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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 14/15] [swiotlb] Move initialization (swiotlb_init) and its friends in swiotlb-default.c
We move all of the initialization functions and as well
all functions defined in the swiotlb_ops to a seperate file.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
lib/Makefile | 2 +-
lib/swiotlb-default.c | 242 +++++++++++++++++++++++++++++++++++++++++++++++++
lib/swiotlb.c | 231 +----------------------------------------------
3 files changed, 245 insertions(+), 230 deletions(-)
create mode 100644 lib/swiotlb-default.c
diff --git a/lib/Makefile b/lib/Makefile
index 347ad8d..fd96891 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -77,7 +77,7 @@ obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
obj-$(CONFIG_SMP) += percpu_counter.o
obj-$(CONFIG_AUDIT_GENERIC) += audit.o
-obj-$(CONFIG_SWIOTLB) += swiotlb.o
+obj-$(CONFIG_SWIOTLB) += swiotlb.o swiotlb-default.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
diff --git a/lib/swiotlb-default.c b/lib/swiotlb-default.c
new file mode 100644
index 0000000..c490fcf
--- /dev/null
+++ b/lib/swiotlb-default.c
@@ -0,0 +1,242 @@
+
+#include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
+#include <linux/bootmem.h>
+
+
+#define OFFSET(val, align) ((unsigned long) \
+ (val) & ((align) - 1))
+
+#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
+
+/*
+ * Minimum IO TLB size to bother booting with. Systems with mainly
+ * 64bit capable cards will only lightly use the swiotlb. If we can't
+ * allocate a contiguous 1MB, we're probably in trouble anyway.
+ */
+#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+
+/* Note that this doesn't work with highmem page */
+static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
+ void *address)
+{
+ return phys_to_dma(hwdev, virt_to_phys(address));
+}
+
+static void *swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t dev_addr)
+{
+ return phys_to_virt(dma_to_phys(hwdev, dev_addr));
+};
+
+/*
+ * Statically reserve bounce buffer space and initialize bounce buffer data
+ * structures for the software IO TLB used to implement the DMA API.
+ */
+void __init
+swiotlb_init_with_default_size(struct swiotlb_engine *iommu_sw,
+ size_t default_size, int verbose)
+{
+ unsigned long i, bytes;
+
+ if (!swiotlb_nslabs) {
+ iommu_sw->nslabs = (default_size >> IO_TLB_SHIFT);
+ iommu_sw->nslabs = ALIGN(iommu_sw->nslabs, IO_TLB_SEGSIZE);
+ } else
+ iommu_sw->nslabs = swiotlb_nslabs;
+
+ bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
+
+ /*
+ * Get IO TLB memory from the low pages
+ */
+ iommu_sw->start = alloc_bootmem_low_pages(bytes);
+ if (!iommu_sw->start)
+ panic("Cannot allocate SWIOTLB buffer");
+ iommu_sw->end = iommu_sw->start + bytes;
+
+ /*
+ * Allocate and initialize the free list array. This array is used
+ * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
+ * between iommu_sw->start and iommu_sw->end.
+ */
+ iommu_sw->list = alloc_bootmem(iommu_sw->nslabs * sizeof(int));
+ for (i = 0; i < iommu_sw->nslabs; i++)
+ iommu_sw->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ iommu_sw->index = 0;
+ iommu_sw->orig_addr = alloc_bootmem(iommu_sw->nslabs *
+ sizeof(phys_addr_t));
+
+ /*
+ * Get the overflow emergency buffer
+ */
+ iommu_sw->overflow_buffer = alloc_bootmem_low(iommu_sw->overflow);
+ if (!iommu_sw->overflow_buffer)
+ panic("Cannot allocate SWIOTLB overflow buffer!\n");
+ if (verbose)
+ swiotlb_print_info();
+
+ iommu_sw->priv = NULL;
+}
+
+int swiotlb_release(struct swiotlb_engine *iommu_sw)
+{
+ if (!iommu_sw)
+ return -ENODEV;
+
+ if (iommu_sw->priv) {
+ free_pages((unsigned long)iommu_sw->overflow_buffer,
+ get_order(iommu_sw->overflow));
+ free_pages((unsigned long)iommu_sw->orig_addr,
+ get_order(iommu_sw->nslabs * sizeof(phys_addr_t)));
+ free_pages((unsigned long)iommu_sw->list,
+ get_order(iommu_sw->nslabs * sizeof(int)));
+ free_pages((unsigned long)iommu_sw->start,
+ get_order(iommu_sw->nslabs << IO_TLB_SHIFT));
+ } else {
+ free_bootmem_late(__pa(iommu_sw->overflow_buffer),
+ iommu_sw->overflow);
+ free_bootmem_late(__pa(iommu_sw->orig_addr),
+ iommu_sw->nslabs * sizeof(phys_addr_t));
+ free_bootmem_late(__pa(iommu_sw->list),
+ iommu_sw->nslabs * sizeof(int));
+ free_bootmem_late(__pa(iommu_sw->start),
+ iommu_sw->nslabs << IO_TLB_SHIFT);
+ }
+ return 0;
+}
+
+static int is_swiotlb_buffer(struct swiotlb_engine *iommu_sw,
+ dma_addr_t dma_addr, phys_addr_t paddr)
+{
+ return paddr >= virt_to_phys(iommu_sw->start) &&
+ paddr < virt_to_phys(iommu_sw->end);
+}
+
+static bool swiotlb_dma_capable(struct device *hwdev, dma_addr_t dma_addr,
+ phys_addr_t phys, size_t size)
+{
+ /* Phys is not neccessary in this case. */
+ return dma_capable(hwdev, dma_addr, size);
+}
+static struct swiotlb_engine swiotlb_ops = {
+ .name = "software IO TLB",
+ .overflow = 32 * 1024,
+ .release = swiotlb_release,
+ .dma_capable = swiotlb_dma_capable,
+ .is_swiotlb_buffer = is_swiotlb_buffer,
+ .phys_to_bus = phys_to_dma,
+ .bus_to_phys = dma_to_phys,
+ .virt_to_bus = swiotlb_virt_to_bus,
+ .bus_to_virt = swiotlb_bus_to_virt,
+};
+
+void __init
+swiotlb_init(int verbose)
+{
+ swiotlb_register_engine(&swiotlb_ops);
+ swiotlb_init_with_default_size(&swiotlb_ops, 64 * (1<<20),
+ verbose); /* default to 64MB */
+}
+
+/*
+ * Systems with larger DMA zones (those that don't support ISA) can
+ * initialize the swiotlb later using the slab allocator if needed.
+ * This should be just like above, but with some error catching.
+ */
+int
+swiotlb_late_init_with_default_size(struct swiotlb_engine *iommu_sw,
+ size_t default_size)
+{
+ unsigned long i, bytes, req_nslabs = iommu_sw->nslabs;
+ unsigned int order;
+
+ if (!swiotlb_nslabs) {
+ iommu_sw->nslabs = (default_size >> IO_TLB_SHIFT);
+ iommu_sw->nslabs = ALIGN(iommu_sw->nslabs, IO_TLB_SEGSIZE);
+ } else
+ iommu_sw->nslabs = swiotlb_nslabs;
+
+ /*
+ * Get IO TLB memory from the low pages
+ */
+ order = get_order(iommu_sw->nslabs << IO_TLB_SHIFT);
+ iommu_sw->nslabs = SLABS_PER_PAGE << order;
+ bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
+
+ while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
+ iommu_sw->start = (void *)__get_free_pages(GFP_DMA |
+ __GFP_NOWARN, order);
+ if (iommu_sw->start)
+ break;
+ order--;
+ }
+
+ if (!iommu_sw->start)
+ goto cleanup1;
+
+ if (order != get_order(bytes)) {
+ printk(KERN_WARNING "Warning: only able to allocate %ld MB "
+ "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
+ iommu_sw->nslabs = SLABS_PER_PAGE << order;
+ bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
+ }
+ iommu_sw->end = iommu_sw->start + bytes;
+ memset(iommu_sw->start, 0, bytes);
+
+ /*
+ * Allocate and initialize the free list array. This array is used
+ * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
+ * between iommu_sw->start and iommu_sw->end.
+ */
+ iommu_sw->list = (unsigned int *)__get_free_pages(GFP_KERNEL,
+ get_order(iommu_sw->nslabs * sizeof(int)));
+ if (!iommu_sw->list)
+ goto cleanup2;
+
+ for (i = 0; i < iommu_sw->nslabs; i++)
+ iommu_sw->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ iommu_sw->index = 0;
+
+ iommu_sw->orig_addr = (phys_addr_t *)
+ __get_free_pages(GFP_KERNEL,
+ get_order(iommu_sw->nslabs *
+ sizeof(phys_addr_t)));
+ if (!iommu_sw->orig_addr)
+ goto cleanup3;
+
+ memset(iommu_sw->orig_addr, 0, iommu_sw->nslabs * sizeof(phys_addr_t));
+
+ /*
+ * Get the overflow emergency buffer
+ */
+ iommu_sw->overflow_buffer = (void *)__get_free_pages(GFP_DMA,
+ get_order(iommu_sw->overflow));
+ if (!iommu_sw->overflow_buffer)
+ goto cleanup4;
+
+ swiotlb_print_info();
+
+ /* We utilize the private field to figure out whether we
+ * were allocated late or early.
+ */
+ iommu_sw->priv = (void *)1;
+
+ return 0;
+
+cleanup4:
+ free_pages((unsigned long)iommu_sw->orig_addr,
+ get_order(iommu_sw->nslabs * sizeof(phys_addr_t)));
+ iommu_sw->orig_addr = NULL;
+cleanup3:
+ free_pages((unsigned long)iommu_sw->list, get_order(iommu_sw->nslabs *
+ sizeof(int)));
+ iommu_sw->list = NULL;
+cleanup2:
+ iommu_sw->end = NULL;
+ free_pages((unsigned long)iommu_sw->start, order);
+ iommu_sw->start = NULL;
+cleanup1:
+ iommu_sw->nslabs = req_nslabs;
+ return -ENOMEM;
+}
+
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 8e65cee..9e72d21 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -40,14 +40,6 @@
#define OFFSET(val,align) ((unsigned long) \
( (val) & ( (align) - 1)))
-#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
-
-/*
- * Minimum IO TLB size to bother booting with. Systems with mainly
- * 64bit capable cards will only lightly use the swiotlb. If we can't
- * allocate a contiguous 1MB, we're probably in trouble anyway.
- */
-#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
/*
* Enumeration for sync targets
@@ -96,18 +88,6 @@ setup_io_tlb_npages(char *str)
__setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
-/* Note that this doesn't work with highmem page */
-static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
- void *address)
-{
- return phys_to_dma(hwdev, virt_to_phys(address));
-}
-
-static void *swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t dev_addr)
-{
- return phys_to_virt(dma_to_phys(hwdev, dev_addr));
-};
-
/*
* Register a software IO TLB engine.
*
@@ -165,220 +145,13 @@ void swiotlb_print_info(void)
(unsigned long long)pend);
}
-/*
- * Statically reserve bounce buffer space and initialize bounce buffer data
- * structures for the software IO TLB used to implement the DMA API.
- */
-void __init
-swiotlb_init_with_default_size(size_t default_size, int verbose)
-{
- unsigned long i, bytes;
-
- if (!swiotlb_nslabs) {
- iommu_sw->nslabs = (default_size >> IO_TLB_SHIFT);
- iommu_sw->nslabs = ALIGN(iommu_sw->nslabs, IO_TLB_SEGSIZE);
- } else
- iommu_sw->nslabs = swiotlb_nslabs;
-
- bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
-
- /*
- * Get IO TLB memory from the low pages
- */
- iommu_sw->start = alloc_bootmem_low_pages(bytes);
- if (!iommu_sw->start)
- panic("Cannot allocate SWIOTLB buffer");
- iommu_sw->end = iommu_sw->start + bytes;
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between iommu_sw->start and iommu_sw->end.
- */
- iommu_sw->list = alloc_bootmem(iommu_sw->nslabs * sizeof(int));
- for (i = 0; i < iommu_sw->nslabs; i++)
- iommu_sw->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- iommu_sw->index = 0;
- iommu_sw->orig_addr = alloc_bootmem(iommu_sw->nslabs *
- sizeof(phys_addr_t));
-
- /*
- * Get the overflow emergency buffer
- */
- iommu_sw->overflow_buffer = alloc_bootmem_low(iommu_sw->overflow);
- if (!iommu_sw->overflow_buffer)
- panic("Cannot allocate SWIOTLB overflow buffer!\n");
- if (verbose)
- swiotlb_print_info();
-
- iommu_sw->priv = NULL;
-}
-
-static int swiotlb_release(struct swiotlb_engine *iotlb)
-{
- swiotlb_free();
- return 0;
-}
-static int is_swiotlb_buffer(struct swiotlb_engine *iommu_sw,
- dma_addr_t dev_addr, phys_addr_t paddr)
-{
- return paddr >= virt_to_phys(iommu_sw->start) &&
- paddr < virt_to_phys(iommu_sw->end);
-}
-
-static bool swiotlb_dma_capable(struct device *hwdev, dma_addr_t dma_addr,
- phys_addr_t phys, size_t size)
-{
- /* Phys is not neccessary in this case. */
- return dma_capable(hwdev, dma_addr, size);
-}
-
-static struct swiotlb_engine swiotlb_ops = {
- .name = "software IO TLB",
- .overflow = 32 * 1024,
- .release = swiotlb_release,
- .dma_capable = swiotlb_dma_capable,
- .is_swiotlb_buffer = is_swiotlb_buffer,
- .phys_to_bus = phys_to_dma,
- .bus_to_phys = dma_to_phys,
- .virt_to_bus = swiotlb_virt_to_bus,
- .bus_to_virt = swiotlb_bus_to_virt,
-};
-
-void __init
-swiotlb_init(int verbose)
-{
- swiotlb_register_engine(&swiotlb_ops);
- swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to
64MB */
-}
-
-/*
- * Systems with larger DMA zones (those that don't support ISA) can
- * initialize the swiotlb later using the slab allocator if needed.
- * This should be just like above, but with some error catching.
- */
-int
-swiotlb_late_init_with_default_size(size_t default_size)
-{
- unsigned long i, bytes, req_nslabs = iommu_sw->nslabs;
- unsigned int order;
-
- if (!swiotlb_nslabs) {
- iommu_sw->nslabs = (default_size >> IO_TLB_SHIFT);
- iommu_sw->nslabs = ALIGN(iommu_sw->nslabs, IO_TLB_SEGSIZE);
- } else
- iommu_sw->nslabs = swiotlb_nslabs;
-
- /*
- * Get IO TLB memory from the low pages
- */
- order = get_order(iommu_sw->nslabs << IO_TLB_SHIFT);
- iommu_sw->nslabs = SLABS_PER_PAGE << order;
- bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
-
- while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
- iommu_sw->start = (void *)__get_free_pages(GFP_DMA |
- __GFP_NOWARN, order);
- if (iommu_sw->start)
- break;
- order--;
- }
-
- if (!iommu_sw->start)
- goto cleanup1;
-
- if (order != get_order(bytes)) {
- printk(KERN_WARNING "Warning: only able to allocate %ld MB "
- "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
- iommu_sw->nslabs = SLABS_PER_PAGE << order;
- bytes = iommu_sw->nslabs << IO_TLB_SHIFT;
- }
- iommu_sw->end = iommu_sw->start + bytes;
- memset(iommu_sw->start, 0, bytes);
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between iommu_sw->start and iommu_sw->end.
- */
- iommu_sw->list = (unsigned int *)__get_free_pages(GFP_KERNEL,
- get_order(iommu_sw->nslabs * sizeof(int)));
- if (!iommu_sw->list)
- goto cleanup2;
-
- for (i = 0; i < iommu_sw->nslabs; i++)
- iommu_sw->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- iommu_sw->index = 0;
-
- iommu_sw->orig_addr = (phys_addr_t *)
- __get_free_pages(GFP_KERNEL,
- get_order(iommu_sw->nslabs *
- sizeof(phys_addr_t)));
- if (!iommu_sw->orig_addr)
- goto cleanup3;
-
- memset(iommu_sw->orig_addr, 0, iommu_sw->nslabs * sizeof(phys_addr_t));
-
- /*
- * Get the overflow emergency buffer
- */
- iommu_sw->overflow_buffer = (void *)__get_free_pages(GFP_DMA,
- get_order(iommu_sw->overflow));
- if (!iommu_sw->overflow_buffer)
- goto cleanup4;
-
- swiotlb_print_info();
-
- /* We utilize the private field to figure out whether we
- * were allocated late or early.
- */
- iommu_sw->priv = (void *)1;
-
- return 0;
-
-cleanup4:
- free_pages((unsigned long)iommu_sw->orig_addr,
- get_order(iommu_sw->nslabs * sizeof(phys_addr_t)));
- iommu_sw->orig_addr = NULL;
-cleanup3:
- free_pages((unsigned long)iommu_sw->list, get_order(iommu_sw->nslabs *
- sizeof(int)));
- iommu_sw->list = NULL;
-cleanup2:
- iommu_sw->end = NULL;
- free_pages((unsigned long)iommu_sw->start, order);
- iommu_sw->start = NULL;
-cleanup1:
- iommu_sw->nslabs = req_nslabs;
- return -ENOMEM;
-}
-
void __init swiotlb_free(void)
{
if (!iommu_sw)
return;
- if (iommu_sw->priv) {
- free_pages((unsigned long)iommu_sw->overflow_buffer,
- get_order(iommu_sw->overflow));
- free_pages((unsigned long)iommu_sw->orig_addr,
- get_order(iommu_sw->nslabs * sizeof(phys_addr_t)));
- free_pages((unsigned long)iommu_sw->list,
- get_order(iommu_sw->nslabs * sizeof(int)));
- free_pages((unsigned long)iommu_sw->start,
- get_order(iommu_sw->nslabs << IO_TLB_SHIFT));
- } else {
- free_bootmem_late(__pa(iommu_sw->overflow_buffer),
- iommu_sw->overflow);
- free_bootmem_late(__pa(iommu_sw->orig_addr),
- iommu_sw->nslabs * sizeof(phys_addr_t));
- free_bootmem_late(__pa(iommu_sw->list),
- iommu_sw->nslabs * sizeof(int));
- free_bootmem_late(__pa(iommu_sw->start),
- iommu_sw->nslabs << IO_TLB_SHIFT);
- }
-}
-
+ iommu_sw->release(iommu_sw);
+};
/*
* Bounce: copy the swiotlb buffer back to the original dma location
--
1.6.2.5
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