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Avoid address_space_rw() with a constant is_write argument

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The address_space_rw() function allows either reads or writes
depending on the is_write argument passed to it; this is useful
when the direction of the access is determined programmatically
(as for instance when handling the KVM_EXIT_MMIO exit reason).
Under the hood it just calls either address_space_write() or
address_space_read_full().

We also use it a lot with a constant is_write argument, though,
which has two issues:
 * when reading "address_space_rw(..., 1)" this is less
   immediately clear to the reader as being a write than
   "address_space_write(...)"
 * calling address_space_rw() bypasses the optimization
   in address_space_read() that fast-paths reads of a
   fixed length

This commit was produced with the included Coccinelle script
scripts/coccinelle/exec_rw_const.cocci.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20200218112457.22712-1-peter.maydell@linaro.org>
[PMD: Update macvm_set_cr0() reported by Laurent Vivier]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Peter Maydell 2020-02-18 11:24:57 +00:00 • committed by Philippe Mathieu-Daudé
parent 1ccda935d4
commit 19f7034773
13 changed files with 119 additions and 107 deletions
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70
hw/net/dp8393x.c
View file

@ -275,8 +275,8 @@ static void dp8393x_do_load_cam(dp8393xState *s)
while (s->regs[SONIC_CDC] & 0x1f) {
/* Fill current entry */
address_space_rw(&s->as, dp8393x_cdp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as, dp8393x_cdp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size);
s->cam[index][0] = dp8393x_get(s, width, 1) & 0xff;
s->cam[index][1] = dp8393x_get(s, width, 1) >> 8;
s->cam[index][2] = dp8393x_get(s, width, 2) & 0xff;
@ -293,8 +293,8 @@ static void dp8393x_do_load_cam(dp8393xState *s)
}
/* Read CAM enable */
address_space_rw(&s->as, dp8393x_cdp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as, dp8393x_cdp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size);
s->regs[SONIC_CE] = dp8393x_get(s, width, 0);
DPRINTF("load cam done. cam enable mask 0x%04x\n", s->regs[SONIC_CE]);
@ -311,8 +311,8 @@ static void dp8393x_do_read_rra(dp8393xState *s)
/* Read memory */
width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
size = sizeof(uint16_t) * 4 * width;
address_space_rw(&s->as, dp8393x_rrp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as, dp8393x_rrp(s),
MEMTXATTRS_UNSPECIFIED, s->data, size);
/* Update SONIC registers */
s->regs[SONIC_CRBA0] = dp8393x_get(s, width, 0);
@ -426,8 +426,8 @@ static void dp8393x_do_transmit_packets(dp8393xState *s)
size = sizeof(uint16_t) * 6 * width;
s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA];
DPRINTF("Transmit packet at %08x\n", dp8393x_ttda(s));
address_space_rw(&s->as, dp8393x_ttda(s) + sizeof(uint16_t) * width,
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as, dp8393x_ttda(s) + sizeof(uint16_t) * width,
MEMTXATTRS_UNSPECIFIED, s->data, size);
tx_len = 0;
/* Update registers */
@ -451,18 +451,19 @@ static void dp8393x_do_transmit_packets(dp8393xState *s)
if (tx_len + len > sizeof(s->tx_buffer)) {
len = sizeof(s->tx_buffer) - tx_len;
}
address_space_rw(&s->as, dp8393x_tsa(s),
MEMTXATTRS_UNSPECIFIED,
&s->tx_buffer[tx_len], len, false);
address_space_read(&s->as, dp8393x_tsa(s), MEMTXATTRS_UNSPECIFIED,
&s->tx_buffer[tx_len], len);
tx_len += len;
i++;
if (i != s->regs[SONIC_TFC]) {
/* Read next fragment details */
size = sizeof(uint16_t) * 3 * width;
address_space_rw(&s->as,
dp8393x_ttda(s) + sizeof(uint16_t) * (4 + 3 * i) * width,
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as,
dp8393x_ttda(s)
+ sizeof(uint16_t) * width * (4 + 3 * i),
MEMTXATTRS_UNSPECIFIED, s->data,
size);
s->regs[SONIC_TSA0] = dp8393x_get(s, width, 0);
s->regs[SONIC_TSA1] = dp8393x_get(s, width, 1);
s->regs[SONIC_TFS] = dp8393x_get(s, width, 2);
@ -495,18 +496,18 @@ static void dp8393x_do_transmit_packets(dp8393xState *s)
dp8393x_put(s, width, 0,
s->regs[SONIC_TCR] & 0x0fff); /* status */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as,
dp8393x_ttda(s),
MEMTXATTRS_UNSPECIFIED, s->data, size, true);
address_space_write(&s->as, dp8393x_ttda(s),
MEMTXATTRS_UNSPECIFIED, s->data, size);
if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) {
/* Read footer of packet */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as,
dp8393x_ttda(s) +
sizeof(uint16_t) *
(4 + 3 * s->regs[SONIC_TFC]) * width,
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as,
dp8393x_ttda(s)
+ sizeof(uint16_t) * width
* (4 + 3 * s->regs[SONIC_TFC]),
MEMTXATTRS_UNSPECIFIED, s->data,
size);
s->regs[SONIC_CTDA] = dp8393x_get(s, width, 0) & ~0x1;
if (dp8393x_get(s, width, 0) & 0x1) {
/* EOL detected */
@ -768,8 +769,8 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
/* Are we still in resource exhaustion? */
size = sizeof(uint16_t) * 1 * width;
address = dp8393x_crda(s) + sizeof(uint16_t) * 5 * width;
address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
s->data, size, false);
address_space_read(&s->as, address, MEMTXATTRS_UNSPECIFIED,
s->data, size);
if (dp8393x_get(s, width, 0) & 0x1) {
/* Still EOL ; stop reception */
return -1;
@ -788,10 +789,11 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
/* Put packet into RBA */
DPRINTF("Receive packet at %08x\n", dp8393x_crba(s));
address = dp8393x_crba(s);
address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, buf, rx_len);
address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED,
buf, rx_len);
address += rx_len;
address_space_rw(&s->as, address,
MEMTXATTRS_UNSPECIFIED, &checksum, 4, true);
address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED,
&checksum, 4);
rx_len += 4;
s->regs[SONIC_CRBA1] = address >> 16;
s->regs[SONIC_CRBA0] = address & 0xffff;
@ -819,13 +821,15 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
dp8393x_put(s, width, 3, s->regs[SONIC_TRBA1]); /* pkt_ptr1 */
dp8393x_put(s, width, 4, s->regs[SONIC_RSC]); /* seq_no */
size = sizeof(uint16_t) * 5 * width;
address_space_rw(&s->as, dp8393x_crda(s),
MEMTXATTRS_UNSPECIFIED, s->data, size, true);
address_space_write(&s->as, dp8393x_crda(s),
MEMTXATTRS_UNSPECIFIED,
s->data, size);
/* Move to next descriptor */
size = sizeof(uint16_t) * width;
address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 5 * width,
MEMTXATTRS_UNSPECIFIED, s->data, size, false);
address_space_read(&s->as,
dp8393x_crda(s) + sizeof(uint16_t) * 5 * width,
MEMTXATTRS_UNSPECIFIED, s->data, size);
s->regs[SONIC_LLFA] = dp8393x_get(s, width, 0);
if (s->regs[SONIC_LLFA] & 0x1) {
/* EOL detected */
@ -838,8 +842,8 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
offset += sizeof(uint16_t);
}
s->data[0] = 0;
address_space_rw(&s->as, offset, MEMTXATTRS_UNSPECIFIED,
s->data, sizeof(uint16_t), true);
address_space_write(&s->as, offset, MEMTXATTRS_UNSPECIFIED,
s->data, sizeof(uint16_t));
s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);