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support an approach without response mail

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This commit is contained in:
Stefan Lankes 2011-12-04 04:47:40 -08:00
parent feaf615724
commit fae93b4304
1 changed files with 12 additions and 1 deletions
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13
arch/x86/mm/svm.c
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@ -36,6 +36,7 @@
#include <asm/svm.h>
#define USE_PERFCOUNTERS 0
#define USE_RESP_MAIL 0
#define SHARED_PAGES (4*(RCCE_SHM_SIZE_MAX >> PAGE_SHIFT))
#define OWNER_SIZE ((SHARED_PAGES * sizeof(uint8_t) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
@ -290,6 +291,7 @@ int svm_access_request(size_t addr)
icc_send_gic_irq(remote_rank);
request[remote_rank]++;
#if USE_RESP_MAIL
#if USE_PERFCOUNTERS
uint64_t wait_start = rdtsc();
#endif
@ -304,6 +306,13 @@ int svm_access_request(size_t addr)
max_wait = res;
#endif
#else
while (page_owner[pageid] != RCCE_IAM) {
icc_mail_check();
NOP8;
}
#endif
addr &= 0xFFFFF000; // align address to page boundary
ret = change_page_permissions(addr, addr + PAGE_SIZE, VMA_READ|VMA_WRITE|VMA_CACHEABLE);
@ -524,13 +533,15 @@ int svm_emit_page(size_t phyaddr, int ue)
svm_flush(phyaddr);
#if USE_RESP_MAIL
// send response back to ue
// ue is polling for the response => no irq is needed
iRCCE_mail_send(0, SVM_RESP, 0, NULL, ue);
#endif
emit[ue]++;
viraddr = phys2virt[pageid];
page_owner[pageid] = ue;
viraddr = phys2virt[pageid];
change_page_permissions(viraddr, viraddr+PAGE_SIZE, VMA_NOACCESS|VMA_READ|VMA_CACHEABLE);
}