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2008-08-20x86, SGI UV: hardcode the TLB flush interrupt system vectorCliff Wickman
The UV TLB shootdown mechanism needs a system interrupt vector. Its vector had been hardcoded as 200, but needs to moved to the reserved system vector range so that it does not collide with some device vector. This is still temporary until dynamic system IRQ allocation is provided. But it will be needed when real UV hardware becomes available and runs 2.6.27. Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08x86, SGI UV: uv_ptc_proc_write fixCliff Wickman
Someone could write 0 bytes to /proc/sgi_uv/ptc_statistics, causing optstr[count - 1] = '\0'; to write to who-knows-where. (Andi Kleen noticed this need from a patch I sent for similar code in the ia64 world (sn2_ptc_proc_write()).) (count less than zero is not possible here, as count is unsigned) Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08x86, SGI UV: TLB shootdown using broadcast assist unit, v6Cliff Wickman
v6: 6/19 close the security hole in uv_ptc_proc_write()) > Found a potential security hole while doing that: > static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user, > size_t count, loff_t *data) > if (copy_from_user(optstr, user, count)) > return -EFAULT; > > is count guaranteed to never be larger than 64? is fixed below. It adds tlb_uv.o to the Makefile. Signed-off-by: Cliff Wickman <cpw@sgi.com> Cc: mingo@elte.hu Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08SGI UV: TLB shootdown using broadcast assist unit, fixIngo Molnar
fix: arch/x86/kernel/tlb_uv.c: In function ‘uv_table_bases_init': arch/x86/kernel/tlb_uv.c:612: error: ‘bau_tabsp' undeclared (first use in this function) arch/x86/kernel/tlb_uv.c:612: error: (Each undeclared identifier is reported only once arch/x86/kernel/tlb_uv.c:612: error: for each function it appears in.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08SGI UV: clean up arch/x86/kernel/tlb_uv.cIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08SGI UV: TLB shootdown using broadcast assist unitIngo Molnar
TLB shootdown for SGI UV. v5: 6/12 corrections/improvements per Ingo's second review Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08SGI UV: TLB shootdown using broadcast assist unit, cleanupsCliff Wickman
TLB shootdown for SGI UV. v1: 6/2 original v2: 6/3 corrections/improvements per Ingo's review v3: 6/4 split atomic operations off to a separate patch (Jeremy's review) v4: 6/12 include <mach_apic.h> rather than <asm/mach-bigsmp/mach_apic.h> (fixes a !SMP build problem that Ingo found) fix the index on uv_table_bases[blade] Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08x86, SGI UV: TLB shootdown using broadcast assist unitCliff Wickman
TLB shootdown for SGI UV. Depends on patch (in tip/x86/irq): x86-update-macros-used-by-uv-platform.patch Jack Steiner May 29 This patch provides the ability to flush TLB's in cpu's that are not on the local node. The hardware mechanism for distributing the flush messages is the UV's "broadcast assist unit". The hook to intercept TLB shootdown requests is a 2-line change to native_flush_tlb_others() (arch/x86/kernel/tlb_64.c). This code has been tested on a hardware simulator. The real hardware is not yet available. The shootdown statistics are provided through /proc/sgi_uv/ptc_statistics. The use of /sys was considered, but would have required the use of many /sys files. The debugfs was also considered, but these statistics should be available on an ongoing basis, not just for debugging. Issues to be fixed later: - The IRQ for the messaging interrupt is currently hardcoded as 200 (see UV_BAU_MESSAGE). It should be dynamically assigned in the future. - The use of appropriate udelay()'s is untested, as they are a problem in the simulator. Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>