swiotlb: Defer swiotlb init printing, export swiotlb_print_info()

This enables us to avoid printing swiotlb memory info when we
initialize swiotlb. After swiotlb initialization, we could find
that we don't need swiotlb.

This patch removes the code to print swiotlb memory info in
swiotlb_init() and exports the function to do that.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: chrisw@sous-sol.org
Cc: dwmw2@infradead.org
Cc: joerg.roedel@amd.com
Cc: muli@il.ibm.com
Cc: tony.luck@intel.com
Cc: benh@kernel.crashing.org
LKML-Reference: <1257849980-22640-9-git-send-email-fujita.tomonori@lab.ntt.co.jp>
[ -v2: merge up conflict ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 15 insertions, 15 deletions

diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
index 285aae8431c6..53292abf846c 100644
--- a/arch/ia64/kernel/pci-swiotlb.c
+++ b/arch/ia64/kernel/pci-swiotlb.c
@@ -41,7 +41,7 @@ struct dma_map_ops swiotlb_dma_ops = {
 void __init swiotlb_dma_init(void)
 {
         dma_ops = &swiotlb_dma_ops;
-        swiotlb_init();
+        swiotlb_init(1);
 }
 
 void __init pci_swiotlb_init(void)
@@ -51,7 +51,7 @@ void __init pci_swiotlb_init(void)
                 swiotlb = 1;
                 printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
                 machvec_init("dig");
-                swiotlb_init();
+                swiotlb_init(1);
                 dma_ops = &swiotlb_dma_ops;
 #else
                 panic("Unable to find Intel IOMMU");
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 53bcf3d792db..b152de3e64d4 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -345,7 +345,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_SWIOTLB
         if (ppc_swiotlb_enable)
-                swiotlb_init();
+                swiotlb_init(1);
 #endif
 
         paging_init();
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 04f638d82fb3..df2c9e932b37 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -550,7 +550,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_SWIOTLB
         if (ppc_swiotlb_enable)
-                swiotlb_init();
+                swiotlb_init(1);
 #endif
 
         paging_init();
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index aaa6b7839f1e..ea20ef7ca523 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -52,8 +52,7 @@ void __init pci_swiotlb_init(void)
         if (swiotlb_force)
                 swiotlb = 1;
         if (swiotlb) {
-                printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
-                swiotlb_init();
+                swiotlb_init(0);
                 dma_ops = &swiotlb_dma_ops;
         }
 }
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 59bafa690290..eb9bdb4d4854 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -20,8 +20,7 @@ struct scatterlist;
  */
 #define IO_TLB_SHIFT 11
 
-extern void
-swiotlb_init(void);
+extern void swiotlb_init(int verbose);
 
 extern void
 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
@@ -94,4 +93,5 @@ extern void __init swiotlb_free(void);
 static inline void swiotlb_free(void) { }
 #endif
 
+extern void swiotlb_print_info(void);
 #endif /* __LINUX_SWIOTLB_H */
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index eee512b63f17..0c12d7cce300 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -123,8 +123,9 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
         return phys_to_dma(hwdev, virt_to_phys(address));
 }
 
-static void swiotlb_print_info(unsigned long bytes)
+void swiotlb_print_info(void)
 {
+        unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
         phys_addr_t pstart, pend;
 
         pstart = virt_to_phys(io_tlb_start);
@@ -142,7 +143,7 @@ static void swiotlb_print_info(unsigned long bytes)
  * structures for the software IO TLB used to implement the DMA API.
  */
 void __init
-swiotlb_init_with_default_size(size_t default_size)
+swiotlb_init_with_default_size(size_t default_size, int verbose)
 {
         unsigned long i, bytes;
 
@@ -178,14 +179,14 @@ swiotlb_init_with_default_size(size_t default_size)
         io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
         if (!io_tlb_overflow_buffer)
                 panic("Cannot allocate SWIOTLB overflow buffer!\n");
-
-        swiotlb_print_info(bytes);
+        if (verbose)
+                swiotlb_print_info();
 }
 
 void __init
-swiotlb_init(void)
+swiotlb_init(int verbose)
 {
-        swiotlb_init_with_default_size(64 * (1<<20));   /* default to 64MB */
+        swiotlb_init_with_default_size(64 * (1<<20), verbose);  /* default to 64MB */
 }
 
 /*
@@ -262,7 +263,7 @@ swiotlb_late_init_with_default_size(size_t default_size)
         if (!io_tlb_overflow_buffer)
                 goto cleanup4;
 
-        swiotlb_print_info(bytes);
+        swiotlb_print_info();
 
         late_alloc = 1;