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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/arm: ffa: separate memory sharing routines
commit 88368672003e7d97c82f01a2cc7ac87c6f6c5585
Author: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
AuthorDate: Mon Mar 25 10:39:01 2024 +0100
Commit: Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Wed Apr 3 16:10:45 2024 -0700
xen/arm: ffa: separate memory sharing routines
Move memory sharing routines into a separate file for easier navigation
in the source code.
Add ffa_shm_domain_destroy() to isolate the ffa_shm things in
ffa_domain_teardown_continue().
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
[stefano: fix date in header]
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
xen/arch/arm/tee/Makefile | 1 +
xen/arch/arm/tee/ffa.c | 708 +----------------------------------------
xen/arch/arm/tee/ffa_private.h | 10 +
xen/arch/arm/tee/ffa_shm.c | 708 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 729 insertions(+), 698 deletions(-)
diff --git a/xen/arch/arm/tee/Makefile b/xen/arch/arm/tee/Makefile
index 58a1015e40..0e683d23aa 100644
--- a/xen/arch/arm/tee/Makefile
+++ b/xen/arch/arm/tee/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_FFA) += ffa.o
+obj-$(CONFIG_FFA) += ffa_shm.o
obj-y += tee.o
obj-$(CONFIG_OPTEE) += optee.o
diff --git a/xen/arch/arm/tee/ffa.c b/xen/arch/arm/tee/ffa.c
index 259851f20b..db36292dc5 100644
--- a/xen/arch/arm/tee/ffa.c
+++ b/xen/arch/arm/tee/ffa.c
@@ -84,92 +84,6 @@ struct ffa_partition_info_1_1 {
uint8_t uuid[16];
};
-/* Constituent memory region descriptor */
-struct ffa_address_range {
- uint64_t address;
- uint32_t page_count;
- uint32_t reserved;
-};
-
-/* Composite memory region descriptor */
-struct ffa_mem_region {
- uint32_t total_page_count;
- uint32_t address_range_count;
- uint64_t reserved;
- struct ffa_address_range address_range_array[];
-};
-
-/* Memory access permissions descriptor */
-struct ffa_mem_access_perm {
- uint16_t endpoint_id;
- uint8_t perm;
- uint8_t flags;
-};
-
-/* Endpoint memory access descriptor */
-struct ffa_mem_access {
- struct ffa_mem_access_perm access_perm;
- uint32_t region_offs;
- uint64_t reserved;
-};
-
-/* Lend, donate or share memory transaction descriptor */
-struct ffa_mem_transaction_1_0 {
- uint16_t sender_id;
- uint8_t mem_reg_attr;
- uint8_t reserved0;
- uint32_t flags;
- uint64_t handle;
- uint64_t tag;
- uint32_t reserved1;
- uint32_t mem_access_count;
- struct ffa_mem_access mem_access_array[];
-};
-
-struct ffa_mem_transaction_1_1 {
- uint16_t sender_id;
- uint16_t mem_reg_attr;
- uint32_t flags;
- uint64_t handle;
- uint64_t tag;
- uint32_t mem_access_size;
- uint32_t mem_access_count;
- uint32_t mem_access_offs;
- uint8_t reserved[12];
-};
-
-/* Calculate offset of struct ffa_mem_access from start of buffer */
-#define MEM_ACCESS_OFFSET(access_idx) \
- ( sizeof(struct ffa_mem_transaction_1_1) + \
- ( access_idx ) * sizeof(struct ffa_mem_access) )
-
-/* Calculate offset of struct ffa_mem_region from start of buffer */
-#define REGION_OFFSET(access_count, region_idx) \
- ( MEM_ACCESS_OFFSET(access_count) + \
- ( region_idx ) * sizeof(struct ffa_mem_region) )
-
-/* Calculate offset of struct ffa_address_range from start of buffer */
-#define ADDR_RANGE_OFFSET(access_count, region_count, range_idx) \
- ( REGION_OFFSET(access_count, region_count) + \
- ( range_idx ) * sizeof(struct ffa_address_range) )
-
-/*
- * The parts needed from struct ffa_mem_transaction_1_0 or struct
- * ffa_mem_transaction_1_1, used to provide an abstraction of difference in
- * data structures between version 1.0 and 1.1. This is just an internal
- * interface and can be changed without changing any ABI.
- */
-struct ffa_mem_transaction_int {
- uint16_t sender_id;
- uint8_t mem_reg_attr;
- uint8_t flags;
- uint8_t mem_access_size;
- uint8_t mem_access_count;
- uint16_t mem_access_offs;
- uint64_t handle;
- uint64_t tag;
-};
-
/* Endpoint RX/TX descriptor */
struct ffa_endpoint_rxtx_descriptor_1_0 {
uint16_t sender_id;
@@ -185,15 +99,6 @@ struct ffa_endpoint_rxtx_descriptor_1_1 {
uint32_t tx_region_offs;
};
-struct ffa_shm_mem {
- struct list_head list;
- uint16_t sender_id;
- uint16_t ep_id; /* endpoint, the one lending */
- uint64_t handle; /* FFA_HANDLE_INVALID if not set yet */
- unsigned int page_count;
- struct page_info *pages[];
-};
-
/* Negotiated FF-A version to use with the SPMC */
static uint32_t __ro_after_init ffa_version;
@@ -212,10 +117,10 @@ static uint16_t subscr_vm_destroyed_count __read_mostly;
* for calls which uses our RX buffer to deliver a result we must call
* ffa_rx_release() to let the SPMC know that we're done with the buffer.
*/
-static void *ffa_rx __read_mostly;
-static void *ffa_tx __read_mostly;
-static DEFINE_SPINLOCK(ffa_rx_buffer_lock);
-static DEFINE_SPINLOCK(ffa_tx_buffer_lock);
+void *ffa_rx __read_mostly;
+void *ffa_tx __read_mostly;
+DEFINE_SPINLOCK(ffa_rx_buffer_lock);
+DEFINE_SPINLOCK(ffa_tx_buffer_lock);
/* Used to track domains that could not be torn down immediately. */
@@ -297,47 +202,6 @@ static int32_t ffa_rx_release(void)
return ffa_simple_call(FFA_RX_RELEASE, 0, 0, 0, 0);
}
-static int32_t ffa_mem_share(uint32_t tot_len, uint32_t frag_len,
- register_t addr, uint32_t pg_count,
- uint64_t *handle)
-{
- struct arm_smccc_1_2_regs arg = {
- .a0 = FFA_MEM_SHARE_64,
- .a1 = tot_len,
- .a2 = frag_len,
- .a3 = addr,
- .a4 = pg_count,
- };
- struct arm_smccc_1_2_regs resp;
-
- arm_smccc_1_2_smc(&arg, &resp);
-
- switch ( resp.a0 )
- {
- case FFA_ERROR:
- if ( resp.a2 )
- return resp.a2;
- else
- return FFA_RET_NOT_SUPPORTED;
- case FFA_SUCCESS_32:
- *handle = regpair_to_uint64(resp.a3, resp.a2);
- return FFA_RET_OK;
- case FFA_MEM_FRAG_RX:
- *handle = regpair_to_uint64(resp.a2, resp.a1);
- if ( resp.a3 > INT32_MAX ) /* Impossible value */
- return FFA_RET_ABORTED;
- return resp.a3 & INT32_MAX;
- default:
- return FFA_RET_NOT_SUPPORTED;
- }
-}
-
-static int32_t ffa_mem_reclaim(uint32_t handle_lo, uint32_t handle_hi,
- uint32_t flags)
-{
- return ffa_simple_call(FFA_MEM_RECLAIM, handle_lo, handle_hi, flags, 0);
-}
-
static int32_t ffa_direct_req_send_vm(uint16_t sp_id, uint16_t vm_id,
uint8_t msg)
{
@@ -660,506 +524,6 @@ out:
resp.a7 & mask);
}
-/*
- * Gets all page and assigns them to the supplied shared memory object. If
- * this function fails then the caller is still expected to call
- * put_shm_pages() as a cleanup.
- */
-static int get_shm_pages(struct domain *d, struct ffa_shm_mem *shm,
- const struct ffa_address_range *range,
- uint32_t range_count, unsigned int start_page_idx,
- unsigned int *last_page_idx)
-{
- unsigned int pg_idx = start_page_idx;
- gfn_t gfn;
- unsigned int n;
- unsigned int m;
- p2m_type_t t;
- uint64_t addr;
- uint64_t page_count;
-
- for ( n = 0; n < range_count; n++ )
- {
- page_count = read_atomic(&range[n].page_count);
- addr = read_atomic(&range[n].address);
- for ( m = 0; m < page_count; m++ )
- {
- if ( pg_idx >= shm->page_count )
- return FFA_RET_INVALID_PARAMETERS;
-
- gfn = gaddr_to_gfn(addr + m * FFA_PAGE_SIZE);
- shm->pages[pg_idx] = get_page_from_gfn(d, gfn_x(gfn), &t,
- P2M_ALLOC);
- if ( !shm->pages[pg_idx] )
- return FFA_RET_DENIED;
- /* Only normal RW RAM for now */
- if ( t != p2m_ram_rw )
- return FFA_RET_DENIED;
- pg_idx++;
- }
- }
-
- *last_page_idx = pg_idx;
-
- return FFA_RET_OK;
-}
-
-static void put_shm_pages(struct ffa_shm_mem *shm)
-{
- unsigned int n;
-
- for ( n = 0; n < shm->page_count && shm->pages[n]; n++ )
- {
- put_page(shm->pages[n]);
- shm->pages[n] = NULL;
- }
-}
-
-static bool inc_ctx_shm_count(struct domain *d, struct ffa_ctx *ctx)
-{
- bool ret = true;
-
- spin_lock(&ctx->lock);
-
- if ( ctx->shm_count >= FFA_MAX_SHM_COUNT )
- {
- ret = false;
- }
- else
- {
- /*
- * If this is the first shm added, increase the domain reference
- * counter as we need to keep domain around a bit longer to reclaim
- * the shared memory in the teardown path.
- */
- if ( !ctx->shm_count )
- get_knownalive_domain(d);
-
- ctx->shm_count++;
- }
-
- spin_unlock(&ctx->lock);
-
- return ret;
-}
-
-static void dec_ctx_shm_count(struct domain *d, struct ffa_ctx *ctx)
-{
- bool drop_ref;
-
- spin_lock(&ctx->lock);
-
- ASSERT(ctx->shm_count > 0);
- ctx->shm_count--;
-
- /*
- * If this was the last shm removed, let go of the domain reference we
- * took in inc_ctx_shm_count() above.
- */
- drop_ref = !ctx->shm_count;
-
- spin_unlock(&ctx->lock);
-
- if ( drop_ref )
- put_domain(d);
-}
-
-static struct ffa_shm_mem *alloc_ffa_shm_mem(struct domain *d,
- unsigned int page_count)
-{
- struct ffa_ctx *ctx = d->arch.tee;
- struct ffa_shm_mem *shm;
-
- if ( page_count >= FFA_MAX_SHM_PAGE_COUNT )
- return NULL;
- if ( !inc_ctx_shm_count(d, ctx) )
- return NULL;
-
- shm = xzalloc_flex_struct(struct ffa_shm_mem, pages, page_count);
- if ( shm )
- shm->page_count = page_count;
- else
- dec_ctx_shm_count(d, ctx);
-
- return shm;
-}
-
-static void free_ffa_shm_mem(struct domain *d, struct ffa_shm_mem *shm)
-{
- struct ffa_ctx *ctx = d->arch.tee;
-
- if ( !shm )
- return;
-
- dec_ctx_shm_count(d, ctx);
- put_shm_pages(shm);
- xfree(shm);
-}
-
-static void init_range(struct ffa_address_range *addr_range,
- paddr_t pa)
-{
- memset(addr_range, 0, sizeof(*addr_range));
- addr_range->address = pa;
- addr_range->page_count = 1;
-}
-
-/*
- * This function uses the ffa_tx buffer to transmit the memory transaction
- * descriptor. The function depends ffa_tx_buffer_lock to be used to guard
- * the buffer from concurrent use.
- */
-static int share_shm(struct ffa_shm_mem *shm)
-{
- const uint32_t max_frag_len = FFA_RXTX_PAGE_COUNT * FFA_PAGE_SIZE;
- struct ffa_mem_access *mem_access_array;
- struct ffa_mem_transaction_1_1 *descr;
- struct ffa_address_range *addr_range;
- struct ffa_mem_region *region_descr;
- const unsigned int region_count = 1;
- void *buf = ffa_tx;
- uint32_t frag_len;
- uint32_t tot_len;
- paddr_t last_pa;
- unsigned int n;
- paddr_t pa;
-
- ASSERT(spin_is_locked(&ffa_tx_buffer_lock));
- ASSERT(shm->page_count);
-
- descr = buf;
- memset(descr, 0, sizeof(*descr));
- descr->sender_id = shm->sender_id;
- descr->handle = shm->handle;
- descr->mem_reg_attr = FFA_NORMAL_MEM_REG_ATTR;
- descr->mem_access_count = 1;
- descr->mem_access_size = sizeof(*mem_access_array);
- descr->mem_access_offs = MEM_ACCESS_OFFSET(0);
-
- mem_access_array = buf + descr->mem_access_offs;
- memset(mem_access_array, 0, sizeof(*mem_access_array));
- mem_access_array[0].access_perm.endpoint_id = shm->ep_id;
- mem_access_array[0].access_perm.perm = FFA_MEM_ACC_RW;
- mem_access_array[0].region_offs = REGION_OFFSET(descr->mem_access_count,
0);
-
- region_descr = buf + mem_access_array[0].region_offs;
- memset(region_descr, 0, sizeof(*region_descr));
- region_descr->total_page_count = shm->page_count;
-
- region_descr->address_range_count = 1;
- last_pa = page_to_maddr(shm->pages[0]);
- for ( n = 1; n < shm->page_count; last_pa = pa, n++ )
- {
- pa = page_to_maddr(shm->pages[n]);
- if ( last_pa + FFA_PAGE_SIZE == pa )
- continue;
- region_descr->address_range_count++;
- }
-
- tot_len = ADDR_RANGE_OFFSET(descr->mem_access_count, region_count,
- region_descr->address_range_count);
- if ( tot_len > max_frag_len )
- return FFA_RET_NOT_SUPPORTED;
-
- addr_range = region_descr->address_range_array;
- frag_len = ADDR_RANGE_OFFSET(descr->mem_access_count, region_count, 1);
- last_pa = page_to_maddr(shm->pages[0]);
- init_range(addr_range, last_pa);
- for ( n = 1; n < shm->page_count; last_pa = pa, n++ )
- {
- pa = page_to_maddr(shm->pages[n]);
- if ( last_pa + FFA_PAGE_SIZE == pa )
- {
- addr_range->page_count++;
- continue;
- }
-
- frag_len += sizeof(*addr_range);
- addr_range++;
- init_range(addr_range, pa);
- }
-
- return ffa_mem_share(tot_len, frag_len, 0, 0, &shm->handle);
-}
-
-static int read_mem_transaction(uint32_t ffa_vers, const void *buf, size_t
blen,
- struct ffa_mem_transaction_int *trans)
-{
- uint16_t mem_reg_attr;
- uint32_t flags;
- uint32_t count;
- uint32_t offs;
- uint32_t size;
-
- if ( ffa_vers >= FFA_VERSION_1_1 )
- {
- const struct ffa_mem_transaction_1_1 *descr;
-
- if ( blen < sizeof(*descr) )
- return FFA_RET_INVALID_PARAMETERS;
-
- descr = buf;
- trans->sender_id = descr->sender_id;
- mem_reg_attr = descr->mem_reg_attr;
- flags = descr->flags;
- trans->handle = descr->handle;
- trans->tag = descr->tag;
-
- count = descr->mem_access_count;
- size = descr->mem_access_size;
- offs = descr->mem_access_offs;
- }
- else
- {
- const struct ffa_mem_transaction_1_0 *descr;
-
- if ( blen < sizeof(*descr) )
- return FFA_RET_INVALID_PARAMETERS;
-
- descr = buf;
- trans->sender_id = descr->sender_id;
- mem_reg_attr = descr->mem_reg_attr;
- flags = descr->flags;
- trans->handle = descr->handle;
- trans->tag = descr->tag;
-
- count = descr->mem_access_count;
- size = sizeof(struct ffa_mem_access);
- offs = offsetof(struct ffa_mem_transaction_1_0, mem_access_array);
- }
- /*
- * Make sure that "descr" which is shared with the guest isn't accessed
- * again after this point.
- */
- barrier();
-
- /*
- * We're doing a rough check to see that no information is lost when
- * tranfering the values into a struct ffa_mem_transaction_int below.
- * The fields in struct ffa_mem_transaction_int are wide enough to hold
- * any valid value so being out of range means that something is wrong.
- */
- if ( mem_reg_attr > UINT8_MAX || flags > UINT8_MAX || size > UINT8_MAX ||
- count > UINT8_MAX || offs > UINT16_MAX )
- return FFA_RET_INVALID_PARAMETERS;
-
- /* Check that the endpoint memory access descriptor array fits */
- if ( size * count + offs > blen )
- return FFA_RET_INVALID_PARAMETERS;
-
- trans->mem_reg_attr = mem_reg_attr;
- trans->flags = flags;
- trans->mem_access_size = size;
- trans->mem_access_count = count;
- trans->mem_access_offs = offs;
-
- return 0;
-}
-
-static void ffa_handle_mem_share(struct cpu_user_regs *regs)
-{
- uint32_t tot_len = get_user_reg(regs, 1);
- uint32_t frag_len = get_user_reg(regs, 2);
- uint64_t addr = get_user_reg(regs, 3);
- uint32_t page_count = get_user_reg(regs, 4);
- const struct ffa_mem_region *region_descr;
- const struct ffa_mem_access *mem_access;
- struct ffa_mem_transaction_int trans;
- struct domain *d = current->domain;
- struct ffa_ctx *ctx = d->arch.tee;
- struct ffa_shm_mem *shm = NULL;
- unsigned int last_page_idx = 0;
- register_t handle_hi = 0;
- register_t handle_lo = 0;
- int ret = FFA_RET_DENIED;
- uint32_t range_count;
- uint32_t region_offs;
-
- /*
- * We're only accepting memory transaction descriptors via the rx/tx
- * buffer.
- */
- if ( addr )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_set_ret;
- }
-
- /* Check that fragment length doesn't exceed total length */
- if ( frag_len > tot_len )
- {
- ret = FFA_RET_INVALID_PARAMETERS;
- goto out_set_ret;
- }
-
- /* We currently only support a single fragment */
- if ( frag_len != tot_len )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_set_ret;
- }
-
- if ( !spin_trylock(&ctx->tx_lock) )
- {
- ret = FFA_RET_BUSY;
- goto out_set_ret;
- }
-
- if ( frag_len > ctx->page_count * FFA_PAGE_SIZE )
- goto out_unlock;
-
- ret = read_mem_transaction(ctx->guest_vers, ctx->tx, frag_len, &trans);
- if ( ret )
- goto out_unlock;
-
- if ( trans.mem_reg_attr != FFA_NORMAL_MEM_REG_ATTR )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_unlock;
- }
-
- /* Only supports sharing it with one SP for now */
- if ( trans.mem_access_count != 1 )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_unlock;
- }
-
- if ( trans.sender_id != ffa_get_vm_id(d) )
- {
- ret = FFA_RET_INVALID_PARAMETERS;
- goto out_unlock;
- }
-
- /* Check that it fits in the supplied data */
- if ( trans.mem_access_offs + trans.mem_access_size > frag_len )
- goto out_unlock;
-
- mem_access = ctx->tx + trans.mem_access_offs;
- if ( read_atomic(&mem_access->access_perm.perm) != FFA_MEM_ACC_RW )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_unlock;
- }
-
- region_offs = read_atomic(&mem_access->region_offs);
- if ( sizeof(*region_descr) + region_offs > frag_len )
- {
- ret = FFA_RET_NOT_SUPPORTED;
- goto out_unlock;
- }
-
- region_descr = ctx->tx + region_offs;
- range_count = read_atomic(®ion_descr->address_range_count);
- page_count = read_atomic(®ion_descr->total_page_count);
-
- if ( !page_count )
- {
- ret = FFA_RET_INVALID_PARAMETERS;
- goto out_unlock;
- }
-
- shm = alloc_ffa_shm_mem(d, page_count);
- if ( !shm )
- {
- ret = FFA_RET_NO_MEMORY;
- goto out_unlock;
- }
- shm->sender_id = trans.sender_id;
- shm->ep_id = read_atomic(&mem_access->access_perm.endpoint_id);
-
- /*
- * Check that the Composite memory region descriptor fits.
- */
- if ( sizeof(*region_descr) + region_offs +
- range_count * sizeof(struct ffa_address_range) > frag_len )
- {
- ret = FFA_RET_INVALID_PARAMETERS;
- goto out;
- }
-
- ret = get_shm_pages(d, shm, region_descr->address_range_array, range_count,
- 0, &last_page_idx);
- if ( ret )
- goto out;
- if ( last_page_idx != shm->page_count )
- {
- ret = FFA_RET_INVALID_PARAMETERS;
- goto out;
- }
-
- /* Note that share_shm() uses our tx buffer */
- spin_lock(&ffa_tx_buffer_lock);
- ret = share_shm(shm);
- spin_unlock(&ffa_tx_buffer_lock);
- if ( ret )
- goto out;
-
- spin_lock(&ctx->lock);
- list_add_tail(&shm->list, &ctx->shm_list);
- spin_unlock(&ctx->lock);
-
- uint64_to_regpair(&handle_hi, &handle_lo, shm->handle);
-
-out:
- if ( ret )
- free_ffa_shm_mem(d, shm);
-out_unlock:
- spin_unlock(&ctx->tx_lock);
-
-out_set_ret:
- if ( ret == 0)
- ffa_set_regs_success(regs, handle_lo, handle_hi);
- else
- ffa_set_regs_error(regs, ret);
-}
-
-/* Must only be called with ctx->lock held */
-static struct ffa_shm_mem *find_shm_mem(struct ffa_ctx *ctx, uint64_t handle)
-{
- struct ffa_shm_mem *shm;
-
- list_for_each_entry(shm, &ctx->shm_list, list)
- if ( shm->handle == handle )
- return shm;
-
- return NULL;
-}
-
-static int ffa_handle_mem_reclaim(uint64_t handle, uint32_t flags)
-{
- struct domain *d = current->domain;
- struct ffa_ctx *ctx = d->arch.tee;
- struct ffa_shm_mem *shm;
- register_t handle_hi;
- register_t handle_lo;
- int ret;
-
- spin_lock(&ctx->lock);
- shm = find_shm_mem(ctx, handle);
- if ( shm )
- list_del(&shm->list);
- spin_unlock(&ctx->lock);
- if ( !shm )
- return FFA_RET_INVALID_PARAMETERS;
-
- uint64_to_regpair(&handle_hi, &handle_lo, handle);
- ret = ffa_mem_reclaim(handle_lo, handle_hi, flags);
-
- if ( ret )
- {
- spin_lock(&ctx->lock);
- list_add_tail(&shm->list, &ctx->shm_list);
- spin_unlock(&ctx->lock);
- }
- else
- {
- free_ffa_shm_mem(d, shm);
- }
-
- return ret;
-}
-
static bool ffa_handle_call(struct cpu_user_regs *regs)
{
uint32_t fid = get_user_reg(regs, 0);
@@ -1284,8 +648,8 @@ static int ffa_domain_init(struct domain *d)
if ( !ffa_version )
return -ENODEV;
/*
- * We can't use that last possible domain ID or get_vm_id() would cause
- * an overflow.
+ * We can't use that last possible domain ID or ffa_get_vm_id() would
+ * cause an overflow.
*/
if ( d->domain_id >= UINT16_MAX)
return -ERANGE;
@@ -1348,68 +712,16 @@ static void send_vm_destroyed(struct domain *d)
}
}
-static void ffa_reclaim_shms(struct domain *d)
-{
- struct ffa_ctx *ctx = d->arch.tee;
- struct ffa_shm_mem *shm, *tmp;
- int32_t res;
-
- list_for_each_entry_safe(shm, tmp, &ctx->shm_list, list)
- {
- register_t handle_hi;
- register_t handle_lo;
-
- uint64_to_regpair(&handle_hi, &handle_lo, shm->handle);
- res = ffa_mem_reclaim(handle_lo, handle_hi, 0);
- switch ( res ) {
- case FFA_RET_OK:
- printk(XENLOG_G_DEBUG "%pd: ffa: Reclaimed handle %#lx\n",
- d, shm->handle);
- list_del(&shm->list);
- free_ffa_shm_mem(d, shm);
- break;
- case FFA_RET_DENIED:
- /*
- * A temporary error that may get resolved a bit later, it's
- * worth retrying.
- */
- printk(XENLOG_G_INFO "%pd: ffa: Failed to reclaim handle %#lx :
%d\n",
- d, shm->handle, res);
- break; /* We will retry later */
- default:
- /*
- * The rest of the error codes are not expected and are assumed
- * to be of a permanent nature. It not in our control to handle
- * the error properly so the object in this case is to try to
- * minimize the damage.
- *
- * FFA_RET_NO_MEMORY might be a temporary error as it it could
- * succeed if retried later, but treat it as permanent for now.
- */
- printk(XENLOG_G_INFO "%pd: ffa: Permanent failure to reclaim
handle %#lx : %d\n",
- d, shm->handle, res);
-
- /*
- * Remove the shm from the list and free it, but don't drop
- * references. This results in having the shared physical pages
- * permanently allocate and also keeps the domain as a zombie
- * domain.
- */
- list_del(&shm->list);
- xfree(shm);
- break;
- }
- }
-}
-
static void ffa_domain_teardown_continue(struct ffa_ctx *ctx, bool first_time)
{
struct ffa_ctx *next_ctx = NULL;
+ bool retry = false;
send_vm_destroyed(ctx->teardown_d);
- ffa_reclaim_shms(ctx->teardown_d);
+ if ( !ffa_shm_domain_destroy(ctx->teardown_d) )
+ retry = true;
- if ( ctx->shm_count ||
+ if ( retry ||
!bitmap_empty(ctx->vm_destroy_bitmap, subscr_vm_destroyed_count) )
{
printk(XENLOG_G_INFO "%pd: ffa: Remaining cleanup, retrying\n",
ctx->teardown_d);
diff --git a/xen/arch/arm/tee/ffa_private.h b/xen/arch/arm/tee/ffa_private.h
index 8352b6b55a..f3e2f42e57 100644
--- a/xen/arch/arm/tee/ffa_private.h
+++ b/xen/arch/arm/tee/ffa_private.h
@@ -247,6 +247,16 @@ struct ffa_ctx {
unsigned long vm_destroy_bitmap[];
};
+extern void *ffa_rx;
+extern void *ffa_tx;
+extern spinlock_t ffa_rx_buffer_lock;
+extern spinlock_t ffa_tx_buffer_lock;
+
+bool ffa_shm_domain_destroy(struct domain *d);
+void ffa_handle_mem_share(struct cpu_user_regs *regs);
+int ffa_handle_mem_reclaim(uint64_t handle, uint32_t flags);
+
+
static inline uint16_t ffa_get_vm_id(const struct domain *d)
{
/* +1 since 0 is reserved for the hypervisor in FF-A */
diff --git a/xen/arch/arm/tee/ffa_shm.c b/xen/arch/arm/tee/ffa_shm.c
new file mode 100644
index 0000000000..eed9ad2d29
--- /dev/null
+++ b/xen/arch/arm/tee/ffa_shm.c
@@ -0,0 +1,708 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2024 Linaro Limited
+ */
+
+#include <xen/const.h>
+#include <xen/sizes.h>
+#include <xen/types.h>
+#include <xen/mm.h>
+#include <xen/list.h>
+#include <xen/spinlock.h>
+
+#include <asm/smccc.h>
+#include <asm/regs.h>
+
+#include "ffa_private.h"
+
+/* Constituent memory region descriptor */
+struct ffa_address_range {
+ uint64_t address;
+ uint32_t page_count;
+ uint32_t reserved;
+};
+
+/* Composite memory region descriptor */
+struct ffa_mem_region {
+ uint32_t total_page_count;
+ uint32_t address_range_count;
+ uint64_t reserved;
+ struct ffa_address_range address_range_array[];
+};
+
+/* Memory access permissions descriptor */
+struct ffa_mem_access_perm {
+ uint16_t endpoint_id;
+ uint8_t perm;
+ uint8_t flags;
+};
+
+/* Endpoint memory access descriptor */
+struct ffa_mem_access {
+ struct ffa_mem_access_perm access_perm;
+ uint32_t region_offs;
+ uint64_t reserved;
+};
+
+/* Lend, donate or share memory transaction descriptor */
+struct ffa_mem_transaction_1_0 {
+ uint16_t sender_id;
+ uint8_t mem_reg_attr;
+ uint8_t reserved0;
+ uint32_t flags;
+ uint64_t handle;
+ uint64_t tag;
+ uint32_t reserved1;
+ uint32_t mem_access_count;
+ struct ffa_mem_access mem_access_array[];
+};
+
+struct ffa_mem_transaction_1_1 {
+ uint16_t sender_id;
+ uint16_t mem_reg_attr;
+ uint32_t flags;
+ uint64_t handle;
+ uint64_t tag;
+ uint32_t mem_access_size;
+ uint32_t mem_access_count;
+ uint32_t mem_access_offs;
+ uint8_t reserved[12];
+};
+
+/* Calculate offset of struct ffa_mem_access from start of buffer */
+#define MEM_ACCESS_OFFSET(access_idx) \
+ ( sizeof(struct ffa_mem_transaction_1_1) + \
+ ( access_idx ) * sizeof(struct ffa_mem_access) )
+
+/* Calculate offset of struct ffa_mem_region from start of buffer */
+#define REGION_OFFSET(access_count, region_idx) \
+ ( MEM_ACCESS_OFFSET(access_count) + \
+ ( region_idx ) * sizeof(struct ffa_mem_region) )
+
+/* Calculate offset of struct ffa_address_range from start of buffer */
+#define ADDR_RANGE_OFFSET(access_count, region_count, range_idx) \
+ ( REGION_OFFSET(access_count, region_count) + \
+ ( range_idx ) * sizeof(struct ffa_address_range) )
+
+/*
+ * The parts needed from struct ffa_mem_transaction_1_0 or struct
+ * ffa_mem_transaction_1_1, used to provide an abstraction of difference in
+ * data structures between version 1.0 and 1.1. This is just an internal
+ * interface and can be changed without changing any ABI.
+ */
+struct ffa_mem_transaction_int {
+ uint16_t sender_id;
+ uint8_t mem_reg_attr;
+ uint8_t flags;
+ uint8_t mem_access_size;
+ uint8_t mem_access_count;
+ uint16_t mem_access_offs;
+ uint64_t handle;
+ uint64_t tag;
+};
+
+struct ffa_shm_mem {
+ struct list_head list;
+ uint16_t sender_id;
+ uint16_t ep_id; /* endpoint, the one lending */
+ uint64_t handle; /* FFA_HANDLE_INVALID if not set yet */
+ unsigned int page_count;
+ struct page_info *pages[];
+};
+
+static int32_t ffa_mem_share(uint32_t tot_len, uint32_t frag_len,
+ register_t addr, uint32_t pg_count,
+ uint64_t *handle)
+{
+ struct arm_smccc_1_2_regs arg = {
+ .a0 = FFA_MEM_SHARE_64,
+ .a1 = tot_len,
+ .a2 = frag_len,
+ .a3 = addr,
+ .a4 = pg_count,
+ };
+ struct arm_smccc_1_2_regs resp;
+
+ arm_smccc_1_2_smc(&arg, &resp);
+
+ switch ( resp.a0 )
+ {
+ case FFA_ERROR:
+ if ( resp.a2 )
+ return resp.a2;
+ else
+ return FFA_RET_NOT_SUPPORTED;
+ case FFA_SUCCESS_32:
+ *handle = regpair_to_uint64(resp.a3, resp.a2);
+ return FFA_RET_OK;
+ case FFA_MEM_FRAG_RX:
+ *handle = regpair_to_uint64(resp.a2, resp.a1);
+ if ( resp.a3 > INT32_MAX ) /* Impossible value */
+ return FFA_RET_ABORTED;
+ return resp.a3 & INT32_MAX;
+ default:
+ return FFA_RET_NOT_SUPPORTED;
+ }
+}
+
+static int32_t ffa_mem_reclaim(uint32_t handle_lo, uint32_t handle_hi,
+ uint32_t flags)
+{
+ return ffa_simple_call(FFA_MEM_RECLAIM, handle_lo, handle_hi, flags, 0);
+}
+
+/*
+ * Gets all page and assigns them to the supplied shared memory object. If
+ * this function fails then the caller is still expected to call
+ * put_shm_pages() as a cleanup.
+ */
+static int get_shm_pages(struct domain *d, struct ffa_shm_mem *shm,
+ const struct ffa_address_range *range,
+ uint32_t range_count, unsigned int start_page_idx,
+ unsigned int *last_page_idx)
+{
+ unsigned int pg_idx = start_page_idx;
+ gfn_t gfn;
+ unsigned int n;
+ unsigned int m;
+ p2m_type_t t;
+ uint64_t addr;
+ uint64_t page_count;
+
+ for ( n = 0; n < range_count; n++ )
+ {
+ page_count = read_atomic(&range[n].page_count);
+ addr = read_atomic(&range[n].address);
+ for ( m = 0; m < page_count; m++ )
+ {
+ if ( pg_idx >= shm->page_count )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ gfn = gaddr_to_gfn(addr + m * FFA_PAGE_SIZE);
+ shm->pages[pg_idx] = get_page_from_gfn(d, gfn_x(gfn), &t,
+ P2M_ALLOC);
+ if ( !shm->pages[pg_idx] )
+ return FFA_RET_DENIED;
+ /* Only normal RW RAM for now */
+ if ( t != p2m_ram_rw )
+ return FFA_RET_DENIED;
+ pg_idx++;
+ }
+ }
+
+ *last_page_idx = pg_idx;
+
+ return FFA_RET_OK;
+}
+
+static void put_shm_pages(struct ffa_shm_mem *shm)
+{
+ unsigned int n;
+
+ for ( n = 0; n < shm->page_count && shm->pages[n]; n++ )
+ {
+ put_page(shm->pages[n]);
+ shm->pages[n] = NULL;
+ }
+}
+
+static bool inc_ctx_shm_count(struct domain *d, struct ffa_ctx *ctx)
+{
+ bool ret = true;
+
+ spin_lock(&ctx->lock);
+
+ if ( ctx->shm_count >= FFA_MAX_SHM_COUNT )
+ {
+ ret = false;
+ }
+ else
+ {
+ /*
+ * If this is the first shm added, increase the domain reference
+ * counter as we need to keep domain around a bit longer to reclaim
+ * the shared memory in the teardown path.
+ */
+ if ( !ctx->shm_count )
+ get_knownalive_domain(d);
+
+ ctx->shm_count++;
+ }
+
+ spin_unlock(&ctx->lock);
+
+ return ret;
+}
+
+static void dec_ctx_shm_count(struct domain *d, struct ffa_ctx *ctx)
+{
+ bool drop_ref;
+
+ spin_lock(&ctx->lock);
+
+ ASSERT(ctx->shm_count > 0);
+ ctx->shm_count--;
+
+ /*
+ * If this was the last shm removed, let go of the domain reference we
+ * took in inc_ctx_shm_count() above.
+ */
+ drop_ref = !ctx->shm_count;
+
+ spin_unlock(&ctx->lock);
+
+ if ( drop_ref )
+ put_domain(d);
+}
+
+static struct ffa_shm_mem *alloc_ffa_shm_mem(struct domain *d,
+ unsigned int page_count)
+{
+ struct ffa_ctx *ctx = d->arch.tee;
+ struct ffa_shm_mem *shm;
+
+ if ( page_count >= FFA_MAX_SHM_PAGE_COUNT )
+ return NULL;
+ if ( !inc_ctx_shm_count(d, ctx) )
+ return NULL;
+
+ shm = xzalloc_flex_struct(struct ffa_shm_mem, pages, page_count);
+ if ( shm )
+ shm->page_count = page_count;
+ else
+ dec_ctx_shm_count(d, ctx);
+
+ return shm;
+}
+
+static void free_ffa_shm_mem(struct domain *d, struct ffa_shm_mem *shm)
+{
+ struct ffa_ctx *ctx = d->arch.tee;
+
+ if ( !shm )
+ return;
+
+ dec_ctx_shm_count(d, ctx);
+ put_shm_pages(shm);
+ xfree(shm);
+}
+
+static void init_range(struct ffa_address_range *addr_range,
+ paddr_t pa)
+{
+ memset(addr_range, 0, sizeof(*addr_range));
+ addr_range->address = pa;
+ addr_range->page_count = 1;
+}
+
+/*
+ * This function uses the ffa_tx buffer to transmit the memory transaction
+ * descriptor. The function depends ffa_tx_buffer_lock to be used to guard
+ * the buffer from concurrent use.
+ */
+static int share_shm(struct ffa_shm_mem *shm)
+{
+ const uint32_t max_frag_len = FFA_RXTX_PAGE_COUNT * FFA_PAGE_SIZE;
+ struct ffa_mem_access *mem_access_array;
+ struct ffa_mem_transaction_1_1 *descr;
+ struct ffa_address_range *addr_range;
+ struct ffa_mem_region *region_descr;
+ const unsigned int region_count = 1;
+ void *buf = ffa_tx;
+ uint32_t frag_len;
+ uint32_t tot_len;
+ paddr_t last_pa;
+ unsigned int n;
+ paddr_t pa;
+
+ ASSERT(spin_is_locked(&ffa_tx_buffer_lock));
+ ASSERT(shm->page_count);
+
+ descr = buf;
+ memset(descr, 0, sizeof(*descr));
+ descr->sender_id = shm->sender_id;
+ descr->handle = shm->handle;
+ descr->mem_reg_attr = FFA_NORMAL_MEM_REG_ATTR;
+ descr->mem_access_count = 1;
+ descr->mem_access_size = sizeof(*mem_access_array);
+ descr->mem_access_offs = MEM_ACCESS_OFFSET(0);
+
+ mem_access_array = buf + descr->mem_access_offs;
+ memset(mem_access_array, 0, sizeof(*mem_access_array));
+ mem_access_array[0].access_perm.endpoint_id = shm->ep_id;
+ mem_access_array[0].access_perm.perm = FFA_MEM_ACC_RW;
+ mem_access_array[0].region_offs = REGION_OFFSET(descr->mem_access_count,
0);
+
+ region_descr = buf + mem_access_array[0].region_offs;
+ memset(region_descr, 0, sizeof(*region_descr));
+ region_descr->total_page_count = shm->page_count;
+
+ region_descr->address_range_count = 1;
+ last_pa = page_to_maddr(shm->pages[0]);
+ for ( n = 1; n < shm->page_count; last_pa = pa, n++ )
+ {
+ pa = page_to_maddr(shm->pages[n]);
+ if ( last_pa + FFA_PAGE_SIZE == pa )
+ continue;
+ region_descr->address_range_count++;
+ }
+
+ tot_len = ADDR_RANGE_OFFSET(descr->mem_access_count, region_count,
+ region_descr->address_range_count);
+ if ( tot_len > max_frag_len )
+ return FFA_RET_NOT_SUPPORTED;
+
+ addr_range = region_descr->address_range_array;
+ frag_len = ADDR_RANGE_OFFSET(descr->mem_access_count, region_count, 1);
+ last_pa = page_to_maddr(shm->pages[0]);
+ init_range(addr_range, last_pa);
+ for ( n = 1; n < shm->page_count; last_pa = pa, n++ )
+ {
+ pa = page_to_maddr(shm->pages[n]);
+ if ( last_pa + FFA_PAGE_SIZE == pa )
+ {
+ addr_range->page_count++;
+ continue;
+ }
+
+ frag_len += sizeof(*addr_range);
+ addr_range++;
+ init_range(addr_range, pa);
+ }
+
+ return ffa_mem_share(tot_len, frag_len, 0, 0, &shm->handle);
+}
+
+static int read_mem_transaction(uint32_t ffa_vers, const void *buf, size_t
blen,
+ struct ffa_mem_transaction_int *trans)
+{
+ uint16_t mem_reg_attr;
+ uint32_t flags;
+ uint32_t count;
+ uint32_t offs;
+ uint32_t size;
+
+ if ( ffa_vers >= FFA_VERSION_1_1 )
+ {
+ const struct ffa_mem_transaction_1_1 *descr;
+
+ if ( blen < sizeof(*descr) )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ descr = buf;
+ trans->sender_id = descr->sender_id;
+ mem_reg_attr = descr->mem_reg_attr;
+ flags = descr->flags;
+ trans->handle = descr->handle;
+ trans->tag = descr->tag;
+
+ count = descr->mem_access_count;
+ size = descr->mem_access_size;
+ offs = descr->mem_access_offs;
+ }
+ else
+ {
+ const struct ffa_mem_transaction_1_0 *descr;
+
+ if ( blen < sizeof(*descr) )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ descr = buf;
+ trans->sender_id = descr->sender_id;
+ mem_reg_attr = descr->mem_reg_attr;
+ flags = descr->flags;
+ trans->handle = descr->handle;
+ trans->tag = descr->tag;
+
+ count = descr->mem_access_count;
+ size = sizeof(struct ffa_mem_access);
+ offs = offsetof(struct ffa_mem_transaction_1_0, mem_access_array);
+ }
+ /*
+ * Make sure that "descr" which is shared with the guest isn't accessed
+ * again after this point.
+ */
+ barrier();
+
+ /*
+ * We're doing a rough check to see that no information is lost when
+ * tranfering the values into a struct ffa_mem_transaction_int below.
+ * The fields in struct ffa_mem_transaction_int are wide enough to hold
+ * any valid value so being out of range means that something is wrong.
+ */
+ if ( mem_reg_attr > UINT8_MAX || flags > UINT8_MAX || size > UINT8_MAX ||
+ count > UINT8_MAX || offs > UINT16_MAX )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ /* Check that the endpoint memory access descriptor array fits */
+ if ( size * count + offs > blen )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ trans->mem_reg_attr = mem_reg_attr;
+ trans->flags = flags;
+ trans->mem_access_size = size;
+ trans->mem_access_count = count;
+ trans->mem_access_offs = offs;
+
+ return 0;
+}
+
+void ffa_handle_mem_share(struct cpu_user_regs *regs)
+{
+ uint32_t tot_len = get_user_reg(regs, 1);
+ uint32_t frag_len = get_user_reg(regs, 2);
+ uint64_t addr = get_user_reg(regs, 3);
+ uint32_t page_count = get_user_reg(regs, 4);
+ const struct ffa_mem_region *region_descr;
+ const struct ffa_mem_access *mem_access;
+ struct ffa_mem_transaction_int trans;
+ struct domain *d = current->domain;
+ struct ffa_ctx *ctx = d->arch.tee;
+ struct ffa_shm_mem *shm = NULL;
+ unsigned int last_page_idx = 0;
+ register_t handle_hi = 0;
+ register_t handle_lo = 0;
+ int ret = FFA_RET_DENIED;
+ uint32_t range_count;
+ uint32_t region_offs;
+
+ /*
+ * We're only accepting memory transaction descriptors via the rx/tx
+ * buffer.
+ */
+ if ( addr )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_set_ret;
+ }
+
+ /* Check that fragment length doesn't exceed total length */
+ if ( frag_len > tot_len )
+ {
+ ret = FFA_RET_INVALID_PARAMETERS;
+ goto out_set_ret;
+ }
+
+ /* We currently only support a single fragment */
+ if ( frag_len != tot_len )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_set_ret;
+ }
+
+ if ( !spin_trylock(&ctx->tx_lock) )
+ {
+ ret = FFA_RET_BUSY;
+ goto out_set_ret;
+ }
+
+ if ( frag_len > ctx->page_count * FFA_PAGE_SIZE )
+ goto out_unlock;
+
+ ret = read_mem_transaction(ctx->guest_vers, ctx->tx, frag_len, &trans);
+ if ( ret )
+ goto out_unlock;
+
+ if ( trans.mem_reg_attr != FFA_NORMAL_MEM_REG_ATTR )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_unlock;
+ }
+
+ /* Only supports sharing it with one SP for now */
+ if ( trans.mem_access_count != 1 )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_unlock;
+ }
+
+ if ( trans.sender_id != ffa_get_vm_id(d) )
+ {
+ ret = FFA_RET_INVALID_PARAMETERS;
+ goto out_unlock;
+ }
+
+ /* Check that it fits in the supplied data */
+ if ( trans.mem_access_offs + trans.mem_access_size > frag_len )
+ goto out_unlock;
+
+ mem_access = ctx->tx + trans.mem_access_offs;
+ if ( read_atomic(&mem_access->access_perm.perm) != FFA_MEM_ACC_RW )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_unlock;
+ }
+
+ region_offs = read_atomic(&mem_access->region_offs);
+ if ( sizeof(*region_descr) + region_offs > frag_len )
+ {
+ ret = FFA_RET_NOT_SUPPORTED;
+ goto out_unlock;
+ }
+
+ region_descr = ctx->tx + region_offs;
+ range_count = read_atomic(®ion_descr->address_range_count);
+ page_count = read_atomic(®ion_descr->total_page_count);
+
+ if ( !page_count )
+ {
+ ret = FFA_RET_INVALID_PARAMETERS;
+ goto out_unlock;
+ }
+
+ shm = alloc_ffa_shm_mem(d, page_count);
+ if ( !shm )
+ {
+ ret = FFA_RET_NO_MEMORY;
+ goto out_unlock;
+ }
+ shm->sender_id = trans.sender_id;
+ shm->ep_id = read_atomic(&mem_access->access_perm.endpoint_id);
+
+ /*
+ * Check that the Composite memory region descriptor fits.
+ */
+ if ( sizeof(*region_descr) + region_offs +
+ range_count * sizeof(struct ffa_address_range) > frag_len )
+ {
+ ret = FFA_RET_INVALID_PARAMETERS;
+ goto out;
+ }
+
+ ret = get_shm_pages(d, shm, region_descr->address_range_array, range_count,
+ 0, &last_page_idx);
+ if ( ret )
+ goto out;
+ if ( last_page_idx != shm->page_count )
+ {
+ ret = FFA_RET_INVALID_PARAMETERS;
+ goto out;
+ }
+
+ /* Note that share_shm() uses our tx buffer */
+ spin_lock(&ffa_tx_buffer_lock);
+ ret = share_shm(shm);
+ spin_unlock(&ffa_tx_buffer_lock);
+ if ( ret )
+ goto out;
+
+ spin_lock(&ctx->lock);
+ list_add_tail(&shm->list, &ctx->shm_list);
+ spin_unlock(&ctx->lock);
+
+ uint64_to_regpair(&handle_hi, &handle_lo, shm->handle);
+
+out:
+ if ( ret )
+ free_ffa_shm_mem(d, shm);
+out_unlock:
+ spin_unlock(&ctx->tx_lock);
+
+out_set_ret:
+ if ( ret == 0)
+ ffa_set_regs_success(regs, handle_lo, handle_hi);
+ else
+ ffa_set_regs_error(regs, ret);
+}
+
+/* Must only be called with ctx->lock held */
+static struct ffa_shm_mem *find_shm_mem(struct ffa_ctx *ctx, uint64_t handle)
+{
+ struct ffa_shm_mem *shm;
+
+ list_for_each_entry(shm, &ctx->shm_list, list)
+ if ( shm->handle == handle )
+ return shm;
+
+ return NULL;
+}
+
+int ffa_handle_mem_reclaim(uint64_t handle, uint32_t flags)
+{
+ struct domain *d = current->domain;
+ struct ffa_ctx *ctx = d->arch.tee;
+ struct ffa_shm_mem *shm;
+ register_t handle_hi;
+ register_t handle_lo;
+ int ret;
+
+ spin_lock(&ctx->lock);
+ shm = find_shm_mem(ctx, handle);
+ if ( shm )
+ list_del(&shm->list);
+ spin_unlock(&ctx->lock);
+ if ( !shm )
+ return FFA_RET_INVALID_PARAMETERS;
+
+ uint64_to_regpair(&handle_hi, &handle_lo, handle);
+ ret = ffa_mem_reclaim(handle_lo, handle_hi, flags);
+
+ if ( ret )
+ {
+ spin_lock(&ctx->lock);
+ list_add_tail(&shm->list, &ctx->shm_list);
+ spin_unlock(&ctx->lock);
+ }
+ else
+ {
+ free_ffa_shm_mem(d, shm);
+ }
+
+ return ret;
+}
+
+bool ffa_shm_domain_destroy(struct domain *d)
+{
+ struct ffa_ctx *ctx = d->arch.tee;
+ struct ffa_shm_mem *shm, *tmp;
+ int32_t res;
+
+ list_for_each_entry_safe(shm, tmp, &ctx->shm_list, list)
+ {
+ register_t handle_hi;
+ register_t handle_lo;
+
+ uint64_to_regpair(&handle_hi, &handle_lo, shm->handle);
+ res = ffa_mem_reclaim(handle_lo, handle_hi, 0);
+ switch ( res ) {
+ case FFA_RET_OK:
+ printk(XENLOG_G_DEBUG "%pd: ffa: Reclaimed handle %#lx\n",
+ d, shm->handle);
+ list_del(&shm->list);
+ free_ffa_shm_mem(d, shm);
+ break;
+ case FFA_RET_DENIED:
+ /*
+ * A temporary error that may get resolved a bit later, it's
+ * worth retrying.
+ */
+ printk(XENLOG_G_INFO "%pd: ffa: Failed to reclaim handle %#lx :
%d\n",
+ d, shm->handle, res);
+ break; /* We will retry later */
+ default:
+ /*
+ * The rest of the error codes are not expected and are assumed
+ * to be of a permanent nature. It not in our control to handle
+ * the error properly so the object in this case is to try to
+ * minimize the damage.
+ *
+ * FFA_RET_NO_MEMORY might be a temporary error as it it could
+ * succeed if retried later, but treat it as permanent for now.
+ */
+ printk(XENLOG_G_INFO "%pd: ffa: Permanent failure to reclaim
handle %#lx : %d\n",
+ d, shm->handle, res);
+
+ /*
+ * Remove the shm from the list and free it, but don't drop
+ * references. This results in having the shared physical pages
+ * permanently allocate and also keeps the domain as a zombie
+ * domain.
+ */
+ list_del(&shm->list);
+ xfree(shm);
+ break;
+ }
+ }
+
+ return !ctx->shm_count;
+}
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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