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Date: Thu, 11 Jun 2020 05:15:20 -0700
From: Liu Yi L <yi.l.liu@...el.com>
To: alex.williamson@...hat.com, eric.auger@...hat.com,
baolu.lu@...ux.intel.com, joro@...tes.org
Cc: kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
ashok.raj@...el.com, yi.l.liu@...el.com, jun.j.tian@...el.com,
yi.y.sun@...el.com, jean-philippe@...aro.org, peterx@...hat.com,
hao.wu@...el.com, iommu@...ts.linux-foundation.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/15] vfio/type1: Refactor vfio_iommu_type1_ioctl()
This patch refactors the vfio_iommu_type1_ioctl() to use switch instead of
if-else, and each cmd got a helper function.
Cc: Kevin Tian <kevin.tian@...el.com>
CC: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Suggested-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
---
drivers/vfio/vfio_iommu_type1.c | 183 +++++++++++++++++++++++-----------------
1 file changed, 105 insertions(+), 78 deletions(-)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index cc1d647..402aad3 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2106,6 +2106,23 @@ static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
return ret;
}
+static int vfio_iommu_type1_check_extension(struct vfio_iommu *iommu,
+ unsigned long arg)
+{
+ switch (arg) {
+ case VFIO_TYPE1_IOMMU:
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_NESTING_IOMMU:
+ return 1;
+ case VFIO_DMA_CC_IOMMU:
+ if (!iommu)
+ return 0;
+ return vfio_domains_have_iommu_cache(iommu);
+ default:
+ return 0;
+ }
+}
+
static int vfio_iommu_iova_add_cap(struct vfio_info_cap *caps,
struct vfio_iommu_type1_info_cap_iova_range *cap_iovas,
size_t size)
@@ -2173,110 +2190,120 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu,
return ret;
}
-static long vfio_iommu_type1_ioctl(void *iommu_data,
- unsigned int cmd, unsigned long arg)
+static int vfio_iommu_type1_get_info(struct vfio_iommu *iommu,
+ unsigned long arg)
{
- struct vfio_iommu *iommu = iommu_data;
+ struct vfio_iommu_type1_info info;
unsigned long minsz;
+ struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+ unsigned long capsz;
+ int ret;
- if (cmd == VFIO_CHECK_EXTENSION) {
- switch (arg) {
- case VFIO_TYPE1_IOMMU:
- case VFIO_TYPE1v2_IOMMU:
- case VFIO_TYPE1_NESTING_IOMMU:
- return 1;
- case VFIO_DMA_CC_IOMMU:
- if (!iommu)
- return 0;
- return vfio_domains_have_iommu_cache(iommu);
- default:
- return 0;
- }
- } else if (cmd == VFIO_IOMMU_GET_INFO) {
- struct vfio_iommu_type1_info info;
- struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
- unsigned long capsz;
- int ret;
-
- minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
+ minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
- /* For backward compatibility, cannot require this */
- capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
+ /* For backward compatibility, cannot require this */
+ capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
- if (info.argsz < minsz)
- return -EINVAL;
+ if (info.argsz < minsz)
+ return -EINVAL;
- if (info.argsz >= capsz) {
- minsz = capsz;
- info.cap_offset = 0; /* output, no-recopy necessary */
- }
+ if (info.argsz >= capsz) {
+ minsz = capsz;
+ info.cap_offset = 0; /* output, no-recopy necessary */
+ }
- info.flags = VFIO_IOMMU_INFO_PGSIZES;
+ info.flags = VFIO_IOMMU_INFO_PGSIZES;
- info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
+ info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
- ret = vfio_iommu_iova_build_caps(iommu, &caps);
- if (ret)
- return ret;
+ ret = vfio_iommu_iova_build_caps(iommu, &caps);
+ if (ret)
+ return ret;
- if (caps.size) {
- info.flags |= VFIO_IOMMU_INFO_CAPS;
+ if (caps.size) {
+ info.flags |= VFIO_IOMMU_INFO_CAPS;
- if (info.argsz < sizeof(info) + caps.size) {
- info.argsz = sizeof(info) + caps.size;
- } else {
- vfio_info_cap_shift(&caps, sizeof(info));
- if (copy_to_user((void __user *)arg +
- sizeof(info), caps.buf,
- caps.size)) {
- kfree(caps.buf);
- return -EFAULT;
- }
- info.cap_offset = sizeof(info);
+ if (info.argsz < sizeof(info) + caps.size) {
+ info.argsz = sizeof(info) + caps.size;
+ } else {
+ vfio_info_cap_shift(&caps, sizeof(info));
+ if (copy_to_user((void __user *)arg +
+ sizeof(info), caps.buf,
+ caps.size)) {
+ kfree(caps.buf);
+ return -EFAULT;
}
-
- kfree(caps.buf);
+ info.cap_offset = sizeof(info);
}
- return copy_to_user((void __user *)arg, &info, minsz) ?
- -EFAULT : 0;
+ kfree(caps.buf);
+ }
- } else if (cmd == VFIO_IOMMU_MAP_DMA) {
- struct vfio_iommu_type1_dma_map map;
- uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
- VFIO_DMA_MAP_FLAG_WRITE;
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
- minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
+}
- if (copy_from_user(&map, (void __user *)arg, minsz))
- return -EFAULT;
+static int vfio_iommu_type1_map_dma(struct vfio_iommu *iommu,
+ unsigned long arg)
+{
+ struct vfio_iommu_type1_dma_map map;
+ unsigned long minsz;
+ uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
+ VFIO_DMA_MAP_FLAG_WRITE;
- if (map.argsz < minsz || map.flags & ~mask)
- return -EINVAL;
+ minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
- return vfio_dma_do_map(iommu, &map);
+ if (copy_from_user(&map, (void __user *)arg, minsz))
+ return -EFAULT;
- } else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
- struct vfio_iommu_type1_dma_unmap unmap;
- long ret;
+ if (map.argsz < minsz || map.flags & ~mask)
+ return -EINVAL;
- minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
+ return vfio_dma_do_map(iommu, &map);
+}
- if (copy_from_user(&unmap, (void __user *)arg, minsz))
- return -EFAULT;
+static int vfio_iommu_type1_unmap_dma(struct vfio_iommu *iommu,
+ unsigned long arg)
+{
+ struct vfio_iommu_type1_dma_unmap unmap;
+ unsigned long minsz;
+ long ret;
- if (unmap.argsz < minsz || unmap.flags)
- return -EINVAL;
+ minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
- ret = vfio_dma_do_unmap(iommu, &unmap);
- if (ret)
- return ret;
+ if (copy_from_user(&unmap, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (unmap.argsz < minsz || unmap.flags)
+ return -EINVAL;
+
+ ret = vfio_dma_do_unmap(iommu, &unmap);
+ if (ret)
+ return ret;
+
+ return copy_to_user((void __user *)arg, &unmap, minsz) ?
+ -EFAULT : 0;
+
+}
+
+static long vfio_iommu_type1_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_iommu *iommu = iommu_data;
- return copy_to_user((void __user *)arg, &unmap, minsz) ?
- -EFAULT : 0;
+ switch (cmd) {
+ case VFIO_CHECK_EXTENSION:
+ return vfio_iommu_type1_check_extension(iommu, arg);
+ case VFIO_IOMMU_GET_INFO:
+ return vfio_iommu_type1_get_info(iommu, arg);
+ case VFIO_IOMMU_MAP_DMA:
+ return vfio_iommu_type1_map_dma(iommu, arg);
+ case VFIO_IOMMU_UNMAP_DMA:
+ return vfio_iommu_type1_unmap_dma(iommu, arg);
}
return -ENOTTY;
--
2.7.4
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