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arch/tile: Allow tilegx to build with either 16K or 64K page size

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This change introduces new flags for the hv_install_context()
API that passes a page table pointer to the hypervisor.  Clients
can explicitly request 4K, 16K, or 64K small pages when they
install a new context.  In practice, the page size is fixed at
kernel compile time and the same size is always requested every
time a new page table is installed.

The <hv/hypervisor.h> header changes so that it provides more abstract
macros for managing "page" things like PFNs and page tables.  For
example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old
HV_PAGE_SIZE_SMALL.  The various PFN routines have been eliminated and
only PA- or PTFN-based ones remain (since PTFNs are always expressed
in fixed 2KB "page" size).  The page-table management macros are
renamed with a leading underscore and take page-size arguments with
the presumption that clients will use those macros in some single
place to provide the "real" macros they will use themselves.

I happened to notice the old hv_set_caching() API was totally broken
(it assumed 4KB pages) so I changed it so it would nominally work
correctly with other page sizes.

Tag modules with the page size so you can't load a module built with
a conflicting page size.  (And add a test for SMP while we're at it.)

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-03-29 13:58:43 -04:00
parent 47d632f9f8
commit d5d14ed6f2
20 changed files with 345 additions and 197 deletions
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7
arch/tile/kernel/machine_kexec.c
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@@ -251,6 +251,7 @@ static void setup_quasi_va_is_pa(void)
void machine_kexec(struct kimage *image)
{
void *reboot_code_buffer;
pte_t *ptep;
void (*rnk)(unsigned long, void *, unsigned long)
__noreturn;
@@ -266,8 +267,10 @@ void machine_kexec(struct kimage *image)
*/
homecache_change_page_home(image->control_code_page, 0,
smp_processor_id());
reboot_code_buffer = vmap(&image->control_code_page, 1, 0,
__pgprot(_PAGE_KERNEL | _PAGE_EXECUTABLE));
reboot_code_buffer = page_address(image->control_code_page);
BUG_ON(reboot_code_buffer == NULL);
ptep = virt_to_pte(NULL, (unsigned long)reboot_code_buffer);
__set_pte(ptep, pte_mkexec(*ptep));
memcpy(reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
__flush_icache_range(