ` Jason Gunthorpe 2024-05-13 2:29 ` Nicolin Chen 2024-05-13 2:29 ` Nicolin Chen 2024-05-13 3:44 ` Nicolin Chen 2024-05-13 3:44 ` Nicolin Chen 2024-05-13 22:30 ` Jason Gunthorpe 2024-05-13 22:30 ` Jason Gunthorpe 2024-04-13 3:47 ` [PATCH RFCv1 03/14] iommufd: Prepare for viommu structures and functions Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 13:42 ` Jason Gunthorpe 2024-05-12 13:42 ` Jason Gunthorpe 2024-05-13 2:35 ` Nicolin Chen 2024-05-13 2:35 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 04/14] iommufd: Add struct iommufd_viommu and iommufd_viommu_ops Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 14:03 ` Jason Gunthorpe 2024-05-12 14:03 ` Jason Gunthorpe 2024-05-13 3:34 ` Nicolin Chen 2024-05-13 3:34 ` Nicolin Chen 2024-05-14 15:55 ` Jason Gunthorpe 2024-05-14 15:55 ` Jason Gunthorpe 2024-04-13 3:47 ` [PATCH RFCv1 05/14] iommufd: Add IOMMUFD_OBJ_VIOMMU and IOMMUFD_CMD_VIOMMU_ALLOC Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 14:27 ` Jason Gunthorpe 2024-05-12 14:27 ` Jason Gunthorpe 2024-05-13 4:33 ` Nicolin Chen 2024-05-13 4:33 ` Nicolin Chen 2024-05-14 15:38 ` Jason Gunthorpe 2024-05-14 15:38 ` Jason Gunthorpe 2024-05-15 1:20 ` Nicolin Chen 2024-05-15 1:20 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 06/14] iommufd/selftest: Add IOMMU_VIOMMU_ALLOC test coverage Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 07/14] iommufd: Add viommu set/unset_dev_id ops Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 14:46 ` Jason Gunthorpe 2024-05-12 14:46 ` Jason Gunthorpe 2024-05-13 4:39 ` Nicolin Chen 2024-05-13 4:39 ` Nicolin Chen 2024-05-14 15:53 ` Jason Gunthorpe 2024-05-14 15:53 ` Jason Gunthorpe 2024-05-15 1:59 ` Nicolin Chen 2024-05-15 1:59 ` Nicolin Chen 2024-05-12 14:51 ` Jason Gunthorpe 2024-05-12 14:51 ` Jason Gunthorpe 2024-04-13 3:47 ` [PATCH RFCv1 08/14] iommufd: Add IOMMU_VIOMMU_SET_DEV_ID ioctl Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 14:58 ` Jason Gunthorpe 2024-05-12 14:58 ` Jason Gunthorpe 2024-05-13 5:24 ` Nicolin Chen 2024-05-13 5:24 ` Nicolin Chen 2024-05-17 5:14 ` Nicolin Chen 2024-05-17 5:14 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 09/14] iommufd/selftest: Add IOMMU_VIOMMU_SET_DEV_ID test coverage Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 10/14] iommufd/selftest: Add IOMMU_TEST_OP_MV_CHECK_DEV_ID Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 11/14] iommufd: Add struct iommufd_vqueue and its related viommu ops Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 12/14] iommufd: Add IOMMUFD_OBJ_VQUEUE and IOMMUFD_CMD_VQUEUE_ALLOC Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen 2024-05-12 15:02 ` Jason Gunthorpe 2024-05-12 15:02 ` Jason Gunthorpe 2024-05-13 4:41 ` Nicolin Chen 2024-05-13 4:41 ` Nicolin Chen 2024-05-13 22:36 ` Jason Gunthorpe 2024-05-13 22:36 ` Jason Gunthorpe 2024-04-13 3:47 ` Nicolin Chen [this message] 2024-04-13 3:47 ` [PATCH RFCv1 13/14] iommufd: Add mmap infrastructure Nicolin Chen 2024-05-12 15:19 ` Jason Gunthorpe 2024-05-12 15:19 ` Jason Gunthorpe 2024-05-13 4:43 ` Nicolin Chen 2024-05-13 4:43 ` Nicolin Chen 2024-04-13 3:47 ` [PATCH RFCv1 14/14] iommu/tegra241-cmdqv: Add user-space use support Nicolin Chen 2024-04-13 3:47 ` Nicolin Chen
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