diff mbox series

[v1,5/5] misc: fastrpc: Add support to allocate shared context bank

Message ID 1693499292-19083-6-git-send-email-quic_ekangupt@quicinc.com
State Superseded
Headers show
Series Add multimode invoke request IOCTl support | expand

Commit Message

Ekansh Gupta Aug. 31, 2023, 4:28 p.m. UTC
Context banks could be set as a shared one using a DT propery
"qcom,nsessions". The property takes the number of session to
be created of the context bank. This change provides a control
mechanism for user to use shared context banks for light weight
processes. The session is set as shared while its creation and if
a user requests for shared context bank, the same will be allocated
during process initialization.

Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
---
 drivers/misc/fastrpc.c | 121 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 82 insertions(+), 39 deletions(-)
diff mbox series

Patch

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 1b26718..6ac1403 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -296,6 +296,7 @@  struct fastrpc_session_ctx {
 	int sid;
 	bool used;
 	bool valid;
+	bool sharedcb;
 };
 
 struct fastrpc_channel_ctx {
@@ -343,12 +344,22 @@  struct fastrpc_user {
 	int tgid;
 	int pd;
 	bool is_secure_dev;
+	bool sharedcb;
 	/* Lock for lists */
 	spinlock_t lock;
 	/* lock for allocations */
 	struct mutex mutex;
 };
 
+struct fastrpc_ctrl_smmu {
+	u32 sharedcb;	/* Set to SMMU share context bank */
+};
+
+struct fastrpc_internal_control {
+	u32 req;
+	struct fastrpc_ctrl_smmu smmu;
+};
+
 static inline int64_t getnstimediff(struct timespec64 *start)
 {
 	int64_t ns;
@@ -850,6 +861,37 @@  static const struct dma_buf_ops fastrpc_dma_buf_ops = {
 	.release = fastrpc_release,
 };
 
+static struct fastrpc_session_ctx *fastrpc_session_alloc(
+					struct fastrpc_channel_ctx *cctx, bool sharedcb)
+{
+	struct fastrpc_session_ctx *session = NULL;
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&cctx->lock, flags);
+	for (i = 0; i < cctx->sesscount; i++) {
+		if (!cctx->session[i].used && cctx->session[i].valid &&
+			cctx->session[i].sharedcb == sharedcb) {
+			cctx->session[i].used = true;
+			session = &cctx->session[i];
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&cctx->lock, flags);
+
+	return session;
+}
+
+static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
+				 struct fastrpc_session_ctx *session)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cctx->lock, flags);
+	session->used = false;
+	spin_unlock_irqrestore(&cctx->lock, flags);
+}
+
 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
 			      u64 len, u32 attr, struct fastrpc_map **ppmap)
 {
@@ -1446,6 +1488,10 @@  static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
 		goto err_name;
 	}
 
+	fl->sctx = fastrpc_session_alloc(fl->cctx, fl->sharedcb);
+	if (!fl->sctx)
+		return -EBUSY;
+
 	if (!fl->cctx->remote_heap) {
 		err = fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen,
 						&fl->cctx->remote_heap);
@@ -1563,6 +1609,10 @@  static int fastrpc_init_create_process(struct fastrpc_user *fl,
 		goto err;
 	}
 
+	fl->sctx = fastrpc_session_alloc(fl->cctx, fl->sharedcb);
+	if (!fl->sctx)
+		return -EBUSY;
+
 	inbuf.pgid = fl->tgid;
 	inbuf.namelen = strlen(current->comm) + 1;
 	inbuf.filelen = init.filelen;
@@ -1637,36 +1687,6 @@  static int fastrpc_init_create_process(struct fastrpc_user *fl,
 	return err;
 }
 
-static struct fastrpc_session_ctx *fastrpc_session_alloc(
-					struct fastrpc_channel_ctx *cctx)
-{
-	struct fastrpc_session_ctx *session = NULL;
-	unsigned long flags;
-	int i;
-
-	spin_lock_irqsave(&cctx->lock, flags);
-	for (i = 0; i < cctx->sesscount; i++) {
-		if (!cctx->session[i].used && cctx->session[i].valid) {
-			cctx->session[i].used = true;
-			session = &cctx->session[i];
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&cctx->lock, flags);
-
-	return session;
-}
-
-static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
-				 struct fastrpc_session_ctx *session)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&cctx->lock, flags);
-	session->used = false;
-	spin_unlock_irqrestore(&cctx->lock, flags);
-}
-
 static void fastrpc_context_list_free(struct fastrpc_user *fl)
 {
 	struct fastrpc_invoke_ctx *ctx, *n;
@@ -1771,15 +1791,6 @@  static int fastrpc_device_open(struct inode *inode, struct file *filp)
 	fl->cctx = cctx;
 	fl->is_secure_dev = fdevice->secure;
 
-	fl->sctx = fastrpc_session_alloc(cctx);
-	if (!fl->sctx) {
-		dev_err(&cctx->rpdev->dev, "No session available\n");
-		mutex_destroy(&fl->mutex);
-		kfree(fl);
-
-		return -EBUSY;
-	}
-
 	spin_lock_irqsave(&cctx->lock, flags);
 	list_add_tail(&fl->user, &cctx->users);
 	spin_unlock_irqrestore(&cctx->lock, flags);
@@ -1838,6 +1849,10 @@  static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
 	struct fastrpc_enhanced_invoke ioctl;
 	int tgid = fl->tgid;
 
+	fl->sctx = fastrpc_session_alloc(fl->cctx, fl->sharedcb);
+	if (!fl->sctx)
+		return -EBUSY;
+
 	args[0].ptr = (u64)(uintptr_t) &tgid;
 	args[0].length = sizeof(tgid);
 	args[0].fd = -1;
@@ -1884,11 +1899,32 @@  static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
 	return err;
 }
 
+static int fastrpc_internal_control(struct fastrpc_user *fl,
+					struct fastrpc_internal_control *cp)
+{
+	int err = 0;
+
+	if (!fl)
+		return -EBADF;
+	if (!cp)
+		return -EINVAL;
+
+	case FASTRPC_CONTROL_SMMU:
+		fl->sharedcb = cp->smmu.sharedcb;
+		break;
+	default:
+		err = -EBADRQC;
+		break;
+	}
+	return err;
+}
+
 static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *argp)
 {
 	struct fastrpc_enhanced_invoke einv;
 	struct fastrpc_invoke_args *args = NULL;
 	struct fastrpc_ioctl_multimode_invoke invoke;
+	struct fastrpc_internal_control cp = {0};
 	u32 nscalars;
 	u64 *perf_kernel;
 	int err;
@@ -1921,6 +1957,12 @@  static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *argp)
 		err = fastrpc_internal_invoke(fl, false, &einv);
 		kfree(args);
 		break;
+	case FASTRPC_INVOKE_CONTROL:
+		if (copy_from_user(&cp, (void __user *)(uintptr_t)invoke.invparam, sizeof(cp)))
+			return  -EFAULT;
+
+		err = fastrpc_internal_control(fl, &cp);
+		break;
 	default:
 		err = -ENOTTY;
 		break;
@@ -2421,6 +2463,7 @@  static int fastrpc_cb_probe(struct platform_device *pdev)
 	if (sessions > 0) {
 		struct fastrpc_session_ctx *dup_sess;
 
+		sess->sharedcb = true;
 		for (i = 1; i < sessions; i++) {
 			if (cctx->sesscount >= FASTRPC_MAX_SESSIONS)
 				break;