Re: [PATCH v1 2/8] vfio/type1: Add vfio_iommu_type1 parameter for quota tuning

[kbuild test robot <lkp@intel.com>]

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Hi Yi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on vfio/next]
[also build test ERROR on v5.6-rc6 next-20200320]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Liu-Yi-L/vfio-expose-virtual-Shared-Virtual-Addressing-to-VMs/20200322-213259
base:   https://github.com/awilliam/linux-vfio.git next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=arm64 

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

All errors (new ones prefixed by >>):

   drivers/vfio/vfio.c: In function 'vfio_create_mm':
   drivers/vfio/vfio.c:2149:8: error: implicit declaration of function 'ioasid_alloc_set'; did you mean 'ioasid_alloc'? [-Werror=implicit-function-declaration]
    2149 |  ret = ioasid_alloc_set((struct ioasid_set *) mm,
         |        ^~~~~~~~~~~~~~~~
         |        ioasid_alloc
   drivers/vfio/vfio.c:2158:13: warning: assignment to 'long long unsigned int' from 'struct mm_struct *' makes integer from pointer without a cast [-Wint-conversion]
    2158 |  token->val = mm;
         |             ^
   drivers/vfio/vfio.c: In function 'vfio_mm_unlock_and_free':
   drivers/vfio/vfio.c:2170:2: error: implicit declaration of function 'ioasid_free_set'; did you mean 'ioasid_free'? [-Werror=implicit-function-declaration]
    2170 |  ioasid_free_set(vmm->ioasid_sid, true);
         |  ^~~~~~~~~~~~~~~
         |  ioasid_free
   drivers/vfio/vfio.c: In function 'vfio_mm_pasid_alloc':
>> drivers/vfio/vfio.c:2230:3: error: implicit declaration of function 'ioasid_adjust_set' [-Werror=implicit-function-declaration]
    2230 |   ioasid_adjust_set(vmm->ioasid_sid, quota);
         |   ^~~~~~~~~~~~~~~~~
   drivers/vfio/vfio.c:2233:26: warning: passing argument 1 of 'ioasid_alloc' makes pointer from integer without a cast [-Wint-conversion]
    2233 |  pasid = ioasid_alloc(vmm->ioasid_sid, min, max, NULL);
         |                       ~~~^~~~~~~~~~~~
         |                          |
         |                          int
   In file included from include/linux/iommu.h:16,
                    from drivers/vfio/vfio.c:20:
   include/linux/ioasid.h:45:56: note: expected 'struct ioasid_set *' but argument is of type 'int'
      45 | static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
         |                                     ~~~~~~~~~~~~~~~~~~~^~~
   drivers/vfio/vfio.c: In function 'vfio_mm_pasid_free':
   drivers/vfio/vfio.c:2252:25: warning: passing argument 1 of 'ioasid_find' makes pointer from integer without a cast [-Wint-conversion]
    2252 |  pdata = ioasid_find(vmm->ioasid_sid, pasid, NULL);
         |                      ~~~^~~~~~~~~~~~
         |                         |
         |                         int
   In file included from include/linux/iommu.h:16,
                    from drivers/vfio/vfio.c:20:
   include/linux/ioasid.h:55:52: note: expected 'struct ioasid_set *' but argument is of type 'int'
      55 | static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
         |                                 ~~~~~~~~~~~~~~~~~~~^~~
   cc1: some warnings being treated as errors

vim +/ioasid_adjust_set +2230 drivers/vfio/vfio.c

  2133	
  2134	/**
  2135	 * VFIO_MM objects - create, release, get, put, search
  2136	 * Caller of the function should have held vfio.vfio_mm_lock.
  2137	 */
  2138	static struct vfio_mm *vfio_create_mm(struct mm_struct *mm)
  2139	{
  2140		struct vfio_mm *vmm;
  2141		struct vfio_mm_token *token;
  2142		int ret = 0;
  2143	
  2144		vmm = kzalloc(sizeof(*vmm), GFP_KERNEL);
  2145		if (!vmm)
  2146			return ERR_PTR(-ENOMEM);
  2147	
  2148		/* Per mm IOASID set used for quota control and group operations */
  2149		ret = ioasid_alloc_set((struct ioasid_set *) mm,
  2150				       VFIO_DEFAULT_PASID_QUOTA, &vmm->ioasid_sid);
  2151		if (ret) {
  2152			kfree(vmm);
  2153			return ERR_PTR(ret);
  2154		}
  2155	
  2156		kref_init(&vmm->kref);
  2157		token = &vmm->token;
> 2158		token->val = mm;
  2159		vmm->pasid_quota = VFIO_DEFAULT_PASID_QUOTA;
  2160		mutex_init(&vmm->pasid_lock);
  2161	
  2162		list_add(&vmm->vfio_next, &vfio.vfio_mm_list);
  2163	
  2164		return vmm;
  2165	}
  2166	
  2167	static void vfio_mm_unlock_and_free(struct vfio_mm *vmm)
  2168	{
  2169		/* destroy the ioasid set */
  2170		ioasid_free_set(vmm->ioasid_sid, true);
  2171		mutex_unlock(&vfio.vfio_mm_lock);
  2172		kfree(vmm);
  2173	}
  2174	
  2175	/* called with vfio.vfio_mm_lock held */
  2176	static void vfio_mm_release(struct kref *kref)
  2177	{
  2178		struct vfio_mm *vmm = container_of(kref, struct vfio_mm, kref);
  2179	
  2180		list_del(&vmm->vfio_next);
  2181		vfio_mm_unlock_and_free(vmm);
  2182	}
  2183	
  2184	void vfio_mm_put(struct vfio_mm *vmm)
  2185	{
  2186		kref_put_mutex(&vmm->kref, vfio_mm_release, &vfio.vfio_mm_lock);
  2187	}
  2188	EXPORT_SYMBOL_GPL(vfio_mm_put);
  2189	
  2190	/* Assume vfio_mm_lock or vfio_mm reference is held */
  2191	static void vfio_mm_get(struct vfio_mm *vmm)
  2192	{
  2193		kref_get(&vmm->kref);
  2194	}
  2195	
  2196	struct vfio_mm *vfio_mm_get_from_task(struct task_struct *task)
  2197	{
  2198		struct mm_struct *mm = get_task_mm(task);
  2199		struct vfio_mm *vmm;
  2200		unsigned long long val = (unsigned long long) mm;
  2201	
  2202		mutex_lock(&vfio.vfio_mm_lock);
  2203		list_for_each_entry(vmm, &vfio.vfio_mm_list, vfio_next) {
  2204			if (vmm->token.val == val) {
  2205				vfio_mm_get(vmm);
  2206				goto out;
  2207			}
  2208		}
  2209	
  2210		vmm = vfio_create_mm(mm);
  2211		if (IS_ERR(vmm))
  2212			vmm = NULL;
  2213	out:
  2214		mutex_unlock(&vfio.vfio_mm_lock);
  2215		mmput(mm);
  2216		return vmm;
  2217	}
  2218	EXPORT_SYMBOL_GPL(vfio_mm_get_from_task);
  2219	
  2220	int vfio_mm_pasid_alloc(struct vfio_mm *vmm, int quota, int min, int max)
  2221	{
  2222		ioasid_t pasid;
  2223		int ret = -ENOSPC;
  2224	
  2225		mutex_lock(&vmm->pasid_lock);
  2226	
  2227		/* update quota as it is tunable by admin */
  2228		if (vmm->pasid_quota != quota) {
  2229			vmm->pasid_quota = quota;
> 2230			ioasid_adjust_set(vmm->ioasid_sid, quota);
  2231		}
  2232	
  2233		pasid = ioasid_alloc(vmm->ioasid_sid, min, max, NULL);
  2234		if (pasid == INVALID_IOASID) {
  2235			ret = -ENOSPC;
  2236			goto out_unlock;
  2237		}
  2238	
  2239		ret = pasid;
  2240	out_unlock:
  2241		mutex_unlock(&vmm->pasid_lock);
  2242		return ret;
  2243	}
  2244	EXPORT_SYMBOL_GPL(vfio_mm_pasid_alloc);
  2245	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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