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authorBryan O'Sullivan <bos@pathscale.com>2006-07-01 04:36:15 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-01 09:56:01 -0700
commit35783ec07c3f7f6902abe4433e7be1b664d0bbaf (patch)
treef2bdf80a430862c46cc820b597fcb7cb88c7e777
parent6d8e9dd050ea78862b6c5e2c873ad6407f9b2428 (diff)
[PATCH] IB/ipath: fix a bug that results in addresses near 0 being written via DMA
We can't tell for sure if any packets are in the infinipath receive buffer when we shut down a chip port. Normally this is taken care of by orderly shutdown, but when processes are terminated, or sending process has a bug, we can continue to receive packets. So rather than writing zero to the address registers for the closing port, we point it at a dummy memory. Signed-off-by: Dave Olson <dave.olson@qlogic.com> Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com> Cc: "Michael S. Tsirkin" <mst@mellanox.co.il> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/infiniband/hw/ipath/ipath_driver.c6
-rw-r--r--drivers/infiniband/hw/ipath/ipath_file_ops.c61
-rw-r--r--drivers/infiniband/hw/ipath/ipath_init_chip.c17
-rw-r--r--drivers/infiniband/hw/ipath/ipath_kernel.h2
4 files changed, 60 insertions, 26 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
index 4109913c20a..f647918db62 100644
--- a/drivers/infiniband/hw/ipath/ipath_driver.c
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c
@@ -1824,6 +1824,12 @@ static void cleanup_device(struct ipath_devdata *dd)
dd->ipath_pioavailregs_phys);
dd->ipath_pioavailregs_dma = NULL;
}
+ if (dd->ipath_dummy_hdrq) {
+ dma_free_coherent(&dd->pcidev->dev,
+ dd->ipath_pd[0]->port_rcvhdrq_size,
+ dd->ipath_dummy_hdrq, dd->ipath_dummy_hdrq_phys);
+ dd->ipath_dummy_hdrq = NULL;
+ }
if (dd->ipath_pageshadow) {
struct page **tmpp = dd->ipath_pageshadow;
diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
index e89d3a17acd..51a609d4708 100644
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -1486,42 +1486,51 @@ static int ipath_close(struct inode *in, struct file *fp)
}
if (dd->ipath_kregbase) {
- ipath_write_kreg_port(
- dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
- port, 0ULL);
- ipath_write_kreg_port(
- dd, dd->ipath_kregs->kr_rcvhdraddr,
- pd->port_port, 0);
+ int i;
+ /* atomically clear receive enable port. */
+ clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
+ &dd->ipath_rcvctrl);
+ ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
+ dd->ipath_rcvctrl);
+ /* and read back from chip to be sure that nothing
+ * else is in flight when we do the rest */
+ (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
/* clean up the pkeys for this port user */
ipath_clean_part_key(pd, dd);
- if (port < dd->ipath_cfgports) {
- int i = dd->ipath_pbufsport * (port - 1);
- ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
- /* atomically clear receive enable port. */
- clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
- &dd->ipath_rcvctrl);
- ipath_write_kreg(
- dd,
- dd->ipath_kregs->kr_rcvctrl,
- dd->ipath_rcvctrl);
-
- if (dd->ipath_pageshadow)
- unlock_expected_tids(pd);
- ipath_stats.sps_ports--;
- ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
- pd->port_comm, pd->port_pid,
- dd->ipath_unit, port);
- }
+ /*
+ * be paranoid, and never write 0's to these, just use an
+ * unused part of the port 0 tail page. Of course,
+ * rcvhdraddr points to a large chunk of memory, so this
+ * could still trash things, but at least it won't trash
+ * page 0, and by disabling the port, it should stop "soon",
+ * even if a packet or two is in already in flight after we
+ * disabled the port.
+ */
+ ipath_write_kreg_port(dd,
+ dd->ipath_kregs->kr_rcvhdrtailaddr, port,
+ dd->ipath_dummy_hdrq_phys);
+ ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
+ pd->port_port, dd->ipath_dummy_hdrq_phys);
+
+ i = dd->ipath_pbufsport * (port - 1);
+ ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
+
+ if (dd->ipath_pageshadow)
+ unlock_expected_tids(pd);
+ ipath_stats.sps_ports--;
+ ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
+ pd->port_comm, pd->port_pid,
+ dd->ipath_unit, port);
+
+ dd->ipath_f_clear_tids(dd, pd->port_port);
}
pd->port_cnt = 0;
pd->port_pid = 0;
- dd->ipath_f_clear_tids(dd, pd->port_port);
-
dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */
mutex_unlock(&ipath_mutex);
ipath_free_pddata(dd, pd); /* after releasing the mutex */
diff --git a/drivers/infiniband/hw/ipath/ipath_init_chip.c b/drivers/infiniband/hw/ipath/ipath_init_chip.c
index 9faa201abe8..ff322e5c14c 100644
--- a/drivers/infiniband/hw/ipath/ipath_init_chip.c
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c
@@ -647,6 +647,7 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
u32 val32, kpiobufs;
u64 val;
struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
+ gfp_t gfp_flags = GFP_USER | __GFP_COMP;
ret = init_housekeeping(dd, &pd, reinit);
if (ret)
@@ -834,6 +835,22 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
else
enable_chip(dd, pd, reinit);
+
+ if (!ret && !reinit) {
+ /* used when we close a port, for DMA already in flight at close */
+ dd->ipath_dummy_hdrq = dma_alloc_coherent(
+ &dd->pcidev->dev, pd->port_rcvhdrq_size,
+ &dd->ipath_dummy_hdrq_phys,
+ gfp_flags);
+ if (!dd->ipath_dummy_hdrq ) {
+ dev_info(&dd->pcidev->dev,
+ "Couldn't allocate 0x%lx bytes for dummy hdrq\n",
+ pd->port_rcvhdrq_size);
+ /* fallback to just 0'ing */
+ dd->ipath_dummy_hdrq_phys = 0UL;
+ }
+ }
+
/*
* cause retrigger of pending interrupts ignored during init,
* even if we had errors
diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index 00a6bbdbe95..e9f374fb641 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -352,6 +352,8 @@ struct ipath_devdata {
/* check for stale messages in rcv queue */
/* only allow one intr at a time. */
unsigned long ipath_rcv_pending;
+ void *ipath_dummy_hdrq; /* used after port close */
+ dma_addr_t ipath_dummy_hdrq_phys;
/*
* Shadow copies of registers; size indicates read access size.