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uacce: Remove mm_exit() op

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The mm_exit() op will be removed from the SVA API. When a process dies
and its mm goes away, the IOMMU driver won't notify device drivers
anymore. Drivers should expect to handle a lot more aborted DMA. On the
upside, it does greatly simplify the queue management.

The uacce_mm struct, that tracks all queues bound to an mm, was only
used by the mm_exit() callback. Remove it.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Link: https://lore.kernel.org/r/20200423125329.782066-2-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jean-Philippe Brucker 2020-04-23 14:53:28 +02:00 • committed by Joerg Roedel
parent da656a0425
commit fb01562e5a
2 changed files with 53 additions and 157 deletions
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34
include/linux/uacce.h
View file

@ -68,19 +68,21 @@ enum uacce_q_state {
* @uacce: pointer to uacce
* @priv: private pointer
* @wait: wait queue head
* @list: index into uacce_mm
* @uacce_mm: the corresponding mm
* @list: index into uacce queues list
* @qfrs: pointer of qfr regions
* @state: queue state machine
* @pasid: pasid associated to the mm
* @handle: iommu_sva handle returned by iommu_sva_bind_device()
*/
struct uacce_queue {
struct uacce_device *uacce;
void *priv;
wait_queue_head_t wait;
struct list_head list;
struct uacce_mm *uacce_mm;
struct uacce_qfile_region *qfrs[UACCE_MAX_REGION];
enum uacce_q_state state;
int pasid;
struct iommu_sva *handle;
};
/**
@ -96,8 +98,8 @@ struct uacce_queue {
* @cdev: cdev of the uacce
* @dev: dev of the uacce
* @priv: private pointer of the uacce
* @mm_list: list head of uacce_mm->list
* @mm_lock: lock for mm_list
* @queues: list of queues
* @queues_lock: lock for queues list
* @inode: core vfs
*/
struct uacce_device {
@ -112,27 +114,9 @@ struct uacce_device {
struct cdev *cdev;
struct device dev;
void *priv;
struct list_head mm_list;
struct mutex mm_lock;
struct inode *inode;
};
/**
* struct uacce_mm - keep track of queues bound to a process
* @list: index into uacce_device
* @queues: list of queues
* @mm: the mm struct
* @lock: protects the list of queues
* @pasid: pasid of the uacce_mm
* @handle: iommu_sva handle return from iommu_sva_bind_device
*/
struct uacce_mm {
struct list_head list;
struct list_head queues;
struct mm_struct *mm;
struct mutex lock;
int pasid;
struct iommu_sva *handle;
struct mutex queues_lock;
struct inode *inode;
};
#if IS_ENABLED(CONFIG_UACCE)