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dma-mapping: introduce DMA range map, supplanting dma_pfn_offset

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The new field 'dma_range_map' in struct device is used to facilitate the
use of single or multiple offsets between mapping regions of cpu addrs and
dma addrs.  It subsumes the role of "dev->dma_pfn_offset" which was only
capable of holding a single uniform offset and had no region bounds
checking.

The function of_dma_get_range() has been modified so that it takes a single
argument -- the device node -- and returns a map, NULL, or an error code.
The map is an array that holds the information regarding the DMA regions.
Each range entry contains the address offset, the cpu_start address, the
dma_start address, and the size of the region.

of_dma_configure() is the typical manner to set range offsets but there are
a number of ad hoc assignments to "dev->dma_pfn_offset" in the kernel
driver code.  These cases now invoke the function
dma_direct_set_offset(dev, cpu_addr, dma_addr, size).

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
[hch: various interface cleanups]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
This commit is contained in:
Jim Quinlan 2020-09-17 18:43:40 +02:00 committed by Christoph Hellwig
parent 6eb0233ec2
commit e0d072782c
22 changed files with 285 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/include/asm/dma-direct.h
View File

@ -12,8 +12,8 @@
#ifndef __arch_pfn_to_dma
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
{
if (dev)
pfn -= dev->dma_pfn_offset;
if (dev && dev->dma_range_map)
pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn)));
return (dma_addr_t)__pfn_to_bus(pfn);
}
@ -21,9 +21,8 @@ static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
{
unsigned long pfn = __bus_to_pfn(addr);
if (dev)
pfn += dev->dma_pfn_offset;
if (dev && dev->dma_range_map)
pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn)));
return pfn;
}

17
arch/arm/mach-keystone/keystone.c
View File

@ -8,6 +8,7 @@
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
@ -25,8 +26,6 @@
#include "keystone.h"
#ifdef CONFIG_ARM_LPAE
static unsigned long keystone_dma_pfn_offset __read_mostly;
static int keystone_platform_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
@ -39,9 +38,12 @@ static int keystone_platform_notifier(struct notifier_block *nb,
return NOTIFY_BAD;
if (!dev->of_node) {
dev->dma_pfn_offset = keystone_dma_pfn_offset;
dev_err(dev, "set dma_pfn_offset%08lx\n",
dev->dma_pfn_offset);
int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START,
KEYSTONE_LOW_PHYS_START,
KEYSTONE_HIGH_PHYS_SIZE);
dev_err(dev, "set dma_offset%08llx%s\n",
KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START,
ret ? " failed" : "");
}
return NOTIFY_OK;
}
@ -54,11 +56,8 @@ static struct notifier_block platform_nb = {
static void __init keystone_init(void)
{
#ifdef CONFIG_ARM_LPAE
if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
KEYSTONE_LOW_PHYS_START);
if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START)
bus_register_notifier(&platform_bus_type, &platform_nb);
}
#endif
keystone_pm_runtime_init();
}

4
arch/arm/mach-omap1/include/mach/memory.h
View File

@ -41,6 +41,10 @@
__phys_to_pfn(__dma); \
})
#define __arch_dma_to_virt(dev, addr) ({ (void *) (is_lbus_device(dev) ? \
lbus_to_virt(addr) : \
__phys_to_virt(addr)); })
#define __arch_virt_to_dma(dev, addr) ({ unsigned long __addr = (unsigned long)(addr); \
(dma_addr_t) (is_lbus_device(dev) ? \
virt_to_lbus(__addr) : \

9
arch/sh/drivers/pci/pcie-sh7786.c
View File

@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/async.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/sh_clk.h>
@ -31,6 +32,8 @@ struct sh7786_pcie_port {
static struct sh7786_pcie_port *sh7786_pcie_ports;
static unsigned int nr_ports;
static unsigned long dma_pfn_offset;
size_t memsize;
u64 memstart;
static struct sh7786_pcie_hwops {
int (*core_init)(void);
@ -301,7 +304,6 @@ static int __init pcie_init(struct sh7786_pcie_port *port)
struct pci_channel *chan = port->hose;
unsigned int data;
phys_addr_t memstart, memend;
size_t memsize;
int ret, i, win;
/* Begin initialization */
@ -368,8 +370,6 @@ static int __init pcie_init(struct sh7786_pcie_port *port)
memstart = ALIGN_DOWN(memstart, memsize);
memsize = roundup_pow_of_two(memend - memstart);
dma_pfn_offset = memstart >> PAGE_SHIFT;
/*
* If there's more than 512MB of memory, we need to roll over to
* LAR1/LAMR1.
@ -487,7 +487,8 @@ int pcibios_map_platform_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
void pcibios_bus_add_device(struct pci_dev *pdev)
{
pdev->dev.dma_pfn_offset = dma_pfn_offset;
dma_direct_set_offset(&pdev->dev, __pa(memory_start),
__pa(memory_start) - memstart, memsize);
}
static int __init sh7786_pcie_core_init(void)

6
arch/x86/pci/sta2x11-fixup.c
View File

@ -133,7 +133,7 @@ static void sta2x11_map_ep(struct pci_dev *pdev)
struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
struct device *dev = &pdev->dev;
u32 amba_base, max_amba_addr;
int i;
int i, ret;
if (!instance)
return;
@ -141,7 +141,9 @@ static void sta2x11_map_ep(struct pci_dev *pdev)
pci_read_config_dword(pdev, AHB_BASE(0), &amba_base);
max_amba_addr = amba_base + STA2X11_AMBA_SIZE - 1;
dev->dma_pfn_offset = PFN_DOWN(-amba_base);
ret = dma_direct_set_offset(dev, 0, amba_base, STA2X11_AMBA_SIZE);
if (ret)
dev_err(dev, "sta2x11: could not set DMA offset\n");
dev->bus_dma_limit = max_amba_addr;
pci_set_consistent_dma_mask(pdev, max_amba_addr);

6
drivers/acpi/arm64/iort.c
View File

@ -18,6 +18,7 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#define IORT_TYPE_MASK(type) (1 << (type))
#define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP)
@ -1184,8 +1185,9 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
*dma_addr = dmaaddr;
*dma_size = size;
dev->dma_pfn_offset = PFN_DOWN(offset);
dev_dbg(dev, "dma_pfn_offset(%#08llx)\n", offset);
ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size);
dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : "");
}
static void __init acpi_iort_register_irq(int hwirq, const char *name,

2
drivers/base/core.c
View File

@ -1792,6 +1792,8 @@ static void device_release(struct kobject *kobj)
*/
devres_release_all(dev);
kfree(dev->dma_range_map);
if (dev->release)
dev->release(dev);
else if (dev->type && dev->type->release)

8
drivers/gpu/drm/sun4i/sun4i_backend.c
View File

@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
@ -811,8 +812,13 @@ static int sun4i_backend_bind(struct device *dev, struct device *master,
* because of an old DT, we need to set the DMA offset by hand
* on our device since the RAM mapping is at 0 for the DMA bus,
* unlike the CPU.
*
* XXX(hch): this has no business in a driver and needs to move
* to the device tree.
*/
drm->dev->dma_pfn_offset = PHYS_PFN_OFFSET;
ret = dma_direct_set_offset(drm->dev, PHYS_OFFSET, 0, SZ_4G);
if (ret)
return ret;
}
backend->engine.node = dev->of_node;

2
drivers/iommu/io-pgtable-arm.c
View File

@ -751,7 +751,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
return NULL;
if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) {
if (!selftest_running && cfg->iommu_dev->dma_range_map) {
dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n");
return NULL;
}

9
drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
@ -182,8 +183,14 @@ static int sun4i_csi_probe(struct platform_device *pdev)
if (ret)
return ret;
} else {
/*
* XXX(hch): this has no business in a driver and needs to move
* to the device tree.
*/
#ifdef PHYS_PFN_OFFSET
csi->dev->dma_pfn_offset = PHYS_PFN_OFFSET;
ret = dma_direct_set_offset(csi->dev, PHYS_OFFSET, 0, SZ_4G);
if (ret)
return ret;
#endif
}

11
drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
View File

@ -899,8 +899,15 @@ static int sun6i_csi_probe(struct platform_device *pdev)
return -ENOMEM;
sdev->dev = &pdev->dev;
/* The DMA bus has the memory mapped at 0 */
sdev->dev->dma_pfn_offset = PHYS_OFFSET >> PAGE_SHIFT;
/*
* The DMA bus has the memory mapped at 0.
*
* XXX(hch): this has no business in a driver and needs to move
* to the device tree.
*/
ret = dma_direct_set_offset(sdev->dev, PHYS_OFFSET, 0, SZ_4G);
if (ret)
return ret;
ret = sun6i_csi_resource_request(sdev, pdev);
if (ret)

73
drivers/of/address.c
View File

@ -13,6 +13,7 @@
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/dma-direct.h> /* for bus_dma_region */
#include "of_private.h"
@ -937,33 +938,33 @@ void __iomem *of_io_request_and_map(struct device_node *np, int index,
}
EXPORT_SYMBOL(of_io_request_and_map);
#ifdef CONFIG_HAS_DMA
/**
* of_dma_get_range - Get DMA range info
* of_dma_get_range - Get DMA range info and put it into a map array
* @np: device node to get DMA range info
* @dma_addr: pointer to store initial DMA address of DMA range
* @paddr: pointer to store initial CPU address of DMA range
* @size: pointer to store size of DMA range
* @map: dma range structure to return
*
* Look in bottom up direction for the first "dma-ranges" property
* and parse it.
* dma-ranges format:
* and parse it. Put the information into a DMA offset map array.
*
* dma-ranges format:
* DMA addr (dma_addr) : naddr cells
* CPU addr (phys_addr_t) : pna cells
* size : nsize cells
*
* It returns -ENODEV if "dma-ranges" property was not found
* for this device in DT.
* It returns -ENODEV if "dma-ranges" property was not found for this
* device in the DT.
*/
int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size)
int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
{
struct device_node *node = of_node_get(np);
const __be32 *ranges = NULL;
int len;
int ret = 0;
bool found_dma_ranges = false;
struct of_range_parser parser;
struct of_range range;
u64 dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
struct bus_dma_region *r;
int len, num_ranges = 0;
int ret = 0;
while (node) {
ranges = of_get_property(node, "dma-ranges", &len);
@ -989,49 +990,39 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz
}
of_dma_range_parser_init(&parser, node);
for_each_of_range(&parser, &range)
num_ranges++;
r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL);
if (!r) {
ret = -ENOMEM;
goto out;
}
/*
* Record all info in the generic DMA ranges array for struct device.
*/
*map = r;
of_dma_range_parser_init(&parser, node);
for_each_of_range(&parser, &range) {
pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
range.bus_addr, range.cpu_addr, range.size);
if (dma_offset && range.cpu_addr - range.bus_addr != dma_offset) {
pr_warn("Can't handle multiple dma-ranges with different offsets on node(%pOF)\n", node);
/* Don't error out as we'd break some existing DTs */
continue;
}
if (range.cpu_addr == OF_BAD_ADDR) {
pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n",
range.bus_addr, node);
continue;
}
dma_offset = range.cpu_addr - range.bus_addr;
/* Take lower and upper limits */
if (range.bus_addr < dma_start)
dma_start = range.bus_addr;
if (range.bus_addr + range.size > dma_end)
dma_end = range.bus_addr + range.size;
r->cpu_start = range.cpu_addr;
r->dma_start = range.bus_addr;
r->size = range.size;
r->offset = range.cpu_addr - range.bus_addr;
r++;
}
if (dma_start >= dma_end) {
ret = -EINVAL;
pr_debug("Invalid DMA ranges configuration on node(%pOF)\n",
node);
goto out;
}
*dma_addr = dma_start;
*size = dma_end - dma_start;
*paddr = dma_start + dma_offset;
pr_debug("final: dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
*dma_addr, *paddr, *size);
out:
of_node_put(node);
return ret;
}
#endif /* CONFIG_HAS_DMA */
/**
* of_dma_is_coherent - Check if device is coherent

44
drivers/of/device.c
View File

@ -5,7 +5,7 @@
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h> /* for bus_dma_region */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
@ -90,14 +90,14 @@ int of_device_add(struct platform_device *ofdev)
int of_dma_configure_id(struct device *dev, struct device_node *np,
bool force_dma, const u32 *id)
{
u64 dma_addr, paddr, size = 0;
int ret;
bool coherent;
unsigned long offset;
const struct iommu_ops *iommu;
u64 mask, end;
const struct bus_dma_region *map = NULL;
dma_addr_t dma_start = 0;
u64 mask, end, size = 0;
bool coherent;
int ret;
ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
ret = of_dma_get_range(np, &map);
if (ret < 0) {
/*
* For legacy reasons, we have to assume some devices need
@ -106,26 +106,35 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
*/
if (!force_dma)
return ret == -ENODEV ? 0 : ret;
dma_addr = offset = 0;
} else {
offset = PFN_DOWN(paddr - dma_addr);
const struct bus_dma_region *r = map;
dma_addr_t dma_end = 0;
/* Determine the overall bounds of all DMA regions */
for (dma_start = ~(dma_addr_t)0; r->size; r++) {
/* Take lower and upper limits */
if (r->dma_start < dma_start)
dma_start = r->dma_start;
if (r->dma_start + r->size > dma_end)
dma_end = r->dma_start + r->size;
}
size = dma_end - dma_start;
/*
* Add a work around to treat the size as mask + 1 in case
* it is defined in DT as a mask.
*/
if (size & 1) {
dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",
size);
size = size + 1;
}
if (!size) {
dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
kfree(map);
return -EINVAL;
}
dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
}
/*
@ -144,13 +153,11 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
else if (!size)
size = 1ULL << 32;
dev->dma_pfn_offset = offset;
/*
* Limit coherent and dma mask based on size and default mask
* set by the driver.
*/
end = dma_addr + size - 1;
end = dma_start + size - 1;
mask = DMA_BIT_MASK(ilog2(end) + 1);
dev->coherent_dma_mask &= mask;
*dev->dma_mask &= mask;
@ -163,14 +170,17 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
coherent ? " " : " not ");
iommu = of_iommu_configure(dev, np, id);
if (PTR_ERR(iommu) == -EPROBE_DEFER)
if (PTR_ERR(iommu) == -EPROBE_DEFER) {
kfree(map);
return -EPROBE_DEFER;
}
dev_dbg(dev, "device is%sbehind an iommu\n",
iommu ? " " : " not ");
arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
dev->dma_range_map = map;
return 0;
}
EXPORT_SYMBOL_GPL(of_dma_configure_id);

11
drivers/of/of_private.h
View File

@ -157,12 +157,13 @@ extern void __of_sysfs_remove_bin_file(struct device_node *np,
extern int of_bus_n_addr_cells(struct device_node *np);
extern int of_bus_n_size_cells(struct device_node *np);
#ifdef CONFIG_OF_ADDRESS
extern int of_dma_get_range(struct device_node *np, u64 *dma_addr,
u64 *paddr, u64 *size);
struct bus_dma_region;
#if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA)
int of_dma_get_range(struct device_node *np,
const struct bus_dma_region **map);
#else
static inline int of_dma_get_range(struct device_node *np, u64 *dma_addr,
u64 *paddr, u64 *size)
static inline int of_dma_get_range(struct device_node *np,
const struct bus_dma_region **map)
{
return -ENODEV;
}

34
drivers/of/unittest.c
View File

@ -7,6 +7,7 @@
#include <linux/memblock.h>
#include <linux/clk.h>
#include <linux/dma-direct.h> /* to test phys_to_dma/dma_to_phys */
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/hashtable.h>
@ -869,10 +870,11 @@ static void __init of_unittest_changeset(void)
}
static void __init of_unittest_dma_ranges_one(const char *path,
u64 expect_dma_addr, u64 expect_paddr, u64 expect_size)
u64 expect_dma_addr, u64 expect_paddr)
{
#ifdef CONFIG_HAS_DMA
struct device_node *np;
u64 dma_addr, paddr, size;
const struct bus_dma_region *map = NULL;
int rc;
np = of_find_node_by_path(path);
@ -881,28 +883,40 @@ static void __init of_unittest_dma_ranges_one(const char *path,
return;
}
rc = of_dma_get_range(np, &dma_addr, &paddr, &size);
rc = of_dma_get_range(np, &map);
unittest(!rc, "of_dma_get_range failed on node %pOF rc=%i\n", np, rc);
if (!rc) {
unittest(size == expect_size,
"of_dma_get_range wrong size on node %pOF size=%llx\n", np, size);
phys_addr_t paddr;
dma_addr_t dma_addr;
struct device dev_bogus;
dev_bogus.dma_range_map = map;
paddr = dma_to_phys(&dev_bogus, expect_dma_addr);
dma_addr = phys_to_dma(&dev_bogus, expect_paddr);
unittest(paddr == expect_paddr,
"of_dma_get_range wrong phys addr (%llx) on node %pOF", paddr, np);
"of_dma_get_range: wrong phys addr %pap (expecting %llx) on node %pOF\n",
&paddr, expect_paddr, np);
unittest(dma_addr == expect_dma_addr,
"of_dma_get_range wrong DMA addr (%llx) on node %pOF", dma_addr, np);
"of_dma_get_range: wrong DMA addr %pad (expecting %llx) on node %pOF\n",
&dma_addr, expect_dma_addr, np);
kfree(map);
}
of_node_put(np);
#endif
}
static void __init of_unittest_parse_dma_ranges(void)
{
of_unittest_dma_ranges_one("/testcase-data/address-tests/device@70000000",
0x0, 0x20000000, 0x40000000);
0x0, 0x20000000);
of_unittest_dma_ranges_one("/testcase-data/address-tests/bus@80000000/device@1000",
0x100000000, 0x20000000, 0x2000000000);
0x100000000, 0x20000000);
of_unittest_dma_ranges_one("/testcase-data/address-tests/pci@90000000",
0x80000000, 0x20000000, 0x10000000);
0x80000000, 0x20000000);
}
static void __init of_unittest_pci_dma_ranges(void)

24
drivers/remoteproc/remoteproc_core.c
View File

@ -23,6 +23,7 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h> /* XXX: pokes into bus_dma_range */
#include <linux/firmware.h>
#include <linux/string.h>
#include <linux/debugfs.h>
@ -458,6 +459,25 @@ static void rproc_rvdev_release(struct device *dev)
kfree(rvdev);
}
static int copy_dma_range_map(struct device *to, struct device *from)
{
const struct bus_dma_region *map = from->dma_range_map, *new_map, *r;
int num_ranges = 0;
if (!map)
return 0;
for (r = map; r->size; r++)
num_ranges++;
new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)),
GFP_KERNEL);
if (!new_map)
return -ENOMEM;
to->dma_range_map = new_map;
return 0;
}
/**
* rproc_handle_vdev() - handle a vdev fw resource
* @rproc: the remote processor
@ -529,7 +549,9 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
/* Initialise vdev subdevice */
snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
rvdev->dev.parent = &rproc->dev;
rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent);
if (ret)
return ret;
rvdev->dev.release = rproc_rvdev_release;
dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
dev_set_drvdata(&rvdev->dev, rvdev);

10
drivers/staging/media/sunxi/cedrus/cedrus_hw.c
View File

@ -227,11 +227,17 @@ int cedrus_hw_probe(struct cedrus_dev *dev)
* the RAM offset to the physcal addresses.
*
* This information will eventually be obtained from device-tree.
*
* XXX(hch): this has no business in a driver and needs to move
* to the device tree.
*/
#ifdef PHYS_PFN_OFFSET
if (!(variant->quirks & CEDRUS_QUIRK_NO_DMA_OFFSET))
dev->dev->dma_pfn_offset = PHYS_PFN_OFFSET;
if (!(variant->quirks & CEDRUS_QUIRK_NO_DMA_OFFSET)) {
ret = dma_direct_set_offset(dev->dev, PHYS_OFFSET, 0, SZ_4G);
if (ret)
return ret;
}
#endif
ret = of_reserved_mem_device_init(dev->dev);

4
include/linux/device.h
View File

@ -466,7 +466,7 @@ struct dev_links_info {
* such descriptors.
* @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
* DMA limit than the device itself supports.
* @dma_pfn_offset: offset of DMA memory range relatively of RAM
* @dma_range_map: map for DMA memory ranges relative to that of RAM
* @dma_parms: A low level driver may set these to teach IOMMU code about
* segment limitations.
* @dma_pools: Dma pools (if dma'ble device).
@ -561,7 +561,7 @@ struct device {
64 bit addresses for consistent
allocations such descriptors. */
u64 bus_dma_limit; /* upstream dma constraint */
unsigned long dma_pfn_offset;
const struct bus_dma_region *dma_range_map;
struct device_dma_parameters *dma_parms;

53
include/linux/dma-direct.h
View File

@ -14,6 +14,41 @@
extern unsigned int zone_dma_bits;
/*
* Record the mapping of CPU physical to DMA addresses for a given region.
*/
struct bus_dma_region {
phys_addr_t cpu_start;
dma_addr_t dma_start;
u64 size;
u64 offset;
};
static inline dma_addr_t translate_phys_to_dma(struct device *dev,
phys_addr_t paddr)
{
const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++)
if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size)
return (dma_addr_t)paddr - m->offset;
/* make sure dma_capable fails when no translation is available */
return DMA_MAPPING_ERROR;
}
static inline phys_addr_t translate_dma_to_phys(struct device *dev,
dma_addr_t dma_addr)
{
const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++)
if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size)
return (phys_addr_t)dma_addr + m->offset;
return (phys_addr_t)-1;
}
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#ifndef phys_to_dma_unencrypted
@ -23,9 +58,9 @@ extern unsigned int zone_dma_bits;
static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
phys_addr_t paddr)
{
dma_addr_t dev_addr = (dma_addr_t)paddr;
return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
if (dev->dma_range_map)
return translate_phys_to_dma(dev, paddr);
return paddr;
}
/*
@ -39,10 +74,14 @@ static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
return __sme_set(phys_to_dma_unencrypted(dev, paddr));
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
phys_addr_t paddr = (phys_addr_t)dev_addr +
((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
phys_addr_t paddr;
if (dev->dma_range_map)
paddr = translate_dma_to_phys(dev, dma_addr);
else
paddr = dma_addr;
return __sme_clr(paddr);
}
@ -62,6 +101,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
{
dma_addr_t end = addr + size - 1;
if (addr == DMA_MAPPING_ERROR)
return false;
if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
return false;

9
include/linux/dma-mapping.h
View File

@ -730,4 +730,11 @@ static inline int dma_mmap_wc(struct device *dev,
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
#endif
#endif
/*
* Legacy interface to set up the dma offset map. Drivers really should not
* actually use it, but we have a few legacy cases left.
*/
int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
dma_addr_t dma_start, u64 size);
#endif /* _LINUX_DMA_MAPPING_H */

7
kernel/dma/coherent.c
View File

@ -7,7 +7,7 @@
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
struct dma_coherent_mem {
void *virt_base;
@ -32,9 +32,8 @@ static inline dma_addr_t dma_get_device_base(struct device *dev,
struct dma_coherent_mem * mem)
{
if (mem->use_dev_dma_pfn_offset)
return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT;
else
return mem->device_base;
return phys_to_dma(dev, PFN_PHYS(mem->pfn_base));
return mem->device_base;
}
static int dma_init_coherent_memory(phys_addr_t phys_addr,

51
kernel/dma/direct.c
View File

@ -13,6 +13,7 @@
#include <linux/pfn.h>
#include <linux/vmalloc.h>
#include <linux/set_memory.h>
#include <linux/slab.h>
/*
* Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it
@ -66,8 +67,12 @@ static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
{
return phys_to_dma_direct(dev, phys) + size - 1 <=
min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
dma_addr_t dma_addr = phys_to_dma_direct(dev, phys);
if (dma_addr == DMA_MAPPING_ERROR)
return false;
return dma_addr + size - 1 <=
min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
}
/*
@ -461,3 +466,45 @@ bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr)
return !dev_is_dma_coherent(dev) ||
is_swiotlb_buffer(dma_to_phys(dev, dma_addr));
}
/**
* dma_direct_set_offset - Assign scalar offset for a single DMA range.
* @dev: device pointer; needed to "own" the alloced memory.
* @cpu_start: beginning of memory region covered by this offset.
* @dma_start: beginning of DMA/PCI region covered by this offset.
* @size: size of the region.
*
* This is for the simple case of a uniform offset which cannot
* be discovered by "dma-ranges".
*
* It returns -ENOMEM if out of memory, -EINVAL if a map
* already exists, 0 otherwise.
*
* Note: any call to this from a driver is a bug. The mapping needs
* to be described by the device tree or other firmware interfaces.
*/
int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
dma_addr_t dma_start, u64 size)
{
struct bus_dma_region *map;
u64 offset = (u64)cpu_start - (u64)dma_start;
if (dev->dma_range_map) {
dev_err(dev, "attempt to add DMA range to existing map\n");
return -EINVAL;
}
if (!offset)
return 0;
map = kcalloc(2, sizeof(*map), GFP_KERNEL);
if (!map)
return -ENOMEM;
map[0].cpu_start = cpu_start;
map[0].dma_start = dma_start;
map[0].offset = offset;
map[0].size = size;
dev->dma_range_map = map;
return 0;
}
EXPORT_SYMBOL_GPL(dma_direct_set_offset);