Device tree fixes and reverts for v3.12-rc5
One bug fix and three reverts. The reverts back out the slightly controversial feeding the entire device tree into the random pool and the reserved-memory binding which isn't fully baked yet. Expect the reserved-memory patches at least to resurface for v3.13. The bug fixes removes a scary but harmless warning on SPARC that was introduced in the v3.12 merge window. v3.13 will contain a proper fix that makes the new code work on SPARC. On the plus side, the diffstat looks *awesome*. I love removing lines of code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSXbO9AAoJEJZcAETA+ZUxuH4IAI/KF71fq0/O7en7GHo6ofcZ 3nA3fUyYpnjehaqmKDXxix4TUgKTYU1ZP6tn8VfM6fn0QthR2YXPYAqiIaRot3ab arCPvJ9N52CU04Ug8dqMPEuFlSqRfTYc0EVPTbdgv8GYWX+rjP4qmOWS13exorai hJSRFmbyvwOVvRAl7KtkBPEZ3ri40mfkTrMs61v55GajhaZFyoTQgMMNhboUskI7 qztWiecw1stlvbfQEoN+BA11ohp5kDf4d5jeTCMNFx81liBbZHYfwWbmwYPCH7/z 6s4gX6PQeCuygdhQK65q1tYebTmRbFxkuf8P/tO7lEpmR3fKIVBr+oMJff0q9ww= =8W6e -----END PGP SIGNATURE----- Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux Pull device tree fixes and reverts from Grant Likely: "One bug fix and three reverts. The reverts back out the slightly controversial feeding the entire device tree into the random pool and the reserved-memory binding which isn't fully baked yet. Expect the reserved-memory patches at least to resurface for v3.13. The bug fixes removes a scary but harmless warning on SPARC that was introduced in the v3.12 merge window. v3.13 will contain a proper fix that makes the new code work on SPARC. On the plus side, the diffstat looks *awesome*. I love removing lines of code" * tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux: Revert "drivers: of: add initialization code for dma reserved memory" Revert "ARM: init: add support for reserved memory defined by device tree" Revert "of: Feed entire flattened device tree into the random pool" of: fix unnecessary warning on missing /cpus node
This commit is contained in:
Linus Torvalds
Коммит
34ec4de42b
|
|
@ -1,168 +0,0 @@
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|||
*** Memory binding ***
|
||||
|
||||
The /memory node provides basic information about the address and size
|
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of the physical memory. This node is usually filled or updated by the
|
||||
bootloader, depending on the actual memory configuration of the given
|
||||
hardware.
|
||||
|
||||
The memory layout is described by the following node:
|
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|
||||
/ {
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#address-cells = <(n)>;
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#size-cells = <(m)>;
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memory {
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||||
device_type = "memory";
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||||
reg = <(baseaddr1) (size1)
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(baseaddr2) (size2)
|
||||
...
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||||
(baseaddrN) (sizeN)>;
|
||||
};
|
||||
...
|
||||
};
|
||||
|
||||
A memory node follows the typical device tree rules for "reg" property:
|
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n: number of cells used to store base address value
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m: number of cells used to store size value
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baseaddrX: defines a base address of the defined memory bank
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sizeX: the size of the defined memory bank
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|
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More than one memory bank can be defined.
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*** Reserved memory regions ***
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In /memory/reserved-memory node one can create child nodes describing
|
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particular reserved (excluded from normal use) memory regions. Such
|
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memory regions are usually designed for the special usage by various
|
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device drivers. A good example are contiguous memory allocations or
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memory sharing with other operating system on the same hardware board.
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Those special memory regions might depend on the board configuration and
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devices used on the target system.
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Parameters for each memory region can be encoded into the device tree
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with the following convention:
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[(label):] (name) {
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compatible = "linux,contiguous-memory-region", "reserved-memory-region";
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reg = <(address) (size)>;
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(linux,default-contiguous-region);
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};
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compatible: one or more of:
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- "linux,contiguous-memory-region" - enables binding of this
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region to Contiguous Memory Allocator (special region for
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contiguous memory allocations, shared with movable system
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memory, Linux kernel-specific).
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- "reserved-memory-region" - compatibility is defined, given
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region is assigned for exclusive usage for by the respective
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devices.
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reg: standard property defining the base address and size of
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the memory region
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linux,default-contiguous-region: property indicating that the region
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is the default region for all contiguous memory
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allocations, Linux specific (optional)
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It is optional to specify the base address, so if one wants to use
|
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autoconfiguration of the base address, '0' can be specified as a base
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address in the 'reg' property.
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The /memory/reserved-memory node must contain the same #address-cells
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and #size-cells value as the root node.
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|
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*** Device node's properties ***
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||||
|
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Once regions in the /memory/reserved-memory node have been defined, they
|
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may be referenced by other device nodes. Bindings that wish to reference
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memory regions should explicitly document their use of the following
|
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property:
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memory-region = <&phandle_to_defined_region>;
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|
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This property indicates that the device driver should use the memory
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||||
region pointed by the given phandle.
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||||
|
||||
|
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*** Example ***
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||||
|
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This example defines a memory consisting of 4 memory banks. 3 contiguous
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regions are defined for Linux kernel, one default of all device drivers
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(named contig_mem, placed at 0x72000000, 64MiB), one dedicated to the
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framebuffer device (labelled display_mem, placed at 0x78000000, 8MiB)
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and one for multimedia processing (labelled multimedia_mem, placed at
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0x77000000, 64MiB). 'display_mem' region is then assigned to fb@12300000
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device for DMA memory allocations (Linux kernel drivers will use CMA is
|
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available or dma-exclusive usage otherwise). 'multimedia_mem' is
|
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assigned to scaler@12500000 and codec@12600000 devices for contiguous
|
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memory allocations when CMA driver is enabled.
|
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|
||||
The reason for creating a separate region for framebuffer device is to
|
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match the framebuffer base address to the one configured by bootloader,
|
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so once Linux kernel drivers starts no glitches on the displayed boot
|
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logo appears. Scaller and codec drivers should share the memory
|
||||
allocations.
|
||||
|
||||
/ {
|
||||
#address-cells = <1>;
|
||||
#size-cells = <1>;
|
||||
|
||||
/* ... */
|
||||
|
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memory {
|
||||
reg = <0x40000000 0x10000000
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||||
0x50000000 0x10000000
|
||||
0x60000000 0x10000000
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0x70000000 0x10000000>;
|
||||
|
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reserved-memory {
|
||||
#address-cells = <1>;
|
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#size-cells = <1>;
|
||||
|
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/*
|
||||
* global autoconfigured region for contiguous allocations
|
||||
* (used only with Contiguous Memory Allocator)
|
||||
*/
|
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contig_region@0 {
|
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compatible = "linux,contiguous-memory-region";
|
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reg = <0x0 0x4000000>;
|
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linux,default-contiguous-region;
|
||||
};
|
||||
|
||||
/*
|
||||
* special region for framebuffer
|
||||
*/
|
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display_region: region@78000000 {
|
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compatible = "linux,contiguous-memory-region", "reserved-memory-region";
|
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reg = <0x78000000 0x800000>;
|
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};
|
||||
|
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/*
|
||||
* special region for multimedia processing devices
|
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*/
|
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multimedia_region: region@77000000 {
|
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compatible = "linux,contiguous-memory-region";
|
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reg = <0x77000000 0x4000000>;
|
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};
|
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};
|
||||
};
|
||||
|
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/* ... */
|
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|
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fb0: fb@12300000 {
|
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status = "okay";
|
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memory-region = <&display_region>;
|
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};
|
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|
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scaler: scaler@12500000 {
|
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status = "okay";
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memory-region = <&multimedia_region>;
|
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};
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|
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codec: codec@12600000 {
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status = "okay";
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memory-region = <&multimedia_region>;
|
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};
|
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};
|
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|
|
@ -17,7 +17,6 @@
|
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#include <linux/nodemask.h>
|
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/of_reserved_mem.h>
|
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#include <linux/highmem.h>
|
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#include <linux/gfp.h>
|
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#include <linux/memblock.h>
|
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|
|
@ -379,8 +378,6 @@ void __init arm_memblock_init(struct meminfo *mi,
|
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if (mdesc->reserve)
|
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mdesc->reserve();
|
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|
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early_init_dt_scan_reserved_mem();
|
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|
||||
/*
|
||||
* reserve memory for DMA contigouos allocations,
|
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* must come from DMA area inside low memory
|
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|
|
|
|||
|
|
@ -74,10 +74,4 @@ config OF_MTD
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depends on MTD
|
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def_bool y
|
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|
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config OF_RESERVED_MEM
|
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depends on OF_FLATTREE && (DMA_CMA || (HAVE_GENERIC_DMA_COHERENT && HAVE_MEMBLOCK))
|
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def_bool y
|
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help
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Initialization code for DMA reserved memory
|
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|
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endmenu # OF
|
||||
|
|
|
|||
|
|
@ -9,4 +9,3 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o
|
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obj-$(CONFIG_OF_PCI) += of_pci.o
|
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obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
|
||||
obj-$(CONFIG_OF_MTD) += of_mtd.o
|
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obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
|
||||
|
|
|
|||
|
|
@ -303,10 +303,8 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
|
|||
struct device_node *cpun, *cpus;
|
||||
|
||||
cpus = of_find_node_by_path("/cpus");
|
||||
if (!cpus) {
|
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pr_warn("Missing cpus node, bailing out\n");
|
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if (!cpus)
|
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return NULL;
|
||||
}
|
||||
|
||||
for_each_child_of_node(cpus, cpun) {
|
||||
if (of_node_cmp(cpun->type, "cpu"))
|
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|
|
|
|||
|
|
@ -18,7 +18,6 @@
|
|||
#include <linux/string.h>
|
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#include <linux/errno.h>
|
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#include <linux/slab.h>
|
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#include <linux/random.h>
|
||||
|
||||
#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
|
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#ifdef CONFIG_PPC
|
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|
|
@ -803,14 +802,3 @@ void __init unflatten_device_tree(void)
|
|||
}
|
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|
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#endif /* CONFIG_OF_EARLY_FLATTREE */
|
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|
||||
/* Feed entire flattened device tree into the random pool */
|
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static int __init add_fdt_randomness(void)
|
||||
{
|
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if (initial_boot_params)
|
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add_device_randomness(initial_boot_params,
|
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be32_to_cpu(initial_boot_params->totalsize));
|
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|
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return 0;
|
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}
|
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core_initcall(add_fdt_randomness);
|
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|
|
|
|||
|
|
@ -1,173 +0,0 @@
|
|||
/*
|
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* Device tree based initialization code for reserved memory.
|
||||
*
|
||||
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
|
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* http://www.samsung.com
|
||||
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of the
|
||||
* License or (at your optional) any later version of the license.
|
||||
*/
|
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|
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#include <linux/memblock.h>
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#include <linux/err.h>
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#include <linux/of.h>
|
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#include <linux/of_fdt.h>
|
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#include <linux/of_platform.h>
|
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#include <linux/mm.h>
|
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#include <linux/sizes.h>
|
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#include <linux/mm_types.h>
|
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#include <linux/dma-contiguous.h>
|
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#include <linux/dma-mapping.h>
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#include <linux/of_reserved_mem.h>
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|
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#define MAX_RESERVED_REGIONS 16
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struct reserved_mem {
|
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phys_addr_t base;
|
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unsigned long size;
|
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struct cma *cma;
|
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char name[32];
|
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};
|
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static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
|
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static int reserved_mem_count;
|
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|
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static int __init fdt_scan_reserved_mem(unsigned long node, const char *uname,
|
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int depth, void *data)
|
||||
{
|
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struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
|
||||
phys_addr_t base, size;
|
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int is_cma, is_reserved;
|
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unsigned long len;
|
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const char *status;
|
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__be32 *prop;
|
||||
|
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is_cma = IS_ENABLED(CONFIG_DMA_CMA) &&
|
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of_flat_dt_is_compatible(node, "linux,contiguous-memory-region");
|
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is_reserved = of_flat_dt_is_compatible(node, "reserved-memory-region");
|
||||
|
||||
if (!is_reserved && !is_cma) {
|
||||
/* ignore node and scan next one */
|
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return 0;
|
||||
}
|
||||
|
||||
status = of_get_flat_dt_prop(node, "status", &len);
|
||||
if (status && strcmp(status, "okay") != 0) {
|
||||
/* ignore disabled node nad scan next one */
|
||||
return 0;
|
||||
}
|
||||
|
||||
prop = of_get_flat_dt_prop(node, "reg", &len);
|
||||
if (!prop || (len < (dt_root_size_cells + dt_root_addr_cells) *
|
||||
sizeof(__be32))) {
|
||||
pr_err("Reserved mem: node %s, incorrect \"reg\" property\n",
|
||||
uname);
|
||||
/* ignore node and scan next one */
|
||||
return 0;
|
||||
}
|
||||
base = dt_mem_next_cell(dt_root_addr_cells, &prop);
|
||||
size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
||||
|
||||
if (!size) {
|
||||
/* ignore node and scan next one */
|
||||
return 0;
|
||||
}
|
||||
|
||||
pr_info("Reserved mem: found %s, memory base %lx, size %ld MiB\n",
|
||||
uname, (unsigned long)base, (unsigned long)size / SZ_1M);
|
||||
|
||||
if (reserved_mem_count == ARRAY_SIZE(reserved_mem))
|
||||
return -ENOSPC;
|
||||
|
||||
rmem->base = base;
|
||||
rmem->size = size;
|
||||
strlcpy(rmem->name, uname, sizeof(rmem->name));
|
||||
|
||||
if (is_cma) {
|
||||
struct cma *cma;
|
||||
if (dma_contiguous_reserve_area(size, base, 0, &cma) == 0) {
|
||||
rmem->cma = cma;
|
||||
reserved_mem_count++;
|
||||
if (of_get_flat_dt_prop(node,
|
||||
"linux,default-contiguous-region",
|
||||
NULL))
|
||||
dma_contiguous_set_default(cma);
|
||||
}
|
||||
} else if (is_reserved) {
|
||||
if (memblock_remove(base, size) == 0)
|
||||
reserved_mem_count++;
|
||||
else
|
||||
pr_err("Failed to reserve memory for %s\n", uname);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct reserved_mem *get_dma_memory_region(struct device *dev)
|
||||
{
|
||||
struct device_node *node;
|
||||
const char *name;
|
||||
int i;
|
||||
|
||||
node = of_parse_phandle(dev->of_node, "memory-region", 0);
|
||||
if (!node)
|
||||
return NULL;
|
||||
|
||||
name = kbasename(node->full_name);
|
||||
for (i = 0; i < reserved_mem_count; i++)
|
||||
if (strcmp(name, reserved_mem[i].name) == 0)
|
||||
return &reserved_mem[i];
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* of_reserved_mem_device_init() - assign reserved memory region to given device
|
||||
*
|
||||
* This function assign memory region pointed by "memory-region" device tree
|
||||
* property to the given device.
|
||||
*/
|
||||
void of_reserved_mem_device_init(struct device *dev)
|
||||
{
|
||||
struct reserved_mem *region = get_dma_memory_region(dev);
|
||||
if (!region)
|
||||
return;
|
||||
|
||||
if (region->cma) {
|
||||
dev_set_cma_area(dev, region->cma);
|
||||
pr_info("Assigned CMA %s to %s device\n", region->name,
|
||||
dev_name(dev));
|
||||
} else {
|
||||
if (dma_declare_coherent_memory(dev, region->base, region->base,
|
||||
region->size, DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) != 0)
|
||||
pr_info("Declared reserved memory %s to %s device\n",
|
||||
region->name, dev_name(dev));
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* of_reserved_mem_device_release() - release reserved memory device structures
|
||||
*
|
||||
* This function releases structures allocated for memory region handling for
|
||||
* the given device.
|
||||
*/
|
||||
void of_reserved_mem_device_release(struct device *dev)
|
||||
{
|
||||
struct reserved_mem *region = get_dma_memory_region(dev);
|
||||
if (!region && !region->cma)
|
||||
dma_release_declared_memory(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* early_init_dt_scan_reserved_mem() - create reserved memory regions
|
||||
*
|
||||
* This function grabs memory from early allocator for device exclusive use
|
||||
* defined in device tree structures. It should be called by arch specific code
|
||||
* once the early allocator (memblock) has been activated and all other
|
||||
* subsystems have already allocated/reserved memory.
|
||||
*/
|
||||
void __init early_init_dt_scan_reserved_mem(void)
|
||||
{
|
||||
of_scan_flat_dt_by_path("/memory/reserved-memory",
|
||||
fdt_scan_reserved_mem, NULL);
|
||||
}
|
||||
|
|
@ -21,7 +21,6 @@
|
|||
#include <linux/of_device.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/of_reserved_mem.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
const struct of_device_id of_default_bus_match_table[] = {
|
||||
|
|
@ -219,8 +218,6 @@ static struct platform_device *of_platform_device_create_pdata(
|
|||
dev->dev.bus = &platform_bus_type;
|
||||
dev->dev.platform_data = platform_data;
|
||||
|
||||
of_reserved_mem_device_init(&dev->dev);
|
||||
|
||||
/* We do not fill the DMA ops for platform devices by default.
|
||||
* This is currently the responsibility of the platform code
|
||||
* to do such, possibly using a device notifier
|
||||
|
|
@ -228,7 +225,6 @@ static struct platform_device *of_platform_device_create_pdata(
|
|||
|
||||
if (of_device_add(dev) != 0) {
|
||||
platform_device_put(dev);
|
||||
of_reserved_mem_device_release(&dev->dev);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,14 +0,0 @@
|
|||
#ifndef __OF_RESERVED_MEM_H
|
||||
#define __OF_RESERVED_MEM_H
|
||||
|
||||
#ifdef CONFIG_OF_RESERVED_MEM
|
||||
void of_reserved_mem_device_init(struct device *dev);
|
||||
void of_reserved_mem_device_release(struct device *dev);
|
||||
void early_init_dt_scan_reserved_mem(void);
|
||||
#else
|
||||
static inline void of_reserved_mem_device_init(struct device *dev) { }
|
||||
static inline void of_reserved_mem_device_release(struct device *dev) { }
|
||||
static inline void early_init_dt_scan_reserved_mem(void) { }
|
||||
#endif
|
||||
|
||||
#endif /* __OF_RESERVED_MEM_H */
|
||||
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