From: Arnd Bergmann <arnd@arndb.de>
To: Alex Elder <elder@linaro.org>
Cc: David Miller <davem@davemloft.net>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
syadagir@codeaurora.org, mjavid@codeaurora.org,
evgreen@chromium.org, benchan@google.com, ejcaruso@google.com,
abhishek.esse@gmail.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 09/18] soc: qcom: ipa: GSI transactions
Date: Wed, 15 May 2019 09:34:44 +0200 [thread overview]
Message-ID: <CAK8P3a0eYWN6mMwft5OSu8wQQo=kWh5safGFFNkDCELZJyiMmQ@mail.gmail.com> (raw)
In-Reply-To: <20190512012508.10608-10-elder@linaro.org>
> +static void gsi_trans_tre_fill(struct gsi_tre *dest_tre, dma_addr_t addr,
> + u32 len, bool last_tre, bool bei,
> + enum ipa_cmd_opcode opcode)
> +{
> + struct gsi_tre tre;
> +
> + tre.addr = cpu_to_le64(addr);
> + tre.len_opcode = gsi_tre_len_opcode(opcode, len);
> + tre.reserved = 0;
> + tre.flags = gsi_tre_flags(last_tre, bei, opcode);
> +
> + *dest_tre = tre; /* Write TRE as a single (16-byte) unit */
> +}
Have you checked that the atomic write is actually what happens here,
but looking at the compiler output? You might need to add a 'volatile'
qualifier to the dest_tre argument so the temporary structure doesn't
get optimized away here.
> +/* Cancel a channel's pending transactions */
> +void gsi_channel_trans_cancel_pending(struct gsi_channel *channel)
> +{
> + struct gsi_trans_info *trans_info = &channel->trans_info;
> + u32 evt_ring_id = channel->evt_ring_id;
> + struct gsi *gsi = channel->gsi;
> + struct gsi_evt_ring *evt_ring;
> + struct gsi_trans *trans;
> + unsigned long flags;
> +
> + evt_ring = &gsi->evt_ring[evt_ring_id];
> +
> + spin_lock_irqsave(&evt_ring->ring.spinlock, flags);
> +
> + list_for_each_entry(trans, &trans_info->pending, links)
> + trans->result = -ECANCELED;
> +
> + list_splice_tail_init(&trans_info->pending, &trans_info->complete);
> +
> + spin_unlock_irqrestore(&evt_ring->ring.spinlock, flags);
> +
> + spin_lock_irqsave(&gsi->spinlock, flags);
> +
> + if (gsi->event_enable_bitmap & BIT(evt_ring_id))
> + gsi_event_handle(gsi, evt_ring_id);
> +
> + spin_unlock_irqrestore(&gsi->spinlock, flags);
> +}
That is a lot of irqsave()/irqrestore() operations. Do you actually call
all of these functions from hardirq context?
Arnd
next prev parent reply other threads:[~2019-05-15 7:35 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-12 1:24 [PATCH 00/18] net: introduce Qualcomm IPA driver Alex Elder
2019-05-12 1:24 ` [PATCH 01/18] bitfield.h: add FIELD_MAX() and field_max() Alex Elder
2019-05-12 6:33 ` Kalle Valo
2019-05-12 12:18 ` Alex Elder
2019-05-12 19:30 ` Johannes Berg
2019-05-12 1:24 ` [PATCH 02/18] soc: qcom: create "include/soc/qcom/rmnet.h" Alex Elder
2019-05-12 2:34 ` Joe Perches
2019-05-12 12:15 ` Alex Elder
2019-05-15 6:59 ` Arnd Bergmann
2019-05-15 12:03 ` Alex Elder
2019-05-16 1:09 ` Subash Abhinov Kasiviswanathan
2019-05-17 17:27 ` Alex Elder
2019-05-17 18:08 ` Subash Abhinov Kasiviswanathan
2019-05-19 17:37 ` Alex Elder
2019-05-12 1:24 ` [PATCH 03/18] dt-bindings: soc: qcom: add IPA bindings Alex Elder
2019-05-15 7:03 ` Arnd Bergmann
2019-05-15 12:04 ` Alex Elder
2019-05-15 16:50 ` Rob Herring
2019-05-15 17:05 ` Alex Elder
2019-05-12 1:24 ` [PATCH 04/18] soc: qcom: ipa: main code Alex Elder
2019-05-12 1:24 ` [PATCH 05/18] soc: qcom: ipa: configuration data Alex Elder
2019-05-12 1:24 ` [PATCH 06/18] soc: qcom: ipa: clocking, interrupts, and memory Alex Elder
2019-05-12 1:24 ` [PATCH 07/18] soc: qcom: ipa: GSI headers Alex Elder
2019-05-12 1:24 ` [PATCH 08/18] soc: qcom: ipa: the generic software interface Alex Elder
2019-05-15 7:21 ` Arnd Bergmann
2019-05-15 12:13 ` Alex Elder
2019-05-15 12:40 ` Arnd Bergmann
2019-05-15 10:47 ` Arnd Bergmann
2019-05-15 13:32 ` Alex Elder
2019-05-15 19:37 ` Arnd Bergmann
2019-05-12 1:24 ` [PATCH 09/18] soc: qcom: ipa: GSI transactions Alex Elder
2019-05-15 7:34 ` Arnd Bergmann [this message]
2019-05-15 12:25 ` Alex Elder
2019-05-15 20:50 ` Arnd Bergmann
2019-05-17 18:08 ` Alex Elder
2019-05-17 18:33 ` Arnd Bergmann
2019-05-17 18:44 ` Alex Elder
2019-05-19 17:11 ` Alex Elder
2019-05-20 9:25 ` Arnd Bergmann
2019-05-20 12:50 ` Alex Elder
2019-05-20 14:43 ` Arnd Bergmann
2019-05-20 14:44 ` Alex Elder
2019-05-20 16:34 ` Evan Green
2019-05-20 16:50 ` Alex Elder
2019-05-20 17:36 ` Evan Green
2019-05-12 1:25 ` [PATCH 10/18] soc: qcom: ipa: IPA interface to GSI Alex Elder
2019-05-12 1:25 ` [PATCH 11/18] soc: qcom: ipa: IPA endpoints Alex Elder
2019-05-12 1:25 ` [PATCH 12/18] soc: qcom: ipa: immediate commands Alex Elder
2019-05-15 8:16 ` Arnd Bergmann
2019-05-15 12:35 ` Alex Elder
2019-05-18 0:34 ` Alex Elder
2019-05-20 14:50 ` Arnd Bergmann
2019-05-20 14:55 ` Alex Elder
2019-05-20 17:35 ` Christoph Hellwig
2019-05-12 1:25 ` [PATCH 13/18] soc: qcom: ipa: IPA network device and microcontroller Alex Elder
2019-05-15 8:21 ` Arnd Bergmann
2019-05-15 12:46 ` Alex Elder
2019-05-12 1:25 ` [PATCH 14/18] soc: qcom: ipa: AP/modem communications Alex Elder
2019-05-12 1:25 ` [PATCH 15/18] soc: qcom: ipa: support build of IPA code Alex Elder
2019-05-12 1:25 ` [PATCH 16/18] MAINTAINERS: add entry for the Qualcomm IPA driver Alex Elder
2019-05-12 1:25 ` [PATCH 17/18] arm64: dts: sdm845: add IPA information Alex Elder
2019-05-12 1:25 ` [PATCH 18/18] arm64: defconfig: enable build of IPA code Alex Elder
2019-05-15 8:23 ` Arnd Bergmann
2019-05-15 12:49 ` Alex Elder
2019-05-15 12:37 ` [PATCH 00/18] net: introduce Qualcomm IPA driver Arnd Bergmann
2019-05-15 12:52 ` Alex Elder
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