Merge branch 'net-mvpp2-improve-the-interrupt-usage'

Antoine Tenart says:

====================
net: mvpp2: improve the interrupt usage

This series aims to improve the interrupts descriptions and usage in the
Marvell PPv2 driver.

- Before the series interrupts were named after their s/w usage,
  which in fact can be configured. The series rename all those
  interrupts and add a description of the ones left over.

- In PPv2 the interrupts are mapped to vectors. Those vectors were
  directly mapped to a given CPU, and per-cpu accesses were done. While
  this worked on our cases, the registers accesses mapped to the vectors
  are not actually linked to a given CPU. They instead are linked to
  what is called a "s/w thread". The series modify this so that the s/w
  threads are used instead of the CPU numbers, by adding an indirection.
  This means we now can have systems with more CPUs than s/w threads.

This is based on today's net-next, and was tested on various boards
using both versions of the PPv2 engine.

Two more patches will be coming, to update the device trees describing a
PPv2 engine. The patches are ready, but will go through a different
tree. I'll send them once this series will be accepted. This is not an
issue as the PPv2 driver keeps the dt bindings backward compatibility.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/marvell-pp2.txt

@@ -31,7 +31,7 @@ required.
 
 Required properties (port):
 
-- interrupts: interrupt for the port
+- interrupts: interrupt(s) for the port
 - port-id: ID of the port from the MAC point of view
 - gop-port-id: only for marvell,armada-7k-pp2, ID of the port from the
   GOP (Group Of Ports) point of view. This ID is used to index the
@@ -43,10 +43,12 @@ Optional properties (port):
 - marvell,loopback: port is loopback mode
 - phy: a phandle to a phy node defining the PHY address (as the reg
   property, a single integer).
-- interrupt-names: if more than a single interrupt for rx is given, must
-                   be the name associated to the interrupts listed. Valid
-                   names are: "tx-cpu0", "tx-cpu1", "tx-cpu2", "tx-cpu3",
-		   "rx-shared", "link".
+- interrupt-names: if more than a single interrupt for is given, must be the
+                   name associated to the interrupts listed. Valid names are:
+                   "hifX", with X in [0..8], and "link". The names "tx-cpu0",
+                   "tx-cpu1", "tx-cpu2", "tx-cpu3" and "rx-shared" are supported
+                   for backward compatibility but shouldn't be used for new
+                   additions.
 - marvell,system-controller: a phandle to the system controller.
 
 Example for marvell,armada-375-pp2:
@@ -89,9 +91,14 @@ cpm_ethernet: ethernet@0 {
 			     <ICU_GRP_NSR 43 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 47 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 51 IRQ_TYPE_LEVEL_HIGH>,
-			     <ICU_GRP_NSR 55 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "tx-cpu0", "tx-cpu1", "tx-cpu2",
-				  "tx-cpu3", "rx-shared";
+			     <ICU_GRP_NSR 55 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 59 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 63 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 67 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 71 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 129 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "hif0", "hif1", "hif2", "hif3", "hif4",
+				  "hif5", "hif6", "hif7", "hif8", "link";
 		port-id = <0>;
 		gop-port-id = <0>;
 	};
@@ -101,9 +108,14 @@ cpm_ethernet: ethernet@0 {
 			     <ICU_GRP_NSR 44 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 48 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 52 IRQ_TYPE_LEVEL_HIGH>,
-			     <ICU_GRP_NSR 56 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "tx-cpu0", "tx-cpu1", "tx-cpu2",
-				  "tx-cpu3", "rx-shared";
+			     <ICU_GRP_NSR 56 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 60 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 64 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 68 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 72 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 128 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "hif0", "hif1", "hif2", "hif3", "hif4",
+				  "hif5", "hif6", "hif7", "hif8", "link";
 		port-id = <1>;
 		gop-port-id = <2>;
 	};
@@ -113,9 +125,14 @@ cpm_ethernet: ethernet@0 {
 			     <ICU_GRP_NSR 45 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 49 IRQ_TYPE_LEVEL_HIGH>,
 			     <ICU_GRP_NSR 53 IRQ_TYPE_LEVEL_HIGH>,
-			     <ICU_GRP_NSR 57 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-names = "tx-cpu0", "tx-cpu1", "tx-cpu2",
-				  "tx-cpu3", "rx-shared";
+			     <ICU_GRP_NSR 57 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 61 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 65 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 69 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 73 IRQ_TYPE_LEVEL_HIGH>,
+			     <ICU_GRP_NSR 127 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "hif0", "hif1", "hif2", "hif3", "hif4",
+				  "hif5", "hif6", "hif7", "hif8", "link";
 		port-id = <2>;
 		gop-port-id = <3>;
 	};

drivers/net/ethernet/marvell/mvpp2/mvpp2.h

@@ -253,7 +253,8 @@
 #define     MVPP2_ISR_ENABLE_INTERRUPT(mask)	((mask) & 0xffff)
 #define     MVPP2_ISR_DISABLE_INTERRUPT(mask)	(((mask) << 16) & 0xffff0000)
 #define MVPP2_ISR_RX_TX_CAUSE_REG(port)		(0x5480 + 4 * (port))
-#define     MVPP2_CAUSE_RXQ_OCCUP_DESC_ALL_MASK	0xffff
+#define     MVPP2_CAUSE_RXQ_OCCUP_DESC_ALL_MASK(version) \
+					((version) == MVPP21 ? 0xffff : 0xff)
 #define     MVPP2_CAUSE_TXQ_OCCUP_DESC_ALL_MASK	0xff0000
 #define     MVPP2_CAUSE_TXQ_OCCUP_DESC_ALL_OFFSET	16
 #define     MVPP2_CAUSE_RX_FIFO_OVERRUN_MASK	BIT(24)
@@ -613,6 +614,7 @@
 
 /* Port flags */
 #define MVPP2_F_LOOPBACK		BIT(0)
+#define MVPP2_F_DT_COMPAT		BIT(1)
 
 /* Marvell tag types */
 enum mvpp2_tag_type {
@@ -662,7 +664,7 @@ enum mvpp2_prs_l3_cast {
 #define MVPP21_ADDR_SPACE_SZ		0
 #define MVPP22_ADDR_SPACE_SZ		SZ_64K
 
-#define MVPP2_MAX_THREADS		8
+#define MVPP2_MAX_THREADS		9
 #define MVPP2_MAX_QVECS			MVPP2_MAX_THREADS
 
 /* GMAC MIB Counters register definitions */
@@ -734,6 +736,11 @@ struct mvpp2 {
 	int port_count;
 	struct mvpp2_port *port_list[MVPP2_MAX_PORTS];
 
+	/* Number of Tx threads used */
+	unsigned int nthreads;
+	/* Map of threads needing locking */
+	unsigned long lock_map;
+
 	/* Aggregated TXQs */
 	struct mvpp2_tx_queue *aggr_txqs;
 
@@ -823,6 +830,12 @@ struct mvpp2_port {
 	/* Per-CPU port control */
 	struct mvpp2_port_pcpu __percpu *pcpu;
 
+	/* Protect the BM refills and the Tx paths when a thread is used on more
+	 * than a single CPU.
+	 */
+	spinlock_t bm_lock[MVPP2_MAX_THREADS];
+	spinlock_t tx_lock[MVPP2_MAX_THREADS];
+
 	/* Flags */
 	unsigned long flags;
 
@@ -969,7 +982,7 @@ struct mvpp2_txq_pcpu_buf {
 
 /* Per-CPU Tx queue control */
 struct mvpp2_txq_pcpu {
-	int cpu;
+	unsigned int thread;
 
 	/* Number of Tx DMA descriptors in the descriptor ring */
 	int size;
@@ -1095,14 +1108,6 @@ struct mvpp2_bm_pool {
 void mvpp2_write(struct mvpp2 *priv, u32 offset, u32 data);
 u32 mvpp2_read(struct mvpp2 *priv, u32 offset);
 
-u32 mvpp2_read_relaxed(struct mvpp2 *priv, u32 offset);
-
-void mvpp2_percpu_write(struct mvpp2 *priv, int cpu, u32 offset, u32 data);
-u32 mvpp2_percpu_read(struct mvpp2 *priv, int cpu, u32 offset);
-
-void mvpp2_percpu_write_relaxed(struct mvpp2 *priv, int cpu, u32 offset,
-				u32 data);
-
 void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name);
 
 void mvpp2_dbgfs_cleanup(struct mvpp2 *priv);