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Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
-rw-r--r--arch/x86/kernel/pci-dma.c148
1 files changed, 59 insertions, 89 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 75e14e21f61..a25e202bb31 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -1,7 +1,9 @@
#include <linux/dma-mapping.h>
#include <linux/dma-debug.h>
#include <linux/dmar.h>
+#include <linux/export.h>
#include <linux/bootmem.h>
+#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/kmemleak.h>
@@ -10,8 +12,8 @@
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/calgary.h>
-#include <asm/amd_iommu.h>
#include <asm/x86_init.h>
+#include <asm/iommu_table.h>
static int forbid_dac __read_mostly;
@@ -38,11 +40,13 @@ int iommu_detected __read_mostly = 0;
* This variable becomes 1 if iommu=pt is passed on the kernel command line.
* If this variable is 1, IOMMU implementations do no DMA translation for
* devices and allow every device to access to whole physical memory. This is
- * useful if a user want to use an IOMMU only for KVM device assignment to
+ * useful if a user wants to use an IOMMU only for KVM device assignment to
* guests and not for driver dma translation.
*/
int iommu_pass_through __read_mostly;
+extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
+
/* Dummy device used for NULL arguments (normally ISA). */
struct device x86_dma_fallback_dev = {
.init_name = "fallback device",
@@ -52,7 +56,7 @@ struct device x86_dma_fallback_dev = {
EXPORT_SYMBOL(x86_dma_fallback_dev);
/* Number of entries preallocated for DMA-API debugging */
-#define PREALLOC_DMA_DEBUG_ENTRIES 32768
+#define PREALLOC_DMA_DEBUG_ENTRIES 65536
int dma_set_mask(struct device *dev, u64 mask)
{
@@ -65,92 +69,48 @@ int dma_set_mask(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(dma_set_mask);
-#ifdef CONFIG_X86_64
-static __initdata void *dma32_bootmem_ptr;
-static unsigned long dma32_bootmem_size __initdata = (128ULL<<20);
-
-static int __init parse_dma32_size_opt(char *p)
-{
- if (!p)
- return -EINVAL;
- dma32_bootmem_size = memparse(p, &p);
- return 0;
-}
-early_param("dma32_size", parse_dma32_size_opt);
-
-void __init dma32_reserve_bootmem(void)
-{
- unsigned long size, align;
- if (max_pfn <= MAX_DMA32_PFN)
- return;
-
- /*
- * check aperture_64.c allocate_aperture() for reason about
- * using 512M as goal
- */
- align = 64ULL<<20;
- size = roundup(dma32_bootmem_size, align);
- dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
- 512ULL<<20);
- /*
- * Kmemleak should not scan this block as it may not be mapped via the
- * kernel direct mapping.
- */
- kmemleak_ignore(dma32_bootmem_ptr);
- if (dma32_bootmem_ptr)
- dma32_bootmem_size = size;
- else
- dma32_bootmem_size = 0;
-}
-static void __init dma32_free_bootmem(void)
-{
-
- if (max_pfn <= MAX_DMA32_PFN)
- return;
-
- if (!dma32_bootmem_ptr)
- return;
-
- free_bootmem(__pa(dma32_bootmem_ptr), dma32_bootmem_size);
-
- dma32_bootmem_ptr = NULL;
- dma32_bootmem_size = 0;
-}
-#endif
-
void __init pci_iommu_alloc(void)
{
-#ifdef CONFIG_X86_64
- /* free the range so iommu could get some range less than 4G */
- dma32_free_bootmem();
-#endif
- if (pci_swiotlb_detect())
- goto out;
-
- gart_iommu_hole_init();
-
- detect_calgary();
-
- detect_intel_iommu();
-
- /* needs to be called after gart_iommu_hole_init */
- amd_iommu_detect();
-out:
- pci_swiotlb_init();
+ struct iommu_table_entry *p;
+
+ sort_iommu_table(__iommu_table, __iommu_table_end);
+ check_iommu_entries(__iommu_table, __iommu_table_end);
+
+ for (p = __iommu_table; p < __iommu_table_end; p++) {
+ if (p && p->detect && p->detect() > 0) {
+ p->flags |= IOMMU_DETECTED;
+ if (p->early_init)
+ p->early_init();
+ if (p->flags & IOMMU_FINISH_IF_DETECTED)
+ break;
+ }
+ }
}
-
void *dma_generic_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_addr, gfp_t flag)
+ dma_addr_t *dma_addr, gfp_t flag,
+ struct dma_attrs *attrs)
{
unsigned long dma_mask;
struct page *page;
+ unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
dma_addr_t addr;
dma_mask = dma_alloc_coherent_mask(dev, flag);
- flag |= __GFP_ZERO;
+ flag &= ~__GFP_ZERO;
again:
- page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
+ page = NULL;
+ /* CMA can be used only in the context which permits sleeping */
+ if (flag & __GFP_WAIT) {
+ page = dma_alloc_from_contiguous(dev, count, get_order(size));
+ if (page && page_to_phys(page) + size > dma_mask) {
+ dma_release_from_contiguous(dev, page, count);
+ page = NULL;
+ }
+ }
+ /* fallback */
+ if (!page)
+ page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
if (!page)
return NULL;
@@ -165,14 +125,24 @@ again:
return NULL;
}
-
+ memset(page_address(page), 0, size);
*dma_addr = addr;
return page_address(page);
}
+void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_addr, struct dma_attrs *attrs)
+{
+ unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+ struct page *page = virt_to_page(vaddr);
+
+ if (!dma_release_from_contiguous(dev, page, count))
+ free_pages((unsigned long)vaddr, get_order(size));
+}
+
/*
- * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
- * documentation.
+ * See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel
+ * parameter documentation.
*/
static __init int iommu_setup(char *p)
{
@@ -281,6 +251,7 @@ EXPORT_SYMBOL(dma_supported);
static int __init pci_iommu_init(void)
{
+ struct iommu_table_entry *p;
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
#ifdef CONFIG_PCI
@@ -288,12 +259,10 @@ static int __init pci_iommu_init(void)
#endif
x86_init.iommu.iommu_init();
- if (swiotlb) {
- printk(KERN_INFO "PCI-DMA: "
- "Using software bounce buffering for IO (SWIOTLB)\n");
- swiotlb_print_info();
- } else
- swiotlb_free();
+ for (p = __iommu_table; p < __iommu_table_end; p++) {
+ if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
+ p->late_init();
+ }
return 0;
}
@@ -303,12 +272,13 @@ rootfs_initcall(pci_iommu_init);
#ifdef CONFIG_PCI
/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
-static __devinit void via_no_dac(struct pci_dev *dev)
+static void via_no_dac(struct pci_dev *dev)
{
- if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+ if (forbid_dac == 0) {
dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
forbid_dac = 1;
}
}
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
+ PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:45:56 +0000