/* * Thunderbolt driver - NHI registers * * Copyright (c) 2014 Andreas Noever */ #ifndef NHI_REGS_H_ #define NHI_REGS_H_ #include enum ring_flags { RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */ RING_FLAG_E2E_FLOW_CONTROL = 1 << 28, RING_FLAG_PCI_NO_SNOOP = 1 << 29, RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */ RING_FLAG_ENABLE = 1 << 31, }; enum ring_desc_flags { RING_DESC_ISOCH = 0x1, /* TX only? */ RING_DESC_COMPLETED = 0x2, /* set by NHI */ RING_DESC_POSTED = 0x4, /* always set this */ RING_DESC_INTERRUPT = 0x8, /* request an interrupt on completion */ }; /** * struct ring_desc - TX/RX ring entry * * For TX set length/eof/sof. * For RX length/eof/sof are set by the NHI. */ struct ring_desc { u64 phys; u32 length:12; u32 eof:4; u32 sof:4; enum ring_desc_flags flags:12; u32 time; /* write zero */ } __packed; /* NHI registers in bar 0 */ /* * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT) * 00: physical pointer to an array of struct ring_desc * 08: ring tail (set by NHI) * 10: ring head (index of first non posted descriptor) * 12: descriptor count */ #define REG_TX_RING_BASE 0x00000 /* * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT) * 00: physical pointer to an array of struct ring_desc * 08: ring head (index of first not posted descriptor) * 10: ring tail (set by NHI) * 12: descriptor count * 14: max frame sizes (anything larger than 0x100 has no effect) */ #define REG_RX_RING_BASE 0x08000 /* * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT) * 00: enum_ring_flags * 04: isoch time stamp ?? (write 0) * ..: unknown */ #define REG_TX_OPTIONS_BASE 0x19800 /* * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT) * 00: enum ring_flags * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to * the corresponding TX hop id. * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings) * ..: unknown */ #define REG_RX_OPTIONS_BASE 0x29800 /* * three bitfields: tx, rx, rx overflow * Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are * cleared on read. New interrupts are fired only after ALL registers have been * read (even those containing only disabled rings). */ #define REG_RING_NOTIFY_BASE 0x37800 #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32) /* * two bitfields: rx, tx * Both bitfields contains one bit for every hop (REG_HOP_COUNT). To * enable/disable interrupts set/clear the corresponding bits. */ #define REG_RING_INTERRUPT_BASE 0x38200 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32) /* The last 11 bits contain the number of hops supported by the NHI port. */ #define REG_HOP_COUNT 0x39640 #endif g
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /tools/perf/Documentation/manpage-suppress-sp.xsl
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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