[PATCH] -mm: add error checking to mpc85xx rapidio support
mporter at kernel.crashing.org
mporter at kernel.crashing.org
Tue Jun 14 10:14:31 EST 2005
Add more error checking to the MPC85xx RIO support. Clean up some
printks.
Signed-off-by: Matt Porter <mporter at kernel.crashing.org>
diff --git a/arch/ppc/syslib/ppc85xx_rio.c b/arch/ppc/syslib/ppc85xx_rio.c
--- a/arch/ppc/syslib/ppc85xx_rio.c
+++ b/arch/ppc/syslib/ppc85xx_rio.c
@@ -41,6 +41,7 @@
#define RIO_MSG_ISR_DIQI 0x00000001
#define RIO_MSG_DESC_SIZE 32
+#define RIO_MSG_BUFFER_SIZE 4096
#define RIO_MIN_TX_RING_SIZE 2
#define RIO_MAX_TX_RING_SIZE 2048
#define RIO_MIN_RX_RING_SIZE 2
@@ -301,9 +302,9 @@ rio_hw_add_outb_message(struct rio_mport
(struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot;
int ret = 0;
- pr_debug(KERN_INFO
- "RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
- rdev->destid, mbox, (int)buffer, len);
+ pr_debug
+ ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
+ rdev->destid, mbox, (int)buffer, len);
if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
ret = -EINVAL;
@@ -361,13 +362,13 @@ mpc85xx_rio_tx_handler(int irq, void *de
osr = in_be32((void *)&msg_regs->osr);
if (osr & RIO_MSG_OSR_TE) {
- printk(KERN_INFO "RIO: outbound message transmission error\n");
+ pr_info("RIO: outbound message transmission error\n");
out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE);
goto out;
}
if (osr & RIO_MSG_OSR_QOI) {
- printk(KERN_INFO "RIO: outbound message queue overflow\n");
+ pr_info("RIO: outbound message queue overflow\n");
out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI);
goto out;
}
@@ -392,12 +393,12 @@ mpc85xx_rio_tx_handler(int irq, void *de
* @entries: Number of entries in the outbound mailbox ring
*
* Initializes buffer ring, request the outbound message interrupt,
- * and enables the outbound message unit. Returns %0 on success or
- * %-EINVAL on failure.
+ * and enables the outbound message unit. Returns %0 on success and
+ * %-EINVAL or %-ENOMEM on failure.
*/
int rio_open_outb_mbox(struct rio_mport *mport, int mbox, int entries)
{
- int i, rc = 0;
+ int i, j, rc = 0;
if ((entries < RIO_MIN_TX_RING_SIZE) ||
(entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
@@ -409,17 +410,33 @@ int rio_open_outb_mbox(struct rio_mport
msg_tx_ring.size = entries;
for (i = 0; i < msg_tx_ring.size; i++) {
- msg_tx_ring.virt_buffer[i] =
- (void *)__get_free_page(GFP_KERNEL);
- msg_tx_ring.phys_buffer[i] =
- (dma_addr_t) __pa(msg_tx_ring.virt_buffer[i]);
+ if (!
+ (msg_tx_ring.virt_buffer[i] =
+ dma_alloc_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+ &msg_tx_ring.phys_buffer[i],
+ GFP_KERNEL))) {
+ rc = -ENOMEM;
+ for (j = 0; j < msg_tx_ring.size; j++)
+ if (msg_tx_ring.virt_buffer[j])
+ dma_free_coherent(NULL,
+ RIO_MSG_BUFFER_SIZE,
+ msg_tx_ring.
+ virt_buffer[j],
+ msg_tx_ring.
+ phys_buffer[j]);
+ goto out;
+ }
}
/* Initialize outbound message descriptor ring */
- msg_tx_ring.virt = dma_alloc_coherent(NULL,
- msg_tx_ring.size *
- RIO_MSG_DESC_SIZE,
- &msg_tx_ring.phys, GFP_KERNEL);
+ if (!(msg_tx_ring.virt = dma_alloc_coherent(NULL,
+ msg_tx_ring.size *
+ RIO_MSG_DESC_SIZE,
+ &msg_tx_ring.phys,
+ GFP_KERNEL))) {
+ rc = -ENOMEM;
+ goto out_dma;
+ }
memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE);
msg_tx_ring.tx_slot = 0;
@@ -434,8 +451,10 @@ int rio_open_outb_mbox(struct rio_mport
out_be32((void *)&msg_regs->osr, 0x000000b3);
/* Hook up outbound message handler */
- request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0, "msg_tx",
- (void *)mport);
+ if ((rc =
+ request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0,
+ "msg_tx", (void *)mport)) < 0)
+ goto out_irq;
/*
* Configure outbound message unit
@@ -456,6 +475,18 @@ int rio_open_outb_mbox(struct rio_mport
out:
return rc;
+
+ out_irq:
+ dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+ msg_tx_ring.virt, msg_tx_ring.phys);
+
+ out_dma:
+ for (i = 0; i < msg_tx_ring.size; i++)
+ dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+ msg_tx_ring.virt_buffer[i],
+ msg_tx_ring.phys_buffer[i]);
+
+ return rc;
}
/**
@@ -497,7 +528,7 @@ mpc85xx_rio_rx_handler(int irq, void *de
isr = in_be32((void *)&msg_regs->isr);
if (isr & RIO_MSG_ISR_TE) {
- printk(KERN_INFO "RIO: inbound message reception error\n");
+ pr_info("RIO: inbound message reception error\n");
out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE);
goto out;
}
@@ -528,7 +559,7 @@ mpc85xx_rio_rx_handler(int irq, void *de
*
* Initializes buffer ring, request the inbound message interrupt,
* and enables the inbound message unit. Returns %0 on success
- * or %-EINVAL on failure.
+ * and %-EINVAL or %-ENOMEM on failure.
*/
int rio_open_inb_mbox(struct rio_mport *mport, int mbox, int entries)
{
@@ -547,10 +578,14 @@ int rio_open_inb_mbox(struct rio_mport *
msg_rx_ring.virt_buffer[i] = NULL;
/* Initialize inbound message ring */
- msg_rx_ring.virt = dma_alloc_coherent(NULL,
- msg_rx_ring.size *
- RIO_MAX_MSG_SIZE,
- &msg_rx_ring.phys, GFP_KERNEL);
+ if (!(msg_rx_ring.virt = dma_alloc_coherent(NULL,
+ msg_rx_ring.size *
+ RIO_MAX_MSG_SIZE,
+ &msg_rx_ring.phys,
+ GFP_KERNEL))) {
+ rc = -ENOMEM;
+ goto out;
+ }
/* Point dequeue/enqueue pointers at first entry in ring */
out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys);
@@ -560,8 +595,14 @@ int rio_open_inb_mbox(struct rio_mport *
out_be32((void *)&msg_regs->isr, 0x00000091);
/* Hook up inbound message handler */
- request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0, "msg_rx",
- (void *)mport);
+ if ((rc =
+ request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0,
+ "msg_rx", (void *)mport)) < 0) {
+ dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
+ msg_tx_ring.virt_buffer[i],
+ msg_tx_ring.phys_buffer[i]);
+ goto out;
+ }
/*
* Configure inbound message unit:
@@ -665,8 +706,8 @@ void *rio_hw_get_inb_message(struct rio_
buf = msg_rx_ring.virt_buffer[buf_idx];
if (!buf) {
- pr_debug(KERN_ERR
- "RIO: inbound message copy failed, no buffers\n");
+ printk(KERN_ERR
+ "RIO: inbound message copy failed, no buffers\n");
goto out1;
}
@@ -704,13 +745,13 @@ mpc85xx_rio_dbell_handler(int irq, void
dsr = in_be32((void *)&msg_regs->dsr);
if (dsr & DOORBELL_DSR_TE) {
- printk(KERN_INFO "RIO: doorbell reception error\n");
+ pr_info("RIO: doorbell reception error\n");
out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE);
goto out;
}
if (dsr & DOORBELL_DSR_QFI) {
- printk(KERN_INFO "RIO: doorbell queue full\n");
+ pr_info("RIO: doorbell queue full\n");
out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI);
goto out;
}
@@ -724,9 +765,9 @@ mpc85xx_rio_dbell_handler(int irq, void
struct rio_dbell *dbell;
int found = 0;
- pr_debug(KERN_INFO
- "RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
- DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
+ pr_debug
+ ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
+ DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
list_for_each_entry(dbell, &port->dbells, node) {
if ((dbell->res->start <= DBELL_INF(dmsg)) &&
@@ -739,10 +780,9 @@ mpc85xx_rio_dbell_handler(int irq, void
dbell->dinb(port, DBELL_SID(dmsg), DBELL_TID(dmsg),
DBELL_INF(dmsg));
} else {
- pr_debug(KERN_INFO
- "RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
- DBELL_SID(dmsg), DBELL_TID(dmsg),
- DBELL_INF(dmsg));
+ pr_debug
+ ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
+ DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
}
dmr = in_be32((void *)&msg_regs->dmr);
out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI);
@@ -758,19 +798,33 @@ mpc85xx_rio_dbell_handler(int irq, void
* @mport: Master port implementing the inbound doorbell unit
*
* Initializes doorbell unit hardware and inbound DMA buffer
- * ring. Called from mpc85xx_rio_setup().
+ * ring. Called from mpc85xx_rio_setup(). Returns %0 on success
+ * or %-ENOMEM on failure.
*/
-static void mpc85xx_rio_doorbell_init(struct rio_mport *mport)
+static int mpc85xx_rio_doorbell_init(struct rio_mport *mport)
{
+ int rc = 0;
+
/* Map outbound doorbell window immediately after maintenance window */
- dbell_win =
- (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
- RIO_DBELL_WIN_SIZE);
+ if (!(dbell_win =
+ (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
+ RIO_DBELL_WIN_SIZE))) {
+ printk(KERN_ERR
+ "RIO: unable to map outbound doorbell window\n");
+ rc = -ENOMEM;
+ goto out;
+ }
/* Initialize inbound doorbells */
- dbell_ring.virt = dma_alloc_coherent(NULL,
- 512 * DOORBELL_MESSAGE_SIZE,
- &dbell_ring.phys, GFP_KERNEL);
+ if (!(dbell_ring.virt = dma_alloc_coherent(NULL,
+ 512 * DOORBELL_MESSAGE_SIZE,
+ &dbell_ring.phys,
+ GFP_KERNEL))) {
+ printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
+ rc = -ENOMEM;
+ iounmap((void *)dbell_win);
+ goto out;
+ }
/* Point dequeue/enqueue pointers at first entry in ring */
out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys);
@@ -780,11 +834,22 @@ static void mpc85xx_rio_doorbell_init(st
out_be32((void *)&msg_regs->dsr, 0x00000091);
/* Hook up doorbell handler */
- request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
- "dbell_rx", (void *)mport);
+ if ((rc =
+ request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
+ "dbell_rx", (void *)mport) < 0)) {
+ iounmap((void *)dbell_win);
+ dma_free_coherent(NULL, 512 * DOORBELL_MESSAGE_SIZE,
+ dbell_ring.virt, dbell_ring.phys);
+ printk(KERN_ERR
+ "MPC85xx RIO: unable to request inbound doorbell irq");
+ goto out;
+ }
/* Configure doorbells for snooping, 512 entries, and enable */
out_be32((void *)&msg_regs->dmr, 0x00108161);
+
+ out:
+ return rc;
}
static char *cmdline = NULL;
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