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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v2 1/7] xen/acpi: Rework acpi_os_map_memory() and acpi_os_unmap_memory()
On Fri, 23 Oct 2020, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> The functions acpi_os_{un,}map_memory() are meant to be arch-agnostic
> while the __acpi_os_{un,}map_memory() are meant to be arch-specific.
>
> Currently, the former are still containing x86 specific code.
>
> To avoid this rather strange split, the generic helpers are reworked so
> they are arch-agnostic. This requires the introduction of a new helper
> __acpi_os_unmap_memory() that will undo any mapping done by
> __acpi_os_map_memory().
>
> Currently, the arch-helper for unmap is basically a no-op so it only
> returns whether the mapping was arch specific. But this will change
> in the future.
>
> Note that the x86 version of acpi_os_map_memory() was already able to
> able the 1MB region. Hence why there is no addition of new code.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx>
> Tested-by: Rahul Singh <rahul.singh@xxxxxxx>
Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> ---
> Changes in v2:
> - Constify ptr in __acpi_unmap_table()
> - Coding style fixes
> - Fix build on arm64
> - Use PAGE_OFFSET() rather than open-coding it
> - Add Rahul's tested-by and reviewed-by
> ---
> xen/arch/arm/acpi/lib.c | 12 ++++++++++++
> xen/arch/x86/acpi/lib.c | 18 ++++++++++++++++++
> xen/drivers/acpi/osl.c | 34 ++++++++++++++++++----------------
> xen/include/xen/acpi.h | 1 +
> 4 files changed, 49 insertions(+), 16 deletions(-)
>
> diff --git a/xen/arch/arm/acpi/lib.c b/xen/arch/arm/acpi/lib.c
> index 4fc6e17322c1..fcc186b03399 100644
> --- a/xen/arch/arm/acpi/lib.c
> +++ b/xen/arch/arm/acpi/lib.c
> @@ -30,6 +30,10 @@ char *__acpi_map_table(paddr_t phys, unsigned long size)
> unsigned long base, offset, mapped_size;
> int idx;
>
> + /* No arch specific implementation after early boot */
> + if ( system_state >= SYS_STATE_boot )
> + return NULL;
> +
> offset = phys & (PAGE_SIZE - 1);
> mapped_size = PAGE_SIZE - offset;
> set_fixmap(FIXMAP_ACPI_BEGIN, maddr_to_mfn(phys), PAGE_HYPERVISOR);
> @@ -49,6 +53,14 @@ char *__acpi_map_table(paddr_t phys, unsigned long size)
> return ((char *) base + offset);
> }
>
> +bool __acpi_unmap_table(const void *ptr, unsigned long size)
> +{
> + vaddr_t vaddr = (vaddr_t)ptr;
> +
> + return ((vaddr >= FIXMAP_ADDR(FIXMAP_ACPI_BEGIN)) &&
> + (vaddr < (FIXMAP_ADDR(FIXMAP_ACPI_END) + PAGE_SIZE)));
> +}
> +
> /* True to indicate PSCI 0.2+ is implemented */
> bool __init acpi_psci_present(void)
> {
> diff --git a/xen/arch/x86/acpi/lib.c b/xen/arch/x86/acpi/lib.c
> index 265b9ad81905..a22414a05c13 100644
> --- a/xen/arch/x86/acpi/lib.c
> +++ b/xen/arch/x86/acpi/lib.c
> @@ -46,6 +46,10 @@ char *__acpi_map_table(paddr_t phys, unsigned long size)
> if ((phys + size) <= (1 * 1024 * 1024))
> return __va(phys);
>
> + /* No further arch specific implementation after early boot */
> + if (system_state >= SYS_STATE_boot)
> + return NULL;
> +
> offset = phys & (PAGE_SIZE - 1);
> mapped_size = PAGE_SIZE - offset;
> set_fixmap(FIX_ACPI_END, phys);
> @@ -66,6 +70,20 @@ char *__acpi_map_table(paddr_t phys, unsigned long size)
> return ((char *) base + offset);
> }
>
> +bool __acpi_unmap_table(const void *ptr, unsigned long size)
> +{
> + unsigned long vaddr = (unsigned long)ptr;
> +
> + if ((vaddr >= DIRECTMAP_VIRT_START) &&
> + (vaddr < DIRECTMAP_VIRT_END)) {
> + ASSERT(!((__pa(ptr) + size - 1) >> 20));
> + return true;
> + }
> +
> + return ((vaddr >= __fix_to_virt(FIX_ACPI_END)) &&
> + (vaddr < (__fix_to_virt(FIX_ACPI_BEGIN) + PAGE_SIZE)));
> +}
> +
> unsigned int acpi_get_processor_id(unsigned int cpu)
> {
> unsigned int acpiid, apicid;
> diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
> index 4c8bb7839eda..389505f78666 100644
> --- a/xen/drivers/acpi/osl.c
> +++ b/xen/drivers/acpi/osl.c
> @@ -92,27 +92,29 @@ acpi_physical_address __init
> acpi_os_get_root_pointer(void)
> void __iomem *
> acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
> {
> - if (system_state >= SYS_STATE_boot) {
> - mfn_t mfn = _mfn(PFN_DOWN(phys));
> - unsigned int offs = phys & (PAGE_SIZE - 1);
> -
> - /* The low first Mb is always mapped on x86. */
> - if (IS_ENABLED(CONFIG_X86) && !((phys + size - 1) >> 20))
> - return __va(phys);
> - return __vmap(&mfn, PFN_UP(offs + size), 1, 1,
> - ACPI_MAP_MEM_ATTR, VMAP_DEFAULT) + offs;
> - }
> - return __acpi_map_table(phys, size);
> + void *ptr;
> + mfn_t mfn = _mfn(PFN_DOWN(phys));
> + unsigned int offs = PAGE_OFFSET(phys);
> +
> + /* Try the arch specific implementation first */
> + ptr = __acpi_map_table(phys, size);
> + if (ptr)
> + return ptr;
> +
> + /* No common implementation for early boot map */
> + if (unlikely(system_state < SYS_STATE_boot))
> + return NULL;
> +
> + ptr = __vmap(&mfn, PFN_UP(offs + size), 1, 1,
> + ACPI_MAP_MEM_ATTR, VMAP_DEFAULT);
> +
> + return !ptr ? NULL : (ptr + offs);
> }
>
> void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
> {
> - if (IS_ENABLED(CONFIG_X86) &&
> - (unsigned long)virt >= DIRECTMAP_VIRT_START &&
> - (unsigned long)virt < DIRECTMAP_VIRT_END) {
> - ASSERT(!((__pa(virt) + size - 1) >> 20));
> + if (__acpi_unmap_table(virt, size))
> return;
> - }
>
> if (system_state >= SYS_STATE_boot)
> vunmap((void *)((unsigned long)virt & PAGE_MASK));
> diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h
> index c945ab05c864..21d5e9feb5ae 100644
> --- a/xen/include/xen/acpi.h
> +++ b/xen/include/xen/acpi.h
> @@ -68,6 +68,7 @@ typedef int (*acpi_table_entry_handler) (struct
> acpi_subtable_header *header, co
>
> unsigned int acpi_get_processor_id (unsigned int cpu);
> char * __acpi_map_table (paddr_t phys_addr, unsigned long size);
> +bool __acpi_unmap_table(const void *ptr, unsigned long size);
> int acpi_boot_init (void);
> int acpi_boot_table_init (void);
> int acpi_numa_init (void);
> --
> 2.17.1
>
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