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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /arch/parisc/kernel/pci-dma.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ...
Diffstat (limited to 'arch/parisc/kernel/pci-dma.c')
-rw-r--r--arch/parisc/kernel/pci-dma.c456
1 files changed, 456 insertions, 0 deletions
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
new file mode 100644
index 000000000..ba87f7913
--- /dev/null
+++ b/arch/parisc/kernel/pci-dma.c
@@ -0,0 +1,456 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+** PARISC 1.1 Dynamic DMA mapping support.
+** This implementation is for PA-RISC platforms that do not support
+** I/O TLBs (aka DMA address translation hardware).
+** See Documentation/core-api/dma-api-howto.rst for interface definitions.
+**
+** (c) Copyright 1999,2000 Hewlett-Packard Company
+** (c) Copyright 2000 Grant Grundler
+** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
+** (c) Copyright 2000 John Marvin
+**
+** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
+** (I assume it's from David Mosberger-Tang but there was no Copyright)
+**
+** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
+**
+** - ggg
+*/
+
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/dma-direct.h>
+#include <linux/dma-map-ops.h>
+
+#include <asm/cacheflush.h>
+#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
+#include <asm/io.h>
+#include <asm/page.h> /* get_order */
+#include <linux/uaccess.h>
+#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
+
+static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
+static unsigned long pcxl_used_bytes __read_mostly;
+static unsigned long pcxl_used_pages __read_mostly;
+
+extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
+static DEFINE_SPINLOCK(pcxl_res_lock);
+static char *pcxl_res_map;
+static int pcxl_res_hint;
+static int pcxl_res_size;
+
+#ifdef DEBUG_PCXL_RESOURCE
+#define DBG_RES(x...) printk(x)
+#else
+#define DBG_RES(x...)
+#endif
+
+
+/*
+** Dump a hex representation of the resource map.
+*/
+
+#ifdef DUMP_RESMAP
+static
+void dump_resmap(void)
+{
+ u_long *res_ptr = (unsigned long *)pcxl_res_map;
+ u_long i = 0;
+
+ printk("res_map: ");
+ for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
+ printk("%08lx ", *res_ptr);
+
+ printk("\n");
+}
+#else
+static inline void dump_resmap(void) {;}
+#endif
+
+static inline int map_pte_uncached(pte_t * pte,
+ unsigned long vaddr,
+ unsigned long size, unsigned long *paddr_ptr)
+{
+ unsigned long end;
+ unsigned long orig_vaddr = vaddr;
+
+ vaddr &= ~PMD_MASK;
+ end = vaddr + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ do {
+ unsigned long flags;
+
+ if (!pte_none(*pte))
+ printk(KERN_ERR "map_pte_uncached: page already exists\n");
+ purge_tlb_start(flags);
+ set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
+ pdtlb(SR_KERNEL, orig_vaddr);
+ purge_tlb_end(flags);
+ vaddr += PAGE_SIZE;
+ orig_vaddr += PAGE_SIZE;
+ (*paddr_ptr) += PAGE_SIZE;
+ pte++;
+ } while (vaddr < end);
+ return 0;
+}
+
+static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
+ unsigned long size, unsigned long *paddr_ptr)
+{
+ unsigned long end;
+ unsigned long orig_vaddr = vaddr;
+
+ vaddr &= ~PGDIR_MASK;
+ end = vaddr + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ do {
+ pte_t * pte = pte_alloc_kernel(pmd, vaddr);
+ if (!pte)
+ return -ENOMEM;
+ if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
+ return -ENOMEM;
+ vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
+ orig_vaddr += PMD_SIZE;
+ pmd++;
+ } while (vaddr < end);
+ return 0;
+}
+
+static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
+ unsigned long paddr)
+{
+ pgd_t * dir;
+ unsigned long end = vaddr + size;
+
+ dir = pgd_offset_k(vaddr);
+ do {
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ p4d = p4d_offset(dir, vaddr);
+ pud = pud_offset(p4d, vaddr);
+ pmd = pmd_alloc(NULL, pud, vaddr);
+
+ if (!pmd)
+ return -ENOMEM;
+ if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
+ return -ENOMEM;
+ vaddr = vaddr + PGDIR_SIZE;
+ dir++;
+ } while (vaddr && (vaddr < end));
+ return 0;
+}
+
+static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
+ unsigned long size)
+{
+ pte_t * pte;
+ unsigned long end;
+ unsigned long orig_vaddr = vaddr;
+
+ if (pmd_none(*pmd))
+ return;
+ if (pmd_bad(*pmd)) {
+ pmd_ERROR(*pmd);
+ pmd_clear(pmd);
+ return;
+ }
+ pte = pte_offset_map(pmd, vaddr);
+ vaddr &= ~PMD_MASK;
+ end = vaddr + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ do {
+ unsigned long flags;
+ pte_t page = *pte;
+
+ pte_clear(&init_mm, vaddr, pte);
+ purge_tlb_start(flags);
+ pdtlb(SR_KERNEL, orig_vaddr);
+ purge_tlb_end(flags);
+ vaddr += PAGE_SIZE;
+ orig_vaddr += PAGE_SIZE;
+ pte++;
+ if (pte_none(page) || pte_present(page))
+ continue;
+ printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
+ } while (vaddr < end);
+}
+
+static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
+ unsigned long size)
+{
+ pmd_t * pmd;
+ unsigned long end;
+ unsigned long orig_vaddr = vaddr;
+
+ if (pgd_none(*dir))
+ return;
+ if (pgd_bad(*dir)) {
+ pgd_ERROR(*dir);
+ pgd_clear(dir);
+ return;
+ }
+ pmd = pmd_offset(pud_offset(p4d_offset(dir, vaddr), vaddr), vaddr);
+ vaddr &= ~PGDIR_MASK;
+ end = vaddr + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ do {
+ unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
+ vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
+ orig_vaddr += PMD_SIZE;
+ pmd++;
+ } while (vaddr < end);
+}
+
+static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
+{
+ pgd_t * dir;
+ unsigned long end = vaddr + size;
+
+ dir = pgd_offset_k(vaddr);
+ do {
+ unmap_uncached_pmd(dir, vaddr, end - vaddr);
+ vaddr = vaddr + PGDIR_SIZE;
+ dir++;
+ } while (vaddr && (vaddr < end));
+}
+
+#define PCXL_SEARCH_LOOP(idx, mask, size) \
+ for(; res_ptr < res_end; ++res_ptr) \
+ { \
+ if(0 == ((*res_ptr) & mask)) { \
+ *res_ptr |= mask; \
+ idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
+ pcxl_res_hint = idx + (size >> 3); \
+ goto resource_found; \
+ } \
+ }
+
+#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
+ u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
+ u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
+ PCXL_SEARCH_LOOP(idx, mask, size); \
+ res_ptr = (u##size *)&pcxl_res_map[0]; \
+ PCXL_SEARCH_LOOP(idx, mask, size); \
+}
+
+unsigned long
+pcxl_alloc_range(size_t size)
+{
+ int res_idx;
+ u_long mask, flags;
+ unsigned int pages_needed = size >> PAGE_SHIFT;
+
+ mask = (u_long) -1L;
+ mask >>= BITS_PER_LONG - pages_needed;
+
+ DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
+ size, pages_needed, mask);
+
+ spin_lock_irqsave(&pcxl_res_lock, flags);
+
+ if(pages_needed <= 8) {
+ PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
+ } else if(pages_needed <= 16) {
+ PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
+ } else if(pages_needed <= 32) {
+ PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
+ } else {
+ panic("%s: pcxl_alloc_range() Too many pages to map.\n",
+ __FILE__);
+ }
+
+ dump_resmap();
+ panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
+ __FILE__);
+
+resource_found:
+
+ DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
+ res_idx, mask, pcxl_res_hint);
+
+ pcxl_used_pages += pages_needed;
+ pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
+
+ spin_unlock_irqrestore(&pcxl_res_lock, flags);
+
+ dump_resmap();
+
+ /*
+ ** return the corresponding vaddr in the pcxl dma map
+ */
+ return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
+}
+
+#define PCXL_FREE_MAPPINGS(idx, m, size) \
+ u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
+ /* BUG_ON((*res_ptr & m) != m); */ \
+ *res_ptr &= ~m;
+
+/*
+** clear bits in the pcxl resource map
+*/
+static void
+pcxl_free_range(unsigned long vaddr, size_t size)
+{
+ u_long mask, flags;
+ unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
+ unsigned int pages_mapped = size >> PAGE_SHIFT;
+
+ mask = (u_long) -1L;
+ mask >>= BITS_PER_LONG - pages_mapped;
+
+ DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
+ res_idx, size, pages_mapped, mask);
+
+ spin_lock_irqsave(&pcxl_res_lock, flags);
+
+ if(pages_mapped <= 8) {
+ PCXL_FREE_MAPPINGS(res_idx, mask, 8);
+ } else if(pages_mapped <= 16) {
+ PCXL_FREE_MAPPINGS(res_idx, mask, 16);
+ } else if(pages_mapped <= 32) {
+ PCXL_FREE_MAPPINGS(res_idx, mask, 32);
+ } else {
+ panic("%s: pcxl_free_range() Too many pages to unmap.\n",
+ __FILE__);
+ }
+
+ pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
+ pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
+
+ spin_unlock_irqrestore(&pcxl_res_lock, flags);
+
+ dump_resmap();
+}
+
+static int __maybe_unused proc_pcxl_dma_show(struct seq_file *m, void *v)
+{
+#if 0
+ u_long i = 0;
+ unsigned long *res_ptr = (u_long *)pcxl_res_map;
+#endif
+ unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
+
+ seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
+ PCXL_DMA_MAP_SIZE, total_pages);
+
+ seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
+
+ seq_puts(m, " total: free: used: % used:\n");
+ seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
+ pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
+ (pcxl_used_bytes * 100) / pcxl_res_size);
+
+ seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
+ total_pages - pcxl_used_pages, pcxl_used_pages,
+ (pcxl_used_pages * 100 / total_pages));
+
+#if 0
+ seq_puts(m, "\nResource bitmap:");
+
+ for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
+ if ((i & 7) == 0)
+ seq_puts(m,"\n ");
+ seq_printf(m, "%s %08lx", buf, *res_ptr);
+ }
+#endif
+ seq_putc(m, '\n');
+ return 0;
+}
+
+static int __init
+pcxl_dma_init(void)
+{
+ if (pcxl_dma_start == 0)
+ return 0;
+
+ pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
+ pcxl_res_hint = 0;
+ pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
+ get_order(pcxl_res_size));
+ memset(pcxl_res_map, 0, pcxl_res_size);
+ proc_gsc_root = proc_mkdir("gsc", NULL);
+ if (!proc_gsc_root)
+ printk(KERN_WARNING
+ "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
+ else {
+ struct proc_dir_entry* ent;
+ ent = proc_create_single("pcxl_dma", 0, proc_gsc_root,
+ proc_pcxl_dma_show);
+ if (!ent)
+ printk(KERN_WARNING
+ "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
+ }
+ return 0;
+}
+
+__initcall(pcxl_dma_init);
+
+void *arch_dma_alloc(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+{
+ unsigned long vaddr;
+ unsigned long paddr;
+ int order;
+
+ if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
+ return NULL;
+
+ order = get_order(size);
+ size = 1 << (order + PAGE_SHIFT);
+ vaddr = pcxl_alloc_range(size);
+ paddr = __get_free_pages(gfp | __GFP_ZERO, order);
+ flush_kernel_dcache_range(paddr, size);
+ paddr = __pa(paddr);
+ map_uncached_pages(vaddr, size, paddr);
+ *dma_handle = (dma_addr_t) paddr;
+
+#if 0
+/* This probably isn't needed to support EISA cards.
+** ISA cards will certainly only support 24-bit DMA addressing.
+** Not clear if we can, want, or need to support ISA.
+*/
+ if (!dev || *dev->coherent_dma_mask < 0xffffffff)
+ gfp |= GFP_DMA;
+#endif
+ return (void *)vaddr;
+}
+
+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, unsigned long attrs)
+{
+ int order = get_order(size);
+
+ WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 &&
+ boot_cpu_data.cpu_type != pcxl);
+
+ size = 1 << (order + PAGE_SHIFT);
+ unmap_uncached_pages((unsigned long)vaddr, size);
+ pcxl_free_range((unsigned long)vaddr, size);
+
+ free_pages((unsigned long)__va(dma_handle), order);
+}
+
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
+}
+
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
+}