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Merge branch 'stable/late-swiotlb.v3.3' into stable/for-linus-3.7

Browse Source 
* stable/late-swiotlb.v3.3:
  xen/swiotlb: Fix compile warnings when using plain integer instead of NULL pointer.
  xen/swiotlb: Remove functions not needed anymore.
  xen/pcifront: Use Xen-SWIOTLB when initting if required.
  xen/swiotlb: For early initialization, return zero on success.
  xen/swiotlb: Use the swiotlb_late_init_with_tbl to init Xen-SWIOTLB late when PV PCI is used.
  xen/swiotlb: Move the error strings to its own function.
  xen/swiotlb: Move the nr_tbl determination in its own function.
  swiotlb: add the late swiotlb initialization function with iotlb memory
  xen/swiotlb: With more than 4GB on 64-bit, disable the native SWIOTLB.
  xen/swiotlb: Simplify the logic.

Conflicts:
	arch/x86/xen/pci-swiotlb-xen.c

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-09-22 20:01:16 -04:00
commit a5f9515570
7 changed files with 156 additions and 47 deletions
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2
arch/x86/include/asm/xen/swiotlb-xen.h
View File

@ -5,10 +5,12 @@
extern int xen_swiotlb;
extern int __init pci_xen_swiotlb_detect(void);
extern void __init pci_xen_swiotlb_init(void);
extern int pci_xen_swiotlb_init_late(void);
#else
#define xen_swiotlb (0)
static inline int __init pci_xen_swiotlb_detect(void) { return 0; }
static inline void __init pci_xen_swiotlb_init(void) { }
static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
#endif
#endif /* _ASM_X86_SWIOTLB_XEN_H */

47
arch/x86/xen/pci-swiotlb-xen.c
View File

@ -8,7 +8,14 @@
#include <xen/xen.h>
#include <asm/iommu_table.h>
#include <asm/xen/swiotlb-xen.h>
#ifdef CONFIG_X86_64
#include <asm/iommu.h>
#include <asm/dma.h>
#endif
#include <linux/export.h>
int xen_swiotlb __read_mostly;
static struct dma_map_ops xen_swiotlb_dma_ops = {
@ -35,33 +42,63 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
int __init pci_xen_swiotlb_detect(void)
{
if (!xen_pv_domain())
return 0;
/* If running as PV guest, either iommu=soft, or swiotlb=force will
* activate this IOMMU. If running as PV privileged, activate it
* irregardless.
*/
if ((xen_initial_domain() || swiotlb || swiotlb_force) &&
(xen_pv_domain()))
if ((xen_initial_domain() || swiotlb || swiotlb_force))
xen_swiotlb = 1;
/* If we are running under Xen, we MUST disable the native SWIOTLB.
* Don't worry about swiotlb_force flag activating the native, as
* the 'swiotlb' flag is the only one turning it on. */
if (xen_pv_domain())
swiotlb = 0;
swiotlb = 0;
#ifdef CONFIG_X86_64
/* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0
* (so no iommu=X command line over-writes).
* Considering that PV guests do not want the *native SWIOTLB* but
* only Xen SWIOTLB it is not useful to us so set no_iommu=1 here.
*/
if (max_pfn > MAX_DMA32_PFN)
no_iommu = 1;
#endif
return xen_swiotlb;
}
void __init pci_xen_swiotlb_init(void)
{
if (xen_swiotlb) {
xen_swiotlb_init(1);
xen_swiotlb_init(1, true /* early */);
dma_ops = &xen_swiotlb_dma_ops;
/* Make sure ACS will be enabled */
pci_request_acs();
}
}
int pci_xen_swiotlb_init_late(void)
{
int rc;
if (xen_swiotlb)
return 0;
rc = xen_swiotlb_init(1, false /* late */);
if (rc)
return rc;
dma_ops = &xen_swiotlb_dma_ops;
/* Make sure ACS will be enabled */
pci_request_acs();
return 0;
}
EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
NULL,
pci_xen_swiotlb_init,

13
drivers/pci/xen-pcifront.c
View File

@ -21,6 +21,7 @@
#include <linux/bitops.h>
#include <linux/time.h>
#include <asm/xen/swiotlb-xen.h>
#define INVALID_GRANT_REF (0)
#define INVALID_EVTCHN (-1)
@ -668,7 +669,7 @@ static irqreturn_t pcifront_handler_aer(int irq, void *dev)
schedule_pcifront_aer_op(pdev);
return IRQ_HANDLED;
}
static int pcifront_connect(struct pcifront_device *pdev)
static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
{
int err = 0;
@ -681,9 +682,13 @@ static int pcifront_connect(struct pcifront_device *pdev)
dev_err(&pdev->xdev->dev, "PCI frontend already installed!\n");
err = -EEXIST;
}
spin_unlock(&pcifront_dev_lock);
if (!err && !swiotlb_nr_tbl()) {
err = pci_xen_swiotlb_init_late();
if (err)
dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
}
return err;
}
@ -842,10 +847,10 @@ static int __devinit pcifront_try_connect(struct pcifront_device *pdev)
XenbusStateInitialised)
goto out;
err = pcifront_connect(pdev);
err = pcifront_connect_and_init_dma(pdev);
if (err) {
xenbus_dev_fatal(pdev->xdev, err,
"Error connecting PCI Frontend");
"Error setting up PCI Frontend");
goto out;
}

105
drivers/xen/swiotlb-xen.c
View File

@ -144,31 +144,72 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
} while (i < nslabs);
return 0;
}
void __init xen_swiotlb_init(int verbose)
static unsigned long xen_set_nslabs(unsigned long nr_tbl)
{
unsigned long bytes;
int rc = -ENOMEM;
unsigned long nr_tbl;
char *m = NULL;
unsigned int repeat = 3;
nr_tbl = swiotlb_nr_tbl();
if (nr_tbl)
xen_io_tlb_nslabs = nr_tbl;
else {
if (!nr_tbl) {
xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
}
retry:
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
} else
xen_io_tlb_nslabs = nr_tbl;
return xen_io_tlb_nslabs << IO_TLB_SHIFT;
}
enum xen_swiotlb_err {
XEN_SWIOTLB_UNKNOWN = 0,
XEN_SWIOTLB_ENOMEM,
XEN_SWIOTLB_EFIXUP
};
static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
{
switch (err) {
case XEN_SWIOTLB_ENOMEM:
return "Cannot allocate Xen-SWIOTLB buffer\n";
case XEN_SWIOTLB_EFIXUP:
return "Failed to get contiguous memory for DMA from Xen!\n"\
"You either: don't have the permissions, do not have"\
" enough free memory under 4GB, or the hypervisor memory"\
" is too fragmented!";
default:
break;
}
return "";
}
int __ref xen_swiotlb_init(int verbose, bool early)
{
unsigned long bytes, order;
int rc = -ENOMEM;
enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
unsigned int repeat = 3;
xen_io_tlb_nslabs = swiotlb_nr_tbl();
retry:
bytes = xen_set_nslabs(xen_io_tlb_nslabs);
order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT);
/*
* Get IO TLB memory from any location.
*/
xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes));
if (early)
xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes));
else {
#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
xen_io_tlb_start = (void *)__get_free_pages(__GFP_NOWARN, order);
if (xen_io_tlb_start)
break;
order--;
}
if (order != get_order(bytes)) {
pr_warn("Warning: only able to allocate %ld MB "
"for software IO TLB\n", (PAGE_SIZE << order) >> 20);
xen_io_tlb_nslabs = SLABS_PER_PAGE << order;
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
}
}
if (!xen_io_tlb_start) {
m = "Cannot allocate Xen-SWIOTLB buffer!\n";
m_ret = XEN_SWIOTLB_ENOMEM;
goto error;
}
xen_io_tlb_end = xen_io_tlb_start + bytes;
@ -179,17 +220,22 @@ void __init xen_swiotlb_init(int verbose)
bytes,
xen_io_tlb_nslabs);
if (rc) {
free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes));
m = "Failed to get contiguous memory for DMA from Xen!\n"\
"You either: don't have the permissions, do not have"\
" enough free memory under 4GB, or the hypervisor memory"\
"is too fragmented!";
if (early)
free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes));
else {
free_pages((unsigned long)xen_io_tlb_start, order);
xen_io_tlb_start = NULL;
}
m_ret = XEN_SWIOTLB_EFIXUP;
goto error;
}
start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
return;
if (early) {
swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
rc = 0;
} else
rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs);
return rc;
error:
if (repeat--) {
xen_io_tlb_nslabs = max(1024UL, /* Min is 2MB */
@ -198,10 +244,13 @@ void __init xen_swiotlb_init(int verbose)
(xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20);
goto retry;
}
xen_raw_printk("%s (rc:%d)", m, rc);
panic("%s (rc:%d)", m, rc);
pr_err("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
if (early)
panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
else
free_pages((unsigned long)xen_io_tlb_start, order);
return rc;
}
void *
xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,

1
include/linux/swiotlb.h
View File

@ -25,6 +25,7 @@ extern int swiotlb_force;
extern void swiotlb_init(int verbose);
extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern unsigned long swiotlb_nr_tbl(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
/*
* Enumeration for sync targets

2
include/xen/swiotlb-xen.h
View File

@ -3,7 +3,7 @@
#include <linux/swiotlb.h>
extern void xen_swiotlb_init(int verbose);
extern int xen_swiotlb_init(int verbose, bool early);
extern void
*xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,

33
lib/swiotlb.c
View File

@ -170,7 +170,7 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
void __init
static void __init
swiotlb_init_with_default_size(size_t default_size, int verbose)
{
unsigned long bytes;
@ -206,8 +206,9 @@ swiotlb_init(int verbose)
int
swiotlb_late_init_with_default_size(size_t default_size)
{
unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
unsigned long bytes, req_nslabs = io_tlb_nslabs;
unsigned int order;
int rc = 0;
if (!io_tlb_nslabs) {
io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
@ -229,16 +230,32 @@ swiotlb_late_init_with_default_size(size_t default_size)
order--;
}
if (!io_tlb_start)
goto cleanup1;
if (!io_tlb_start) {
io_tlb_nslabs = req_nslabs;
return -ENOMEM;
}
if (order != get_order(bytes)) {
printk(KERN_WARNING "Warning: only able to allocate %ld MB "
"for software IO TLB\n", (PAGE_SIZE << order) >> 20);
io_tlb_nslabs = SLABS_PER_PAGE << order;
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
}
rc = swiotlb_late_init_with_tbl(io_tlb_start, io_tlb_nslabs);
if (rc)
free_pages((unsigned long)io_tlb_start, order);
return rc;
}
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
unsigned long i, bytes;
bytes = nslabs << IO_TLB_SHIFT;
io_tlb_nslabs = nslabs;
io_tlb_start = tlb;
io_tlb_end = io_tlb_start + bytes;
memset(io_tlb_start, 0, bytes);
/*
@ -288,10 +305,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
io_tlb_list = NULL;
cleanup2:
io_tlb_end = NULL;
free_pages((unsigned long)io_tlb_start, order);
io_tlb_start = NULL;
cleanup1:
io_tlb_nslabs = req_nslabs;
io_tlb_nslabs = 0;
return -ENOMEM;
}