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authorSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>2017-08-29 09:23:39 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-08-31 07:26:37 +0300
commit5239af679a07427647b009ebb9c70b1a03ebca9b (patch)
treee2faee04706212509f8ab6c2bc914a637a04879b /arch/powerpc/include/asm/vas.h
parent98271d4198699947d66d6f8a02c09bd27cb90022 (diff)
downloadlinux-5239af679a07427647b009ebb9c70b1a03ebca9b.tar.xz
powerpc/powernv/vas: Define vas_tx_win_open()
Define an interface to open a VAS send window. This interface is intended to be used the Nest Accelerator (NX) driver(s) to open a send window and use it to submit compression/encryption requests to a VAS receive window. The receive window, identified by the [vasid, cop] parameters, must already be open in VAS (i.e connected to an NX engine). Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/vas.h')
-rw-r--r--arch/powerpc/include/asm/vas.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vas.h b/arch/powerpc/include/asm/vas.h
index 96bc24d61625..033461c17637 100644
--- a/arch/powerpc/include/asm/vas.h
+++ b/arch/powerpc/include/asm/vas.h
@@ -81,6 +81,29 @@ struct vas_rx_win_attr {
};
/*
+ * Window attributes specified by the in-kernel owner of a send window.
+ */
+struct vas_tx_win_attr {
+ enum vas_cop_type cop;
+ int wcreds_max;
+ int lpid;
+ int pidr; /* hardware PID (from SPRN_PID) */
+ int pid; /* linux process id */
+ int pswid;
+ int rsvd_txbuf_count;
+ int tc_mode;
+
+ bool user_win;
+ bool pin_win;
+ bool rej_no_credit;
+ bool rsvd_txbuf_enable;
+ bool tx_wcred_mode;
+ bool rx_wcred_mode;
+ bool tx_win_ord_mode;
+ bool rx_win_ord_mode;
+};
+
+/*
* Helper to initialize receive window attributes to defaults for an
* NX window.
*/
@@ -96,6 +119,25 @@ struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
struct vas_rx_win_attr *attr);
/*
+ * Helper to initialize send window attributes to defaults for an NX window.
+ */
+extern void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr,
+ enum vas_cop_type cop);
+
+/*
+ * Open a VAS send window for the instance of VAS identified by @vasid
+ * and the co-processor type @cop. Use @attr to initialize attributes
+ * of the window.
+ *
+ * Note: The instance of VAS must already have an open receive window for
+ * the coprocessor type @cop.
+ *
+ * Return a handle to the send window or ERR_PTR() on error.
+ */
+struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
+ struct vas_tx_win_attr *attr);
+
+/*
* Close the send or receive window identified by @win. For receive windows
* return -EAGAIN if there are active send windows attached to this receive
* window.