From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751547AbdHXGid (ORCPT ); Thu, 24 Aug 2017 02:38:33 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:50561 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751183AbdHXGi3 (ORCPT ); Thu, 24 Aug 2017 02:38:29 -0400 From: Sukadev Bhattiprolu To: Michael Ellerman Cc: Benjamin Herrenschmidt , mikey@neuling.org, stewart@linux.vnet.ibm.com, apopple@au1.ibm.com, hbabu@us.ibm.com, oohall@gmail.com, linuxppc-dev@ozlabs.org, Subject: [PATCH v7 04/12] powerpc/vas: Define helpers to access MMIO regions Date: Wed, 23 Aug 2017 23:38:00 -0700 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1503556688-15412-1-git-send-email-sukadev@linux.vnet.ibm.com> References: <1503556688-15412-1-git-send-email-sukadev@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17082406-0048-0000-0000-000001D8A49C X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007601; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000224; SDB=6.00906836; UDB=6.00454554; IPR=6.00687033; BA=6.00005550; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016840; XFM=3.00000015; UTC=2017-08-24 06:38:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082406-0049-0000-0000-0000425579FC Message-Id: <1503556688-15412-5-git-send-email-sukadev@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-08-24_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1708240106 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- Changelog [v6]: - Minor reorg to make setup/cleanup functions more symmetric Changelog [v5]: - [Ben Herrenschmidt]: Need cachable mapping for paste regions and non-cachable mapping for the MMIO regions. So, just use ioremap() for mapping the MMIO regions; use "winctx" instead of "wc" to avoid collision with "write combine". Changelog [v3]: - Minor reorg/cleanup of map/unmap functions Changelog [v2]: - Get HVWC, UWC and paste addresses from window->vinst (i.e DT) rather than kernel macros. --- arch/powerpc/platforms/powernv/vas-window.c | 173 ++++++++++++++++++++++++++++ 1 file changed, 173 insertions(+) diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 6156fbe..a3a705a 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -9,9 +9,182 @@ #include #include +#include +#include #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. + */ +void compute_paste_address(struct vas_window *window, uint64_t *addr, int *len) +{ + uint64_t base, shift; + int winid; + + 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, + uint64_t *start, int *len) +{ + uint64_t 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, + uint64_t *start, int *len) +{ + uint64_t 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 rc, len; + void *map; + char *name; + uint64_t start; + + rc = -ENOMEM; + name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id, + txwin->winid); + if (!name) + return ERR_PTR(rc); + + 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("VAS: mapped paste addr 0x%llx to kaddr 0x%p\n", start, map); + return map; + +free_name: + kfree(name); + return ERR_PTR(rc); +} + + +static void *map_mmio_region(char *name, uint64_t 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, uint64_t 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; + uint64_t 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; + uint64_t 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; + uint64_t 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 */ int vas_win_close(struct vas_window *window) { -- 2.7.4