Commit 180fe15a authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Michael Ellerman

powerpc/powernv/vas: Define helpers to access MMIO regions

Define some helper functions to access the MMIO regions. We use these
in follow-on patches to read/write VAS hardware registers. They are
also used to later issue 'paste' instructions to submit requests to
the NX hardware engines.
Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 4dea2d1a
...@@ -7,11 +7,185 @@ ...@@ -7,11 +7,185 @@
* 2 of the License, or (at your option) any later version. * 2 of the License, or (at your option) any later version.
*/ */
#define pr_fmt(fmt) "vas: " fmt
#include <linux/types.h> #include <linux/types.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/io.h>
#include "vas.h" #include "vas.h"
/*
* Compute the paste address region for the window @window using the
* ->paste_base_addr and ->paste_win_id_shift we got from device tree.
*/
static void compute_paste_address(struct vas_window *window, u64 *addr, int *len)
{
int winid;
u64 base, shift;
base = window->vinst->paste_base_addr;
shift = window->vinst->paste_win_id_shift;
winid = window->winid;
*addr = base + (winid << shift);
if (len)
*len = PAGE_SIZE;
pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr);
}
static inline void get_hvwc_mmio_bar(struct vas_window *window,
u64 *start, int *len)
{
u64 pbaddr;
pbaddr = window->vinst->hvwc_bar_start;
*start = pbaddr + window->winid * VAS_HVWC_SIZE;
*len = VAS_HVWC_SIZE;
}
static inline void get_uwc_mmio_bar(struct vas_window *window,
u64 *start, int *len)
{
u64 pbaddr;
pbaddr = window->vinst->uwc_bar_start;
*start = pbaddr + window->winid * VAS_UWC_SIZE;
*len = VAS_UWC_SIZE;
}
/*
* Map the paste bus address of the given send window into kernel address
* space. Unlike MMIO regions (map_mmio_region() below), paste region must
* be mapped cache-able and is only applicable to send windows.
*/
void *map_paste_region(struct vas_window *txwin)
{
int len;
void *map;
char *name;
u64 start;
name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id,
txwin->winid);
if (!name)
goto free_name;
txwin->paste_addr_name = name;
compute_paste_address(txwin, &start, &len);
if (!request_mem_region(start, len, name)) {
pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n",
__func__, start, len);
goto free_name;
}
map = ioremap_cache(start, len);
if (!map) {
pr_devel("%s(): ioremap_cache(0x%llx, %d) failed\n", __func__,
start, len);
goto free_name;
}
pr_devel("Mapped paste addr 0x%llx to kaddr 0x%p\n", start, map);
return map;
free_name:
kfree(name);
return ERR_PTR(-ENOMEM);
}
static void *map_mmio_region(char *name, u64 start, int len)
{
void *map;
if (!request_mem_region(start, len, name)) {
pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n",
__func__, start, len);
return NULL;
}
map = ioremap(start, len);
if (!map) {
pr_devel("%s(): ioremap(0x%llx, %d) failed\n", __func__, start,
len);
return NULL;
}
return map;
}
static void unmap_region(void *addr, u64 start, int len)
{
iounmap(addr);
release_mem_region((phys_addr_t)start, len);
}
/*
* Unmap the paste address region for a window.
*/
void unmap_paste_region(struct vas_window *window)
{
int len;
u64 busaddr_start;
if (window->paste_kaddr) {
compute_paste_address(window, &busaddr_start, &len);
unmap_region(window->paste_kaddr, busaddr_start, len);
window->paste_kaddr = NULL;
kfree(window->paste_addr_name);
window->paste_addr_name = NULL;
}
}
/*
* Unmap the MMIO regions for a window.
*/
static void unmap_winctx_mmio_bars(struct vas_window *window)
{
int len;
u64 busaddr_start;
if (window->hvwc_map) {
get_hvwc_mmio_bar(window, &busaddr_start, &len);
unmap_region(window->hvwc_map, busaddr_start, len);
window->hvwc_map = NULL;
}
if (window->uwc_map) {
get_uwc_mmio_bar(window, &busaddr_start, &len);
unmap_region(window->uwc_map, busaddr_start, len);
window->uwc_map = NULL;
}
}
/*
* Find the Hypervisor Window Context (HVWC) MMIO Base Address Region and the
* OS/User Window Context (UWC) MMIO Base Address Region for the given window.
* Map these bus addresses and save the mapped kernel addresses in @window.
*/
int map_winctx_mmio_bars(struct vas_window *window)
{
int len;
u64 start;
get_hvwc_mmio_bar(window, &start, &len);
window->hvwc_map = map_mmio_region("HVWCM_Window", start, len);
get_uwc_mmio_bar(window, &start, &len);
window->uwc_map = map_mmio_region("UWCM_Window", start, len);
if (!window->hvwc_map || !window->uwc_map) {
unmap_winctx_mmio_bars(window);
return -1;
}
return 0;
}
/* stub for now */ /* stub for now */
int vas_win_close(struct vas_window *window) int vas_win_close(struct vas_window *window)
{ {
......
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