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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/drivers/misc/genwqe/card_utils.c
....@@ -1,4 +1,5 @@
1
-/**
1
+// SPDX-License-Identifier: GPL-2.0-only
2
+/*
23  * IBM Accelerator Family 'GenWQE'
34  *
45  * (C) Copyright IBM Corp. 2013
....@@ -7,15 +8,6 @@
78  * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
89  * Author: Michael Jung <mijung@gmx.net>
910  * Author: Michael Ruettger <michael@ibmra.de>
10
- *
11
- * This program is free software; you can redistribute it and/or modify
12
- * it under the terms of the GNU General Public License (version 2 only)
13
- * as published by the Free Software Foundation.
14
- *
15
- * This program is distributed in the hope that it will be useful,
16
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
17
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18
- * GNU General Public License for more details.
1911  */
2012 
2113 /*
....@@ -23,21 +15,19 @@
2315  */
2416 
2517 #include <linux/kernel.h>
26
-#include <linux/dma-mapping.h>
2718 #include <linux/sched.h>
2819 #include <linux/vmalloc.h>
2920 #include <linux/page-flags.h>
3021 #include <linux/scatterlist.h>
3122 #include <linux/hugetlb.h>
3223 #include <linux/iommu.h>
33
-#include <linux/delay.h>
3424 #include <linux/pci.h>
3525 #include <linux/dma-mapping.h>
3626 #include <linux/ctype.h>
3727 #include <linux/module.h>
3828 #include <linux/platform_device.h>
3929 #include <linux/delay.h>
40
-#include <asm/pgtable.h>
30
+#include <linux/pgtable.h>
4131 
4232 #include "genwqe_driver.h"
4333 #include "card_base.h"
....@@ -139,6 +129,9 @@
139129 
140130 /**
141131  * genwqe_read_app_id() - Extract app_id
132
+ * @cd:	        genwqe device descriptor
133
+ * @app_name:   carrier used to pass-back name
134
+ * @len:        length of data for name
142135  *
143136  * app_unitcfg need to be filled with valid data first
144137  */
....@@ -193,7 +186,7 @@
193186  * @init:       initial crc (0xffffffff at start)
194187  *
195188  * polynomial = x^32 * + x^29 + x^18 + x^14 + x^3 + 1 (0x20044009)
196
-
189
+ *
197190  * Example: 4 bytes 0x01 0x02 0x03 0x04 with init=0xffffffff should
198191  * result in a crc32 of 0xf33cb7d3.
199192  *
....@@ -220,8 +213,8 @@
220213 	if (get_order(size) >= MAX_ORDER)
221214 		return NULL;
222215 
223
-	return dma_zalloc_coherent(&cd->pci_dev->dev, size, dma_handle,
224
-				   GFP_KERNEL);
216
+	return dma_alloc_coherent(&cd->pci_dev->dev, size, dma_handle,
217
+				  GFP_KERNEL);
225218 }
226219 
227220 void __genwqe_free_consistent(struct genwqe_dev *cd, size_t size,
....@@ -287,7 +280,7 @@
287280 	return roundup(len, PAGE_SIZE);
288281 }
289282 
290
-/**
283
+/*
291284  * genwqe_alloc_sync_sgl() - Allocate memory for sgl and overlapping pages
292285  *
293286  * Allocates memory for sgl and overlapping pages. Pages which might
....@@ -470,6 +463,8 @@
470463 
471464 /**
472465  * genwqe_free_sync_sgl() - Free memory for sgl and overlapping pages
466
+ * @cd:	        genwqe device descriptor
467
+ * @sgl:        scatter gather list describing user-space memory
473468  *
474469  * After the DMA transfer has been completed we free the memory for
475470  * the sgl and the cached pages. Data is being transferred from cached
....@@ -522,30 +517,6 @@
522517 	sgl->sgl_dma_addr = 0x0;
523518 	sgl->sgl_size = 0;
524519 	return rc;
525
-}
526
-
527
-/**
528
- * genwqe_free_user_pages() - Give pinned pages back
529
- *
530
- * Documentation of get_user_pages is in mm/gup.c:
531
- *
532
- * If the page is written to, set_page_dirty (or set_page_dirty_lock,
533
- * as appropriate) must be called after the page is finished with, and
534
- * before put_page is called.
535
- */
536
-static int genwqe_free_user_pages(struct page **page_list,
537
-			unsigned int nr_pages, int dirty)
538
-{
539
-	unsigned int i;
540
-
541
-	for (i = 0; i < nr_pages; i++) {
542
-		if (page_list[i] != NULL) {
543
-			if (dirty)
544
-				set_page_dirty_lock(page_list[i]);
545
-			put_page(page_list[i]);
546
-		}
547
-	}
548
-	return 0;
549520 }
550521 
551522 /**
....@@ -607,18 +578,18 @@
607578 	m->dma_list = (dma_addr_t *)(m->page_list + m->nr_pages);
608579 
609580 	/* pin user pages in memory */
610
-	rc = get_user_pages_fast(data & PAGE_MASK, /* page aligned addr */
581
+	rc = pin_user_pages_fast(data & PAGE_MASK, /* page aligned addr */
611582 				 m->nr_pages,
612
-				 m->write,		/* readable/writable */
583
+				 m->write ? FOLL_WRITE : 0,	/* readable/writable */
613584 				 m->page_list);	/* ptrs to pages */
614585 	if (rc < 0)
615
-		goto fail_get_user_pages;
586
+		goto fail_pin_user_pages;
616587 
617
-	/* assumption: get_user_pages can be killed by signals. */
588
+	/* assumption: pin_user_pages can be killed by signals. */
618589 	if (rc < m->nr_pages) {
619
-		genwqe_free_user_pages(m->page_list, rc, m->write);
590
+		unpin_user_pages_dirty_lock(m->page_list, rc, m->write);
620591 		rc = -EFAULT;
621
-		goto fail_get_user_pages;
592
+		goto fail_pin_user_pages;
622593 	}
623594 
624595 	rc = genwqe_map_pages(cd, m->page_list, m->nr_pages, m->dma_list);
....@@ -628,9 +599,9 @@
628599 	return 0;
629600 
630601  fail_free_user_pages:
631
-	genwqe_free_user_pages(m->page_list, m->nr_pages, m->write);
602
+	unpin_user_pages_dirty_lock(m->page_list, m->nr_pages, m->write);
632603 
633
- fail_get_user_pages:
604
+ fail_pin_user_pages:
634605 	kfree(m->page_list);
635606 	m->page_list = NULL;
636607 	m->dma_list = NULL;
....@@ -660,8 +631,8 @@
660631 		genwqe_unmap_pages(cd, m->dma_list, m->nr_pages);
661632 
662633 	if (m->page_list) {
663
-		genwqe_free_user_pages(m->page_list, m->nr_pages, m->write);
664
-
634
+		unpin_user_pages_dirty_lock(m->page_list, m->nr_pages,
635
+					    m->write);
665636 		kfree(m->page_list);
666637 		m->page_list = NULL;
667638 		m->dma_list = NULL;
....@@ -744,6 +715,7 @@
744715 /**
745716  * genwqe_set_interrupt_capability() - Configure MSI capability structure
746717  * @cd:         pointer to the device
718
+ * @count:      number of vectors to allocate
747719  * Return: 0 if no error
748720  */
749721 int genwqe_set_interrupt_capability(struct genwqe_dev *cd, int count)
....@@ -772,7 +744,7 @@
772744  * @i:          index to desired entry
773745  * @m:          maximum possible entries
774746  * @addr:       addr which is read
775
- * @index:      index in debug array
747
+ * @idx:        index in debug array
776748  * @val:        read value
777749  */
778750 static int set_reg_idx(struct genwqe_dev *cd, struct genwqe_reg *r,
....@@ -852,6 +824,8 @@
852824 
853825 /**
854826  * genwqe_ffdc_buff_size() - Calculates the number of dump registers
827
+ * @cd:	        genwqe device descriptor
828
+ * @uid:	unit ID
855829  */
856830 int genwqe_ffdc_buff_size(struct genwqe_dev *cd, int uid)
857831 {
....@@ -905,6 +879,10 @@
905879 
906880 /**
907881  * genwqe_ffdc_buff_read() - Implements LogoutExtendedErrorRegisters procedure
882
+ * @cd:	        genwqe device descriptor
883
+ * @uid:	unit ID
884
+ * @regs:       register information
885
+ * @max_regs:   number of register entries
908886  */
909887 int genwqe_ffdc_buff_read(struct genwqe_dev *cd, int uid,
910888 			  struct genwqe_reg *regs, unsigned int max_regs)
....@@ -990,6 +968,10 @@
990968 
991969 /**
992970  * genwqe_write_vreg() - Write register in virtual window
971
+ * @cd:	        genwqe device descriptor
972
+ * @reg:	register (byte) offset within BAR
973
+ * @val:	value to write
974
+ * @func:	PCI virtual function
993975  *
994976  * Note, these registers are only accessible to the PF through the
995977  * VF-window. It is not intended for the VF to access.
....@@ -1003,6 +985,9 @@
1003985 
1004986 /**
1005987  * genwqe_read_vreg() - Read register in virtual window
988
+ * @cd:	        genwqe device descriptor
989
+ * @reg:	register (byte) offset within BAR
990
+ * @func:	PCI virtual function
1006991  *
1007992  * Note, these registers are only accessible to the PF through the
1008993  * VF-window. It is not intended for the VF to access.
....@@ -1015,6 +1000,7 @@
10151000 
10161001 /**
10171002  * genwqe_base_clock_frequency() - Deteremine base clock frequency of the card
1003
+ * @cd:	        genwqe device descriptor
10181004  *
10191005  * Note: From a design perspective it turned out to be a bad idea to
10201006  * use codes here to specifiy the frequency/speed values. An old
....@@ -1039,6 +1025,7 @@
10391025 
10401026 /**
10411027  * genwqe_stop_traps() - Stop traps
1028
+ * @cd:	        genwqe device descriptor
10421029  *
10431030  * Before reading out the analysis data, we need to stop the traps.
10441031  */
....@@ -1049,6 +1036,7 @@
10491036 
10501037 /**
10511038  * genwqe_start_traps() - Start traps
1039
+ * @cd:	        genwqe device descriptor
10521040  *
10531041  * After having read the data, we can/must enable the traps again.
10541042  */