rapidio: change inbound window size type to u64

Current definition of map_inb() mport operations callback uses u32 type
to specify required inbound window (IBW) size.  This is limiting factor
because existing hardware - tsi721 and fsl_rio, both support IBW size up
to 16GB.

Changing type of size parameter to u64 to allow IBW size configurations
larger than 4GB.

[alexandre.bounine@idt.com: remove compiler warning about size of constant]
  Link: http://lkml.kernel.org/r/20160802184856.2566-1-alexandre.bounine@idt.com
Link: http://lkml.kernel.org/r/1469125134-16523-11-git-send-email-alexandre.bounine@idt.com
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 12 insertions, 8 deletions

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index f5bf38b94595..386790cfa16e 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -289,7 +289,7 @@ static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
 }
 
 int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
-        u64 rstart, u32 size, u32 flags)
+        u64 rstart, u64 size, u32 flags)
 {
         struct rio_priv *priv = mport->priv;
         u32 base_size;
@@ -298,7 +298,7 @@ int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
         u32 riwar;
         int i;
 
-        if ((size & (size - 1)) != 0)
+        if ((size & (size - 1)) != 0 || size > 0x400000000ULL)
                 return -EINVAL;
 
         base_size_log = ilog2(size);
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index 8e07cd56abdc..53daf634a1ac 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -1090,7 +1090,7 @@ static void tsi721_init_pc2sr_mapping(struct tsi721_device *priv)
  * from rstart to lstart.
  */
 static int tsi721_rio_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
-                u64 rstart, u32 size, u32 flags)
+                u64 rstart, u64 size, u32 flags)
 {
         struct tsi721_device *priv = mport->priv;
         int i, avail = -1;
@@ -1103,6 +1103,10 @@ static int tsi721_rio_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
         struct tsi721_ib_win_mapping *map = NULL;
         int ret = -EBUSY;
 
+        /* Max IBW size supported by HW is 16GB */
+        if (size > 0x400000000UL)
+                return -EINVAL;
+
         if (direct) {
                 /* Calculate minimal acceptable window size and base address */
 
@@ -1110,15 +1114,15 @@ static int tsi721_rio_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
                 ibw_start = lstart & ~(ibw_size - 1);
 
                 tsi_debug(IBW, &priv->pdev->dev,
-                        "Direct (RIO_0x%llx -> PCIe_%pad), size=0x%x, ibw_start = 0x%llx",
+                        "Direct (RIO_0x%llx -> PCIe_%pad), size=0x%llx, ibw_start = 0x%llx",
                         rstart, &lstart, size, ibw_start);
 
                 while ((lstart + size) > (ibw_start + ibw_size)) {
                         ibw_size *= 2;
                         ibw_start = lstart & ~(ibw_size - 1);
-                        if (ibw_size > 0x80000000) { /* Limit max size to 2GB */
+                        /* Check for crossing IBW max size 16GB */
+                        if (ibw_size > 0x400000000UL)
                                 return -EBUSY;
-                        }
                 }
 
                 loc_start = ibw_start;
@@ -1129,7 +1133,7 @@ static int tsi721_rio_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
 
         } else {
                 tsi_debug(IBW, &priv->pdev->dev,
-                        "Translated (RIO_0x%llx -> PCIe_%pad), size=0x%x",
+                        "Translated (RIO_0x%llx -> PCIe_%pad), size=0x%llx",
                         rstart, &lstart, size);
 
                 if (!is_power_of_2(size) || size < 0x1000 ||
diff --git a/include/linux/rio.h b/include/linux/rio.h
index aa2323893e8d..f7ec35b48800 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -425,7 +425,7 @@ struct rio_ops {
         int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
         void *(*get_inb_message)(struct rio_mport *mport, int mbox);
         int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
-                        u64 rstart, u32 size, u32 flags);
+                        u64 rstart, u64 size, u32 flags);
         void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
         int (*query_mport)(struct rio_mport *mport,
                            struct rio_mport_attr *attr);