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Message-Id: <20230919-ffa_v1-1_notif-v2-6-6f3a3ca3923c@arm.com>
Date: Tue, 19 Sep 2023 18:40:54 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Sudeep Holla <sudeep.holla@....com>,
Jens Wiklander <jens.wiklander@...aro.org>,
Marc Bonnici <marc.bonnici@....com>,
Coboy Chen <coboy.chen@...iatek.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Olivier Deprez <olivier.deprez@....com>
Subject: [PATCH RFT v2 06/18] firmware: arm_ffa: Implement the
FFA_NOTIFICATION_GET interface
The framework provides an interface to the receiver to determine the
identity of the notification. A receiver endpoint must use the
FFA_NOTIFICATION_GET interface to retrieve its pending notifications
and handle them.
Add the support for FFA_NOTIFICATION_GET to allow the caller(receiver)
to fetch its pending notifications from other partitions in the system.
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/firmware/arm_ffa/driver.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 2aae838ba46a..acb58715687c 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -581,6 +581,14 @@ static int ffa_notification_bitmap_destroy(void)
((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
#define NOTIFICATION_BITMAP_LOW(x) \
((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
+#define PACK_NOTIFICATION_BITMAP(low, high) \
+ (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
+ FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
+
+#define RECEIVER_VCPU_MASK GENMASK(31, 16)
+#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
+ (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
+ FIELD_PREP(RECEIVER_ID_MASK, (r)))
static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
u32 flags, bool is_bind)
@@ -624,6 +632,35 @@ int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
return 0;
}
+struct ffa_notify_bitmaps {
+ u64 sp_map;
+ u64 vm_map;
+ u64 arch_map;
+};
+
+static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
+{
+ ffa_value_t ret;
+ u16 src_id = drv_info->vm_id;
+ u16 cpu_id = smp_processor_id();
+ u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+ else if (ret.a0 != FFA_SUCCESS)
+ return -EINVAL; /* Something else went wrong. */
+
+ notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
+ notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
+ notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);
+
+ return 0;
+}
+
static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
ffa_value_t ret;
--
2.42.0
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