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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu
Michael Ellerman
parent
4dea2d1a92
commit
180fe15a82
@ -7,11 +7,185 @@
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "vas: " fmt
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include "vas.h"
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/*
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* Compute the paste address region for the window @window using the
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* ->paste_base_addr and ->paste_win_id_shift we got from device tree.
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*/
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static void compute_paste_address(struct vas_window *window, u64 *addr, int *len)
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{
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int winid;
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u64 base, shift;
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base = window->vinst->paste_base_addr;
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shift = window->vinst->paste_win_id_shift;
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winid = window->winid;
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*addr = base + (winid << shift);
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if (len)
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*len = PAGE_SIZE;
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pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr);
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}
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static inline void get_hvwc_mmio_bar(struct vas_window *window,
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u64 *start, int *len)
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{
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u64 pbaddr;
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pbaddr = window->vinst->hvwc_bar_start;
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*start = pbaddr + window->winid * VAS_HVWC_SIZE;
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*len = VAS_HVWC_SIZE;
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}
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static inline void get_uwc_mmio_bar(struct vas_window *window,
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u64 *start, int *len)
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{
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u64 pbaddr;
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pbaddr = window->vinst->uwc_bar_start;
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*start = pbaddr + window->winid * VAS_UWC_SIZE;
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*len = VAS_UWC_SIZE;
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}
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/*
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* Map the paste bus address of the given send window into kernel address
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* space. Unlike MMIO regions (map_mmio_region() below), paste region must
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* be mapped cache-able and is only applicable to send windows.
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*/
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void *map_paste_region(struct vas_window *txwin)
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{
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int len;
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void *map;
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char *name;
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u64 start;
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name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id,
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txwin->winid);
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if (!name)
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goto free_name;
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txwin->paste_addr_name = name;
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compute_paste_address(txwin, &start, &len);
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if (!request_mem_region(start, len, name)) {
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pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n",
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__func__, start, len);
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goto free_name;
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}
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map = ioremap_cache(start, len);
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if (!map) {
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pr_devel("%s(): ioremap_cache(0x%llx, %d) failed\n", __func__,
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start, len);
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goto free_name;
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}
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pr_devel("Mapped paste addr 0x%llx to kaddr 0x%p\n", start, map);
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return map;
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free_name:
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kfree(name);
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return ERR_PTR(-ENOMEM);
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}
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static void *map_mmio_region(char *name, u64 start, int len)
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{
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void *map;
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if (!request_mem_region(start, len, name)) {
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pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n",
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__func__, start, len);
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return NULL;
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}
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map = ioremap(start, len);
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if (!map) {
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pr_devel("%s(): ioremap(0x%llx, %d) failed\n", __func__, start,
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len);
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return NULL;
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}
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return map;
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}
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static void unmap_region(void *addr, u64 start, int len)
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{
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iounmap(addr);
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release_mem_region((phys_addr_t)start, len);
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}
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/*
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* Unmap the paste address region for a window.
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*/
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void unmap_paste_region(struct vas_window *window)
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{
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int len;
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u64 busaddr_start;
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if (window->paste_kaddr) {
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compute_paste_address(window, &busaddr_start, &len);
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unmap_region(window->paste_kaddr, busaddr_start, len);
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window->paste_kaddr = NULL;
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kfree(window->paste_addr_name);
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window->paste_addr_name = NULL;
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}
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}
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/*
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* Unmap the MMIO regions for a window.
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*/
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static void unmap_winctx_mmio_bars(struct vas_window *window)
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{
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int len;
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u64 busaddr_start;
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if (window->hvwc_map) {
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get_hvwc_mmio_bar(window, &busaddr_start, &len);
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unmap_region(window->hvwc_map, busaddr_start, len);
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window->hvwc_map = NULL;
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}
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if (window->uwc_map) {
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get_uwc_mmio_bar(window, &busaddr_start, &len);
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unmap_region(window->uwc_map, busaddr_start, len);
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window->uwc_map = NULL;
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}
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}
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/*
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* Find the Hypervisor Window Context (HVWC) MMIO Base Address Region and the
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* OS/User Window Context (UWC) MMIO Base Address Region for the given window.
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* Map these bus addresses and save the mapped kernel addresses in @window.
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*/
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int map_winctx_mmio_bars(struct vas_window *window)
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{
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int len;
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u64 start;
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get_hvwc_mmio_bar(window, &start, &len);
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window->hvwc_map = map_mmio_region("HVWCM_Window", start, len);
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get_uwc_mmio_bar(window, &start, &len);
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window->uwc_map = map_mmio_region("UWCM_Window", start, len);
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if (!window->hvwc_map || !window->uwc_map) {
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unmap_winctx_mmio_bars(window);
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return -1;
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}
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return 0;
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}
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/* stub for now */
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int vas_win_close(struct vas_window *window)
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{
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