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drivers/mm: Only remap unused RAM on Kconfig on Intel ADSP MTL

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Remapping by default can confuse things that dynamically manage RAM,
such as newlib heap - since unused memory will be powered off by
default. So this patch shields this behaviour behind a non-default
Kconfig.

Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>
This commit is contained in:
Ederson de Souza 2022-10-27 23:06:41 -07:00 • committed by Anas Nashif
commit 9c55195235
2 changed files with 21 additions and 0 deletions
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10
drivers/mm/Kconfig
View file

@ -17,6 +17,16 @@ config MM_DRV_PAGE_SIZE
help
Size of memory pages.
config MM_DRV_INTEL_ADSP_TLB_REMAP_UNUSED_RAM
bool "Power off unused RAM"
help
Allows TLB driver to remap unused RAM - unused
being defined as memory ranging from linker script
defined "unused_l2_sram_start_marke" to end of RAM.
Note that unused memory will be powered off by
default. Disable this option if dynamically
managing memory, such as by usinga heap allocator.
config MM_DRV_INTEL_ADSP_MTL_TLB
bool "Intel Audio DSP TLB Driver for Meteor Lake"
default y

11
drivers/mm/mm_drv_intel_adsp_mtl_tlb.c
View file

@ -84,6 +84,7 @@ SYS_MEM_BLOCKS_DEFINE_WITH_EXT_BUF(
L2_SRAM_PAGES_NUM,
(uint8_t *) L2_SRAM_BASE);
#ifdef CONFIG_MM_DRV_INTEL_ADSP_TLB_REMAP_UNUSED_RAM
/* Define a marker which is placed by the linker script just after
* last explicitly defined section. All .text, .data, .bss and .heap
* sections should be placed before this marker in the memory.
@ -94,6 +95,14 @@ __attribute__((__section__(".unused_ram_start_marker")))
static int unused_l2_sram_start_marker = 0xba0babce;
#define UNUSED_L2_START_ALIGNED ROUND_UP(POINTER_TO_UINT(&unused_l2_sram_start_marker), \
CONFIG_MM_DRV_PAGE_SIZE)
#else
/* If memory is not going to be remaped (and thus powered off by)
* the driver, just define the unused memory start as the end of
* the memory.
*/
#define UNUSED_L2_START_ALIGNED ROUND_UP((L2_SRAM_BASE + L2_SRAM_SIZE), \
CONFIG_MM_DRV_PAGE_SIZE)
#endif
/**
* Calculate TLB entry based on physical address.
@ -682,6 +691,7 @@ static int sys_mm_drv_mm_init(const struct device *dev)
hpsram_ref[i] = SRAM_BANK_SIZE / CONFIG_MM_DRV_PAGE_SIZE;
}
#ifdef CONFIG_MM_DRV_INTEL_ADSP_TLB_REMAP_UNUSED_RAM
/*
* find virtual address range which are unused
* in the system
@ -703,6 +713,7 @@ static int sys_mm_drv_mm_init(const struct device *dev)
ret = sys_mm_drv_unmap_region(UINT_TO_POINTER(UNUSED_L2_START_ALIGNED),
unused_size);
#endif
return 0;
}