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cxl: Unmap MMIO regions when detaching a context

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If we need to force detach a context (e.g. due to EEH or simply force
unbinding the driver) we should prevent the userspace contexts from
being able to access the Problem State Area MMIO region further, which
they may have mapped with mmap().

This patch unmaps any mapped MMIO regions when detaching a userspace
context.

Cc: stable@vger.kernel.org
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ian Munsie
2014-12-08 19:18:01 +11:00
committed by Michael Ellerman
parent a98e6e9f4e
commit b123429e6a
3 changed files with 21 additions and 3 deletions
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7
drivers/misc/cxl/cxl.h
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@@ -398,6 +398,10 @@ struct cxl_context {
phys_addr_t psn_phys;
u64 psn_size;
/* Used to unmap any mmaps when force detaching */
struct address_space *mapping;
struct mutex mapping_lock;
spinlock_t sste_lock; /* Protects segment table entries */
struct cxl_sste *sstp;
u64 sstp0, sstp1;
@@ -599,7 +603,8 @@ int cxl_alloc_sst(struct cxl_context *ctx);
void init_cxl_native(void);
struct cxl_context *cxl_context_alloc(void);
int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master);
int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master,
struct address_space *mapping);
void cxl_context_free(struct cxl_context *ctx);
int cxl_context_iomap(struct cxl_context *ctx, struct vm_area_struct *vma);