Thread (3 messages) 3 messages, 3 authors, 2016-03-07

[PATCH] ntb: perf test: fix address space confusion

From: dave.jiang@intel.com (Jiang, Dave)
Date: 2016-01-26 18:20:18
Also in: lkml

On Tue, 2016-01-26 at 10:31 +0100, Arnd Bergmann wrote:
The ntb driver assigns between pointers an __iomem tokens, and
also casts them to 64-bit integers, which results in compiler
warnings on 32-bit systems:

drivers/ntb/test/ntb_perf.c: In function 'perf_copy':
drivers/ntb/test/ntb_perf.c:213:10: error: cast from pointer to
integer of different size [-Werror=pointer-to-int-cast]
? vbase = (u64)(u64 *)mw->vbase;
??????????^
drivers/ntb/test/ntb_perf.c:214:14: error: cast from pointer to
integer of different size [-Werror=pointer-to-int-cast]
? dst_vaddr = (u64)(u64 *)dst;
??????????????^

This adds __iomem annotations where needed and changes the temporary
variables to iomem pointers to avoid casting them to u64. I did not
see the problem in linux-next earlier, but it show showed up in
4.5-rc1.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dave Jiang <dave.jiang@intel.com>
quoted hunk ↗ jump to hunk
Fixes: 8a7b6a778a85 ("ntb: ntb perf tool")
---
?drivers/ntb/test/ntb_perf.c | 21 +++++++++++----------
?1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/ntb/test/ntb_perf.c
b/drivers/ntb/test/ntb_perf.c
index c8a37ba4b4f9..6bdc1e7b7503 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -178,7 +178,7 @@ static void perf_copy_callback(void *data)
?	atomic_dec(&pctx->dma_sync);
?}
?
-static ssize_t perf_copy(struct pthr_ctx *pctx, char *dst,
+static ssize_t perf_copy(struct pthr_ctx *pctx, char __iomem *dst,
?			?char *src, size_t size)
?{
?	struct perf_ctx *perf = pctx->perf;
@@ -189,7 +189,8 @@ static ssize_t perf_copy(struct pthr_ctx *pctx,
char *dst,
?	dma_cookie_t cookie;
?	size_t src_off, dst_off;
?	struct perf_mw *mw = &perf->mw;
-	u64 vbase, dst_vaddr;
+	void __iomem *vbase;
+	void __iomem *dst_vaddr;
?	dma_addr_t dst_phys;
?	int retries = 0;
?
@@ -204,14 +205,14 @@ static ssize_t perf_copy(struct pthr_ctx *pctx,
char *dst,
?	}
?
?	device = chan->device;
-	src_off = (size_t)src & ~PAGE_MASK;
-	dst_off = (size_t)dst & ~PAGE_MASK;
+	src_off = (uintptr_t)src & ~PAGE_MASK;
+	dst_off = (uintptr_t __force)dst & ~PAGE_MASK;
?
?	if (!is_dma_copy_aligned(device, src_off, dst_off, size))
?		return -ENODEV;
?
-	vbase = (u64)(u64 *)mw->vbase;
-	dst_vaddr = (u64)(u64 *)dst;
+	vbase = mw->vbase;
+	dst_vaddr = dst;
?	dst_phys = mw->phys_addr + (dst_vaddr - vbase);
?
?	unmap = dmaengine_get_unmap_data(device->dev, 1,
GFP_NOWAIT);
@@ -261,13 +262,13 @@ err_get_unmap:
?	return 0;
?}
?
-static int perf_move_data(struct pthr_ctx *pctx, char *dst, char
*src,
+static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst,
char *src,
?			??u64 buf_size, u64 win_size, u64 total)
?{
?	int chunks, total_chunks, i;
?	int copied_chunks = 0;
?	u64 copied = 0, result;
-	char *tmp = dst;
+	char __iomem *tmp = dst;
?	u64 perf, diff_us;
?	ktime_t kstart, kstop, kdiff;
?
@@ -324,7 +325,7 @@ static int ntb_perf_thread(void *data)
?	struct perf_ctx *perf = pctx->perf;
?	struct pci_dev *pdev = perf->ntb->pdev;
?	struct perf_mw *mw = &perf->mw;
-	char *dst;
+	char __iomem *dst;
?	u64 win_size, buf_size, total;
?	void *src;
?	int rc, node, i;
@@ -364,7 +365,7 @@ static int ntb_perf_thread(void *data)
?	if (buf_size > MAX_TEST_SIZE)
?		buf_size = MAX_TEST_SIZE;
?
-	dst = (char *)mw->vbase;
+	dst = (char __iomem *)mw->vbase;
?
?	atomic_inc(&perf->tsync);
?	while (atomic_read(&perf->tsync) != perf->perf_threads)
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help