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xen/arm: remove handling of XENFEAT_grant_map_identity

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The feature has been removed from Xen. Also Linux cannot use it on ARM32
without CONFIG_ARM_LPAE.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Stefano Stabellini 2014-11-11 11:14:45 +00:00 committed by David Vrabel
parent 009d0431c3
commit e9e87eb3f9
3 changed files with 1 additions and 92 deletions
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5
arch/arm/xen/enlighten.c
View File

@ -261,11 +261,6 @@ static int __init xen_guest_init(void)
xen_setup_features();
if (!xen_feature(XENFEAT_grant_map_identity)) {
pr_warn("Please upgrade your Xen.\n"
"If your platform has any non-coherent DMA devices, they won't work properly.\n");
}
if (xen_feature(XENFEAT_dom0))
xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
else

85
arch/arm/xen/mm32.c
View File

@ -5,70 +5,6 @@
#include <xen/features.h>
static DEFINE_PER_CPU(unsigned long, xen_mm32_scratch_virt);
static DEFINE_PER_CPU(pte_t *, xen_mm32_scratch_ptep);
static int alloc_xen_mm32_scratch_page(int cpu)
{
struct page *page;
unsigned long virt;
pmd_t *pmdp;
pte_t *ptep;
if (per_cpu(xen_mm32_scratch_ptep, cpu) != NULL)
return 0;
page = alloc_page(GFP_KERNEL);
if (page == NULL) {
pr_warn("Failed to allocate xen_mm32_scratch_page for cpu %d\n", cpu);
return -ENOMEM;
}
virt = (unsigned long)__va(page_to_phys(page));
pmdp = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
ptep = pte_offset_kernel(pmdp, virt);
per_cpu(xen_mm32_scratch_virt, cpu) = virt;
per_cpu(xen_mm32_scratch_ptep, cpu) = ptep;
return 0;
}
static int xen_mm32_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
int cpu = (long)hcpu;
switch (action) {
case CPU_UP_PREPARE:
if (alloc_xen_mm32_scratch_page(cpu))
return NOTIFY_BAD;
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block xen_mm32_cpu_notifier = {
.notifier_call = xen_mm32_cpu_notify,
};
static void* xen_mm32_remap_page(dma_addr_t handle)
{
unsigned long virt = get_cpu_var(xen_mm32_scratch_virt);
pte_t *ptep = __get_cpu_var(xen_mm32_scratch_ptep);
*ptep = pfn_pte(handle >> PAGE_SHIFT, PAGE_KERNEL);
local_flush_tlb_kernel_page(virt);
return (void*)virt;
}
static void xen_mm32_unmap(void *vaddr)
{
put_cpu_var(xen_mm32_scratch_virt);
}
/* functions called by SWIOTLB */
@ -88,13 +24,7 @@ static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
if (!pfn_valid(pfn))
{
/* Cannot map the page, we don't know its physical address.
* Return and hope for the best */
if (!xen_feature(XENFEAT_grant_map_identity))
return;
vaddr = xen_mm32_remap_page(handle) + offset;
op(vaddr, len, dir);
xen_mm32_unmap(vaddr - offset);
/* TODO: cache flush */
} else {
struct page *page = pfn_to_page(pfn);
@ -181,22 +111,9 @@ void xen_dma_sync_single_for_device(struct device *hwdev,
int __init xen_mm32_init(void)
{
int cpu;
if (!xen_initial_domain())
return 0;
register_cpu_notifier(&xen_mm32_cpu_notifier);
get_online_cpus();
for_each_online_cpu(cpu) {
if (alloc_xen_mm32_scratch_page(cpu)) {
put_online_cpus();
unregister_cpu_notifier(&xen_mm32_cpu_notifier);
return -ENOMEM;
}
}
put_online_cpus();
return 0;
}
arch_initcall(xen_mm32_init);

3
include/xen/interface/features.h
View File

@ -53,9 +53,6 @@
/* operation as Dom0 is supported */
#define XENFEAT_dom0 11
/* Xen also maps grant references at pfn = mfn */
#define XENFEAT_grant_map_identity 12
#define XENFEAT_NR_SUBMAPS 1
#endif /* __XEN_PUBLIC_FEATURES_H__ */