mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-17 10:04:26 +00:00
SPM: Implement SPCI open/close handle SMCs
Introduce SMCs that open and close handles according to the SPCI specification. Change-Id: I65f365f15612e01aa445e783e96e48ae275c39fd Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz
parent
e8ce60aeb1
commit
56ae97924d
4 changed files with 284 additions and 0 deletions
|
|
@ -138,4 +138,6 @@
|
|||
#define PLAT_SPM_NOTIFICATIONS_MAX U(30)
|
||||
#define PLAT_SPM_SERVICES_MAX U(30)
|
||||
|
||||
#define PLAT_SPCI_HANDLES_MAX_NUM U(20)
|
||||
|
||||
#endif /* ARM_SPM_DEF_H */
|
||||
|
|
|
|||
|
|
@ -4,14 +4,244 @@
|
|||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
*/
|
||||
|
||||
#include <assert.h>
|
||||
#include <debug.h>
|
||||
#include <smccc.h>
|
||||
#include <smccc_helpers.h>
|
||||
#include <spci_svc.h>
|
||||
#include <spinlock.h>
|
||||
#include <string.h>
|
||||
#include <utils.h>
|
||||
|
||||
#include "spm_private.h"
|
||||
|
||||
/*******************************************************************************
|
||||
* Macros to print UUIDs.
|
||||
******************************************************************************/
|
||||
#define PRINT_UUID_FORMAT "%08x-%08x-%08x-%08x"
|
||||
#define PRINT_UUID_ARGS(x) x[0], x[1], x[2], x[3]
|
||||
|
||||
/*******************************************************************************
|
||||
* Array of structs that contains information about all handles of Secure
|
||||
* Services that are currently open.
|
||||
******************************************************************************/
|
||||
typedef enum spci_handle_status {
|
||||
HANDLE_STATUS_CLOSED = 0,
|
||||
HANDLE_STATUS_OPEN,
|
||||
} spci_handle_status_t;
|
||||
|
||||
typedef struct spci_handle {
|
||||
/* 16-bit value used as reference in all SPCI calls */
|
||||
uint16_t handle;
|
||||
|
||||
/* Client ID of the client that requested the handle */
|
||||
uint16_t client_id;
|
||||
|
||||
/* Current status of the handle */
|
||||
spci_handle_status_t status;
|
||||
|
||||
/*
|
||||
* Context of the Secure Partition that provides the Secure Service
|
||||
* referenced by this handle.
|
||||
*/
|
||||
sp_context_t *sp_ctx;
|
||||
|
||||
/*
|
||||
* The same handle might be used for multiple requests, keep a reference
|
||||
* counter of them.
|
||||
*/
|
||||
unsigned int num_active_requests;
|
||||
} spci_handle_t;
|
||||
|
||||
static spci_handle_t spci_handles[PLAT_SPCI_HANDLES_MAX_NUM];
|
||||
static spinlock_t spci_handles_lock;
|
||||
|
||||
/*
|
||||
* Given a handle and a client ID, return the element of the spci_handles
|
||||
* array that contains the information of the handle. It can only return open
|
||||
* handles. It returns NULL if it couldn't find the element in the array.
|
||||
*/
|
||||
static spci_handle_t *spci_handle_info_get(uint16_t handle, uint16_t client_id)
|
||||
{
|
||||
size_t i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(spci_handles); i++) {
|
||||
spci_handle_t *h = &(spci_handles[i]);
|
||||
|
||||
/* Only check for open handles */
|
||||
if (h->status == HANDLE_STATUS_CLOSED) {
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Check if either the handle or the client ID are different */
|
||||
if ((h->handle != handle) || (h->client_id != client_id)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
return h;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns a unique value for a handle. This function must be called while
|
||||
* spci_handles_lock is locked. It returns 0 on success, -1 on error.
|
||||
*/
|
||||
static int spci_create_handle_value(uint16_t *handle)
|
||||
{
|
||||
/*
|
||||
* Trivial implementation that relies on the fact that any handle will
|
||||
* be closed before 2^16 more handles have been opened.
|
||||
*/
|
||||
static uint16_t handle_count;
|
||||
|
||||
*handle = handle_count;
|
||||
|
||||
handle_count++;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* This function looks for a Secure Partition that has a Secure Service
|
||||
* identified by the given UUID. It returns a handle that the client can use to
|
||||
* access the service, and an SPCI_*** error code.
|
||||
******************************************************************************/
|
||||
static uint64_t spci_service_handle_open_poll(void *handle, u_register_t x1,
|
||||
u_register_t x2, u_register_t x3, u_register_t x4,
|
||||
u_register_t x5, u_register_t x6, u_register_t x7)
|
||||
{
|
||||
unsigned int i;
|
||||
sp_context_t *sp_ptr;
|
||||
uint16_t service_handle;
|
||||
|
||||
/* Bits 31:16 of w7 are reserved (MBZ). */
|
||||
assert((x7 & 0xFFFF0000U) == 0);
|
||||
|
||||
uint16_t client_id = x7 & 0x0000FFFFU;
|
||||
uint32_t uuid[4] = { x1, x2, x3, x4 };
|
||||
|
||||
/* Get pointer to the Secure Partition that handles this service */
|
||||
sp_ptr = spm_sp_get_by_uuid(&uuid);
|
||||
if (sp_ptr == NULL) {
|
||||
WARN("SPCI: Service requested by client 0x%04x not found\n",
|
||||
client_id);
|
||||
WARN("SPCI: UUID: " PRINT_UUID_FORMAT "\n",
|
||||
PRINT_UUID_ARGS(uuid));
|
||||
|
||||
SMC_RET2(handle, SPCI_NOT_PRESENT, 0);
|
||||
}
|
||||
|
||||
/* Get lock of the array of handles */
|
||||
spin_lock(&spci_handles_lock);
|
||||
|
||||
/*
|
||||
* We need to record the client ID and Secure Partition that correspond
|
||||
* to this handle. Look for the first free entry in the array.
|
||||
*/
|
||||
for (i = 0; i < PLAT_SPCI_HANDLES_MAX_NUM; i++) {
|
||||
if (spci_handles[i].status == HANDLE_STATUS_CLOSED) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (i == PLAT_SPCI_HANDLES_MAX_NUM) {
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
WARN("SPCI: Can't open more handles. Client 0x%04x\n",
|
||||
client_id);
|
||||
WARN("SPCI: UUID: " PRINT_UUID_FORMAT "\n",
|
||||
PRINT_UUID_ARGS(uuid));
|
||||
|
||||
SMC_RET2(handle, SPCI_NO_MEMORY, 0);
|
||||
}
|
||||
|
||||
/* Create new handle value */
|
||||
if (spci_create_handle_value(&service_handle) != 0) {
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
WARN("SPCI: Can't create a new handle value. Client 0x%04x\n",
|
||||
client_id);
|
||||
WARN("SPCI: UUID: " PRINT_UUID_FORMAT "\n",
|
||||
PRINT_UUID_ARGS(uuid));
|
||||
|
||||
SMC_RET2(handle, SPCI_NO_MEMORY, 0);
|
||||
}
|
||||
|
||||
/* Save all information about this handle */
|
||||
spci_handles[i].status = HANDLE_STATUS_OPEN;
|
||||
spci_handles[i].client_id = client_id;
|
||||
spci_handles[i].handle = service_handle;
|
||||
spci_handles[i].num_active_requests = 0U;
|
||||
spci_handles[i].sp_ctx = sp_ptr;
|
||||
|
||||
/* Release lock of the array of handles */
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
VERBOSE("SPCI: Service handle request by client 0x%04x: 0x%04x\n",
|
||||
client_id, service_handle);
|
||||
VERBOSE("SPCI: UUID: " PRINT_UUID_FORMAT "\n", PRINT_UUID_ARGS(uuid));
|
||||
|
||||
/* The handle is returned in the top 16 bits of x1 */
|
||||
SMC_RET2(handle, SPCI_SUCCESS, ((uint32_t)service_handle) << 16);
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* This function closes a handle that a specific client uses to access a Secure
|
||||
* Service. It returns a SPCI_*** error code.
|
||||
******************************************************************************/
|
||||
static uint64_t spci_service_handle_close(void *handle, u_register_t x1)
|
||||
{
|
||||
spci_handle_t *handle_info;
|
||||
uint16_t client_id = x1 & 0x0000FFFFU;
|
||||
uint16_t service_handle = (x1 >> 16) & 0x0000FFFFU;
|
||||
|
||||
spin_lock(&spci_handles_lock);
|
||||
|
||||
handle_info = spci_handle_info_get(service_handle, client_id);
|
||||
|
||||
if (handle_info == NULL) {
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
WARN("SPCI: Tried to close invalid handle 0x%04x by client 0x%04x\n",
|
||||
service_handle, client_id);
|
||||
|
||||
SMC_RET1(handle, SPCI_INVALID_PARAMETER);
|
||||
}
|
||||
|
||||
if (handle_info->status != HANDLE_STATUS_OPEN) {
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
WARN("SPCI: Tried to close handle 0x%04x by client 0x%04x in status %d\n",
|
||||
service_handle, client_id, handle_info->status);
|
||||
|
||||
SMC_RET1(handle, SPCI_INVALID_PARAMETER);
|
||||
}
|
||||
|
||||
if (handle_info->num_active_requests != 0U) {
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
/* A handle can't be closed if there are requests left */
|
||||
WARN("SPCI: Tried to close handle 0x%04x by client 0x%04x with %d requests left\n",
|
||||
service_handle, client_id,
|
||||
handle_info->num_active_requests);
|
||||
|
||||
SMC_RET1(handle, SPCI_BUSY);
|
||||
}
|
||||
|
||||
memset(handle_info, 0, sizeof(spci_handle_t));
|
||||
|
||||
handle_info->status = HANDLE_STATUS_CLOSED;
|
||||
|
||||
spin_unlock(&spci_handles_lock);
|
||||
|
||||
VERBOSE("SPCI: Closed handle 0x%04x by client 0x%04x.\n",
|
||||
service_handle, client_id);
|
||||
|
||||
SMC_RET1(handle, SPCI_SUCCESS);
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* This function handles all SMCs in the range reserved for SPCI.
|
||||
******************************************************************************/
|
||||
|
|
@ -37,6 +267,24 @@ uint64_t spci_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
|
|||
case SPCI_FID_VERSION:
|
||||
SMC_RET1(handle, SPCI_VERSION_COMPILED);
|
||||
|
||||
case SPCI_FID_SERVICE_HANDLE_OPEN:
|
||||
{
|
||||
if ((smc_fid & SPCI_SERVICE_HANDLE_OPEN_NOTIFY_BIT) != 0) {
|
||||
/* Not supported for now */
|
||||
WARN("SPCI_SERVICE_HANDLE_OPEN_NOTIFY not supported.\n");
|
||||
SMC_RET1(handle, SPCI_INVALID_PARAMETER);
|
||||
}
|
||||
|
||||
uint64_t x5 = SMC_GET_GP(handle, CTX_GPREG_X5);
|
||||
uint64_t x6 = SMC_GET_GP(handle, CTX_GPREG_X6);
|
||||
uint64_t x7 = SMC_GET_GP(handle, CTX_GPREG_X7);
|
||||
|
||||
return spci_service_handle_open_poll(handle, x1, x2, x3,
|
||||
x4, x5, x6, x7);
|
||||
}
|
||||
case SPCI_FID_SERVICE_HANDLE_CLOSE:
|
||||
return spci_service_handle_close(handle, x1);
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -16,6 +16,7 @@
|
|||
#include <smccc.h>
|
||||
#include <smccc_helpers.h>
|
||||
#include <spinlock.h>
|
||||
#include <string.h>
|
||||
#include <spm_svc.h>
|
||||
#include <utils.h>
|
||||
#include <xlat_tables_v2.h>
|
||||
|
|
@ -44,6 +45,38 @@ sp_context_t *spm_cpu_get_sp_ctx(unsigned int linear_id)
|
|||
return cpu_sp_ctx[linear_id];
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* This function returns a pointer to the context of the Secure Partition that
|
||||
* handles the service specified by an UUID. It returns NULL if the UUID wasn't
|
||||
* found.
|
||||
******************************************************************************/
|
||||
sp_context_t *spm_sp_get_by_uuid(const uint32_t (*svc_uuid)[4])
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0U; i < PLAT_SPM_MAX_PARTITIONS; i++) {
|
||||
|
||||
sp_context_t *sp_ctx = &sp_ctx_array[i];
|
||||
|
||||
if (sp_ctx->is_present == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
struct sp_rd_sect_service *rdsvc;
|
||||
|
||||
for (rdsvc = sp_ctx->rd.service; rdsvc != NULL;
|
||||
rdsvc = rdsvc->next) {
|
||||
uint32_t *rd_uuid = (uint32_t *)(rdsvc->uuid);
|
||||
|
||||
if (memcmp(rd_uuid, svc_uuid, sizeof(rd_uuid)) == 0) {
|
||||
return sp_ctx;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* Set state of a Secure Partition context.
|
||||
******************************************************************************/
|
||||
|
|
|
|||
|
|
@ -84,6 +84,7 @@ int spm_memory_attributes_set_smc_handler(sp_context_t *sp_ctx,
|
|||
/* Functions to handle Secure Partition contexts */
|
||||
void spm_cpu_set_sp_ctx(unsigned int linear_id, sp_context_t *sp_ctx);
|
||||
sp_context_t *spm_cpu_get_sp_ctx(unsigned int linear_id);
|
||||
sp_context_t *spm_sp_get_by_uuid(const uint32_t (*svc_uuid)[4]);
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue